what is self-executing anonymous function or what is this code doing?

Question

var module = {};


(function(exports){

  exports.notGlobalFunction = function() {
    console.log(\'I am not global\');
  };  

}(module));

function notGlobalFunct         


        

Answer 1

"self-executing" might be misleading. It is an anonymous function expression, that is not assigned or or given as an argument to something, but that called. Read here on Immediately-Invoked Function Expression (IIFE).

what is var module = {} doing?

It initializes an empty object that is acting as a namespace.

why is it called again inside the fist function?

It is not "called", and not "inside" the first function. The object is given as an argument ("exports") to the IEFE, and inside there is a property assigned to it.