var someBullshitFunction = function(){ console.log('wagwan!'); };

​

(function() {

  console.log('start of IIFE');

  /* crap loads of code where every new variable is declared using 'var' such as: */

  var myNumber = 4;

  var myFunction = function(){ console.log('formidable!'); };

  var myObject = { 

    anotherNumber : 1001, 

    anotherFunc : function(){ console.log('formidable!'); }

  };

  console.log('end of IIFE');

})();

​

someBullshitFunction();    // reachable, hence works: see in the console

myFunction();              // unreachable, will throw an error, see in the console

myObject.anotherFunc();    // unreachable, will throw an error, see in the console