Run results for: Reflect.deleteProperty vs delete

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:137.0) Gecko/20100101 Firefox/137.0

Browser: Firefox 137

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

delete - 0 property

49.3M/s

Reflect.deleteProperty - 0 property

37.6M/s

delete - * property

24.3M/s

Reflect.deleteProperty - * property

23.8M/s

delete - 1 property

23.3M/s

Reflect.deleteProperty - 1 property

16.7M/s

View exact numbers

Test name	Executions per second
✓ delete - 0 property	49,289,660 Ops/sec
Reflect.deleteProperty - 0 property	37,568,308 Ops/sec
delete - * property	24,258,724 Ops/sec
Reflect.deleteProperty - * property	23,775,418 Ops/sec
delete - 1 property	23,327,238 Ops/sec
Reflect.deleteProperty - 1 property	16,669,977 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')