menu with first, last & count classes in twig Drupal8 template

menu--main.html.twig

{#
/**
 * @file
 * Theme override to display a menu.
 *
 * Available variables:
 * - menu_name: The machine name of the menu.
 * - items: A nested list of menu items. Each menu item contains:
 *   - attributes: HTML attributes for the menu item.
 *   - below: The menu item child items.
 *   - title: The menu link title.
 *   - url: The menu link url, instance of \Drupal\Core\Url
 *   - localized_options: Menu link localized options.
 */
#}
{% import _self as menus %}

{#
  We call a macro which calls itself to render the full tree.
  @see http://twig.sensiolabs.org/doc/tags/macro.html
#}
{{ menus.menu_links(items, attributes, 0) }}
{% macro menu_links(items, attributes, menu_level) %}
  {% import _self as menus %}
  {% if items %}
    {% if menu_level == 0 %}
      <ul{{ attributes.addClass('menu') }}>
    {% else %}
      <ul>
    {% endif %}
      {% for item in items %}
        {# by the magic of loop #}
        {% if loop.first %}
          <li{{ item.attributes.addClass('first') }}>
        {% elseif loop.last %}
          <li{{ item.attributes.addClass('last') }}>
        {% elseif loop.index == "2" %}
          <li{{ item.attributes.addClass('two') }}>
          {{ loop.index0 }}
        {% elseif loop.revindex == "2" %}
          <li{{ item.attributes.addClass('two-left') }}>
        {% else %}
          <li{{ item.attributes }}>
          {{ item.attributes }}
        {% endif %}
          {{ link(item.title, item.url) }}

          {% if item.below %}
            {{ menus.menu_links(item.below, attributes, menu_level + 1) }}
          {% endif %}
        </li>
      {% endfor %}
    </ul>
  {% endif %}
{% endmacro %}

and yes this is an example for people that dont wanna use
li:first-child{ ... }
li:last-child{ ... }
li:nth-child(4n){...}

How do I add a different class to the dropdown menu than the main ul

@penskyc Did you implement another class to drop down/ child menu ?

@penskyc @mortendk I'm also stuck with dropdown capability. Perhaps there is a simple solution?