var Person = (function() {
 var privates = {}; //obiekt, w ktorym bedziemy trzymac prywatne zmienne wszystkich obiektow
 
 var Person = function (name) {
  this.name = name; //publiczna wlasnosc
  this.key = Math.random();
  privates[this.key]  = {
   salary: NaN
  };
 };
 
 var throwIfNoPermission = function(that) {
  if (Object.getPrototypeOf(that) !== Person.prototype) {
   throw new TypeError();
  }
 };
 
 Person.prototype.getSalary = function() {
  throwIfNoPermission(this);
  return privates[this.key].salary;
 };
 
 Person.prototype.setSalary = function(salary) {
  throwIfNoPermission(this);
  privates[this.key].salary = salary;
 };
 
 return Person;
}());

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