Run results for: JavaScript Object.assign() vs object spread operator

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/136.0.0.0 Safari/537.36

Browser: Chrome 136

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Benchmark engine: Benchmark.js

Using the spread operator

45.5M/s

Using Object.assign

9.4M/s

View exact numbers

Test name	Executions per second
✓ Using the spread operator	45,529,972 Ops/sec
Using Object.assign	9,403,204 Ops/sec

Tests:

Using the spread operator
const evt = { name: 'Test Object', amount: 1234 } const obj1 = { ...evt, section: 'zxcv', subsection: '123' } const obj2 = { ...evt, section: 'asdf', subsection: 'qwer' }
Using Object.assign
const evt = { name: 'Test Object', amount: 1234 } const obj1 = Object.assign({}, evt, { section: 'zxcv', subsection: '123' }) const obj2 = Object.assign({}, evt, { section: 'asdf', subsection: 'qwer' })