self executing function jquery vs javascript difference

Question

What are the difference among -

First :-

(function () {

    var Book = \'hello\';

}());

Second:-

Answer 1

In fact, all three are self executing function's and ti really depends on what you are needing to do.

The only difference between is between 3. 1 and 2 are the same.

The difference with 3 is that you are passing a reference to jquery as an argument. Now all functions inside this annoyomus function have access to jque