Run results for: Reduce: concat vs push

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/142.0.0.0 Safari/537.36 Edg/142.0.0.0

Browser: Chrome 142

Operating system: Windows

Device Platform: Desktop

Date tested: 6 months ago

Test name	Executions per second
Reduce + concat	154008.3 Ops/sec
Reduce + push	7193.7 Ops/sec

Script Preparation code:

a = new Array(1000).fill(0).map(() => ({
    value: Math.random(),
    keep: Math.random() > 0.5
}));

Tests:

Reduce + concat
a.reduce((acc, { value, keep }) => { if (keep) { acc.push(value); } return acc; }, []);
Reduce + push
a.reduce((acc, { value, keep }) => (keep ? acc.concat([value]) : acc), []);