// Create a new User object constructor
  function User( name, age ) {
      // Attempt to figure out the year that the users was born
      var year = (new Date()).getFullYear() – age;
  
      // Create a new Privileged method that has access to 
      // the year variable, but is still publically available
      this.getYearBorn = function(){
          return year;
      };
  }
  
  // Create a new instance of the user object
  var user = new User( "Bob", 44 );
  
  // Verify that the year returned is correct
  alert( user.getYearBorn() == 1962 );
  
  // And notice that we're not able to access the private year 
  // property of the object
  alert( user.year == null );