warpech/index.html

## index.html
<!DOCTYPE html>
<html>
<head>
	<meta charset="utf-8"/>
	<title>Array write #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 length = 10000;
	};


	suite.add("naive", function () {
		// naive
		const naiveArray = [];
		for(let i = 0; i < length; i++) {
		    naiveArray.push(true);
		}
	});

	suite.add("preallocated", function () {
		// preallocated
		const preallocatedArray = new Array(length);
		for(let i = 0; i < length; i++) {
		    preallocatedArray[i] = true;
		}

		/*
		Conclusion (Chrome & FF): Preallocated arrays are faster for writes than naive arrays, because preallocated don't need to recalculate indexes

		See:
		https://github.com/babel/babel/issues/6233
		https://v8.dev/blog/elements-kinds
		*/
	});

	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("Array write #jsbench #jsperf");
	console.log(new Array(30).join("-"));
	suite.run();
});
	<!DOCTYPE html>
	<html>
	<head>
	<meta charset="utf-8"/>
	<title>Array write #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 length = 10000;
	};


	suite.add("naive", function () {
	// naive
	const naiveArray = [];
	for(let i = 0; i < length; i++) {
	naiveArray.push(true);
	}
	});

	suite.add("preallocated", function () {
	// preallocated
	const preallocatedArray = new Array(length);
	for(let i = 0; i < length; i++) {
	preallocatedArray[i] = true;
	}

	/*
	Conclusion (Chrome & FF): Preallocated arrays are faster for writes than naive arrays, because preallocated don't need to recalculate indexes

	See:
	https://github.com/babel/babel/issues/6233
	https://v8.dev/blog/elements-kinds
	*/
	});

	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("Array write #jsbench #jsperf");
	console.log(new Array(30).join("-"));
	suite.run();
	});