Run results for: for vs foreach vs for..in vs for..of (updated)

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/26.0.1 Safari/605.1.15

Browser: Safari 26

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 11 months ago

Benchmark engine: Benchmark.js

for

13.0M/s

foreach

485K/s

for..of

466K/s

for in

432K/s

View exact numbers

Script Preparation code:

const array = new Array(100);

Tests:

for
const LENGTH = array.length; for (let i = 0; i < LENGTH; i++) { array[i] = Math.random(); }
foreach
array.forEach(function(i) { array[i] = Math.random(); });
for in
for (let i in array) { array[i] = Math.random(); }
for..of
for (let i of array) { array[i] = Math.random(); }