javascript scoping - 2

gistfile1.js

/* #########################
 2 - SCOPE - CLOSURES
 hide from global by using a closure 
*/
(function(n){ // param

  var myURL = 'google.com';

  _log( n === 4 ) //  true

  function b2(){
    var c = 'foo';
  }

})(4); // argument

_log( window.myURL ) // undefined
_log( window.b2 )    // undefined
_log( window.c )     // undefined