frankly-js/frankly/utility/collection/forEach.js

JavaScript library providing building blocks to write applications using the Frankly API.

/*
 * The MIT License (MIT)
 *
 * Copyright (c) 2015 Frankly Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
'use strict'

var hasOwn = Object.prototype.hasOwnProperty
var toString = Object.prototype.toString

function forEach (obj, fn, ctx) {
  var i = undefined

  if (toString.call(fn) !== '[object Function]') {
    throw new TypeError('iterator must be a function')
  }

  if (Array.isArray(obj) || typeof obj === 'string') {
    for (i = 0; i < obj.length; i++) {
      fn.call(ctx, obj[i], i, obj)
    }
  } else {
    for (i in obj) {
      if (hasOwn.call(obj, i)) {
        fn.call(ctx, obj[i], i, obj)
      }
    }
  }
}

module.exports = forEach