iterating through types as a function?

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Koriolis

There is no "active one". What you need is to make your function return the found object, or null if not found.

Function findtruck.truck( id$ )
  For t.Truck = Each truck
    If truck\ID = id THen
      Return t
    End If
  Next
  Return Null
End Function

Then:

blah blah
t.truck = findtruck( "bigtruck" )
If t = Null Then
  ;handle case where not found
Else
  x# = truck\x#
  etc
EndIf