Created
August 26, 2016 08:04
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(key in object) vs. (object[key] !== void 0) vs. object.hasOwnProperty(key) (http://jsbench.github.io/#1aebf699d73fb743127903c0b0a8bece) #jsbench #jsperf
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset="utf-8"/> | |
| <title>(key in object) vs. (object[key] !== void 0) vs. object.hasOwnProperty(key)</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 object = {}; | |
| for (var i = 0; i < 5; i++) { | |
| object[i + '_' + Math.random()] = Math.random(); | |
| } | |
| }; | |
| suite.add("in", function () { | |
| /** in **/ | |
| var results = []; | |
| for (var i = 0; i < 10; i++) { | |
| var key = '_' + Math.random() + i; | |
| (key in object) && results.push(key); | |
| } | |
| if (results.length) throw 'wtf?'; | |
| }); | |
| suite.add("void 0", function () { | |
| /** void 0 **/ | |
| var results = []; | |
| for (var i = 0; i < 10; i++) { | |
| var key = '_' + Math.random() + i; | |
| (object[key] !== void 0) && results.push(key); | |
| } | |
| if (results.length) throw 'wtf?'; | |
| }); | |
| suite.add("hasOwnProperty", function () { | |
| /** hasOwnProperty **/ | |
| var results = []; | |
| for (var i = 0; i < 10; i++) { | |
| var key = '_' + Math.random() + i; | |
| object.hasOwnProperty(key) && results.push(key); | |
| } | |
| if (results.length) throw 'wtf?'; | |
| }); | |
| 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("(key in object) vs. (object[key] !== void 0) vs. object.hasOwnProperty(key)"); | |
| console.log(new Array(30).join("-")); | |
| suite.run(); | |
| }); |
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