loopperf

loopperf.js

const _ = require("lodash");
const n = 10000, m = 10000;

const T = s => console.time(t = s);
const E = s => console.timeEnd(t);

console.log("Iterations:", n);
console.log("Subiterations:", m);
console.log();

let x, t, i, j;
const arrs = [];

for (i = 0; i < n; i++) {
	const arr = [];
	for (j = 0; j < m; j++)
		arr.push(j);
	arrs.push(arr);
}

T("for ... of");
x = 0;
for (const arr of arrs) {
	for (const v of arr)
	x += v;
}
E();

console.log();

T("forEach");
x = 0;
arrs.forEach(arr => arr.forEach(v => x += v));
E();

T("forEach (no return values)");
x = 0;
arrs.forEach(arr => { arr.forEach(v => { x += v }) });
E();

console.log();

T("_.forEach");
x = 0;
_.forEach(arrs, arr => _.forEach(arr, v => x += v));
E();

T("_.forEach (no return values)");
x = 0;
_.forEach(arrs, arr => { _.forEach(arr, v => { x += v }) });
E();