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/129.0.0.0 Safari/537.36

Browser: Chrome 129

Operating system: Linux

Device Platform: Desktop

Date tested: one year ago

delete - 0 property

21.3M/s

delete - 1 property

13.8M/s

delete - * property

11.8M/s

Reflect.deleteProperty - 0 property

9.0M/s

Reflect.deleteProperty - 1 property

8.0M/s

Reflect.deleteProperty - * property

6.4M/s

View exact numbers

Test name	Executions per second
✓ delete - 0 property	21,276,112 Ops/sec
delete - 1 property	13,836,089 Ops/sec
delete - * property	11,759,961 Ops/sec
Reflect.deleteProperty - 0 property	8,980,098 Ops/sec
Reflect.deleteProperty - 1 property	8,042,298 Ops/sec
Reflect.deleteProperty - * property	6,411,388 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')