Run results for: object.entries vs reduce

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36

Browser: Chrome 120

Operating system: Windows

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
Entries	534.8 Ops/sec
reduce	714.7 Ops/sec

Script Preparation code:

var data = { ...Array.from(Array(10000).keys()) };

Tests:

Entries
const entries = [] for (const key of Object.keys(data)) { if (data[key] % 2 === 0) { entries.push([key, key.toString()]) } } Object.fromEntries(entries)
reduce
Object.keys(data) .reduce((ret, key) => { if (data[key] % 2 === 0) { ret[key] = key.toString(); } return ret }, {})