jQuery - Adds scroll direction to scroll event

jquery.scrolldirection.js

(function ($) {
    "use strict";

    var wnd = $(window),
        lastScrollTop = wnd.scrollTop(),
        lastScrollLeft = wnd.scrollLeft();

    wnd.on("scroll", function (event) {
        var scrollTop = wnd.scrollTop(),
            scrollLeft = wnd.scrollLeft(),
            direction = "";

        if (scrollTop > lastScrollTop) {
            direction += "south";
        } else if (scrollTop < lastScrollTop) {
            direction += "north";
        }

        if (scrollLeft > lastScrollLeft) {
            direction += "east";
        } else if (scrollLeft < lastScrollLeft) {
            direction += "west";
        }

        lastScrollTop = scrollTop;
        lastScrollLeft = scrollLeft;

        event.direction = direction;
    });
}(jQuery));

$(window).scroll(function (e) {
    if (-1 !== $.inArray(e.direction, ["south", "southeast", "southwest"])) {
        console.log("Going down");
    }
});