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

Run details:

User agent: Mozilla/5.0 (X11; CrOS x86_64 14541.0.0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/138.0.0.0 Safari/537.36

Browser: Chrome 138

Operating system: Chrome OS 14541.0.0

Device Platform: Desktop

Date tested: 8 months ago

Using Object.assign

12.1M/s

Using the spread operator

11.4M/s

View exact numbers

Test name	Executions per second
✓ Using Object.assign	12,107,943 Ops/sec
Using the spread operator	11,445,529 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);