Dan Weston schrieb: > If you have a long if/else if/else chain, you might consider a trivial > case statement with guards. Whether you think this is attractive is a > matter of taste, but it has the fall-through semantics you want and ghc > optimizes the _ pattern matching away: > > f x = case () of > _| x == 2 -> 22 > _| x == 4 -> 44 > _| x == 7 -> 77 > _| otherwise -> 55 > >> f 4 > 44 >> f 9 > 55
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