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

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 14_6 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/15E148 YaBrowser/19.5.2.38.10 YaApp_iOS/70.00 YaApp_iOS_Browser/70.00 Safari/604.1 SA/3

Browser: Yandex Browser 19

Operating system: iOS 14.6

Device Platform: Mobile

Date tested: 2 years ago

Test name	Executions per second
Using the spread operator	12496240.0 Ops/sec
Using Object.assign	6919200.0 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