Explain the encapsulated anonymous function syntax

Question

Summary

Can you explain the reasoning behind the syntax for encapsulated anonymous functions in JavaScript? Why does this work: (function(){})(); but

Answer 1

Those extra parenthesis creates extra anonymous functions between global namespace and anonymous function that contains the code. And in Javascript functions declared inside other functions can only access namespace of parent function that contains them. As there is extra object (anonymious function) between global scope and actual code scoping is not retained.