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

Run details:

User agent: Mozilla/5.0 (Android 13; Mobile; rv:136.0) Gecko/136.0 Firefox/136.0

Browser: Firefox Mobile 136

Operating system: Android

Device Platform: Mobile

Date tested: one year ago

Benchmark engine: Benchmark.js

Using the spread operator

7.4M/s

Using Object.assign

5.6M/s

View exact numbers

Test name	Executions per second
✓ Using the spread operator	7,391,874 Ops/sec
Using Object.assign	5,604,232 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 update = (first, ...args) => { return Object.assign({}, first, ...args) } const firstObject = { sampleData: 'Hello world' } const secondObject = { moreData: 'foo bar' } const finalObject = update(firstObject, secondObject);