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December 15, 2015 08:04
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for-in vs. Object.keys vs. Сached keys (http://jsbench.github.io/#f34ddf20244c94a49e7e) #jsbench #jsperf
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset="utf-8"/> | |
| <title>for-in vs. Object.keys vs. Сached keys</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 = { | |
| foo: 1, | |
| bar: 2, | |
| baz: 3, | |
| qux: 4 | |
| }; | |
| var objKeys = Object.keys(object); | |
| var forKeys = []; | |
| for (var key in object) { | |
| if (object.hasOwnProperty(key)) { | |
| forKeys.push(key); | |
| } | |
| } | |
| }; | |
| suite.add("for-in", function () { | |
| /** for-in **/ | |
| var values = []; | |
| for (var key in object) { | |
| values.push(object[key]); | |
| } | |
| }); | |
| suite.add("for in + hasOwnProperty", function () { | |
| /** for in + hasOwnProperty **/ | |
| var values = []; | |
| for (var key in object) { | |
| if (object.hasOwnProperty(key)) { | |
| values.push(object[key]); | |
| } | |
| } | |
| }); | |
| suite.add("Object.keys", function () { | |
| /** Object.keys **/ | |
| var values = [], i = 0, n = objKeys.length; | |
| for (; i < n; i++) { | |
| values.push(object[objKeys[i]]); | |
| } | |
| }); | |
| suite.add("Cached keys", function () { | |
| /** Cached keys **/ | |
| var values = [], i = 0, n = forKeys.length; | |
| for (; i < n; i++) { | |
| values.push(object[forKeys[i]]); | |
| } | |
| }); | |
| suite.on("cycle", function (evt) { | |
| console.log(" " + evt); | |
| }); | |
| suite.on("complete", function (evt) { | |
| var results = evt.currentTarget.sort(function (a, b) { | |
| return b.hz - a.hz; | |
| }); | |
| results.forEach(function (item) { | |
| console.log(" " + item); | |
| }); | |
| }); | |
| console.log("for-in vs. Object.keys vs. Сached keys"); | |
| console.log(new Array(30).join("-")); | |
| suite.run(); | |
| }); |
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