Kevin Clees <k.cl...@web.de> writes:
> Now my function looks like this:
>
> tmp:: [(Int, Int)] -> Int -> (Int, Int)
> tmp [] y = (0,0)
^^^^^
> tmp xs y = xs !! (y-1)
> If the function returns (0,0) it will blocked by another function.
Personally, I think using "special" values like this is a code smell,
and indicates poor design. There are many implicit assumptions, for
instance that (0,0) isn't already a member of the input list, and that
this is correctly handled by surrounding functions. Generally, it's
much more desirable to encode this in the types, so I would vastly
prefer the Maybe solution in almost all cases, which makes these
assumptions explicit.
-k
--
If I haven't seen further, it is by standing in the footprints of giants
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