self executing function jquery vs javascript difference

Question

What are the difference among -

First :-

(function () {

    var Book = \'hello\';

}());

Second:-

Answer 1

As the other answers pointed out they are all self executing anonymous function or immediate anonymous functions.

The third example is use to create aliases for variables outside the function. This is a good way to prevent name conflicts and creating code where it's possible to easily change a module used in the function. It's essentially a form of dependency injection.

(function (doc, win, $, myModule) {
    // Code
}(document, window, jQuery, window.MYAPP.myModule));

doc, win, $ and myModule are injected variables. With this pattern it's trivial to change any of the injected components. Like this

(function (doc, win, $, myModule) {
    // Code
}(document, window, jQuery, window.MYAPP.myModule2)); //Use myModule2 instead myModule