Inheritance

The inheritance is useful for code reusability purposes as it extends existing properties and methods of a class. The extends keyword is used to create a class inheritance.

class Car {
  constructor(brand) {
    this.carname = brand;
  }
  present() {
    return 'I have a ' + this.carname;
  }
}

class Model extends Car {
  constructor(brand, mod) {
    super(brand);
    this.model = mod;
  }
  show() {
    return this.present() + ', it is a ' + this.model;
  }
}

let myCar = new Model("Toyota", "Camry");
console.log(myCar.show()); // I have a Camry, it is a Toyota.

The super method is used inside a constructor and refers to the parent class. With this, one can access the parent class properties and methods. In the example above we use super(brand) in the Model subclass so it can get that Car superclasses properties.