function Car() {

           /* private static variables */
           (function() {
               var static = 5;
               Car.prototype,staticMethod = function() {
                    return static;
               };
           });

           /* private instance variables */
           var parts = [];

           /* privileged methods*/
           this.getCars = function(){
               return strings;
           }

       }

       Car.prototype.pop = function() {
            return this.getCars().pop();
       }

       Car.prototype.push = function(elem) {
            this.getCars().push(elem);
       }