Check up or down scrolls using JQUERY

Check up or down scrolls

  //Check up or down scrolls
  function isScrollTopOrDown(){
    var lastScrollTop = 0, delta = 5;
    $(window).scroll(function(){
      var nowScrollTop = $(this).scrollTop();
      if(Math.abs(lastScrollTop - nowScrollTop) >= delta){
        if (nowScrollTop > lastScrollTop){
          if(debug){
            // console.log('Scrolling Down');
            // console.log(isElementInViewport('.home-ask-section'));
          }
          isScrollDown =  1; //Scrolling Down
        } else {
          // ACTION ON
          // SCROLLING UP
          isScrollDown =  0; //Scrolling up
        }
        lastScrollTop = nowScrollTop;
      }
    });
    return isScrollDown;
  }