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extsprintf: extended POSIX-style sprintf
Stripped down version of s[n]printf(3c). We make a best effort to throw an
exception when given a format string we don’t understand, rather than ignoring
it, so that we won’t break existing programs if/when we go implement the rest
This implementation currently supports specifying
- field alignment (‘-’ flag),
- zero-pad (‘0’ flag)
- always show numeric sign (‘+’ flag),
- field width
- conversions for strings, decimal integers, and floats (numbers).
- argument size specifiers. These are all accepted but ignored, since
Everything else is currently unsupported, most notably: precision, unsigned
numbers, non-decimal numbers, and characters.
Besides the usual POSIX conversions, this implementation supports:
%j: pretty-print a JSON object (using node’s “inspect”)
%r: pretty-print an Error object
First, install it:
# npm install extsprintf
Now, use it:
var mod_extsprintf = require('extsprintf');
console.log(mod_extsprintf.sprintf('hello %25s', 'world'));