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

Run details:

User agent: Mozilla/5.0 (Linux; arm_64; Android 11; SM-G770F) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/90.0.4430.216 YaBrowser/21.5.3.120.00 SA/3 Mobile Safari/537.36

Browser: Yandex Browser 21

Operating system: Android

Device Platform: Mobile

Date tested: 2 years ago

Test name	Executions per second
Using the spread operator	1484589.0 Ops/sec
Using Object.assign	3845038.0 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