Benchmark: double filter vs foreach2

Script Preparation code:


var arr = [];
for(i=0; i<10000; 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 (Macintosh; Intel Mac OS X 11_2_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/89.0.4389.128 Safari/537.36

Browser/OS: Chrome 89 on Mac OS X 11.2.3

Test name	Executions per second
filter	3287.5 Ops/sec
forEach	4017.7 Ops/sec

double filter vs foreach2 (version: 0)