"Fossies" - the Fresh Open Source Software Archive  

Source code changes of the file "doc/README.md" between
lodash-4.0.0.tar.gz and lodash-4.17.21.tar.gz

About: lodash is a modern JavaScript utility library delivering modularity, performance, & extras. Tagged version.

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README.md  (lodash-4.0.0):README.md  (lodash-4.17.21)
# <a href="https://lodash.com/">lodash</a> <span>v4.0.0</span> # <a href="https://lodash.com/">lodash</a> <span>v4.17.21</span>
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## `Array` ## `Array`
* <a href="#_chunkarray-size0">`_.chunk`</a> * <a href="#_chunkarray-size1">`_.chunk`</a>
* <a href="#_compactarray">`_.compact`</a> * <a href="#_compactarray">`_.compact`</a>
* <a href="#_concatarray-values">`_.concat`</a> * <a href="#_concatarray-values">`_.concat`</a>
* <a href="#_differencearray-values">`_.difference`</a> * <a href="#_differencearray-values">`_.difference`</a>
* <a href="#_differencebyarray-values-iteratee_identity">`_.differenceBy`</a> * <a href="#_differencebyarray-values-iteratee_identity">`_.differenceBy`</a>
* <a href="#_differencewitharray-values-comparator">`_.differenceWith`</a> * <a href="#_differencewitharray-values-comparator">`_.differenceWith`</a>
* <a href="#_droparray-n1">`_.drop`</a> * <a href="#_droparray-n1">`_.drop`</a>
* <a href="#_droprightarray-n1">`_.dropRight`</a> * <a href="#_droprightarray-n1">`_.dropRight`</a>
* <a href="#_droprightwhilearray-predicate_identity">`_.dropRightWhile`</a> * <a href="#_droprightwhilearray-predicate_identity">`_.dropRightWhile`</a>
* <a href="#_dropwhilearray-predicate_identity">`_.dropWhile`</a> * <a href="#_dropwhilearray-predicate_identity">`_.dropWhile`</a>
* <a href="#_fillarray-value-start0-endarraylength">`_.fill`</a> * <a href="#_fillarray-value-start0-endarraylength">`_.fill`</a>
* <a href="#_findindexarray-predicate_identity">`_.findIndex`</a> * <a href="#_findindexarray-predicate_identity-fromindex0">`_.findIndex`</a>
* <a href="#_findlastindexarray-predicate_identity">`_.findLastIndex`</a> * <a href="#_findlastindexarray-predicate_identity-fromindexarraylength-1">`_.fi
ndLastIndex`</a>
* <a href="#_headarray" class="alias">`_.first` -> `head`</a> * <a href="#_headarray" class="alias">`_.first` -> `head`</a>
* <a href="#_flatmaparray-iteratee_identity">`_.flatMap`</a>
* <a href="#_flattenarray">`_.flatten`</a> * <a href="#_flattenarray">`_.flatten`</a>
* <a href="#_flattendeeparray">`_.flattenDeep`</a> * <a href="#_flattendeeparray">`_.flattenDeep`</a>
* <a href="#_flattendeptharray-depth1">`_.flattenDepth`</a>
* <a href="#_frompairspairs">`_.fromPairs`</a> * <a href="#_frompairspairs">`_.fromPairs`</a>
* <a href="#_headarray">`_.head`</a> * <a href="#_headarray">`_.head`</a>
* <a href="#_indexofarray-value-fromindex0">`_.indexOf`</a> * <a href="#_indexofarray-value-fromindex0">`_.indexOf`</a>
* <a href="#_initialarray">`_.initial`</a> * <a href="#_initialarray">`_.initial`</a>
* <a href="#_intersectionarrays">`_.intersection`</a> * <a href="#_intersectionarrays">`_.intersection`</a>
* <a href="#_intersectionbyarrays-iteratee_identity">`_.intersectionBy`</a> * <a href="#_intersectionbyarrays-iteratee_identity">`_.intersectionBy`</a>
* <a href="#_intersectionwitharrays-comparator">`_.intersectionWith`</a> * <a href="#_intersectionwitharrays-comparator">`_.intersectionWith`</a>
* <a href="#_joinarray-separator-">`_.join`</a> * <a href="#_joinarray-separator-">`_.join`</a>
* <a href="#_lastarray">`_.last`</a> * <a href="#_lastarray">`_.last`</a>
* <a href="#_lastindexofarray-value-fromindexarraylength-1">`_.lastIndexOf`</a> * <a href="#_lastindexofarray-value-fromindexarraylength-1">`_.lastIndexOf`</a>
* <a href="#_ntharray-n0">`_.nth`</a>
* <a href="#_pullarray-values">`_.pull`</a> * <a href="#_pullarray-values">`_.pull`</a>
* <a href="#_pullallarray-values">`_.pullAll`</a> * <a href="#_pullallarray-values">`_.pullAll`</a>
* <a href="#_pullallbyarray-values-iteratee_identity">`_.pullAllBy`</a> * <a href="#_pullallbyarray-values-iteratee_identity">`_.pullAllBy`</a>
* <a href="#_pullallwitharray-values-comparator">`_.pullAllWith`</a>
* <a href="#_pullatarray-indexes">`_.pullAt`</a> * <a href="#_pullatarray-indexes">`_.pullAt`</a>
* <a href="#_removearray-predicate_identity">`_.remove`</a> * <a href="#_removearray-predicate_identity">`_.remove`</a>
* <a href="#_reversearray">`_.reverse`</a>
* <a href="#_slicearray-start0-endarraylength">`_.slice`</a> * <a href="#_slicearray-start0-endarraylength">`_.slice`</a>
* <a href="#_sortedindexarray-value">`_.sortedIndex`</a> * <a href="#_sortedindexarray-value">`_.sortedIndex`</a>
* <a href="#_sortedindexbyarray-value-iteratee_identity">`_.sortedIndexBy`</a> * <a href="#_sortedindexbyarray-value-iteratee_identity">`_.sortedIndexBy`</a>
* <a href="#_sortedindexofarray-value">`_.sortedIndexOf`</a> * <a href="#_sortedindexofarray-value">`_.sortedIndexOf`</a>
* <a href="#_sortedlastindexarray-value">`_.sortedLastIndex`</a> * <a href="#_sortedlastindexarray-value">`_.sortedLastIndex`</a>
* <a href="#_sortedlastindexbyarray-value-iteratee_identity">`_.sortedLastIndexB y`</a> * <a href="#_sortedlastindexbyarray-value-iteratee_identity">`_.sortedLastIndexB y`</a>
* <a href="#_sortedlastindexofarray-value">`_.sortedLastIndexOf`</a> * <a href="#_sortedlastindexofarray-value">`_.sortedLastIndexOf`</a>
* <a href="#_sorteduniqarray">`_.sortedUniq`</a> * <a href="#_sorteduniqarray">`_.sortedUniq`</a>
* <a href="#_sorteduniqbyarray-iteratee">`_.sortedUniqBy`</a> * <a href="#_sorteduniqbyarray-iteratee">`_.sortedUniqBy`</a>
* <a href="#_tailarray">`_.tail`</a> * <a href="#_tailarray">`_.tail`</a>
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* <a href="#_uniqbyarray-iteratee_identity">`_.uniqBy`</a> * <a href="#_uniqbyarray-iteratee_identity">`_.uniqBy`</a>
* <a href="#_uniqwitharray-comparator">`_.uniqWith`</a> * <a href="#_uniqwitharray-comparator">`_.uniqWith`</a>
* <a href="#_unziparray">`_.unzip`</a> * <a href="#_unziparray">`_.unzip`</a>
* <a href="#_unzipwitharray-iteratee_identity">`_.unzipWith`</a> * <a href="#_unzipwitharray-iteratee_identity">`_.unzipWith`</a>
* <a href="#_withoutarray-values">`_.without`</a> * <a href="#_withoutarray-values">`_.without`</a>
* <a href="#_xorarrays">`_.xor`</a> * <a href="#_xorarrays">`_.xor`</a>
* <a href="#_xorbyarrays-iteratee_identity">`_.xorBy`</a> * <a href="#_xorbyarrays-iteratee_identity">`_.xorBy`</a>
* <a href="#_xorwitharrays-comparator">`_.xorWith`</a> * <a href="#_xorwitharrays-comparator">`_.xorWith`</a>
* <a href="#_ziparrays">`_.zip`</a> * <a href="#_ziparrays">`_.zip`</a>
* <a href="#_zipobjectprops-values">`_.zipObject`</a> * <a href="#_zipobjectprops-values">`_.zipObject`</a>
* <a href="#_zipobjectdeepprops-values">`_.zipObjectDeep`</a>
* <a href="#_zipwitharrays-iteratee_identity">`_.zipWith`</a> * <a href="#_zipwitharrays-iteratee_identity">`_.zipWith`</a>
* <a href="#_prototypereverse">`_.prototype.reverse`</a>
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## `Collection` ## `Collection`
* <a href="#_countbycollection-iteratee_identity">`_.countBy`</a> * <a href="#_countbycollection-iteratee_identity">`_.countBy`</a>
* <a href="#_foreachcollection-iteratee_identity" class="alias">`_.each` -> `for Each`</a> * <a href="#_foreachcollection-iteratee_identity" class="alias">`_.each` -> `for Each`</a>
* <a href="#_foreachrightcollection-iteratee_identity" class="alias">`_.eachRigh t` -> `forEachRight`</a> * <a href="#_foreachrightcollection-iteratee_identity" class="alias">`_.eachRigh t` -> `forEachRight`</a>
* <a href="#_everycollection-predicate_identity">`_.every`</a> * <a href="#_everycollection-predicate_identity">`_.every`</a>
* <a href="#_filtercollection-predicate_identity">`_.filter`</a> * <a href="#_filtercollection-predicate_identity">`_.filter`</a>
* <a href="#_findcollection-predicate_identity">`_.find`</a> * <a href="#_findcollection-predicate_identity-fromindex0">`_.find`</a>
* <a href="#_findlastcollection-predicate_identity">`_.findLast`</a> * <a href="#_findlastcollection-predicate_identity-fromindexcollectionlength-1">
`_.findLast`</a>
* <a href="#_flatmapcollection-iteratee_identity">`_.flatMap`</a>
* <a href="#_flatmapdeepcollection-iteratee_identity">`_.flatMapDeep`</a>
* <a href="#_flatmapdepthcollection-iteratee_identity-depth1">`_.flatMapDepth`</
a>
* <a href="#_foreachcollection-iteratee_identity">`_.forEach`</a> * <a href="#_foreachcollection-iteratee_identity">`_.forEach`</a>
* <a href="#_foreachrightcollection-iteratee_identity">`_.forEachRight`</a> * <a href="#_foreachrightcollection-iteratee_identity">`_.forEachRight`</a>
* <a href="#_groupbycollection-iteratee_identity">`_.groupBy`</a> * <a href="#_groupbycollection-iteratee_identity">`_.groupBy`</a>
* <a href="#_includescollection-value-fromindex0">`_.includes`</a> * <a href="#_includescollection-value-fromindex0">`_.includes`</a>
* <a href="#_invokemapcollection-path-args">`_.invokeMap`</a> * <a href="#_invokemapcollection-path-args">`_.invokeMap`</a>
* <a href="#_keybycollection-iteratee_identity">`_.keyBy`</a> * <a href="#_keybycollection-iteratee_identity">`_.keyBy`</a>
* <a href="#_mapcollection-iteratee_identity">`_.map`</a> * <a href="#_mapcollection-iteratee_identity">`_.map`</a>
* <a href="#_orderbycollection-iteratees-_identity-orders">`_.orderBy`</a> * <a href="#_orderbycollection-iteratees_identity-orders">`_.orderBy`</a>
* <a href="#_partitioncollection-predicate_identity">`_.partition`</a> * <a href="#_partitioncollection-predicate_identity">`_.partition`</a>
* <a href="#_reducecollection-iteratee_identity-accumulator">`_.reduce`</a> * <a href="#_reducecollection-iteratee_identity-accumulator">`_.reduce`</a>
* <a href="#_reducerightcollection-iteratee_identity-accumulator">`_.reduceRight `</a> * <a href="#_reducerightcollection-iteratee_identity-accumulator">`_.reduceRight `</a>
* <a href="#_rejectcollection-predicate_identity">`_.reject`</a> * <a href="#_rejectcollection-predicate_identity">`_.reject`</a>
* <a href="#_samplecollection">`_.sample`</a> * <a href="#_samplecollection">`_.sample`</a>
* <a href="#_samplesizecollection-n0">`_.sampleSize`</a> * <a href="#_samplesizecollection-n1">`_.sampleSize`</a>
* <a href="#_shufflecollection">`_.shuffle`</a> * <a href="#_shufflecollection">`_.shuffle`</a>
* <a href="#_sizecollection">`_.size`</a> * <a href="#_sizecollection">`_.size`</a>
* <a href="#_somecollection-predicate_identity">`_.some`</a> * <a href="#_somecollection-predicate_identity">`_.some`</a>
* <a href="#_sortbycollection-iteratees-_identity">`_.sortBy`</a> * <a href="#_sortbycollection-iteratees_identity">`_.sortBy`</a>
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
## `Date` ## `Date`
* <a href="#_now">`_.now`</a> * <a href="#_now">`_.now`</a>
<!-- /div --> <!-- /div -->
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* <a href="#_bindkeyobject-key-partials">`_.bindKey`</a> * <a href="#_bindkeyobject-key-partials">`_.bindKey`</a>
* <a href="#_curryfunc-arityfunclength">`_.curry`</a> * <a href="#_curryfunc-arityfunclength">`_.curry`</a>
* <a href="#_curryrightfunc-arityfunclength">`_.curryRight`</a> * <a href="#_curryrightfunc-arityfunclength">`_.curryRight`</a>
* <a href="#_debouncefunc-wait0-options">`_.debounce`</a> * <a href="#_debouncefunc-wait0-options">`_.debounce`</a>
* <a href="#_deferfunc-args">`_.defer`</a> * <a href="#_deferfunc-args">`_.defer`</a>
* <a href="#_delayfunc-wait-args">`_.delay`</a> * <a href="#_delayfunc-wait-args">`_.delay`</a>
* <a href="#_flipfunc">`_.flip`</a> * <a href="#_flipfunc">`_.flip`</a>
* <a href="#_memoizefunc-resolver">`_.memoize`</a> * <a href="#_memoizefunc-resolver">`_.memoize`</a>
* <a href="#_negatepredicate">`_.negate`</a> * <a href="#_negatepredicate">`_.negate`</a>
* <a href="#_oncefunc">`_.once`</a> * <a href="#_oncefunc">`_.once`</a>
* <a href="#_overargsfunc-transforms">`_.overArgs`</a> * <a href="#_overargsfunc-transforms_identity">`_.overArgs`</a>
* <a href="#_partialfunc-partials">`_.partial`</a> * <a href="#_partialfunc-partials">`_.partial`</a>
* <a href="#_partialrightfunc-partials">`_.partialRight`</a> * <a href="#_partialrightfunc-partials">`_.partialRight`</a>
* <a href="#_reargfunc-indexes">`_.rearg`</a> * <a href="#_reargfunc-indexes">`_.rearg`</a>
* <a href="#_restfunc-startfunclength-1">`_.rest`</a> * <a href="#_restfunc-startfunclength-1">`_.rest`</a>
* <a href="#_spreadfunc">`_.spread`</a> * <a href="#_spreadfunc-start0">`_.spread`</a>
* <a href="#_throttlefunc-wait0-options">`_.throttle`</a> * <a href="#_throttlefunc-wait0-options">`_.throttle`</a>
* <a href="#_unaryfunc">`_.unary`</a> * <a href="#_unaryfunc">`_.unary`</a>
* <a href="#_wrapvalue-wrapper">`_.wrap`</a> * <a href="#_wrapvalue-wrapperidentity">`_.wrap`</a>
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
## `Lang` ## `Lang`
* <a href="#_castarrayvalue">`_.castArray`</a>
* <a href="#_clonevalue">`_.clone`</a> * <a href="#_clonevalue">`_.clone`</a>
* <a href="#_clonedeepvalue">`_.cloneDeep`</a> * <a href="#_clonedeepvalue">`_.cloneDeep`</a>
* <a href="#_clonedeepwithvalue-customizer">`_.cloneDeepWith`</a> * <a href="#_clonedeepwithvalue-customizer">`_.cloneDeepWith`</a>
* <a href="#_clonewithvalue-customizer">`_.cloneWith`</a> * <a href="#_clonewithvalue-customizer">`_.cloneWith`</a>
* <a href="#_conformstoobject-source">`_.conformsTo`</a>
* <a href="#_eqvalue-other">`_.eq`</a> * <a href="#_eqvalue-other">`_.eq`</a>
* <a href="#_gtvalue-other">`_.gt`</a> * <a href="#_gtvalue-other">`_.gt`</a>
* <a href="#_gtevalue-other">`_.gte`</a> * <a href="#_gtevalue-other">`_.gte`</a>
* <a href="#_isargumentsvalue">`_.isArguments`</a> * <a href="#_isargumentsvalue">`_.isArguments`</a>
* <a href="#_isarrayvalue">`_.isArray`</a> * <a href="#_isarrayvalue">`_.isArray`</a>
* <a href="#_isarraybuffervalue">`_.isArrayBuffer`</a>
* <a href="#_isarraylikevalue">`_.isArrayLike`</a> * <a href="#_isarraylikevalue">`_.isArrayLike`</a>
* <a href="#_isarraylikeobjectvalue">`_.isArrayLikeObject`</a> * <a href="#_isarraylikeobjectvalue">`_.isArrayLikeObject`</a>
* <a href="#_isbooleanvalue">`_.isBoolean`</a> * <a href="#_isbooleanvalue">`_.isBoolean`</a>
* <a href="#_isbuffervalue">`_.isBuffer`</a>
* <a href="#_isdatevalue">`_.isDate`</a> * <a href="#_isdatevalue">`_.isDate`</a>
* <a href="#_iselementvalue">`_.isElement`</a> * <a href="#_iselementvalue">`_.isElement`</a>
* <a href="#_isemptyvalue">`_.isEmpty`</a> * <a href="#_isemptyvalue">`_.isEmpty`</a>
* <a href="#_isequalvalue-other">`_.isEqual`</a> * <a href="#_isequalvalue-other">`_.isEqual`</a>
* <a href="#_isequalwithvalue-other-customizer">`_.isEqualWith`</a> * <a href="#_isequalwithvalue-other-customizer">`_.isEqualWith`</a>
* <a href="#_iserrorvalue">`_.isError`</a> * <a href="#_iserrorvalue">`_.isError`</a>
* <a href="#_isfinitevalue">`_.isFinite`</a> * <a href="#_isfinitevalue">`_.isFinite`</a>
* <a href="#_isfunctionvalue">`_.isFunction`</a> * <a href="#_isfunctionvalue">`_.isFunction`</a>
* <a href="#_isintegervalue">`_.isInteger`</a> * <a href="#_isintegervalue">`_.isInteger`</a>
* <a href="#_islengthvalue">`_.isLength`</a> * <a href="#_islengthvalue">`_.isLength`</a>
* <a href="#_ismapvalue">`_.isMap`</a>
* <a href="#_ismatchobject-source">`_.isMatch`</a> * <a href="#_ismatchobject-source">`_.isMatch`</a>
* <a href="#_ismatchwithobject-source-customizer">`_.isMatchWith`</a> * <a href="#_ismatchwithobject-source-customizer">`_.isMatchWith`</a>
* <a href="#_isnanvalue">`_.isNaN`</a> * <a href="#_isnanvalue">`_.isNaN`</a>
* <a href="#_isnativevalue">`_.isNative`</a> * <a href="#_isnativevalue">`_.isNative`</a>
* <a href="#_isnilvalue">`_.isNil`</a> * <a href="#_isnilvalue">`_.isNil`</a>
* <a href="#_isnullvalue">`_.isNull`</a> * <a href="#_isnullvalue">`_.isNull`</a>
* <a href="#_isnumbervalue">`_.isNumber`</a> * <a href="#_isnumbervalue">`_.isNumber`</a>
* <a href="#_isobjectvalue">`_.isObject`</a> * <a href="#_isobjectvalue">`_.isObject`</a>
* <a href="#_isobjectlikevalue">`_.isObjectLike`</a> * <a href="#_isobjectlikevalue">`_.isObjectLike`</a>
* <a href="#_isplainobjectvalue">`_.isPlainObject`</a> * <a href="#_isplainobjectvalue">`_.isPlainObject`</a>
* <a href="#_isregexpvalue">`_.isRegExp`</a> * <a href="#_isregexpvalue">`_.isRegExp`</a>
* <a href="#_issafeintegervalue">`_.isSafeInteger`</a> * <a href="#_issafeintegervalue">`_.isSafeInteger`</a>
* <a href="#_issetvalue">`_.isSet`</a>
* <a href="#_isstringvalue">`_.isString`</a> * <a href="#_isstringvalue">`_.isString`</a>
* <a href="#_issymbolvalue">`_.isSymbol`</a> * <a href="#_issymbolvalue">`_.isSymbol`</a>
* <a href="#_istypedarrayvalue">`_.isTypedArray`</a> * <a href="#_istypedarrayvalue">`_.isTypedArray`</a>
* <a href="#_isundefinedvalue">`_.isUndefined`</a> * <a href="#_isundefinedvalue">`_.isUndefined`</a>
* <a href="#_isweakmapvalue">`_.isWeakMap`</a>
* <a href="#_isweaksetvalue">`_.isWeakSet`</a>
* <a href="#_ltvalue-other">`_.lt`</a> * <a href="#_ltvalue-other">`_.lt`</a>
* <a href="#_ltevalue-other">`_.lte`</a> * <a href="#_ltevalue-other">`_.lte`</a>
* <a href="#_toarrayvalue">`_.toArray`</a> * <a href="#_toarrayvalue">`_.toArray`</a>
* <a href="#_tofinitevalue">`_.toFinite`</a>
* <a href="#_tointegervalue">`_.toInteger`</a> * <a href="#_tointegervalue">`_.toInteger`</a>
* <a href="#_tolengthvalue">`_.toLength`</a> * <a href="#_tolengthvalue">`_.toLength`</a>
* <a href="#_tonumbervalue">`_.toNumber`</a> * <a href="#_tonumbervalue">`_.toNumber`</a>
* <a href="#_toplainobjectvalue">`_.toPlainObject`</a> * <a href="#_toplainobjectvalue">`_.toPlainObject`</a>
* <a href="#_tosafeintegervalue">`_.toSafeInteger`</a> * <a href="#_tosafeintegervalue">`_.toSafeInteger`</a>
* <a href="#_tostringvalue">`_.toString`</a> * <a href="#_tostringvalue">`_.toString`</a>
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
## `Math` ## `Math`
* <a href="#_addaugend-addend">`_.add`</a> * <a href="#_addaugend-addend">`_.add`</a>
* <a href="#_ceilnumber-precision0">`_.ceil`</a> * <a href="#_ceilnumber-precision0">`_.ceil`</a>
* <a href="#_dividedividend-divisor">`_.divide`</a>
* <a href="#_floornumber-precision0">`_.floor`</a> * <a href="#_floornumber-precision0">`_.floor`</a>
* <a href="#_maxarray">`_.max`</a> * <a href="#_maxarray">`_.max`</a>
* <a href="#_maxbyarray-iteratee_identity">`_.maxBy`</a> * <a href="#_maxbyarray-iteratee_identity">`_.maxBy`</a>
* <a href="#_meanarray">`_.mean`</a> * <a href="#_meanarray">`_.mean`</a>
* <a href="#_meanbyarray-iteratee_identity">`_.meanBy`</a>
* <a href="#_minarray">`_.min`</a> * <a href="#_minarray">`_.min`</a>
* <a href="#_minbyarray-iteratee_identity">`_.minBy`</a> * <a href="#_minbyarray-iteratee_identity">`_.minBy`</a>
* <a href="#_multiplymultiplier-multiplicand">`_.multiply`</a>
* <a href="#_roundnumber-precision0">`_.round`</a> * <a href="#_roundnumber-precision0">`_.round`</a>
* <a href="#_subtractminuend-subtrahend">`_.subtract`</a> * <a href="#_subtractminuend-subtrahend">`_.subtract`</a>
* <a href="#_sumarray">`_.sum`</a> * <a href="#_sumarray">`_.sum`</a>
* <a href="#_sumbyarray-iteratee_identity">`_.sumBy`</a> * <a href="#_sumbyarray-iteratee_identity">`_.sumBy`</a>
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
## `Number` ## `Number`
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## `Object` ## `Object`
* <a href="#_assignobject-sources">`_.assign`</a> * <a href="#_assignobject-sources">`_.assign`</a>
* <a href="#_assigninobject-sources">`_.assignIn`</a> * <a href="#_assigninobject-sources">`_.assignIn`</a>
* <a href="#_assigninwithobject-sources-customizer">`_.assignInWith`</a> * <a href="#_assigninwithobject-sources-customizer">`_.assignInWith`</a>
* <a href="#_assignwithobject-sources-customizer">`_.assignWith`</a> * <a href="#_assignwithobject-sources-customizer">`_.assignWith`</a>
* <a href="#_atobject-paths">`_.at`</a> * <a href="#_atobject-paths">`_.at`</a>
* <a href="#_createprototype-properties">`_.create`</a> * <a href="#_createprototype-properties">`_.create`</a>
* <a href="#_defaultsobject-sources">`_.defaults`</a> * <a href="#_defaultsobject-sources">`_.defaults`</a>
* <a href="#_defaultsdeepobject-sources">`_.defaultsDeep`</a> * <a href="#_defaultsdeepobject-sources">`_.defaultsDeep`</a>
* <a href="#_topairsobject" class="alias">`_.entries` -> `toPairs`</a>
* <a href="#_topairsinobject" class="alias">`_.entriesIn` -> `toPairsIn`</a>
* <a href="#_assigninobject-sources" class="alias">`_.extend` -> `assignIn`</a> * <a href="#_assigninobject-sources" class="alias">`_.extend` -> `assignIn`</a>
* <a href="#_assigninwithobject-sources-customizer" class="alias">`_.extendWith` -> `assignInWith`</a> * <a href="#_assigninwithobject-sources-customizer" class="alias">`_.extendWith` -> `assignInWith`</a>
* <a href="#_findkeyobject-predicate_identity">`_.findKey`</a> * <a href="#_findkeyobject-predicate_identity">`_.findKey`</a>
* <a href="#_findlastkeyobject-predicate_identity">`_.findLastKey`</a> * <a href="#_findlastkeyobject-predicate_identity">`_.findLastKey`</a>
* <a href="#_forinobject-iteratee_identity">`_.forIn`</a> * <a href="#_forinobject-iteratee_identity">`_.forIn`</a>
* <a href="#_forinrightobject-iteratee_identity">`_.forInRight`</a> * <a href="#_forinrightobject-iteratee_identity">`_.forInRight`</a>
* <a href="#_forownobject-iteratee_identity">`_.forOwn`</a> * <a href="#_forownobject-iteratee_identity">`_.forOwn`</a>
* <a href="#_forownrightobject-iteratee_identity">`_.forOwnRight`</a> * <a href="#_forownrightobject-iteratee_identity">`_.forOwnRight`</a>
* <a href="#_functionsobject">`_.functions`</a> * <a href="#_functionsobject">`_.functions`</a>
* <a href="#_functionsinobject">`_.functionsIn`</a> * <a href="#_functionsinobject">`_.functionsIn`</a>
* <a href="#_getobject-path-defaultvalue">`_.get`</a> * <a href="#_getobject-path-defaultvalue">`_.get`</a>
* <a href="#_hasobject-path">`_.has`</a> * <a href="#_hasobject-path">`_.has`</a>
* <a href="#_hasinobject-path">`_.hasIn`</a> * <a href="#_hasinobject-path">`_.hasIn`</a>
* <a href="#_invertobject-multival">`_.invert`</a> * <a href="#_invertobject">`_.invert`</a>
* <a href="#_invertbyobject-iteratee_identity">`_.invertBy`</a>
* <a href="#_invokeobject-path-args">`_.invoke`</a> * <a href="#_invokeobject-path-args">`_.invoke`</a>
* <a href="#_keysobject">`_.keys`</a> * <a href="#_keysobject">`_.keys`</a>
* <a href="#_keysinobject">`_.keysIn`</a> * <a href="#_keysinobject">`_.keysIn`</a>
* <a href="#_mapkeysobject-iteratee_identity">`_.mapKeys`</a> * <a href="#_mapkeysobject-iteratee_identity">`_.mapKeys`</a>
* <a href="#_mapvaluesobject-iteratee_identity">`_.mapValues`</a> * <a href="#_mapvaluesobject-iteratee_identity">`_.mapValues`</a>
* <a href="#_mergeobject-sources">`_.merge`</a> * <a href="#_mergeobject-sources">`_.merge`</a>
* <a href="#_mergewithobject-sources-customizer">`_.mergeWith`</a> * <a href="#_mergewithobject-sources-customizer">`_.mergeWith`</a>
* <a href="#_omitobject-props">`_.omit`</a> * <a href="#_omitobject-paths">`_.omit`</a>
* <a href="#_omitbyobject-predicate_identity">`_.omitBy`</a> * <a href="#_omitbyobject-predicate_identity">`_.omitBy`</a>
* <a href="#_pickobject-props">`_.pick`</a> * <a href="#_pickobject-paths">`_.pick`</a>
* <a href="#_pickbyobject-predicate_identity">`_.pickBy`</a> * <a href="#_pickbyobject-predicate_identity">`_.pickBy`</a>
* <a href="#_resultobject-path-defaultvalue">`_.result`</a> * <a href="#_resultobject-path-defaultvalue">`_.result`</a>
* <a href="#_setobject-path-value">`_.set`</a> * <a href="#_setobject-path-value">`_.set`</a>
* <a href="#_setwithobject-path-value-customizer">`_.setWith`</a> * <a href="#_setwithobject-path-value-customizer">`_.setWith`</a>
* <a href="#_topairsobject">`_.toPairs`</a> * <a href="#_topairsobject">`_.toPairs`</a>
* <a href="#_topairsinobject">`_.toPairsIn`</a> * <a href="#_topairsinobject">`_.toPairsIn`</a>
* <a href="#_transformobject-iteratee_identity-accumulator">`_.transform`</a> * <a href="#_transformobject-iteratee_identity-accumulator">`_.transform`</a>
* <a href="#_unsetobject-path">`_.unset`</a> * <a href="#_unsetobject-path">`_.unset`</a>
* <a href="#_updateobject-path-updater">`_.update`</a>
* <a href="#_updatewithobject-path-updater-customizer">`_.updateWith`</a>
* <a href="#_valuesobject">`_.values`</a> * <a href="#_valuesobject">`_.values`</a>
* <a href="#_valuesinobject">`_.valuesIn`</a> * <a href="#_valuesinobject">`_.valuesIn`</a>
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
## `Seq` ## `Seq`
* <a href="#_value">`_`</a> * <a href="#_value">`_`</a>
* <a href="#_chainvalue">`_.chain`</a> * <a href="#_chainvalue">`_.chain`</a>
* <a href="#_tapvalue-interceptor">`_.tap`</a> * <a href="#_tapvalue-interceptor">`_.tap`</a>
* <a href="#_thruvalue-interceptor">`_.thru`</a> * <a href="#_thruvalue-interceptor">`_.thru`</a>
* <a href="#_wrapperflatmapiteratee_identity">`_.wrapperFlatMap`</a>
* <a href="#_prototypesymboliterator">`_.prototype[Symbol.iterator]`</a> * <a href="#_prototypesymboliterator">`_.prototype[Symbol.iterator]`</a>
* <a href="#_prototypeatpaths">`_.prototype.at`</a> * <a href="#_prototypeatpaths">`_.prototype.at`</a>
* <a href="#_prototypechain">`_.prototype.chain`</a> * <a href="#_prototypechain">`_.prototype.chain`</a>
* <a href="#_prototypecommit">`_.prototype.commit`</a> * <a href="#_prototypecommit">`_.prototype.commit`</a>
* <a href="#_prototypenext">`_.prototype.next`</a> * <a href="#_prototypenext">`_.prototype.next`</a>
* <a href="#_prototypeplantvalue">`_.prototype.plant`</a> * <a href="#_prototypeplantvalue">`_.prototype.plant`</a>
* <a href="#_prototypereverse">`_.prototype.reverse`</a> * <a href="#_prototypereverse">`_.prototype.reverse`</a>
* <a href="#_prototypevalue" class="alias">`_.prototype.run` -> `value`</a>
* <a href="#_prototypevalue" class="alias">`_.prototype.toJSON` -> `value`</a> * <a href="#_prototypevalue" class="alias">`_.prototype.toJSON` -> `value`</a>
* <a href="#_prototypevalue">`_.prototype.value`</a> * <a href="#_prototypevalue">`_.prototype.value`</a>
* <a href="#_prototypevalue" class="alias">`_.prototype.valueOf` -> `value`</a> * <a href="#_prototypevalue" class="alias">`_.prototype.valueOf` -> `value`</a>
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
## `String` ## `String`
* <a href="#_camelcasestring">`_.camelCase`</a> * <a href="#_camelcasestring">`_.camelCase`</a>
skipping to change at line 305 skipping to change at line 326
* <a href="#_deburrstring">`_.deburr`</a> * <a href="#_deburrstring">`_.deburr`</a>
* <a href="#_endswithstring-target-positionstringlength">`_.endsWith`</a> * <a href="#_endswithstring-target-positionstringlength">`_.endsWith`</a>
* <a href="#_escapestring">`_.escape`</a> * <a href="#_escapestring">`_.escape`</a>
* <a href="#_escaperegexpstring">`_.escapeRegExp`</a> * <a href="#_escaperegexpstring">`_.escapeRegExp`</a>
* <a href="#_kebabcasestring">`_.kebabCase`</a> * <a href="#_kebabcasestring">`_.kebabCase`</a>
* <a href="#_lowercasestring">`_.lowerCase`</a> * <a href="#_lowercasestring">`_.lowerCase`</a>
* <a href="#_lowerfirststring">`_.lowerFirst`</a> * <a href="#_lowerfirststring">`_.lowerFirst`</a>
* <a href="#_padstring-length0-chars">`_.pad`</a> * <a href="#_padstring-length0-chars">`_.pad`</a>
* <a href="#_padendstring-length0-chars">`_.padEnd`</a> * <a href="#_padendstring-length0-chars">`_.padEnd`</a>
* <a href="#_padstartstring-length0-chars">`_.padStart`</a> * <a href="#_padstartstring-length0-chars">`_.padStart`</a>
* <a href="#_parseintstring-radix">`_.parseInt`</a> * <a href="#_parseintstring-radix10">`_.parseInt`</a>
* <a href="#_repeatstring-n0">`_.repeat`</a> * <a href="#_repeatstring-n1">`_.repeat`</a>
* <a href="#_replacestring-pattern-replacement">`_.replace`</a> * <a href="#_replacestring-pattern-replacement">`_.replace`</a>
* <a href="#_snakecasestring">`_.snakeCase`</a> * <a href="#_snakecasestring">`_.snakeCase`</a>
* <a href="#_splitstring-separator-limit">`_.split`</a> * <a href="#_splitstring-separator-limit">`_.split`</a>
* <a href="#_startcasestring">`_.startCase`</a> * <a href="#_startcasestring">`_.startCase`</a>
* <a href="#_startswithstring-target-position0">`_.startsWith`</a> * <a href="#_startswithstring-target-position0">`_.startsWith`</a>
* <a href="#_templatestring-options">`_.template`</a> * <a href="#_templatestring-options">`_.template`</a>
* <a href="#_tolowerstring">`_.toLower`</a> * <a href="#_tolowerstring">`_.toLower`</a>
* <a href="#_toupperstring">`_.toUpper`</a> * <a href="#_toupperstring">`_.toUpper`</a>
* <a href="#_trimstring-charswhitespace">`_.trim`</a> * <a href="#_trimstring-charswhitespace">`_.trim`</a>
* <a href="#_trimendstring-charswhitespace">`_.trimEnd`</a> * <a href="#_trimendstring-charswhitespace">`_.trimEnd`</a>
skipping to change at line 329 skipping to change at line 350
* <a href="#_unescapestring">`_.unescape`</a> * <a href="#_unescapestring">`_.unescape`</a>
* <a href="#_uppercasestring">`_.upperCase`</a> * <a href="#_uppercasestring">`_.upperCase`</a>
* <a href="#_upperfirststring">`_.upperFirst`</a> * <a href="#_upperfirststring">`_.upperFirst`</a>
* <a href="#_wordsstring-pattern">`_.words`</a> * <a href="#_wordsstring-pattern">`_.words`</a>
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
## `Util` ## `Util`
* <a href="#_attemptfunc">`_.attempt`</a> * <a href="#_attemptfunc-args">`_.attempt`</a>
* <a href="#_bindallobject-methodnames">`_.bindAll`</a> * <a href="#_bindallobject-methodnames">`_.bindAll`</a>
* <a href="#_condpairs">`_.cond`</a> * <a href="#_condpairs">`_.cond`</a>
* <a href="#_conformssource">`_.conforms`</a> * <a href="#_conformssource">`_.conforms`</a>
* <a href="#_constantvalue">`_.constant`</a> * <a href="#_constantvalue">`_.constant`</a>
* <a href="#_defaulttovalue-defaultvalue">`_.defaultTo`</a>
* <a href="#_flowfuncs">`_.flow`</a> * <a href="#_flowfuncs">`_.flow`</a>
* <a href="#_flowrightfuncs">`_.flowRight`</a> * <a href="#_flowrightfuncs">`_.flowRight`</a>
* <a href="#_identityvalue">`_.identity`</a> * <a href="#_identityvalue">`_.identity`</a>
* <a href="#_iterateefunc_identity">`_.iteratee`</a> * <a href="#_iterateefunc_identity">`_.iteratee`</a>
* <a href="#_matchessource">`_.matches`</a> * <a href="#_matchessource">`_.matches`</a>
* <a href="#_matchespropertypath-srcvalue">`_.matchesProperty`</a> * <a href="#_matchespropertypath-srcvalue">`_.matchesProperty`</a>
* <a href="#_methodpath-args">`_.method`</a> * <a href="#_methodpath-args">`_.method`</a>
* <a href="#_methodofobject-args">`_.methodOf`</a> * <a href="#_methodofobject-args">`_.methodOf`</a>
* <a href="#_mixinobjectlodash-source-options">`_.mixin`</a> * <a href="#_mixinobjectlodash-source-options">`_.mixin`</a>
* <a href="#_noconflict">`_.noConflict`</a> * <a href="#_noconflict">`_.noConflict`</a>
* <a href="#_noop">`_.noop`</a> * <a href="#_noop">`_.noop`</a>
* <a href="#_nthargn0">`_.nthArg`</a> * <a href="#_nthargn0">`_.nthArg`</a>
* <a href="#_overiteratees">`_.over`</a> * <a href="#_overiteratees_identity">`_.over`</a>
* <a href="#_overeverypredicates">`_.overEvery`</a> * <a href="#_overeverypredicates_identity">`_.overEvery`</a>
* <a href="#_oversomepredicates">`_.overSome`</a> * <a href="#_oversomepredicates_identity">`_.overSome`</a>
* <a href="#_propertypath">`_.property`</a> * <a href="#_propertypath">`_.property`</a>
* <a href="#_propertyofobject">`_.propertyOf`</a> * <a href="#_propertyofobject">`_.propertyOf`</a>
* <a href="#_rangestart0-end-step1">`_.range`</a> * <a href="#_rangestart0-end-step1">`_.range`</a>
* <a href="#_rangerightstart0-end-step1">`_.rangeRight`</a> * <a href="#_rangerightstart0-end-step1">`_.rangeRight`</a>
* <a href="#_runincontextcontextroot">`_.runInContext`</a> * <a href="#_runincontextcontextroot">`_.runInContext`</a>
* <a href="#_stubarray">`_.stubArray`</a>
* <a href="#_stubfalse">`_.stubFalse`</a>
* <a href="#_stubobject">`_.stubObject`</a>
* <a href="#_stubstring">`_.stubString`</a>
* <a href="#_stubtrue">`_.stubTrue`</a>
* <a href="#_timesn-iteratee_identity">`_.times`</a> * <a href="#_timesn-iteratee_identity">`_.times`</a>
* <a href="#_topathvalue">`_.toPath`</a> * <a href="#_topathvalue">`_.toPath`</a>
* <a href="#_uniqueidprefix">`_.uniqueId`</a> * <a href="#_uniqueidprefix">`_.uniqueId`</a>
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
## `Methods`
* <a href="#_templatesettingsimports_">`_.templateSettings.imports._`</a>
* <a href="#stringsizestring">`stringSize`</a>
<!-- /div -->
<!-- div -->
## `Properties` ## `Properties`
* <a href="#_version">`_.VERSION`</a> * <a href="#_version">`_.VERSION`</a>
* <a href="#_templatesettings">`_.templateSettings`</a> * <a href="#_templatesettings">`_.templateSettings`</a>
* <a href="#_templatesettingsescape">`_.templateSettings.escape`</a> * <a href="#_templatesettingsescape">`_.templateSettings.escape`</a>
* <a href="#_templatesettingsevaluate">`_.templateSettings.evaluate`</a> * <a href="#_templatesettingsevaluate">`_.templateSettings.evaluate`</a>
* <a href="#_templatesettingsimports">`_.templateSettings.imports`</a> * <a href="#_templatesettingsimports">`_.templateSettings.imports`</a>
* <a href="#_templatesettingsinterpolate">`_.templateSettings.interpolate`</a> * <a href="#_templatesettingsinterpolate">`_.templateSettings.interpolate`</a>
* <a href="#_templatesettingsvariable">`_.templateSettings.variable`</a> * <a href="#_templatesettingsvariable">`_.templateSettings.variable`</a>
<!-- /div --> <!-- /div -->
<!-- div -->
## `Methods`
* <a href="#_templatesettingsimports_">`_.templateSettings.imports._`</a>
<!-- /div -->
<!-- /div --> <!-- /div -->
<!-- div class="doc-container" --> <!-- div class="doc-container" -->
<!-- div --> <!-- div -->
## `“Array” Methods` ## `“Array” Methods`
<!-- div --> <!-- div -->
### <a id="_chunkarray-size0"></a>`_.chunk(array, [size=0])` <h3 id="_chunkarray-size1"><code>_.chunk(array, [size=1])</code></h3>
<a href="#_chunkarray-size0">#</a> [&#x24C8;](https://github.com/lodash/lodash/b [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L6903 "View i
lob/4.0.0/lodash.js#L5250 "View in source") [&#x24C9;][1] [&#x24C3;](https://www n source") [&#x24C3;](https://www.npmjs.com/package/lodash.chunk "See the npm pa
.npmjs.com/package/lodash.chunk "See the npm package") ckage") [&#x24C9;][1]
Creates an array of elements split into groups the length of `size`. Creates an array of elements split into groups the length of `size`.
If `array` can't be split evenly, the final chunk will be the remaining If `array` can't be split evenly, the final chunk will be the remaining
elements. elements.
#### Since
3.0.0
#### Arguments #### Arguments
1. `array` *(Array)*: The array to process. 1. `array` *(Array)*: The array to process.
2. `[size=0]` *(number)*: The length of each chunk. 2. `[size=1]` *(number)*: The length of each chunk
#### Returns #### Returns
*(Array)*: Returns the new array containing chunks. *(Array)*: Returns the new array of chunks.
