If else a twig in a row, bug not working standart code

Question

I need a little help, I'm trying to switch to a twig темплате of standard php code. But something is wrong, although i read the template documentation well.

My Code

<?php echo $pr['price'] . ($pr['unit'] ? '/' . $pr['unit'] : ''); ?>

{{ pr.price . pr.unit ? '/' . pr.unit : '' }}

How do you think I can solve the problem with this one-line check, something wrong with the rules and the check?

Answer 1

In twig you use ~ to concat strings, u'd also need to add parantheses, just like you did in php

{{ pr.price ~ (pr.unit ? '/' ~ pr.unit : '') }}

demo