Why parentheses around nested JS functions?

Question

JavaScript

Let's say there is a function, it has two nested ones:

function test() { 
  (function first($)
    { ...
                })		
  ((function second(r) {
    ...
                function in_second() { 
      }
    return $; 
    })
  }

Why are nested functions enclosed in round brackets?
(If some method is called later, it is clear why. And if it is not called?)

Answer 1

I agree with Alexey Ten. You seem to have removed the extra parentheses.
Based on what's left and your question, I suspect you're interested in constructs like

(function(){
  // some code here
})();

This is the so-called. immediately invoked functions . Code within such a function will be immediately executed within its own variable scope.