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

Run details:

User agent: Mozilla/5.0 (Macintosh, Intel Mac OS X 10_11_4) AppleWebKit/602.1.28+ (KHTML, like Gecko) Version/9.1 Safari/601.5.17

Browser: Safari 9

Operating system: Mac OS X 10.11.4

Device Platform: Desktop

Date tested: 2 years ago

Using the spread operator

336K/s

Using Object.assign

186K/s

View exact numbers

Test name	Executions per second
✓ Using the spread operator	336,073 Ops/sec
Using Object.assign	186,457 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);