Lodin/index.html

## index.html
<!DOCTYPE html>
<html>
<head>
	<meta charset="utf-8"/>
	<title>map vs object entries loop performance</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 () {
		const obj = (() => {
		    const res = {};
		    for (let i = 0; i < 1000; i++) {
		        res[`a${i}`] = i * 100;
		    }

		    return res;
		})();

		const map = (() => {
		    const res = new Map();
		    for (let i = 0; i < 1000; i++) {
		        res.set(`a${i}`, i * 100);
		    }

		    return res;
		})();

		const obj2 = {...obj};
		obj2[Symbol.iterator] = function * () {
		    for (const prop in this) {
		        yield [prop, this[prop]];
		    }
		}
	};


	suite.add("let a, b;", function () {
		let a, b;

		for (const [key, value] of Object.entries(obj)) {
		    a = key;
		    b = value
		}
	});

	suite.add("let a, b;", function () {
		let a, b;

		for (const [key, value] of map) {
		    a = key;
		    b = value;
		}
	});

	suite.add("let a, b;", function () {
		let a, b;

		for (const [key, value] of obj2) {
		    a = key;
		    b = value;
		}
	});

	suite.add("let a, b;", function () {
		let a, b;

		for (const key in obj) {
		    a = key;
		    b = obj[key];
		}
	});

	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("map vs object entries loop performance");
	console.log(new Array(30).join("-"));
	suite.run();
});
	<!DOCTYPE html>
	<html>
	<head>
	<meta charset="utf-8"/>
	<title>map vs object entries loop performance</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 () {
	const obj = (() => {
	const res = {};
	for (let i = 0; i < 1000; i++) {
	res[`a${i}`] = i * 100;
	}

	return res;
	})();

	const map = (() => {
	const res = new Map();
	for (let i = 0; i < 1000; i++) {
	res.set(`a${i}`, i * 100);
	}

	return res;
	})();

	const obj2 = {...obj};
	obj2[Symbol.iterator] = function * () {
	for (const prop in this) {
	yield [prop, this[prop]];
	}
	}
	};


	suite.add("let a, b;", function () {
	let a, b;

	for (const [key, value] of Object.entries(obj)) {
	a = key;
	b = value
	}
	});

	suite.add("let a, b;", function () {
	let a, b;

	for (const [key, value] of map) {
	a = key;
	b = value;
	}
	});

	suite.add("let a, b;", function () {
	let a, b;

	for (const [key, value] of obj2) {
	a = key;
	b = value;
	}
	});

	suite.add("let a, b;", function () {
	let a, b;

	for (const key in obj) {
	a = key;
	b = obj[key];
	}
	});

	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("map vs object entries loop performance");
	console.log(new Array(30).join("-"));
	suite.run();
	});