#### Example #### Example
```js ```js
_.chunk(['a', 'b', 'c', 'd'], 2); _.chunk(['a', 'b', 'c', 'd'], 2);
// => [['a', 'b'], ['c', 'd']] // => [['a', 'b'], ['c', 'd']]
_.chunk(['a', 'b', 'c', 'd'], 3); _.chunk(['a', 'b', 'c', 'd'], 3);
// => [['a', 'b', 'c'], ['d']] // => [['a', 'b', 'c'], ['d']]
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_compactarray"></a>`_.compact(array)` <h3 id="_compactarray"><code>_.compact(array)</code></h3>
<a href="#_compactarray">#</a> [&#x24C8;](https://github.com/lodash/lodash/blob/ [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L6938 "View i
4.0.0/lodash.js#L5281 "View in source") [&#x24C9;][1] [&#x24C3;](https://www.npm n source") [&#x24C3;](https://www.npmjs.com/package/lodash.compact "See the npm
js.com/package/lodash.compact "See the npm package") package") [&#x24C9;][1]
Creates an array with all falsey values removed. The values `false`, `null`, Creates an array with all falsey values removed. The values `false`, `null`,
`0`, `""`, `undefined`, and `NaN` are falsey. `0`, `""`, `undefined`, and `NaN` are falsey.
#### Since
0.1.0
#### Arguments #### Arguments
1. `array` *(Array)*: The array to compact. 1. `array` *(Array)*: The array to compact.
#### Returns #### Returns
*(Array)*: Returns the new array of filtered values. *(Array)*: Returns the new array of filtered values.
#### Example #### Example
```js ```js
_.compact([0, 1, false, 2, '', 3]); _.compact([0, 1, false, 2, '', 3]);
// => [1, 2, 3] // => [1, 2, 3]
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_concatarray-values"></a>`_.concat(array, [values])` <h3 id="_concatarray-values"><code>_.concat(array, [values])</code></h3>
<a href="#_concatarray-values">#</a> [&#x24C8;](https://github.com/lodash/lodash [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L6975 "View i
/blob/4.0.0/lodash.js#L5317 "View in source") [&#x24C9;][1] [&#x24C3;](https://w n source") [&#x24C3;](https://www.npmjs.com/package/lodash.concat "See the npm p
ww.npmjs.com/package/lodash.concat "See the npm package") ackage") [&#x24C9;][1]
Creates a new array concatenating `array` with any additional arrays Creates a new array concatenating `array` with any additional arrays
and/or values. and/or values.
#### Since
4.0.0
#### Arguments #### Arguments
1. `array` *(Array)*: The array to concatenate. 1. `array` *(Array)*: The array to concatenate.
2. `[values]` *(...&#42;)*: The values to concatenate. 2. `[values]` *(...&#42;)*: The values to concatenate.
#### Returns #### Returns
*(Array)*: Returns the new concatenated array. *(Array)*: Returns the new concatenated array.
#### Example #### Example
```js ```js
var array = [1]; var array = [1];
var other = _.concat(array, 2, [3], [[4]]); var other = _.concat(array, 2, [3], [[4]]);
console.log(other); console.log(other);
// => [1, 2, 3, [4]] // => [1, 2, 3, [4]]
console.log(array); console.log(array);
// => [1] // => [1]
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_differencearray-values"></a>`_.difference(array, [values])` <h3 id="_differencearray-values"><code>_.difference(array, [values])</code></h3>
<a href="#_differencearray-values">#</a> [&#x24C8;](https://github.com/lodash/lo [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L7011 "View i
dash/blob/4.0.0/lodash.js#L5338 "View in source") [&#x24C9;][1] [&#x24C3;](https n source") [&#x24C3;](https://www.npmjs.com/package/lodash.difference "See the n
://www.npmjs.com/package/lodash.difference "See the npm package") pm package") [&#x24C9;][1]
Creates an array of unique `array` values not included in the other Creates an array of `array` values not included in the other given arrays
provided arrays using [`SameValueZero`](http://ecma-international.org/ecma-262/6 using [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevalu
.0/#sec-samevaluezero) ezero)
for equality comparisons. for equality comparisons. The order and references of result values are
determined by the first array.
<br>
<br>
**Note:** Unlike `_.pullAll`, this method returns a new array.
#### Since
0.1.0
#### Arguments #### Arguments
1. `array` *(Array)*: The array to inspect. 1. `array` *(Array)*: The array to inspect.
2. `[values]` *(...Array)*: The values to exclude. 2. `[values]` *(...Array)*: The values to exclude.
#### Returns #### Returns
*(Array)*: Returns the new array of filtered values. *(Array)*: Returns the new array of filtered values.
#### Example #### Example
```js ```js
_.difference([3, 2, 1], [4, 2]); _.difference([2, 1], [2, 3]);
// => [3, 1] // => [1]
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_differencebyarray-values-iteratee_identity"></a>`_.differenceBy(arra <h3 id="_differencebyarray-values-iteratee_identity"><code>_.differenceBy(array,
y, [values], [iteratee=_.identity])` [values], [iteratee=_.identity])</code></h3>
<a href="#_differencebyarray-values-iteratee_identity">#</a> [&#x24C8;](https:// [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L7043 "View i
github.com/lodash/lodash/blob/4.0.0/lodash.js#L5365 "View in source") [&#x24C9;] n source") [&#x24C3;](https://www.npmjs.com/package/lodash.differenceby "See the
[1] [&#x24C3;](https://www.npmjs.com/package/lodash.differenceby "See the npm pa npm package") [&#x24C9;][1]
ckage")
This method is like `_.difference` except that it accepts `iteratee` which This method is like `_.difference` except that it accepts `iteratee` which
is invoked for each element of `array` and `values` to generate the criterion is invoked for each element of `array` and `values` to generate the criterion
by which uniqueness is computed. The iteratee is invoked with one argument: (val by which they're compared. The order and references of result values are
ue). determined by the first array. The iteratee is invoked with one argument:<br>
*(value)*.
<br>
<br>
**Note:** Unlike `_.pullAllBy`, this method returns a new array.
#### Since
4.0.0
#### Arguments #### Arguments
1. `array` *(Array)*: The array to inspect. 1. `array` *(Array)*: The array to inspect.
2. `[values]` *(...Array)*: The values to exclude. 2. `[values]` *(...Array)*: The values to exclude.
3. `[iteratee=_.identity]` *(Function|Object|string)*: The iteratee invoked per element. 3. `[iteratee=_.identity]` *(Function)*: The iteratee invoked per element.
#### Returns #### Returns
*(Array)*: Returns the new array of filtered values. *(Array)*: Returns the new array of filtered values.
#### Example #### Example
```js ```js
_.differenceBy([3.1, 2.2, 1.3], [4.4, 2.5], Math.floor); _.differenceBy([2.1, 1.2], [2.3, 3.4], Math.floor);
// => [3.1, 1.3] // => [1.2]
// using the `_.property` iteratee shorthand // The `_.property` iteratee shorthand.
_.differenceBy([{ 'x': 2 }, { 'x': 1 }], [{ 'x': 1 }], 'x'); _.differenceBy([{ 'x': 2 }, { 'x': 1 }], [{ 'x': 1 }], 'x');
// => [{ 'x': 2 }] // => [{ 'x': 2 }]
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_differencewitharray-values-comparator"></a>`_.differenceWith(array, <h3 id="_differencewitharray-values-comparator"><code>_.differenceWith(array, [v
[values], [comparator])` alues], [comparator])</code></h3>
<a href="#_differencewitharray-values-comparator">#</a> [&#x24C8;](https://githu [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L7076 "View i
b.com/lodash/lodash/blob/4.0.0/lodash.js#L5394 "View in source") [&#x24C9;][1] [ n source") [&#x24C3;](https://www.npmjs.com/package/lodash.differencewith "See t
&#x24C3;](https://www.npmjs.com/package/lodash.differencewith "See the npm packa he npm package") [&#x24C9;][1]
ge")
This method is like `_.difference` except that it accepts `comparator` This method is like `_.difference` except that it accepts `comparator`
which is invoked to compare elements of `array` to `values`. The comparator which is invoked to compare elements of `array` to `values`. The order and
is invoked with two arguments: (arrVal, othVal). references of result values are determined by the first array. The comparator
is invoked with two arguments: *(arrVal, othVal)*.
<br>
<br>
**Note:** Unlike `_.pullAllWith`, this method returns a new array.
#### Since
4.0.0
#### Arguments #### Arguments
1. `array` *(Array)*: The array to inspect. 1. `array` *(Array)*: The array to inspect.
2. `[values]` *(...Array)*: The values to exclude. 2. `[values]` *(...Array)*: The values to exclude.
3. `[comparator]` *(Function)*: The comparator invoked per element. 3. `[comparator]` *(Function)*: The comparator invoked per element.
#### Returns #### Returns
*(Array)*: Returns the new array of filtered values. *(Array)*: Returns the new array of filtered values.
#### Example #### Example
```js ```js
var objects = [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }]; var objects = [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }];
_.differenceWith(objects, [{ 'x': 1, 'y': 2 }], _.isEqual); _.differenceWith(objects, [{ 'x': 1, 'y': 2 }], _.isEqual);
// => [{ 'x': 2, 'y': 1 }] // => [{ 'x': 2, 'y': 1 }]
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_droparray-n1"></a>`_.drop(array, [n=1])` <h3 id="_droparray-n1"><code>_.drop(array, [n=1])</code></h3>
<a href="#_droparray-n1">#</a> [&#x24C8;](https://github.com/lodash/lodash/blob/ [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L7111 "View i
4.0.0/lodash.js#L5428 "View in source") [&#x24C9;][1] [&#x24C3;](https://www.npm n source") [&#x24C3;](https://www.npmjs.com/package/lodash.drop "See the npm pac
js.com/package/lodash.drop "See the npm package") kage") [&#x24C9;][1]
Creates a slice of `array` with `n` elements dropped from the beginning. Creates a slice of `array` with `n` elements dropped from the beginning.
#### Since
0.5.0
#### Arguments #### Arguments
1. `array` *(Array)*: The array to query. 1. `array` *(Array)*: The array to query.
2. `[n=1]` *(number)*: The number of elements to drop. 2. `[n=1]` *(number)*: The number of elements to drop.
#### Returns #### Returns
*(Array)*: Returns the slice of `array`. *(Array)*: Returns the slice of `array`.
#### Example #### Example
```js ```js
_.drop([1, 2, 3]); _.drop([1, 2, 3]);
// => [2, 3] // => [2, 3]
_.drop([1, 2, 3], 2); _.drop([1, 2, 3], 2);
// => [3] // => [3]
_.drop([1, 2, 3], 5); _.drop([1, 2, 3], 5);
// => [] // => []
_.drop([1, 2, 3], 0); _.drop([1, 2, 3], 0);
// => [1, 2, 3] // => [1, 2, 3]
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_droprightarray-n1"></a>`_.dropRight(array, [n=1])` <h3 id="_droprightarray-n1"><code>_.dropRight(array, [n=1])</code></h3>
<a href="#_droprightarray-n1">#</a> [&#x24C8;](https://github.com/lodash/lodash/ [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L7145 "View i
blob/4.0.0/lodash.js#L5461 "View in source") [&#x24C9;][1] [&#x24C3;](https://ww n source") [&#x24C3;](https://www.npmjs.com/package/lodash.dropright "See the np
w.npmjs.com/package/lodash.dropright "See the npm package") m package") [&#x24C9;][1]
Creates a slice of `array` with `n` elements dropped from the end. Creates a slice of `array` with `n` elements dropped from the end.
#### Since
3.0.0
#### Arguments #### Arguments
1. `array` *(Array)*: The array to query. 1. `array` *(Array)*: The array to query.
2. `[n=1]` *(number)*: The number of elements to drop. 2. `[n=1]` *(number)*: The number of elements to drop.
#### Returns #### Returns
*(Array)*: Returns the slice of `array`. *(Array)*: Returns the slice of `array`.
#### Example #### Example
```js ```js
_.dropRight([1, 2, 3]); _.dropRight([1, 2, 3]);
// => [1, 2] // => [1, 2]
_.dropRight([1, 2, 3], 2); _.dropRight([1, 2, 3], 2);
// => [1] // => [1]
_.dropRight([1, 2, 3], 5); _.dropRight([1, 2, 3], 5);
// => [] // => []
_.dropRight([1, 2, 3], 0); _.dropRight([1, 2, 3], 0);
// => [1, 2, 3] // => [1, 2, 3]
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_droprightwhilearray-predicate_identity"></a>`_.dropRightWhile(array, <h3 id="_droprightwhilearray-predicate_identity"><code>_.dropRightWhile(array, [
[predicate=_.identity])` predicate=_.identity])</code></h3>
<a href="#_droprightwhilearray-predicate_identity">#</a> [&#x24C8;](https://gith [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L7190 "View i
ub.com/lodash/lodash/blob/4.0.0/lodash.js#L5505 "View in source") [&#x24C9;][1] n source") [&#x24C3;](https://www.npmjs.com/package/lodash.droprightwhile "See t
[&#x24C3;](https://www.npmjs.com/package/lodash.droprightwhile "See the npm pack he npm package") [&#x24C9;][1]
age")
Creates a slice of `array` excluding elements dropped from the end. Creates a slice of `array` excluding elements dropped from the end.
Elements are dropped until `predicate` returns falsey. The predicate is Elements are dropped until `predicate` returns falsey. The predicate is
invoked with three arguments: (value, index, array). invoked with three arguments: *(value, index, array)*.
#### Since
3.0.0
#### Arguments #### Arguments
1. `array` *(Array)*: The array to query. 1. `array` *(Array)*: The array to query.
2. `[predicate=_.identity]` *(Function|Object|string)*: The function invoked per iteration. 2. `[predicate=_.identity]` *(Function)*: The function invoked per iteration.
#### Returns #### Returns
*(Array)*: Returns the slice of `array`. *(Array)*: Returns the slice of `array`.
#### Example #### Example
```js ```js
var users = [ var users = [
{ 'user': 'barney', 'active': true }, { 'user': 'barney', 'active': true },
{ 'user': 'fred', 'active': false }, { 'user': 'fred', 'active': false },
{ 'user': 'pebbles', 'active': false } { 'user': 'pebbles', 'active': false }
]; ];
_.dropRightWhile(users, function(o) { return !o.active; }); _.dropRightWhile(users, function(o) { return !o.active; });
// => objects for ['barney'] // => objects for ['barney']
// using the `_.matches` iteratee shorthand // The `_.matches` iteratee shorthand.
_.dropRightWhile(users, { 'user': 'pebbles', 'active': false }); _.dropRightWhile(users, { 'user': 'pebbles', 'active': false });
// => objects for ['barney', 'fred'] // => objects for ['barney', 'fred']
// using the `_.matchesProperty` iteratee shorthand // The `_.matchesProperty` iteratee shorthand.
_.dropRightWhile(users, ['active', false]); _.dropRightWhile(users, ['active', false]);
// => objects for ['barney'] // => objects for ['barney']
// using the `_.property` iteratee shorthand // The `_.property` iteratee shorthand.
_.dropRightWhile(users, 'active'); _.dropRightWhile(users, 'active');
// => objects for ['barney', 'fred', 'pebbles'] // => objects for ['barney', 'fred', 'pebbles']
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_dropwhilearray-predicate_identity"></a>`_.dropWhile(array, [predicat <h3 id="_dropwhilearray-predicate_identity"><code>_.dropWhile(array, [predicate=
e=_.identity])` _.identity])</code></h3>
<a href="#_dropwhilearray-predicate_identity">#</a> [&#x24C8;](https://github.co [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L7231 "View i
m/lodash/lodash/blob/4.0.0/lodash.js#L5545 "View in source") [&#x24C9;][1] [&#x2 n source") [&#x24C3;](https://www.npmjs.com/package/lodash.dropwhile "See the np
4C3;](https://www.npmjs.com/package/lodash.dropwhile "See the npm package") m package") [&#x24C9;][1]
Creates a slice of `array` excluding elements dropped from the beginning. Creates a slice of `array` excluding elements dropped from the beginning.
Elements are dropped until `predicate` returns falsey. The predicate is Elements are dropped until `predicate` returns falsey. The predicate is
invoked with three arguments: (value, index, array). invoked with three arguments: *(value, index, array)*.
#### Since
3.0.0
#### Arguments #### Arguments
1. `array` *(Array)*: The array to query. 1. `array` *(Array)*: The array to query.
2. `[predicate=_.identity]` *(Function|Object|string)*: The function invoked per iteration. 2. `[predicate=_.identity]` *(Function)*: The function invoked per iteration.
#### Returns #### Returns
*(Array)*: Returns the slice of `array`. *(Array)*: Returns the slice of `array`.
#### Example #### Example
```js ```js
var users = [ var users = [
{ 'user': 'barney', 'active': false }, { 'user': 'barney', 'active': false },
{ 'user': 'fred', 'active': false }, { 'user': 'fred', 'active': false },
{ 'user': 'pebbles', 'active': true } { 'user': 'pebbles', 'active': true }
]; ];
_.dropWhile(users, function(o) { return !o.active; }); _.dropWhile(users, function(o) { return !o.active; });
// => objects for ['pebbles'] // => objects for ['pebbles']
// using the `_.matches` iteratee shorthand // The `_.matches` iteratee shorthand.
_.dropWhile(users, { 'user': 'barney', 'active': false }); _.dropWhile(users, { 'user': 'barney', 'active': false });
// => objects for ['fred', 'pebbles'] // => objects for ['fred', 'pebbles']
// using the `_.matchesProperty` iteratee shorthand // The `_.matchesProperty` iteratee shorthand.
_.dropWhile(users, ['active', false]); _.dropWhile(users, ['active', false]);
// => objects for ['pebbles'] // => objects for ['pebbles']
// using the `_.property` iteratee shorthand // The `_.property` iteratee shorthand.
_.dropWhile(users, 'active'); _.dropWhile(users, 'active');
// => objects for ['barney', 'fred', 'pebbles'] // => objects for ['barney', 'fred', 'pebbles']
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_fillarray-value-start0-endarraylength"></a>`_.fill(array, value, [st <h3 id="_fillarray-value-start0-endarraylength"><code>_.fill(array, value, [star
art=0], [end=array.length])` t=0], [end=array.length])</code></h3>
<a href="#_fillarray-value-start0-endarraylength">#</a> [&#x24C8;](https://githu [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L7266 "View i
b.com/lodash/lodash/blob/4.0.0/lodash.js#L5579 "View in source") [&#x24C9;][1] [ n source") [&#x24C3;](https://www.npmjs.com/package/lodash.fill "See the npm pac
&#x24C3;](https://www.npmjs.com/package/lodash.fill "See the npm package") kage") [&#x24C9;][1]
Fills elements of `array` with `value` from `start` up to, but not Fills elements of `array` with `value` from `start` up to, but not
including, `end`. including, `end`.
<br> <br>
<br> <br>
**Note:** This method mutates `array`. **Note:** This method mutates `array`.
#### Since
3.2.0
#### Arguments #### Arguments
1. `array` *(Array)*: The array to fill. 1. `array` *(Array)*: The array to fill.
2. `value` *(&#42;)*: The value to fill `array` with. 2. `value` *(&#42;)*: The value to fill `array` with.
3. `[start=0]` *(number)*: The start position. 3. `[start=0]` *(number)*: The start position.
4. `[end=array.length]` *(number)*: The end position. 4. `[end=array.length]` *(number)*: The end position.
#### Returns #### Returns
*(Array)*: Returns `array`. *(Array)*: Returns `array`.
#### Example #### Example
```js ```js
var array = [1, 2, 3]; var array = [1, 2, 3];
_.fill(array, 'a'); _.fill(array, 'a');
console.log(array); console.log(array);
// => ['a', 'a', 'a'] // => ['a', 'a', 'a']
_.fill(Array(3), 2); _.fill(Array(3), 2);
// => [2, 2, 2] // => [2, 2, 2]
_.fill([4, 6, 8, 10], '*', 1, 3); _.fill([4, 6, 8, 10], '*', 1, 3);
// => [4, '*', '*', 10] // => [4, '*', '*', 10]
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_findindexarray-predicate_identity"></a>`_.findIndex(array, [predicat <h3 id="_findindexarray-predicate_identity-fromindex0"><code>_.findIndex(array,
e=_.identity])` [predicate=_.identity], [fromIndex=0])</code></h3>
<a href="#_findindexarray-predicate_identity">#</a> [&#x24C8;](https://github.co [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L7313 "View i
m/lodash/lodash/blob/4.0.0/lodash.js#L5624 "View in source") [&#x24C9;][1] [&#x2 n source") [&#x24C3;](https://www.npmjs.com/package/lodash.findindex "See the np
4C3;](https://www.npmjs.com/package/lodash.findindex "See the npm package") m package") [&#x24C9;][1]
This method is like `_.find` except that it returns the index of the first This method is like `_.find` except that it returns the index of the first
element `predicate` returns truthy for instead of the element itself. element `predicate` returns truthy for instead of the element itself.
#### Since
1.1.0
#### Arguments #### Arguments
1. `array` *(Array)*: The array to search. 1. `array` *(Array)*: The array to inspect.
2. `[predicate=_.identity]` *(Function|Object|string)*: The function invoked per 2. `[predicate=_.identity]` *(Function)*: The function invoked per iteration.
iteration. 3. `[fromIndex=0]` *(number)*: The index to search from.
#### Returns #### Returns
*(number)*: Returns the index of the found element, else `-1`. *(number)*: Returns the index of the found element, else `-1`.
#### Example #### Example
```js ```js
var users = [ var users = [
{ 'user': 'barney', 'active': false }, { 'user': 'barney', 'active': false },
{ 'user': 'fred', 'active': false }, { 'user': 'fred', 'active': false },
{ 'user': 'pebbles', 'active': true } { 'user': 'pebbles', 'active': true }
]; ];
_.findIndex(users, function(o) { return o.user == 'barney'; }); _.findIndex(users, function(o) { return o.user == 'barney'; });
// => 0 // => 0
// using the `_.matches` iteratee shorthand // The `_.matches` iteratee shorthand.
_.findIndex(users, { 'user': 'fred', 'active': false }); _.findIndex(users, { 'user': 'fred', 'active': false });
// => 1 // => 1
// using the `_.matchesProperty` iteratee shorthand // The `_.matchesProperty` iteratee shorthand.
_.findIndex(users, ['active', false]); _.findIndex(users, ['active', false]);
// => 0 // => 0
// using the `_.property` iteratee shorthand // The `_.property` iteratee shorthand.
_.findIndex(users, 'active'); _.findIndex(users, 'active');
// => 2 // => 2
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_findlastindexarray-predicate_identity"></a>`_.findLastIndex(array, [ <h3 id="_findlastindexarray-predicate_identity-fromindexarraylength-1"><code>_.f
predicate=_.identity])` indLastIndex(array, [predicate=_.identity], [fromIndex=array.length-1])</code></
<a href="#_findlastindexarray-predicate_identity">#</a> [&#x24C8;](https://githu h3>
b.com/lodash/lodash/blob/4.0.0/lodash.js#L5663 "View in source") [&#x24C9;][1] [ [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L7360 "View i
&#x24C3;](https://www.npmjs.com/package/lodash.findlastindex "See the npm packag n source") [&#x24C3;](https://www.npmjs.com/package/lodash.findlastindex "See th
e") e npm package") [&#x24C9;][1]
This method is like `_.findIndex` except that it iterates over elements This method is like `_.findIndex` except that it iterates over elements
of `collection` from right to left. of `collection` from right to left.
#### Since
2.0.0
#### Arguments #### Arguments
1. `array` *(Array)*: The array to search. 1. `array` *(Array)*: The array to inspect.
2. `[predicate=_.identity]` *(Function|Object|string)*: The function invoked per 2. `[predicate=_.identity]` *(Function)*: The function invoked per iteration.
iteration. 3. `[fromIndex=array.length-1]` *(number)*: The index to search from.
#### Returns #### Returns
*(number)*: Returns the index of the found element, else `-1`. *(number)*: Returns the index of the found element, else `-1`.
#### Example #### Example
```js ```js
var users = [ var users = [
{ 'user': 'barney', 'active': true }, { 'user': 'barney', 'active': true },
{ 'user': 'fred', 'active': false }, { 'user': 'fred', 'active': false },
{ 'user': 'pebbles', 'active': false } { 'user': 'pebbles', 'active': false }
]; ];
_.findLastIndex(users, function(o) { return o.user == 'pebbles'; }); _.findLastIndex(users, function(o) { return o.user == 'pebbles'; });
// => 2 // => 2
// using the `_.matches` iteratee shorthand // The `_.matches` iteratee shorthand.
_.findLastIndex(users, { 'user': 'barney', 'active': true }); _.findLastIndex(users, { 'user': 'barney', 'active': true });
// => 0 // => 0
// using the `_.matchesProperty` iteratee shorthand // The `_.matchesProperty` iteratee shorthand.
_.findLastIndex(users, ['active', false]); _.findLastIndex(users, ['active', false]);
// => 2 // => 2
// using the `_.property` iteratee shorthand // The `_.property` iteratee shorthand.
_.findLastIndex(users, 'active'); _.findLastIndex(users, 'active');
// => 0 // => 0
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_flatmaparray-iteratee_identity"></a>`_.flatMap(array, [iteratee=_.id <h3 id="_flattenarray"><code>_.flatten(array)</code></h3>
entity])` [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L7389 "View i
<a href="#_flatmaparray-iteratee_identity">#</a> [&#x24C8;](https://github.com/l n source") [&#x24C3;](https://www.npmjs.com/package/lodash.flatten "See the npm
odash/lodash/blob/4.0.0/lodash.js#L5689 "View in source") [&#x24C9;][1] [&#x24C3 package") [&#x24C9;][1]
;](https://www.npmjs.com/package/lodash.flatmap "See the npm package")
Creates an array of flattened values by running each element in `array` Flattens `array` a single level deep.
through `iteratee` and concating its result to the other mapped values.
The iteratee is invoked with three arguments: (value, index|key, array). #### Since
0.1.0
#### Arguments #### Arguments
1. `array` *(Array)*: The array to iterate over. 1. `array` *(Array)*: The array to flatten.
2. `[iteratee=_.identity]` *(Function|Object|string)*: The function invoked per
iteration.
#### Returns #### Returns
*(Array)*: Returns the new array. *(Array)*: Returns the new flattened array.
#### Example #### Example
```js ```js
function duplicate(n) { _.flatten([1, [2, [3, [4]], 5]]);
return [n, n]; // => [1, 2, [3, [4]], 5]
}
_.flatMap([1, 2], duplicate);
// => [1, 1, 2, 2]
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_flattenarray"></a>`_.flatten(array)` <h3 id="_flattendeeparray"><code>_.flattenDeep(array)</code></h3>
<a href="#_flattenarray">#</a> [&#x24C8;](https://github.com/lodash/lodash/blob/ [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L7408 "View i
4.0.0/lodash.js#L5707 "View in source") [&#x24C9;][1] [&#x24C3;](https://www.npm n source") [&#x24C3;](https://www.npmjs.com/package/lodash.flattendeep "See the
js.com/package/lodash.flatten "See the npm package") npm package") [&#x24C9;][1]
Flattens `array` a single level. Recursively flattens `array`.
#### Since
3.0.0
#### Arguments #### Arguments
1. `array` *(Array)*: The array to flatten. 1. `array` *(Array)*: The array to flatten.
#### Returns #### Returns
*(Array)*: Returns the new flattened array. *(Array)*: Returns the new flattened array.
#### Example #### Example
```js ```js
_.flatten([1, [2, 3, [4]]]); _.flattenDeep([1, [2, [3, [4]], 5]]);
// => [1, 2, 3, [4]] // => [1, 2, 3, 4, 5]
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_flattendeeparray"></a>`_.flattenDeep(array)` <h3 id="_flattendeptharray-depth1"><code>_.flattenDepth(array, [depth=1])</code>
<a href="#_flattendeeparray">#</a> [&#x24C8;](https://github.com/lodash/lodash/b </h3>
lob/4.0.0/lodash.js#L5725 "View in source") [&#x24C9;][1] [&#x24C3;](https://www [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L7433 "View i
.npmjs.com/package/lodash.flattendeep "See the npm package") n source") [&#x24C3;](https://www.npmjs.com/package/lodash.flattendepth "See the
npm package") [&#x24C9;][1]
This method is like `_.flatten` except that it recursively flattens `array`. Recursively flatten `array` up to `depth` times.
#### Since
4.4.0
#### Arguments #### Arguments
1. `array` *(Array)*: The array to recursively flatten. 1. `array` *(Array)*: The array to flatten.
2. `[depth=1]` *(number)*: The maximum recursion depth.
#### Returns #### Returns
*(Array)*: Returns the new flattened array. *(Array)*: Returns the new flattened array.
#### Example #### Example
```js ```js
_.flattenDeep([1, [2, 3, [4]]]); var array = [1, [2, [3, [4]], 5]];
// => [1, 2, 3, 4]
_.flattenDepth(array, 1);
// => [1, 2, [3, [4]], 5]
_.flattenDepth(array, 2);
// => [1, 2, 3, [4], 5]
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_frompairspairs"></a>`_.fromPairs(pairs)` <h3 id="_frompairspairs"><code>_.fromPairs(pairs)</code></h3>
<a href="#_frompairspairs">#</a> [&#x24C8;](https://github.com/lodash/lodash/blo [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L7457 "View i
b/4.0.0/lodash.js#L5744 "View in source") [&#x24C9;][1] [&#x24C3;](https://www.n n source") [&#x24C3;](https://www.npmjs.com/package/lodash.frompairs "See the np
pmjs.com/package/lodash.frompairs "See the npm package") m package") [&#x24C9;][1]
The inverse of `_.toPairs`; this method returns an object composed The inverse of `_.toPairs`; this method returns an object composed
from key-value `pairs`. from key-value `pairs`.
#### Since
4.0.0
#### Arguments #### Arguments
1. `pairs` *(Array)*: The key-value pairs. 1. `pairs` *(Array)*: The key-value pairs.
#### Returns #### Returns
*(Object)*: Returns the new object. *(Object)*: Returns the new object.
#### Example #### Example
```js ```js
_.fromPairs([['fred', 30], ['barney', 40]]); _.fromPairs([['a', 1], ['b', 2]]);
// => { 'fred': 30, 'barney': 40 } // => { 'a': 1, 'b': 2 }
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_headarray"></a>`_.head(array)` <h3 id="_headarray"><code>_.head(array)</code></h3>
<a href="#_headarray">#</a> [&#x24C8;](https://github.com/lodash/lodash/blob/4.0 [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L7487 "View i
.0/lodash.js#L5773 "View in source") [&#x24C9;][1] [&#x24C3;](https://www.npmjs. n source") [&#x24C3;](https://www.npmjs.com/package/lodash.head "See the npm pac
com/package/lodash.head "See the npm package") kage") [&#x24C9;][1]
Gets the first element of `array`. Gets the first element of `array`.
#### Since
0.1.0
#### Aliases #### Aliases
*_.first* *_.first*
#### Arguments #### Arguments
1. `array` *(Array)*: The array to query. 1. `array` *(Array)*: The array to query.
#### Returns #### Returns
*(&#42;)*: Returns the first element of `array`. *(&#42;)*: Returns the first element of `array`.
#### Example #### Example
```js ```js
_.head([1, 2, 3]); _.head([1, 2, 3]);
// => 1 // => 1
_.head([]); _.head([]);
// => undefined // => undefined
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_indexofarray-value-fromindex0"></a>`_.indexOf(array, value, [fromInd <h3 id="_indexofarray-value-fromindex0"><code>_.indexOf(array, value, [fromIndex
ex=0])` =0])</code></h3>
<a href="#_indexofarray-value-fromindex0">#</a> [&#x24C8;](https://github.com/lo [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L7514 "View i
dash/lodash/blob/4.0.0/lodash.js#L5800 "View in source") [&#x24C9;][1] [&#x24C3; n source") [&#x24C3;](https://www.npmjs.com/package/lodash.indexof "See the npm
](https://www.npmjs.com/package/lodash.indexof "See the npm package") package") [&#x24C9;][1]
Gets the index at which the first occurrence of `value` is found in `array` Gets the index at which the first occurrence of `value` is found in `array`
using [`SameValueZero`](http://ecma-international.org/ecma-262/6.0/#sec-samevalu using [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevalu
ezero) ezero)
for equality comparisons. If `fromIndex` is negative, it's used as the offset for equality comparisons. If `fromIndex` is negative, it's used as the
from the end of `array`. If `array` is sorted providing `true` for `fromIndex` offset from the end of `array`.
performs a faster binary search.
#### Since
0.1.0
#### Arguments #### Arguments
1. `array` *(Array)*: The array to search. 1. `array` *(Array)*: The array to inspect.
2. `value` *(&#42;)*: The value to search for. 2. `value` *(&#42;)*: The value to search for.
3. `[fromIndex=0]` *(number)*: The index to search from. 3. `[fromIndex=0]` *(number)*: The index to search from.
#### Returns #### Returns
*(number)*: Returns the index of the matched value, else `-1`. *(number)*: Returns the index of the matched value, else `-1`.
#### Example #### Example
```js ```js
_.indexOf([1, 2, 1, 2], 2); _.indexOf([1, 2, 1, 2], 2);
// => 1 // => 1
// using `fromIndex` // Search from the `fromIndex`.
_.indexOf([1, 2, 1, 2], 2, 2); _.indexOf([1, 2, 1, 2], 2, 2);
// => 3 // => 3
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_initialarray"></a>`_.initial(array)` <h3 id="_initialarray"><code>_.initial(array)</code></h3>
<a href="#_initialarray">#</a> [&#x24C8;](https://github.com/lodash/lodash/blob/ [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L7540 "View i
4.0.0/lodash.js#L5825 "View in source") [&#x24C9;][1] [&#x24C3;](https://www.npm n source") [&#x24C3;](https://www.npmjs.com/package/lodash.initial "See the npm
js.com/package/lodash.initial "See the npm package") package") [&#x24C9;][1]
Gets all but the last element of `array`. Gets all but the last element of `array`.
#### Since
0.1.0
#### Arguments #### Arguments
1. `array` *(Array)*: The array to query. 1. `array` *(Array)*: The array to query.
#### Returns #### Returns
*(Array)*: Returns the slice of `array`. *(Array)*: Returns the slice of `array`.
#### Example #### Example
```js ```js
_.initial([1, 2, 3]); _.initial([1, 2, 3]);
// => [1, 2] // => [1, 2]
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_intersectionarrays"></a>`_.intersection([arrays])` <h3 id="_intersectionarrays"><code>_.intersection([arrays])</code></h3>
<a href="#_intersectionarrays">#</a> [&#x24C8;](https://github.com/lodash/lodash [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L7562 "View i
/blob/4.0.0/lodash.js#L5843 "View in source") [&#x24C9;][1] [&#x24C3;](https://w n source") [&#x24C3;](https://www.npmjs.com/package/lodash.intersection "See the
ww.npmjs.com/package/lodash.intersection "See the npm package") npm package") [&#x24C9;][1]
Creates an array of unique values that are included in all of the provided Creates an array of unique values that are included in all given arrays
arrays using [`SameValueZero`](http://ecma-international.org/ecma-262/6.0/#sec-s using [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevalu
amevaluezero) ezero)
for equality comparisons. for equality comparisons. The order and references of result values are
determined by the first array.
#### Since
0.1.0
#### Arguments #### Arguments
1. `[arrays]` *(...Array)*: The arrays to inspect. 1. `[arrays]` *(...Array)*: The arrays to inspect.
#### Returns #### Returns
*(Array)*: Returns the new array of shared values. *(Array)*: Returns the new array of intersecting values.
#### Example #### Example
```js ```js
_.intersection([2, 1], [4, 2], [1, 2]); _.intersection([2, 1], [2, 3]);
// => [2] // => [2]
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_intersectionbyarrays-iteratee_identity"></a>`_.intersectionBy([array <h3 id="_intersectionbyarrays-iteratee_identity"><code>_.intersectionBy([arrays]
s], [iteratee=_.identity])` , [iteratee=_.identity])</code></h3>
<a href="#_intersectionbyarrays-iteratee_identity">#</a> [&#x24C8;](https://gith [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L7592 "View i
ub.com/lodash/lodash/blob/4.0.0/lodash.js#L5870 "View in source") [&#x24C9;][1] n source") [&#x24C3;](https://www.npmjs.com/package/lodash.intersectionby "See t
[&#x24C3;](https://www.npmjs.com/package/lodash.intersectionby "See the npm pack he npm package") [&#x24C9;][1]
age")
This method is like `_.intersection` except that it accepts `iteratee` This method is like `_.intersection` except that it accepts `iteratee`
which is invoked for each element of each `arrays` to generate the criterion which is invoked for each element of each `arrays` to generate the criterion
by which uniqueness is computed. The iteratee is invoked with one argument: (val by which they're compared. The order and references of result values are
ue). determined by the first array. The iteratee is invoked with one argument:<br>
*(value)*.
#### Since
4.0.0
#### Arguments #### Arguments
1. `[arrays]` *(...Array)*: The arrays to inspect. 1. `[arrays]` *(...Array)*: The arrays to inspect.
2. `[iteratee=_.identity]` *(Function|Object|string)*: The iteratee invoked per element. 2. `[iteratee=_.identity]` *(Function)*: The iteratee invoked per element.
#### Returns #### Returns
*(Array)*: Returns the new array of shared values. *(Array)*: Returns the new array of intersecting values.
#### Example #### Example
```js ```js
_.intersectionBy([2.1, 1.2], [4.3, 2.4], Math.floor); _.intersectionBy([2.1, 1.2], [2.3, 3.4], Math.floor);
// => [2.1] // => [2.1]
// using the `_.property` iteratee shorthand // The `_.property` iteratee shorthand.
_.intersectionBy([{ 'x': 1 }], [{ 'x': 2 }, { 'x': 1 }], 'x'); _.intersectionBy([{ 'x': 1 }], [{ 'x': 2 }, { 'x': 1 }], 'x');
// => [{ 'x': 1 }] // => [{ 'x': 1 }]
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_intersectionwitharrays-comparator"></a>`_.intersectionWith([arrays], <h3 id="_intersectionwitharrays-comparator"><code>_.intersectionWith([arrays], [
[comparator])` comparator])</code></h3>
<a href="#_intersectionwitharrays-comparator">#</a> [&#x24C8;](https://github.co [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L7627 "View i
m/lodash/lodash/blob/4.0.0/lodash.js#L5903 "View in source") [&#x24C9;][1] [&#x2 n source") [&#x24C3;](https://www.npmjs.com/package/lodash.intersectionwith "See
4C3;](https://www.npmjs.com/package/lodash.intersectionwith "See the npm package the npm package") [&#x24C9;][1]
")
This method is like `_.intersection` except that it accepts `comparator` This method is like `_.intersection` except that it accepts `comparator`
which is invoked to compare elements of `arrays`. The comparator is invoked which is invoked to compare elements of `arrays`. The order and references
with two arguments: (arrVal, othVal). of result values are determined by the first array. The comparator is
invoked with two arguments: *(arrVal, othVal)*.
#### Since
4.0.0
#### Arguments #### Arguments
1. `[arrays]` *(...Array)*: The arrays to inspect. 1. `[arrays]` *(...Array)*: The arrays to inspect.
2. `[comparator]` *(Function)*: The comparator invoked per element. 2. `[comparator]` *(Function)*: The comparator invoked per element.
#### Returns #### Returns
*(Array)*: Returns the new array of shared values. *(Array)*: Returns the new array of intersecting values.
#### Example #### Example
```js ```js
var objects = [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }]; var objects = [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }];
var others = [{ 'x': 1, 'y': 1 }, { 'x': 1, 'y': 2 }]; var others = [{ 'x': 1, 'y': 1 }, { 'x': 1, 'y': 2 }];
_.intersectionWith(objects, others, _.isEqual); _.intersectionWith(objects, others, _.isEqual);
// => [{ 'x': 1, 'y': 2 }] // => [{ 'x': 1, 'y': 2 }]
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_joinarray-separator-"></a>`_.join(array, [separator=','])` <h3 id="_joinarray-separator-"><code>_.join(array, [separator=','])</code></h3>
<a href="#_joinarray-separator-">#</a> [&#x24C8;](https://github.com/lodash/loda [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L7655 "View i
sh/blob/4.0.0/lodash.js#L5931 "View in source") [&#x24C9;][1] [&#x24C3;](https:/ n source") [&#x24C3;](https://www.npmjs.com/package/lodash.join "See the npm pac
/www.npmjs.com/package/lodash.join "See the npm package") kage") [&#x24C9;][1]
Converts all elements in `array` into a string separated by `separator`. Converts all elements in `array` into a string separated by `separator`.
#### Since
4.0.0
#### Arguments #### Arguments
1. `array` *(Array)*: The array to convert. 1. `array` *(Array)*: The array to convert.
2. `[separator=',']` *(string)*: The element separator. 2. `[separator=',']` *(string)*: The element separator.
#### Returns #### Returns
*(string)*: Returns the joined string. *(string)*: Returns the joined string.
#### Example #### Example
```js ```js
_.join(['a', 'b', 'c'], '~'); _.join(['a', 'b', 'c'], '~');
// => 'a~b~c' // => 'a~b~c'
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_lastarray"></a>`_.last(array)` <h3 id="_lastarray"><code>_.last(array)</code></h3>
<a href="#_lastarray">#</a> [&#x24C8;](https://github.com/lodash/lodash/blob/4.0 [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L7673 "View i
.0/lodash.js#L5948 "View in source") [&#x24C9;][1] [&#x24C3;](https://www.npmjs. n source") [&#x24C3;](https://www.npmjs.com/package/lodash.last "See the npm pac
com/package/lodash.last "See the npm package") kage") [&#x24C9;][1]
Gets the last element of `array`. Gets the last element of `array`.
#### Since
0.1.0
#### Arguments #### Arguments
1. `array` *(Array)*: The array to query. 1. `array` *(Array)*: The array to query.
#### Returns #### Returns
*(&#42;)*: Returns the last element of `array`. *(&#42;)*: Returns the last element of `array`.
#### Example #### Example
```js ```js
_.last([1, 2, 3]); _.last([1, 2, 3]);
// => 3 // => 3
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_lastindexofarray-value-fromindexarraylength-1"></a>`_.lastIndexOf(ar <h3 id="_lastindexofarray-value-fromindexarraylength-1"><code>_.lastIndexOf(arra
ray, value, [fromIndex=array.length-1])` y, value, [fromIndex=array.length-1])</code></h3>
<a href="#_lastindexofarray-value-fromindexarraylength-1">#</a> [&#x24C8;](https [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L7699 "View i
://github.com/lodash/lodash/blob/4.0.0/lodash.js#L5973 "View in source") [&#x24C n source") [&#x24C3;](https://www.npmjs.com/package/lodash.lastindexof "See the
9;][1] [&#x24C3;](https://www.npmjs.com/package/lodash.lastindexof "See the npm npm package") [&#x24C9;][1]
package")
This method is like `_.indexOf` except that it iterates over elements of This method is like `_.indexOf` except that it iterates over elements of
`array` from right to left. `array` from right to left.
