Run results for: JavaScript spread operator vs Object.assign performance to merge into new object

Run details:

User agent: Mozilla/5.0 (Linux; Android 11; SAMSUNG SM-A705FN) AppleWebKit/537.36 (KHTML, like Gecko) SamsungBrowser/23.0 Chrome/115.0.0.0 Mobile Safari/537.36

Browser: Chrome Mobile 115

Operating system: Android

Device Platform: Mobile

Date tested: 9 months ago

Test name	Executions per second
Using the spread operator	1140696.5 Ops/sec
Using Object.assign	2784539.0 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 to merge into new object

Using the spread operator

Using Object.assign