Run results for: map vs obj xzdd

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/144.0.0.0 Safari/537.36

Browser: Chrome 144

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 3 months ago

Test name	Executions per second
Using the spread operator	46.4 Ops/sec
Using Object.assign	110.1 Ops/sec

Script Preparation code:

const data = new Array(1000000)
	.fill(1)
	.map((item) => Math.floor(Math.random() * 10000))

Tests:

Using the spread operator
const map = new Map(); data.forEach((item) => { map.set(item, Math.random()); });
Using Object.assign
const map = {} data.forEach((item) => { map[item] = Math.random(); });