Run results for: for (cache length) vs foreach vs for..in vs for..of

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Brave/1 Version/26.4 Safari/605.1.15

Browser: Safari 26

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 3 months ago

for in

7.2M/s

foreach

444K/s

for

349K/s

for..of

204K/s

View exact numbers

Script Preparation code:

var array = new Array(100);

Tests:

for
var arrLength = array.length; for (var i = 0; i < arrLength; i++) { array[i]; }
foreach
array.forEach(function(i) { array[i]; });
for in
for (var i in array) { array[i]; }
for..of
for (var i of array) { array[i]; }