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

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; rv:109.0) Gecko/20100101 Firefox/115.0

Browser: Firefox 115

Operating system: Windows

Device Platform: Desktop

Date tested: 8 months ago

for

779K/s

for in

36K/s

for..of

24K/s

foreach

24K/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(); }