Run results for: double-filter vs foreach vs for

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/87.0.4280.88 Safari/537.36

Browser: Chrome 87

Operating system: Windows

Device Platform: Desktop

Date tested: 3 years ago

Script Preparation code:


var arr = [];
for(i=0; i<1000; i++){
  Math.random() > .5 ? arr.push({is_group: true}) : arr.push({is_group: false})
}

Tests:

double filter
const a = arr.filter(i => i.is_group) const b = 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) } })
for
const a = []; const b = []; for(i=0; i<1000; i++){ if (arr[i].is_group) { a.push(arr[i]) } else { b.push(arr[i]) } }