Run results for: filter vs foreach

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/96.0.4664.55 Safari/537.36

Browser: Chrome 96

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
filter	3694519.0 Ops/sec
forEach	2513979.0 Ops/sec

Script Preparation code:


var arr = [];
for(i=0; i<100; i++){
  Math.random() > .5 ? arr.push({is_group: true}) : arr.push({is_group: false})
}

Tests:

filter
const a = arr.filter(i => i.is_group)
forEach
const a = []; const b = []; arr.forEach(i => { if (i.is_group) { a.push(i) } else { b.push(i) } })