Add div after every 3d element twig loop, modulus

Question

Hi so i have this twig loop, and what i need to to is after every 3rd element to add some html to close div row and open new one.

I tried with various snippets from this website but no luck with any one of them

<div class="row">
    {% for date, date_info in dates %}
        <div class="col-sm-4">
            <div class="event-box">
                {% for category in date_info.events %}
                    {% for event in category %}
                        <div class="event-header">
                            {% if event.get_runtime( 'content_img_url' ) is empty %}
                                {{ event | avatar( [
                                'post_thumbnail',
                                'location_avatar',
                                'category_avatar'
                                ]) | raw }}
                            {% endif %}
                            <div class="event-date">
                                {{ date | month }}
                                {{ date | day }}
                            </div>
                            <div class="event-footer">
                                <h3>{{ event.get_runtime( 'filtered_title' ) | raw }}</h3>
                                <div class="event-time">
                                    {{ event | timespan( 'short' ) | raw }}...
                                </div>
                                <div class="event-content"> {{ event.get_runtime( 'filtered_content' ) | slice(0,200) | raw }}</div>

                                <a  class="btn btn-success" href="{{ event.get_runtime( 'instance_permalink' ) | e('html_attr') }}">
                                    {{ text_read_more }}
                                </a>
                            </div>
                        </div>
                    {% endfor %} {# event in category #}
                {% endfor %} {# category in date_info.events #}
            </div>
        </div>
    {% endfor %} {# date, date_info in dates #}
</div>

Answer 1

You can use the batch filter instead (New in 1.12.3).

{% for date, date_info in dates|batch(3) %}
   .....
   .....
{% endfor %}