Why doesn't TWIG see my variable?

Question

Drupal

Drupal8. I print the current URL and this code works {{ url('<current>') }}
Now I want to split the url and get part of it, and it doesn't work

{% set my_url = url('<current>')|split('/') %}{{ my_url[2] }}

Why does the twig display url('') in the first case and not in the second?

Answer 1

It is better to move such logic to hook_preprocess() and use a ready-made variable in the twig.