[Haskell-beginners] How to extract from Maybe & Either in GHCi
edwards.benj at gmail.com
Thu Apr 14 00:19:31 CEST 2011
Use the maybe function from Data.Maybe.
maybe :: b -> (a->b) -> Maybe b -> b
On 13 April 2011 23:14, <blackcat at pro-ns.net> wrote:
> I've got some values in GHCi that look like
> Just (Left (Blah [stuff]))
> and I'd like to pull out the (Blah [stuff]) to operate on it. Is there a
> way to do this directly in GHCi without writing a helper function?
> Lee Short
> Beginners mailing list
> Beginners at haskell.org
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