Simple card shuffler

shuffle.js

function Card(face, suit) {
  this.face = face;
  this.suit = suit;

  // Cheap to_string function
  this.to_s = function() {
    return "The " + face + " of " + suit;
  }
}

// Set up the suits and face values for the cards.
suits = ["Diamonds", "Clubs", "Hearts", "Spades"]
faces = ["Two", "Three", "Four", "Five", "Six", "Seven", "Eight", "Nine", "Ten", "Jack", "Queen", "King", "Ace"]

// allCards contains a list of objects. Each object should be a sorted list of cards, and a shuffled state (true/false)
var allCards = [];

/* Function newDeck
 *   Adds a new pack of 52 cards to the end of the deck
 *
 * params: shuffled boolean
 *   Is the new deck shuffled or not? 
 */
function newDeck(shuffled) {
  deck = [];
  for (var s = 0; s < suits.length; s++) {
    for (var f = 0; f < faces.length; f++) {
      deck.push(new Card(faces[f], suits[s]));
    }
  }

  allCards.push({cards: deck, shuffled: (shuffled == true)});
}

/* Function draw(x)
 *  Draws the top x cards from allCards to the caller
 *
 * params: x int
 *  number of cards to draw
 *
 * returns: [Card]
 *  a list of cards - may be less than requested, depending on the number available in allCards
 */
function draw(x) {
  var toRet = [];

  for (var d = 0; d < x; d++) {
    if (allCards.length == 0) {
      // Out of cards.
      return toRet;
    } else if (allCards[0].cards.length == 0) {
      // This set is empty, move onto the next...
      // What I wouldn't give for an lpop...
      allCards.splice(0, 1);
      d--;
    } else {
      // Actually draw a card - if we're shuffled, use a lazy evaluation of the Fisher-Yates algorithm
      if (allCards[0].shuffled) {
        toRet.push(allCards[0].cards.splice(parseInt(Math.random() * allCards[0].cards.length), 1)[0]);
      } else {
        toRet.push(allCards[0].cards.splice(0, 1)[0]);
      }
    }
  }
  return toRet;
}

// No actual shuffling happens here - just flatten allCards into a single element
// and deal with it later
function shuffle() {
  flatten = [];
  while (allCards.length > 0) {
    d = allCards.pop();
    flatten = flatten.concat(d.cards);
  }

  allCards.push({cards: flatten, shuffled: true});
}