Responsive jQuery restaurant menu system

I have a working restaurant menu system - as the user selects a menu it slides into view. The build is responsive, and I've used the 'Debounced Resize() jQuery Plugin'. However, in implementing the responsive code, I feel my code has become clunky, and it needs refactoring.

The hope here is that I'll receive some constructive criticism and some pointers on how to improve my code, which will in turn grow my knowledge base.

HTML

    

        
            Menu Title 1
            Menu Title 2
            Menu Title 2
        

        
        

            Menu Title 1

            
                
                    

                        
                            
                        

                        
                            
                        

                        
                            
                        

                    
                
            

            

        

        

    

jQuery

```
$(window).smartresize(function () {

var $mmenu = $('.menu__main');

if ($mmenu.length > 0) {

var $mnav = $('.menu__nav'),
$mnav_a = $mnav.find('a'),
m = parseInt($mnav.outerHeight(true), 10),
$contain = $mmenu.closest('.menu-container'),
h = 0,
l = 0;

// check and store if .active element exists
var active = $mmenu.not(':first').is('.active');

// if it doesn't exists
if (!active) {
$mmenu.hide() // hide all
.removeClass('active') // remove the active class from any that have it
.first() // select the first only
.addClass('active') // give it the active class
.show(); // and show it

$mnav_a.eq(0).addClass('active');

$mmenu.each(function(z) {

var $this = $(this);

$this.css('height','auto');

$this.css({
zIndex: z+1,
position:

Some of your code is redundant. These two lines are mutually exclusive. Especially since you add "active" to the first menu item, which is the only one which would satisfy !active.

if (!active) {
            .removeClass('active') // remove the active class from any that have it

Makes me wonder if the "if (!active)" branch can be removed entirely.

Revised CodePen: http://codepen.io/anon/pen/FHfAi

StackExchange Code Review Q#47220, answer score: 3