Run results for: Delete vs destructure for objects without mutating

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 17_3 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) CriOS/122.0.6261.89 Mobile/15E148 Safari/604.1

Browser: Chrome Mobile iOS 122

Operating system: iOS 17.3

Device Platform: Mobile

Date tested: 2 years ago

Rest object

14.7M/s

delete - spread operator

10.9M/s

delete - assign

8.1M/s

delete - JSON.stringify

4.2M/s

View exact numbers

Test name	Executions per second
✓ Rest object	14,659,681 Ops/sec
delete - spread operator	10,908,230 Ops/sec
delete - assign	8,138,422 Ops/sec
delete - JSON.stringify	4,179,073 Ops/sec

Script Preparation code:

var obj = {
  a:1,
  b:2,
  c:3
}

Tests:

delete - assign
const copy = Object.assign({}, obj); delete obj.a
Rest object
const { a, ...rest } = obj;
delete - spread operator
const copy = { ...obj } delete obj.a
delete - JSON.stringify
const copy = JSON.parse(JSON.stringify(obj)); delete obj.a

Run results for: Delete vs destructure for objects without mutating

Measure the performance of delete versus removing a prop from an object without mutating

delete - assign

Rest object

delete - spread operator

delete - JSON.stringify