05-Inheritance.js

// Objective
// In this challenge, we practice implementing inheritance and use JavaScript prototypes to add a new method to an existing prototype. Check out the attached Classes tutorial to refresh what we've learned about these topics.
// Task
// We provide the implementation for a Rectangle class in the editor. Perform the following tasks:
// Add an area method to Rectangle's prototype.
// Create a Square class that satisfies the following:
// - It is a subclass of Rectangle.
// - It contains a constructor and no other methods.
// - It can use the Rectangle class' area method to print the area of a Square object.
// Locked code in the editor tests the class and method implementations and prints the area values to STDOUT.

class Rectangle {
  constructor(w, h) {
    this.w = w;
    this.h = h;
  }
}

/*
 *  Write code that adds an 'area' method to the Rectangle class' prototype
 */
Rectangle.prototype.area = function () {
  return this.w * this.h;
};

/*
 * Create a Square class that inherits from Rectangle and implement its class constructor
 */
class Square extends Rectangle {
  constructor(lenght) {
    super(lenght, lenght);
  }
}