Run results for: JavaScript spread operator vs Object.assign performance again, non destructive

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/134.0.0.0 Safari/537.36

Browser: Chrome 134

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Using the spread operator

31.0M/s

Using Object.assign

18.4M/s

View exact numbers

Test name	Executions per second
✓ Using the spread operator	30,998,330 Ops/sec
Using Object.assign	18,369,130 Ops/sec

Tests:

Using the spread operator
const firstObject = { sampleData: 'Hello world', withMore: 'Example Data', andWith: 2000 } const secondObject = { moreData: 'foo bar' } const finalObject = { ...firstObject, ...secondObject };
Using Object.assign
const firstObject = { sampleData: 'Hello world', withMore: 'Example Data', andWith: 2000 } const secondObject = { moreData: 'foo bar' } const finalObject = Object.assign({}, firstObject, secondObject);