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Last active August 7, 2016 05:10
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for-in vs. Object.keys vs. Сached keys vs. rorEach vs. while (http://jsbench.github.io/#22211482bdf21f09ca4a366227857af0) #jsbench #jsperf
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8"/>
<title>for-in vs. Object.keys vs. Сached keys vs. rorEach vs. while</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>
"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.add("forEach", function () {
/** forEach **/
var values = [];
Object.keys(object).forEach(function (val) {
values.push(val);
});
});
suite.add("While Dec", function () {
/** While Dec **/
var values = [], i = 0, l = Object.keys(object).length;
while (l) {
values.push(object[i])
i ++;
l--;
}
});
suite.add("While Dec 2", function () {
/** While Dec 2 **/
var values = [], l = Object.keys(object).length;
while (l) {
values.push(object[l])
l--;
}
});
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("for-in vs. Object.keys vs. Сached keys vs. rorEach vs. while");
console.log(new Array(30).join("-"));
suite.run();
});
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