Run results for: Reflect.deleteProperty vs delete

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/130.0.0.0 Safari/537.36

Browser: Chrome 130

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

delete - 1 property

17.7M/s

delete - 0 property

17.0M/s

Reflect.deleteProperty - 1 property

9.4M/s

Reflect.deleteProperty - 0 property

9.3M/s

delete - * property

9.2M/s

Reflect.deleteProperty - * property

6.5M/s

View exact numbers

Test name	Executions per second
✓ delete - 1 property	17,650,328 Ops/sec
delete - 0 property	16,962,942 Ops/sec
Reflect.deleteProperty - 1 property	9,427,557 Ops/sec
Reflect.deleteProperty - 0 property	9,331,428 Ops/sec
delete - * property	9,234,743 Ops/sec
Reflect.deleteProperty - * property	6,537,796 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')