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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 of this.
This implementation currently supports specifying
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 objectFirst, install it:
# npm install extsprintf
Now, use it:
var mod_extsprintf = require('extsprintf');
console.log(mod_extsprintf.sprintf('hello %25s', 'world'));
outputs:
hello world
printf: same args as sprintf, but prints the result to stdout
fprintf: same args as sprintf, preceded by a Node stream. Prints the result to the given stream.