Run results for: Reflect.deleteProperty vs delete

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/132.0.0.0 Safari/537.36

Browser: Chrome 132

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

delete - 0 property

44.9M/s

Reflect.deleteProperty - 0 property

43.0M/s

delete - * property

33.7M/s

Reflect.deleteProperty - * property

30.9M/s

delete - 1 property

12.4M/s

Reflect.deleteProperty - 1 property

12.1M/s

View exact numbers

Test name	Executions per second
✓ delete - 0 property	44,860,668 Ops/sec
Reflect.deleteProperty - 0 property	42,964,760 Ops/sec
delete - * property	33,697,836 Ops/sec
Reflect.deleteProperty - * property	30,902,674 Ops/sec
delete - 1 property	12,436,452 Ops/sec
Reflect.deleteProperty - 1 property	12,083,300 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')