retrieve method for hash table value retrieval in Javascript

retrieve hashtable value

HashTable.prototype.retrieve = function(key) {
  var index = key.hashCode();
  var bucket = this._storage.get(index);
  for (var i = 0; i < bucket.length; i++) {
    if (bucket[i][0] === key) {
      return bucket[i][1];
    }   
  }
};