Run results for: JavaScript spread operator vs Object.assign performance reassign same variable

Run details:

User agent: Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:103.0) Gecko/20100101 Firefox/103.0

Browser: Firefox 103

Operating system: Windows 8.1

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
Using the spread operator	4643823.0 Ops/sec
Using Object.assign	10241612.0 Ops/sec

Tests:

Using the spread operator
let firstObject = { sampleData: 'Hello world' } const secondObject = { moreData: 'foo bar' } firstObject = {...firstObject, ...secondObject}
Using Object.assign
const firstObject = { sampleData: 'Hello world' } const secondObject = { moreData: 'foo bar' } Object.assign(firstObject, secondObject);