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/123.0.0.0 Safari/537.36

Browser: Chrome 123

Operating system: Windows

Device Platform: Desktop

Date tested: 2 years ago

delete - 0 property

7.2M/s

delete - * property

4.1M/s

Reflect.deleteProperty - 0 property

3.8M/s

delete - 1 property

3.7M/s

Reflect.deleteProperty - 1 property

2.3M/s

Reflect.deleteProperty - * property

2.2M/s

View exact numbers

Test name	Executions per second
✓ delete - 0 property	7,206,114 Ops/sec
delete - * property	4,141,015 Ops/sec
Reflect.deleteProperty - 0 property	3,757,957 Ops/sec
delete - 1 property	3,661,060 Ops/sec
Reflect.deleteProperty - 1 property	2,340,157 Ops/sec
Reflect.deleteProperty - * property	2,232,249 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')