Run results for: 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/133.0.0.0 Safari/537.36

Browser: Chrome 133

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Benchmark engine: Benchmark.js

double filter

250K/s

forEach

96K/s

for

15K/s

View exact numbers

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