Benchmark: standard "for" vs "for...of"

Script Preparation code:

"use strict";

const LEN  = 1 << 18; // 262,144
const REPS = 32;

// Deterministic PRNG (LCG)
let seed = 0x12345678 | 0;
const nextInt = () => (seed = (Math.imul(seed, 1664525) + 1013904223) | 0);

const data = new Int32Array(LEN);
for (let i = 0; i < LEN; i++) data[i] = nextInt();

globalThis.__benchSink = 0;

const DATA = data;
const N = LEN;
const R = REPS;

Tests:

indexed for
let sum = 0; for (let r = 0; r < R; r++) { for (let i = 0; i < N; i++) { const newVal = DATA[i]; sum += newVal; } } globalThis.__benchSink = sum;
for...of
let sum = 0; for (let r = 0; r < R; r++) { for (const v of DATA) { sum += v; } } globalThis.__benchSink = sum;

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
indexed for
for...of

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 6 months ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:147.0) Gecko/20100101 Firefox/147.0

Browser/OS: Firefox 147 on Windows

View result in a separate tab

indexed for

314/s

for...of

49/s

View exact numbers

Test name	Executions per second
✓ indexed for	314 Ops/sec
for...of	49 Ops/sec

standard "for" vs "for...of" (version: 1)

Comparing performance of: `indexed for vs for...of`

Created: 6 months ago by: Guest

Go to the latest result

indexed for

for...of

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

standard "for" vs "for...of" (version: 1)

Comparing performance of: indexed for vs for...of

Created: 6 months ago by: Guest

Go to the latest result

indexed for

for...of

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Related benchmarks

Comparing performance of: `indexed for vs for...of`