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Object.keys vs for..in #jsbench #jsperf (http://jsbench.github.io/#b0a7de1bcb452ed7e6995ed5c2977dbf) #jsbench #jsperf
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset="utf-8"/> | |
| <title>Object.keys vs for..in #jsbench #jsperf</title> | |
| <script src="https://cdnjs.cloudflare.com/ajax/libs/benchmark/1.0.0/benchmark.min.js"></script> | |
| <script src="./suite.js"></script> | |
| </head> | |
| <body> | |
| <h1>Open the console to view the results</h1> | |
| <h2><code>cmd + alt + j</code> or <code>ctrl + alt + j</code></h2> | |
| </body> | |
| </html> |
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| "use strict"; | |
| (function (factory) { | |
| if (typeof Benchmark !== "undefined") { | |
| factory(Benchmark); | |
| } else { | |
| factory(require("benchmark")); | |
| } | |
| })(function (Benchmark) { | |
| var suite = new Benchmark.Suite; | |
| Benchmark.prototype.setup = function () { | |
| var data = (function( num ) { | |
| var uniqid = function(){ | |
| var text = "", | |
| i = 0, | |
| possible = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"; | |
| for( ; i < 32; i++ ) { | |
| text += possible.charAt( Math.floor( Math.random() * possible.length ) ); | |
| } | |
| return text; | |
| }, | |
| i = 0, | |
| obj = {}; | |
| for( ; i < num; i++ ) { | |
| obj[ uniqid() ] = new Date(); | |
| }; | |
| return obj; | |
| })(100000); | |
| }; | |
| suite.add("(function (obj) {", function () { | |
| (function (obj) { | |
| Object.keys( obj ).forEach(function( key ){ | |
| var waste = obj[ key ]; | |
| }); | |
| })(data) | |
| }); | |
| suite.add("(function (obj) {", function () { | |
| (function (obj) { | |
| var key; | |
| for( key in obj ) { | |
| if ( Object.prototype.hasOwnProperty.call(obj, key) ) { | |
| var waste = obj[ key ]; | |
| } | |
| } | |
| })(data) | |
| }); | |
| suite.on("cycle", function (evt) { | |
| console.log(" - " + evt.target); | |
| }); | |
| suite.on("complete", function (evt) { | |
| console.log(new Array(30).join("-")); | |
| var results = evt.currentTarget.sort(function (a, b) { | |
| return b.hz - a.hz; | |
| }); | |
| results.forEach(function (item) { | |
| console.log((idx + 1) + ". " + item); | |
| }); | |
| }); | |
| console.log("Object.keys vs for..in #jsbench #jsperf"); | |
| console.log(new Array(30).join("-")); | |
| suite.run(); | |
| }); |
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