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// example of self execution module that allows fpr method chaining.

var obj = (function(val){
	 var i = 0;
   //private
   var add = function(val){
  	i += val;
    return this // need this for chaining
  }; 
  //private
   var subtract = function(val){
    i -= val;
    return this // need this for chaining
  };
  // private
   var print = function(){
   	console.log(i); 
     return this; // need this for chaining
   }
   
   return { // makes these public
   	add: add,
    subtract:subtract,
    print: print
   }
  
})();

obj.add(7).print().subtract(2).print();
console.dir(obj);