HakerRank tutorials 10DaysofJavascript Inheritance

Details.markdown

Link to problem Statement

Medium Article to understand the problem and the solution.

Below are two files:

• Problematic-code.js : This was the code that I had submitted but was not working.
• Solution.js : This is the actual working code that I have submitted.

Problematic-Code.js

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 = () => (this.w * this.h)

/*
 * 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);
}

Solution.js

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(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);
}