ES6 Classes & Constructors

What ES6 feature is demonstrated in this code?

class Animal {
  constructor(name) {
    this.name = name;
  }
  
  speak() {
    return `${this.name} makes a noise`;
  }
}

class Dog extends Animal {
  constructor(name, breed) {
    super(name);
    this.breed = breed;
  }
  
  speak() {
    return `${this.name} barks`;
  }
}

Polymorphism
Encapsulation
Class inheritance
This code demonstrates class inheritance in ES6: 1) The 'extends' keyword establishes inheritance between classes, 2) 'super()' calls the parent class constructor and must be called before using 'this' in the derived class constructor, 3) Methods can be overridden in derived classes, 4) Derived classes inherit all methods from the parent class, 5) The prototype chain is properly set up behind the scenes, 6) This provides a cleaner syntax for inheritance compared to pre-ES6 prototype manipulation.
Abstract classes

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