#### Since
0.1.0
#### Arguments #### Arguments
1. `array` *(Array)*: The array to search. 1. `array` *(Array)*: The array to inspect.
2. `value` *(&#42;)*: The value to search for. 2. `value` *(&#42;)*: The value to search for.
3. `[fromIndex=array.length-1]` *(number)*: The index to search from. 3. `[fromIndex=array.length-1]` *(number)*: The index to search from.
#### Returns #### Returns
*(number)*: Returns the index of the matched value, else `-1`. *(number)*: Returns the index of the matched value, else `-1`.
#### Example #### Example
```js ```js
_.lastIndexOf([1, 2, 1, 2], 2); _.lastIndexOf([1, 2, 1, 2], 2);
// => 3 // => 3
// using `fromIndex` // Search from the `fromIndex`.
_.lastIndexOf([1, 2, 1, 2], 2, 2); _.lastIndexOf([1, 2, 1, 2], 2, 2);
// => 1 // => 1
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_pullarray-values"></a>`_.pull(array, [values])` <h3 id="_ntharray-n0"><code>_.nth(array, [n=0])</code></h3>
<a href="#_pullarray-values">#</a> [&#x24C8;](https://github.com/lodash/lodash/b [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L7735 "View i
lob/4.0.0/lodash.js#L6015 "View in source") [&#x24C9;][1] [&#x24C3;](https://www n source") [&#x24C3;](https://www.npmjs.com/package/lodash.nth "See the npm pack
.npmjs.com/package/lodash.pull "See the npm package") age") [&#x24C9;][1]
Removes all provided values from `array` using Gets the element at index `n` of `array`. If `n` is negative, the nth
[`SameValueZero`](http://ecma-international.org/ecma-262/6.0/#sec-samevaluezero) element from the end is returned.
#### Since
4.11.0
#### Arguments
1. `array` *(Array)*: The array to query.
2. `[n=0]` *(number)*: The index of the element to return.
#### Returns
*(&#42;)*: Returns the nth element of `array`.
#### Example
```js
var array = ['a', 'b', 'c', 'd'];
_.nth(array, 1);
// => 'b'
_.nth(array, -2);
// => 'c';
```
---
<!-- /div -->
<!-- div -->
<h3 id="_pullarray-values"><code>_.pull(array, [values])</code></h3>
[&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L7762 "View i
n source") [&#x24C3;](https://www.npmjs.com/package/lodash.pull "See the npm pac
kage") [&#x24C9;][1]
Removes all given values from `array` using
[`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
for equality comparisons. for equality comparisons.
<br> <br>
<br> <br>
**Note:** Unlike `_.without`, this method mutates `array`. **Note:** Unlike `_.without`, this method mutates `array`. Use `_.remove`
to remove elements from an array by predicate.
#### Since
2.0.0
#### Arguments #### Arguments
1. `array` *(Array)*: The array to modify. 1. `array` *(Array)*: The array to modify.
2. `[values]` *(...&#42;)*: The values to remove. 2. `[values]` *(...&#42;)*: The values to remove.
#### Returns #### Returns
*(Array)*: Returns `array`. *(Array)*: Returns `array`.
#### Example #### Example
```js ```js
var array = [1, 2, 3, 1, 2, 3]; var array = ['a', 'b', 'c', 'a', 'b', 'c'];
_.pull(array, 2, 3); _.pull(array, 'a', 'c');
console.log(array); console.log(array);
// => [1, 1] // => ['b', 'b']
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_pullallarray-values"></a>`_.pullAll(array, values)` <h3 id="_pullallarray-values"><code>_.pullAll(array, values)</code></h3>
<a href="#_pullallarray-values">#</a> [&#x24C8;](https://github.com/lodash/lodas [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L7784 "View i
h/blob/4.0.0/lodash.js#L6036 "View in source") [&#x24C9;][1] [&#x24C3;](https:// n source") [&#x24C3;](https://www.npmjs.com/package/lodash.pullall "See the npm
www.npmjs.com/package/lodash.pullall "See the npm package") package") [&#x24C9;][1]
This method is like `_.pull` except that it accepts an array of values to remove . This method is like `_.pull` except that it accepts an array of values to remove .
<br> <br>
<br> <br>
**Note:** Unlike `_.difference`, this method mutates `array`. **Note:** Unlike `_.difference`, this method mutates `array`.
#### Since
4.0.0
#### Arguments #### Arguments
1. `array` *(Array)*: The array to modify. 1. `array` *(Array)*: The array to modify.
2. `values` *(Array)*: The values to remove. 2. `values` *(Array)*: The values to remove.
#### Returns #### Returns
*(Array)*: Returns `array`. *(Array)*: Returns `array`.
#### Example #### Example
```js ```js
var array = [1, 2, 3, 1, 2, 3]; var array = ['a', 'b', 'c', 'a', 'b', 'c'];
_.pull(array, [2, 3]); _.pullAll(array, ['a', 'c']);
console.log(array); console.log(array);
// => [1, 1] // => ['b', 'b']
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_pullallbyarray-values-iteratee_identity"></a>`_.pullAllBy(array, val <h3 id="_pullallbyarray-values-iteratee_identity"><code>_.pullAllBy(array, value
ues, [iteratee=_.identity])` s, [iteratee=_.identity])</code></h3>
<a href="#_pullallbyarray-values-iteratee_identity">#</a> [&#x24C8;](https://git [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L7813 "View i
hub.com/lodash/lodash/blob/4.0.0/lodash.js#L6064 "View in source") [&#x24C9;][1] n source") [&#x24C3;](https://www.npmjs.com/package/lodash.pullallby "See the np
[&#x24C3;](https://www.npmjs.com/package/lodash.pullallby "See the npm package" m package") [&#x24C9;][1]
)
This method is like `_.pullAll` except that it accepts `iteratee` which is This method is like `_.pullAll` except that it accepts `iteratee` which is
invoked for each element of `array` and `values` to to generate the criterion invoked for each element of `array` and `values` to generate the criterion
by which uniqueness is computed. The iteratee is invoked with one argument: (val by which they're compared. The iteratee is invoked with one argument: *(value)*.
ue).
<br> <br>
<br> <br>
**Note:** Unlike `_.differenceBy`, this method mutates `array`. **Note:** Unlike `_.differenceBy`, this method mutates `array`.
#### Since
4.0.0
#### Arguments #### Arguments
1. `array` *(Array)*: The array to modify. 1. `array` *(Array)*: The array to modify.
2. `values` *(Array)*: The values to remove. 2. `values` *(Array)*: The values to remove.
3. `[iteratee=_.identity]` *(Function|Object|string)*: The iteratee invoked per element. 3. `[iteratee=_.identity]` *(Function)*: The iteratee invoked per element.
#### Returns #### Returns
*(Array)*: Returns `array`. *(Array)*: Returns `array`.
#### Example #### Example
```js ```js
var array = [{ 'x': 1 }, { 'x': 2 }, { 'x': 3 }, { 'x': 1 }]; var array = [{ 'x': 1 }, { 'x': 2 }, { 'x': 3 }, { 'x': 1 }];
_.pullAllBy(array, [{ 'x': 1 }, { 'x': 3 }], 'x'); _.pullAllBy(array, [{ 'x': 1 }, { 'x': 3 }], 'x');
console.log(array); console.log(array);
// => [{ 'x': 2 }] // => [{ 'x': 2 }]
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_pullatarray-indexes"></a>`_.pullAt(array, [indexes])` <h3 id="_pullallwitharray-values-comparator"><code>_.pullAllWith(array, values,
<a href="#_pullatarray-indexes">#</a> [&#x24C8;](https://github.com/lodash/lodas [comparator])</code></h3>
h/blob/4.0.0/lodash.js#L6094 "View in source") [&#x24C9;][1] [&#x24C3;](https:// [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L7842 "View i
www.npmjs.com/package/lodash.pullat "See the npm package") n source") [&#x24C3;](https://www.npmjs.com/package/lodash.pullallwith "See the
npm package") [&#x24C9;][1]
This method is like `_.pullAll` except that it accepts `comparator` which
is invoked to compare elements of `array` to `values`. The comparator is
invoked with two arguments: *(arrVal, othVal)*.
<br>
<br>
**Note:** Unlike `_.differenceWith`, this method mutates `array`.
#### Since
4.6.0
#### Arguments
1. `array` *(Array)*: The array to modify.
2. `values` *(Array)*: The values to remove.
3. `[comparator]` *(Function)*: The comparator invoked per element.
#### Returns
*(Array)*: Returns `array`.
#### Example
```js
var array = [{ 'x': 1, 'y': 2 }, { 'x': 3, 'y': 4 }, { 'x': 5, 'y': 6 }];
_.pullAllWith(array, [{ 'x': 3, 'y': 4 }], _.isEqual);
console.log(array);
// => [{ 'x': 1, 'y': 2 }, { 'x': 5, 'y': 6 }]
```
---
<!-- /div -->
<!-- div -->
<h3 id="_pullatarray-indexes"><code>_.pullAt(array, [indexes])</code></h3>
[&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L7872 "View i
n source") [&#x24C3;](https://www.npmjs.com/package/lodash.pullat "See the npm p
ackage") [&#x24C9;][1]
Removes elements from `array` corresponding to `indexes` and returns an Removes elements from `array` corresponding to `indexes` and returns an
array of removed elements. array of removed elements.
<br> <br>
<br> <br>
**Note:** Unlike `_.at`, this method mutates `array`. **Note:** Unlike `_.at`, this method mutates `array`.
#### Since
3.0.0
#### Arguments #### Arguments
1. `array` *(Array)*: The array to modify. 1. `array` *(Array)*: The array to modify.
2. `[indexes]` *(...(number|number&#91;&#93;)*: The indexes of elements to remov e, specified individually or in arrays. 2. `[indexes]` *(...(number|number&#91;&#93;))*: The indexes of elements to remo ve.
#### Returns #### Returns
*(Array)*: Returns the new array of removed elements. *(Array)*: Returns the new array of removed elements.
#### Example #### Example
```js ```js
var array = [5, 10, 15, 20]; var array = ['a', 'b', 'c', 'd'];
var evens = _.pullAt(array, 1, 3); var pulled = _.pullAt(array, [1, 3]);
console.log(array); console.log(array);
// => [5, 15] // => ['a', 'c']
console.log(evens); console.log(pulled);
// => [10, 20] // => ['b', 'd']
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_removearray-predicate_identity"></a>`_.remove(array, [predicate=_.id <h3 id="_removearray-predicate_identity"><code>_.remove(array, [predicate=_.iden
entity])` tity])</code></h3>
<a href="#_removearray-predicate_identity">#</a> [&#x24C8;](https://github.com/l [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L7911 "View i
odash/lodash/blob/4.0.0/lodash.js#L6128 "View in source") [&#x24C9;][1] [&#x24C3 n source") [&#x24C3;](https://www.npmjs.com/package/lodash.remove "See the npm p
;](https://www.npmjs.com/package/lodash.remove "See the npm package") ackage") [&#x24C9;][1]
Removes all elements from `array` that `predicate` returns truthy for Removes all elements from `array` that `predicate` returns truthy for
and returns an array of the removed elements. The predicate is invoked with and returns an array of the removed elements. The predicate is invoked
three arguments: (value, index, array). with three arguments: *(value, index, array)*.
<br> <br>
<br> <br>
**Note:** Unlike `_.filter`, this method mutates `array`. **Note:** Unlike `_.filter`, this method mutates `array`. Use `_.pull`
to pull elements from an array by value.
#### Since
2.0.0
#### Arguments #### Arguments
1. `array` *(Array)*: The array to modify. 1. `array` *(Array)*: The array to modify.
2. `[predicate=_.identity]` *(Function|Object|string)*: The function invoked per iteration. 2. `[predicate=_.identity]` *(Function)*: The function invoked per iteration.
#### Returns #### Returns
*(Array)*: Returns the new array of removed elements. *(Array)*: Returns the new array of removed elements.
#### Example #### Example
```js ```js
var array = [1, 2, 3, 4]; var array = [1, 2, 3, 4];
var evens = _.remove(array, function(n) { var evens = _.remove(array, function(n) {
return n % 2 == 0; return n % 2 == 0;
}); });
console.log(array); console.log(array);
// => [1, 3] // => [1, 3]
console.log(evens); console.log(evens);
// => [2, 4] // => [2, 4]
``` ```
* * * ---
<!-- /div -->
<!-- div -->
<h3 id="_reversearray"><code>_.reverse(array)</code></h3>
[&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L7955 "View i
n source") [&#x24C3;](https://www.npmjs.com/package/lodash.reverse "See the npm
package") [&#x24C9;][1]
Reverses `array` so that the first element becomes the last, the second
element becomes the second to last, and so on.
<br>
<br>
**Note:** This method mutates `array` and is based on
[`Array#reverse`](https://mdn.io/Array/reverse).
#### Since
4.0.0
#### Arguments
1. `array` *(Array)*: The array to modify.
#### Returns
*(Array)*: Returns `array`.
#### Example
```js
var array = [1, 2, 3];
_.reverse(array);
// => [3, 2, 1]
console.log(array);
// => [3, 2, 1]
```
---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_slicearray-start0-endarraylength"></a>`_.slice(array, [start=0], [en <h3 id="_slicearray-start0-endarraylength"><code>_.slice(array, [start=0], [end=
d=array.length])` array.length])</code></h3>
<a href="#_slicearray-start0-endarraylength">#</a> [&#x24C8;](https://github.com [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L7975 "View i
/lodash/lodash/blob/4.0.0/lodash.js#L6187 "View in source") [&#x24C9;][1] [&#x24 n source") [&#x24C3;](https://www.npmjs.com/package/lodash.slice "See the npm pa
C3;](https://www.npmjs.com/package/lodash.slice "See the npm package") ckage") [&#x24C9;][1]
Creates a slice of `array` from `start` up to, but not including, `end`. Creates a slice of `array` from `start` up to, but not including, `end`.
<br> <br>
<br> <br>
**Note:** This method is used instead of [`Array#slice`](https://mdn.io/Array/sl **Note:** This method is used instead of
ice) [`Array#slice`](https://mdn.io/Array/slice) to ensure dense arrays are
to ensure dense arrays are returned. returned.
#### Since
3.0.0
#### Arguments #### Arguments
1. `array` *(Array)*: The array to slice. 1. `array` *(Array)*: The array to slice.
2. `[start=0]` *(number)*: The start position. 2. `[start=0]` *(number)*: The start position.
3. `[end=array.length]` *(number)*: The end position. 3. `[end=array.length]` *(number)*: The end position.
#### Returns #### Returns
*(Array)*: Returns the slice of `array`. *(Array)*: Returns the slice of `array`.
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_sortedindexarray-value"></a>`_.sortedIndex(array, value)` <h3 id="_sortedindexarray-value"><code>_.sortedIndex(array, value)</code></h3>
<a href="#_sortedindexarray-value">#</a> [&#x24C8;](https://github.com/lodash/lo [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L8008 "View i
dash/blob/4.0.0/lodash.js#L6221 "View in source") [&#x24C9;][1] [&#x24C3;](https n source") [&#x24C3;](https://www.npmjs.com/package/lodash.sortedindex "See the
://www.npmjs.com/package/lodash.sortedindex "See the npm package") npm package") [&#x24C9;][1]
Uses a binary search to determine the lowest index at which `value` should Uses a binary search to determine the lowest index at which `value`
be inserted into `array` in order to maintain its sort order. should be inserted into `array` in order to maintain its sort order.
#### Since
0.1.0
#### Arguments #### Arguments
1. `array` *(Array)*: The sorted array to inspect. 1. `array` *(Array)*: The sorted array to inspect.
2. `value` *(&#42;)*: The value to evaluate. 2. `value` *(&#42;)*: The value to evaluate.
#### Returns #### Returns
*(number)*: Returns the index at which `value` should be inserted into `array`. *(number)*: Returns the index at which `value` should be inserted into `array`.
#### Example #### Example
```js ```js
_.sortedIndex([30, 50], 40); _.sortedIndex([30, 50], 40);
// => 1 // => 1
_.sortedIndex([4, 5], 4);
// => 0
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_sortedindexbyarray-value-iteratee_identity"></a>`_.sortedIndexBy(arr <h3 id="_sortedindexbyarray-value-iteratee_identity"><code>_.sortedIndexBy(array
ay, value, [iteratee=_.identity])` , value, [iteratee=_.identity])</code></h3>
<a href="#_sortedindexbyarray-value-iteratee_identity">#</a> [&#x24C8;](https:// [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L8037 "View i
github.com/lodash/lodash/blob/4.0.0/lodash.js#L6248 "View in source") [&#x24C9;] n source") [&#x24C3;](https://www.npmjs.com/package/lodash.sortedindexby "See th
[1] [&#x24C3;](https://www.npmjs.com/package/lodash.sortedindexby "See the npm p e npm package") [&#x24C9;][1]
ackage")
This method is like `_.sortedIndex` except that it accepts `iteratee` This method is like `_.sortedIndex` except that it accepts `iteratee`
which is invoked for `value` and each element of `array` to compute their which is invoked for `value` and each element of `array` to compute their
sort ranking. The iteratee is invoked with one argument: (value). sort ranking. The iteratee is invoked with one argument: *(value)*.
#### Since
4.0.0
#### Arguments #### Arguments
1. `array` *(Array)*: The sorted array to inspect. 1. `array` *(Array)*: The sorted array to inspect.
2. `value` *(&#42;)*: The value to evaluate. 2. `value` *(&#42;)*: The value to evaluate.
3. `[iteratee=_.identity]` *(Function|Object|string)*: The iteratee invoked per element. 3. `[iteratee=_.identity]` *(Function)*: The iteratee invoked per element.
#### Returns #### Returns
*(number)*: Returns the index at which `value` should be inserted into `array`. *(number)*: Returns the index at which `value` should be inserted into `array`.
#### Example #### Example
```js ```js
var dict = { 'thirty': 30, 'forty': 40, 'fifty': 50 }; var objects = [{ 'x': 4 }, { 'x': 5 }];
_.sortedIndexBy(['thirty', 'fifty'], 'forty', _.propertyOf(dict)); _.sortedIndexBy(objects, { 'x': 4 }, function(o) { return o.x; });
// => 1 // => 0
// using the `_.property` iteratee shorthand // The `_.property` iteratee shorthand.
_.sortedIndexBy([{ 'x': 4 }, { 'x': 5 }], { 'x': 4 }, 'x'); _.sortedIndexBy(objects, { 'x': 4 }, 'x');
// => 0 // => 0
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_sortedindexofarray-value"></a>`_.sortedIndexOf(array, value)` <h3 id="_sortedindexofarray-value"><code>_.sortedIndexOf(array, value)</code></h
<a href="#_sortedindexofarray-value">#</a> [&#x24C8;](https://github.com/lodash/ 3>
lodash/blob/4.0.0/lodash.js#L6267 "View in source") [&#x24C9;][1] [&#x24C3;](htt [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L8057 "View i
ps://www.npmjs.com/package/lodash.sortedindexof "See the npm package") n source") [&#x24C3;](https://www.npmjs.com/package/lodash.sortedindexof "See th
e npm package") [&#x24C9;][1]
This method is like `_.indexOf` except that it performs a binary This method is like `_.indexOf` except that it performs a binary
search on a sorted `array`. search on a sorted `array`.
#### Since
4.0.0
#### Arguments #### Arguments
1. `array` *(Array)*: The array to search. 1. `array` *(Array)*: The array to inspect.
2. `value` *(&#42;)*: The value to search for. 2. `value` *(&#42;)*: The value to search for.
#### Returns #### Returns
*(number)*: Returns the index of the matched value, else `-1`. *(number)*: Returns the index of the matched value, else `-1`.
#### Example #### Example
```js ```js
_.sortedIndexOf([1, 1, 2, 2], 2); _.sortedIndexOf([4, 5, 5, 5, 6], 5);
// => 2 // => 1
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_sortedlastindexarray-value"></a>`_.sortedLastIndex(array, value)` <h3 id="_sortedlastindexarray-value"><code>_.sortedLastIndex(array, value)</code
<a href="#_sortedlastindexarray-value">#</a> [&#x24C8;](https://github.com/lodas ></h3>
h/lodash/blob/4.0.0/lodash.js#L6294 "View in source") [&#x24C9;][1] [&#x24C3;](h [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L8086 "View i
ttps://www.npmjs.com/package/lodash.sortedlastindex "See the npm package") n source") [&#x24C3;](https://www.npmjs.com/package/lodash.sortedlastindex "See
the npm package") [&#x24C9;][1]
This method is like `_.sortedIndex` except that it returns the highest This method is like `_.sortedIndex` except that it returns the highest
index at which `value` should be inserted into `array` in order to index at which `value` should be inserted into `array` in order to
maintain its sort order. maintain its sort order.
#### Since
3.0.0
#### Arguments #### Arguments
1. `array` *(Array)*: The sorted array to inspect. 1. `array` *(Array)*: The sorted array to inspect.
2. `value` *(&#42;)*: The value to evaluate. 2. `value` *(&#42;)*: The value to evaluate.
#### Returns #### Returns
*(number)*: Returns the index at which `value` should be inserted into `array`. *(number)*: Returns the index at which `value` should be inserted into `array`.
#### Example #### Example
```js ```js
_.sortedLastIndex([4, 5], 4); _.sortedLastIndex([4, 5, 5, 5, 6], 5);
// => 1 // => 4
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_sortedlastindexbyarray-value-iteratee_identity"></a>`_.sortedLastInd <h3 id="_sortedlastindexbyarray-value-iteratee_identity"><code>_.sortedLastIndex
exBy(array, value, [iteratee=_.identity])` By(array, value, [iteratee=_.identity])</code></h3>
<a href="#_sortedlastindexbyarray-value-iteratee_identity">#</a> [&#x24C8;](http [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L8115 "View i
s://github.com/lodash/lodash/blob/4.0.0/lodash.js#L6316 "View in source") [&#x24 n source") [&#x24C3;](https://www.npmjs.com/package/lodash.sortedlastindexby "Se
C9;][1] [&#x24C3;](https://www.npmjs.com/package/lodash.sortedlastindexby "See t e the npm package") [&#x24C9;][1]
he npm package")
This method is like `_.sortedLastIndex` except that it accepts `iteratee` This method is like `_.sortedLastIndex` except that it accepts `iteratee`
which is invoked for `value` and each element of `array` to compute their which is invoked for `value` and each element of `array` to compute their
sort ranking. The iteratee is invoked with one argument: (value). sort ranking. The iteratee is invoked with one argument: *(value)*.
#### Since
4.0.0
#### Arguments #### Arguments
1. `array` *(Array)*: The sorted array to inspect. 1. `array` *(Array)*: The sorted array to inspect.
2. `value` *(&#42;)*: The value to evaluate. 2. `value` *(&#42;)*: The value to evaluate.
3. `[iteratee=_.identity]` *(Function|Object|string)*: The iteratee invoked per element. 3. `[iteratee=_.identity]` *(Function)*: The iteratee invoked per element.
#### Returns #### Returns
*(number)*: Returns the index at which `value` should be inserted into `array`. *(number)*: Returns the index at which `value` should be inserted into `array`.
#### Example #### Example
```js ```js
// using the `_.property` iteratee shorthand var objects = [{ 'x': 4 }, { 'x': 5 }];
_.sortedLastIndexBy([{ 'x': 4 }, { 'x': 5 }], { 'x': 4 }, 'x');
_.sortedLastIndexBy(objects, { 'x': 4 }, function(o) { return o.x; });
// => 1
// The `_.property` iteratee shorthand.
_.sortedLastIndexBy(objects, { 'x': 4 }, 'x');
// => 1 // => 1
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_sortedlastindexofarray-value"></a>`_.sortedLastIndexOf(array, value) <h3 id="_sortedlastindexofarray-value"><code>_.sortedLastIndexOf(array, value)</
` code></h3>
<a href="#_sortedlastindexofarray-value">#</a> [&#x24C8;](https://github.com/lod [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L8135 "View i
ash/lodash/blob/4.0.0/lodash.js#L6335 "View in source") [&#x24C9;][1] [&#x24C3;] n source") [&#x24C3;](https://www.npmjs.com/package/lodash.sortedlastindexof "Se
(https://www.npmjs.com/package/lodash.sortedlastindexof "See the npm package") e the npm package") [&#x24C9;][1]
This method is like `_.lastIndexOf` except that it performs a binary This method is like `_.lastIndexOf` except that it performs a binary
search on a sorted `array`. search on a sorted `array`.
#### Since
4.0.0
#### Arguments #### Arguments
1. `array` *(Array)*: The array to search. 1. `array` *(Array)*: The array to inspect.
2. `value` *(&#42;)*: The value to search for. 2. `value` *(&#42;)*: The value to search for.
#### Returns #### Returns
*(number)*: Returns the index of the matched value, else `-1`. *(number)*: Returns the index of the matched value, else `-1`.
#### Example #### Example
```js ```js
_.sortedLastIndexOf([1, 1, 2, 2], 2); _.sortedLastIndexOf([4, 5, 5, 5, 6], 5);
// => 3 // => 3
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_sorteduniqarray"></a>`_.sortedUniq(array)` <h3 id="_sorteduniqarray"><code>_.sortedUniq(array)</code></h3>
<a href="#_sorteduniqarray">#</a> [&#x24C8;](https://github.com/lodash/lodash/bl [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L8161 "View i
ob/4.0.0/lodash.js#L6360 "View in source") [&#x24C9;][1] [&#x24C3;](https://www. n source") [&#x24C3;](https://www.npmjs.com/package/lodash.sorteduniq "See the n
npmjs.com/package/lodash.sorteduniq "See the npm package") pm package") [&#x24C9;][1]
This method is like `_.uniq` except that it's designed and optimized This method is like `_.uniq` except that it's designed and optimized
for sorted arrays. for sorted arrays.
#### Since
4.0.0
#### Arguments #### Arguments
1. `array` *(Array)*: The array to inspect. 1. `array` *(Array)*: The array to inspect.
#### Returns #### Returns
*(Array)*: Returns the new duplicate free array. *(Array)*: Returns the new duplicate free array.
#### Example #### Example
```js ```js
_.sortedUniq([1, 1, 2]); _.sortedUniq([1, 1, 2]);
// => [1, 2] // => [1, 2]
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_sorteduniqbyarray-iteratee"></a>`_.sortedUniqBy(array, [iteratee])` <h3 id="_sorteduniqbyarray-iteratee"><code>_.sortedUniqBy(array, [iteratee])</co
<a href="#_sorteduniqbyarray-iteratee">#</a> [&#x24C8;](https://github.com/lodas de></h3>
h/lodash/blob/4.0.0/lodash.js#L6381 "View in source") [&#x24C9;][1] [&#x24C3;](h [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L8183 "View i
ttps://www.npmjs.com/package/lodash.sorteduniqby "See the npm package") n source") [&#x24C3;](https://www.npmjs.com/package/lodash.sorteduniqby "See the
npm package") [&#x24C9;][1]
This method is like `_.uniqBy` except that it's designed and optimized This method is like `_.uniqBy` except that it's designed and optimized
for sorted arrays. for sorted arrays.
#### Since
4.0.0
#### Arguments #### Arguments
1. `array` *(Array)*: The array to inspect. 1. `array` *(Array)*: The array to inspect.
2. `[iteratee]` *(Function)*: The iteratee invoked per element. 2. `[iteratee]` *(Function)*: The iteratee invoked per element.
#### Returns #### Returns
*(Array)*: Returns the new duplicate free array. *(Array)*: Returns the new duplicate free array.
#### Example #### Example
```js ```js
_.sortedUniqBy([1.1, 1.2, 2.3, 2.4], Math.floor); _.sortedUniqBy([1.1, 1.2, 2.3, 2.4], Math.floor);
// => [1.1, 2.2] // => [1.1, 2.3]
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_tailarray"></a>`_.tail(array)` <h3 id="_tailarray"><code>_.tail(array)</code></h3>
<a href="#_tailarray">#</a> [&#x24C8;](https://github.com/lodash/lodash/blob/4.0 [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L8203 "View i
.0/lodash.js#L6400 "View in source") [&#x24C9;][1] [&#x24C3;](https://www.npmjs. n source") [&#x24C3;](https://www.npmjs.com/package/lodash.tail "See the npm pac
com/package/lodash.tail "See the npm package") kage") [&#x24C9;][1]
Gets all but the first element of `array`. Gets all but the first element of `array`.
#### Since
4.0.0
#### Arguments #### Arguments
1. `array` *(Array)*: The array to query. 1. `array` *(Array)*: The array to query.
#### Returns #### Returns
*(Array)*: Returns the slice of `array`. *(Array)*: Returns the slice of `array`.
#### Example #### Example
```js ```js
_.tail([1, 2, 3]); _.tail([1, 2, 3]);
// => [2, 3] // => [2, 3]
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_takearray-n1"></a>`_.take(array, [n=1])` <h3 id="_takearray-n1"><code>_.take(array, [n=1])</code></h3>
<a href="#_takearray-n1">#</a> [&#x24C8;](https://github.com/lodash/lodash/blob/ [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L8233 "View i
4.0.0/lodash.js#L6428 "View in source") [&#x24C9;][1] [&#x24C3;](https://www.npm n source") [&#x24C3;](https://www.npmjs.com/package/lodash.take "See the npm pac
js.com/package/lodash.take "See the npm package") kage") [&#x24C9;][1]
Creates a slice of `array` with `n` elements taken from the beginning. Creates a slice of `array` with `n` elements taken from the beginning.
#### Since
0.1.0
#### Arguments #### Arguments
1. `array` *(Array)*: The array to query. 1. `array` *(Array)*: The array to query.
2. `[n=1]` *(number)*: The number of elements to take. 2. `[n=1]` *(number)*: The number of elements to take.
#### Returns #### Returns
*(Array)*: Returns the slice of `array`. *(Array)*: Returns the slice of `array`.
#### Example #### Example
```js ```js
_.take([1, 2, 3]); _.take([1, 2, 3]);
// => [1] // => [1]
_.take([1, 2, 3], 2); _.take([1, 2, 3], 2);
// => [1, 2] // => [1, 2]
_.take([1, 2, 3], 5); _.take([1, 2, 3], 5);
// => [1, 2, 3] // => [1, 2, 3]
_.take([1, 2, 3], 0); _.take([1, 2, 3], 0);
// => [] // => []
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_takerightarray-n1"></a>`_.takeRight(array, [n=1])` <h3 id="_takerightarray-n1"><code>_.takeRight(array, [n=1])</code></h3>
<a href="#_takerightarray-n1">#</a> [&#x24C8;](https://github.com/lodash/lodash/ [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L8266 "View i
blob/4.0.0/lodash.js#L6460 "View in source") [&#x24C9;][1] [&#x24C3;](https://ww n source") [&#x24C3;](https://www.npmjs.com/package/lodash.takeright "See the np
w.npmjs.com/package/lodash.takeright "See the npm package") m package") [&#x24C9;][1]
Creates a slice of `array` with `n` elements taken from the end. Creates a slice of `array` with `n` elements taken from the end.
#### Since
3.0.0
#### Arguments #### Arguments
1. `array` *(Array)*: The array to query. 1. `array` *(Array)*: The array to query.
2. `[n=1]` *(number)*: The number of elements to take. 2. `[n=1]` *(number)*: The number of elements to take.
#### Returns #### Returns
*(Array)*: Returns the slice of `array`. *(Array)*: Returns the slice of `array`.
#### Example #### Example
```js ```js
_.takeRight([1, 2, 3]); _.takeRight([1, 2, 3]);
// => [3] // => [3]
_.takeRight([1, 2, 3], 2); _.takeRight([1, 2, 3], 2);
// => [2, 3] // => [2, 3]
_.takeRight([1, 2, 3], 5); _.takeRight([1, 2, 3], 5);
// => [1, 2, 3] // => [1, 2, 3]
_.takeRight([1, 2, 3], 0); _.takeRight([1, 2, 3], 0);
// => [] // => []
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_takerightwhilearray-predicate_identity"></a>`_.takeRightWhile(array, <h3 id="_takerightwhilearray-predicate_identity"><code>_.takeRightWhile(array, [
[predicate=_.identity])` predicate=_.identity])</code></h3>
<a href="#_takerightwhilearray-predicate_identity">#</a> [&#x24C8;](https://gith [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L8311 "View i
ub.com/lodash/lodash/blob/4.0.0/lodash.js#L6504 "View in source") [&#x24C9;][1] n source") [&#x24C3;](https://www.npmjs.com/package/lodash.takerightwhile "See t
[&#x24C3;](https://www.npmjs.com/package/lodash.takerightwhile "See the npm pack he npm package") [&#x24C9;][1]
age")
Creates a slice of `array` with elements taken from the end. Elements are Creates a slice of `array` with elements taken from the end. Elements are
taken until `predicate` returns falsey. The predicate is invoked with three taken until `predicate` returns falsey. The predicate is invoked with
arguments: (value, index, array). three arguments: *(value, index, array)*.
#### Since
3.0.0
#### Arguments #### Arguments
1. `array` *(Array)*: The array to query. 1. `array` *(Array)*: The array to query.
2. `[predicate=_.identity]` *(Function|Object|string)*: The function invoked per iteration. 2. `[predicate=_.identity]` *(Function)*: The function invoked per iteration.
#### Returns #### Returns
*(Array)*: Returns the slice of `array`. *(Array)*: Returns the slice of `array`.
#### Example #### Example
```js ```js
var users = [ var users = [
{ 'user': 'barney', 'active': true }, { 'user': 'barney', 'active': true },
{ 'user': 'fred', 'active': false }, { 'user': 'fred', 'active': false },
{ 'user': 'pebbles', 'active': false } { 'user': 'pebbles', 'active': false }
]; ];
_.takeRightWhile(users, function(o) { return !o.active; }); _.takeRightWhile(users, function(o) { return !o.active; });
// => objects for ['fred', 'pebbles'] // => objects for ['fred', 'pebbles']
// using the `_.matches` iteratee shorthand // The `_.matches` iteratee shorthand.
_.takeRightWhile(users, { 'user': 'pebbles', 'active': false }); _.takeRightWhile(users, { 'user': 'pebbles', 'active': false });
// => objects for ['pebbles'] // => objects for ['pebbles']
// using the `_.matchesProperty` iteratee shorthand // The `_.matchesProperty` iteratee shorthand.
_.takeRightWhile(users, ['active', false]); _.takeRightWhile(users, ['active', false]);
// => objects for ['fred', 'pebbles'] // => objects for ['fred', 'pebbles']
// using the `_.property` iteratee shorthand // The `_.property` iteratee shorthand.
_.takeRightWhile(users, 'active'); _.takeRightWhile(users, 'active');
// => [] // => []
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_takewhilearray-predicate_identity"></a>`_.takeWhile(array, [predicat <h3 id="_takewhilearray-predicate_identity"><code>_.takeWhile(array, [predicate=
e=_.identity])` _.identity])</code></h3>
<a href="#_takewhilearray-predicate_identity">#</a> [&#x24C8;](https://github.co [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L8352 "View i
m/lodash/lodash/blob/4.0.0/lodash.js#L6544 "View in source") [&#x24C9;][1] [&#x2 n source") [&#x24C3;](https://www.npmjs.com/package/lodash.takewhile "See the np
4C3;](https://www.npmjs.com/package/lodash.takewhile "See the npm package") m package") [&#x24C9;][1]
Creates a slice of `array` with elements taken from the beginning. Elements Creates a slice of `array` with elements taken from the beginning. Elements
are taken until `predicate` returns falsey. The predicate is invoked with are taken until `predicate` returns falsey. The predicate is invoked with
three arguments: (value, index, array). three arguments: *(value, index, array)*.
#### Since
3.0.0
#### Arguments #### Arguments
1. `array` *(Array)*: The array to query. 1. `array` *(Array)*: The array to query.
2. `[predicate=_.identity]` *(Function|Object|string)*: The function invoked per iteration. 2. `[predicate=_.identity]` *(Function)*: The function invoked per iteration.
#### Returns #### Returns
*(Array)*: Returns the slice of `array`. *(Array)*: Returns the slice of `array`.
#### Example #### Example
```js ```js
var users = [ var users = [
{ 'user': 'barney', 'active': false }, { 'user': 'barney', 'active': false },
{ 'user': 'fred', 'active': false}, { 'user': 'fred', 'active': false },
{ 'user': 'pebbles', 'active': true } { 'user': 'pebbles', 'active': true }
]; ];
_.takeWhile(users, function(o) { return !o.active; }); _.takeWhile(users, function(o) { return !o.active; });
// => objects for ['barney', 'fred'] // => objects for ['barney', 'fred']
// using the `_.matches` iteratee shorthand // The `_.matches` iteratee shorthand.
_.takeWhile(users, { 'user': 'barney', 'active': false }); _.takeWhile(users, { 'user': 'barney', 'active': false });
// => objects for ['barney'] // => objects for ['barney']
// using the `_.matchesProperty` iteratee shorthand // The `_.matchesProperty` iteratee shorthand.
_.takeWhile(users, ['active', false]); _.takeWhile(users, ['active', false]);
// => objects for ['barney', 'fred'] // => objects for ['barney', 'fred']
// using the `_.property` iteratee shorthand // The `_.property` iteratee shorthand.
_.takeWhile(users, 'active'); _.takeWhile(users, 'active');
// => [] // => []
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_unionarrays"></a>`_.union([arrays])` <h3 id="_unionarrays"><code>_.union([arrays])</code></h3>
<a href="#_unionarrays">#</a> [&#x24C8;](https://github.com/lodash/lodash/blob/4 [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L8374 "View i
.0.0/lodash.js#L6565 "View in source") [&#x24C9;][1] [&#x24C3;](https://www.npmj n source") [&#x24C3;](https://www.npmjs.com/package/lodash.union "See the npm pa
s.com/package/lodash.union "See the npm package") ckage") [&#x24C9;][1]
Creates an array of unique values, in order, from all of the provided arrays Creates an array of unique values, in order, from all given arrays using
using [`SameValueZero`](http://ecma-international.org/ecma-262/6.0/#sec-samevalu [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
ezero)
for equality comparisons. for equality comparisons.
#### Since
0.1.0
#### Arguments #### Arguments
1. `[arrays]` *(...Array)*: The arrays to inspect. 1. `[arrays]` *(...Array)*: The arrays to inspect.
#### Returns #### Returns
*(Array)*: Returns the new array of combined values. *(Array)*: Returns the new array of combined values.
#### Example #### Example
```js ```js
_.union([2, 1], [4, 2], [1, 2]); _.union([2], [1, 2]);
// => [2, 1, 4] // => [2, 1]
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_unionbyarrays-iteratee_identity"></a>`_.unionBy([arrays], [iteratee= <h3 id="_unionbyarrays-iteratee_identity"><code>_.unionBy([arrays], [iteratee=_.
_.identity])` identity])</code></h3>
<a href="#_unionbyarrays-iteratee_identity">#</a> [&#x24C8;](https://github.com/ [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L8401 "View i
lodash/lodash/blob/4.0.0/lodash.js#L6589 "View in source") [&#x24C9;][1] [&#x24C n source") [&#x24C3;](https://www.npmjs.com/package/lodash.unionby "See the npm
3;](https://www.npmjs.com/package/lodash.unionby "See the npm package") package") [&#x24C9;][1]
This method is like `_.union` except that it accepts `iteratee` which is This method is like `_.union` except that it accepts `iteratee` which is
invoked for each element of each `arrays` to generate the criterion by which invoked for each element of each `arrays` to generate the criterion by
uniqueness is computed. The iteratee is invoked with one argument: (value). which uniqueness is computed. Result values are chosen from the first
array in which the value occurs. The iteratee is invoked with one argument:<br>
*(value)*.
#### Since
4.0.0
#### Arguments #### Arguments
1. `[arrays]` *(...Array)*: The arrays to inspect. 1. `[arrays]` *(...Array)*: The arrays to inspect.
2. `[iteratee=_.identity]` *(Function|Object|string)*: The iteratee invoked per element. 2. `[iteratee=_.identity]` *(Function)*: The iteratee invoked per element.
#### Returns #### Returns
*(Array)*: Returns the new array of combined values. *(Array)*: Returns the new array of combined values.
#### Example #### Example
```js ```js
_.unionBy([2.1, 1.2], [4.3, 2.4], Math.floor); _.unionBy([2.1], [1.2, 2.3], Math.floor);
// => [2.1, 1.2, 4.3] // => [2.1, 1.2]
// using the `_.property` iteratee shorthand // The `_.property` iteratee shorthand.
_.unionBy([{ 'x': 1 }], [{ 'x': 2 }, { 'x': 1 }], 'x'); _.unionBy([{ 'x': 1 }], [{ 'x': 2 }, { 'x': 1 }], 'x');
// => [{ 'x': 1 }, { 'x': 2 }] // => [{ 'x': 1 }, { 'x': 2 }]
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_unionwitharrays-comparator"></a>`_.unionWith([arrays], [comparator]) <h3 id="_unionwitharrays-comparator"><code>_.unionWith([arrays], [comparator])</
` code></h3>
<a href="#_unionwitharrays-comparator">#</a> [&#x24C8;](https://github.com/lodas [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L8430 "View i
h/lodash/blob/4.0.0/lodash.js#L6616 "View in source") [&#x24C9;][1] [&#x24C3;](h n source") [&#x24C3;](https://www.npmjs.com/package/lodash.unionwith "See the np
ttps://www.npmjs.com/package/lodash.unionwith "See the npm package") m package") [&#x24C9;][1]
This method is like `_.union` except that it accepts `comparator` which This method is like `_.union` except that it accepts `comparator` which
is invoked to compare elements of `arrays`. The comparator is invoked is invoked to compare elements of `arrays`. Result values are chosen from
with two arguments: (arrVal, othVal). the first array in which the value occurs. The comparator is invoked
with two arguments: *(arrVal, othVal)*.
#### Since
4.0.0
#### Arguments #### Arguments
1. `[arrays]` *(...Array)*: The arrays to inspect. 1. `[arrays]` *(...Array)*: The arrays to inspect.
2. `[comparator]` *(Function)*: The comparator invoked per element. 2. `[comparator]` *(Function)*: The comparator invoked per element.
#### Returns #### Returns
*(Array)*: Returns the new array of combined values. *(Array)*: Returns the new array of combined values.
#### Example #### Example
```js ```js
var objects = [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }]; var objects = [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }];
var others = [{ 'x': 1, 'y': 1 }, { 'x': 1, 'y': 2 }]; var others = [{ 'x': 1, 'y': 1 }, { 'x': 1, 'y': 2 }];
_.unionWith(objects, others, _.isEqual); _.unionWith(objects, others, _.isEqual);
// => [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }, { 'x': 1, 'y': 1 }] // => [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }, { 'x': 1, 'y': 1 }]
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_uniqarray"></a>`_.uniq(array)` <h3 id="_uniqarray"><code>_.uniq(array)</code></h3>
<a href="#_uniqarray">#</a> [&#x24C8;](https://github.com/lodash/lodash/blob/4.0 [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L8454 "View i
.0/lodash.js#L6640 "View in source") [&#x24C9;][1] [&#x24C3;](https://www.npmjs. n source") [&#x24C3;](https://www.npmjs.com/package/lodash.uniq "See the npm pac
com/package/lodash.uniq "See the npm package") kage") [&#x24C9;][1]
Creates a duplicate-free version of an array, using Creates a duplicate-free version of an array, using
[`SameValueZero`](http://ecma-international.org/ecma-262/6.0/#sec-samevaluezero) [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
for equality comparisons, in which only the first occurrence of each element for equality comparisons, in which only the first occurrence of each element
is kept. is kept. The order of result values is determined by the order they occur
in the array.
