Quick script to shuffle a deck of cards. More specifically, to hand back cards from a deck one at a time in random order.

cards.js

var cltnc = (function() {
  return {
    CardDeck: function(ary) {
      if ("string" == typeof(ary)) {
        this.ary = ary.split("");
      } else {
        this.ary = ary;
      }
      this.remaining = ary.length;

      this.nextCard = function() {
        if (this.remaining <= 0) {
          throw new RangeError('All the cards have been dealt');
        }

        // Take a random card out of all
        // available, then move this card to the end
        var idx = Math.floor(Math.random() * this.remaining);
        var ret = this.ary[idx];
        this.ary[idx] = this.ary[this.remaining - 1];
        this.ary[this.remaining - 1] = ret;
        this.remaining--;
        return ret;
      };
    }
  };
}());