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Within LTS Haskell 24.32 (ghc-9.10.3)

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1. minusNaturalMaybe :: Natural -> Natural -> Maybe Natural

   base	GHC.Natural

   Natural subtraction. Returns Nothings for non-positive results.

2. naturalToWordMaybe :: Natural -> Maybe Word

   base	GHC.Natural

   Try downcasting Natural to Word value. Returns Nothing if value doesn't fit in Word.

3. naturalToWordMaybe# :: Natural -> (# (# #) | Word# #)

   base	GHC.Num

   No documentation available.

4. indexMaybe :: ByteString -> Int -> Maybe Word8

   bytestring	Data.ByteString

   O(1) ByteString index, starting from 0, that returns Just if:

   0 <= n < length bs
   

5. indexMaybe :: ByteString -> Int -> Maybe Char

   bytestring	Data.ByteString.Char8

   O(1) ByteString index, starting from 0, that returns Just if:

   0 <= n < length bs
   

6. indexMaybe :: ByteString -> Int64 -> Maybe Word8

   bytestring	Data.ByteString.Lazy

   O(c) ByteString index, starting from 0, that returns Just if:

   0 <= n < length bs
   

7. indexMaybe :: ByteString -> Int64 -> Maybe Char

   bytestring	Data.ByteString.Lazy.Char8

   O(1) ByteString index, starting from 0, that returns Just if:

   0 <= n < length bs
   

8. indexMaybe :: ShortByteString -> Int -> Maybe Word8

   bytestring	Data.ByteString.Short

   O(1) ShortByteString index, starting from 0, that returns Just if:

   0 <= n < length bs
   

9. indexMaybe :: ShortByteString -> Int -> Maybe Word8

   bytestring	Data.ByteString.Short.Internal

   O(1) ShortByteString index, starting from 0, that returns Just if:

   0 <= n < length bs
   

10. mapMaybe :: (a -> Maybe b) -> IntMap a -> IntMap b

    containers	Data.IntMap.Internal

    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"
    

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