In the first function, which is a function expression,  test.init();  is not working.

2. var test = function(){
3.   
4.   console.log("variable inside test");
5.   
6.   // This is a function inside another function (closure)
7.   var init = function(){
8.     console.log("variable inside init");
9.   }
10.   // returning an instance of init method will expose it to the closure.
11.   return{
12.     init:init
13.   }
14.   
15. }
16. 
    
17. test().init(); // working
    test.init();   // not working - WHY?

But in the following function, which is an IIFE  test.init();  is working.

2. var test = (function(){
3.   
4.   console.log("variable inside test");
5.   
6.   // This is a function inside another function (closure)
7.   var init = function(){
8.     console.log("variable inside init");
9.   }
10.   
11.   return{
12.     init:init
13.   }
14.   
15. })();
16. 
    
17. test.init(); // working
    test().init(); // not working - WHY?

Why  test.init();  is not working in the first example but is working in the second example??

Thanks