Liquid templates: even/odd items in for loop

I think you’ll want to use the cycle tag for this. For example:

{% for post in site.categories.articles %}
   <article class="{% cycle 'odd', 'even' %}"></article>
{% endfor %}

If you want different HTML markup for each cycle:

{% for item in site.posts %}
  {% capture thecycle %}{% cycle 'odd', 'even' %}{% endcapture %}
  {% if thecycle == 'odd' %}
    <div>echo something</div>
  {% endif %}
{% endfor %}

You can find more information on it at Liquid for Designers, although the example there isn’t particularly helpful. This Shopify support thread should also help.

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