73 lines
1.7 KiB
JavaScript
73 lines
1.7 KiB
JavaScript
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var isES5 = (function(){
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"use strict";
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return this === undefined;
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})();
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if (isES5) {
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module.exports = {
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freeze: Object.freeze,
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defineProperty: Object.defineProperty,
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keys: Object.keys,
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getPrototypeOf: Object.getPrototypeOf,
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isArray: Array.isArray,
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isES5: isES5,
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propertyIsWritable: function(obj, prop) {
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var descriptor = Object.getOwnPropertyDescriptor(obj, prop);
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return !!(!descriptor || descriptor.writable || descriptor.set);
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}
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};
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} else {
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var has = {}.hasOwnProperty;
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var str = {}.toString;
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var proto = {}.constructor.prototype;
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var ObjectKeys = function (o) {
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var ret = [];
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for (var key in o) {
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if (has.call(o, key)) {
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ret.push(key);
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}
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}
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return ret;
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};
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var ObjectDefineProperty = function (o, key, desc) {
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o[key] = desc.value;
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return o;
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};
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var ObjectFreeze = function (obj) {
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return obj;
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};
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var ObjectGetPrototypeOf = function (obj) {
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try {
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return Object(obj).constructor.prototype;
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}
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catch (e) {
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return proto;
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}
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};
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var ArrayIsArray = function (obj) {
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try {
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return str.call(obj) === "[object Array]";
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}
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catch(e) {
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return false;
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}
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};
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module.exports = {
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isArray: ArrayIsArray,
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keys: ObjectKeys,
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defineProperty: ObjectDefineProperty,
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freeze: ObjectFreeze,
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getPrototypeOf: ObjectGetPrototypeOf,
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isES5: isES5,
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propertyIsWritable: function() {
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return true;
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}
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};
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}
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