for key twig code example

Example 1: twig for

<ul>
    {% for key, user in users %}
        <li>{{ key }}: {{ user.username|e }}</li>
    {% endfor %}
</ul>

Example 2: twig loop variables

{% for user in users %}
    {{ loop.index }} - {{ user.username }}
{% endfor %}

Example 3: how to for loop twig

{% for letter in 'a'..'z' %}
    * {{ letter }}
{% endfor %}