Run results for: Delete vs destructure for objects without mutating

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 17_5 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) EdgiOS/127.0.2651.81 Version/17.0 Mobile/15E148 Safari/604.1

Browser: Mobile Safari 17

Operating system: iOS 17.5

Device Platform: Mobile

Date tested: one year ago

Rest object

13.9M/s

delete - spread operator

9.5M/s

delete - assign

6.3M/s

delete - JSON.stringify

3.4M/s

View exact numbers

Test name	Executions per second
✓ Rest object	13,938,698 Ops/sec
delete - spread operator	9,548,236 Ops/sec
delete - assign	6,326,450 Ops/sec
delete - JSON.stringify	3,407,674 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