Run results for: for, for..of, forEach

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:126.0) Gecko/20100101 Firefox/126.0

Browser: Firefox 126

Operating system: Mac OS X 10.15

Device Platform: Desktop

Date tested: 2 years ago

for

148K/s

for, external len

148K/s

for of

32K/s

forEach

28K/s

forEach, separate callback

14K/s

View exact numbers

Script Preparation code:

var number = +prompt('Enter array length')
var arr = new Array(number).fill().map((_, i) => i);

function cb(i) {
  return i + i
}

Tests:

for of
for (const i of arr) { cb(i); }
forEach
arr.forEach((i) => { cb(i); });
forEach, separate callback
function _cb(i) { return cb(i) } arr.forEach((i) => { _cb(i); });
for
for (let i = 0; i < arr.length; i++) { cb(arr[i]) }
for, external len
const len = arr.length for (let i = 0; i < len; i++) { cb(arr[i]) }