Showing Inheritance using Object.create and `new` Operator

Object.create.js

// Shape - superclass
function Shape() {
  this.x = 0;
  this.y = 0;
}

// Superclass method
Shape.prototype.move = function(x, y) {
  this.x += x;
  this.y += y;
  console.info('Shape moved.');
};

// Rectangle - subclass
function Rectangle() {
  // If we use new Shape()  then properties are assigned in __proto__
  // and still eveything will work.So no need to call Shape.call(this).
  // But if we use Object.create(Shape.prototype) then properties x & y are not copied so
  // we need to call Shape.call(this).
  Shape.call(this); // call super constructor.
}

// subclass extends superclass
//Rectangle.prototype = new Shape(); //  <-- This line doesn't require Shape.call(this);
Rectangle.prototype = Object.create(Shape.prototype);
Rectangle.prototype.constructor = Rectangle;

var rect = new Rectangle();

// Do notice rect in console for right understanding.
var rect = new Rectangle();
console.log(rect);
console.log(rect.move(1,2));

Some Links that I found useful :

JS Bits
A drip of JavaScript

Object.assign