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

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/136.0.0.0 Safari/537.36 Edg/136.0.0.0

Browser: Chrome 136

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

for

1.1M/s

for in

134K/s

foreach

109K/s

for..of

106K/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(); }