Are there anyway to express the "iterating" of a user-defined data type in
Haskell?
For example, in
data Shape = Square | Circle | Triangle
how can I 'iterate' them and apply them all to the same function without
indicating them explicitly?
such as [func Square, func Circle, func Triangle].
Can I use a form similar to the following case in a list instead:
Numbers = [1,2,3,4,5]
[func x | x <- Numbers ]
Actually what I want is to obtain all the possible values of a data type
(Shape).
Thank you very much!
Best wishes,
Raeck
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