Re: [Haskell-cafe] Is there a null statement that does nothing?

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

http://www.haskell.org/haskellwiki/Case