63 lines
1.7 KiB
JavaScript
63 lines
1.7 KiB
JavaScript
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'use strict';
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var isCallable = require('is-callable');
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var toStr = Object.prototype.toString;
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var hasOwnProperty = Object.prototype.hasOwnProperty;
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var forEachArray = function forEachArray(array, iterator, receiver) {
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for (var i = 0, len = array.length; i < len; i++) {
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if (hasOwnProperty.call(array, i)) {
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if (receiver == null) {
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iterator(array[i], i, array);
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} else {
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iterator.call(receiver, array[i], i, array);
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}
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}
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}
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};
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var forEachString = function forEachString(string, iterator, receiver) {
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for (var i = 0, len = string.length; i < len; i++) {
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// no such thing as a sparse string.
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if (receiver == null) {
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iterator(string.charAt(i), i, string);
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} else {
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iterator.call(receiver, string.charAt(i), i, string);
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}
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}
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};
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var forEachObject = function forEachObject(object, iterator, receiver) {
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for (var k in object) {
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if (hasOwnProperty.call(object, k)) {
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if (receiver == null) {
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iterator(object[k], k, object);
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} else {
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iterator.call(receiver, object[k], k, object);
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}
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}
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}
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};
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var forEach = function forEach(list, iterator, thisArg) {
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if (!isCallable(iterator)) {
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throw new TypeError('iterator must be a function');
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}
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var receiver;
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if (arguments.length >= 3) {
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receiver = thisArg;
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}
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if (toStr.call(list) === '[object Array]') {
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forEachArray(list, iterator, receiver);
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} else if (typeof list === 'string') {
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forEachString(list, iterator, receiver);
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} else {
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forEachObject(list, iterator, receiver);
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}
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};
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module.exports = forEach;
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