That isn't built in though.
On Fri, Jun 17, 2011 at 8:24 PM, Tacit Sawk
<tacit@kwasticat.com> wrote:
Hello!
I tried Hoogle, but it didn't seem to have what I was after. I'm
looking for something like this:
> maybeWhen :: Bool -> a -> Maybe a
> maybeWhen cond =
> if cond
> then Just
> else const Nothing
Is there a builtin that has the above sort of behaviour? I suppose
it can even be generalised:
> maybeWhen :: (MonadPlus m) => Bool -> a -> m a
> maybeWhen cond =
> if cond
> then return
> else const mzero
Tacit
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