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/103.0.5060.114 Safari/537.36 Edg/103.0.1264.49

Browser: Chrome 103

Operating system: Windows

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
delete - 1 property	10312084.0 Ops/sec
Reflect.deleteProperty - 1 property	3341309.5 Ops/sec
delete - * property	3579220.8 Ops/sec
Reflect.deleteProperty - * property	2099908.2 Ops/sec
delete - 0 property	6455420.5 Ops/sec
Reflect.deleteProperty - 0 property	2878215.0 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')