2a09d1a4
 liuqimichale
添加宜春 天水 宣化
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'use strict';
var isCallable = require('is-callable');
var toStr = Object.prototype.toString;
var hasOwnProperty = Object.prototype.hasOwnProperty;
var forEachArray = function forEachArray(array, iterator, receiver) {
for (var i = 0, len = array.length; i < len; i++) {
if (hasOwnProperty.call(array, i)) {
if (receiver == null) {
iterator(array[i], i, array);
} else {
iterator.call(receiver, array[i], i, array);
}
}
}
};
var forEachString = function forEachString(string, iterator, receiver) {
for (var i = 0, len = string.length; i < len; i++) {
// no such thing as a sparse string.
if (receiver == null) {
iterator(string.charAt(i), i, string);
} else {
iterator.call(receiver, string.charAt(i), i, string);
}
}
};
var forEachObject = function forEachObject(object, iterator, receiver) {
for (var k in object) {
if (hasOwnProperty.call(object, k)) {
if (receiver == null) {
iterator(object[k], k, object);
} else {
iterator.call(receiver, object[k], k, object);
}
}
}
};
var forEach = function forEach(list, iterator, thisArg) {
if (!isCallable(iterator)) {
throw new TypeError('iterator must be a function');
}
var receiver;
if (arguments.length >= 3) {
receiver = thisArg;
}
if (toStr.call(list) === '[object Array]') {
forEachArray(list, iterator, receiver);
} else if (typeof list === 'string') {
forEachString(list, iterator, receiver);
} else {
forEachObject(list, iterator, receiver);
}
};
module.exports = forEach;
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