Run results for: Object.defineProperty vs assignment

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/92.0.4515.131 Safari/537.36

Browser: Chrome 92

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
defineProperty	2313416.8 Ops/sec
assignment	8212175.0 Ops/sec

Script Preparation code:

window.A = class A {
    constructor () {
      Object.defineProperty(this, 'a', {value: 'a'})
    }
}

window.B = class B {
    constructor () {
      this.a = 'a'
    }
}

Tests:

defineProperty
new A()
assignment
new B()