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

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/141.0.0.0 Safari/537.36

Browser: Chrome 141

Operating system: Windows

Device Platform: Desktop

Date tested: 9 months ago

forEach

11K/s

for

5K/s

for of entries

2K/s

map

810/s

View exact numbers

Test name	Executions per second
✓ forEach	11,169 Ops/sec
for	5,139 Ops/sec
for of entries	2,105 Ops/sec
map	810 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); }