gistfile1.js

// closure pattern
( function( window, document, undefined ) {
    console.log('Hello world!');
})( this,this.document );

// single-lettered minified version
(function(w,d,u){console.log('Hello world!');})(this,this.document);

// self executing anonymous function
(function(){})()
                 
// bypassing a var declaration at the top and `this` is always the global object when in global scope
(function(myname){})('paul')

// switch up the args passed in on all ready functions
( function( oReady ) {
    $.fn.ready = function( fn ) {
        return oReady.call( this, function() { fn.call( this, $, window, document ); });
    };
})( $.fn.ready );
 
// which enables
$(function($,window,document,undefined){ alert(document) })