Does "data property" have "access property" internally in javascript?

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I understood that there are two types of property in object, data property and access property.

And we can access to "data property" without "access property" like this:

const person = {
  name: 'Pecan'
};

console.log(person.name) // getting name data property
person.name = 'Pie' // setting name data property

And I guess, when data property has created, access property has created internally with the "name" like this:

const person = {
  name: 'Pecan',

  get name() {
    return this.name;
  },
  set name(name) {
    this.name = name;
  }
}

Am I right?

node.js properties javascript
1 Answers

And I guess, when data property has created, access property has created internally

No, you're not right. A data property does not contain a getter/setter. And an accessor property does not contain a space to store a value. It's either one or the other, it's not like data properties are a layer over accessor properties or the other way round.

It might help to use Object.getOwnPropertyDescriptor to see what the two different ways of writing that object literal generate:

const personData = {
  name: 'Pecan',
}

let personAccessorName = 'Pecan';
const personAccessor = {
  get name() {
    return personAccessorName ;
  },
  set name(name) {
    personAccessorName = name;
  }
};

console.log('data property', Object.getOwnPropertyDescriptor(personData, 'name'));
console.log('accessor property', Object.getOwnPropertyDescriptor(personAccessor, 'name'));
div.as-console-wrapper { max-height: 100%; }

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