Run results for: Array loop: forEach vs for vs map vs for of entries with larger array

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:145.0) Gecko/20100101 Firefox/145.0

Browser: Firefox 145

Operating system: Mac OS X 10.15

Device Platform: Desktop

Date tested: 9 months ago

for

10K/s

map

3K/s

forEach

3K/s

for of entries

1K/s

View exact numbers

Test name	Executions per second
✓ for	9,916 Ops/sec
map	2,798 Ops/sec
forEach	2,672 Ops/sec
for of entries	1,136 Ops/sec

Script Preparation code:

   var arr = [];
    for (var i = 0; i < 100_000; i++) {
      arr[i] = i;
    }
  
    function someFn(x, i) {
      return x * i * 3 * 8;
    }

Tests:

forEach
arr.forEach(someFn)
for
for (var i = 0, len = arr.length; i < len; i++) { someFn(arr[i], i); }
map
arr.map(someFn)
for of entries
for (const [x, i] of arr.entries()) { someFn(x, i); }