Run results for: for, for-of, forEach

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/26.0.1 Safari/605.1.15

Browser: Safari 26

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 10 months ago

forEach

11K/s

for loop

11K/s

for-of const

9K/s

for-of var

9K/s

Array.prototype.forEach

9K/s

Iterator.prototype.forEach

412/s

iterator.forEach

406/s

View exact numbers

Script Preparation code:

var data = new Array(100_000).fill(1).map(() => ({}));

Tests:

for loop
for (var i = 0; i < data.length; ++i) { data[i].value = 7; }
for-of const
for (const o of data) { o.value = 7; }
for-of var
for (var o of data) { o.value = 7; }
forEach
data.forEach(o => { o.value = 7; });
Array.prototype.forEach
Array.prototype.forEach.call(data, o => { o.value = 7; });
iterator.forEach
data[Symbol.iterator]().forEach(o => { o.value = 7; });
Iterator.prototype.forEach
Iterator.prototype.forEach.call(data[Symbol.iterator](), o => { o.value = 7; });