Question

(function() {
    var theArg;
     google = function(arg) {
        theArg = arg;
        alert(theArg);
     }

     yahoo = function() {
       alert(theArg);
     }
})();

google("hello");   

I am not getting the alert in yahoo function. What i am missing here and what is going wrong.

Answer 1

Giving a quick example to the comments in the main question.

Script

(function(exports) {

    var theArg, google, yahoo;

    google = function(arg) {
        theArg = arg;
        alert(theArg);
    }

    yahoo = function() {
        alert(theArg);
    }

    exports.yahoo = yahoo; // This is now available to the window

})(window);

// This will set initial value of 
google("Hello World");

HTML Page

<!-- This should now alert Hello World! -->
<button onclick="yahoo()">Yahoo</button> 

In my experience if you call this without assigning to window it will not alert anything as the function will be undefined. As mentioned in comments, this is a scope issue.