Setting element of array from Twig

Question

How can I set member of an already existing array from Twig?

I tried doing it next way:

{% set arr[\'element\'] = \'value\' %}

but

Answer 1

I had this problem sometime ago. Imagine you have an array like this one:

data = {
    'user': 'admin',
    'password': 'admin1234',
    'role': 'admin',
    'group': 'root',
    'profile': 'admin',
    'control': 'all',
    'level': 1,
    'session': '#DFSFASADASD02',
    'pre_oa': 'PRE-OA',
    'hepa_oa': 'HEPA-OA',
    'pre_ra': 'HEPA-RA',
    'hepa_ra': 'HEPA-RA',
    'deodor_ra': 'DEODOR-RA'
}

So, you want to show this data in two rows, but remove the password from that list. To this end, split in 2 arrays will be easy with the slice filter. However, we have to remove the password. For that reason, I'm using this snippet. The idea is to put all the elements lesser than the data elements size divided by 2. To calculate this we use the filter length. Now to get the index of the current element we user loop.index. And finally we *push an associative element in the left or right array. An associative array has two components key and value. To reference an array key in twit we operator () and we use the merge filter to push into the array as shown here {% set left_list = left_list|merge({ (key): value }) %}

This is the complete solution.

{% set left_list = {} %}
{% set right_list = {} %}
{% set limit = data|length // 2 %}
{% for key, value in data|cast_to_array %}
{% if key != 'password' %}
{% if loop.index <= limit %}
{% set left_list = left_list|merge({ (key): value }) %}
{% else %}
{% set right_list = right_list|merge({ (key): value }) %}
{% endif %}
{% endif %}
{% endfor %}
{% for key, value in left_list %}

{{key}}


{% endfor %}