How can I make a method function inside a subclass inherit some properties

Trying to build a discord.js bot I ran into some mental gap. Let’s say I need my console application to be a puppy that does a trick and barks after that. So I would build a subclass for this in this fashion:

class MyPuppy extends Dog {

  constructor() {
    super({
      name: 'Fido'
    });
  }

  trick() {
    console.log(`- Gives paw -`);
  }

}

But this wouldn’t make the application to bark. For that I assume the trick() function would need to inherit some methods although I’m not an expert in Javascript. My intuition tells me that I would need to declare the parent class somewhat like this:

class Dog {

  constructor(props) {
    this.name = props.name;
    this.trick = () => {
      this.trick.prototype.bark = () => {
        console.log('Woof!')
      };
    };
  }

}

But as this isn’t working and I don’t know what else is necessary to implement this behavior, this has stopped me to continue learning Node.js. Would you have any advice on this application?

Answer

Have you tried invoking the bark method from within the trick method?

class Dog {
    constructor(props) {
        this.name = props.name;
    }

    bark() {
        console.log("Woof!");
    }
}

class MyPuppy extends Dog {
    constructor() {
        super({
            name: 'Fido'
        });
    }

    trick() {
        console.log(`- Gives paw -`);
        this.bark();
    }
}

const puppy = new MyPuppy()
puppy.trick()

Another way to look at this would be to add the default trick behaviour inside the parent class and then execute the parent’s trick method in all children’s trick methods.

class Dog {
    constructor(props) {
        this.name = props.name;
    }

    bark() {
        console.log("Woof!");
    }

    trick() {
        this.bark();
    }
}

class MyPuppy extends Dog {
    constructor() {
        super({
            name: 'Fido'
        });
    }

    trick() {
        console.log(`- Gives paw -`);
        super.trick();
    }
}

new MyPuppy().trick()