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

Run details:

User agent: Mozilla/5.0 (Linux; Android 9; SM-N950N Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/90.0.4430.232 Whale/1.0.0.0 Crosswalk/26.90.3.14 Mobile Safari/537.36 NAVER(inapp; search; 1000; 11.8.10)

Browser: Chrome 90

Operating system: Android

Device Platform: Mobile

Date tested: 2 years ago

Test name	Executions per second
Using the spread operator	494523.6 Ops/sec
Using Object.assign	1507159.0 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);

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

Using the spread operator

Using Object.assign