Example JS Module pattern

gistfile1.js

var Header = (function(w,d,undefined)){
  
  var _elem = null;
  
  var bindButtons = function(){
    $(document).on('click', _elem.find(".js-toggle-sidebar"), function(){
      Sidebar.toggle(); //
    });
  }
  
  var init = function(){
    _elem = $("#header");
    bindButtons();
  }

  return {
    init: init
  }
  
})(window,document);

var Sidebar = (function(w,d,undefined){
  
  var _elem = null;
  
  var hide = function(){
    _elem.addClass('is-hidden');
  }
  
  var show = function(){
    _elem.removeClass('is-hidden')
  }
  
  var init = function(){
    _elem = $("#sidebar");
  }
  
  var toggleSidebar = function(){
    elem.hasClass('is-hidden') ? show()  hide();
  }
  
  // code for all other functions
  
  return {
    init: init,
    hide: hide,
    show: show,
    toggle: toggle
    // more here
  }
  
})(window,document);

window.onload = function(){
  Header.init();
  Sidebar.init();
}