// Create Constructor function for Shape
function Shape(name){
    // Define private variable by using 'var' keyword
    // The variable _name will not be accessible outside
    var _name= name; // assign argument to variable _name 
    // Create property getName using `this` and assign it to function
    // to return private variable _name
    this.getName = ()=>{
        return _name;
    }
}
// Create Constructor Function for Rectangle which is derived from Shape
function Rectangle (name, side1, side2){
    // Define properties for parent Constructor function
    Shape.call(this, name);
    // Define public properties for Rectangle Constructor Function
    this.side1 = side1;
    this.side2 = side2;
    
    // Define method getArea
    this.getArea = ()=>{
        return this.side1 * this.side2;
    }
    // Define method isSquare
    this.isSquare = ()=>{
        return this.side1 === this.side2;
    }
}
// Inherit prototype property 
Rectangle.prototype = Object.create(Shape.prototype);
Rectangle.prototype.constructor = Rectangle;
var obj = new Rectangle('Rectangle', 3, 4); // create Rectangle object 
console.log(obj.name, obj.side1, obj.side2);
console.log("obj getName method:",obj.getName());
console.log("obj isSquare method:",obj.isSquare());
console.log("obj getArea method:",obj.getArea());