prototype_example.js

var car = function() {
  this.wheel = true; 
  this.seats = true; 
}

var ferrarri = function() {
  this.carType = "fast car";
}

// inherits
ferrarri.prototype = new car();

// whenever we create an instance of ferrarri, the new object will contain car's properties.
var jackCar = new ferrarri();

jackCar.wheel; // true; 
jackCar.seats; // true;

// to figure out ferrarri's parent 
jackCar.__proto__  // car {wheel: true, seats: true}

// defining a new method for object
ferrarri.prototype.getName = function() { return "ferrari"; }

// create new instance 
var newCar = new ferrarri();

// returns ferrarri //
newCar.getName()