milahu/index.html

## index.html
<!DOCTYPE html>
<html>
<head>
	<meta charset="utf-8"/>
	<title>get last item / key / value in map #jsbench #jsperf</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 map = new Map();

		for (let i = 0; i < 100; i++) {
		  map.set(
		    "key_"+Math.random(),
		    "value_"+Math.random()
		  );
		}

		const F1 = {};
		F1.getLastItemInMap = map => Array.from(map)[map.size-1];
		F1.getLastKeyInMap = map => Array.from(map)[map.size-1][0];
		F1.getLastValueInMap = map => Array.from(map)[map.size-1][1];

		const F2 = {};
		F2.lastItemInMap = map => Array.from(map).pop();
		F2.lastKeyInMap = map => Array.from(map.keys()).pop();
		F2.lastValueInMap = map => Array.from(map.values()).pop();

		const F3 = {};
		F3.lastItemInMap = map => [...map].pop();
		F3.lastKeyInMap = map => [...map.keys()].pop();
		F3.lastValueInMap = map => [...map.values()].pop();
	};


	suite.add("F1.getLastItemInMap(map);", function () {
		F1.getLastItemInMap(map);
	});

	suite.add("F1.getLastKeyInMap(map);", function () {
		F1.getLastKeyInMap(map);
	});

	suite.add("F1.getLastValueInMap(map);", function () {
		F1.getLastValueInMap(map);
	});

	suite.add("F2.lastItemInMap(map);", function () {
		F2.lastItemInMap(map);
	});

	suite.add("F2.lastKeyInMap(map);", function () {
		F2.lastKeyInMap(map);
	});

	suite.add("F2.lastValueInMap(map);", function () {
		F2.lastValueInMap(map);
	});

	suite.add("F3.lastItemInMap(map);", function () {
		F3.lastItemInMap(map);
	});

	suite.add("F3.lastKeyInMap(map);", function () {
		F3.lastKeyInMap(map);
	});

	suite.add("F3.lastValueInMap(map);", function () {
		F3.lastValueInMap(map);
	});

	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("get last item / key / value in map #jsbench #jsperf");
	console.log(new Array(30).join("-"));
	suite.run();
});
	<!DOCTYPE html>
	<html>
	<head>
	<meta charset="utf-8"/>
	<title>get last item / key / value in map #jsbench #jsperf</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 map = new Map();

	for (let i = 0; i < 100; i++) {
	map.set(
	"key_"+Math.random(),
	"value_"+Math.random()
	);
	}

	const F1 = {};
	F1.getLastItemInMap = map => Array.from(map)[map.size-1];
	F1.getLastKeyInMap = map => Array.from(map)[map.size-1][0];
	F1.getLastValueInMap = map => Array.from(map)[map.size-1][1];

	const F2 = {};
	F2.lastItemInMap = map => Array.from(map).pop();
	F2.lastKeyInMap = map => Array.from(map.keys()).pop();
	F2.lastValueInMap = map => Array.from(map.values()).pop();

	const F3 = {};
	F3.lastItemInMap = map => [...map].pop();
	F3.lastKeyInMap = map => [...map.keys()].pop();
	F3.lastValueInMap = map => [...map.values()].pop();
	};


	suite.add("F1.getLastItemInMap(map);", function () {
	F1.getLastItemInMap(map);
	});

	suite.add("F1.getLastKeyInMap(map);", function () {
	F1.getLastKeyInMap(map);
	});

	suite.add("F1.getLastValueInMap(map);", function () {
	F1.getLastValueInMap(map);
	});

	suite.add("F2.lastItemInMap(map);", function () {
	F2.lastItemInMap(map);
	});

	suite.add("F2.lastKeyInMap(map);", function () {
	F2.lastKeyInMap(map);
	});

	suite.add("F2.lastValueInMap(map);", function () {
	F2.lastValueInMap(map);
	});

	suite.add("F3.lastItemInMap(map);", function () {
	F3.lastItemInMap(map);
	});

	suite.add("F3.lastKeyInMap(map);", function () {
	F3.lastKeyInMap(map);
	});

	suite.add("F3.lastValueInMap(map);", function () {
	F3.lastValueInMap(map);
	});

	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("get last item / key / value in map #jsbench #jsperf");
	console.log(new Array(30).join("-"));
	suite.run();
	});