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

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:140.0) Gecko/20100101 Firefox/140.0

Browser: Firefox 140

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

for in

31.2M/s

for

14.4M/s

foreach

10.8M/s

for..of

767K/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]; }