app2.js

var main = function() {
    $('.dropdown-toggle').click(function() {
        $('.dropdown-menu').toggle();
    });
    
    $('.arrow-next').click(function(){
        var currentSlide = $('.active-slide');
        var nextSlide = currentSlide.next();
        var currentDot = $('.active-dot');
        var nextDot = currentDot.next();
        
        if(nextSlide.length == 0) {
            nextSlide = $('.slide').first();
        } 
        
        currentSlide.fadeOut(600).removeClass('active-slide');
        nextSlide.fadeIn(600).addClass('active-slide');
        currentDot.removeClass('active-dot');
        nextDot.addClass('active-dot');
    });
};

$(document).ready(main);