Run results for: Reflect.deleteProperty vs delete

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 16_6 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/16.6 Mobile/15E148 Safari/604.1

Browser: Mobile Safari 16

Operating system: iOS 16.6

Device Platform: Mobile

Date tested: one year ago

delete - 0 property

65.5M/s

Reflect.deleteProperty - 0 property

57.6M/s

delete - * property

50.8M/s

Reflect.deleteProperty - * property

46.1M/s

delete - 1 property

19.0M/s

Reflect.deleteProperty - 1 property

18.6M/s

View exact numbers

Test name	Executions per second
✓ delete - 0 property	65,489,452 Ops/sec
Reflect.deleteProperty - 0 property	57,640,464 Ops/sec
delete - * property	50,792,252 Ops/sec
Reflect.deleteProperty - * property	46,117,600 Ops/sec
delete - 1 property	19,044,686 Ops/sec
Reflect.deleteProperty - 1 property	18,566,842 Ops/sec

Script Preparation code:

var many = {}
for (let i = 0; i < 100000; i++) many[i] = i

Tests:

delete - 1 property
var obj = { a: 1 } delete obj.a
Reflect.deleteProperty - 1 property
var obj = { a: 1 } Reflect.deleteProperty(obj, 'a')
delete - * property
delete many[50000] many[50000] = 50000
Reflect.deleteProperty - * property
Reflect.deleteProperty(many, 50000) many[50000] = 50000
delete - 0 property
delete many['x']
Reflect.deleteProperty - 0 property
Reflect.deleteProperty(many, 'x')