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

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:132.0) Gecko/20100101 Firefox/132.0

Browser: Firefox 132

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Property Assignment

14K/s

Reduce

12K/s

Object.fromEntries

4K/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; });