shousper/index.html

## index.html
<!DOCTYPE html>
<html>
<head>
	<meta charset="utf-8"/>
	<title>for-in +/- hasOwnProperty 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>

## 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 object = {};
		for (var i = 0; i < 5000; i++) {
		    object['k'+i] = i
		}
		var keyCache = Object.keys(object);
	};


	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 = [];
		for (var key in Object.keys(object)) {
		    values.push(object[key]);
		}
	});

	suite.add("Object.keys (efficient)", function () {
		/** Object.keys (efficient) **/
		var values = [];
		var keys = Object.keys(object);
		for (var i = 0; i < keys.length; i++) {
		    values.push(object[keys[i]]);
		}
	});

	suite.add("Cached keys", function () {
		/** Cached keys **/
		var values = [];
		for (var key in keyCache) {
		    values.push(object[key]);
		}
	});

	suite.add("Cached keys (efficient)", function () {
		/** Cached keys (efficient) **/
		var values = [];
		for (var i = 0; i < keyCache.length; i++) {
		    values.push(object[keyCache[i]]);
		}
	});

	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 +/- hasOwnProperty vs. Object.keys vs. Сached keys");
	console.log(new Array(30).join("-"));
	suite.run();
});
	<!DOCTYPE html>
	<html>
	<head>
	<meta charset="utf-8"/>
	<title>for-in +/- hasOwnProperty 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>
	"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 < 5000; i++) {
	object['k'+i] = i
	}
	var keyCache = Object.keys(object);
	};


	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 = [];
	for (var key in Object.keys(object)) {
	values.push(object[key]);
	}
	});

	suite.add("Object.keys (efficient)", function () {
	/ Object.keys (efficient) /
	var values = [];
	var keys = Object.keys(object);
	for (var i = 0; i < keys.length; i++) {
	values.push(object[keys[i]]);
	}
	});

	suite.add("Cached keys", function () {
	/ Cached keys /
	var values = [];
	for (var key in keyCache) {
	values.push(object[key]);
	}
	});

	suite.add("Cached keys (efficient)", function () {
	/ Cached keys (efficient) /
	var values = [];
	for (var i = 0; i < keyCache.length; i++) {
	values.push(object[keyCache[i]]);
	}
	});

	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 +/- hasOwnProperty vs. Object.keys vs. Сached keys");
	console.log(new Array(30).join("-"));
	suite.run();
	});