bench_array_create.js
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bench_array_create.js
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	/*
	* Array creation micro-bench
	*/

	function get_clock() {
	if (typeof performance !== 'undefined' && performance.now) return performance.now();
	return Date.now();
	}

	function run_case(name, fn, iters) {
	var i;
	var t0 = get_clock();
	for (i = 0; i < iters; i++) fn();
	var dt = get_clock() - t0;
	console.log(name + ': ' + dt.toFixed(2) + ' ms');
	}

	function create_assign() {
	var tab = [];
	for (var i = 0; i < 1000; i++) tab[i] = i;
	}

	function create_push() {
	var tab = [];
	for (var i = 0; i < 1000; i++) tab.push(i);
	}

	function create_prealloc_assign() {
	var tab = [];
	tab.length = 1000;
	for (var i = 0; i < 1000; i++) tab[i] = i;
	}

	function create_prealloc_push() {
	var tab = [];
	tab.length = 1000;
	for (var i = 0; i < 1000; i++) tab.push(i);
	}

	function main() {
	var iters = 200;
	run_case('create_assign', create_assign, iters);
	run_case('create_push', create_push, iters);
	run_case('create_prealloc_assign', create_prealloc_assign, iters);
	run_case('create_prealloc_push', create_prealloc_push, iters);

	var arr = [];
	var t0 = get_clock();
	for (var i = 0; i < 20000; i++) {
	arr.push(i);
	}
	var dt = get_clock() - t0;
	console.log('push_20k: ' + dt.toFixed(2) + ' ms');
	console.log('done, arr length: ' + arr.length);
	console.log('first element: ' + arr[0]);
	console.log('last element: ' + arr[19999]);
	}

	main();