Run results for: JavaScript spread operator vs Object.assign (to new obj) performance

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:143.0) Gecko/20100101 Firefox/143.0

Browser: Firefox 143

Operating system: Mac OS X 10.15

Device Platform: Desktop

Date tested: 10 months ago

Using Object.assign

33.2M/s

Using the spread operator

21.2M/s

View exact numbers

Test name	Executions per second
✓ Using Object.assign	33,224,316 Ops/sec
Using the spread operator	21,234,650 Ops/sec

Tests:

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