windows - echoing dynamically generated variable -

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set css_folder_source=.\css set js_folder_source=.\js    %%a in (js, css ) (      if defined %%a_folder_source (         echo  %%%a_folder_source%%     ) )

i want read contents of both folders. don't know how dynamically generate folder_source names

use delayed expansion:

setlocal enabledelayedexpansion  ............ %%a in (js css) (     echo !%%a_folder_source! )

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