Increment value in twig file -

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I have a loop with a .twig file that outputs elements.

I have to increase a value with each element. I know how to do this in PHP, but it does not explain how to do it with a twig document. Any suggestions I really can not do in the controller? {/ MyVal = myVal + 10}} {% endfor%}

use it : 

  {% set myVal = 50%} {% for item in item}%} {% MyVal = myVal + 10%} {% endfor%}   
, you set  {%%}  to set prices, set blocks / forms, etc. For output,  {{}}     is

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