How to render a tree in Twig

Question

I would like to render a tree with an undetermined depth (children of children of children, etc.). I need to loop through the array recursively; how can I do this in Twig?

Answer 1

Took flu's answer and modified it a little:

{# Macro #}

{% macro tree(items) %}
    {% import _self as m %}
        {% if items %}
        

            {% for i in items %}
                

                    {{ i.title }}
                    {{ m.tree(i.items) }}
                
            {% endfor %}
        
    {% endif %}
{% endmacro %}

{# Usage #}

{% import 'macros.twig' as m %}

{{ m.tree(items) }}