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

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/126.0.0.0 YaBrowser/24.7.0.0 Safari/537.36

Browser: Yandex Browser 24

Operating system: Windows

Device Platform: Desktop

Date tested: 3 months ago

Test name	Executions per second
Using the spread operator	16492294.0 Ops/sec
Using Object.assign	5591486.0 Ops/sec
Using Object.assign with into empty object	4944587.0 Ops/sec

Tests:

Using the spread operator
const firstObject = { sampleData: 'Hello world' } const secondObject = { moreData: 'foo bar', sampleData: 'baz' } const finalObject = { ...firstObject, ...secondObject };
Using Object.assign
const firstObject = { sampleData: 'Hello world' } const secondObject = { moreData: 'foo bar', sampleData: 'baz' } const finalObject = Object.assign(firstObject, secondObject);
Using Object.assign with into empty object
const firstObject = { sampleData: 'Hello world' } const secondObject = { moreData: 'foo bar', sampleData: 'baz' } const finalObject = Object.assign({}, firstObject, secondObject);