Shuffle algorithm for JavaScript

shuffle.js

// Randomly shuffles an array in-place using Fisher-Yates algorithm
// http://stackoverflow.com/a/12646864
Array.prototype.shuffle = function() {
  for (var i = this.length - 1; i > 0; i--) {
    var j = Math.floor(Math.random() * (i + 1));
    var temp = this[i];
    this[i] = this[j];
    this[j] = temp;
  }
  return this;
};