gistfile1.js

/* in few words:no round brackets=function or object, round brackets:anything, arguments.callee included.diff is the left assignment */

var a = function(){return 1}(); // 1
var b = function(){return {}}(); //object

function(){return 1}(); //error
function(){return {}}(); //error

var c = (function(){return arguments.callee})(); //function
var d = (function(){return []})(); //array

(function(){return 1})(); // 1
(function(){return {}})(); //object