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

Run details:

User agent: Mozilla/5.0 (Android 15; Mobile; rv:132.0) Gecko/132.0 Firefox/132.0

Browser: Firefox Mobile 132

Operating system: Android

Device Platform: Mobile

Date tested: one year ago

Using Object.assign

16.2M/s

Using the spread operator

9.1M/s

View exact numbers

Test name	Executions per second
✓ Using Object.assign	16,217,196 Ops/sec
Using the spread operator	9,088,768 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);