Re: [Haskell-beginners] Case statements shorter

On Monday 01 November 2010 16:59:33, Angel Alonso wrote:

Hi,

I have the following piece of code:

n = 3 case n of 3 -> "Something" 4 -> "Something" _ -> "Other"

Is it possible to shorten the case statement into something like this?:

n = 3 case n of 3 or 4 -> "Something" _ -> "Other"

No, case does a pattern match. You can do case n of _ | n `elem` [3,4] -> "Something" | otherwise -> "Other" however, which becomes really useful if you have case expression of pat1 | cond11 -> thing11 | cond12 -> thing12 | otherwise -> thing1Other pat2 | cond21 -> thing21 ...

Thanks.

-- Angel Alonso