Twig template ignoring value in a for loop

Question

I'm looking to ignore a value in an array, so that only three of the four children are displayed here. There are four items in the page.root but I only want to display three of them.

<nav role="navigation">
    <ul>
      {% for child in page.root %}
        <li>
          <a href="{{ child.url }}">{{ child.title }}</a>
        </li>
      {% endfor %}
    </ul>
</nav>

Looking through the documentation I can't find a way of limiting the for loop.

Thanks for the help!

============

Right, I was running Stacey app that also uses Twig. Sorry for that, I should have been more specific.

With stacey, slice is a method so this solves my problem:

<nav role="navigation">
    <ul>
      {% for child in slice (page.root, 0,3) %}
        <li>
          <a href="{{ child.url }}">{{ child.title }}</a>
        </li>
      {% endfor %}
    </ul>
</nav>

I found that here . This correctly outputs only three of the children in page.root.

Answer 1

"The template system is meant to express presentation not program logic." - Django documentation

So, you can use if statment,

{% for child in page.root %}
  {% if child.title != 'any title' %}
  <li>
    <a href="{{ child.url }}">{{ child.title }}</a>
  </li>
  {% endif %}
{% endfor %}

For the more information

Answer 2

The common solution for "printing only the first n items" is the slice filter:

{% for child in page.root|slice(0, 3) %}
    {# params are start and length, so that means the first 3 items #}
{% endfor %}