Run results for: for vs foreach vs for..in vs for..of - add object property

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:148.0) Gecko/20100101 Firefox/148.0

Browser: Firefox 148

Operating system: Linux

Device Platform: Desktop

Date tested: 4 months ago

for

1.2M/s

for..of

474K/s

foreach

461K/s

for in

52K/s

View exact numbers

Script Preparation code:

const objects = Array.from({ length: 1000 }, () => ({}));

Tests:

for
for (let i = 0, len = objects.length; i < len; i++) { objects[i].prop = 'erty'; }
foreach
objects.forEach(function(i) { i.prop = 'erty'; });
for in
for (let i in objects) { objects[i].prop = 'erty'; }
for..of
for (let i of objects) { i.prop = 'erty'; }