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

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/102.0.0.0 Safari/537.36

Browser: Chrome 102

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

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); });