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Last active December 9, 2016 08:59
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index.html
<!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>
Raw
suite.js
"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);
}
}
}
function unswitchedForEach(array, callback, thisArg) {
var argsLength = callback.length;
var hasThisArg = arguments.length > 2;
if (hasThisArg) {
for (var i = 0, length = array.length; i < length; i++) {
callback.call(thisArg, array[i], i, array);
}
} else if (argsLength === 1) {
for (var i = 0, length = array.length; i < length; i++) {
callback(array[i]);
}
} else if (argsLength === 2) {
for (var i = 0, length = array.length; i < length; i++) {
callback(array[i], i);
}
} else {
for (var i = 0, length = array.length; i < length; i++) {
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.add("Unswitched", function () {
/** Unswitched **/
var sum = 0;
unswitchedForEach(source, function (val) {
sum += val;
});
});
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("Array#forEach");
console.log(new Array(30).join("-"));
suite.run();
});
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