Overload Navigator - Navigate on galleries with arrow keys

overload_navigator.js

// ==UserScript==
// @name         Overload Navigator
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  Navigate on galleries with arrow keys
// @author       ulisseslameida
// @match        http://overloadr.com.br/*
// @grant        none
// ==/UserScript==
/* jshint -W097 */
'use strict';

(function() {
    console.log("Overload Navigator v 0.1");
    var $ = jQuery;
    var slides = $('.slides').last();
    var right = 39;
    var prev = 37;
    
    console.log("Slides gallery found: " + slides.length);

    var activeSlide = function(slides) {
        return slides.find('.flex-active-slide').last();
    };

    var navigate = function(slide) {
        if (slide.length > 0) {
            slide.click();
        }
    };

    var nextSlide = function(event) {
        if(event.keyCode == right) {
            navigate(activeSlide(slides).next());
        }
    };

    var prevSlide = function(event) {
        if(event.keyCode == prev) {
            navigate(activeSlide(slides).prev());
        }
    };

    if(slides.length > 0) {
        $('body').keyup(nextSlide);
        $('body').keyup(prevSlide);
    }
})();