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extsprintf

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extsprintf

extended POSIX-style sprintf

    1.4.1latest

Version published
Maintainers
14
Weekly downloads
29,063,426
decreased by-1.45%

Weekly downloads

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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 of this.

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 Javascript has no notion of the physical size of an argument.

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

Example

First, install it:

# npm install extsprintf

Now, use it:

var mod_extsprintf = require('extsprintf'); console.log(mod_extsprintf.sprintf('hello %25s', 'world'));

outputs:

hello world

Also supported

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.

FAQs

What is extsprintf?

extended POSIX-style sprintf

Is extsprintf popular?

The npm package extsprintf receives a total of 27,539,437 weekly downloads. As such, extsprintf popularity was classified as popular.

Is extsprintf well maintained?

We found that extsprintf demonstrated a healthy version release cadence and project activity. It has 14 open source maintainers collaborating on the project.

Last updated on 02 Nov 2021
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