Twig - different output of even and odd posts?

Question

Twig

You need to output posts in the specified format, how to do it using Twig inside the loop: {% for post in posts %}
(how to create a variable and check its parity?)

Answer 1

Found what I was looking for - Twig has a special parity check construct

{% if var is even%}
  ...
{% endif %}

{% if var is odd%}
  ...
{% endif %}

Answer 2

You can use the cycle function , and use it to add the row__even and row__odd classes, and style it through css.

{% for post in posts %}
  <div class="row row__{{ cycle(['even', 'odd'], loop.index0) }}">
  </div>
{% endfor %}

If you definitely want to change the markup, then use this https://twig.symfony.com/doc/2.x/tests/divisibleby.html