View Fiddle

file1.art

% Select command in ART is very similar to the concept of switch-case structures in common programming languages
% We can define option statements enclosing the code to be executed if option value matches variable value and
% We can have otherwise branch which will be executed if none of the optios are met

FIRST:
#adapt: "file2.art"
   #set var1 = "A" 
#endadapt

SECOND:
#adapt: "file2.art"
    #set var1 = "C"
#endadapt

file2.art

#select var1
   #option A
      -- Var1 is "A"
   #endoption
   #option "B"
      -- Var1 is "B"
   #endoption
   #otherwise
      -- Var1 is not "A" and not "B"
   #endotherwise
#endselect

file3.art

output

FIRST:

      -- Var1 is "A"
   
SECOND:

      -- Var1 is not "A" and not "B"