How do I create an abstract base class in JavaScript?

Question

Is it possible to simulate abstract base class in JavaScript? What is the most elegant way to do it?

Say, I want to do something like: -

var cat = ne         


        

Answer 1

Reference: https://developer.mozilla.org/pl/docs/Web/JavaScript/Reference/Classes

class Animal {
  
  constructor(sound) {
    this.sound = sound;
      }

  say() {
    return `This animal does ${this.sound}`;}

};

const dog = new Animal('bark');
console.log(dog.say());