util.js revision a36e5920737c6adbddd3e43b760e5de8431db6e0 
1// Copyright 2013 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5/**
6 * @fileoverview Some utility functions that don't belong anywhere else in the
7 * code.
8 */
9
10var util = (function() {
11  var util = {};
12  util.object = {};
13  /**
14   * Calls a function for each element in an object/map/hash.
15   *
16   * @param obj The object to iterate over.
17   * @param f The function to call on every value in the object.  F should have
18   * the following arguments: f(value, key, object) where value is the value
19   * of the property, key is the corresponding key, and obj is the object that
20   * was passed in originally.
21   * @param optObj The object use as 'this' within f.
22   */
23  util.object.forEach = function(obj, f, optObj) {
24    'use strict';
25    var key;
26    for (key in obj) {
27      if (obj.hasOwnProperty(key)) {
28        f.call(optObj, obj[key], key, obj);
29      }
30    }
31  };
32
33  return util;
34}());
35