con.js

function car() {
  return {
    start: function() {
      console.log("Engine on.");
    },
    accelerate: function() {
      console.log("Let's go!");
    }
  };
}
 
function roadster(brand) {
  var brand = brand;
  var baseCar = car();
 
  return {
    start: function() {
      return baseCar.start();
    },
    accelerate: function() {
      return baseCar.accelerate();
    },
    setBrand: function(name) {
      brand = name;
    },
    getBrand: function() {
      console.log(brand);
    }
  };
}
 
var myCar = roadster("Porsche")
myCar.start()            // "Engine on."
myCar.getBrand()         // "Porsche"
myCar.setBrand("Jaguar")
myCar.getBrand()         // "Jaguar"