stateful-zombie.js

 var zombieOne = (function(){
    //private variables
      var firstName = "";
      var lastName = "";
    //private functions
      function init(data){
         firstName = data.firstName;
         lastName = data.lastName;
      }
      
      function combineName(){
         return firstName + " " + lastName;
      }
  
      function gerunding(action){
        return firstName + " " + lastName + " " + "is" + " " + action;
      }
      
    //public functions
      return {    
        getName: function(){
          return combineName();
        },
        setName: function(data){
          return init(data);
        },
        setAction: function(action){
          return gerunding(action);
        }
     };     
 })();
    
var data = {firstName: "George", lastName: "Rooney" };
  
zombieOne.setName(data);
zombieOne.getName(); // "George Rooney"
zombieOne.setAction("walking");// "George Rooney is walking"