[Haskell-beginners] How to extract from Maybe & Either in GHCi

[Benjamin Edwards]

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?
>
> thanks
> Lee Short
>
>
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