#### Since
0.1.0
#### Arguments #### Arguments
1. `array` *(Array)*: The array to inspect. 1. `array` *(Array)*: The array to inspect.
#### Returns #### Returns
*(Array)*: Returns the new duplicate free array. *(Array)*: Returns the new duplicate free array.
#### Example #### Example
```js ```js
_.uniq([2, 1, 2]); _.uniq([2, 1, 2]);
// => [2, 1] // => [2, 1]
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_uniqbyarray-iteratee_identity"></a>`_.uniqBy(array, [iteratee=_.iden <h3 id="_uniqbyarray-iteratee_identity"><code>_.uniqBy(array, [iteratee=_.identi
tity])` ty])</code></h3>
<a href="#_uniqbyarray-iteratee_identity">#</a> [&#x24C8;](https://github.com/lo [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L8481 "View i
dash/lodash/blob/4.0.0/lodash.js#L6666 "View in source") [&#x24C9;][1] [&#x24C3; n source") [&#x24C3;](https://www.npmjs.com/package/lodash.uniqby "See the npm p
](https://www.npmjs.com/package/lodash.uniqby "See the npm package") ackage") [&#x24C9;][1]
This method is like `_.uniq` except that it accepts `iteratee` which is This method is like `_.uniq` except that it accepts `iteratee` which is
invoked for each element in `array` to generate the criterion by which invoked for each element in `array` to generate the criterion by which
uniqueness is computed. The iteratee is invoked with one argument: (value). uniqueness is computed. The order of result values is determined by the
order they occur in the array. The iteratee is invoked with one argument:<br>
*(value)*.
#### Since
4.0.0
#### Arguments #### Arguments
1. `array` *(Array)*: The array to inspect. 1. `array` *(Array)*: The array to inspect.
2. `[iteratee=_.identity]` *(Function|Object|string)*: The iteratee invoked per element. 2. `[iteratee=_.identity]` *(Function)*: The iteratee invoked per element.
#### Returns #### Returns
*(Array)*: Returns the new duplicate free array. *(Array)*: Returns the new duplicate free array.
#### Example #### Example
```js ```js
_.uniqBy([2.1, 1.2, 2.3], Math.floor); _.uniqBy([2.1, 1.2, 2.3], Math.floor);
// => [2.1, 1.2] // => [2.1, 1.2]
// using the `_.property` iteratee shorthand // The `_.property` iteratee shorthand.
_.uniqBy([{ 'x': 1 }, { 'x': 2 }, { 'x': 1 }], 'x'); _.uniqBy([{ 'x': 1 }, { 'x': 2 }, { 'x': 1 }], 'x');
// => [{ 'x': 1 }, { 'x': 2 }] // => [{ 'x': 1 }, { 'x': 2 }]
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_uniqwitharray-comparator"></a>`_.uniqWith(array, [comparator])` <h3 id="_uniqwitharray-comparator"><code>_.uniqWith(array, [comparator])</code><
<a href="#_uniqwitharray-comparator">#</a> [&#x24C8;](https://github.com/lodash/ /h3>
lodash/blob/4.0.0/lodash.js#L6690 "View in source") [&#x24C9;][1] [&#x24C3;](htt [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L8505 "View i
ps://www.npmjs.com/package/lodash.uniqwith "See the npm package") n source") [&#x24C3;](https://www.npmjs.com/package/lodash.uniqwith "See the npm
package") [&#x24C9;][1]
This method is like `_.uniq` except that it accepts `comparator` which This method is like `_.uniq` except that it accepts `comparator` which
is invoked to compare elements of `array`. The comparator is invoked with is invoked to compare elements of `array`. The order of result values is
two arguments: (arrVal, othVal). determined by the order they occur in the array.The comparator is invoked
with two arguments: *(arrVal, othVal)*.
#### Since
4.0.0
#### Arguments #### Arguments
1. `array` *(Array)*: The array to inspect. 1. `array` *(Array)*: The array to inspect.
2. `[comparator]` *(Function)*: The comparator invoked per element. 2. `[comparator]` *(Function)*: The comparator invoked per element.
#### Returns #### Returns
*(Array)*: Returns the new duplicate free array. *(Array)*: Returns the new duplicate free array.
#### Example #### Example
```js ```js
var objects = [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }, { 'x': 1, 'y': 2 }]; var objects = [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }, { 'x': 1, 'y': 2 }];
_.uniqWith(objects, _.isEqual); _.uniqWith(objects, _.isEqual);
// => [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }] // => [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }]
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_unziparray"></a>`_.unzip(array)` <h3 id="_unziparray"><code>_.unzip(array)</code></h3>
<a href="#_unziparray">#</a> [&#x24C8;](https://github.com/lodash/lodash/blob/4. [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L8529 "View i
0.0/lodash.js#L6714 "View in source") [&#x24C9;][1] [&#x24C3;](https://www.npmjs n source") [&#x24C3;](https://www.npmjs.com/package/lodash.unzip "See the npm pa
.com/package/lodash.unzip "See the npm package") ckage") [&#x24C9;][1]
This method is like `_.zip` except that it accepts an array of grouped This method is like `_.zip` except that it accepts an array of grouped
elements and creates an array regrouping the elements to their pre-zip elements and creates an array regrouping the elements to their pre-zip
configuration. configuration.
#### Since
1.2.0
#### Arguments #### Arguments
1. `array` *(Array)*: The array of grouped elements to process. 1. `array` *(Array)*: The array of grouped elements to process.
#### Returns #### Returns
*(Array)*: Returns the new array of regrouped elements. *(Array)*: Returns the new array of regrouped elements.
#### Example #### Example
```js ```js
var zipped = _.zip(['fred', 'barney'], [30, 40], [true, false]); var zipped = _.zip(['a', 'b'], [1, 2], [true, false]);
// => [['fred', 30, true], ['barney', 40, false]] // => [['a', 1, true], ['b', 2, false]]
_.unzip(zipped); _.unzip(zipped);
// => [['fred', 'barney'], [30, 40], [true, false]] // => [['a', 'b'], [1, 2], [true, false]]
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_unzipwitharray-iteratee_identity"></a>`_.unzipWith(array, [iteratee= <h3 id="_unzipwitharray-iteratee_identity"><code>_.unzipWith(array, [iteratee=_.
_.identity])` identity])</code></h3>
<a href="#_unzipwitharray-iteratee_identity">#</a> [&#x24C8;](https://github.com [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L8566 "View i
/lodash/lodash/blob/4.0.0/lodash.js#L6749 "View in source") [&#x24C9;][1] [&#x24 n source") [&#x24C3;](https://www.npmjs.com/package/lodash.unzipwith "See the np
C3;](https://www.npmjs.com/package/lodash.unzipwith "See the npm package") m package") [&#x24C9;][1]
This method is like `_.unzip` except that it accepts `iteratee` to specify This method is like `_.unzip` except that it accepts `iteratee` to specify
how regrouped values should be combined. The iteratee is invoked with the how regrouped values should be combined. The iteratee is invoked with the
elements of each group: (...group). elements of each group: *(...group)*.
#### Since
3.8.0
#### Arguments #### Arguments
1. `array` *(Array)*: The array of grouped elements to process. 1. `array` *(Array)*: The array of grouped elements to process.
2. `[iteratee=_.identity]` *(Function)*: The function to combine regrouped value s. 2. `[iteratee=_.identity]` *(Function)*: The function to combine regrouped value s.
#### Returns #### Returns
*(Array)*: Returns the new array of regrouped elements. *(Array)*: Returns the new array of regrouped elements.
#### Example #### Example
```js ```js
var zipped = _.zip([1, 2], [10, 20], [100, 200]); var zipped = _.zip([1, 2], [10, 20], [100, 200]);
// => [[1, 10, 100], [2, 20, 200]] // => [[1, 10, 100], [2, 20, 200]]
_.unzipWith(zipped, _.add); _.unzipWith(zipped, _.add);
// => [3, 30, 300] // => [3, 30, 300]
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_withoutarray-values"></a>`_.without(array, [values])` <h3 id="_withoutarray-values"><code>_.without(array, [values])</code></h3>
<a href="#_withoutarray-values">#</a> [&#x24C8;](https://github.com/lodash/lodas [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L8599 "View i
h/blob/4.0.0/lodash.js#L6778 "View in source") [&#x24C9;][1] [&#x24C3;](https:// n source") [&#x24C3;](https://www.npmjs.com/package/lodash.without "See the npm
www.npmjs.com/package/lodash.without "See the npm package") package") [&#x24C9;][1]
Creates an array excluding all provided values using Creates an array excluding all given values using
[`SameValueZero`](http://ecma-international.org/ecma-262/6.0/#sec-samevaluezero) [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
for equality comparisons. for equality comparisons.
<br>
<br>
**Note:** Unlike `_.pull`, this method returns a new array.
#### Since
0.1.0
#### Arguments #### Arguments
1. `array` *(Array)*: The array to filter. 1. `array` *(Array)*: The array to inspect.
2. `[values]` *(...&#42;)*: The values to exclude. 2. `[values]` *(...&#42;)*: The values to exclude.
#### Returns #### Returns
*(Array)*: Returns the new array of filtered values. *(Array)*: Returns the new array of filtered values.
#### Example #### Example
```js ```js
_.without([1, 2, 1, 3], 1, 2); _.without([2, 1, 2, 3], 1, 2);
// => [3] // => [3]
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_xorarrays"></a>`_.xor([arrays])` <h3 id="_xorarrays"><code>_.xor([arrays])</code></h3>
<a href="#_xorarrays">#</a> [&#x24C8;](https://github.com/lodash/lodash/blob/4.0 [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L8623 "View i
.0/lodash.js#L6798 "View in source") [&#x24C9;][1] [&#x24C3;](https://www.npmjs. n source") [&#x24C3;](https://www.npmjs.com/package/lodash.xor "See the npm pack
com/package/lodash.xor "See the npm package") age") [&#x24C9;][1]
Creates an array of unique values that is the [symmetric difference](https://en. Creates an array of unique values that is the
wikipedia.org/wiki/Symmetric_difference) [symmetric difference](https://en.wikipedia.org/wiki/Symmetric_difference)
of the provided arrays. of the given arrays. The order of result values is determined by the order
they occur in the arrays.
#### Since
2.4.0
#### Arguments #### Arguments
1. `[arrays]` *(...Array)*: The arrays to inspect. 1. `[arrays]` *(...Array)*: The arrays to inspect.
#### Returns #### Returns
*(Array)*: Returns the new array of values. *(Array)*: Returns the new array of filtered values.
#### Example #### Example
```js ```js
_.xor([2, 1], [4, 2]); _.xor([2, 1], [2, 3]);
// => [1, 4] // => [1, 3]
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_xorbyarrays-iteratee_identity"></a>`_.xorBy([arrays], [iteratee=_.id <h3 id="_xorbyarrays-iteratee_identity"><code>_.xorBy([arrays], [iteratee=_.iden
entity])` tity])</code></h3>
<a href="#_xorbyarrays-iteratee_identity">#</a> [&#x24C8;](https://github.com/lo [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L8650 "View i
dash/lodash/blob/4.0.0/lodash.js#L6822 "View in source") [&#x24C9;][1] [&#x24C3; n source") [&#x24C3;](https://www.npmjs.com/package/lodash.xorby "See the npm pa
](https://www.npmjs.com/package/lodash.xorby "See the npm package") ckage") [&#x24C9;][1]
This method is like `_.xor` except that it accepts `iteratee` which is This method is like `_.xor` except that it accepts `iteratee` which is
invoked for each element of each `arrays` to generate the criterion by which invoked for each element of each `arrays` to generate the criterion by
uniqueness is computed. The iteratee is invoked with one argument: (value). which by which they're compared. The order of result values is determined
by the order they occur in the arrays. The iteratee is invoked with one
argument: *(value)*.
#### Since
4.0.0
#### Arguments #### Arguments
1. `[arrays]` *(...Array)*: The arrays to inspect. 1. `[arrays]` *(...Array)*: The arrays to inspect.
2. `[iteratee=_.identity]` *(Function|Object|string)*: The iteratee invoked per element. 2. `[iteratee=_.identity]` *(Function)*: The iteratee invoked per element.
#### Returns #### Returns
*(Array)*: Returns the new array of values. *(Array)*: Returns the new array of filtered values.
#### Example #### Example
```js ```js
_.xorBy([2.1, 1.2], [4.3, 2.4], Math.floor); _.xorBy([2.1, 1.2], [2.3, 3.4], Math.floor);
// => [1.2, 4.3] // => [1.2, 3.4]
// using the `_.property` iteratee shorthand // The `_.property` iteratee shorthand.
_.xorBy([{ 'x': 1 }], [{ 'x': 2 }, { 'x': 1 }], 'x'); _.xorBy([{ 'x': 1 }], [{ 'x': 2 }, { 'x': 1 }], 'x');
// => [{ 'x': 2 }] // => [{ 'x': 2 }]
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_xorwitharrays-comparator"></a>`_.xorWith([arrays], [comparator])` <h3 id="_xorwitharrays-comparator"><code>_.xorWith([arrays], [comparator])</code
<a href="#_xorwitharrays-comparator">#</a> [&#x24C8;](https://github.com/lodash/ ></h3>
lodash/blob/4.0.0/lodash.js#L6849 "View in source") [&#x24C9;][1] [&#x24C3;](htt [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L8679 "View i
ps://www.npmjs.com/package/lodash.xorwith "See the npm package") n source") [&#x24C3;](https://www.npmjs.com/package/lodash.xorwith "See the npm
package") [&#x24C9;][1]
This method is like `_.xor` except that it accepts `comparator` which is This method is like `_.xor` except that it accepts `comparator` which is
invoked to compare elements of `arrays`. The comparator is invoked with invoked to compare elements of `arrays`. The order of result values is
two arguments: (arrVal, othVal). determined by the order they occur in the arrays. The comparator is invoked
with two arguments: *(arrVal, othVal)*.
#### Since
4.0.0
#### Arguments #### Arguments
1. `[arrays]` *(...Array)*: The arrays to inspect. 1. `[arrays]` *(...Array)*: The arrays to inspect.
2. `[comparator]` *(Function)*: The comparator invoked per element. 2. `[comparator]` *(Function)*: The comparator invoked per element.
#### Returns #### Returns
*(Array)*: Returns the new array of values. *(Array)*: Returns the new array of filtered values.
#### Example #### Example
```js ```js
var objects = [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }]; var objects = [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }];
var others = [{ 'x': 1, 'y': 1 }, { 'x': 1, 'y': 2 }]; var others = [{ 'x': 1, 'y': 1 }, { 'x': 1, 'y': 2 }];
_.xorWith(objects, others, _.isEqual); _.xorWith(objects, others, _.isEqual);
// => [{ 'x': 2, 'y': 1 }, { 'x': 1, 'y': 1 }] // => [{ 'x': 2, 'y': 1 }, { 'x': 1, 'y': 1 }]
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_ziparrays"></a>`_.zip([arrays])` <h3 id="_ziparrays"><code>_.zip([arrays])</code></h3>
<a href="#_ziparrays">#</a> [&#x24C8;](https://github.com/lodash/lodash/blob/4.0 [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L8701 "View i
.0/lodash.js#L6872 "View in source") [&#x24C9;][1] [&#x24C3;](https://www.npmjs. n source") [&#x24C3;](https://www.npmjs.com/package/lodash.zip "See the npm pack
com/package/lodash.zip "See the npm package") age") [&#x24C9;][1]
Creates an array of grouped elements, the first of which contains the
first elements of the given arrays, the second of which contains the
second elements of the given arrays, and so on.
Creates an array of grouped elements, the first of which contains the first #### Since
elements of the given arrays, the second of which contains the second elements 0.1.0
of the given arrays, and so on.
#### Arguments #### Arguments
1. `[arrays]` *(...Array)*: The arrays to process. 1. `[arrays]` *(...Array)*: The arrays to process.
#### Returns #### Returns
*(Array)*: Returns the new array of grouped elements. *(Array)*: Returns the new array of grouped elements.
#### Example #### Example
```js ```js
_.zip(['fred', 'barney'], [30, 40], [true, false]); _.zip(['a', 'b'], [1, 2], [true, false]);
// => [['fred', 30, true], ['barney', 40, false]] // => [['a', 1, true], ['b', 2, false]]
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_zipobjectprops-values"></a>`_.zipObject([props=[]], [values=[]])` <h3 id="_zipobjectprops-values"><code>_.zipObject([props=[]], [values=[]])</code
<a href="#_zipobjectprops-values">#</a> [&#x24C8;](https://github.com/lodash/lod ></h3>
ash/blob/4.0.0/lodash.js#L6889 "View in source") [&#x24C9;][1] [&#x24C3;](https: [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L8719 "View i
//www.npmjs.com/package/lodash.zipobject "See the npm package") n source") [&#x24C3;](https://www.npmjs.com/package/lodash.zipobject "See the np
m package") [&#x24C9;][1]
This method is like `_.fromPairs` except that it accepts two arrays, This method is like `_.fromPairs` except that it accepts two arrays,
one of property names and one of corresponding values. one of property identifiers and one of corresponding values.
#### Since
0.4.0
#### Arguments #### Arguments
1. `[props=[]]` *(Array)*: The property names. 1. `[props=[]]` *(Array)*: The property identifiers.
2. `[values=[]]` *(Array)*: The property values. 2. `[values=[]]` *(Array)*: The property values.
#### Returns #### Returns
*(Object)*: Returns the new object. *(Object)*: Returns the new object.
#### Example #### Example
```js ```js
_.zipObject(['fred', 'barney'], [30, 40]); _.zipObject(['a', 'b'], [1, 2]);
// => { 'fred': 30, 'barney': 40 } // => { 'a': 1, 'b': 2 }
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_zipwitharrays-iteratee_identity"></a>`_.zipWith([arrays], [iteratee= <h3 id="_zipobjectdeepprops-values"><code>_.zipObjectDeep([props=[]], [values=[]
_.identity])` ])</code></h3>
<a href="#_zipwitharrays-iteratee_identity">#</a> [&#x24C8;](https://github.com/ [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L8738 "View i
lodash/lodash/blob/4.0.0/lodash.js#L6919 "View in source") [&#x24C9;][1] [&#x24C n source") [&#x24C3;](https://www.npmjs.com/package/lodash.zipobjectdeep "See th
3;](https://www.npmjs.com/package/lodash.zipwith "See the npm package") e npm package") [&#x24C9;][1]
This method is like `_.zip` except that it accepts `iteratee` to specify This method is like `_.zipObject` except that it supports property paths.
how grouped values should be combined. The iteratee is invoked with the
elements of each group: (...group). #### Since
4.1.0
#### Arguments #### Arguments
1. `[arrays]` *(...Array)*: The arrays to process. 1. `[props=[]]` *(Array)*: The property identifiers.
2. `[iteratee=_.identity]` *(Function)*: The function to combine grouped values. 2. `[values=[]]` *(Array)*: The property values.
#### Returns #### Returns
*(Array)*: Returns the new array of grouped elements. *(Object)*: Returns the new object.
#### Example #### Example
```js ```js
_.zipWith([1, 2], [10, 20], [100, 200], function(a, b, c) { _.zipObjectDeep(['a.b[0].c', 'a.b[1].d'], [1, 2]);
return a + b + c; // => { 'a': { 'b': [{ 'c': 1 }, { 'd': 2 }] } }
});
// => [111, 222]
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_prototypereverse"></a>`_.prototype.reverse()` <h3 id="_zipwitharrays-iteratee_identity"><code>_.zipWith([arrays], [iteratee=_.
<a href="#_prototypereverse">#</a> [&#x24C8;](https://github.com/lodash/lodash/b identity])</code></h3>
lob/4.0.0/lodash.js#L6169 "View in source") [&#x24C9;][1] [&#x24C3;](https://www [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L8762 "View i
.npmjs.com/package/lodash.reverse "See the npm package") n source") [&#x24C3;](https://www.npmjs.com/package/lodash.zipwith "See the npm
package") [&#x24C9;][1]
Reverses `array` so that the first element becomes the last, the second This method is like `_.zip` except that it accepts `iteratee` to specify
element becomes the second to last, and so on. how grouped values should be combined. The iteratee is invoked with the
<br> elements of each group: *(...group)*.
<br>
**Note:** This method mutates `array` and is based on #### Since
[`Array#reverse`](https://mdn.io/Array/reverse). 3.8.0
#### Arguments
1. `[arrays]` *(...Array)*: The arrays to process.
2. `[iteratee=_.identity]` *(Function)*: The function to combine grouped values.
#### Returns #### Returns
*(Array)*: Returns `array`. *(Array)*: Returns the new array of grouped elements.
#### Example #### Example
```js ```js
var array = [1, 2, 3]; _.zipWith([1, 2], [10, 20], [100, 200], function(a, b, c) {
return a + b + c;
_.reverse(array); });
// => [3, 2, 1] // => [111, 222]
console.log(array);
// => [3, 2, 1]
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
## `“Collection” Methods` ## `“Collection” Methods`
<!-- div --> <!-- div -->
### <a id="_countbycollection-iteratee_identity"></a>`_.countBy(collection, [ite <h3 id="_countbycollection-iteratee_identity"><code>_.countBy(collection, [itera
ratee=_.identity])` tee=_.identity])</code></h3>
<a href="#_countbycollection-iteratee_identity">#</a> [&#x24C8;](https://github. [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L9141 "View i
com/lodash/lodash/blob/4.0.0/lodash.js#L7299 "View in source") [&#x24C9;][1] [&# n source") [&#x24C3;](https://www.npmjs.com/package/lodash.countby "See the npm
x24C3;](https://www.npmjs.com/package/lodash.countby "See the npm package") package") [&#x24C9;][1]
Creates an object composed of keys generated from the results of running Creates an object composed of keys generated from the results of running
each element of `collection` through `iteratee`. The corresponding value each element of `collection` thru `iteratee`. The corresponding value of
of each key is the number of times the key was returned by `iteratee`. each key is the number of times the key was returned by `iteratee`. The
The iteratee is invoked with one argument: (value). iteratee is invoked with one argument: *(value)*.
#### Since
0.5.0
#### Arguments #### Arguments
1. `collection` *(Array|Object)*: The collection to iterate over. 1. `collection` *(Array|Object)*: The collection to iterate over.
2. `[iteratee=_.identity]` *(Function|Object|string)*: The iteratee invoked per element. 2. `[iteratee=_.identity]` *(Function)*: The iteratee to transform keys.
#### Returns #### Returns
*(Object)*: Returns the composed aggregate object. *(Object)*: Returns the composed aggregate object.
#### Example #### Example
```js ```js
_.countBy([6.1, 4.2, 6.3], Math.floor); _.countBy([6.1, 4.2, 6.3], Math.floor);
// => { '4': 1, '6': 2 } // => { '4': 1, '6': 2 }
// The `_.property` iteratee shorthand.
_.countBy(['one', 'two', 'three'], 'length'); _.countBy(['one', 'two', 'three'], 'length');
// => { '3': 2, '5': 1 } // => { '3': 2, '5': 1 }
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_everycollection-predicate_identity"></a>`_.every(collection, [predic <h3 id="_everycollection-predicate_identity"><code>_.every(collection, [predicat
ate=_.identity])` e=_.identity])</code></h3>
<a href="#_everycollection-predicate_identity">#</a> [&#x24C8;](https://github.c [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L9190 "View i
om/lodash/lodash/blob/4.0.0/lodash.js#L7337 "View in source") [&#x24C9;][1] [&#x n source") [&#x24C3;](https://www.npmjs.com/package/lodash.every "See the npm pa
24C3;](https://www.npmjs.com/package/lodash.every "See the npm package") ckage") [&#x24C9;][1]
Checks if `predicate` returns truthy for **all** elements of `collection`. Checks if `predicate` returns truthy for **all** elements of `collection`.
Iteration is stopped once `predicate` returns falsey. The predicate is Iteration is stopped once `predicate` returns falsey. The predicate is
invoked with three arguments: (value, index|key, collection). invoked with three arguments: *(value, index|key, collection)*.
<br>
<br>
**Note:** This method returns `true` for
[empty collections](https://en.wikipedia.org/wiki/Empty_set) because
[everything is true](https://en.wikipedia.org/wiki/Vacuous_truth) of
elements of empty collections.
#### Since
0.1.0
#### Arguments #### Arguments
1. `collection` *(Array|Object)*: The collection to iterate over. 1. `collection` *(Array|Object)*: The collection to iterate over.
2. `[predicate=_.identity]` *(Function|Object|string)*: The function invoked per iteration. 2. `[predicate=_.identity]` *(Function)*: The function invoked per iteration.
#### Returns #### Returns
*(boolean)*: Returns `true` if all elements pass the predicate check, else `fal se`. *(boolean)*: Returns `true` if all elements pass the predicate check, else `fals e`.
#### Example #### Example
```js ```js
_.every([true, 1, null, 'yes'], Boolean); _.every([true, 1, null, 'yes'], Boolean);
// => false // => false
var users = [ var users = [
{ 'user': 'barney', 'active': false }, { 'user': 'barney', 'age': 36, 'active': false },
{ 'user': 'fred', 'active': false } { 'user': 'fred', 'age': 40, 'active': false }
]; ];
// using the `_.matches` iteratee shorthand // The `_.matches` iteratee shorthand.
_.every(users, { 'user': 'barney', 'active': false }); _.every(users, { 'user': 'barney', 'active': false });
// => false // => false
// using the `_.matchesProperty` iteratee shorthand // The `_.matchesProperty` iteratee shorthand.
_.every(users, ['active', false]); _.every(users, ['active', false]);
// => true // => true
// using the `_.property` iteratee shorthand // The `_.property` iteratee shorthand.
_.every(users, 'active'); _.every(users, 'active');
// => false // => false
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_filtercollection-predicate_identity"></a>`_.filter(collection, [pred <h3 id="_filtercollection-predicate_identity"><code>_.filter(collection, [predic
icate=_.identity])` ate=_.identity])</code></h3>
<a href="#_filtercollection-predicate_identity">#</a> [&#x24C8;](https://github. [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L9239 "View i
com/lodash/lodash/blob/4.0.0/lodash.js#L7378 "View in source") [&#x24C9;][1] [&# n source") [&#x24C3;](https://www.npmjs.com/package/lodash.filter "See the npm p
x24C3;](https://www.npmjs.com/package/lodash.filter "See the npm package") ackage") [&#x24C9;][1]
Iterates over elements of `collection`, returning an array of all elements Iterates over elements of `collection`, returning an array of all elements
`predicate` returns truthy for. The predicate is invoked with three arguments:<b `predicate` returns truthy for. The predicate is invoked with three
r> arguments: *(value, index|key, collection)*.
(value, index|key, collection). <br>
<br>
**Note:** Unlike `_.remove`, this method returns a new array.
#### Since
0.1.0
#### Arguments #### Arguments
1. `collection` *(Array|Object)*: The collection to iterate over. 1. `collection` *(Array|Object)*: The collection to iterate over.
2. `[predicate=_.identity]` *(Function|Object|string)*: The function invoked per iteration. 2. `[predicate=_.identity]` *(Function)*: The function invoked per iteration.
#### Returns #### Returns
*(Array)*: Returns the new filtered array. *(Array)*: Returns the new filtered array.
#### Example #### Example
```js ```js
var users = [ var users = [
{ 'user': 'barney', 'age': 36, 'active': true }, { 'user': 'barney', 'age': 36, 'active': true },
{ 'user': 'fred', 'age': 40, 'active': false } { 'user': 'fred', 'age': 40, 'active': false }
]; ];
_.filter(users, function(o) { return !o.active; }); _.filter(users, function(o) { return !o.active; });
// => objects for ['fred'] // => objects for ['fred']
// using the `_.matches` iteratee shorthand // The `_.matches` iteratee shorthand.
_.filter(users, { 'age': 36, 'active': true }); _.filter(users, { 'age': 36, 'active': true });
// => objects for ['barney'] // => objects for ['barney']
// using the `_.matchesProperty` iteratee shorthand // The `_.matchesProperty` iteratee shorthand.
_.filter(users, ['active', false]); _.filter(users, ['active', false]);
// => objects for ['fred'] // => objects for ['fred']
// using the `_.property` iteratee shorthand // The `_.property` iteratee shorthand.
_.filter(users, 'active'); _.filter(users, 'active');
// => objects for ['barney'] // => objects for ['barney']
// Combining several predicates using `_.overEvery` or `_.overSome`.
_.filter(users, _.overSome([{ 'age': 36 }, ['age', 40]]));
// => objects for ['fred', 'barney']
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_findcollection-predicate_identity"></a>`_.find(collection, [predicat <h3 id="_findcollection-predicate_identity-fromindex0"><code>_.find(collection,
e=_.identity])` [predicate=_.identity], [fromIndex=0])</code></h3>
<a href="#_findcollection-predicate_identity">#</a> [&#x24C8;](https://github.co [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L9280 "View i
m/lodash/lodash/blob/4.0.0/lodash.js#L7417 "View in source") [&#x24C9;][1] [&#x2 n source") [&#x24C3;](https://www.npmjs.com/package/lodash.find "See the npm pac
4C3;](https://www.npmjs.com/package/lodash.find "See the npm package") kage") [&#x24C9;][1]
Iterates over elements of `collection`, returning the first element Iterates over elements of `collection`, returning the first element
`predicate` returns truthy for. The predicate is invoked with three arguments:<b `predicate` returns truthy for. The predicate is invoked with three
r> arguments: *(value, index|key, collection)*.
(value, index|key, collection).
#### Since
0.1.0
#### Arguments #### Arguments
1. `collection` *(Array|Object)*: The collection to search. 1. `collection` *(Array|Object)*: The collection to inspect.
2. `[predicate=_.identity]` *(Function|Object|string)*: The function invoked per 2. `[predicate=_.identity]` *(Function)*: The function invoked per iteration.
iteration. 3. `[fromIndex=0]` *(number)*: The index to search from.
#### Returns #### Returns
*(&#42;)*: Returns the matched element, else `undefined`. *(&#42;)*: Returns the matched element, else `undefined`.
#### Example #### Example
```js ```js
var users = [ var users = [
{ 'user': 'barney', 'age': 36, 'active': true }, { 'user': 'barney', 'age': 36, 'active': true },
{ 'user': 'fred', 'age': 40, 'active': false }, { 'user': 'fred', 'age': 40, 'active': false },
{ 'user': 'pebbles', 'age': 1, 'active': true } { 'user': 'pebbles', 'age': 1, 'active': true }
]; ];
_.find(users, function(o) { return o.age < 40; }); _.find(users, function(o) { return o.age < 40; });
// => object for 'barney' // => object for 'barney'
// using the `_.matches` iteratee shorthand // The `_.matches` iteratee shorthand.
_.find(users, { 'age': 1, 'active': true }); _.find(users, { 'age': 1, 'active': true });
// => object for 'pebbles' // => object for 'pebbles'
// using the `_.matchesProperty` iteratee shorthand // The `_.matchesProperty` iteratee shorthand.
_.find(users, ['active', false]); _.find(users, ['active', false]);
// => object for 'fred' // => object for 'fred'
// using the `_.property` iteratee shorthand // The `_.property` iteratee shorthand.
_.find(users, 'active'); _.find(users, 'active');
// => object for 'barney' // => object for 'barney'
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_findlastcollection-predicate_identity"></a>`_.findLast(collection, [ <h3 id="_findlastcollection-predicate_identity-fromindexcollectionlength-1"><cod
predicate=_.identity])` e>_.findLast(collection, [predicate=_.identity], [fromIndex=collection.length-1]
<a href="#_findlastcollection-predicate_identity">#</a> [&#x24C8;](https://githu )</code></h3>
b.com/lodash/lodash/blob/4.0.0/lodash.js#L7443 "View in source") [&#x24C9;][1] [ [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L9301 "View i
&#x24C3;](https://www.npmjs.com/package/lodash.findlast "See the npm package") n source") [&#x24C3;](https://www.npmjs.com/package/lodash.findlast "See the npm
package") [&#x24C9;][1]
This method is like `_.find` except that it iterates over elements of This method is like `_.find` except that it iterates over elements of
`collection` from right to left. `collection` from right to left.
#### Since
2.0.0
#### Arguments #### Arguments
1. `collection` *(Array|Object)*: The collection to search. 1. `collection` *(Array|Object)*: The collection to inspect.
2. `[predicate=_.identity]` *(Function|Object|string)*: The function invoked per 2. `[predicate=_.identity]` *(Function)*: The function invoked per iteration.
iteration. 3. `[fromIndex=collection.length-1]` *(number)*: The index to search from.
#### Returns #### Returns
*(&#42;)*: Returns the matched element, else `undefined`. *(&#42;)*: Returns the matched element, else `undefined`.
#### Example #### Example
```js ```js
_.findLast([1, 2, 3, 4], function(n) { _.findLast([1, 2, 3, 4], function(n) {
return n % 2 == 1; return n % 2 == 1;
}); });
// => 3 // => 3
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_foreachcollection-iteratee_identity"></a>`_.forEach(collection, [ite <h3 id="_flatmapcollection-iteratee_identity"><code>_.flatMap(collection, [itera
ratee=_.identity])` tee=_.identity])</code></h3>
<a href="#_foreachcollection-iteratee_identity">#</a> [&#x24C8;](https://github. [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L9324 "View i
com/lodash/lodash/blob/4.0.0/lodash.js#L7480 "View in source") [&#x24C9;][1] [&# n source") [&#x24C3;](https://www.npmjs.com/package/lodash.flatmap "See the npm
x24C3;](https://www.npmjs.com/package/lodash.foreach "See the npm package") package") [&#x24C9;][1]
Creates a flattened array of values by running each element in `collection`
thru `iteratee` and flattening the mapped results. The iteratee is invoked
with three arguments: *(value, index|key, collection)*.
#### Since
4.0.0
#### Arguments
1. `collection` *(Array|Object)*: The collection to iterate over.
2. `[iteratee=_.identity]` *(Function)*: The function invoked per iteration.
#### Returns
*(Array)*: Returns the new flattened array.
#### Example
```js
function duplicate(n) {
return [n, n];
}
_.flatMap([1, 2], duplicate);
// => [1, 1, 2, 2]
```
---
<!-- /div -->
<!-- div -->
<h3 id="_flatmapdeepcollection-iteratee_identity"><code>_.flatMapDeep(collection
, [iteratee=_.identity])</code></h3>
[&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L9348 "View i
n source") [&#x24C3;](https://www.npmjs.com/package/lodash.flatmapdeep "See the
npm package") [&#x24C9;][1]
This method is like `_.flatMap` except that it recursively flattens the
mapped results.
#### Since
4.7.0
#### Arguments
1. `collection` *(Array|Object)*: The collection to iterate over.
2. `[iteratee=_.identity]` *(Function)*: The function invoked per iteration.
#### Returns
*(Array)*: Returns the new flattened array.
#### Example
```js
function duplicate(n) {
return [[[n, n]]];
}
Iterates over elements of `collection` invoking `iteratee` for each element. _.flatMapDeep([1, 2], duplicate);
The iteratee is invoked with three arguments: (value, index|key, collection). // => [1, 1, 2, 2]
```
---
<!-- /div -->
<!-- div -->
<h3 id="_flatmapdepthcollection-iteratee_identity-depth1"><code>_.flatMapDepth(c
ollection, [iteratee=_.identity], [depth=1])</code></h3>
[&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L9373 "View i
n source") [&#x24C3;](https://www.npmjs.com/package/lodash.flatmapdepth "See the
npm package") [&#x24C9;][1]
This method is like `_.flatMap` except that it recursively flattens the
mapped results up to `depth` times.
#### Since
4.7.0
#### Arguments
1. `collection` *(Array|Object)*: The collection to iterate over.
2. `[iteratee=_.identity]` *(Function)*: The function invoked per iteration.
3. `[depth=1]` *(number)*: The maximum recursion depth.
#### Returns
*(Array)*: Returns the new flattened array.
#### Example
```js
function duplicate(n) {
return [[[n, n]]];
}
_.flatMapDepth([1, 2], duplicate, 2);
// => [[1, 1], [2, 2]]
```
---
<!-- /div -->
<!-- div -->
<h3 id="_foreachcollection-iteratee_identity"><code>_.forEach(collection, [itera
tee=_.identity])</code></h3>
[&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L9408 "View i
n source") [&#x24C3;](https://www.npmjs.com/package/lodash.foreach "See the npm
package") [&#x24C9;][1]
Iterates over elements of `collection` and invokes `iteratee` for each element.
The iteratee is invoked with three arguments: *(value, index|key, collection)*.
Iteratee functions may exit iteration early by explicitly returning `false`. Iteratee functions may exit iteration early by explicitly returning `false`.
<br> <br>
<br> <br>
**Note:** As with other "Collections" methods, objects with a "length" property **Note:** As with other "Collections" methods, objects with a "length"
are iterated like arrays. To avoid this behavior use `_.forIn` or `_.forOwn` property are iterated like arrays. To avoid this behavior use `_.forIn`
for object iteration. or `_.forOwn` for object iteration.
#### Since
0.1.0
#### Aliases #### Aliases
*_.each* *_.each*
#### Arguments #### Arguments
1. `collection` *(Array|Object)*: The collection to iterate over. 1. `collection` *(Array|Object)*: The collection to iterate over.
2. `[iteratee=_.identity]` *(Function)*: The function invoked per iteration. 2. `[iteratee=_.identity]` *(Function)*: The function invoked per iteration.
#### Returns #### Returns
*(Array|Object)*: Returns `collection`. *(&#42;)*: Returns `collection`.
#### Example #### Example
```js ```js
_([1, 2]).forEach(function(value) { _.forEach([1, 2], function(value) {
console.log(value); console.log(value);
}); });
// => logs `1` then `2` // => Logs `1` then `2`.
_.forEach({ 'a': 1, 'b': 2 }, function(value, key) { _.forEach({ 'a': 1, 'b': 2 }, function(value, key) {
console.log(key); console.log(key);
}); });
// => logs 'a' then 'b' (iteration order is not guaranteed) // => Logs 'a' then 'b' (iteration order is not guaranteed).
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_foreachrightcollection-iteratee_identity"></a>`_.forEachRight(collec <h3 id="_foreachrightcollection-iteratee_identity"><code>_.forEachRight(collecti
tion, [iteratee=_.identity])` on, [iteratee=_.identity])</code></h3>
<a href="#_foreachrightcollection-iteratee_identity">#</a> [&#x24C8;](https://gi [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L9433 "View i
thub.com/lodash/lodash/blob/4.0.0/lodash.js#L7504 "View in source") [&#x24C9;][1 n source") [&#x24C3;](https://www.npmjs.com/package/lodash.foreachright "See the
] [&#x24C3;](https://www.npmjs.com/package/lodash.foreachright "See the npm pack npm package") [&#x24C9;][1]
age")
This method is like `_.forEach` except that it iterates over elements of This method is like `_.forEach` except that it iterates over elements of
`collection` from right to left. `collection` from right to left.
#### Since
2.0.0
#### Aliases #### Aliases
*_.eachRight* *_.eachRight*
#### Arguments #### Arguments
1. `collection` *(Array|Object)*: The collection to iterate over. 1. `collection` *(Array|Object)*: The collection to iterate over.
2. `[iteratee=_.identity]` *(Function)*: The function invoked per iteration. 2. `[iteratee=_.identity]` *(Function)*: The function invoked per iteration.
#### Returns #### Returns
*(Array|Object)*: Returns `collection`. *(&#42;)*: Returns `collection`.
#### Example #### Example
```js ```js
_.forEachRight([1, 2], function(value) { _.forEachRight([1, 2], function(value) {
console.log(value); console.log(value);
}); });
// => logs `2` then `1` // => Logs `2` then `1`.
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_groupbycollection-iteratee_identity"></a>`_.groupBy(collection, [ite <h3 id="_groupbycollection-iteratee_identity"><code>_.groupBy(collection, [itera
ratee=_.identity])` tee=_.identity])</code></h3>
<a href="#_groupbycollection-iteratee_identity">#</a> [&#x24C8;](https://github. [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L9461 "View i
com/lodash/lodash/blob/4.0.0/lodash.js#L7531 "View in source") [&#x24C9;][1] [&# n source") [&#x24C3;](https://www.npmjs.com/package/lodash.groupby "See the npm
x24C3;](https://www.npmjs.com/package/lodash.groupby "See the npm package") package") [&#x24C9;][1]
Creates an object composed of keys generated from the results of running Creates an object composed of keys generated from the results of running
each element of `collection` through `iteratee`. The corresponding value each element of `collection` thru `iteratee`. The order of grouped values
of each key is an array of the elements responsible for generating the key. is determined by the order they occur in `collection`. The corresponding
The iteratee is invoked with one argument: (value). value of each key is an array of elements responsible for generating the
key. The iteratee is invoked with one argument: *(value)*.
#### Since
0.1.0
#### Arguments #### Arguments
1. `collection` *(Array|Object)*: The collection to iterate over. 1. `collection` *(Array|Object)*: The collection to iterate over.
2. `[iteratee=_.identity]` *(Function|Object|string)*: The iteratee invoked per element. 2. `[iteratee=_.identity]` *(Function)*: The iteratee to transform keys.
#### Returns #### Returns
*(Object)*: Returns the composed aggregate object. *(Object)*: Returns the composed aggregate object.
#### Example #### Example
```js ```js
_.groupBy([6.1, 4.2, 6.3], Math.floor); _.groupBy([6.1, 4.2, 6.3], Math.floor);
// => { '4': [4.2], '6': [6.1, 6.3] } // => { '4': [4.2], '6': [6.1, 6.3] }
// using the `_.property` iteratee shorthand // The `_.property` iteratee shorthand.
_.groupBy(['one', 'two', 'three'], 'length'); _.groupBy(['one', 'two', 'three'], 'length');
// => { '3': ['one', 'two'], '5': ['three'] } // => { '3': ['one', 'two'], '5': ['three'] }
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_includescollection-value-fromindex0"></a>`_.includes(collection, val <h3 id="_includescollection-value-fromindex0"><code>_.includes(collection, value
ue, [fromIndex=0])` , [fromIndex=0])</code></h3>
<a href="#_includescollection-value-fromindex0">#</a> [&#x24C8;](https://github. [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L9499 "View i
com/lodash/lodash/blob/4.0.0/lodash.js#L7567 "View in source") [&#x24C9;][1] [&# n source") [&#x24C3;](https://www.npmjs.com/package/lodash.includes "See the npm
x24C3;](https://www.npmjs.com/package/lodash.includes "See the npm package") package") [&#x24C9;][1]
Checks if `value` is in `collection`. If `collection` is a string it's checked Checks if `value` is in `collection`. If `collection` is a string, it's
for a substring of `value`, otherwise [`SameValueZero`](http://ecma-internationa checked for a substring of `value`, otherwise
l.org/ecma-262/6.0/#sec-samevaluezero) [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
is used for equality comparisons. If `fromIndex` is negative, it's used as is used for equality comparisons. If `fromIndex` is negative, it's used as
the offset from the end of `collection`. the offset from the end of `collection`.
#### Since
0.1.0
#### Arguments #### Arguments
1. `collection` *(Array|Object|string)*: The collection to search. 1. `collection` *(Array|Object|string)*: The collection to inspect.
