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October 19, 2015 16:10
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Array#forEach (http://jsbench.github.io/#934845e96f163934870e) #jsbench #jsperf
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset="utf-8"/> | |
| <title>Array#forEach</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 source = Array.apply(null, new Array(1e2)).map(function () { | |
| return Math.random(); | |
| }); | |
| function simpleForEach(array, callback, thisArg) { | |
| for (var i = 0, length = array.length; i < length; i++) { | |
| callback.call(thisArg, array[i], i, array); | |
| } | |
| } | |
| function optimizedForEach(array, callback, thisArg) { | |
| var argsLength = callback.length; | |
| var hasThisArg = arguments.length > 2; | |
| for (var i = 0, length = array.length; i < length; i++) { | |
| if (hasThisArg) { | |
| callback.call(thisArg, array[i], i, array); | |
| } else if (argsLength === 1) { | |
| callback(array[i]); | |
| } else if (argsLength === 2) { | |
| callback(array[i], i); | |
| } else { | |
| callback(array[i], i, array); | |
| } | |
| } | |
| } | |
| }; | |
| suite.add("Native", function () { | |
| /** Native **/ | |
| var sum = 0; | |
| source.forEach(function (val) { | |
| sum += val; | |
| }); | |
| }); | |
| suite.add("Simple", function () { | |
| /** Simple **/ | |
| var sum = 0; | |
| simpleForEach(source, function (val) { | |
| sum += val; | |
| }); | |
| }); | |
| suite.add("Optimized", function () { | |
| /** Optimized **/ | |
| var sum = 0; | |
| optimizedForEach(source, function (val) { | |
| sum += val; | |
| }); | |
| }); | |
| 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("Array#forEach"); | |
| console.log(new Array(30).join("-")); | |
| suite.run(); | |
| }); |
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