Re: Easy syntax question

29 Aug 2001


      On 27 Aug 2001, Mike Gunter wrote:

(snip)
...
Or, if you need several cases, you can use something like:
...
funcGuard n | n `elem` [2,5,9]   = 5
            | n `elem` [4,18]    = 1
            | otherwise          = 7
or, if you want an expression:
...
caseGuard n     = case undefined of
                   _ | n `elem` [2,5,9]   -> 5
                     | n `elem` [4,18]    -> 1
                     | otherwise          -> 7
Thanks - that's very helpful! (-: I hadn't thought of using 'elem'. Most
of the cases are going to be ones like "if x = 5 or x = 7" instead of "if
x = 6 or y = 'a'" so that should work well.

-- Mark

Re: Easy syntax question

Mark Carroll