kylpo/index.html

## index.html
<!DOCTYPE html>
<html>
<head>
	<meta charset="utf-8"/>
	<title>Untitled benchmark</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 original = {one: 1, two: 2, three: 3, four: 4, five: 5, six: 6}
		var keptKeys = ['one', 'three', 'five']
	};


	suite.add("var deleteCopy = Object.assign({}, original)", function () {
		var deleteCopy = Object.assign({}, original)
		delete deleteCopy.two
		delete deleteCopy.four
		delete deleteCopy.six
	});

	suite.add("var copy = {}", function () {
		var copy = {}
		for (let key in original) {
		    if (keptKeys.indexOf(key) > -1) {
		    copy[key] = original[key]
		  }
		}
	});

	suite.add("var deleteCopy = Object.assign({}, original)", function () {
		var deleteCopy = Object.assign({}, original)
		deleteCopy.two = undefined
		deleteCopy.four = undefined
		deleteCopy.six = undefined
	});

	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("Untitled benchmark");
	console.log(new Array(30).join("-"));
	suite.run();
});
	<!DOCTYPE html>
	<html>
	<head>
	<meta charset="utf-8"/>
	<title>Untitled benchmark</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 original = {one: 1, two: 2, three: 3, four: 4, five: 5, six: 6}
	var keptKeys = ['one', 'three', 'five']
	};


	suite.add("var deleteCopy = Object.assign({}, original)", function () {
	var deleteCopy = Object.assign({}, original)
	delete deleteCopy.two
	delete deleteCopy.four
	delete deleteCopy.six
	});

	suite.add("var copy = {}", function () {
	var copy = {}
	for (let key in original) {
	if (keptKeys.indexOf(key) > -1) {
	copy[key] = original[key]
	}
	}
	});

	suite.add("var deleteCopy = Object.assign({}, original)", function () {
	var deleteCopy = Object.assign({}, original)
	deleteCopy.two = undefined
	deleteCopy.four = undefined
	deleteCopy.six = undefined
	});

	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("Untitled benchmark");
	console.log(new Array(30).join("-"));
	suite.run();
	});