2. `value` *(&#42;)*: The value to search for. 2. `value` *(&#42;)*: The value to search for.
3. `[fromIndex=0]` *(number)*: The index to search from. 3. `[fromIndex=0]` *(number)*: The index to search from.
#### Returns #### Returns
*(boolean)*: Returns `true` if `value` is found, else `false`. *(boolean)*: Returns `true` if `value` is found, else `false`.
#### Example #### Example
```js ```js
_.includes([1, 2, 3], 1); _.includes([1, 2, 3], 1);
// => true // => true
_.includes([1, 2, 3], 1, 2); _.includes([1, 2, 3], 1, 2);
// => false // => false
_.includes({ 'user': 'fred', 'age': 40 }, 'fred'); _.includes({ 'a': 1, 'b': 2 }, 1);
// => true // => true
_.includes('pebbles', 'eb'); _.includes('abcd', 'bc');
// => true // => true
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_invokemapcollection-path-args"></a>`_.invokeMap(collection, path, [a <h3 id="_invokemapcollection-path-args"><code>_.invokeMap(collection, path, [arg
rgs])` s])</code></h3>
<a href="#_invokemapcollection-path-args">#</a> [&#x24C8;](https://github.com/lo [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L9535 "View i
dash/lodash/blob/4.0.0/lodash.js#L7602 "View in source") [&#x24C9;][1] [&#x24C3; n source") [&#x24C3;](https://www.npmjs.com/package/lodash.invokemap "See the np
](https://www.npmjs.com/package/lodash.invokemap "See the npm package") m package") [&#x24C9;][1]
Invokes the method at `path` of each element in `collection`, returning Invokes the method at `path` of each element in `collection`, returning
an array of the results of each invoked method. Any additional arguments an array of the results of each invoked method. Any additional arguments
are provided to each invoked method. If `methodName` is a function it's are provided to each invoked method. If `path` is a function, it's invoked
invoked for, and `this` bound to, each element in `collection`. for, and `this` bound to, each element in `collection`.
#### Since
4.0.0
#### Arguments #### Arguments
1. `collection` *(Array|Object)*: The collection to iterate over. 1. `collection` *(Array|Object)*: The collection to iterate over.
2. `path` *(Array|Function|string)*: The path of the method to invoke or the fun ction invoked per iteration. 2. `path` *(Array|Function|string)*: The path of the method to invoke or the fun ction invoked per iteration.
3. `[args]` *(...&#42;)*: The arguments to invoke each method with. 3. `[args]` *(...&#42;)*: The arguments to invoke each method with.
#### Returns #### Returns
*(Array)*: Returns the array of results. *(Array)*: Returns the array of results.
#### Example #### Example
```js ```js
_.invokeMap([[5, 1, 7], [3, 2, 1]], 'sort'); _.invokeMap([[5, 1, 7], [3, 2, 1]], 'sort');
// => [[1, 5, 7], [1, 2, 3]] // => [[1, 5, 7], [1, 2, 3]]
_.invokeMap([123, 456], String.prototype.split, ''); _.invokeMap([123, 456], String.prototype.split, '');
// => [['1', '2', '3'], ['4', '5', '6']] // => [['1', '2', '3'], ['4', '5', '6']]
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_keybycollection-iteratee_identity"></a>`_.keyBy(collection, [iterate <h3 id="_keybycollection-iteratee_identity"><code>_.keyBy(collection, [iteratee=
e=_.identity])` _.identity])</code></h3>
<a href="#_keybycollection-iteratee_identity">#</a> [&#x24C8;](https://github.co [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L9574 "View i
m/lodash/lodash/blob/4.0.0/lodash.js#L7642 "View in source") [&#x24C9;][1] [&#x2 n source") [&#x24C3;](https://www.npmjs.com/package/lodash.keyby "See the npm pa
4C3;](https://www.npmjs.com/package/lodash.keyby "See the npm package") ckage") [&#x24C9;][1]
Creates an object composed of keys generated from the results of running Creates an object composed of keys generated from the results of running
each element of `collection` through `iteratee`. The corresponding value each element of `collection` thru `iteratee`. The corresponding value of
of each key is the last element responsible for generating the key. The each key is the last element responsible for generating the key. The
iteratee is invoked with one argument: (value). iteratee is invoked with one argument: *(value)*.
#### Since
4.0.0
#### Arguments #### Arguments
1. `collection` *(Array|Object)*: The collection to iterate over. 1. `collection` *(Array|Object)*: The collection to iterate over.
2. `[iteratee=_.identity]` *(Function|Object|string)*: The iteratee invoked per element. 2. `[iteratee=_.identity]` *(Function)*: The iteratee to transform keys.
#### Returns #### Returns
*(Object)*: Returns the composed aggregate object. *(Object)*: Returns the composed aggregate object.
#### Example #### Example
```js ```js
var keyData = [ var array = [
{ 'dir': 'left', 'code': 97 }, { 'dir': 'left', 'code': 97 },
{ 'dir': 'right', 'code': 100 } { 'dir': 'right', 'code': 100 }
]; ];
_.keyBy(keyData, 'dir'); _.keyBy(array, function(o) {
// => { 'left': { 'dir': 'left', 'code': 97 }, 'right': { 'dir': 'right', 'code'
: 100 } }
_.keyBy(keyData, function(o) {
return String.fromCharCode(o.code); return String.fromCharCode(o.code);
}); });
// => { 'a': { 'dir': 'left', 'code': 97 }, 'd': { 'dir': 'right', 'code': 100 } } // => { 'a': { 'dir': 'left', 'code': 97 }, 'd': { 'dir': 'right', 'code': 100 } }
_.keyBy(array, 'dir');
// => { 'left': { 'dir': 'left', 'code': 97 }, 'right': { 'dir': 'right', 'code'
: 100 } }
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_mapcollection-iteratee_identity"></a>`_.map(collection, [iteratee=_. <h3 id="_mapcollection-iteratee_identity"><code>_.map(collection, [iteratee=_.id
identity])` entity])</code></h3>
<a href="#_mapcollection-iteratee_identity">#</a> [&#x24C8;](https://github.com/ [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L9620 "View i
lodash/lodash/blob/4.0.0/lodash.js#L7687 "View in source") [&#x24C9;][1] [&#x24C n source") [&#x24C3;](https://www.npmjs.com/package/lodash.map "See the npm pack
3;](https://www.npmjs.com/package/lodash.map "See the npm package") age") [&#x24C9;][1]
Creates an array of values by running each element in `collection` through Creates an array of values by running each element in `collection` thru
`iteratee`. The iteratee is invoked with three arguments:<br> `iteratee`. The iteratee is invoked with three arguments:<br>
(value, index|key, collection). *(value, index|key, collection)*.
<br> <br>
<br> <br>
Many lodash methods are guarded to work as iteratees for methods like Many lodash methods are guarded to work as iteratees for methods like
`_.every`, `_.filter`, `_.map`, `_.mapValues`, `_.reject`, and `_.some`. `_.every`, `_.filter`, `_.map`, `_.mapValues`, `_.reject`, and `_.some`.
<br> <br>
<br> <br>
The guarded methods are:<br> The guarded methods are:<br>
`ary`, `curry`, `curryRight`, `drop`, `dropRight`, `every`, `fill`, `ary`, `chunk`, `curry`, `curryRight`, `drop`, `dropRight`, `every`,
`invert`, `parseInt`, `random`, `range`, `rangeRight`, `slice`, `some`, `fill`, `invert`, `parseInt`, `random`, `range`, `rangeRight`, `repeat`,
`sortBy`, `take`, `takeRight`, `template`, `trim`, `trimEnd`, `trimStart`, `sampleSize`, `slice`, `some`, `sortBy`, `split`, `take`, `takeRight`,
and `words` `template`, `trim`, `trimEnd`, `trimStart`, and `words`
#### Since
0.1.0
#### Arguments #### Arguments
1. `collection` *(Array|Object)*: The collection to iterate over. 1. `collection` *(Array|Object)*: The collection to iterate over.
2. `[iteratee=_.identity]` *(Function|Object|string)*: The function invoked per iteration. 2. `[iteratee=_.identity]` *(Function)*: The function invoked per iteration.
#### Returns #### Returns
*(Array)*: Returns the new mapped array. *(Array)*: Returns the new mapped array.
#### Example #### Example
```js ```js
function square(n) { function square(n) {
return n * n; return n * n;
} }
_.map([1, 2], square); _.map([4, 8], square);
// => [3, 6] // => [16, 64]
_.map({ 'a': 1, 'b': 2 }, square); _.map({ 'a': 4, 'b': 8 }, square);
// => [3, 6] (iteration order is not guaranteed) // => [16, 64] (iteration order is not guaranteed)
var users = [ var users = [
{ 'user': 'barney' }, { 'user': 'barney' },
{ 'user': 'fred' } { 'user': 'fred' }
]; ];
// using the `_.property` iteratee shorthand // The `_.property` iteratee shorthand.
_.map(users, 'user'); _.map(users, 'user');
// => ['barney', 'fred'] // => ['barney', 'fred']
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_orderbycollection-iteratees-_identity-orders"></a>`_.orderBy(collect <h3 id="_orderbycollection-iteratees_identity-orders"><code>_.orderBy(collection
ion, [iteratees=[_.identity]], [orders])` , [iteratees=[_.identity]], [orders])</code></h3>
<a href="#_orderbycollection-iteratees-_identity-orders">#</a> [&#x24C8;](https: [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L9654 "View i
//github.com/lodash/lodash/blob/4.0.0/lodash.js#L7719 "View in source") [&#x24C9 n source") [&#x24C3;](https://www.npmjs.com/package/lodash.orderby "See the npm
;][1] [&#x24C3;](https://www.npmjs.com/package/lodash.orderby "See the npm packa package") [&#x24C9;][1]
ge")
This method is like `_.sortBy` except that it allows specifying the sort This method is like `_.sortBy` except that it allows specifying the sort
orders of the iteratees to sort by. If `orders` is unspecified, all values orders of the iteratees to sort by. If `orders` is unspecified, all values
are sorted in ascending order. Otherwise, specify an order of "desc" for are sorted in ascending order. Otherwise, specify an order of "desc" for
descending or "asc" for ascending sort order of corresponding values. descending or "asc" for ascending sort order of corresponding values.
#### Since
4.0.0
#### Arguments #### Arguments
1. `collection` *(Array|Object)*: The collection to iterate over. 1. `collection` *(Array|Object)*: The collection to iterate over.
2. `[iteratees=[_.identity]]` *(Function&#91;&#93;|Object&#91;&#93;|string&#91;& #93;)*: The iteratees to sort by. 2. `[iteratees=[_.identity]]` *(Array&#91;&#93;|Function&#91;&#93;|Object&#91;&# 93;|string&#91;&#93;)*: The iteratees to sort by.
3. `[orders]` *(string&#91;&#93;)*: The sort orders of `iteratees`. 3. `[orders]` *(string&#91;&#93;)*: The sort orders of `iteratees`.
#### Returns #### Returns
*(Array)*: Returns the new sorted array. *(Array)*: Returns the new sorted array.
#### Example #### Example
```js ```js
var users = [ var users = [
{ 'user': 'fred', 'age': 48 }, { 'user': 'fred', 'age': 48 },
{ 'user': 'barney', 'age': 34 }, { 'user': 'barney', 'age': 34 },
{ 'user': 'fred', 'age': 42 }, { 'user': 'fred', 'age': 40 },
{ 'user': 'barney', 'age': 36 } { 'user': 'barney', 'age': 36 }
]; ];
// sort by `user` in ascending order and by `age` in descending order // Sort by `user` in ascending order and by `age` in descending order.
_.orderBy(users, ['user', 'age'], ['asc', 'desc']); _.orderBy(users, ['user', 'age'], ['asc', 'desc']);
// => objects for [['barney', 36], ['barney', 34], ['fred', 48], ['fred', 42]] // => objects for [['barney', 36], ['barney', 34], ['fred', 48], ['fred', 40]]
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_partitioncollection-predicate_identity"></a>`_.partition(collection, <h3 id="_partitioncollection-predicate_identity"><code>_.partition(collection, [
[predicate=_.identity])` predicate=_.identity])</code></h3>
<a href="#_partitioncollection-predicate_identity">#</a> [&#x24C8;](https://gith [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L9704 "View i
ub.com/lodash/lodash/blob/4.0.0/lodash.js#L7768 "View in source") [&#x24C9;][1] n source") [&#x24C3;](https://www.npmjs.com/package/lodash.partition "See the np
[&#x24C3;](https://www.npmjs.com/package/lodash.partition "See the npm package") m package") [&#x24C9;][1]
Creates an array of elements split into two groups, the first of which Creates an array of elements split into two groups, the first of which
contains elements `predicate` returns truthy for, while the second of which contains elements `predicate` returns truthy for, the second of which
contains elements `predicate` returns falsey for. The predicate is invoked contains elements `predicate` returns falsey for. The predicate is
with three arguments: (value, index|key, collection). invoked with one argument: *(value)*.
#### Since
3.0.0
#### Arguments #### Arguments
1. `collection` *(Array|Object)*: The collection to iterate over. 1. `collection` *(Array|Object)*: The collection to iterate over.
2. `[predicate=_.identity]` *(Function|Object|string)*: The function invoked per iteration. 2. `[predicate=_.identity]` *(Function)*: The function invoked per iteration.
#### Returns #### Returns
*(Array)*: Returns the array of grouped elements. *(Array)*: Returns the array of grouped elements.
#### Example #### Example
```js ```js
var users = [ var users = [
{ 'user': 'barney', 'age': 36, 'active': false }, { 'user': 'barney', 'age': 36, 'active': false },
{ 'user': 'fred', 'age': 40, 'active': true }, { 'user': 'fred', 'age': 40, 'active': true },
{ 'user': 'pebbles', 'age': 1, 'active': false } { 'user': 'pebbles', 'age': 1, 'active': false }
]; ];
_.partition(users, function(o) { return o.active; }); _.partition(users, function(o) { return o.active; });
// => objects for [['fred'], ['barney', 'pebbles']] // => objects for [['fred'], ['barney', 'pebbles']]
// using the `_.matches` iteratee shorthand // The `_.matches` iteratee shorthand.
_.partition(users, { 'age': 1, 'active': false }); _.partition(users, { 'age': 1, 'active': false });
// => objects for [['pebbles'], ['barney', 'fred']] // => objects for [['pebbles'], ['barney', 'fred']]
// using the `_.matchesProperty` iteratee shorthand // The `_.matchesProperty` iteratee shorthand.
_.partition(users, ['active', false]); _.partition(users, ['active', false]);
// => objects for [['barney', 'pebbles'], ['fred']] // => objects for [['barney', 'pebbles'], ['fred']]
// using the `_.property` iteratee shorthand // The `_.property` iteratee shorthand.
_.partition(users, 'active'); _.partition(users, 'active');
// => objects for [['fred'], ['barney', 'pebbles']] // => objects for [['fred'], ['barney', 'pebbles']]
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_reducecollection-iteratee_identity-accumulator"></a>`_.reduce(collec <h3 id="_reducecollection-iteratee_identity-accumulator"><code>_.reduce(collecti
tion, [iteratee=_.identity], [accumulator])` on, [iteratee=_.identity], [accumulator])</code></h3>
<a href="#_reducecollection-iteratee_identity-accumulator">#</a> [&#x24C8;](http [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L9745 "View i
s://github.com/lodash/lodash/blob/4.0.0/lodash.js#L7807 "View in source") [&#x24 n source") [&#x24C3;](https://www.npmjs.com/package/lodash.reduce "See the npm p
C9;][1] [&#x24C3;](https://www.npmjs.com/package/lodash.reduce "See the npm pack ackage") [&#x24C9;][1]
age")
Reduces `collection` to a value which is the accumulated result of running Reduces `collection` to a value which is the accumulated result of running
each element in `collection` through `iteratee`, where each successive each element in `collection` thru `iteratee`, where each successive
invocation is supplied the return value of the previous. If `accumulator` invocation is supplied the return value of the previous. If `accumulator`
is not provided the first element of `collection` is used as the initial is not given, the first element of `collection` is used as the initial
value. The iteratee is invoked with four arguments:<br> value. The iteratee is invoked with four arguments:<br>
(accumulator, value, index|key, collection). *(accumulator, value, index|key, collection)*.
<br> <br>
<br> <br>
Many lodash methods are guarded to work as iteratees for methods like Many lodash methods are guarded to work as iteratees for methods like
`_.reduce`, `_.reduceRight`, and `_.transform`. `_.reduce`, `_.reduceRight`, and `_.transform`.
<br> <br>
<br> <br>
The guarded methods are:<br> The guarded methods are:<br>
`assign`, `defaults`, `defaultsDeep`, `includes`, `merge`, `orderBy`, `assign`, `defaults`, `defaultsDeep`, `includes`, `merge`, `orderBy`,
and `sortBy` and `sortBy`
#### Since
0.1.0
#### Arguments #### Arguments
1. `collection` *(Array|Object)*: The collection to iterate over. 1. `collection` *(Array|Object)*: The collection to iterate over.
2. `[iteratee=_.identity]` *(Function)*: The function invoked per iteration. 2. `[iteratee=_.identity]` *(Function)*: The function invoked per iteration.
3. `[accumulator]` *(&#42;)*: The initial value. 3. `[accumulator]` *(&#42;)*: The initial value.
#### Returns #### Returns
*(&#42;)*: Returns the accumulated value. *(&#42;)*: Returns the accumulated value.
#### Example #### Example
```js ```js
_.reduce([1, 2], function(sum, n) { _.reduce([1, 2], function(sum, n) {
return sum + n; return sum + n;
}); }, 0);
// => 3 // => 3
_.reduce({ 'a': 1, 'b': 2, 'c': 1 }, function(result, value, key) { _.reduce({ 'a': 1, 'b': 2, 'c': 1 }, function(result, value, key) {
(result[value] || (result[value] = [])).push(key); (result[value] || (result[value] = [])).push(key);
return result; return result;
}, {}); }, {});
// => { '1': ['a', 'c'], '2': ['b'] } (iteration order is not guaranteed) // => { '1': ['a', 'c'], '2': ['b'] } (iteration order is not guaranteed)
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_reducerightcollection-iteratee_identity-accumulator"></a>`_.reduceRi <h3 id="_reducerightcollection-iteratee_identity-accumulator"><code>_.reduceRigh
ght(collection, [iteratee=_.identity], [accumulator])` t(collection, [iteratee=_.identity], [accumulator])</code></h3>
<a href="#_reducerightcollection-iteratee_identity-accumulator">#</a> [&#x24C8;] [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L9774 "View i
(https://github.com/lodash/lodash/blob/4.0.0/lodash.js#L7834 "View in source") [ n source") [&#x24C3;](https://www.npmjs.com/package/lodash.reduceright "See the
&#x24C9;][1] [&#x24C3;](https://www.npmjs.com/package/lodash.reduceright "See th npm package") [&#x24C9;][1]
e npm package")
This method is like `_.reduce` except that it iterates over elements of This method is like `_.reduce` except that it iterates over elements of
`collection` from right to left. `collection` from right to left.
#### Since
0.1.0
#### Arguments #### Arguments
1. `collection` *(Array|Object)*: The collection to iterate over. 1. `collection` *(Array|Object)*: The collection to iterate over.
2. `[iteratee=_.identity]` *(Function)*: The function invoked per iteration. 2. `[iteratee=_.identity]` *(Function)*: The function invoked per iteration.
3. `[accumulator]` *(&#42;)*: The initial value. 3. `[accumulator]` *(&#42;)*: The initial value.
#### Returns #### Returns
*(&#42;)*: Returns the accumulated value. *(&#42;)*: Returns the accumulated value.
#### Example #### Example
```js ```js
var array = [[0, 1], [2, 3], [4, 5]]; var array = [[0, 1], [2, 3], [4, 5]];
_.reduceRight(array, function(flattened, other) { _.reduceRight(array, function(flattened, other) {
return flattened.concat(other); return flattened.concat(other);
}, []); }, []);
// => [4, 5, 2, 3, 0, 1] // => [4, 5, 2, 3, 0, 1]
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_rejectcollection-predicate_identity"></a>`_.reject(collection, [pred <h3 id="_rejectcollection-predicate_identity"><code>_.reject(collection, [predic
icate=_.identity])` ate=_.identity])</code></h3>
<a href="#_rejectcollection-predicate_identity">#</a> [&#x24C8;](https://github. [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L9815 "View i
com/lodash/lodash/blob/4.0.0/lodash.js#L7873 "View in source") [&#x24C9;][1] [&# n source") [&#x24C3;](https://www.npmjs.com/package/lodash.reject "See the npm p
x24C3;](https://www.npmjs.com/package/lodash.reject "See the npm package") ackage") [&#x24C9;][1]
The opposite of `_.filter`; this method returns the elements of `collection` The opposite of `_.filter`; this method returns the elements of `collection`
that `predicate` does **not** return truthy for. that `predicate` does **not** return truthy for.
#### Since
0.1.0
#### Arguments #### Arguments
1. `collection` *(Array|Object)*: The collection to iterate over. 1. `collection` *(Array|Object)*: The collection to iterate over.
2. `[predicate=_.identity]` *(Function|Object|string)*: The function invoked per iteration. 2. `[predicate=_.identity]` *(Function)*: The function invoked per iteration.
#### Returns #### Returns
*(Array)*: Returns the new filtered array. *(Array)*: Returns the new filtered array.
#### Example #### Example
```js ```js
var users = [ var users = [
{ 'user': 'barney', 'age': 36, 'active': false }, { 'user': 'barney', 'age': 36, 'active': false },
{ 'user': 'fred', 'age': 40, 'active': true } { 'user': 'fred', 'age': 40, 'active': true }
]; ];
_.reject(users, function(o) { return !o.active; }); _.reject(users, function(o) { return !o.active; });
// => objects for ['fred'] // => objects for ['fred']
// using the `_.matches` iteratee shorthand // The `_.matches` iteratee shorthand.
_.reject(users, { 'age': 40, 'active': true }); _.reject(users, { 'age': 40, 'active': true });
// => objects for ['barney'] // => objects for ['barney']
// using the `_.matchesProperty` iteratee shorthand // The `_.matchesProperty` iteratee shorthand.
_.reject(users, ['active', false]); _.reject(users, ['active', false]);
// => objects for ['fred'] // => objects for ['fred']
// using the `_.property` iteratee shorthand // The `_.property` iteratee shorthand.
_.reject(users, 'active'); _.reject(users, 'active');
// => objects for ['barney'] // => objects for ['barney']
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_samplecollection"></a>`_.sample(collection)` <h3 id="_samplecollection"><code>_.sample(collection)</code></h3>
<a href="#_samplecollection">#</a> [&#x24C8;](https://github.com/lodash/lodash/b [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L9834 "View i
lob/4.0.0/lodash.js#L7894 "View in source") [&#x24C9;][1] [&#x24C3;](https://www n source") [&#x24C3;](https://www.npmjs.com/package/lodash.sample "See the npm p
.npmjs.com/package/lodash.sample "See the npm package") ackage") [&#x24C9;][1]
Gets a random element from `collection`. Gets a random element from `collection`.
#### Since
2.0.0
#### Arguments #### Arguments
1. `collection` *(Array|Object)*: The collection to sample. 1. `collection` *(Array|Object)*: The collection to sample.
#### Returns #### Returns
*(&#42;)*: Returns the random element. *(&#42;)*: Returns the random element.
#### Example #### Example
```js ```js
_.sample([1, 2, 3, 4]); _.sample([1, 2, 3, 4]);
// => 2 // => 2
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_samplesizecollection-n0"></a>`_.sampleSize(collection, [n=0])` <h3 id="_samplesizecollection-n1"><code>_.sampleSize(collection, [n=1])</code></
<a href="#_samplesizecollection-n0">#</a> [&#x24C8;](https://github.com/lodash/l h3>
odash/blob/4.0.0/lodash.js#L7915 "View in source") [&#x24C9;][1] [&#x24C3;](http [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L9859 "View i
s://www.npmjs.com/package/lodash.samplesize "See the npm package") n source") [&#x24C3;](https://www.npmjs.com/package/lodash.samplesize "See the n
pm package") [&#x24C9;][1]
Gets `n` random elements at unique keys from `collection` up to the
size of `collection`.
Gets `n` random elements from `collection`. #### Since
4.0.0
#### Arguments #### Arguments
1. `collection` *(Array|Object)*: The collection to sample. 1. `collection` *(Array|Object)*: The collection to sample.
2. `[n=0]` *(number)*: The number of elements to sample. 2. `[n=1]` *(number)*: The number of elements to sample.
#### Returns #### Returns
*(Array)*: Returns the random elements. *(Array)*: Returns the random elements.
#### Example #### Example
```js ```js
_.sampleSize([1, 2, 3, 4], 2); _.sampleSize([1, 2, 3], 2);
// => [3, 1] // => [3, 1]
_.sampleSize([1, 2, 3], 4);
// => [2, 3, 1]
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_shufflecollection"></a>`_.shuffle(collection)` <h3 id="_shufflecollection"><code>_.shuffle(collection)</code></h3>
<a href="#_shufflecollection">#</a> [&#x24C8;](https://github.com/lodash/lodash/ [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L9884 "View i
blob/4.0.0/lodash.js#L7947 "View in source") [&#x24C9;][1] [&#x24C3;](https://ww n source") [&#x24C3;](https://www.npmjs.com/package/lodash.shuffle "See the npm
w.npmjs.com/package/lodash.shuffle "See the npm package") package") [&#x24C9;][1]
Creates an array of shuffled values, using a version of the Creates an array of shuffled values, using a version of the
[Fisher-Yates shuffle](https://en.wikipedia.org/wiki/Fisher-Yates_shuffle). [Fisher-Yates shuffle](https://en.wikipedia.org/wiki/Fisher-Yates_shuffle).
#### Since
0.1.0
#### Arguments #### Arguments
1. `collection` *(Array|Object)*: The collection to shuffle. 1. `collection` *(Array|Object)*: The collection to shuffle.
#### Returns #### Returns
*(Array)*: Returns the new shuffled array. *(Array)*: Returns the new shuffled array.
#### Example #### Example
```js ```js
_.shuffle([1, 2, 3, 4]); _.shuffle([1, 2, 3, 4]);
// => [4, 1, 3, 2] // => [4, 1, 3, 2]
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_sizecollection"></a>`_.size(collection)` <h3 id="_sizecollection"><code>_.size(collection)</code></h3>
<a href="#_sizecollection">#</a> [&#x24C8;](https://github.com/lodash/lodash/blo [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L9910 "View i
b/4.0.0/lodash.js#L7971 "View in source") [&#x24C9;][1] [&#x24C3;](https://www.n n source") [&#x24C3;](https://www.npmjs.com/package/lodash.size "See the npm pac
pmjs.com/package/lodash.size "See the npm package") kage") [&#x24C9;][1]
Gets the size of `collection` by returning its length for array-like Gets the size of `collection` by returning its length for array-like
values or the number of own enumerable properties for objects. values or the number of own enumerable string keyed properties for objects.
#### Since
0.1.0
#### Arguments #### Arguments
1. `collection` *(Array|Object)*: The collection to inspect. 1. `collection` *(Array|Object|string)*: The collection to inspect.
#### Returns #### Returns
*(number)*: Returns the collection size. *(number)*: Returns the collection size.
#### Example #### Example
```js ```js
_.size([1, 2, 3]); _.size([1, 2, 3]);
// => 3 // => 3
_.size({ 'a': 1, 'b': 2 }); _.size({ 'a': 1, 'b': 2 });
// => 2 // => 2
_.size('pebbles'); _.size('pebbles');
// => 7 // => 7
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_somecollection-predicate_identity"></a>`_.some(collection, [predicat <h3 id="_somecollection-predicate_identity"><code>_.some(collection, [predicate=
e=_.identity])` _.identity])</code></h3>
<a href="#_somecollection-predicate_identity">#</a> [&#x24C8;](https://github.co [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L9960 "View i
m/lodash/lodash/blob/4.0.0/lodash.js#L8016 "View in source") [&#x24C9;][1] [&#x2 n source") [&#x24C3;](https://www.npmjs.com/package/lodash.some "See the npm pac
4C3;](https://www.npmjs.com/package/lodash.some "See the npm package") kage") [&#x24C9;][1]
Checks if `predicate` returns truthy for **any** element of `collection`. Checks if `predicate` returns truthy for **any** element of `collection`.
Iteration is stopped once `predicate` returns truthy. The predicate is Iteration is stopped once `predicate` returns truthy. The predicate is
invoked with three arguments: (value, index|key, collection). invoked with three arguments: *(value, index|key, collection)*.
#### Since
0.1.0
#### Arguments #### Arguments
1. `collection` *(Array|Object)*: The collection to iterate over. 1. `collection` *(Array|Object)*: The collection to iterate over.
2. `[predicate=_.identity]` *(Function|Object|string)*: The function invoked per iteration. 2. `[predicate=_.identity]` *(Function)*: The function invoked per iteration.
#### Returns #### Returns
*(boolean)*: Returns `true` if any element passes the predicate check, else `fa lse`. *(boolean)*: Returns `true` if any element passes the predicate check, else `fal se`.
#### Example #### Example
```js ```js
_.some([null, 0, 'yes', false], Boolean); _.some([null, 0, 'yes', false], Boolean);
// => true // => true
var users = [ var users = [
{ 'user': 'barney', 'active': true }, { 'user': 'barney', 'active': true },
{ 'user': 'fred', 'active': false } { 'user': 'fred', 'active': false }
]; ];
// using the `_.matches` iteratee shorthand // The `_.matches` iteratee shorthand.
_.some(users, { 'user': 'barney', 'active': false }); _.some(users, { 'user': 'barney', 'active': false });
// => false // => false
// using the `_.matchesProperty` iteratee shorthand // The `_.matchesProperty` iteratee shorthand.
_.some(users, ['active', false]); _.some(users, ['active', false]);
// => true // => true
// using the `_.property` iteratee shorthand // The `_.property` iteratee shorthand.
_.some(users, 'active'); _.some(users, 'active');
// => true // => true
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_sortbycollection-iteratees-_identity"></a>`_.sortBy(collection, [ite <h3 id="_sortbycollection-iteratees_identity"><code>_.sortBy(collection, [iterat
ratees=[_.identity]])` ees=[_.identity]])</code></h3>
<a href="#_sortbycollection-iteratees-_identity">#</a> [&#x24C8;](https://github [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L9997 "View i
.com/lodash/lodash/blob/4.0.0/lodash.js#L8057 "View in source") [&#x24C9;][1] [& n source") [&#x24C3;](https://www.npmjs.com/package/lodash.sortby "See the npm p
#x24C3;](https://www.npmjs.com/package/lodash.sortby "See the npm package") ackage") [&#x24C9;][1]
Creates an array of elements, sorted in ascending order by the results of Creates an array of elements, sorted in ascending order by the results of
running each element in a collection through each iteratee. This method running each element in a collection thru each iteratee. This method
performs a stable sort, that is, it preserves the original sort order of performs a stable sort, that is, it preserves the original sort order of
equal elements. The iteratees are invoked with one argument: (value). equal elements. The iteratees are invoked with one argument: *(value)*.
#### Since
0.1.0
#### Arguments #### Arguments
1. `collection` *(Array|Object)*: The collection to iterate over. 1. `collection` *(Array|Object)*: The collection to iterate over.
2. `[iteratees=[_.identity]]` *(...(Function|Function&#91;&#93;|Object|Object&#9 1;&#93;|string|string&#91;&#93;)*: The iteratees to sort by, specified individu ally or in arrays. 2. `[iteratees=[_.identity]]` *(...(Function|Function&#91;&#93;))*: The iteratee s to sort by.
#### Returns #### Returns
*(Array)*: Returns the new sorted array. *(Array)*: Returns the new sorted array.
#### Example #### Example
```js ```js
var users = [ var users = [
{ 'user': 'fred', 'age': 48 }, { 'user': 'fred', 'age': 48 },
{ 'user': 'barney', 'age': 36 }, { 'user': 'barney', 'age': 36 },
{ 'user': 'fred', 'age': 42 }, { 'user': 'fred', 'age': 30 },
{ 'user': 'barney', 'age': 34 } { 'user': 'barney', 'age': 34 }
]; ];
_.sortBy(users, function(o) { return o.user; }); _.sortBy(users, [function(o) { return o.user; }]);
// => objects for [['barney', 36], ['barney', 34], ['fred', 48], ['fred', 42]] // => objects for [['barney', 36], ['barney', 34], ['fred', 48], ['fred', 30]]
_.sortBy(users, ['user', 'age']); _.sortBy(users, ['user', 'age']);
// => objects for [['barney', 34], ['barney', 36], ['fred', 42], ['fred', 48]] // => objects for [['barney', 34], ['barney', 36], ['fred', 30], ['fred', 48]]
_.sortBy(users, 'user', function(o) {
return Math.floor(o.age / 10);
});
// => objects for [['barney', 36], ['barney', 34], ['fred', 48], ['fred', 42]]
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
## `“Date” Methods` ## `“Date” Methods`
<!-- div --> <!-- div -->
### <a id="_now"></a>`_.now()` <h3 id="_now"><code>_.now()</code></h3>
<a href="#_now">#</a> [&#x24C8;](https://github.com/lodash/lodash/blob/4.0.0/lod [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L10028 "View
ash.js#L8088 "View in source") [&#x24C9;][1] [&#x24C3;](https://www.npmjs.com/pa in source") [&#x24C3;](https://www.npmjs.com/package/lodash.now "See the npm pac
ckage/lodash.now "See the npm package") kage") [&#x24C9;][1]
Gets the timestamp of the number of milliseconds that have elapsed since Gets the timestamp of the number of milliseconds that have elapsed since
the Unix epoch (1 January 1970 00:00:00 UTC). the Unix epoch *(1 January `1970 00`:00:00 UTC)*.
#### Since
2.4.0
#### Returns #### Returns
*(number)*: Returns the timestamp. *(number)*: Returns the timestamp.
#### Example #### Example
```js ```js
_.defer(function(stamp) { _.defer(function(stamp) {
console.log(_.now() - stamp); console.log(_.now() - stamp);
}, _.now()); }, _.now());
// => logs the number of milliseconds it took for the deferred function to be in voked // => Logs the number of milliseconds it took for the deferred invocation.
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
## `“Function” Methods` ## `“Function” Methods`
<!-- div --> <!-- div -->
### <a id="_aftern-func"></a>`_.after(n, func)` <h3 id="_aftern-func"><code>_.after(n, func)</code></h3>
<a href="#_aftern-func">#</a> [&#x24C8;](https://github.com/lodash/lodash/blob/4 [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L10058 "View
.0.0/lodash.js#L8115 "View in source") [&#x24C9;][1] [&#x24C3;](https://www.npmj in source") [&#x24C3;](https://www.npmjs.com/package/lodash.after "See the npm p
s.com/package/lodash.after "See the npm package") ackage") [&#x24C9;][1]
The opposite of `_.before`; this method creates a function that invokes The opposite of `_.before`; this method creates a function that invokes
`func` once it's called `n` or more times. `func` once it's called `n` or more times.
#### Since
0.1.0
#### Arguments #### Arguments
1. `n` *(number)*: The number of calls before `func` is invoked. 1. `n` *(number)*: The number of calls before `func` is invoked.
2. `func` *(Function)*: The function to restrict. 2. `func` *(Function)*: The function to restrict.
#### Returns #### Returns
*(Function)*: Returns the new restricted function. *(Function)*: Returns the new restricted function.
#### Example #### Example
```js ```js
var saves = ['profile', 'settings']; var saves = ['profile', 'settings'];
var done = _.after(saves.length, function() { var done = _.after(saves.length, function() {
console.log('done saving!'); console.log('done saving!');
}); });
_.forEach(saves, function(type) { _.forEach(saves, function(type) {
asyncSave({ 'type': type, 'complete': done }); asyncSave({ 'type': type, 'complete': done });
}); });
// => logs 'done saving!' after the two async saves have completed // => Logs 'done saving!' after the two async saves have completed.
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_aryfunc-nfunclength"></a>`_.ary(func, [n=func.length])` <h3 id="_aryfunc-nfunclength"><code>_.ary(func, [n=func.length])</code></h3>
<a href="#_aryfunc-nfunclength">#</a> [&#x24C8;](https://github.com/lodash/lodas [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L10087 "View
h/blob/4.0.0/lodash.js#L8143 "View in source") [&#x24C9;][1] [&#x24C3;](https:// in source") [&#x24C3;](https://www.npmjs.com/package/lodash.ary "See the npm pac
www.npmjs.com/package/lodash.ary "See the npm package") kage") [&#x24C9;][1]
Creates a function that accepts up to `n` arguments, ignoring any Creates a function that invokes `func`, with up to `n` arguments,
additional arguments. ignoring any additional arguments.
#### Since
3.0.0
#### Arguments #### Arguments
1. `func` *(Function)*: The function to cap arguments for. 1. `func` *(Function)*: The function to cap arguments for.
2. `[n=func.length]` *(number)*: The arity cap. 2. `[n=func.length]` *(number)*: The arity cap.
#### Returns #### Returns
*(Function)*: Returns the new function. *(Function)*: Returns the new capped function.
#### Example #### Example
```js ```js
_.map(['6', '8', '10'], _.ary(parseInt, 1)); _.map(['6', '8', '10'], _.ary(parseInt, 1));
// => [6, 8, 10] // => [6, 8, 10]
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_beforen-func"></a>`_.before(n, func)` <h3 id="_beforen-func"><code>_.before(n, func)</code></h3>
<a href="#_beforen-func">#</a> [&#x24C8;](https://github.com/lodash/lodash/blob/ [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L10110 "View
4.0.0/lodash.js#L8165 "View in source") [&#x24C9;][1] [&#x24C3;](https://www.npm in source") [&#x24C3;](https://www.npmjs.com/package/lodash.before "See the npm
js.com/package/lodash.before "See the npm package") package") [&#x24C9;][1]
Creates a function that invokes `func`, with the `this` binding and arguments Creates a function that invokes `func`, with the `this` binding and arguments
of the created function, while it's called less than `n` times. Subsequent of the created function, while it's called less than `n` times. Subsequent
calls to the created function return the result of the last `func` invocation. calls to the created function return the result of the last `func` invocation.
#### Since
3.0.0
#### Arguments #### Arguments
1. `n` *(number)*: The number of calls at which `func` is no longer invoked. 1. `n` *(number)*: The number of calls at which `func` is no longer invoked.
2. `func` *(Function)*: The function to restrict. 2. `func` *(Function)*: The function to restrict.
#### Returns #### Returns
*(Function)*: Returns the new restricted function. *(Function)*: Returns the new restricted function.
#### Example #### Example
```js ```js
jQuery(element).on('click', _.before(5, addContactToList)); jQuery(element).on('click', _.before(5, addContactToList));
// => allows adding up to 4 contacts to the list // => Allows adding up to 4 contacts to the list.
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_bindfunc-thisarg-partials"></a>`_.bind(func, thisArg, [partials])` <h3 id="_bindfunc-thisarg-partials"><code>_.bind(func, thisArg, [partials])</cod
<a href="#_bindfunc-thisarg-partials">#</a> [&#x24C8;](https://github.com/lodash e></h3>
/lodash/blob/4.0.0/lodash.js#L8217 "View in source") [&#x24C9;][1] [&#x24C3;](ht [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L10162 "View
tps://www.npmjs.com/package/lodash.bind "See the npm package") in source") [&#x24C3;](https://www.npmjs.com/package/lodash.bind "See the npm pa
ckage") [&#x24C9;][1]
Creates a function that invokes `func` with the `this` binding of `thisArg` Creates a function that invokes `func` with the `this` binding of `thisArg`
and prepends any additional `_.bind` arguments to those provided to the and `partials` prepended to the arguments it receives.
bound function.
<br> <br>
<br> <br>
The `_.bind.placeholder` value, which defaults to `_` in monolithic builds, The `_.bind.placeholder` value, which defaults to `_` in monolithic builds,
may be used as a placeholder for partially applied arguments. may be used as a placeholder for partially applied arguments.
<br> <br>
<br> <br>
**Note:** Unlike native `Function#bind` this method doesn't set the "length" **Note:** Unlike native `Function#bind`, this method doesn't set the "length"
property of bound functions. property of bound functions.
#### Since
0.1.0
#### Arguments #### Arguments
1. `func` *(Function)*: The function to bind. 1. `func` *(Function)*: The function to bind.
2. `thisArg` *(&#42;)*: The `this` binding of `func`. 2. `thisArg` *(&#42;)*: The `this` binding of `func`.
3. `[partials]` *(...&#42;)*: The arguments to be partially applied. 3. `[partials]` *(...&#42;)*: The arguments to be partially applied.
#### Returns #### Returns
*(Function)*: Returns the new bound function. *(Function)*: Returns the new bound function.
#### Example #### Example
```js ```js
var greet = function(greeting, punctuation) { function greet(greeting, punctuation) {
return greeting + ' ' + this.user + punctuation; return greeting + ' ' + this.user + punctuation;
}; }
var object = { 'user': 'fred' }; var object = { 'user': 'fred' };
var bound = _.bind(greet, object, 'hi'); var bound = _.bind(greet, object, 'hi');
bound('!'); bound('!');
// => 'hi fred!' // => 'hi fred!'
// using placeholders // Bound with placeholders.
var bound = _.bind(greet, object, _, '!'); var bound = _.bind(greet, object, _, '!');
bound('hi'); bound('hi');
// => 'hi fred!' // => 'hi fred!'
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_bindkeyobject-key-partials"></a>`_.bindKey(object, key, [partials])` <h3 id="_bindkeyobject-key-partials"><code>_.bindKey(object, key, [partials])</c
<a href="#_bindkeyobject-key-partials">#</a> [&#x24C8;](https://github.com/lodas ode></h3>
h/lodash/blob/4.0.0/lodash.js#L8270 "View in source") [&#x24C9;][1] [&#x24C3;](h [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L10216 "View
ttps://www.npmjs.com/package/lodash.bindkey "See the npm package") in source") [&#x24C3;](https://www.npmjs.com/package/lodash.bindkey "See the npm
package") [&#x24C9;][1]
Creates a function that invokes the method at `object[key]` and prepends Creates a function that invokes the method at `object[key]` with `partials`
any additional `_.bindKey` arguments to those provided to the bound function. prepended to the arguments it receives.
<br> <br>
<br> <br>
This method differs from `_.bind` by allowing bound functions to reference This method differs from `_.bind` by allowing bound functions to reference
methods that may be redefined or don't yet exist. methods that may be redefined or don't yet exist. See
See [Peter Michaux's article](http://peter.michaux.ca/articles/lazy-function-def [Peter Michaux's article](http://peter.michaux.ca/articles/lazy-function-definit
inition-pattern) ion-pattern)
for more details. for more details.
<br> <br>
<br> <br>
The `_.bindKey.placeholder` value, which defaults to `_` in monolithic The `_.bindKey.placeholder` value, which defaults to `_` in monolithic
builds, may be used as a placeholder for partially applied arguments. builds, may be used as a placeholder for partially applied arguments.
#### Since
0.10.0
#### Arguments #### Arguments
1. `object` *(Object)*: The object to invoke the method on. 1. `object` *(Object)*: The object to invoke the method on.
