Вывести переменную внутри объекта

var Person = function(firstAndLast) { 
  var fullName = firstAndLast; 
  this.getFullName = function() { 
    return fullName; 
  }; 
  return firstAndLast; 
}; 
 
var bob = new Person('Bob Ross'); 
console.log(bob.getFullName());