gistfile1.js

// This...
  (function($) {
    $('body').css('background', 'red');
  })(jQuery)



// is the same as this...

  var myFunction = function($) {
    $('body').css('background', 'red');
  }

  myFunction(jQuery);
  

// is the same as this
  jQuery('body').css('background', 'red');