Run results for: Reflect.deleteProperty vs delete

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:109.0) Gecko/20100101 Firefox/119.0

Browser: Firefox 119

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Reflect.deleteProperty - 0 property

54.8M/s

delete - 0 property

46.9M/s

Reflect.deleteProperty - * property

46.8M/s

delete - * property

38.8M/s

delete - 1 property

23.4M/s

Reflect.deleteProperty - 1 property

22.3M/s

View exact numbers

Test name	Executions per second
✓ Reflect.deleteProperty - 0 property	54,783,404 Ops/sec
delete - 0 property	46,920,808 Ops/sec
Reflect.deleteProperty - * property	46,786,724 Ops/sec
delete - * property	38,791,752 Ops/sec
delete - 1 property	23,365,924 Ops/sec
Reflect.deleteProperty - 1 property	22,334,202 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')