Question

var GlobalObject = (function(){

    var arr1 = [];
    var arr2 = [];
    var arr3 = [];
    var arr4 = []; 

        return {

         }

})();

1. Now how would i call GlobalObject.arr1 across the application?
2. Will it maintain its reference and value, when i do a push and pop.
3. Will this cause any memory leak

Answer 1

arr1 is defined only within the scope of the GlobalObject function. If you want to access it globally, you need to have the GlobalObject function return a reference to it. Read up on functional scope in javascript for a better understanding of this. Currently your function returns an empty object. You want to do something like this:

...
return {
   "array1": arr1,
   "array2": arr2,
   "array3": arr3,
   "array4": arr4
};

(though you can maintain the privacy of those arrays by not returning them)

The GlobalObject will maintain arr1‘s reference and value until you manually de-reference it (setting it to null). Javascript’s garbage collector only deletes objects that aren’t needed anymore.

Your current code shows no memory leaks. Watch out for circular references and closures.