Explain the following JavaScript statement? [duplicate]

_x000D_ _x000D_ _x000D_ This question already has an answer here:_x000D_ _x000D_ _x000D_ How do JavaScript closures work?_x000D_ _x000D_ 86 answers_x000D_ _x000D_ _x000D_ _x000D_ Why do you need to invoke an anonymous function on the same line?_x000D_ _x000D_ 19 answers_x000D_ _x000D_ _x000D_ _x000D_ _x000D_ var ninja = (function(){ function Ninja(){}; return new Ninja(); })(); Why is the function above encapsulated in parentheses and why is there a (); at the end? I think it's a constructor function because of the (); at the end, but why is the object wrapped in parentheses?