gistfile1.js

// Set up global May Day object (md) to attach functions to
var md = md || {};

(function($, md) {
  // dollar sign ($) == jQuery
  
  // Can add new functions to the jQuery prototype
  $.fn.newFunction = function() {
    return true;
  }
  
  // Can add functions to the global May Day object to be used later
  md.helloWorld = function() {
    return 'Hello World';
  }
  
  // Can also attach properties to the May Day object
  md.senators = {
    California: ['Boxer', 'Feinstein'],
  };
  
  // 
  $('#derp').on('click', function() {
    var text = md.helloWorld;
    console.log(text);
  });
  
  $.ready(function() {
    alert('All systems are go');
  });

})(jQuery, md);

// Mayday object is accessible outside of the module!
var hello = md.helloWorld();

if (md.senators.California[0] == 'Boxer') {
  console.log('huzzah!');
}