_.uniq = function(array, isSorted, iterator) {
    var uniqueArray = [];
    var storeObj = {};
    var iteratorArray = [];

    _.each(array, function(item, index) {
      if (iterator) {
        iteratorArray.push(iterator(item));
      } else {
        iteratorArray.push(_.identity(item));
      }
    });

    _.each(iteratorArray, function(item, index) {
      if (storeObj[item] === undefined) {
        storeObj[item] = array[index];
      }
    });

    for(var key in storeObj) {
      uniqueArray.push(storeObj[key]);
    }

    return uniqueArray;
  };