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knuth-shuffle

1.0.8 • Public • Published

knuth-shuffle

The Fisher-Yates (aka Knuth) shuffle for Browser and Node.js

'nuf said.

The Fisher-Yates (Knuth) Shuffle

As Microsoft learned the hard way (see article below), function random() { return 0.5 - Math.random() } turns out to be no-so-random at all.

The fisher-yates shuffle is an algorithm so simple that even IEEE floating point math can't screw it up!

I put this on npm as knuth-shuffle because fisher-yates-shuffle was just too long of a name and shuffle was already taken.

Browser Example

<script src="https://raw.github.com/coolaj86/knuth-shuffle/master/index.js"></script>
(function () {
  'use strict';
 
  var a = [2,11,37,42];
  var b;
 
  // The shuffle modifies the original array
  // calling a.slice(0) creates a copy, which is assigned to b
  b = window.knuthShuffle(a.slice(0));
  console.log(b);
}());

Node Example

Decentralized Install

npm install --save git+https://git.coolaj86.com/coolaj86/knuth-shuffle.js.git#v1.0

Centralized Install

npm install --save knuth-shuffle@1.0
(function () {
  'use strict';
 
  var shuffle = require('knuth-shuffle').knuthShuffle;
  var a = [2,11,37,42];
  var b;
 
  // The shuffle modifies the original array
  // calling a.slice(0) creates a copy, which is assigned to b
  b = shuffle(a.slice(0));
  console.log(b);
}());

install

npm i knuth-shuffle

Downloadsweekly downloads

7,659

version

1.0.8

license

(MIT OR Apache-2.0)

repository

Gitgit

last publish

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