code: function(isKey) {
          var arr = [],
              key,
              map = this.map;
          for (key in map) {
              if (map.hasOwnProperty(key)) {
                  arr.push(isKey ? key: map[key]);
              }
          }
          return arr;
      }
docs: Gets either the keys/values in an array from the hash.
  @private
  @param {Boolean} isKey True to extract the keys, otherwise, the value
  @return {Array} An array of either keys/values from the hash.