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

Run details:

User agent: Mozilla/5.0 (Android 16; Mobile; rv:146.0) Gecko/146.0 Firefox/146.0

Browser: Firefox Mobile 146

Operating system: Android

Device Platform: Mobile

Date tested: 6 months ago

Using Object.assign

14.5M/s

Using the spread operator

7.6M/s

View exact numbers

Test name	Executions per second
✓ Using Object.assign	14,529,415 Ops/sec
Using the spread operator	7,619,588 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);