Benchmark: double filter vs foreach

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) 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) } })

Rendered benchmark preparation results:

Previous results

Test case name	Result
filter
forEach

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Latest run results:

Run details: (Test run date: 3 years ago)

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/OS: Chrome 87 on Windows

Test name	Executions per second
filter	987200.1 Ops/sec
forEach	1079541.0 Ops/sec

double filter vs foreach (version: 0)