CODEWITHSUNDEEP
javascript
Dot Support
Dot Support

Reputation: 25

Why doesn't the class have a getter key?

class Class3 {
  get service() {
    return 'service'
  }
}

const class3Instance = new Class3()
console.log(class3Instance.service)
console.log(class3Instance)
// 👆 clas3Instance had Semi transparent service

var descriptor = Object.getOwnPropertyDescriptor(class3Instance, 'service')
console.log(descriptor, "descriptor")
// 👆 undefined

I expected class3Instance has service property but it didn't.

Upvotes: 1

Views: 46

Answers (1)

CertainPerformance
CertainPerformance

Reputation: 371049

Just like any methods defined directly inside a class, it's a property on the prototype, not on the object itself. Check the descriptor of Class3.prototype, or of Object.getPrototypeOf(class3Instance):

class Class3 {
  get service() {
    return 'service'
  }
}
const class3Instance = new Class3()
var descriptor = Object.getOwnPropertyDescriptor(Class3.prototype,'service')
console.log(descriptor,"descriptor")

The class3Instance object does not have an own property of service - when class3Instance.service is accessed, the interpreter finds that property name on the internal prototype of class3Instance, not on class3Instance itself.

Upvotes: 2

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