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Within LTS Haskell 24.65 (ghc-9.10.3)

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1. headMaybe :: [a] -> Maybe a

   rio	RIO.List

   No documentation available.

2. initMaybe :: [a] -> Maybe [a]

   rio	RIO.List

   No documentation available.

3. lastMaybe :: [a] -> Maybe a

   rio	RIO.List

   No documentation available.

4. maximumByMaybe :: Foldable t => (a -> a -> Ordering) -> t a -> Maybe a

   rio	RIO.List

   No documentation available.

5. maximumMaybe :: (Ord a, Foldable t) => t a -> Maybe a

   rio	RIO.List

   No documentation available.

6. minimumByMaybe :: Foldable t => (a -> a -> Ordering) -> t a -> Maybe a

   rio	RIO.List

   No documentation available.

7. minimumMaybe :: (Ord a, Foldable t) => t a -> Maybe a

   rio	RIO.List

   No documentation available.

8. tailMaybe :: [a] -> Maybe [a]

   rio	RIO.List

   No documentation available.

9. mapMaybe :: (a -> Maybe b) -> Map k a -> Map k b

   rio	RIO.Map

   Map values and collect the Just results.

   let f x = if x == "a" then Just "new a" else Nothing
   mapMaybe f (fromList [(5,"a"), (3,"b")]) == singleton 5 "new a"
   

10. mapMaybeWithKey :: (k -> a -> Maybe b) -> Map k a -> Map k b

    rio	RIO.Map

    Map keys/values and collect the Just results.

    let f k _ = if k < 5 then Just ("key : " ++ (show k)) else Nothing
    mapMaybeWithKey f (fromList [(5,"a"), (3,"b")]) == singleton 3 "key : 3"
    

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