Run results for: forEach concat vs reduce push vs forEach push vs reduce concat performance

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/96.0.4664.110 Safari/537.36 Edg/96.0.1054.62

Browser: Chrome 96

Operating system: Windows

Device Platform: Desktop

Date tested: 2 years ago

Tests:

forEach concat
const a = [...Array(1000)].map(() => ({ nested: Array.from({length: 40}, () => Math.floor(Math.random() * 40)) })); let b = []; a.forEach((item) => { b = b.concat(item.nested); });
Reduce push
const a = [...Array(1000)].map(() => ({ nested: Array.from({length: 40}, () => Math.floor(Math.random() * 40)) })); const b = a.reduce((acc, item) => { acc.push(...item.nested); return acc }, []);
Reduce concat
const a = [...Array(1000)].map(() => ({ nested: Array.from({length: 40}, () => Math.floor(Math.random() * 40)) })); const b = a.reduce((acc, item) => { acc.concat(item.nested); return acc }, []);
forEach push
const a = [...Array(1000)].map(() => ({ nested: Array.from({length: 40}, () => Math.floor(Math.random() * 40)) })); let b = []; a.forEach((item) => { b.push(...item.nested); });