JS Module mode

//Create an anonymous function expression that is called immediately
//Return a variable in which the variable contains what you want to expose
//The returned variable will be assigned to counter, not the function itself declared outside.

var counter = (function () {
var i = 0;

return {

             Getfunction () {
return i;

               },

               SetFunction (val) {

                i = Val;

                },

                Incrementfunction () {
return ++i; 

                   } 

                   }; 

                   } ()); 

// counter is an object with multiple attributes, the code above is actually a method of Span style= "color: #008000;" > 


                      Counter.get (); // 0 

                         Counter.set (3 ); 

                         Counter.increment (); // 4 

                            Counter.increment (); // 5 


                               Counter.i ; // undefined because I is not the property of the returned object  

                               I; // reference error: I has no definition (because I only exist in closures)      

JS Module mode