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63 lines
1.5 KiB
JavaScript
63 lines
1.5 KiB
JavaScript
(function () {
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"use strict";
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// modified from https://github.com/kriskowal/es5-shim
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var has = Object.prototype.hasOwnProperty,
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toString = Object.prototype.toString,
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forEach = require('./foreach'),
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isArgs = require('./isArguments'),
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hasDontEnumBug = !({'toString': null}).propertyIsEnumerable('toString'),
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hasProtoEnumBug = (function () {}).propertyIsEnumerable('prototype'),
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dontEnums = [
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"toString",
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"toLocaleString",
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"valueOf",
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"hasOwnProperty",
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"isPrototypeOf",
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"propertyIsEnumerable",
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"constructor"
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],
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keysShim;
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keysShim = function keys(object) {
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var isObject = object !== null && typeof object === 'object',
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isFunction = toString.call(object) === '[object Function]',
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isArguments = isArgs(object),
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theKeys = [];
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if (!isObject && !isFunction && !isArguments) {
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throw new TypeError("Object.keys called on a non-object");
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}
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if (isArguments) {
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forEach(object, function (value) {
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theKeys.push(value);
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});
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} else {
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var name,
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skipProto = hasProtoEnumBug && isFunction;
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for (name in object) {
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if (!(skipProto && name === 'prototype') && has.call(object, name)) {
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theKeys.push(name);
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}
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}
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}
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if (hasDontEnumBug) {
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var ctor = object.constructor,
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skipConstructor = ctor && ctor.prototype === object;
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forEach(dontEnums, function (dontEnum) {
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if (!(skipConstructor && dontEnum === 'constructor') && has.call(object, dontEnum)) {
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theKeys.push(dontEnum);
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}
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});
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}
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return theKeys;
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};
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module.exports = keysShim;
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}());
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