Increment value in twig file

Use this:

{% set myVal = 50 %}

{% for item in items %}
     {% set myVal = myVal + 10 %}
{% endfor %}

For declaring, setting values, setting blocks/forms, etc. you must use {% %}. For output, there is {{ }}

Here is the better way -

{% for item in items %}
  {% set counter = ( counter | default(0) ) + 1 %}
  <p>{{ counter ~ ' ). ' ~ item.title }}</p>
{% endfor %}

See how the counter is being increased by 1.

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