Run results for: Object.fromEntries vs reduce vs property assignment vs Map

Run details:

User agent: Mozilla/5.0 (Android 13; Mobile; rv:142.0) Gecko/142.0 Firefox/142.0

Browser: Firefox Mobile 142

Operating system: Android

Device Platform: Mobile

Date tested: one year ago

Benchmark engine: Benchmark.js

Reduce

6K/s

Property Assignment

5K/s

Object.fromEntries

3K/s

Map

2K/s

View exact numbers

Script Preparation code:

var keys = Array(10000).fill(null).map((val, index) => index);

Tests:

Object.fromEntries
Object.fromEntries(keys.map((key) => [key, null]));
Reduce
keys.reduce((acc, k) => { acc[k] = null; return acc; }, {});
Property Assignment
const newObj = {}; keys.forEach((k) => { newObj[k] = null; });
Map
const newMap = new Map(); keys.forEach((k) => { newMap.set(k, null); });