Run results for: normal object vs mutated object

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/133.0.0.0 Safari/537.36

Browser: Chrome 133

Operating system: Linux

Device Platform: Desktop

Date tested: one year ago

mutated

3.4M/s

normal object

3.4M/s

View exact numbers

Test name	Executions per second
✓ mutated	3,417,934 Ops/sec
normal object	3,372,198 Ops/sec

HTML Preparation code:

<!--your preparation HTML code goes here-->

Script Preparation code:

'use strict';
class a {a=3;b(){blur()}}
class b {a=3;b(){blur()}}
let obj1 = new a
let obj2 = new a
Reflect.setPrototypeOf(obj2, b.prototype)

Tests:

normal object
obj1.a = 2 obj1.a delete obj1.a obj1.b() 'a'in obj1 Object.defineProperty(obj1,'a',{value:2})
mutated
obj2.a = 2 obj2.a delete obj2.a obj2.b() 'a'in obj2 Object.defineProperty(obj2,'a',{value:2})