Run results for: Reflect.deleteProperty vs delete

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36

Browser: Chrome 120

Operating system: Linux

Device Platform: Desktop

Date tested: 2 years ago

delete - 0 property

15.7M/s

delete - 1 property

14.8M/s

delete - * property

8.1M/s

Reflect.deleteProperty - 0 property

6.5M/s

Reflect.deleteProperty - 1 property

6.3M/s

Reflect.deleteProperty - * property

4.8M/s

View exact numbers

Test name	Executions per second
✓ delete - 0 property	15,716,495 Ops/sec
delete - 1 property	14,804,732 Ops/sec
delete - * property	8,099,550 Ops/sec
Reflect.deleteProperty - 0 property	6,491,935 Ops/sec
Reflect.deleteProperty - 1 property	6,268,074 Ops/sec
Reflect.deleteProperty - * property	4,836,092 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')