Question

 (function(){
   var a = function () {
     alert("hey now!! ");
   };
   return {"hi":function(){return a;}};
 })();

 hi();

This code doesn’ t work. How do i expose a function??

Answer 1

The self invoking function returns an object with the property hi, this object is not added to the global scope so that you can use the property directly. Put the result of the function in a variable:

var o =
(function(){

  var a = function (){
    alert("hey now!! ");
  };

  return {"hi":function(){return a;}};

})();

Using the property to call the function will only return the function contained in the variable a, so you have to call the return value from the function to call the function that contains the alert:

o.hi()();

Demo: http://jsfiddle.net/Guffa/9twaH/