add a setter to a subclass in javascript

To add a setter to a subclass in JavaScript, you can define a setter method on the prototype of the subclass. This setter method will be called every time the corresponding property of an instance of the subclass is set.

Here's an example:

index.tsx
class Animal { }

class Cat extends Animal {
  constructor(name) {
    super();
    this._name = name;
  }

  get name() {
    return this._name;
  }

  set name(value) {
    this._name = value;
  }
}

const myCat = new Cat("Whiskers");
console.log(myCat.name); // "Whiskers"

myCat.name = "Fluffy";
console.log(myCat.name); // "Fluffy"
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In this example, we define a subclass Cat that extends the base class Animal. The constructor of Cat takes a name parameter and sets it to a private property _name.

We define a getter and a setter for the name property on the prototype of Cat. The getter simply returns the value of _name, while the setter sets the value of _name to the new value.

We then create an instance of Cat with the name "Whiskers", and log its name to the console. We then set the name of the cat to "Fluffy" using the setter, and log its new name to the console.