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1. handleJust_ :: (SomeException -> Maybe b) -> (b -> IO a) -> IO a -> IO a

   extra	Extra

   Like catch_ but for handleJust

2. tryJust_ :: (SomeException -> Maybe b) -> IO a -> IO (Either b a)

   extra	Extra

   Like catch_ but for tryJust

3. untilJustM :: Monad m => m (Maybe a) -> m a

   extra	Extra

   Keep running an operation until it becomes a Just, then return the value inside the Just as the result of the overall loop.

4. whenJust :: Applicative m => Maybe a -> (a -> m ()) -> m ()

   extra	Extra

   Perform some operation on Just, given the field inside the Just. This is a specialized for_.

   whenJust Nothing  print == pure ()
   whenJust (Just 1) print == print 1
   

5. whenJustM :: Monad m => m (Maybe a) -> (a -> m ()) -> m ()

   extra	Extra

   Like whenJust, but where the test can be monadic.

6. whileJustM :: (Monad m, Monoid a) => m (Maybe a) -> m a

   extra	Extra

   Keep running an operation until it becomes a Nothing, accumulating the monoid results inside the Justs as the result of the overall loop.

7. breakJust :: (a -> Maybe b) -> [a] -> ([a], Maybe (b, [a]))

   utility-ht	Data.List.HT

   forAllMaybeFn $ \f xs -> snd (breakJust f xs) == dropWhileNothing f xs
   

8. segmentAfterJust :: (a -> Maybe b) -> [a] -> ([([a], b)], [a])

   utility-ht	Data.List.HT

   >>> segmentAfterJust (\c -> toMaybe (isLetter c) (toUpper c)) "123a5345b---"
   ([("123",'A'),("5345",'B')],"---")
   

9. segmentBeforeJust :: (a -> Maybe b) -> [a] -> ([a], [(b, [a])])

   utility-ht	Data.List.HT

   >>> segmentBeforeJust (\c -> toMaybe (isLetter c) (toUpper c)) "123a5345b---"
   ("123",[('A',"5345"),('B',"---")])
   

10. spanJust :: (a -> Maybe b) -> [a] -> ([b], [a])

    utility-ht	Data.List.HT

    No documentation available.

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