If you're absolutely certain that the lookup always succeeds, then you
can use pattern matching as follows:
where
jr = joinTuples sc x val
key = getPartialTuple is x
Just val = Map.lookup key m
On 6/3/09, Nico Rolle <nro...@web.de> wrote:
> hi there
>
> heres a code snipped, don't care about the parameters.
> the thing is i make a lookup on my map "m" and then branch on that return
> value
>
> probePhase is sc [] m = []
> probePhase is sc (x:xs) m
> | val == Nothing = probePhase is sc xs m
> | otherwise = jr ++ probePhase is sc xs m
> where
> jr = joinTuples sc x (fromMaybe [] val)
> key = getPartialTuple is x
> val = Map.lookup key m
>
>
> the line "jr = joinTuples sc x (fromMaybe [] val)" is kind of ugly
> because i know that it is not Nothing.
> is there a better way to solve this?
> regards
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>
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