self executing function jquery vs javascript difference

Question

What are the difference among -

First :-

(function () {

    var Book = \'hello\';

}());

Second:-

Answer 1

All of these are example of self invoking function.

This will give you a clear view:-

var my_func = function(){
    var internal_var = "Hello";
    return internal_var;
};

var my_func2 = function(name){
    var internal_var = "Hello";
    return internal_var;
};

var long_var_name = "I can be some object or number or object or array";

var result1 = (my_func());
var result2 = (my_func)();
var result3 = (my_func2)(long_var_name);

console.log(result1, result2, result3);

Using this example you can compare it with the First, Second and Third method.