Run results for: Reduce Object.assign vs spread

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/143.0.0.0 Safari/537.36

Browser: Chrome 143

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 7 months ago

Map

2.2M/s

Object.assign

1.0M/s

Spread

795K/s

View exact numbers

Script Preparation code:

const items = Array.from(Array(10).keys());

Tests:

Object.assign
const items = Array.from(Array(10).keys()); items.reduce((memo, val) => Object.assign(memo, { [`id-${val}`]: val }), {});
Map
const items = Array.from(Array(10).keys()); items.reduce((memo, val) => memo.set(`id-${val}`, val), new Map());
Spread
const items = Array.from(Array(10).keys()); items.reduce((memo, val) => ({ ...memo, [`id-${val}`]: val }), {});