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

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.36

Browser: Chrome 123

Operating system: Windows

Device Platform: Desktop

Date tested: 2 years ago

forEach

2.2M/s

for of

2.2M/s

forEach, separate callback

1.9M/s

for, external len

1.2M/s

for

819K/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]) }