Counting the number of elements in array

Question

I am looking to count the number of entries I have in an array in Twig  This is the code I ve tried     for nc in notcount      nc length      endfor     This however only produces the length of the string of one of the values in the array     nc   will produce an output of all the values of the array  there are 2  but I want the output to be just the number 2  the count  and not all the information in the array

User · Answer

This expands on the answer by Denis Bubnov.

I used this to find child values of array elements—namely if there was a anchor field in paragraphs on a Drupal 8 site to build a table of contents.

{% set count = 0 %}
{% for anchor in items %}
    {% if anchor.content['#paragraph'].field_anchor_link.0.value %}
        {% set count = count + 1 %}
    {% endif %}
{% endfor %}

{% if count > 0 %}
 ---  build the toc here --
{% endif %}

User · Answer

Best practice of getting length is use length filter returns the number of items of a sequence or mapping  or the length of a string  For example     notcount   length     But you can calculate count of elements in for loop  For example      set count   0       for nc in notcount           set count   count   1       endfor        count      This solution helps if you want to calculate count of elements by condition  for example you have a property name inside object and you want to calculate count of objects with not empty names      set countNotEmpty   0       for nc in notcount if nc name           set countNotEmpty   countNotEmpty   1       endfor        countNotEmpty      Useful links    length set for

User · Answer

Just use the length filter on the whole array  It works on more than just strings      notcount length

[twig] Counting the number of elements in array

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