Re: [Haskell-cafe] A simple beginner question

On Tue, Jun 3, 2008 at 5:11 PM, Adam Smyczek wrote:

Example:

data SampleType = A | B Int | C String | D -- .... etc.

sampleTypes = [A, B 5, C "test"] :: [SampleType]

How do I find for example element A in the sampleTypes list? Do I have to create e.g.:

isA :: SampleType -> Bool isA A = True isA _ = False

for every constructor and use find?

isA is already defined for every constructor, so all you have to do is "find isA"

It feels like this is not the quicker method.

Thanks, Adam

_______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe