Drupal CSS Standards
Drupal CSS standards documentation.
Drupal CSS standards documentation.
Drupal theming docs.
You may want to transform a value in a twig template.
You can do that by checking a condition on the value in an if, and provide values in the then/else.
{% set newvalue = value == 'asdf' ? '123': '456' %}
If you have different inputs and outputs, you can create a switch like this.
{% set title_color = {green: 'text-green-3', yellow: 'text-yellow-2', blue: 'text-grey-2'}[color] %}
This defines an object, then uses the input value to retrieve the mapped result.