001.html

<script src="flat_map.js"></script>
<script src="shuffle.js"></script>
<script src="card.js"></script>
<script src="deck.js"></script>

card.js

var Card = function(rank, suit) {
  var self  = this;
  self.rank = rank;
  self.suit = suit;

  var toString = function() {
    return self.rank + " of " + self.suit;
  }

  return {
    name: toString(),
    suit: suit,
    rank: rank
  }
};

deck.js

var Deck = function() {
  var self = this;
  var cards = [];
  var SUITS = ['Diamonds', 'Clubs', 'Hearts', 'Spades'];
  var RANKS = ['Ace',  'Two',  'Three', 'Four', 'Five',
               'Six',  'Seven', 'Eight', 'Nine', 
               'Ten',  'Jack', 'Queen', 'King'];

  var buildDeck = function() {
    var cards = SUITS.flatMap(function(suit, i) {
      return RANKS.map(function(rank, i) {
        return new Card(rank, suit);
      });
    });
    return cards.shuffle();
  }

  return {
    cards: buildDeck(),
  }
};

flat_map.js

// I want a flat map!
Array.prototype.flatMap = function(f) { 
  return Array.prototype.concat.apply([], this.map(f)); 
}

shuffle.js

// Fischer/Yates
Array.prototype.shuffle = function() {
  var self = this;
  var m = self.length, t, i;
  while (m) {
    i = Math.floor(Math.random() * m--);
    t = self[m];
    self[m] = self[i];
    self[i] = t;
  }

  return self;
}