2. `key` *(string)*: The key of the method. 2. `key` *(string)*: The key of the method.
3. `[partials]` *(...&#42;)*: The arguments to be partially applied. 3. `[partials]` *(...&#42;)*: The arguments to be partially applied.
#### Returns #### Returns
*(Function)*: Returns the new bound function. *(Function)*: Returns the new bound function.
#### Example #### Example
```js ```js
var object = { var object = {
'user': 'fred', 'user': 'fred',
'greet': function(greeting, punctuation) { 'greet': function(greeting, punctuation) {
return greeting + ' ' + this.user + punctuation; return greeting + ' ' + this.user + punctuation;
} }
}; };
skipping to change at line 3169 skipping to change at line 3709
bound('!'); bound('!');
// => 'hi fred!' // => 'hi fred!'
object.greet = function(greeting, punctuation) { object.greet = function(greeting, punctuation) {
return greeting + 'ya ' + this.user + punctuation; return greeting + 'ya ' + this.user + punctuation;
}; };
bound('!'); bound('!');
// => 'hiya fred!' // => 'hiya fred!'
// using placeholders // Bound with placeholders.
var bound = _.bindKey(object, 'greet', _, '!'); var bound = _.bindKey(object, 'greet', _, '!');
bound('hi'); bound('hi');
// => 'hiya fred!' // => 'hiya fred!'
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_curryfunc-arityfunclength"></a>`_.curry(func, [arity=func.length])` <h3 id="_curryfunc-arityfunclength"><code>_.curry(func, [arity=func.length])</co
<a href="#_curryfunc-arityfunclength">#</a> [&#x24C8;](https://github.com/lodash de></h3>
/lodash/blob/4.0.0/lodash.js#L8319 "View in source") [&#x24C9;][1] [&#x24C3;](ht [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L10266 "View
tps://www.npmjs.com/package/lodash.curry "See the npm package") in source") [&#x24C3;](https://www.npmjs.com/package/lodash.curry "See the npm p
ackage") [&#x24C9;][1]
Creates a function that accepts arguments of `func` and either invokes Creates a function that accepts arguments of `func` and either invokes
`func` returning its result, if at least `arity` number of arguments have `func` returning its result, if at least `arity` number of arguments have
been provided, or returns a function that accepts the remaining `func` been provided, or returns a function that accepts the remaining `func`
arguments, and so on. The arity of `func` may be specified if `func.length` arguments, and so on. The arity of `func` may be specified if `func.length`
is not sufficient. is not sufficient.
<br> <br>
<br> <br>
The `_.curry.placeholder` value, which defaults to `_` in monolithic builds, The `_.curry.placeholder` value, which defaults to `_` in monolithic builds,
may be used as a placeholder for provided arguments. may be used as a placeholder for provided arguments.
<br> <br>
<br> <br>
**Note:** This method doesn't set the "length" property of curried functions. **Note:** This method doesn't set the "length" property of curried functions.
#### Since
2.0.0
#### Arguments #### Arguments
1. `func` *(Function)*: The function to curry. 1. `func` *(Function)*: The function to curry.
2. `[arity=func.length]` *(number)*: The arity of `func`. 2. `[arity=func.length]` *(number)*: The arity of `func`.
#### Returns #### Returns
*(Function)*: Returns the new curried function. *(Function)*: Returns the new curried function.
#### Example #### Example
```js ```js
var abc = function(a, b, c) { var abc = function(a, b, c) {
return [a, b, c]; return [a, b, c];
}; };
var curried = _.curry(abc); var curried = _.curry(abc);
curried(1)(2)(3); curried(1)(2)(3);
// => [1, 2, 3] // => [1, 2, 3]
curried(1, 2)(3); curried(1, 2)(3);
// => [1, 2, 3] // => [1, 2, 3]
curried(1, 2, 3); curried(1, 2, 3);
// => [1, 2, 3] // => [1, 2, 3]
// using placeholders // Curried with placeholders.
curried(1)(_, 3)(2); curried(1)(_, 3)(2);
// => [1, 2, 3] // => [1, 2, 3]
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_curryrightfunc-arityfunclength"></a>`_.curryRight(func, [arity=func. <h3 id="_curryrightfunc-arityfunclength"><code>_.curryRight(func, [arity=func.le
length])` ngth])</code></h3>
<a href="#_curryrightfunc-arityfunclength">#</a> [&#x24C8;](https://github.com/l [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L10311 "View
odash/lodash/blob/4.0.0/lodash.js#L8363 "View in source") [&#x24C9;][1] [&#x24C3 in source") [&#x24C3;](https://www.npmjs.com/package/lodash.curryright "See the
;](https://www.npmjs.com/package/lodash.curryright "See the npm package") npm package") [&#x24C9;][1]
This method is like `_.curry` except that arguments are applied to `func` This method is like `_.curry` except that arguments are applied to `func`
in the manner of `_.partialRight` instead of `_.partial`. in the manner of `_.partialRight` instead of `_.partial`.
<br> <br>
<br> <br>
The `_.curryRight.placeholder` value, which defaults to `_` in monolithic The `_.curryRight.placeholder` value, which defaults to `_` in monolithic
builds, may be used as a placeholder for provided arguments. builds, may be used as a placeholder for provided arguments.
<br> <br>
<br> <br>
**Note:** This method doesn't set the "length" property of curried functions. **Note:** This method doesn't set the "length" property of curried functions.
#### Since
3.0.0
#### Arguments #### Arguments
1. `func` *(Function)*: The function to curry. 1. `func` *(Function)*: The function to curry.
2. `[arity=func.length]` *(number)*: The arity of `func`. 2. `[arity=func.length]` *(number)*: The arity of `func`.
#### Returns #### Returns
*(Function)*: Returns the new curried function. *(Function)*: Returns the new curried function.
#### Example #### Example
```js ```js
var abc = function(a, b, c) { var abc = function(a, b, c) {
return [a, b, c]; return [a, b, c];
}; };
var curried = _.curryRight(abc); var curried = _.curryRight(abc);
curried(3)(2)(1); curried(3)(2)(1);
// => [1, 2, 3] // => [1, 2, 3]
curried(2, 3)(1); curried(2, 3)(1);
// => [1, 2, 3] // => [1, 2, 3]
curried(1, 2, 3); curried(1, 2, 3);
// => [1, 2, 3] // => [1, 2, 3]
// using placeholders // Curried with placeholders.
curried(3)(1, _)(2); curried(3)(1, _)(2);
// => [1, 2, 3] // => [1, 2, 3]
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_debouncefunc-wait0-options"></a>`_.debounce(func, [wait=0], [options <h3 id="_debouncefunc-wait0-options"><code>_.debounce(func, [wait=0], [options={
])` }])</code></h3>
<a href="#_debouncefunc-wait0-options">#</a> [&#x24C8;](https://github.com/lodas [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L10372 "View
h/lodash/blob/4.0.0/lodash.js#L8419 "View in source") [&#x24C9;][1] [&#x24C3;](h in source") [&#x24C3;](https://www.npmjs.com/package/lodash.debounce "See the np
ttps://www.npmjs.com/package/lodash.debounce "See the npm package") m package") [&#x24C9;][1]
Creates a debounced function that delays invoking `func` until after `wait` Creates a debounced function that delays invoking `func` until after `wait`
milliseconds have elapsed since the last time the debounced function was milliseconds have elapsed since the last time the debounced function was
invoked. The debounced function comes with a `cancel` method to cancel invoked. The debounced function comes with a `cancel` method to cancel
delayed `func` invocations and a `flush` method to immediately invoke them. delayed `func` invocations and a `flush` method to immediately invoke them.
Provide an options object to indicate whether `func` should be invoked on Provide `options` to indicate whether `func` should be invoked on the
the leading and/or trailing edge of the `wait` timeout. The `func` is invoked leading and/or trailing edge of the `wait` timeout. The `func` is invoked
with the last arguments provided to the debounced function. Subsequent calls with the last arguments provided to the debounced function. Subsequent
to the debounced function return the result of the last `func` invocation. calls to the debounced function return the result of the last `func`
invocation.
<br> <br>
<br> <br>
**Note:** If `leading` and `trailing` options are `true`, `func` is invoked **Note:** If `leading` and `trailing` options are `true`, `func` is
on the trailing edge of the timeout only if the the debounced function is invoked on the trailing edge of the timeout only if the debounced function
invoked more than once during the `wait` timeout. is invoked more than once during the `wait` timeout.
<br> <br>
<br> <br>
See [David Corbacho's article](http://drupalmotion.com/article/debounce-and-thro If `wait` is `0` and `leading` is `false`, `func` invocation is deferred
ttle-visual-explanation) until to the next tick, similar to `setTimeout` with a timeout of `0`.
<br>
<br>
See [David Corbacho's article](https://css-tricks.com/debouncing-throttling-expl
ained-examples/)
for details over the differences between `_.debounce` and `_.throttle`. for details over the differences between `_.debounce` and `_.throttle`.
#### Since
0.1.0
#### Arguments #### Arguments
1. `func` *(Function)*: The function to debounce. 1. `func` *(Function)*: The function to debounce.
2. `[wait=0]` *(number)*: The number of milliseconds to delay. 2. `[wait=0]` *(number)*: The number of milliseconds to delay.
3. `[options]` *(Object)*: The options object. 3. `[options={}]` *(Object)*: The options object.
4. `[options.leading=false]` *(boolean)*: Specify invoking on the leading edge o f the timeout. 4. `[options.leading=false]` *(boolean)*: Specify invoking on the leading edge o f the timeout.
5. `[options.maxWait]` *(number)*: The maximum time `func` is allowed to be dela yed before it's invoked. 5. `[options.maxWait]` *(number)*: The maximum time `func` is allowed to be dela yed before it's invoked.
6. `[options.trailing=true]` *(boolean)*: Specify invoking on the trailing edge of the timeout. 6. `[options.trailing=true]` *(boolean)*: Specify invoking on the trailing edge of the timeout.
#### Returns #### Returns
*(Function)*: Returns the new debounced function. *(Function)*: Returns the new debounced function.
#### Example #### Example
```js ```js
// avoid costly calculations while the window size is in flux // Avoid costly calculations while the window size is in flux.
jQuery(window).on('resize', _.debounce(calculateLayout, 150)); jQuery(window).on('resize', _.debounce(calculateLayout, 150));
// invoke `sendMail` when clicked, debouncing subsequent calls // Invoke `sendMail` when clicked, debouncing subsequent calls.
jQuery(element).on('click', _.debounce(sendMail, 300, { jQuery(element).on('click', _.debounce(sendMail, 300, {
'leading': true, 'leading': true,
'trailing': false 'trailing': false
})); }));
// ensure `batchLog` is invoked once after 1 second of debounced calls // Ensure `batchLog` is invoked once after 1 second of debounced calls.
var debounced = _.debounce(batchLog, 250, { 'maxWait': 1000 }); var debounced = _.debounce(batchLog, 250, { 'maxWait': 1000 });
var source = new EventSource('/stream'); var source = new EventSource('/stream');
jQuery(source).on('message', debounced); jQuery(source).on('message', debounced);
// cancel a trailing debounced invocation // Cancel the trailing debounced invocation.
jQuery(window).on('popstate', debounced.cancel); jQuery(window).on('popstate', debounced.cancel);
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_deferfunc-args"></a>`_.defer(func, [args])` <h3 id="_deferfunc-args"><code>_.defer(func, [args])</code></h3>
<a href="#_deferfunc-args">#</a> [&#x24C8;](https://github.com/lodash/lodash/blo [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L10515 "View
b/4.0.0/lodash.js#L8551 "View in source") [&#x24C9;][1] [&#x24C3;](https://www.n in source") [&#x24C3;](https://www.npmjs.com/package/lodash.defer "See the npm p
pmjs.com/package/lodash.defer "See the npm package") ackage") [&#x24C9;][1]
Defers invoking the `func` until the current call stack has cleared. Any Defers invoking the `func` until the current call stack has cleared. Any
additional arguments are provided to `func` when it's invoked. additional arguments are provided to `func` when it's invoked.
#### Since
0.1.0
#### Arguments #### Arguments
1. `func` *(Function)*: The function to defer. 1. `func` *(Function)*: The function to defer.
2. `[args]` *(...&#42;)*: The arguments to invoke `func` with. 2. `[args]` *(...&#42;)*: The arguments to invoke `func` with.
#### Returns #### Returns
*(number)*: Returns the timer id. *(number)*: Returns the timer id.
#### Example #### Example
```js ```js
_.defer(function(text) { _.defer(function(text) {
console.log(text); console.log(text);
}, 'deferred'); }, 'deferred');
// logs 'deferred' after one or more milliseconds // => Logs 'deferred' after one millisecond.
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_delayfunc-wait-args"></a>`_.delay(func, wait, [args])` <h3 id="_delayfunc-wait-args"><code>_.delay(func, wait, [args])</code></h3>
<a href="#_delayfunc-wait-args">#</a> [&#x24C8;](https://github.com/lodash/lodas [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L10538 "View
h/blob/4.0.0/lodash.js#L8573 "View in source") [&#x24C9;][1] [&#x24C3;](https:// in source") [&#x24C3;](https://www.npmjs.com/package/lodash.delay "See the npm p
www.npmjs.com/package/lodash.delay "See the npm package") ackage") [&#x24C9;][1]
Invokes `func` after `wait` milliseconds. Any additional arguments are Invokes `func` after `wait` milliseconds. Any additional arguments are
provided to `func` when it's invoked. provided to `func` when it's invoked.
#### Since
0.1.0
#### Arguments #### Arguments
1. `func` *(Function)*: The function to delay. 1. `func` *(Function)*: The function to delay.
2. `wait` *(number)*: The number of milliseconds to delay invocation. 2. `wait` *(number)*: The number of milliseconds to delay invocation.
3. `[args]` *(...&#42;)*: The arguments to invoke `func` with. 3. `[args]` *(...&#42;)*: The arguments to invoke `func` with.
#### Returns #### Returns
*(number)*: Returns the timer id. *(number)*: Returns the timer id.
#### Example #### Example
```js ```js
_.delay(function(text) { _.delay(function(text) {
console.log(text); console.log(text);
}, 1000, 'later'); }, 1000, 'later');
// => logs 'later' after one second // => Logs 'later' after one second.
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_flipfunc"></a>`_.flip(func)` <h3 id="_flipfunc"><code>_.flip(func)</code></h3>
<a href="#_flipfunc">#</a> [&#x24C8;](https://github.com/lodash/lodash/blob/4.0. [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L10560 "View
0/lodash.js#L8594 "View in source") [&#x24C9;][1] [&#x24C3;](https://www.npmjs.c in source") [&#x24C3;](https://www.npmjs.com/package/lodash.flip "See the npm pa
om/package/lodash.flip "See the npm package") ckage") [&#x24C9;][1]
Creates a function that invokes `func` with arguments reversed. Creates a function that invokes `func` with arguments reversed.
#### Since
4.0.0
#### Arguments #### Arguments
1. `func` *(Function)*: The function to flip arguments for. 1. `func` *(Function)*: The function to flip arguments for.
#### Returns #### Returns
*(Function)*: Returns the new function. *(Function)*: Returns the new flipped function.
#### Example #### Example
```js ```js
var flipped = _.flip(function() { var flipped = _.flip(function() {
return _.toArray(arguments); return _.toArray(arguments);
}); });
flipped('a', 'b', 'c', 'd'); flipped('a', 'b', 'c', 'd');
// => ['d', 'c', 'b', 'a'] // => ['d', 'c', 'b', 'a']
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_memoizefunc-resolver"></a>`_.memoize(func, [resolver])` <h3 id="_memoizefunc-resolver"><code>_.memoize(func, [resolver])</code></h3>
<a href="#_memoizefunc-resolver">#</a> [&#x24C8;](https://github.com/lodash/loda [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L10608 "View
sh/blob/4.0.0/lodash.js#L8640 "View in source") [&#x24C9;][1] [&#x24C3;](https:/ in source") [&#x24C3;](https://www.npmjs.com/package/lodash.memoize "See the npm
/www.npmjs.com/package/lodash.memoize "See the npm package") package") [&#x24C9;][1]
Creates a function that memoizes the result of `func`. If `resolver` is Creates a function that memoizes the result of `func`. If `resolver` is
provided it determines the cache key for storing the result based on the provided, it determines the cache key for storing the result based on the
arguments provided to the memoized function. By default, the first argument arguments provided to the memoized function. By default, the first argument
provided to the memoized function is used as the map cache key. The `func` provided to the memoized function is used as the map cache key. The `func`
is invoked with the `this` binding of the memoized function. is invoked with the `this` binding of the memoized function.
<br> <br>
<br> <br>
**Note:** The cache is exposed as the `cache` property on the memoized **Note:** The cache is exposed as the `cache` property on the memoized
function. Its creation may be customized by replacing the `_.memoize.Cache` function. Its creation may be customized by replacing the `_.memoize.Cache`
constructor with one whose instances implement the [`Map`](http://ecma-internati constructor with one whose instances implement the
onal.org/ecma-262/6.0/#sec-properties-of-the-map-prototype-object) [`Map`](http://ecma-international.org/ecma-262/7.0/#sec-properties-of-the-map-pr
method interface of `delete`, `get`, `has`, and `set`. ototype-object)
method interface of `clear`, `delete`, `get`, `has`, and `set`.
#### Since
0.1.0
#### Arguments #### Arguments
1. `func` *(Function)*: The function to have its output memoized. 1. `func` *(Function)*: The function to have its output memoized.
2. `[resolver]` *(Function)*: The function to resolve the cache key. 2. `[resolver]` *(Function)*: The function to resolve the cache key.
#### Returns #### Returns
*(Function)*: Returns the new memoizing function. *(Function)*: Returns the new memoized function.
#### Example #### Example
```js ```js
var object = { 'a': 1, 'b': 2 }; var object = { 'a': 1, 'b': 2 };
var other = { 'c': 3, 'd': 4 }; var other = { 'c': 3, 'd': 4 };
var values = _.memoize(_.values); var values = _.memoize(_.values);
values(object); values(object);
// => [1, 2] // => [1, 2]
values(other); values(other);
// => [3, 4] // => [3, 4]
object.a = 2; object.a = 2;
values(object); values(object);
// => [1, 2] // => [1, 2]
// modifying the result cache // Modify the result cache.
values.cache.set(object, ['a', 'b']); values.cache.set(object, ['a', 'b']);
values(object); values(object);
// => ['a', 'b'] // => ['a', 'b']
// replacing `_.memoize.Cache` // Replace `_.memoize.Cache`.
_.memoize.Cache = WeakMap; _.memoize.Cache = WeakMap;
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_negatepredicate"></a>`_.negate(predicate)` <h3 id="_negatepredicate"><code>_.negate(predicate)</code></h3>
<a href="#_negatepredicate">#</a> [&#x24C8;](https://github.com/lodash/lodash/bl [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L10651 "View
ob/4.0.0/lodash.js#L8679 "View in source") [&#x24C9;][1] [&#x24C3;](https://www. in source") [&#x24C3;](https://www.npmjs.com/package/lodash.negate "See the npm
npmjs.com/package/lodash.negate "See the npm package") package") [&#x24C9;][1]
Creates a function that negates the result of the predicate `func`. The Creates a function that negates the result of the predicate `func`. The
`func` predicate is invoked with the `this` binding and arguments of the `func` predicate is invoked with the `this` binding and arguments of the
created function. created function.
#### Since
3.0.0
#### Arguments #### Arguments
1. `predicate` *(Function)*: The predicate to negate. 1. `predicate` *(Function)*: The predicate to negate.
#### Returns #### Returns
*(Function)*: Returns the new function. *(Function)*: Returns the new negated function.
#### Example #### Example
```js ```js
function isEven(n) { function isEven(n) {
return n % 2 == 0; return n % 2 == 0;
} }
_.filter([1, 2, 3, 4, 5, 6], _.negate(isEven)); _.filter([1, 2, 3, 4, 5, 6], _.negate(isEven));
// => [1, 3, 5] // => [1, 3, 5]
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_oncefunc"></a>`_.once(func)` <h3 id="_oncefunc"><code>_.once(func)</code></h3>
<a href="#_oncefunc">#</a> [&#x24C8;](https://github.com/lodash/lodash/blob/4.0. [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L10685 "View
0/lodash.js#L8705 "View in source") [&#x24C9;][1] [&#x24C3;](https://www.npmjs.c in source") [&#x24C3;](https://www.npmjs.com/package/lodash.once "See the npm pa
om/package/lodash.once "See the npm package") ckage") [&#x24C9;][1]
Creates a function that is restricted to invoking `func` once. Repeat calls Creates a function that is restricted to invoking `func` once. Repeat calls
to the function return the value of the first invocation. The `func` is to the function return the value of the first invocation. The `func` is
invoked with the `this` binding and arguments of the created function. invoked with the `this` binding and arguments of the created function.
#### Since
0.1.0
#### Arguments #### Arguments
1. `func` *(Function)*: The function to restrict. 1. `func` *(Function)*: The function to restrict.
#### Returns #### Returns
*(Function)*: Returns the new restricted function. *(Function)*: Returns the new restricted function.
#### Example #### Example
```js ```js
var initialize = _.once(createApplication); var initialize = _.once(createApplication);
initialize(); initialize();
initialize(); initialize();
// `initialize` invokes `createApplication` once // => `createApplication` is invoked once
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_overargsfunc-transforms"></a>`_.overArgs(func, [transforms])` <h3 id="_overargsfunc-transforms_identity"><code>_.overArgs(func, [transforms=[_
<a href="#_overargsfunc-transforms">#</a> [&#x24C8;](https://github.com/lodash/l .identity]])</code></h3>
odash/blob/4.0.0/lodash.js#L8740 "View in source") [&#x24C9;][1] [&#x24C3;](http [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L10720 "View
s://www.npmjs.com/package/lodash.overargs "See the npm package") in source") [&#x24C3;](https://www.npmjs.com/package/lodash.overargs "See the np
m package") [&#x24C9;][1]
Creates a function that invokes `func` with arguments transformed by Creates a function that invokes `func` with its arguments transformed.
corresponding `transforms`.
#### Since
4.0.0
#### Arguments #### Arguments
1. `func` *(Function)*: The function to wrap. 1. `func` *(Function)*: The function to wrap.
2. `[transforms]` *(...(Function|Function&#91;&#93;)*: The functions to transfor m arguments, specified individually or in arrays. 2. `[transforms=[_.identity]]` *(...(Function|Function&#91;&#93;))*: The argumen t transforms.
#### Returns #### Returns
*(Function)*: Returns the new function. *(Function)*: Returns the new function.
#### Example #### Example
```js ```js
function doubled(n) { function doubled(n) {
return n * 2; return n * 2;
} }
function square(n) { function square(n) {
return n * n; return n * n;
} }
var func = _.overArgs(function(x, y) { var func = _.overArgs(function(x, y) {
return [x, y]; return [x, y];
}, square, doubled); }, [square, doubled]);
func(9, 3); func(9, 3);
// => [81, 6] // => [81, 6]
func(10, 5); func(10, 5);
// => [100, 10] // => [100, 10]
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_partialfunc-partials"></a>`_.partial(func, [partials])` <h3 id="_partialfunc-partials"><code>_.partial(func, [partials])</code></h3>
<a href="#_partialfunc-partials">#</a> [&#x24C8;](https://github.com/lodash/loda [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L10770 "View
sh/blob/4.0.0/lodash.js#L8787 "View in source") [&#x24C9;][1] [&#x24C3;](https:/ in source") [&#x24C3;](https://www.npmjs.com/package/lodash.partial "See the npm
/www.npmjs.com/package/lodash.partial "See the npm package") package") [&#x24C9;][1]
Creates a function that invokes `func` with `partial` arguments prepended Creates a function that invokes `func` with `partials` prepended to the
to those provided to the new function. This method is like `_.bind` except arguments it receives. This method is like `_.bind` except it does **not**
it does **not** alter the `this` binding. alter the `this` binding.
<br> <br>
<br> <br>
The `_.partial.placeholder` value, which defaults to `_` in monolithic The `_.partial.placeholder` value, which defaults to `_` in monolithic
builds, may be used as a placeholder for partially applied arguments. builds, may be used as a placeholder for partially applied arguments.
<br> <br>
<br> <br>
**Note:** This method doesn't set the "length" property of partially **Note:** This method doesn't set the "length" property of partially
applied functions. applied functions.
#### Since
0.2.0
#### Arguments #### Arguments
1. `func` *(Function)*: The function to partially apply arguments to. 1. `func` *(Function)*: The function to partially apply arguments to.
2. `[partials]` *(...&#42;)*: The arguments to be partially applied. 2. `[partials]` *(...&#42;)*: The arguments to be partially applied.
#### Returns #### Returns
*(Function)*: Returns the new partially applied function. *(Function)*: Returns the new partially applied function.
#### Example #### Example
```js ```js
var greet = function(greeting, name) { function greet(greeting, name) {
return greeting + ' ' + name; return greeting + ' ' + name;
}; }
var sayHelloTo = _.partial(greet, 'hello'); var sayHelloTo = _.partial(greet, 'hello');
sayHelloTo('fred'); sayHelloTo('fred');
// => 'hello fred' // => 'hello fred'
// using placeholders // Partially applied with placeholders.
var greetFred = _.partial(greet, _, 'fred'); var greetFred = _.partial(greet, _, 'fred');
greetFred('hi'); greetFred('hi');
// => 'hi fred' // => 'hi fred'
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_partialrightfunc-partials"></a>`_.partialRight(func, [partials])` <h3 id="_partialrightfunc-partials"><code>_.partialRight(func, [partials])</code
<a href="#_partialrightfunc-partials">#</a> [&#x24C8;](https://github.com/lodash ></h3>
/lodash/blob/4.0.0/lodash.js#L8823 "View in source") [&#x24C9;][1] [&#x24C3;](ht [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L10807 "View
tps://www.npmjs.com/package/lodash.partialright "See the npm package") in source") [&#x24C3;](https://www.npmjs.com/package/lodash.partialright "See th
e npm package") [&#x24C9;][1]
This method is like `_.partial` except that partially applied arguments This method is like `_.partial` except that partially applied arguments
are appended to those provided to the new function. are appended to the arguments it receives.
<br> <br>
<br> <br>
The `_.partialRight.placeholder` value, which defaults to `_` in monolithic The `_.partialRight.placeholder` value, which defaults to `_` in monolithic
builds, may be used as a placeholder for partially applied arguments. builds, may be used as a placeholder for partially applied arguments.
<br> <br>
<br> <br>
**Note:** This method doesn't set the "length" property of partially **Note:** This method doesn't set the "length" property of partially
applied functions. applied functions.
#### Since
1.0.0
#### Arguments #### Arguments
1. `func` *(Function)*: The function to partially apply arguments to. 1. `func` *(Function)*: The function to partially apply arguments to.
2. `[partials]` *(...&#42;)*: The arguments to be partially applied. 2. `[partials]` *(...&#42;)*: The arguments to be partially applied.
#### Returns #### Returns
*(Function)*: Returns the new partially applied function. *(Function)*: Returns the new partially applied function.
#### Example #### Example
```js ```js
var greet = function(greeting, name) { function greet(greeting, name) {
return greeting + ' ' + name; return greeting + ' ' + name;
}; }
var greetFred = _.partialRight(greet, 'fred'); var greetFred = _.partialRight(greet, 'fred');
greetFred('hi'); greetFred('hi');
// => 'hi fred' // => 'hi fred'
// using placeholders // Partially applied with placeholders.
var sayHelloTo = _.partialRight(greet, 'hello', _); var sayHelloTo = _.partialRight(greet, 'hello', _);
sayHelloTo('fred'); sayHelloTo('fred');
// => 'hello fred' // => 'hello fred'
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_reargfunc-indexes"></a>`_.rearg(func, indexes)` <h3 id="_reargfunc-indexes"><code>_.rearg(func, indexes)</code></h3>
<a href="#_reargfunc-indexes">#</a> [&#x24C8;](https://github.com/lodash/lodash/ [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L10834 "View
blob/4.0.0/lodash.js#L8850 "View in source") [&#x24C9;][1] [&#x24C3;](https://ww in source") [&#x24C3;](https://www.npmjs.com/package/lodash.rearg "See the npm p
w.npmjs.com/package/lodash.rearg "See the npm package") ackage") [&#x24C9;][1]
Creates a function that invokes `func` with arguments arranged according Creates a function that invokes `func` with arguments arranged according
to the specified indexes where the argument value at the first index is to the specified `indexes` where the argument value at the first index is
provided as the first argument, the argument value at the second index is provided as the first argument, the argument value at the second index is
provided as the second argument, and so on. provided as the second argument, and so on.
#### Since
3.0.0
#### Arguments #### Arguments
1. `func` *(Function)*: The function to rearrange arguments for. 1. `func` *(Function)*: The function to rearrange arguments for.
2. `indexes` *(...(number|number&#91;&#93;)*: The arranged argument indexes, spe cified individually or in arrays. 2. `indexes` *(...(number|number&#91;&#93;))*: The arranged argument indexes.
#### Returns #### Returns
*(Function)*: Returns the new function. *(Function)*: Returns the new function.
#### Example #### Example
```js ```js
var rearged = _.rearg(function(a, b, c) { var rearged = _.rearg(function(a, b, c) {
return [a, b, c]; return [a, b, c];
}, 2, 0, 1); }, [2, 0, 1]);
rearged('b', 'c', 'a') rearged('b', 'c', 'a')
// => ['a', 'b', 'c'] // => ['a', 'b', 'c']
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_restfunc-startfunclength-1"></a>`_.rest(func, [start=func.length-1]) <h3 id="_restfunc-startfunclength-1"><code>_.rest(func, [start=func.length-1])</
` code></h3>
<a href="#_restfunc-startfunclength-1">#</a> [&#x24C8;](https://github.com/lodas [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L10863 "View
h/lodash/blob/4.0.0/lodash.js#L8876 "View in source") [&#x24C9;][1] [&#x24C3;](h in source") [&#x24C3;](https://www.npmjs.com/package/lodash.rest "See the npm pa
ttps://www.npmjs.com/package/lodash.rest "See the npm package") ckage") [&#x24C9;][1]
Creates a function that invokes `func` with the `this` binding of the Creates a function that invokes `func` with the `this` binding of the
created function and arguments from `start` and beyond provided as an array. created function and arguments from `start` and beyond provided as
an array.
<br> <br>
<br> <br>
**Note:** This method is based on the [rest parameter](https://mdn.io/rest_param **Note:** This method is based on the
eters). [rest parameter](https://mdn.io/rest_parameters).
#### Since
4.0.0
#### Arguments #### Arguments
1. `func` *(Function)*: The function to apply a rest parameter to. 1. `func` *(Function)*: The function to apply a rest parameter to.
2. `[start=func.length-1]` *(number)*: The start position of the rest parameter. 2. `[start=func.length-1]` *(number)*: The start position of the rest parameter.
#### Returns #### Returns
*(Function)*: Returns the new function. *(Function)*: Returns the new function.
#### Example #### Example
```js ```js
var say = _.rest(function(what, names) { var say = _.rest(function(what, names) {
return what + ' ' + _.initial(names).join(', ') + return what + ' ' + _.initial(names).join(', ') +
(_.size(names) > 1 ? ', & ' : '') + _.last(names); (_.size(names) > 1 ? ', & ' : '') + _.last(names);
}); });
say('hello', 'fred', 'barney', 'pebbles'); say('hello', 'fred', 'barney', 'pebbles');
// => 'hello fred, barney, & pebbles' // => 'hello fred, barney, & pebbles'
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_spreadfunc"></a>`_.spread(func)` <h3 id="_spreadfunc-start0"><code>_.spread(func, [start=0])</code></h3>
<a href="#_spreadfunc">#</a> [&#x24C8;](https://github.com/lodash/lodash/blob/4. [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L10905 "View
0.0/lodash.js#L8936 "View in source") [&#x24C9;][1] [&#x24C3;](https://www.npmjs in source") [&#x24C3;](https://www.npmjs.com/package/lodash.spread "See the npm
.com/package/lodash.spread "See the npm package") package") [&#x24C9;][1]
Creates a function that invokes `func` with the `this` binding of the created Creates a function that invokes `func` with the `this` binding of the
function and an array of arguments much like [`Function#apply`](https://es5.gith create function and an array of arguments much like
ub.io/#x15.3.4.3). [`Function#apply`](http://www.ecma-international.org/ecma-262/7.0/#sec-function.
prototype.apply).
<br> <br>
<br> <br>
**Note:** This method is based on the [spread operator](https://mdn.io/spread_op **Note:** This method is based on the
erator). [spread operator](https://mdn.io/spread_operator).
#### Since
3.2.0
#### Arguments #### Arguments
1. `func` *(Function)*: The function to spread arguments over. 1. `func` *(Function)*: The function to spread arguments over.
2. `[start=0]` *(number)*: The start position of the spread.
#### Returns #### Returns
*(Function)*: Returns the new function. *(Function)*: Returns the new function.
#### Example #### Example
```js ```js
var say = _.spread(function(who, what) { var say = _.spread(function(who, what) {
return who + ' says ' + what; return who + ' says ' + what;
}); });
say(['fred', 'hello']); say(['fred', 'hello']);
// => 'fred says hello' // => 'fred says hello'
// with a Promise
var numbers = Promise.all([ var numbers = Promise.all([
Promise.resolve(40), Promise.resolve(40),
Promise.resolve(36) Promise.resolve(36)
]); ]);
numbers.then(_.spread(function(x, y) { numbers.then(_.spread(function(x, y) {
return x + y; return x + y;
})); }));
// => a Promise of 76 // => a Promise of 76
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_throttlefunc-wait0-options"></a>`_.throttle(func, [wait=0], [options <h3 id="_throttlefunc-wait0-options"><code>_.throttle(func, [wait=0], [options={
])` }])</code></h3>
<a href="#_throttlefunc-wait0-options">#</a> [&#x24C8;](https://github.com/lodas [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L10965 "View
h/lodash/blob/4.0.0/lodash.js#L8985 "View in source") [&#x24C9;][1] [&#x24C3;](h in source") [&#x24C3;](https://www.npmjs.com/package/lodash.throttle "See the np
ttps://www.npmjs.com/package/lodash.throttle "See the npm package") m package") [&#x24C9;][1]
Creates a throttled function that only invokes `func` at most once per Creates a throttled function that only invokes `func` at most once per
every `wait` milliseconds. The throttled function comes with a `cancel` every `wait` milliseconds. The throttled function comes with a `cancel`
method to cancel delayed `func` invocations and a `flush` method to method to cancel delayed `func` invocations and a `flush` method to
immediately invoke them. Provide an options object to indicate whether immediately invoke them. Provide `options` to indicate whether `func`
`func` should be invoked on the leading and/or trailing edge of the `wait` should be invoked on the leading and/or trailing edge of the `wait`
timeout. The `func` is invoked with the last arguments provided to the timeout. The `func` is invoked with the last arguments provided to the
throttled function. Subsequent calls to the throttled function return the throttled function. Subsequent calls to the throttled function return the
result of the last `func` invocation. result of the last `func` invocation.
<br> <br>
<br> <br>
**Note:** If `leading` and `trailing` options are `true`, `func` is invoked **Note:** If `leading` and `trailing` options are `true`, `func` is
on the trailing edge of the timeout only if the the throttled function is invoked on the trailing edge of the timeout only if the throttled function
invoked more than once during the `wait` timeout. is invoked more than once during the `wait` timeout.
<br>
<br>
If `wait` is `0` and `leading` is `false`, `func` invocation is deferred
until to the next tick, similar to `setTimeout` with a timeout of `0`.
<br> <br>
<br> <br>
See [David Corbacho's article](http://drupalmotion.com/article/debounce-and-thro ttle-visual-explanation) See [David Corbacho's article](https://css-tricks.com/debouncing-throttling-expl ained-examples/)
for details over the differences between `_.throttle` and `_.debounce`. for details over the differences between `_.throttle` and `_.debounce`.
#### Since
0.1.0
#### Arguments #### Arguments
1. `func` *(Function)*: The function to throttle. 1. `func` *(Function)*: The function to throttle.
2. `[wait=0]` *(number)*: The number of milliseconds to throttle invocations to. 2. `[wait=0]` *(number)*: The number of milliseconds to throttle invocations to.
3. `[options]` *(Object)*: The options object. 3. `[options={}]` *(Object)*: The options object.
4. `[options.leading=true]` *(boolean)*: Specify invoking on the leading edge of the timeout. 4. `[options.leading=true]` *(boolean)*: Specify invoking on the leading edge of the timeout.
5. `[options.trailing=true]` *(boolean)*: Specify invoking on the trailing edge of the timeout. 5. `[options.trailing=true]` *(boolean)*: Specify invoking on the trailing edge of the timeout.
#### Returns #### Returns
*(Function)*: Returns the new throttled function. *(Function)*: Returns the new throttled function.
#### Example #### Example
```js ```js
// avoid excessively updating the position while scrolling // Avoid excessively updating the position while scrolling.
jQuery(window).on('scroll', _.throttle(updatePosition, 100)); jQuery(window).on('scroll', _.throttle(updatePosition, 100));
// invoke `renewToken` when the click event is fired, but not more than once eve ry 5 minutes // Invoke `renewToken` when the click event is fired, but not more than once eve ry 5 minutes.
var throttled = _.throttle(renewToken, 300000, { 'trailing': false }); var throttled = _.throttle(renewToken, 300000, { 'trailing': false });
jQuery(element).on('click', throttled); jQuery(element).on('click', throttled);
// cancel a trailing throttled invocation // Cancel the trailing throttled invocation.
jQuery(window).on('popstate', throttled.cancel); jQuery(window).on('popstate', throttled.cancel);
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_unaryfunc"></a>`_.unary(func)` <h3 id="_unaryfunc"><code>_.unary(func)</code></h3>
<a href="#_unaryfunc">#</a> [&#x24C8;](https://github.com/lodash/lodash/blob/4.0 [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L10998 "View
.0/lodash.js#L9013 "View in source") [&#x24C9;][1] [&#x24C3;](https://www.npmjs. in source") [&#x24C3;](https://www.npmjs.com/package/lodash.unary "See the npm p
com/package/lodash.unary "See the npm package") ackage") [&#x24C9;][1]
Creates a function that accepts up to one argument, ignoring any Creates a function that accepts up to one argument, ignoring any
additional arguments. additional arguments.
#### Since
4.0.0
#### Arguments #### Arguments
1. `func` *(Function)*: The function to cap arguments for. 1. `func` *(Function)*: The function to cap arguments for.
#### Returns #### Returns
*(Function)*: Returns the new function. *(Function)*: Returns the new capped function.
#### Example #### Example
```js ```js
_.map(['6', '8', '10'], _.unary(parseInt)); _.map(['6', '8', '10'], _.unary(parseInt));
// => [6, 8, 10] // => [6, 8, 10]
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_wrapvalue-wrapper"></a>`_.wrap(value, wrapper)` <h3 id="_wrapvalue-wrapperidentity"><code>_.wrap(value, [wrapper=identity])</cod
<a href="#_wrapvalue-wrapper">#</a> [&#x24C8;](https://github.com/lodash/lodash/ e></h3>
blob/4.0.0/lodash.js#L9038 "View in source") [&#x24C9;][1] [&#x24C3;](https://ww [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L11024 "View
w.npmjs.com/package/lodash.wrap "See the npm package") in source") [&#x24C3;](https://www.npmjs.com/package/lodash.wrap "See the npm pa
ckage") [&#x24C9;][1]
Creates a function that provides `value` to `wrapper` as its first
argument. Any additional arguments provided to the function are appended
to those provided to the `wrapper`. The wrapper is invoked with the `this`
binding of the created function.
Creates a function that provides `value` to the wrapper function as its #### Since
first argument. Any additional arguments provided to the function are 0.1.0
appended to those provided to the wrapper function. The wrapper is invoked
with the `this` binding of the created function.
#### Arguments #### Arguments
1. `value` *(&#42;)*: The value to wrap. 1. `value` *(&#42;)*: The value to wrap.
2. `wrapper` *(Function)*: The wrapper function. 2. `[wrapper=identity]` *(Function)*: The wrapper function.
#### Returns #### Returns
*(Function)*: Returns the new function. *(Function)*: Returns the new function.
#### Example #### Example
```js ```js
var p = _.wrap(_.escape, function(func, text) { var p = _.wrap(_.escape, function(func, text) {
return '<p>' + func(text) + '</p>'; return '<p>' + func(text) + '</p>';
}); });
p('fred, barney, & pebbles'); p('fred, barney, & pebbles');
// => '<p>fred, barney, &amp; pebbles</p>' // => '<p>fred, barney, &amp; pebbles</p>'
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
## `“Lang” Methods` ## `“Lang” Methods`
<!-- div --> <!-- div -->
### <a id="_clonevalue"></a>`_.clone(value)` <h3 id="_castarrayvalue"><code>_.castArray(value)</code></h3>
<a href="#_clonevalue">#</a> [&#x24C8;](https://github.com/lodash/lodash/blob/4. [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L11063 "View
0.0/lodash.js#L9069 "View in source") [&#x24C9;][1] [&#x24C3;](https://www.npmjs in source") [&#x24C3;](https://www.npmjs.com/package/lodash.castarray "See the n
.com/package/lodash.clone "See the npm package") pm package") [&#x24C9;][1]
Casts `value` as an array if it's not one.
#### Since
4.4.0
#### Arguments
1. `value` *(&#42;)*: The value to inspect.
#### Returns
*(Array)*: Returns the cast array.
#### Example
```js
_.castArray(1);
// => [1]
_.castArray({ 'a': 1 });
// => [{ 'a': 1 }]
_.castArray('abc');
// => ['abc']
_.castArray(null);
// => [null]
_.castArray(undefined);
// => [undefined]
_.castArray();
// => []
var array = [1, 2, 3];
console.log(_.castArray(array) === array);
// => true
```
---
<!-- /div -->
<!-- div -->
<h3 id="_clonevalue"><code>_.clone(value)</code></h3>
[&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L11097 "View
in source") [&#x24C3;](https://www.npmjs.com/package/lodash.clone "See the npm p
ackage") [&#x24C9;][1]
Creates a shallow clone of `value`. Creates a shallow clone of `value`.
<br> <br>
<br> <br>
**Note:** This method is loosely based on the **Note:** This method is loosely based on the
[structured clone algorithm](https://mdn.io/Structured_clone_algorithm) [structured clone algorithm](https://mdn.io/Structured_clone_algorithm)
and supports cloning arrays, array buffers, booleans, date objects, maps, and supports cloning arrays, array buffers, booleans, date objects, maps,
numbers, `Object` objects, regexes, sets, strings, symbols, and typed numbers, `Object` objects, regexes, sets, strings, symbols, and typed
arrays. The own enumerable properties of `arguments` objects are cloned arrays. The own enumerable properties of `arguments` objects are cloned
as plain objects. An empty object is returned for uncloneable values such as plain objects. An empty object is returned for uncloneable values such
as error objects, functions, DOM nodes, and WeakMaps. as error objects, functions, DOM nodes, and WeakMaps.
#### Since
0.1.0
#### Arguments #### Arguments
1. `value` *(&#42;)*: The value to clone. 1. `value` *(&#42;)*: The value to clone.
#### Returns #### Returns
*(&#42;)*: Returns the cloned value. *(&#42;)*: Returns the cloned value.
