Check and remove repeat entries from loop

Question

Is it possible to loop through the list of entries and filter out any that have the same ID as any of the other entries (duplicates)? I have a specific case where this is an issue. I want to keep the first entry, but filter out the rest of them. I'm thinking it might work something like this...

  {% for event in events %}
    {% IF FIRST INSTANCE OF ENTRY %}
      {{ event.title }}
    {% endif %}
  {% endfor %}

Answer 1

I'd probably try to filter those out in your initial query, but if you've already got them, something like this should work:

{% set existingIds = [] %}

{% for event in events %}
    {% if event.id not in existingIds %}
        {{ event.title }}

        {% set existingIds = existingIds|merge([event.id]) %}
    {% endif %}
{% endfor %}