Day 5: Inheritance (10 Days of Javascript)

Task:

We provide the implementation for a Rectangle class in the editor. Perform the following tasks:

1. Add an area method to Rectangle‘s prototype.
2. 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.

---

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.h*this.w;
 }

/*
 * Create a Square class that inherits from Rectangle and implement its class constructor
 */

class Square extends Rectangle{
    constructor(side){
        super(side,side);
    }
}

if (JSON.stringify(Object.getOwnPropertyNames(Square.prototype)) === JSON.stringify([ 'constructor' ])) {
    const rec = new Rectangle(3, 4);
    const sqr = new Square(3);
    
    console.log(rec.area());
    console.log(sqr.area());
} else {
    console.log(-1);
    console.log(-1);
}