#### Example #### Example
```js ```js
var objects = [{ 'a': 1 }, { 'b': 2 }]; var objects = [{ 'a': 1 }, { 'b': 2 }];
var shallow = _.clone(objects); var shallow = _.clone(objects);
console.log(shallow[0] === objects[0]); console.log(shallow[0] === objects[0]);
// => true // => true
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_clonedeepvalue"></a>`_.cloneDeep(value)` <h3 id="_clonedeepvalue"><code>_.cloneDeep(value)</code></h3>
<a href="#_clonedeepvalue">#</a> [&#x24C8;](https://github.com/lodash/lodash/blo [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L11155 "View
b/4.0.0/lodash.js#L9122 "View in source") [&#x24C9;][1] [&#x24C3;](https://www.n in source") [&#x24C3;](https://www.npmjs.com/package/lodash.clonedeep "See the n
pmjs.com/package/lodash.clonedeep "See the npm package") pm package") [&#x24C9;][1]
This method is like `_.clone` except that it recursively clones `value`. This method is like `_.clone` except that it recursively clones `value`.
#### Since
1.0.0
#### Arguments #### Arguments
1. `value` *(&#42;)*: The value to recursively clone. 1. `value` *(&#42;)*: The value to recursively clone.
#### Returns #### Returns
*(&#42;)*: Returns the deep cloned value. *(&#42;)*: Returns the deep cloned value.
#### Example #### Example
```js ```js
var objects = [{ 'a': 1 }, { 'b': 2 }]; var objects = [{ 'a': 1 }, { 'b': 2 }];
var deep = _.cloneDeep(objects); var deep = _.cloneDeep(objects);
console.log(deep[0] === objects[0]); console.log(deep[0] === objects[0]);
// => false // => false
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_clonedeepwithvalue-customizer"></a>`_.cloneDeepWith(value, [customiz <h3 id="_clonedeepwithvalue-customizer"><code>_.cloneDeepWith(value, [customizer
er])` ])</code></h3>
<a href="#_clonedeepwithvalue-customizer">#</a> [&#x24C8;](https://github.com/lo [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L11187 "View
dash/lodash/blob/4.0.0/lodash.js#L9152 "View in source") [&#x24C9;][1] [&#x24C3; in source") [&#x24C3;](https://www.npmjs.com/package/lodash.clonedeepwith "See t
](https://www.npmjs.com/package/lodash.clonedeepwith "See the npm package") he npm package") [&#x24C9;][1]
This method is like `_.cloneWith` except that it recursively clones `value`. This method is like `_.cloneWith` except that it recursively clones `value`.
#### Since
4.0.0
#### Arguments #### Arguments
1. `value` *(&#42;)*: The value to recursively clone. 1. `value` *(&#42;)*: The value to recursively clone.
2. `[customizer]` *(Function)*: The function to customize cloning. 2. `[customizer]` *(Function)*: The function to customize cloning.
#### Returns #### Returns
*(&#42;)*: Returns the deep cloned value. *(&#42;)*: Returns the deep cloned value.
#### Example #### Example
```js ```js
function customizer(value) { function customizer(value) {
if (_.isElement(value)) { if (_.isElement(value)) {
return value.cloneNode(true); return value.cloneNode(true);
} }
} }
var el = _.cloneDeep(document.body, customizer); var el = _.cloneDeepWith(document.body, customizer);
console.log(el === document.body); console.log(el === document.body);
// => false // => false
console.log(el.nodeName); console.log(el.nodeName);
// => 'BODY' // => 'BODY'
console.log(el.childNodes.length); console.log(el.childNodes.length);
// => 20 // => 20
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_clonewithvalue-customizer"></a>`_.cloneWith(value, [customizer])` <h3 id="_clonewithvalue-customizer"><code>_.cloneWith(value, [customizer])</code
<a href="#_clonewithvalue-customizer">#</a> [&#x24C8;](https://github.com/lodash ></h3>
/lodash/blob/4.0.0/lodash.js#L9102 "View in source") [&#x24C9;][1] [&#x24C3;](ht [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L11132 "View
tps://www.npmjs.com/package/lodash.clonewith "See the npm package") in source") [&#x24C3;](https://www.npmjs.com/package/lodash.clonewith "See the n
pm package") [&#x24C9;][1]
This method is like `_.clone` except that it accepts `customizer` which This method is like `_.clone` except that it accepts `customizer` which
is invoked to produce the cloned value. If `customizer` returns `undefined` is invoked to produce the cloned value. If `customizer` returns `undefined`,
cloning is handled by the method instead. The `customizer` is invoked with cloning is handled by the method instead. The `customizer` is invoked with
up to five arguments; (value [, index|key, object, stack]). up to four arguments; *(value [, index|key, object, stack])*.
#### Since
4.0.0
#### Arguments #### Arguments
1. `value` *(&#42;)*: The value to clone. 1. `value` *(&#42;)*: The value to clone.
2. `[customizer]` *(Function)*: The function to customize cloning. 2. `[customizer]` *(Function)*: The function to customize cloning.
#### Returns #### Returns
*(&#42;)*: Returns the cloned value. *(&#42;)*: Returns the cloned value.
#### Example #### Example
```js ```js
function customizer(value) { function customizer(value) {
if (_.isElement(value)) { if (_.isElement(value)) {
return value.cloneNode(false); return value.cloneNode(false);
} }
} }
var el = _.clone(document.body, customizer); var el = _.cloneWith(document.body, customizer);
console.log(el === document.body); console.log(el === document.body);
// => false // => false
console.log(el.nodeName); console.log(el.nodeName);
// => 'BODY' // => 'BODY'
console.log(el.childNodes.length); console.log(el.childNodes.length);
// => 0 // => 0
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_eqvalue-other"></a>`_.eq(value, other)` <h3 id="_conformstoobject-source"><code>_.conformsTo(object, source)</code></h3>
<a href="#_eqvalue-other">#</a> [&#x24C8;](https://github.com/lodash/lodash/blob [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L11216 "View
/4.0.0/lodash.js#L9186 "View in source") [&#x24C9;][1] [&#x24C3;](https://www.np in source") [&#x24C3;](https://www.npmjs.com/package/lodash.conformsto "See the
mjs.com/package/lodash.eq "See the npm package") npm package") [&#x24C9;][1]
Checks if `object` conforms to `source` by invoking the predicate
properties of `source` with the corresponding property values of `object`.
<br>
<br>
**Note:** This method is equivalent to `_.conforms` when `source` is
partially applied.
#### Since
4.14.0
#### Arguments
1. `object` *(Object)*: The object to inspect.
2. `source` *(Object)*: The object of property predicates to conform to.
#### Returns
*(boolean)*: Returns `true` if `object` conforms, else `false`.
#### Example
```js
var object = { 'a': 1, 'b': 2 };
_.conformsTo(object, { 'b': function(n) { return n > 1; } });
// => true
_.conformsTo(object, { 'b': function(n) { return n > 2; } });
// => false
```
---
<!-- /div -->
Performs a [`SameValueZero`](http://ecma-international.org/ecma-262/6.0/#sec-sam <!-- div -->
evaluezero)
<h3 id="_eqvalue-other"><code>_.eq(value, other)</code></h3>
[&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L11252 "View
in source") [&#x24C3;](https://www.npmjs.com/package/lodash.eq "See the npm pack
age") [&#x24C9;][1]
Performs a
[`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
comparison between two values to determine if they are equivalent. comparison between two values to determine if they are equivalent.
#### Since
4.0.0
#### Arguments #### Arguments
1. `value` *(&#42;)*: The value to compare. 1. `value` *(&#42;)*: The value to compare.
2. `other` *(&#42;)*: The other value to compare. 2. `other` *(&#42;)*: The other value to compare.
#### Returns #### Returns
*(boolean)*: Returns `true` if the values are equivalent, else `false`. *(boolean)*: Returns `true` if the values are equivalent, else `false`.
#### Example #### Example
```js ```js
var object = { 'user': 'fred' }; var object = { 'a': 1 };
var other = { 'user': 'fred' }; var other = { 'a': 1 };
_.eq(object, object); _.eq(object, object);
// => true // => true
_.eq(object, other); _.eq(object, other);
// => false // => false
_.eq('a', 'a'); _.eq('a', 'a');
// => true // => true
_.eq('a', Object('a')); _.eq('a', Object('a'));
// => false // => false
_.eq(NaN, NaN); _.eq(NaN, NaN);
// => true // => true
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_gtvalue-other"></a>`_.gt(value, other)` <h3 id="_gtvalue-other"><code>_.gt(value, other)</code></h3>
<a href="#_gtvalue-other">#</a> [&#x24C8;](https://github.com/lodash/lodash/blob [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L11279 "View
/4.0.0/lodash.js#L9210 "View in source") [&#x24C9;][1] [&#x24C3;](https://www.np in source") [&#x24C3;](https://www.npmjs.com/package/lodash.gt "See the npm pack
mjs.com/package/lodash.gt "See the npm package") age") [&#x24C9;][1]
Checks if `value` is greater than `other`. Checks if `value` is greater than `other`.
#### Since
3.9.0
#### Arguments #### Arguments
1. `value` *(&#42;)*: The value to compare. 1. `value` *(&#42;)*: The value to compare.
2. `other` *(&#42;)*: The other value to compare. 2. `other` *(&#42;)*: The other value to compare.
#### Returns #### Returns
*(boolean)*: Returns `true` if `value` is greater than `other`, else `false`. *(boolean)*: Returns `true` if `value` is greater than `other`, else `false`.
#### Example #### Example
```js ```js
_.gt(3, 1); _.gt(3, 1);
// => true // => true
_.gt(3, 3); _.gt(3, 3);
// => false // => false
_.gt(1, 3); _.gt(1, 3);
// => false // => false
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_gtevalue-other"></a>`_.gte(value, other)` <h3 id="_gtevalue-other"><code>_.gte(value, other)</code></h3>
<a href="#_gtevalue-other">#</a> [&#x24C8;](https://github.com/lodash/lodash/blo [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L11304 "View
b/4.0.0/lodash.js#L9234 "View in source") [&#x24C9;][1] [&#x24C3;](https://www.n in source") [&#x24C3;](https://www.npmjs.com/package/lodash.gte "See the npm pac
pmjs.com/package/lodash.gte "See the npm package") kage") [&#x24C9;][1]
Checks if `value` is greater than or equal to `other`. Checks if `value` is greater than or equal to `other`.
#### Since
3.9.0
#### Arguments #### Arguments
1. `value` *(&#42;)*: The value to compare. 1. `value` *(&#42;)*: The value to compare.
2. `other` *(&#42;)*: The other value to compare. 2. `other` *(&#42;)*: The other value to compare.
#### Returns #### Returns
*(boolean)*: Returns `true` if `value` is greater than or equal to `other`, els e `false`. *(boolean)*: Returns `true` if `value` is greater than or equal to `other`, else `false`.
#### Example #### Example
```js ```js
_.gte(3, 1); _.gte(3, 1);
// => true // => true
_.gte(3, 3); _.gte(3, 3);
// => true // => true
_.gte(1, 3); _.gte(1, 3);
// => false // => false
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_isargumentsvalue"></a>`_.isArguments(value)` <h3 id="_isargumentsvalue"><code>_.isArguments(value)</code></h3>
<a href="#_isargumentsvalue">#</a> [&#x24C8;](https://github.com/lodash/lodash/b [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L11326 "View
lob/4.0.0/lodash.js#L9254 "View in source") [&#x24C9;][1] [&#x24C3;](https://www in source") [&#x24C3;](https://www.npmjs.com/package/lodash.isarguments "See the
.npmjs.com/package/lodash.isarguments "See the npm package") npm package") [&#x24C9;][1]
Checks if `value` is likely an `arguments` object. Checks if `value` is likely an `arguments` object.
#### Since
0.1.0
#### Arguments #### Arguments
1. `value` *(&#42;)*: The value to check. 1. `value` *(&#42;)*: The value to check.
#### Returns #### Returns
*(boolean)*: Returns `true` if `value` is correctly classified, else `false`. *(boolean)*: Returns `true` if `value` is an `arguments` object, else `false`.
#### Example #### Example
```js ```js
_.isArguments(function() { return arguments; }()); _.isArguments(function() { return arguments; }());
// => true // => true
_.isArguments([1, 2, 3]); _.isArguments([1, 2, 3]);
// => false // => false
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_isarrayvalue"></a>`_.isArray(value)` <h3 id="_isarrayvalue"><code>_.isArray(value)</code></h3>
<a href="#_isarrayvalue">#</a> [&#x24C8;](https://github.com/lodash/lodash/blob/ [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L11354 "View
4.0.0/lodash.js#L9283 "View in source") [&#x24C9;][1] [&#x24C3;](https://www.npm in source") [&#x24C3;](https://www.npmjs.com/package/lodash.isarray "See the npm
js.com/package/lodash.isarray "See the npm package") package") [&#x24C9;][1]
Checks if `value` is classified as an `Array` object. Checks if `value` is classified as an `Array` object.
#### Since
0.1.0
#### Arguments #### Arguments
1. `value` *(&#42;)*: The value to check. 1. `value` *(&#42;)*: The value to check.
#### Returns #### Returns
*(boolean)*: Returns `true` if `value` is correctly classified, else `false`. *(boolean)*: Returns `true` if `value` is an array, else `false`.
#### Example #### Example
```js ```js
_.isArray([1, 2, 3]); _.isArray([1, 2, 3]);
// => true // => true
_.isArray(document.body.children); _.isArray(document.body.children);
// => false // => false
_.isArray('abc'); _.isArray('abc');
// => false // => false
_.isArray(_.noop); _.isArray(_.noop);
// => false // => false
``` ```
* * * ---
<!-- /div -->
<!-- div -->
<h3 id="_isarraybuffervalue"><code>_.isArrayBuffer(value)</code></h3>
[&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L11373 "View
in source") [&#x24C3;](https://www.npmjs.com/package/lodash.isarraybuffer "See t
he npm package") [&#x24C9;][1]
Checks if `value` is classified as an `ArrayBuffer` object.
#### Since
4.3.0
#### Arguments
1. `value` *(&#42;)*: The value to check.
#### Returns
*(boolean)*: Returns `true` if `value` is an array buffer, else `false`.
#### Example
```js
_.isArrayBuffer(new ArrayBuffer(2));
// => true
_.isArrayBuffer(new Array(2));
// => false
```
---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_isarraylikevalue"></a>`_.isArrayLike(value)` <h3 id="_isarraylikevalue"><code>_.isArrayLike(value)</code></h3>
<a href="#_isarraylikevalue">#</a> [&#x24C8;](https://github.com/lodash/lodash/b [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L11400 "View
lob/4.0.0/lodash.js#L9310 "View in source") [&#x24C9;][1] [&#x24C3;](https://www in source") [&#x24C3;](https://www.npmjs.com/package/lodash.isarraylike "See the
.npmjs.com/package/lodash.isarraylike "See the npm package") npm package") [&#x24C9;][1]
Checks if `value` is array-like. A value is considered array-like if it's Checks if `value` is array-like. A value is considered array-like if it's
not a function and has a `value.length` that's an integer greater than or not a function and has a `value.length` that's an integer greater than or
equal to `0` and less than or equal to `Number.MAX_SAFE_INTEGER`. equal to `0` and less than or equal to `Number.MAX_SAFE_INTEGER`.
#### Since
4.0.0
#### Arguments #### Arguments
1. `value` *(&#42;)*: The value to check. 1. `value` *(&#42;)*: The value to check.
#### Returns #### Returns
*(boolean)*: Returns `true` if `value` is array-like, else `false`. *(boolean)*: Returns `true` if `value` is array-like, else `false`.
#### Example #### Example
```js ```js
_.isArrayLike([1, 2, 3]); _.isArrayLike([1, 2, 3]);
// => true // => true
_.isArrayLike(document.body.children); _.isArrayLike(document.body.children);
// => true // => true
_.isArrayLike('abc'); _.isArrayLike('abc');
// => true // => true
_.isArrayLike(_.noop); _.isArrayLike(_.noop);
// => false // => false
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_isarraylikeobjectvalue"></a>`_.isArrayLikeObject(value)` <h3 id="_isarraylikeobjectvalue"><code>_.isArrayLikeObject(value)</code></h3>
<a href="#_isarraylikeobjectvalue">#</a> [&#x24C8;](https://github.com/lodash/lo [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L11429 "View
dash/blob/4.0.0/lodash.js#L9339 "View in source") [&#x24C9;][1] [&#x24C3;](https in source") [&#x24C3;](https://www.npmjs.com/package/lodash.isarraylikeobject "S
://www.npmjs.com/package/lodash.isarraylikeobject "See the npm package") ee the npm package") [&#x24C9;][1]
This method is like `_.isArrayLike` except that it also checks if `value` This method is like `_.isArrayLike` except that it also checks if `value`
is an object. is an object.
#### Since
4.0.0
#### Arguments #### Arguments
1. `value` *(&#42;)*: The value to check. 1. `value` *(&#42;)*: The value to check.
#### Returns #### Returns
*(boolean)*: Returns `true` if `value` is an array-like object, else `false`. *(boolean)*: Returns `true` if `value` is an array-like object, else `false`.
#### Example #### Example
```js ```js
_.isArrayLikeObject([1, 2, 3]); _.isArrayLikeObject([1, 2, 3]);
// => true // => true
_.isArrayLikeObject(document.body.children); _.isArrayLikeObject(document.body.children);
// => true // => true
_.isArrayLikeObject('abc'); _.isArrayLikeObject('abc');
// => false // => false
_.isArrayLikeObject(_.noop); _.isArrayLikeObject(_.noop);
// => false // => false
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_isbooleanvalue"></a>`_.isBoolean(value)` <h3 id="_isbooleanvalue"><code>_.isBoolean(value)</code></h3>
<a href="#_isbooleanvalue">#</a> [&#x24C8;](https://github.com/lodash/lodash/blo [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L11450 "View
b/4.0.0/lodash.js#L9359 "View in source") [&#x24C9;][1] [&#x24C3;](https://www.n in source") [&#x24C3;](https://www.npmjs.com/package/lodash.isboolean "See the n
pmjs.com/package/lodash.isboolean "See the npm package") pm package") [&#x24C9;][1]
Checks if `value` is classified as a boolean primitive or object. Checks if `value` is classified as a boolean primitive or object.
#### Since
0.1.0
#### Arguments #### Arguments
1. `value` *(&#42;)*: The value to check. 1. `value` *(&#42;)*: The value to check.
#### Returns #### Returns
*(boolean)*: Returns `true` if `value` is correctly classified, else `false`. *(boolean)*: Returns `true` if `value` is a boolean, else `false`.
#### Example #### Example
```js ```js
_.isBoolean(false); _.isBoolean(false);
// => true // => true
_.isBoolean(null); _.isBoolean(null);
// => false // => false
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_isdatevalue"></a>`_.isDate(value)` <h3 id="_isbuffervalue"><code>_.isBuffer(value)</code></h3>
<a href="#_isdatevalue">#</a> [&#x24C8;](https://github.com/lodash/lodash/blob/4 [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L11472 "View
.0.0/lodash.js#L9380 "View in source") [&#x24C9;][1] [&#x24C3;](https://www.npmj in source") [&#x24C3;](https://www.npmjs.com/package/lodash.isbuffer "See the np
s.com/package/lodash.isdate "See the npm package") m package") [&#x24C9;][1]
Checks if `value` is a buffer.
#### Since
4.3.0
#### Arguments
1. `value` *(&#42;)*: The value to check.
#### Returns
*(boolean)*: Returns `true` if `value` is a buffer, else `false`.
#### Example
```js
_.isBuffer(new Buffer(2));
// => true
_.isBuffer(new Uint8Array(2));
// => false
```
---
<!-- /div -->
<!-- div -->
<h3 id="_isdatevalue"><code>_.isDate(value)</code></h3>
[&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L11491 "View
in source") [&#x24C3;](https://www.npmjs.com/package/lodash.isdate "See the npm
package") [&#x24C9;][1]
Checks if `value` is classified as a `Date` object. Checks if `value` is classified as a `Date` object.
#### Since
0.1.0
#### Arguments #### Arguments
1. `value` *(&#42;)*: The value to check. 1. `value` *(&#42;)*: The value to check.
#### Returns #### Returns
*(boolean)*: Returns `true` if `value` is correctly classified, else `false`. *(boolean)*: Returns `true` if `value` is a date object, else `false`.
#### Example #### Example
```js ```js
_.isDate(new Date); _.isDate(new Date);
// => true // => true
_.isDate('Mon April 23 2012'); _.isDate('Mon April 23 2012');
// => false // => false
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_iselementvalue"></a>`_.isElement(value)` <h3 id="_iselementvalue"><code>_.isElement(value)</code></h3>
<a href="#_iselementvalue">#</a> [&#x24C8;](https://github.com/lodash/lodash/blo [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L11510 "View
b/4.0.0/lodash.js#L9400 "View in source") [&#x24C9;][1] [&#x24C3;](https://www.n in source") [&#x24C3;](https://www.npmjs.com/package/lodash.iselement "See the n
pmjs.com/package/lodash.iselement "See the npm package") pm package") [&#x24C9;][1]
Checks if `value` is likely a DOM element. Checks if `value` is likely a DOM element.
#### Since
0.1.0
#### Arguments #### Arguments
1. `value` *(&#42;)*: The value to check. 1. `value` *(&#42;)*: The value to check.
#### Returns #### Returns
*(boolean)*: Returns `true` if `value` is a DOM element, else `false`. *(boolean)*: Returns `true` if `value` is a DOM element, else `false`.
#### Example #### Example
```js ```js
_.isElement(document.body); _.isElement(document.body);
// => true // => true
_.isElement('<body>'); _.isElement('<body>');
// => false // => false
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_isemptyvalue"></a>`_.isEmpty(value)` <h3 id="_isemptyvalue"><code>_.isEmpty(value)</code></h3>
<a href="#_isemptyvalue">#</a> [&#x24C8;](https://github.com/lodash/lodash/blob/ [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L11547 "View
4.0.0/lodash.js#L9431 "View in source") [&#x24C9;][1] [&#x24C3;](https://www.npm in source") [&#x24C3;](https://www.npmjs.com/package/lodash.isempty "See the npm
js.com/package/lodash.isempty "See the npm package") package") [&#x24C9;][1]
Checks if `value` is empty. A value is considered empty unless it's an Checks if `value` is an empty object, collection, map, or set.
`arguments` object, array, string, or jQuery-like collection with a length <br>
greater than `0` or an object with own enumerable properties. <br>
Objects are considered empty if they have no own enumerable string keyed
properties.
<br>
<br>
Array-like values such as `arguments` objects, arrays, buffers, strings, or
jQuery-like collections are considered empty if they have a `length` of `0`.
Similarly, maps and sets are considered empty if they have a `size` of `0`.
#### Since
0.1.0
#### Arguments #### Arguments
1. `value` *(Array|Object|string)*: The value to inspect. 1. `value` *(&#42;)*: The value to check.
#### Returns #### Returns
*(boolean)*: Returns `true` if `value` is empty, else `false`. *(boolean)*: Returns `true` if `value` is empty, else `false`.
#### Example #### Example
```js ```js
_.isEmpty(null); _.isEmpty(null);
// => true // => true
_.isEmpty(true); _.isEmpty(true);
// => true // => true
_.isEmpty(1); _.isEmpty(1);
// => true // => true
_.isEmpty([1, 2, 3]); _.isEmpty([1, 2, 3]);
// => false // => false
_.isEmpty({ 'a': 1 }); _.isEmpty({ 'a': 1 });
// => false // => false
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_isequalvalue-other"></a>`_.isEqual(value, other)` <h3 id="_isequalvalue-other"><code>_.isEqual(value, other)</code></h3>
<a href="#_isequalvalue-other">#</a> [&#x24C8;](https://github.com/lodash/lodash [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L11599 "View
/blob/4.0.0/lodash.js#L9464 "View in source") [&#x24C9;][1] [&#x24C3;](https://w in source") [&#x24C3;](https://www.npmjs.com/package/lodash.isequal "See the npm
ww.npmjs.com/package/lodash.isequal "See the npm package") package") [&#x24C9;][1]
Performs a deep comparison between two values to determine if they are Performs a deep comparison between two values to determine if they are
equivalent. equivalent.
<br> <br>
<br> <br>
**Note:** This method supports comparing arrays, array buffers, booleans, **Note:** This method supports comparing arrays, array buffers, booleans,
date objects, error objects, maps, numbers, `Object` objects, regexes, date objects, error objects, maps, numbers, `Object` objects, regexes,
sets, strings, symbols, and typed arrays. `Object` objects are compared sets, strings, symbols, and typed arrays. `Object` objects are compared
by their own, not inherited, enumerable properties. Functions and DOM by their own, not inherited, enumerable properties. Functions and DOM
nodes are **not** supported. nodes are compared by strict equality, i.e. `===`.
#### Since
0.1.0
#### Arguments #### Arguments
1. `value` *(&#42;)*: The value to compare. 1. `value` *(&#42;)*: The value to compare.
2. `other` *(&#42;)*: The other value to compare. 2. `other` *(&#42;)*: The other value to compare.
#### Returns #### Returns
*(boolean)*: Returns `true` if the values are equivalent, else `false`. *(boolean)*: Returns `true` if the values are equivalent, else `false`.
#### Example #### Example
```js ```js
var object = { 'user': 'fred' }; var object = { 'a': 1 };
var other = { 'user': 'fred' }; var other = { 'a': 1 };
_.isEqual(object, other); _.isEqual(object, other);
// => true // => true
object === other; object === other;
// => false // => false
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_isequalwithvalue-other-customizer"></a>`_.isEqualWith(value, other, <h3 id="_isequalwithvalue-other-customizer"><code>_.isEqualWith(value, other, [c
[customizer])` ustomizer])</code></h3>
<a href="#_isequalwithvalue-other-customizer">#</a> [&#x24C8;](https://github.co [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L11635 "View
m/lodash/lodash/blob/4.0.0/lodash.js#L9499 "View in source") [&#x24C9;][1] [&#x2 in source") [&#x24C3;](https://www.npmjs.com/package/lodash.isequalwith "See the
4C3;](https://www.npmjs.com/package/lodash.isequalwith "See the npm package") npm package") [&#x24C9;][1]
This method is like `_.isEqual` except that it accepts `customizer` which
is invoked to compare values. If `customizer` returns `undefined`, comparisons
are handled by the method instead. The `customizer` is invoked with up to
six arguments: *(objValue, othValue [, index|key, object, other, stack])*.
This method is like `_.isEqual` except that it accepts `customizer` which is #### Since
invoked to compare values. If `customizer` returns `undefined` comparisons are 4.0.0
handled by the method instead. The `customizer` is invoked with up to seven argu
ments:<br>
(objValue, othValue [, index|key, object, other, stack]).
#### Arguments #### Arguments
1. `value` *(&#42;)*: The value to compare. 1. `value` *(&#42;)*: The value to compare.
2. `other` *(&#42;)*: The other value to compare. 2. `other` *(&#42;)*: The other value to compare.
3. `[customizer]` *(Function)*: The function to customize comparisons. 3. `[customizer]` *(Function)*: The function to customize comparisons.
#### Returns #### Returns
*(boolean)*: Returns `true` if the values are equivalent, else `false`. *(boolean)*: Returns `true` if the values are equivalent, else `false`.
#### Example #### Example
```js ```js
function isGreeting(value) { function isGreeting(value) {
return /^h(?:i|ello)$/.test(value); return /^h(?:i|ello)$/.test(value);
} }
function customizer(objValue, othValue) { function customizer(objValue, othValue) {
if (isGreeting(objValue) && isGreeting(othValue)) { if (isGreeting(objValue) && isGreeting(othValue)) {
return true; return true;
} }
} }
var array = ['hello', 'goodbye']; var array = ['hello', 'goodbye'];
var other = ['hi', 'goodbye']; var other = ['hi', 'goodbye'];
_.isEqualWith(array, other, customizer); _.isEqualWith(array, other, customizer);
// => true // => true
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_iserrorvalue"></a>`_.isError(value)` <h3 id="_iserrorvalue"><code>_.isError(value)</code></h3>
<a href="#_iserrorvalue">#</a> [&#x24C8;](https://github.com/lodash/lodash/blob/ [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L11659 "View
4.0.0/lodash.js#L9522 "View in source") [&#x24C9;][1] [&#x24C3;](https://www.npm in source") [&#x24C3;](https://www.npmjs.com/package/lodash.iserror "See the npm
js.com/package/lodash.iserror "See the npm package") package") [&#x24C9;][1]
Checks if `value` is an `Error`, `EvalError`, `RangeError`, `ReferenceError`, Checks if `value` is an `Error`, `EvalError`, `RangeError`, `ReferenceError`,
`SyntaxError`, `TypeError`, or `URIError` object. `SyntaxError`, `TypeError`, or `URIError` object.
#### Since
3.0.0
#### Arguments #### Arguments
1. `value` *(&#42;)*: The value to check. 1. `value` *(&#42;)*: The value to check.
#### Returns #### Returns
*(boolean)*: Returns `true` if `value` is an error object, else `false`. *(boolean)*: Returns `true` if `value` is an error object, else `false`.
#### Example #### Example
```js ```js
_.isError(new Error); _.isError(new Error);
// => true // => true
_.isError(Error); _.isError(Error);
// => false // => false
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_isfinitevalue"></a>`_.isFinite(value)` <h3 id="_isfinitevalue"><code>_.isFinite(value)</code></h3>
<a href="#_isfinitevalue">#</a> [&#x24C8;](https://github.com/lodash/lodash/blob [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L11694 "View
/4.0.0/lodash.js#L9551 "View in source") [&#x24C9;][1] [&#x24C3;](https://www.np in source") [&#x24C3;](https://www.npmjs.com/package/lodash.isfinite "See the np
mjs.com/package/lodash.isfinite "See the npm package") m package") [&#x24C9;][1]
Checks if `value` is a finite primitive number. Checks if `value` is a finite primitive number.
<br> <br>
<br> <br>
**Note:** This method is based on [`Number.isFinite`](https://mdn.io/Number/isFi **Note:** This method is based on
nite). [`Number.isFinite`](https://mdn.io/Number/isFinite).
#### Since
0.1.0
#### Arguments #### Arguments
1. `value` *(&#42;)*: The value to check. 1. `value` *(&#42;)*: The value to check.
#### Returns #### Returns
*(boolean)*: Returns `true` if `value` is a finite number, else `false`. *(boolean)*: Returns `true` if `value` is a finite number, else `false`.
#### Example #### Example
```js ```js
_.isFinite(3); _.isFinite(3);
// => true // => true
_.isFinite(Number.MAX_VALUE); _.isFinite(Number.MIN_VALUE);
// => true
_.isFinite(3.14);
// => true // => true
_.isFinite(Infinity); _.isFinite(Infinity);
// => false // => false
_.isFinite('3');
// => false
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_isfunctionvalue"></a>`_.isFunction(value)` <h3 id="_isfunctionvalue"><code>_.isFunction(value)</code></h3>
<a href="#_isfunctionvalue">#</a> [&#x24C8;](https://github.com/lodash/lodash/bl [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L11715 "View
ob/4.0.0/lodash.js#L9571 "View in source") [&#x24C9;][1] [&#x24C3;](https://www. in source") [&#x24C3;](https://www.npmjs.com/package/lodash.isfunction "See the
npmjs.com/package/lodash.isfunction "See the npm package") npm package") [&#x24C9;][1]
Checks if `value` is classified as a `Function` object. Checks if `value` is classified as a `Function` object.
#### Since
0.1.0
#### Arguments #### Arguments
1. `value` *(&#42;)*: The value to check. 1. `value` *(&#42;)*: The value to check.
#### Returns #### Returns
*(boolean)*: Returns `true` if `value` is correctly classified, else `false`. *(boolean)*: Returns `true` if `value` is a function, else `false`.
#### Example #### Example
```js ```js
_.isFunction(_); _.isFunction(_);
// => true // => true
_.isFunction(/abc/); _.isFunction(/abc/);
// => false // => false
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_isintegervalue"></a>`_.isInteger(value)` <h3 id="_isintegervalue"><code>_.isInteger(value)</code></h3>
<a href="#_isintegervalue">#</a> [&#x24C8;](https://github.com/lodash/lodash/blo [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L11751 "View
b/4.0.0/lodash.js#L9603 "View in source") [&#x24C9;][1] [&#x24C3;](https://www.n in source") [&#x24C3;](https://www.npmjs.com/package/lodash.isinteger "See the n
pmjs.com/package/lodash.isinteger "See the npm package") pm package") [&#x24C9;][1]
Checks if `value` is an integer. Checks if `value` is an integer.
<br> <br>
<br> <br>
**Note:** This method is based on [`Number.isInteger`](https://mdn.io/Number/isI **Note:** This method is based on
nteger). [`Number.isInteger`](https://mdn.io/Number/isInteger).
#### Since
4.0.0
#### Arguments #### Arguments
1. `value` *(&#42;)*: The value to check. 1. `value` *(&#42;)*: The value to check.
#### Returns #### Returns
*(boolean)*: Returns `true` if `value` is an integer, else `false`. *(boolean)*: Returns `true` if `value` is an integer, else `false`.
#### Example #### Example
```js ```js
_.isInteger(3); _.isInteger(3);
// => true // => true
_.isInteger(Number.MIN_VALUE); _.isInteger(Number.MIN_VALUE);
// => false // => false
_.isInteger(Infinity); _.isInteger(Infinity);
// => false // => false
_.isInteger('3'); _.isInteger('3');
// => false // => false
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_islengthvalue"></a>`_.isLength(value)` <h3 id="_islengthvalue"><code>_.isLength(value)</code></h3>
<a href="#_islengthvalue">#</a> [&#x24C8;](https://github.com/lodash/lodash/blob [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L11781 "View
/4.0.0/lodash.js#L9631 "View in source") [&#x24C9;][1] [&#x24C3;](https://www.np in source") [&#x24C3;](https://www.npmjs.com/package/lodash.islength "See the np
mjs.com/package/lodash.islength "See the npm package") m package") [&#x24C9;][1]
Checks if `value` is a valid array-like length. Checks if `value` is a valid array-like length.
<br> <br>
<br> <br>
**Note:** This function is loosely based on [`ToLength`](http://ecma-internation **Note:** This method is loosely based on
al.org/ecma-262/6.0/#sec-tolength). [`ToLength`](http://ecma-international.org/ecma-262/7.0/#sec-tolength).
#### Since
4.0.0
#### Arguments #### Arguments
1. `value` *(&#42;)*: The value to check. 1. `value` *(&#42;)*: The value to check.
#### Returns #### Returns
*(boolean)*: Returns `true` if `value` is a valid length, else `false`. *(boolean)*: Returns `true` if `value` is a valid length, else `false`.
#### Example #### Example
```js ```js
_.isLength(3); _.isLength(3);
// => true // => true
_.isLength(Number.MIN_VALUE); _.isLength(Number.MIN_VALUE);
// => false // => false
_.isLength(Infinity); _.isLength(Infinity);
// => false // => false
_.isLength('3'); _.isLength('3');
// => false // => false
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_ismatchobject-source"></a>`_.isMatch(object, source)` <h3 id="_ismapvalue"><code>_.isMap(value)</code></h3>
<a href="#_ismatchobject-source">#</a> [&#x24C8;](https://github.com/lodash/loda [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L11861 "View
sh/blob/4.0.0/lodash.js#L9714 "View in source") [&#x24C9;][1] [&#x24C3;](https:/ in source") [&#x24C3;](https://www.npmjs.com/package/lodash.ismap "See the npm p
/www.npmjs.com/package/lodash.ismatch "See the npm package") ackage") [&#x24C9;][1]
Checks if `value` is classified as a `Map` object.
Performs a deep comparison between `object` and `source` to determine if #### Since
`object` contains equivalent property values. 4.3.0
#### Arguments
1. `value` *(&#42;)*: The value to check.
#### Returns
*(boolean)*: Returns `true` if `value` is a map, else `false`.
#### Example
```js
_.isMap(new Map);
// => true
_.isMap(new WeakMap);
// => false
```
---
<!-- /div -->
<!-- div -->
<h3 id="_ismatchobject-source"><code>_.isMatch(object, source)</code></h3>
[&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L11891 "View
in source") [&#x24C3;](https://www.npmjs.com/package/lodash.ismatch "See the npm
package") [&#x24C9;][1]
Performs a partial deep comparison between `object` and `source` to
determine if `object` contains equivalent property values.
<br> <br>
<br> <br>
**Note:** This method supports comparing the same values as `_.isEqual`. **Note:** This method is equivalent to `_.matches` when `source` is
partially applied.
<br>
<br>
Partial comparisons will match empty array and empty object `source`
values against any array or object value, respectively. See `_.isEqual`
for a list of supported value comparisons.
#### Since
3.0.0
#### Arguments #### Arguments
1. `object` *(Object)*: The object to inspect. 1. `object` *(Object)*: The object to inspect.
2. `source` *(Object)*: The object of property values to match. 2. `source` *(Object)*: The object of property values to match.
#### Returns #### Returns
*(boolean)*: Returns `true` if `object` is a match, else `false`. *(boolean)*: Returns `true` if `object` is a match, else `false`.
#### Example #### Example
```js ```js
var object = { 'user': 'fred', 'age': 40 }; var object = { 'a': 1, 'b': 2 };
_.isMatch(object, { 'age': 40 }); _.isMatch(object, { 'b': 2 });
// => true // => true
_.isMatch(object, { 'age': 36 }); _.isMatch(object, { 'b': 1 });
// => false // => false
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_ismatchwithobject-source-customizer"></a>`_.isMatchWith(object, sour <h3 id="_ismatchwithobject-source-customizer"><code>_.isMatchWith(object, source
ce, [customizer])` , [customizer])</code></h3>
<a href="#_ismatchwithobject-source-customizer">#</a> [&#x24C8;](https://github. [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L11927 "View
com/lodash/lodash/blob/4.0.0/lodash.js#L9749 "View in source") [&#x24C9;][1] [&# in source") [&#x24C3;](https://www.npmjs.com/package/lodash.ismatchwith "See the
x24C3;](https://www.npmjs.com/package/lodash.ismatchwith "See the npm package") npm package") [&#x24C9;][1]
This method is like `_.isMatch` except that it accepts `customizer` which This method is like `_.isMatch` except that it accepts `customizer` which
is invoked to compare values. If `customizer` returns `undefined` comparisons is invoked to compare values. If `customizer` returns `undefined`, comparisons
are handled by the method instead. The `customizer` is invoked with three are handled by the method instead. The `customizer` is invoked with five
arguments: (objValue, srcValue, index|key, object, source). arguments: *(objValue, srcValue, index|key, object, source)*.
#### Since
4.0.0
#### Arguments #### Arguments
1. `object` *(Object)*: The object to inspect. 1. `object` *(Object)*: The object to inspect.
2. `source` *(Object)*: The object of property values to match. 2. `source` *(Object)*: The object of property values to match.
3. `[customizer]` *(Function)*: The function to customize comparisons. 3. `[customizer]` *(Function)*: The function to customize comparisons.
#### Returns #### Returns
*(boolean)*: Returns `true` if `object` is a match, else `false`. *(boolean)*: Returns `true` if `object` is a match, else `false`.
#### Example #### Example
```js ```js
function isGreeting(value) { function isGreeting(value) {
return /^h(?:i|ello)$/.test(value); return /^h(?:i|ello)$/.test(value);
} }
function customizer(objValue, srcValue) { function customizer(objValue, srcValue) {
if (isGreeting(objValue) && isGreeting(srcValue)) { if (isGreeting(objValue) && isGreeting(srcValue)) {
return true; return true;
} }
} }
var object = { 'greeting': 'hello' }; var object = { 'greeting': 'hello' };
var source = { 'greeting': 'hi' }; var source = { 'greeting': 'hi' };
_.isMatchWith(object, source, customizer); _.isMatchWith(object, source, customizer);
// => true // => true
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_isnanvalue"></a>`_.isNaN(value)` <h3 id="_isnanvalue"><code>_.isNaN(value)</code></h3>
<a href="#_isnanvalue">#</a> [&#x24C8;](https://github.com/lodash/lodash/blob/4. [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L11960 "View
0.0/lodash.js#L9779 "View in source") [&#x24C9;][1] [&#x24C3;](https://www.npmjs in source") [&#x24C3;](https://www.npmjs.com/package/lodash.isnan "See the npm p
.com/package/lodash.isnan "See the npm package") ackage") [&#x24C9;][1]
Checks if `value` is `NaN`. Checks if `value` is `NaN`.
<br> <br>
<br> <br>
**Note:** This method is not the same as [`isNaN`](https://es5.github.io/#x15.1. **Note:** This method is based on
2.4) [`Number.isNaN`](https://mdn.io/Number/isNaN) and is not the same as
which returns `true` for `undefined` and other non-numeric values. global [`isNaN`](https://mdn.io/isNaN) which returns `true` for
`undefined` and other non-number values.
#### Since
0.1.0
#### Arguments #### Arguments
1. `value` *(&#42;)*: The value to check. 1. `value` *(&#42;)*: The value to check.
#### Returns #### Returns
*(boolean)*: Returns `true` if `value` is `NaN`, else `false`. *(boolean)*: Returns `true` if `value` is `NaN`, else `false`.
#### Example #### Example
```js ```js
_.isNaN(NaN); _.isNaN(NaN);
// => true // => true
_.isNaN(new Number(NaN)); _.isNaN(new Number(NaN));
// => true // => true
isNaN(undefined); isNaN(undefined);
// => true // => true
_.isNaN(undefined); _.isNaN(undefined);
// => false // => false
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_isnativevalue"></a>`_.isNative(value)` <h3 id="_isnativevalue"><code>_.isNative(value)</code></h3>
<a href="#_isnativevalue">#</a> [&#x24C8;](https://github.com/lodash/lodash/blob [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L11993 "View
/4.0.0/lodash.js#L9801 "View in source") [&#x24C9;][1] [&#x24C3;](https://www.np in source") [&#x24C3;](https://www.npmjs.com/package/lodash.isnative "See the np
mjs.com/package/lodash.isnative "See the npm package") m package") [&#x24C9;][1]
Checks if `value` is a pristine native function.
<br>
<br>
**Note:** This method can't reliably detect native functions in the presence
of the core-js package because core-js circumvents this kind of detection.
Despite multiple requests, the core-js maintainer has made it clear: any
attempt to fix the detection will be obstructed. As a result, we're left
with little choice but to throw an error. Unfortunately, this also affects
packages, like [babel-polyfill](https://www.npmjs.com/package/babel-polyfill),
which rely on core-js.
Checks if `value` is a native function. #### Since
3.0.0
#### Arguments #### Arguments
1. `value` *(&#42;)*: The value to check. 1. `value` *(&#42;)*: The value to check.
#### Returns #### Returns
*(boolean)*: Returns `true` if `value` is a native function, else `false`. *(boolean)*: Returns `true` if `value` is a native function, else `false`.
#### Example #### Example
```js ```js
_.isNative(Array.prototype.push); _.isNative(Array.prototype.push);
// => true // => true
_.isNative(_); _.isNative(_);
// => false // => false
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_isnilvalue"></a>`_.isNil(value)` <h3 id="_isnilvalue"><code>_.isNil(value)</code></h3>
<a href="#_isnilvalue">#</a> [&#x24C8;](https://github.com/lodash/lodash/blob/4. [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L12041 "View
0.0/lodash.js#L9851 "View in source") [&#x24C9;][1] [&#x24C3;](https://www.npmjs in source") [&#x24C3;](https://www.npmjs.com/package/lodash.isnil "See the npm p
.com/package/lodash.isnil "See the npm package") ackage") [&#x24C9;][1]
Checks if `value` is `null` or `undefined`. Checks if `value` is `null` or `undefined`.
