bench_includes_generic_proxy.cjs
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bench_includes_generic_proxy.cjs
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	function runBench(label, fn, options) {
	const warmup = options && options.warmup ? options.warmup : 5;
	const samples = options && options.samples ? options.samples : 10;

	for (let i = 0; i < warmup; i++) fn();

	let min = Infinity;
	let max = -Infinity;
	let total = 0;
	let last = 0;

	for (let i = 0; i < samples; i++) {
	const start = performance.now();
	last = fn();
	const elapsed = performance.now() - start;
	if (elapsed < min) min = elapsed;
	if (elapsed > max) max = elapsed;
	total += elapsed;
	}

	console.log(label);
	console.log(` result: ${last}`);
	console.log(` mean: ${ (total / samples).toFixed(3) } ms`);
	console.log(` min: ${ min.toFixed(3) } ms`);
	console.log(` max: ${ max.toFixed(3) } ms`);
	}

	const generic = {
	get length() {
	return 1024;
	},
	get 1023() {
	return 1;
	}
	};

	const proxy = new Proxy(
	{ length: 4, 0: NaN, 1: 0, 2: NaN, 3: 1 },
	{
	get(target, key) {
	return target[key];
	}
	}
	);

	runBench("generic array-like with getter", () => {
	let hits = 0;
	for (let r = 0; r < 20000; r++) {
	if ([].includes.call(generic, 1, 1023)) hits++;
	}
	return hits;
	});

	runBench("proxy includes", () => {
	let hits = 0;
	for (let r = 0; r < 20000; r++) {
	if (Array.prototype.includes.call(proxy, NaN, 1)) hits++;
	}
	return hits;
	});