Increase loop index in twig

Question

Below is my code. I want to increase J loop index in between inner loop so I have incremented J variable but it is not working.

`{% for j in 0..(products|length-1) %}
{% for f in 0..(rows-1) %}
{% set j = j + 1 %}
{% endfor %}
{% endfor %}`

Is there any other way to increase loop index?

Answer 1

Its not possible to alter the loop indeces of twig due to the fact of how the loops are compiled

{% for i in 1..5 %} for example gets compiled as

$context['_seq'] = twig_ensure_traversable(range(1, 5));
foreach ($context['_seq'] as $context["_key"] => $context["i"]) {
    //..
}

I do have another aproach for you to solve this with twig

{% set rows = 2 %}
{% set items = ((products|length) / rows) | round %}

{% for product in products %}
    {% if loop.index0 % items == 0 %}
<div class="row">
    {% endif %}
    <div class="product">
        {{ product }}
    </div>
    {% if loop.index % items == 0 or loop.last %}
</div>
    {% endif %}
{% endfor %}