#### Since
4.0.0
#### Arguments #### Arguments
1. `value` *(&#42;)*: The value to check. 1. `value` *(&#42;)*: The value to check.
#### Returns #### Returns
*(boolean)*: Returns `true` if `value` is nullish, else `false`. *(boolean)*: Returns `true` if `value` is nullish, else `false`.
#### Example #### Example
```js ```js
_.isNil(null); _.isNil(null);
// => true // => true
_.isNil(void 0); _.isNil(void 0);
// => true // => true
_.isNil(NaN); _.isNil(NaN);
// => false // => false
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_isnullvalue"></a>`_.isNull(value)` <h3 id="_isnullvalue"><code>_.isNull(value)</code></h3>
<a href="#_isnullvalue">#</a> [&#x24C8;](https://github.com/lodash/lodash/blob/4 [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L12017 "View
.0.0/lodash.js#L9828 "View in source") [&#x24C9;][1] [&#x24C3;](https://www.npmj in source") [&#x24C3;](https://www.npmjs.com/package/lodash.isnull "See the npm
s.com/package/lodash.isnull "See the npm package") package") [&#x24C9;][1]
Checks if `value` is `null`. Checks if `value` is `null`.
#### Since
0.1.0
#### Arguments #### Arguments
1. `value` *(&#42;)*: The value to check. 1. `value` *(&#42;)*: The value to check.
#### Returns #### Returns
*(boolean)*: Returns `true` if `value` is `null`, else `false`. *(boolean)*: Returns `true` if `value` is `null`, else `false`.
#### Example #### Example
```js ```js
_.isNull(null); _.isNull(null);
// => true // => true
_.isNull(void 0); _.isNull(void 0);
// => false // => false
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_isnumbervalue"></a>`_.isNumber(value)` <h3 id="_isnumbervalue"><code>_.isNumber(value)</code></h3>
<a href="#_isnumbervalue">#</a> [&#x24C8;](https://github.com/lodash/lodash/blob [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L12071 "View
/4.0.0/lodash.js#L9880 "View in source") [&#x24C9;][1] [&#x24C3;](https://www.np in source") [&#x24C3;](https://www.npmjs.com/package/lodash.isnumber "See the np
mjs.com/package/lodash.isnumber "See the npm package") m package") [&#x24C9;][1]
Checks if `value` is classified as a `Number` primitive or object. Checks if `value` is classified as a `Number` primitive or object.
<br> <br>
<br> <br>
**Note:** To exclude `Infinity`, `-Infinity`, and `NaN`, which are classified **Note:** To exclude `Infinity`, `-Infinity`, and `NaN`, which are
as numbers, use the `_.isFinite` method. classified as numbers, use the `_.isFinite` method.
#### Since
0.1.0
#### Arguments #### Arguments
1. `value` *(&#42;)*: The value to check. 1. `value` *(&#42;)*: The value to check.
#### Returns #### Returns
*(boolean)*: Returns `true` if `value` is correctly classified, else `false`. *(boolean)*: Returns `true` if `value` is a number, else `false`.
#### Example #### Example
```js ```js
_.isNumber(3); _.isNumber(3);
// => true // => true
_.isNumber(Number.MIN_VALUE); _.isNumber(Number.MIN_VALUE);
// => true // => true
_.isNumber(Infinity); _.isNumber(Infinity);
// => true // => true
_.isNumber('3'); _.isNumber('3');
// => false // => false
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_isobjectvalue"></a>`_.isObject(value)` <h3 id="_isobjectvalue"><code>_.isObject(value)</code></h3>
<a href="#_isobjectvalue">#</a> [&#x24C8;](https://github.com/lodash/lodash/blob [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L11811 "View
/4.0.0/lodash.js#L9658 "View in source") [&#x24C9;][1] [&#x24C3;](https://www.np in source") [&#x24C3;](https://www.npmjs.com/package/lodash.isobject "See the np
mjs.com/package/lodash.isobject "See the npm package") m package") [&#x24C9;][1]
Checks if `value` is the
[language type](http://www.ecma-international.org/ecma-262/7.0/#sec-ecmascript-l
anguage-types)
of `Object`. *(e.g. arrays, functions, objects, regexes, `new Number(0)`, and `n
ew String('')`)*
Checks if `value` is the [language type](https://es5.github.io/#x8) of `Object`. #### Since
(e.g. arrays, functions, objects, regexes, `new Number(0)`, and `new String('')` 0.1.0
)
#### Arguments #### Arguments
1. `value` *(&#42;)*: The value to check. 1. `value` *(&#42;)*: The value to check.
#### Returns #### Returns
*(boolean)*: Returns `true` if `value` is an object, else `false`. *(boolean)*: Returns `true` if `value` is an object, else `false`.
#### Example #### Example
```js ```js
_.isObject({}); _.isObject({});
// => true // => true
_.isObject([1, 2, 3]); _.isObject([1, 2, 3]);
// => true // => true
_.isObject(_.noop); _.isObject(_.noop);
// => true // => true
_.isObject(null); _.isObject(null);
// => false // => false
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_isobjectlikevalue"></a>`_.isObjectLike(value)` <h3 id="_isobjectlikevalue"><code>_.isObjectLike(value)</code></h3>
<a href="#_isobjectlikevalue">#</a> [&#x24C8;](https://github.com/lodash/lodash/ [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L11840 "View
blob/4.0.0/lodash.js#L9688 "View in source") [&#x24C9;][1] [&#x24C3;](https://ww in source") [&#x24C3;](https://www.npmjs.com/package/lodash.isobjectlike "See th
w.npmjs.com/package/lodash.isobjectlike "See the npm package") e npm package") [&#x24C9;][1]
Checks if `value` is object-like. A value is object-like if it's not `null` Checks if `value` is object-like. A value is object-like if it's not `null`
and has a `typeof` result of "object". and has a `typeof` result of "object".
#### Since
4.0.0
#### Arguments #### Arguments
1. `value` *(&#42;)*: The value to check. 1. `value` *(&#42;)*: The value to check.
#### Returns #### Returns
*(boolean)*: Returns `true` if `value` is object-like, else `false`. *(boolean)*: Returns `true` if `value` is object-like, else `false`.
#### Example #### Example
```js ```js
_.isObjectLike({}); _.isObjectLike({});
// => true // => true
_.isObjectLike([1, 2, 3]); _.isObjectLike([1, 2, 3]);
// => true // => true
_.isObjectLike(_.noop); _.isObjectLike(_.noop);
// => false // => false
_.isObjectLike(null); _.isObjectLike(null);
// => false // => false
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_isplainobjectvalue"></a>`_.isPlainObject(value)` <h3 id="_isplainobjectvalue"><code>_.isPlainObject(value)</code></h3>
<a href="#_isplainobjectvalue">#</a> [&#x24C8;](https://github.com/lodash/lodash [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L12104 "View
/blob/4.0.0/lodash.js#L9912 "View in source") [&#x24C9;][1] [&#x24C3;](https://w in source") [&#x24C3;](https://www.npmjs.com/package/lodash.isplainobject "See t
ww.npmjs.com/package/lodash.isplainobject "See the npm package") he npm package") [&#x24C9;][1]
Checks if `value` is a plain object, that is, an object created by the Checks if `value` is a plain object, that is, an object created by the
`Object` constructor or one with a `[[Prototype]]` of `null`. `Object` constructor or one with a `[[Prototype]]` of `null`.
#### Since
0.8.0
#### Arguments #### Arguments
1. `value` *(&#42;)*: The value to check. 1. `value` *(&#42;)*: The value to check.
#### Returns #### Returns
*(boolean)*: Returns `true` if `value` is a plain object, else `false`. *(boolean)*: Returns `true` if `value` is a plain object, else `false`.
#### Example #### Example
```js ```js
function Foo() { function Foo() {
this.a = 1; this.a = 1;
} }
_.isPlainObject(new Foo); _.isPlainObject(new Foo);
// => false // => false
_.isPlainObject([1, 2, 3]); _.isPlainObject([1, 2, 3]);
// => false // => false
_.isPlainObject({ 'x': 0, 'y': 0 }); _.isPlainObject({ 'x': 0, 'y': 0 });
// => true // => true
_.isPlainObject(Object.create(null)); _.isPlainObject(Object.create(null));
// => true // => true
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_isregexpvalue"></a>`_.isRegExp(value)` <h3 id="_isregexpvalue"><code>_.isRegExp(value)</code></h3>
<a href="#_isregexpvalue">#</a> [&#x24C8;](https://github.com/lodash/lodash/blob [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L12134 "View
/4.0.0/lodash.js#L9944 "View in source") [&#x24C9;][1] [&#x24C3;](https://www.np in source") [&#x24C3;](https://www.npmjs.com/package/lodash.isregexp "See the np
mjs.com/package/lodash.isregexp "See the npm package") m package") [&#x24C9;][1]
Checks if `value` is classified as a `RegExp` object. Checks if `value` is classified as a `RegExp` object.
#### Since
0.1.0
#### Arguments #### Arguments
1. `value` *(&#42;)*: The value to check. 1. `value` *(&#42;)*: The value to check.
#### Returns #### Returns
*(boolean)*: Returns `true` if `value` is correctly classified, else `false`. *(boolean)*: Returns `true` if `value` is a regexp, else `false`.
#### Example #### Example
```js ```js
_.isRegExp(/abc/); _.isRegExp(/abc/);
// => true // => true
_.isRegExp('/abc/'); _.isRegExp('/abc/');
// => false // => false
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_issafeintegervalue"></a>`_.isSafeInteger(value)` <h3 id="_issafeintegervalue"><code>_.isSafeInteger(value)</code></h3>
<a href="#_issafeintegervalue">#</a> [&#x24C8;](https://github.com/lodash/lodash [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L12163 "View
/blob/4.0.0/lodash.js#L9973 "View in source") [&#x24C9;][1] [&#x24C3;](https://w in source") [&#x24C3;](https://www.npmjs.com/package/lodash.issafeinteger "See t
ww.npmjs.com/package/lodash.issafeinteger "See the npm package") he npm package") [&#x24C9;][1]
Checks if `value` is a safe integer. An integer is safe if it's an IEEE-754 Checks if `value` is a safe integer. An integer is safe if it's an IEEE-754
double precision number which isn't the result of a rounded unsafe integer. double precision number which isn't the result of a rounded unsafe integer.
<br> <br>
<br> <br>
**Note:** This method is based on [`Number.isSafeInteger`](https://mdn.io/Number **Note:** This method is based on
/isSafeInteger). [`Number.isSafeInteger`](https://mdn.io/Number/isSafeInteger).
#### Since
4.0.0
#### Arguments #### Arguments
1. `value` *(&#42;)*: The value to check. 1. `value` *(&#42;)*: The value to check.
#### Returns #### Returns
*(boolean)*: Returns `true` if `value` is a safe integer, else `false`. *(boolean)*: Returns `true` if `value` is a safe integer, else `false`.
#### Example #### Example
```js ```js
_.isSafeInteger(3); _.isSafeInteger(3);
// => true // => true
_.isSafeInteger(Number.MIN_VALUE); _.isSafeInteger(Number.MIN_VALUE);
// => false // => false
_.isSafeInteger(Infinity); _.isSafeInteger(Infinity);
// => false // => false
_.isSafeInteger('3'); _.isSafeInteger('3');
// => false // => false
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_isstringvalue"></a>`_.isString(value)` <h3 id="_issetvalue"><code>_.isSet(value)</code></h3>
<a href="#_isstringvalue">#</a> [&#x24C8;](https://github.com/lodash/lodash/blob [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L12184 "View
/4.0.0/lodash.js#L9993 "View in source") [&#x24C9;][1] [&#x24C3;](https://www.np in source") [&#x24C3;](https://www.npmjs.com/package/lodash.isset "See the npm p
mjs.com/package/lodash.isstring "See the npm package") ackage") [&#x24C9;][1]
Checks if `value` is classified as a `Set` object.
#### Since
4.3.0
#### Arguments
1. `value` *(&#42;)*: The value to check.
#### Returns
*(boolean)*: Returns `true` if `value` is a set, else `false`.
#### Example
```js
_.isSet(new Set);
// => true
_.isSet(new WeakSet);
// => false
```
---
<!-- /div -->
<!-- div -->
<h3 id="_isstringvalue"><code>_.isString(value)</code></h3>
[&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L12203 "View
in source") [&#x24C3;](https://www.npmjs.com/package/lodash.isstring "See the np
m package") [&#x24C9;][1]
Checks if `value` is classified as a `String` primitive or object. Checks if `value` is classified as a `String` primitive or object.
#### Since
0.1.0
#### Arguments #### Arguments
1. `value` *(&#42;)*: The value to check. 1. `value` *(&#42;)*: The value to check.
#### Returns #### Returns
*(boolean)*: Returns `true` if `value` is correctly classified, else `false`. *(boolean)*: Returns `true` if `value` is a string, else `false`.
#### Example #### Example
```js ```js
_.isString('abc'); _.isString('abc');
// => true // => true
_.isString(1); _.isString(1);
// => false // => false
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_issymbolvalue"></a>`_.isSymbol(value)` <h3 id="_issymbolvalue"><code>_.isSymbol(value)</code></h3>
<a href="#_issymbolvalue">#</a> [&#x24C8;](https://github.com/lodash/lodash/blob [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L12225 "View
/4.0.0/lodash.js#L10014 "View in source") [&#x24C9;][1] [&#x24C3;](https://www.n in source") [&#x24C3;](https://www.npmjs.com/package/lodash.issymbol "See the np
pmjs.com/package/lodash.issymbol "See the npm package") m package") [&#x24C9;][1]
Checks if `value` is classified as a `Symbol` primitive or object. Checks if `value` is classified as a `Symbol` primitive or object.
#### Since
4.0.0
#### Arguments #### Arguments
1. `value` *(&#42;)*: The value to check. 1. `value` *(&#42;)*: The value to check.
#### Returns #### Returns
*(boolean)*: Returns `true` if `value` is correctly classified, else `false`. *(boolean)*: Returns `true` if `value` is a symbol, else `false`.
#### Example #### Example
```js ```js
_.isSymbol(Symbol.iterator); _.isSymbol(Symbol.iterator);
// => true // => true
_.isSymbol('abc'); _.isSymbol('abc');
// => false // => false
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_istypedarrayvalue"></a>`_.isTypedArray(value)` <h3 id="_istypedarrayvalue"><code>_.isTypedArray(value)</code></h3>
<a href="#_istypedarrayvalue">#</a> [&#x24C8;](https://github.com/lodash/lodash/ [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L12247 "View
blob/4.0.0/lodash.js#L10035 "View in source") [&#x24C9;][1] [&#x24C3;](https://w in source") [&#x24C3;](https://www.npmjs.com/package/lodash.istypedarray "See th
ww.npmjs.com/package/lodash.istypedarray "See the npm package") e npm package") [&#x24C9;][1]
Checks if `value` is classified as a typed array. Checks if `value` is classified as a typed array.
#### Since
3.0.0
#### Arguments #### Arguments
1. `value` *(&#42;)*: The value to check. 1. `value` *(&#42;)*: The value to check.
#### Returns #### Returns
*(boolean)*: Returns `true` if `value` is correctly classified, else `false`. *(boolean)*: Returns `true` if `value` is a typed array, else `false`.
#### Example #### Example
```js ```js
_.isTypedArray(new Uint8Array); _.isTypedArray(new Uint8Array);
// => true // => true
_.isTypedArray([]); _.isTypedArray([]);
// => false // => false
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_isundefinedvalue"></a>`_.isUndefined(value)` <h3 id="_isundefinedvalue"><code>_.isUndefined(value)</code></h3>
<a href="#_isundefinedvalue">#</a> [&#x24C8;](https://github.com/lodash/lodash/b [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L12266 "View
lob/4.0.0/lodash.js#L10055 "View in source") [&#x24C9;][1] [&#x24C3;](https://ww in source") [&#x24C3;](https://www.npmjs.com/package/lodash.isundefined "See the
w.npmjs.com/package/lodash.isundefined "See the npm package") npm package") [&#x24C9;][1]
Checks if `value` is `undefined`. Checks if `value` is `undefined`.
#### Since
0.1.0
#### Arguments #### Arguments
1. `value` *(&#42;)*: The value to check. 1. `value` *(&#42;)*: The value to check.
#### Returns #### Returns
*(boolean)*: Returns `true` if `value` is `undefined`, else `false`. *(boolean)*: Returns `true` if `value` is `undefined`, else `false`.
#### Example #### Example
```js ```js
_.isUndefined(void 0); _.isUndefined(void 0);
// => true // => true
_.isUndefined(null); _.isUndefined(null);
// => false // => false
``` ```
* * * ---
<!-- /div -->
<!-- div -->
<h3 id="_isweakmapvalue"><code>_.isWeakMap(value)</code></h3>
[&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L12287 "View
in source") [&#x24C3;](https://www.npmjs.com/package/lodash.isweakmap "See the n
pm package") [&#x24C9;][1]
Checks if `value` is classified as a `WeakMap` object.
#### Since
4.3.0
#### Arguments
1. `value` *(&#42;)*: The value to check.
#### Returns
*(boolean)*: Returns `true` if `value` is a weak map, else `false`.
#### Example
```js
_.isWeakMap(new WeakMap);
// => true
_.isWeakMap(new Map);
// => false
```
---
<!-- /div -->
<!-- div -->
<h3 id="_isweaksetvalue"><code>_.isWeakSet(value)</code></h3>
[&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L12308 "View
in source") [&#x24C3;](https://www.npmjs.com/package/lodash.isweakset "See the n
pm package") [&#x24C9;][1]
Checks if `value` is classified as a `WeakSet` object.
#### Since
4.3.0
#### Arguments
1. `value` *(&#42;)*: The value to check.
#### Returns
*(boolean)*: Returns `true` if `value` is a weak set, else `false`.
#### Example
```js
_.isWeakSet(new WeakSet);
// => true
_.isWeakSet(new Set);
// => false
```
---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_ltvalue-other"></a>`_.lt(value, other)` <h3 id="_ltvalue-other"><code>_.lt(value, other)</code></h3>
<a href="#_ltvalue-other">#</a> [&#x24C8;](https://github.com/lodash/lodash/blob [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L12335 "View
/4.0.0/lodash.js#L10079 "View in source") [&#x24C9;][1] [&#x24C3;](https://www.n in source") [&#x24C3;](https://www.npmjs.com/package/lodash.lt "See the npm pack
pmjs.com/package/lodash.lt "See the npm package") age") [&#x24C9;][1]
Checks if `value` is less than `other`. Checks if `value` is less than `other`.
#### Since
3.9.0
#### Arguments #### Arguments
1. `value` *(&#42;)*: The value to compare. 1. `value` *(&#42;)*: The value to compare.
2. `other` *(&#42;)*: The other value to compare. 2. `other` *(&#42;)*: The other value to compare.
#### Returns #### Returns
*(boolean)*: Returns `true` if `value` is less than `other`, else `false`. *(boolean)*: Returns `true` if `value` is less than `other`, else `false`.
#### Example #### Example
```js ```js
_.lt(1, 3); _.lt(1, 3);
// => true // => true
_.lt(3, 3); _.lt(3, 3);
// => false // => false
_.lt(3, 1); _.lt(3, 1);
// => false // => false
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_ltevalue-other"></a>`_.lte(value, other)` <h3 id="_ltevalue-other"><code>_.lte(value, other)</code></h3>
<a href="#_ltevalue-other">#</a> [&#x24C8;](https://github.com/lodash/lodash/blo [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L12360 "View
b/4.0.0/lodash.js#L10103 "View in source") [&#x24C9;][1] [&#x24C3;](https://www. in source") [&#x24C3;](https://www.npmjs.com/package/lodash.lte "See the npm pac
npmjs.com/package/lodash.lte "See the npm package") kage") [&#x24C9;][1]
Checks if `value` is less than or equal to `other`. Checks if `value` is less than or equal to `other`.
#### Since
3.9.0
#### Arguments #### Arguments
1. `value` *(&#42;)*: The value to compare. 1. `value` *(&#42;)*: The value to compare.
2. `other` *(&#42;)*: The other value to compare. 2. `other` *(&#42;)*: The other value to compare.
#### Returns #### Returns
*(boolean)*: Returns `true` if `value` is less than or equal to `other`, else ` false`. *(boolean)*: Returns `true` if `value` is less than or equal to `other`, else `f alse`.
#### Example #### Example
```js ```js
_.lte(1, 3); _.lte(1, 3);
// => true // => true
_.lte(3, 3); _.lte(3, 3);
// => true // => true
_.lte(3, 1); _.lte(3, 1);
// => false // => false
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_toarrayvalue"></a>`_.toArray(value)` <h3 id="_toarrayvalue"><code>_.toArray(value)</code></h3>
<a href="#_toarrayvalue">#</a> [&#x24C8;](https://github.com/lodash/lodash/blob/ [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L12387 "View
4.0.0/lodash.js#L10129 "View in source") [&#x24C9;][1] [&#x24C3;](https://www.np in source") [&#x24C3;](https://www.npmjs.com/package/lodash.toarray "See the npm
mjs.com/package/lodash.toarray "See the npm package") package") [&#x24C9;][1]
Converts `value` to an array. Converts `value` to an array.
#### Since
0.1.0
#### Arguments #### Arguments
1. `value` *(&#42;)*: The value to convert. 1. `value` *(&#42;)*: The value to convert.
#### Returns #### Returns
*(Array)*: Returns the converted array. *(Array)*: Returns the converted array.
#### Example #### Example
```js ```js
_.toArray({ 'a': 1, 'b': 2 }); _.toArray({ 'a': 1, 'b': 2 });
// => [1, 2] // => [1, 2]
_.toArray('abc'); _.toArray('abc');
// => ['a', 'b', 'c'] // => ['a', 'b', 'c']
_.toArray(1); _.toArray(1);
// => [] // => []
_.toArray(null); _.toArray(null);
// => [] // => []
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_tointegervalue"></a>`_.toInteger(value)` <h3 id="_tofinitevalue"><code>_.toFinite(value)</code></h3>
<a href="#_tointegervalue">#</a> [&#x24C8;](https://github.com/lodash/lodash/blo [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L12426 "View
b/4.0.0/lodash.js#L10169 "View in source") [&#x24C9;][1] [&#x24C3;](https://www. in source") [&#x24C3;](https://www.npmjs.com/package/lodash.tofinite "See the np
npmjs.com/package/lodash.tointeger "See the npm package") m package") [&#x24C9;][1]
Converts `value` to a finite number.
#### Since
4.12.0
#### Arguments
1. `value` *(&#42;)*: The value to convert.
#### Returns
*(number)*: Returns the converted number.
#### Example
```js
_.toFinite(3.2);
// => 3.2
_.toFinite(Number.MIN_VALUE);
// => 5e-324
_.toFinite(Infinity);
// => 1.7976931348623157e+308
_.toFinite('3.2');
// => 3.2
```
---
<!-- /div -->
<!-- div -->
<h3 id="_tointegervalue"><code>_.toInteger(value)</code></h3>
[&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L12464 "View
in source") [&#x24C3;](https://www.npmjs.com/package/lodash.tointeger "See the n
pm package") [&#x24C9;][1]
Converts `value` to an integer. Converts `value` to an integer.
<br> <br>
<br> <br>
**Note:** This function is loosely based on [`ToInteger`](http://www.ecma-intern **Note:** This method is loosely based on
ational.org/ecma-262/6.0/#sec-tointeger). [`ToInteger`](http://www.ecma-international.org/ecma-262/7.0/#sec-tointeger).
#### Since
4.0.0
#### Arguments #### Arguments
1. `value` *(&#42;)*: The value to convert. 1. `value` *(&#42;)*: The value to convert.
#### Returns #### Returns
*(number)*: Returns the converted integer. *(number)*: Returns the converted integer.
#### Example #### Example
```js ```js
_.toInteger(3); _.toInteger(3.2);
// => 3 // => 3
_.toInteger(Number.MIN_VALUE); _.toInteger(Number.MIN_VALUE);
// => 0 // => 0
_.toInteger(Infinity); _.toInteger(Infinity);
// => 1.7976931348623157e+308 // => 1.7976931348623157e+308
_.toInteger('3'); _.toInteger('3.2');
// => 3 // => 3
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_tolengthvalue"></a>`_.toLength(value)` <h3 id="_tolengthvalue"><code>_.toLength(value)</code></h3>
<a href="#_tolengthvalue">#</a> [&#x24C8;](https://github.com/lodash/lodash/blob [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L12498 "View
/4.0.0/lodash.js#L10207 "View in source") [&#x24C9;][1] [&#x24C3;](https://www.n in source") [&#x24C3;](https://www.npmjs.com/package/lodash.tolength "See the np
pmjs.com/package/lodash.tolength "See the npm package") m package") [&#x24C9;][1]
Converts `value` to an integer suitable for use as the length of an Converts `value` to an integer suitable for use as the length of an
array-like object. array-like object.
<br> <br>
<br> <br>
**Note:** This method is based on [`ToLength`](http://ecma-international.org/ecm **Note:** This method is based on
a-262/6.0/#sec-tolength). [`ToLength`](http://ecma-international.org/ecma-262/7.0/#sec-tolength).
#### Since
4.0.0
#### Arguments #### Arguments
1. `value` *(&#42;)*: The value to convert. 1. `value` *(&#42;)*: The value to convert.
#### Returns
*(number)*: Returns the converted integer.
#### Example #### Example
```js ```js
_.toLength(3); _.toLength(3.2);
// => 3 // => 3
_.toLength(Number.MIN_VALUE); _.toLength(Number.MIN_VALUE);
// => 0 // => 0
_.toLength(Infinity); _.toLength(Infinity);
// => 4294967295 // => 4294967295
_.toLength('3'); _.toLength('3.2');
// => 3 // => 3
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_tonumbervalue"></a>`_.toNumber(value)` <h3 id="_tonumbervalue"><code>_.toNumber(value)</code></h3>
<a href="#_tonumbervalue">#</a> [&#x24C8;](https://github.com/lodash/lodash/blob [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L12525 "View
/4.0.0/lodash.js#L10233 "View in source") [&#x24C9;][1] [&#x24C3;](https://www.n in source") [&#x24C3;](https://www.npmjs.com/package/lodash.tonumber "See the np
pmjs.com/package/lodash.tonumber "See the npm package") m package") [&#x24C9;][1]
Converts `value` to a number. Converts `value` to a number.
#### Since
4.0.0
#### Arguments #### Arguments
1. `value` *(&#42;)*: The value to process. 1. `value` *(&#42;)*: The value to process.
#### Returns #### Returns
*(number)*: Returns the number. *(number)*: Returns the number.
#### Example #### Example
```js ```js
_.toNumber(3); _.toNumber(3.2);
// => 3 // => 3.2
_.toNumber(Number.MIN_VALUE); _.toNumber(Number.MIN_VALUE);
// => 5e-324 // => 5e-324
_.toNumber(Infinity); _.toNumber(Infinity);
// => Infinity // => Infinity
_.toNumber('3'); _.toNumber('3.2');
// => 3 // => 3.2
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_toplainobjectvalue"></a>`_.toPlainObject(value)` <h3 id="_toplainobjectvalue"><code>_.toPlainObject(value)</code></h3>
<a href="#_toplainobjectvalue">#</a> [&#x24C8;](https://github.com/lodash/lodash [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L12570 "View
/blob/4.0.0/lodash.js#L10271 "View in source") [&#x24C9;][1] [&#x24C3;](https:// in source") [&#x24C3;](https://www.npmjs.com/package/lodash.toplainobject "See t
www.npmjs.com/package/lodash.toplainobject "See the npm package") he npm package") [&#x24C9;][1]
Converts `value` to a plain object flattening inherited enumerable Converts `value` to a plain object flattening inherited enumerable string
properties of `value` to own properties of the plain object. keyed properties of `value` to own properties of the plain object.
#### Since
3.0.0
#### Arguments #### Arguments
1. `value` *(&#42;)*: The value to convert. 1. `value` *(&#42;)*: The value to convert.
#### Returns #### Returns
*(Object)*: Returns the converted plain object. *(Object)*: Returns the converted plain object.
#### Example #### Example
```js ```js
function Foo() { function Foo() {
this.b = 2; this.b = 2;
} }
Foo.prototype.c = 3; Foo.prototype.c = 3;
_.assign({ 'a': 1 }, new Foo); _.assign({ 'a': 1 }, new Foo);
// => { 'a': 1, 'b': 2 } // => { 'a': 1, 'b': 2 }
_.assign({ 'a': 1 }, _.toPlainObject(new Foo)); _.assign({ 'a': 1 }, _.toPlainObject(new Foo));
// => { 'a': 1, 'b': 2, 'c': 3 } // => { 'a': 1, 'b': 2, 'c': 3 }
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_tosafeintegervalue"></a>`_.toSafeInteger(value)` <h3 id="_tosafeintegervalue"><code>_.toSafeInteger(value)</code></h3>
<a href="#_tosafeintegervalue">#</a> [&#x24C8;](https://github.com/lodash/lodash [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L12598 "View
/blob/4.0.0/lodash.js#L10298 "View in source") [&#x24C9;][1] [&#x24C3;](https:// in source") [&#x24C3;](https://www.npmjs.com/package/lodash.tosafeinteger "See t
www.npmjs.com/package/lodash.tosafeinteger "See the npm package") he npm package") [&#x24C9;][1]
Converts `value` to a safe integer. A safe integer can be compared and Converts `value` to a safe integer. A safe integer can be compared and
represented correctly. represented correctly.
#### Since
4.0.0
#### Arguments #### Arguments
1. `value` *(&#42;)*: The value to convert. 1. `value` *(&#42;)*: The value to convert.
#### Returns #### Returns
*(number)*: Returns the converted integer. *(number)*: Returns the converted integer.
#### Example #### Example
```js ```js
_.toSafeInteger(3); _.toSafeInteger(3.2);
// => 3 // => 3
_.toSafeInteger(Number.MIN_VALUE); _.toSafeInteger(Number.MIN_VALUE);
// => 0 // => 0
_.toSafeInteger(Infinity); _.toSafeInteger(Infinity);
// => 9007199254740991 // => 9007199254740991
_.toSafeInteger('3'); _.toSafeInteger('3.2');
// => 3 // => 3
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_tostringvalue"></a>`_.toString(value)` <h3 id="_tostringvalue"><code>_.toString(value)</code></h3>
<a href="#_tostringvalue">#</a> [&#x24C8;](https://github.com/lodash/lodash/blob [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L12625 "View
/4.0.0/lodash.js#L10322 "View in source") [&#x24C9;][1] [&#x24C3;](https://www.n in source") [&#x24C3;](https://www.npmjs.com/package/lodash.tostring "See the np
pmjs.com/package/lodash.tostring "See the npm package") m package") [&#x24C9;][1]
Converts `value` to a string if it's not one. An empty string is returned Converts `value` to a string. An empty string is returned for `null`
for `null` and `undefined` values. The sign of `-0` is preserved. and `undefined` values. The sign of `-0` is preserved.
#### Since
4.0.0
#### Arguments #### Arguments
1. `value` *(&#42;)*: The value to process. 1. `value` *(&#42;)*: The value to convert.
#### Returns #### Returns
*(string)*: Returns the string. *(string)*: Returns the converted string.
#### Example #### Example
```js ```js
_.toString(null); _.toString(null);
// => '' // => ''
_.toString(-0); _.toString(-0);
// => '-0' // => '-0'
_.toString([1, 2, 3]); _.toString([1, 2, 3]);
// => '1,2,3' // => '1,2,3'
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
## `“Math” Methods` ## `“Math” Methods`
<!-- div --> <!-- div -->
### <a id="_addaugend-addend"></a>`_.add(augend, addend)` <h3 id="_addaugend-addend"><code>_.add(augend, addend)</code></h3>
<a href="#_addaugend-addend">#</a> [&#x24C8;](https://github.com/lodash/lodash/b [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L16289 "View
lob/4.0.0/lodash.js#L13547 "View in source") [&#x24C9;][1] [&#x24C3;](https://ww in source") [&#x24C3;](https://www.npmjs.com/package/lodash.add "See the npm pac
w.npmjs.com/package/lodash.add "See the npm package") kage") [&#x24C9;][1]
Adds two numbers. Adds two numbers.
#### Since
3.4.0
#### Arguments #### Arguments
1. `augend` *(number)*: The first number in an addition. 1. `augend` *(number)*: The first number in an addition.
2. `addend` *(number)*: The second number in an addition. 2. `addend` *(number)*: The second number in an addition.
#### Returns #### Returns
*(number)*: Returns the total. *(number)*: Returns the total.
#### Example #### Example
```js ```js
_.add(6, 4); _.add(6, 4);
// => 10 // => 10
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_ceilnumber-precision0"></a>`_.ceil(number, [precision=0])` <h3 id="_ceilnumber-precision0"><code>_.ceil(number, [precision=0])</code></h3>
<a href="#_ceilnumber-precision0">#</a> [&#x24C8;](https://github.com/lodash/lod [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L16314 "View
ash/blob/4.0.0/lodash.js#L13578 "View in source") [&#x24C9;][1] [&#x24C3;](https in source") [&#x24C3;](https://www.npmjs.com/package/lodash.ceil "See the npm pa
://www.npmjs.com/package/lodash.ceil "See the npm package") ckage") [&#x24C9;][1]
Computes `number` rounded up to `precision`. Computes `number` rounded up to `precision`.
#### Since
3.10.0
#### Arguments #### Arguments
1. `number` *(number)*: The number to round up. 1. `number` *(number)*: The number to round up.
2. `[precision=0]` *(number)*: The precision to round up to. 2. `[precision=0]` *(number)*: The precision to round up to.
#### Returns #### Returns
*(number)*: Returns the rounded up number. *(number)*: Returns the rounded up number.
#### Example #### Example
```js ```js
_.ceil(4.006); _.ceil(4.006);
// => 5 // => 5
_.ceil(6.004, 2); _.ceil(6.004, 2);
// => 6.01 // => 6.01
_.ceil(6040, -2); _.ceil(6040, -2);
// => 6100 // => 6100
``` ```
* * * ---
<!-- /div -->
<!-- div -->
<h3 id="_dividedividend-divisor"><code>_.divide(dividend, divisor)</code></h3>
[&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L16331 "View
in source") [&#x24C3;](https://www.npmjs.com/package/lodash.divide "See the npm
package") [&#x24C9;][1]
Divide two numbers.
#### Since
4.7.0
#### Arguments
1. `dividend` *(number)*: The first number in a division.
2. `divisor` *(number)*: The second number in a division.
#### Returns
*(number)*: Returns the quotient.
#### Example
```js
_.divide(6, 4);
// => 1.5
```
---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_floornumber-precision0"></a>`_.floor(number, [precision=0])` <h3 id="_floornumber-precision0"><code>_.floor(number, [precision=0])</code></h3
<a href="#_floornumber-precision0">#</a> [&#x24C8;](https://github.com/lodash/lo >
dash/blob/4.0.0/lodash.js#L13600 "View in source") [&#x24C9;][1] [&#x24C3;](http [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L16356 "View
s://www.npmjs.com/package/lodash.floor "See the npm package") in source") [&#x24C3;](https://www.npmjs.com/package/lodash.floor "See the npm p
ackage") [&#x24C9;][1]
Computes `number` rounded down to `precision`. Computes `number` rounded down to `precision`.
#### Since
3.10.0
#### Arguments #### Arguments
1. `number` *(number)*: The number to round down. 1. `number` *(number)*: The number to round down.
2. `[precision=0]` *(number)*: The precision to round down to. 2. `[precision=0]` *(number)*: The precision to round down to.
#### Returns #### Returns
*(number)*: Returns the rounded down number. *(number)*: Returns the rounded down number.
#### Example #### Example
```js ```js
_.floor(4.006); _.floor(4.006);
// => 4 // => 4
_.floor(0.046, 2); _.floor(0.046, 2);
// => 0.04 // => 0.04
_.floor(4060, -2); _.floor(4060, -2);
// => 4000 // => 4000
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_maxarray"></a>`_.max(array)` <h3 id="_maxarray"><code>_.max(array)</code></h3>
<a href="#_maxarray">#</a> [&#x24C8;](https://github.com/lodash/lodash/blob/4.0. [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L16376 "View
0/lodash.js#L13619 "View in source") [&#x24C9;][1] [&#x24C3;](https://www.npmjs. in source") [&#x24C3;](https://www.npmjs.com/package/lodash.max "See the npm pac
com/package/lodash.max "See the npm package") kage") [&#x24C9;][1]
Computes the maximum value of `array`. If `array` is empty or falsey Computes the maximum value of `array`. If `array` is empty or falsey,
`undefined` is returned. `undefined` is returned.
#### Since
0.1.0
#### Arguments #### Arguments
1. `array` *(Array)*: The array to iterate over. 1. `array` *(Array)*: The array to iterate over.
#### Returns #### Returns
*(&#42;)*: Returns the maximum value. *(&#42;)*: Returns the maximum value.
#### Example #### Example
```js ```js
_.max([4, 2, 8, 6]); _.max([4, 2, 8, 6]);
// => 8 // => 8
_.max([]); _.max([]);
// => undefined // => undefined
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_maxbyarray-iteratee_identity"></a>`_.maxBy(array, [iteratee=_.identi <h3 id="_maxbyarray-iteratee_identity"><code>_.maxBy(array, [iteratee=_.identity
ty])` ])</code></h3>
<a href="#_maxbyarray-iteratee_identity">#</a> [&#x24C8;](https://github.com/lod [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L16405 "View
ash/lodash/blob/4.0.0/lodash.js#L13647 "View in source") [&#x24C9;][1] [&#x24C3; in source") [&#x24C3;](https://www.npmjs.com/package/lodash.maxby "See the npm p
](https://www.npmjs.com/package/lodash.maxby "See the npm package") ackage") [&#x24C9;][1]
This method is like `_.max` except that it accepts `iteratee` which is This method is like `_.max` except that it accepts `iteratee` which is
invoked for each element in `array` to generate the criterion by which invoked for each element in `array` to generate the criterion by which
the value is ranked. The iteratee is invoked with one argument: (value). the value is ranked. The iteratee is invoked with one argument: *(value)*.
#### Since
4.0.0
#### Arguments #### Arguments
1. `array` *(Array)*: The array to iterate over. 1. `array` *(Array)*: The array to iterate over.
2. `[iteratee=_.identity]` *(Function|Object|string)*: The iteratee invoked per element. 2. `[iteratee=_.identity]` *(Function)*: The iteratee invoked per element.
#### Returns #### Returns
*(&#42;)*: Returns the maximum value. *(&#42;)*: Returns the maximum value.
#### Example #### Example
```js ```js
var objects = [{ 'n': 1 }, { 'n': 2 }]; var objects = [{ 'n': 1 }, { 'n': 2 }];
_.maxBy(objects, function(o) { return o.a; }); _.maxBy(objects, function(o) { return o.n; });
// => { 'n': 2 } // => { 'n': 2 }
// using the `_.property` iteratee shorthand // The `_.property` iteratee shorthand.
_.maxBy(objects, 'n'); _.maxBy(objects, 'n');
// => { 'n': 2 } // => { 'n': 2 }
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_meanarray"></a>`_.mean(array)` <h3 id="_meanarray"><code>_.mean(array)</code></h3>
<a href="#_meanarray">#</a> [&#x24C8;](https://github.com/lodash/lodash/blob/4.0 [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L16425 "View
.0/lodash.js#L13666 "View in source") [&#x24C9;][1] [&#x24C3;](https://www.npmjs in source") [&#x24C3;](https://www.npmjs.com/package/lodash.mean "See the npm pa
.com/package/lodash.mean "See the npm package") ckage") [&#x24C9;][1]
Computes the mean of the values in `array`. Computes the mean of the values in `array`.
#### Since
4.0.0
#### Arguments #### Arguments
1. `array` *(Array)*: The array to iterate over. 1. `array` *(Array)*: The array to iterate over.
#### Returns #### Returns
*(number)*: Returns the mean. *(number)*: Returns the mean.
#### Example #### Example
```js ```js
_.mean([4, 2, 8, 6]); _.mean([4, 2, 8, 6]);
// => 5 // => 5
``` ```
* * * ---
<!-- /div -->
<!-- div -->
<h3 id="_meanbyarray-iteratee_identity"><code>_.meanBy(array, [iteratee=_.identi
ty])</code></h3>
[&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L16452 "View
in source") [&#x24C3;](https://www.npmjs.com/package/lodash.meanby "See the npm
package") [&#x24C9;][1]
This method is like `_.mean` except that it accepts `iteratee` which is
invoked for each element in `array` to generate the value to be averaged.
The iteratee is invoked with one argument: *(value)*.
#### Since
4.7.0
#### Arguments
1. `array` *(Array)*: The array to iterate over.
2. `[iteratee=_.identity]` *(Function)*: The iteratee invoked per element.
#### Returns
*(number)*: Returns the mean.
#### Example
```js
var objects = [{ 'n': 4 }, { 'n': 2 }, { 'n': 8 }, { 'n': 6 }];
_.meanBy(objects, function(o) { return o.n; });
// => 5
// The `_.property` iteratee shorthand.
_.meanBy(objects, 'n');
// => 5
```
---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_minarray"></a>`_.min(array)` <h3 id="_minarray"><code>_.min(array)</code></h3>
<a href="#_minarray">#</a> [&#x24C8;](https://github.com/lodash/lodash/blob/4.0. [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L16474 "View
0/lodash.js#L13687 "View in source") [&#x24C9;][1] [&#x24C3;](https://www.npmjs. in source") [&#x24C3;](https://www.npmjs.com/package/lodash.min "See the npm pac
com/package/lodash.min "See the npm package") kage") [&#x24C9;][1]
Computes the minimum value of `array`. If `array` is empty or falsey Computes the minimum value of `array`. If `array` is empty or falsey,
`undefined` is returned. `undefined` is returned.
#### Since
0.1.0
#### Arguments #### Arguments
1. `array` *(Array)*: The array to iterate over. 1. `array` *(Array)*: The array to iterate over.
#### Returns #### Returns
*(&#42;)*: Returns the minimum value. *(&#42;)*: Returns the minimum value.
#### Example #### Example
```js ```js
_.min([4, 2, 8, 6]); _.min([4, 2, 8, 6]);
// => 2 // => 2
_.min([]); _.min([]);
// => undefined // => undefined
``` ```
* * * ---
<!-- /div --> <!-- /div -->
<!-- div --> <!-- div -->
### <a id="_minbyarray-iteratee_identity"></a>`_.minBy(array, [iteratee=_.identi <h3 id="_minbyarray-iteratee_identity"><code>_.minBy(array, [iteratee=_.identity
ty])` ])</code></h3>
<a href="#_minbyarray-iteratee_identity">#</a> [&#x24C8;](https://github.com/lod [&#x24C8;](https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L16503 "View
ash/lodash/blob/4.0.0/lodash.js#L13715 "View in source") [&#x24C9;][1] [&#x24C3; in source") [&