Run results for: key assignment vs spread operator

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/137.0.0.0 Safari/537.36 Edg/137.0.0.0

Browser: Chrome 137

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Benchmark engine: Benchmark.js

Key assignment

311/s

Spread operator

306/s

View exact numbers

Test name	Executions per second
✓ Key assignment	311 Ops/sec
Spread operator	306 Ops/sec

Tests:

Spread operator
let obj = {} for(i=0; i<100000; i++){ obj[i] = true } let newObj = { ...obj, foo: 'bar' }
Key assignment
let obj = {} for(i=0; i<100000; i++){ obj[i] = true } obj.foo = 'bar'