Run results for: Object filtering by key

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:136.0) Gecko/20100101 Firefox/136.0

Browser: Firefox 136

Operating system: Windows

Device Platform: Desktop

Date tested: one month ago

Script Preparation code:

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

Tests:

Reduce (object)
Object.keys(data) .filter(key => Number(key) % 2 === 0) .reduce((acc, key) => { acc[key] = data[key]; return acc; }, {});
Reduce (Map)
Object.keys(data) .filter(key => Number(key) % 2 === 0) .reduce((acc, key) => { acc.set(key, data[key]); return acc; }, new Map());
for-of (object)
const filter = (val) => { const result = {} for (const key in val) { if (Number(key) % 2 === 0) { continue; } result[key] = val[key]; } return result; };
for-of (Map)
const filter = (val) => { const result = new Map(); for (const key in val) { if (Number(key) % 2 === 0) { continue; } result.set(key, val[key]); } return Object.fromEntries(result.entries()); };