Re: [Haskell-beginners] The case expression

On Fri, Jan 23, 2009 at 02:01:41PM +1100, Erik de Castro Lopo wrote:

Hi all,

Ocaml's match .. with expression (very similar to Haskell's case) allows multiple matches for a single result (naive example):

let f x = match x with | 0 -> "zero" | 1 | 3 | 5 | 7 -> "odd" | 2 | 4 | 6 | 8 -> "even" _ -> "bad number"

Is there a similar thing in Haskell?

There isn't, but in this particular case (and in many similar cases) you could always do something like this, using guards: let f x | x == 0 -> "zero" | x `elem` [1,3,5,7] -> "odd" | x `elem` [2,4,6,8] -> "even" | otherwise -> "bad number" -Brent