Run results for: JavaScript spread operator vs Object.assign performance (single addition)

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/142.0.0.0 Safari/537.36

Browser: Chrome 142

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 8 months ago

Using the spread operator

78.1M/s

Using Object.assign

37.6M/s

View exact numbers

Test name	Executions per second
✓ Using the spread operator	78,138,048 Ops/sec
Using Object.assign	37,642,652 Ops/sec

Tests:

Using the spread operator
const obj = { sampleData: 'Hello world' } const finalObj = { ...obj, single: 'foo' };
Using Object.assign
const obj = { sampleData: 'Hello world' } const finalObj = Object.assign(obj, { single: 'foo' });