luhn-alg

luhn.js
=======

  

> Fastest JavaScript implementation of the Luhn algorithm.

Benchmarks here.

This algorithm (also known as Luhn formula) is useful to validate a variety of identification numbers (e.g. credit card numbers).

$3

~1KB.

UMD builds for development - index.js and index.js.map - and production - index.min.js - available.

So it's installable both on node and/or for browsers.

``
$ npm install luhn-alg
$ bower install luhn-alg
`

Usage
-----

Simplest API ever.

`
luhn(x: number): boolean
`

$3

Try it in node.

`
$ > var luhn = require('luhn-alg');
$ > luhn('4242424242424242');
$ true
``

$3

Include the UMD build (e.g., index.min.js) and you'll have a luhn function on the window/global scope.

Or use CommonJS, AMD, WTFYW etc.

Tests
-----

This project is fully unit tested on:

* node.js 0.10, node.js 0.12, io.js
* about 50 browser versions

Credits
-------

- ShirtlessKirk's popular gist
- Anyone contributing and improving performances

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