shuffleDeck.js

var deepCopy = require("deepcopy");
//takes in deck object, returns shuffled deck object, given random number generator
function size (object) {
  var size = 0;
  var keys = Object.keys(object);
  for (var i = 0; i<keys.length; i++){
    if(object.hasOwnProperty(keys[i])){
       size++;
    }
  }
  return size;
}

var deck = function (deck) {
  var originalDeck = deepCopy(deck);
  var destroyedDeck = deepCopy(deck);
  //console.log(destroyedDeck);
  //console.log(originalDeck);
  //console.log(size(originalDeck));
  //console.log(size(destroyedDeck));
  var shuffled = {};
  var i = 0;
  shuffleDeck = function (){
    if(size(shuffled) == size(originalDeck)){
      //console.log(shuffled);
      var newShuffle = deepCopy(shuffled);
      //console.log(newShuffle);
      return newShuffle;
    }

    else{
      var keys = Object.keys(destroyedDeck);
      var random = Math.floor(Math.random()*keys.length);
      //console.log(i);
      //console.log(typeof(destroyedDeck));
      //console.log(keys);
      //console.log(random);
      //console.log(keys[random])
      shuffled[i+1] = destroyedDeck[keys[random]];
      //console.log(shuffled);
      i++;
      delete destroyedDeck[keys[random]];
      return shuffleDeck(destroyedDeck);
    }
  }
  this.shuffle = function (){
    return shuffleDeck();
  }
};

var deckObj = {1 : "a",
2: "b",
3: "c",
4: "d",
5: "f",
6: "g"
};

//console.log(Object.getOwnPropertyNames(deckObj))
var deck = new deck(deckObj);
var newdeck = deck.shuffle();
console.log(newdeck);