jridgewell/index.html

## index.html
<!DOCTYPE html>
<html>
<head>
	<meta charset="utf-8"/>
	<title>Class Fields vs This Assignment vs Object.defineProperty(this)</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 () {
		class ClassFields {
		    a = Math.random();
		    b = Math.random();
		}

		function Assignment() {
		    this.a = Math.random();
		    this.b = Math.random();
		}

		function DefinePropertyNonEnumerable() {
		    this.a = Math.random();
		    this.b = Math.random();
		}

		function DefinePropertyNonEnumerableShorthand() {
		    this.a = Math.random();
		    this.b = Math.random();
		}

		function nonEnumerable(obj, prop, value) {
		    Object.defineProperty(obj, prop, { value, writable: true, enumerable: false });
		}

		function nonEnumerableShorthand(obj, prop, value) {
		    Object.defineProperty(obj, prop, { value, writable: true });
		}
	};


	suite.add("const obj = new ClassFields();", function () {
		const obj = new ClassFields();
		const c = obj.a < 0.5 ? 'a' : obj.b < 0.5 ? 'b' : 'c';
	});

	suite.add("const obj = new Assignment();", function () {
		const obj = new Assignment();
		const c = obj.a < 0.5 ? 'a' : obj.b < 0.5 ? 'b' : 'c';
	});

	suite.add("const obj = new DefinePropertyNonEnumerable();", function () {
		const obj = new DefinePropertyNonEnumerable();
		const c = obj.a < 0.5 ? 'a' : obj.b < 0.5 ? 'b' : 'c';
	});

	suite.add("const obj = new DefinePropertyNonEnumerableShorthand();", function () {
		const obj = new DefinePropertyNonEnumerableShorthand();
		const c = obj.a < 0.5 ? 'a' : obj.b < 0.5 ? 'b' : 'c';
	});

	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("Class Fields vs This Assignment vs Object.defineProperty(this)");
	console.log(new Array(30).join("-"));
	suite.run();
});
	<!DOCTYPE html>
	<html>
	<head>
	<meta charset="utf-8"/>
	<title>Class Fields vs This Assignment vs Object.defineProperty(this)</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 () {
	class ClassFields {
	a = Math.random();
	b = Math.random();
	}

	function Assignment() {
	this.a = Math.random();
	this.b = Math.random();
	}

	function DefinePropertyNonEnumerable() {
	this.a = Math.random();
	this.b = Math.random();
	}

	function DefinePropertyNonEnumerableShorthand() {
	this.a = Math.random();
	this.b = Math.random();
	}

	function nonEnumerable(obj, prop, value) {
	Object.defineProperty(obj, prop, { value, writable: true, enumerable: false });
	}

	function nonEnumerableShorthand(obj, prop, value) {
	Object.defineProperty(obj, prop, { value, writable: true });
	}
	};


	suite.add("const obj = new ClassFields();", function () {
	const obj = new ClassFields();
	const c = obj.a < 0.5 ? 'a' : obj.b < 0.5 ? 'b' : 'c';
	});

	suite.add("const obj = new Assignment();", function () {
	const obj = new Assignment();
	const c = obj.a < 0.5 ? 'a' : obj.b < 0.5 ? 'b' : 'c';
	});

	suite.add("const obj = new DefinePropertyNonEnumerable();", function () {
	const obj = new DefinePropertyNonEnumerable();
	const c = obj.a < 0.5 ? 'a' : obj.b < 0.5 ? 'b' : 'c';
	});

	suite.add("const obj = new DefinePropertyNonEnumerableShorthand();", function () {
	const obj = new DefinePropertyNonEnumerableShorthand();
	const c = obj.a < 0.5 ? 'a' : obj.b < 0.5 ? 'b' : 'c';
	});

	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("Class Fields vs This Assignment vs Object.defineProperty(this)");
	console.log(new Array(30).join("-"));
	suite.run();
	});