Run results for: JavaScript spread operator vs Object.assign performance fixed 2

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/114.0.0.0 Safari/537.36

Browser: Chrome 114

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 2 years ago

Using Object.assign

7.4M/s

Using the spread operator

5.1M/s

View exact numbers

Test name	Executions per second
✓ Using Object.assign	7,391,320 Ops/sec
Using the spread operator	5,050,028 Ops/sec

Script Preparation code:

var firstObject = { sampleData: 'Hello world' }
var secondObject = { moreData: 'foo bar' }

Tests:

Using the spread operator
const finalObject = { ...firstObject, ...secondObject };
Using Object.assign
const finalObject = Object.assign({}, firstObject, secondObject);