gistfile1.txt

var Car = function(make, color){
  this.make  = make;
  this.color = color;
};

function logCar(c){
  console.log("I'm a " + c.color + " " + c.make);
}

Car.prototype.log = function(){
  logCar(this);
};

logCar({ color: 'blue', make: 'BMW' });

(new Car('Ferrari', 'red')).log();