What is the difference between these 2 JavaScript declarations?

Question

For one of them the \"()\" is inside, for the other one it is outside. Here they are:

var a = (function() {
    return {
        bla: function(         


        

Answer 1

the ending brackets mean that : When a function is to be invoked immediately, the entire invocation expression should be wrapped in parens so that it is clear that the value being produced is the result of the function and not the function itself. (taken from here)

So, if you use {}(), the function is immediately executed and the variable is assigned with the function result.

Then if you use ({})(), if there's a function between (), it is executed and the value is assigned to the variable.

They are the same thing if they contain the same functions in my opinion.