deck-shuffle.js

/*
 * Fisher-Yates algorithm from Knuth TAOCP Vol. 2 Sec 3.4.2
 */
this.shuffle = function () {
    var j = 52;
    while (--j) {
        var n = Math.random();
        var k = Math.floor(j * n) + 1;
        var temp = this.cards[j];
        this.cards[j] = this.cards[k];
        this.cards[k] = temp;
    }
};