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Within LTS Haskell 24.36 (ghc-9.10.3)

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

    strict Data.Strict.Maybe

    Analogous to catMaybes in Data.Maybe.

  2. fromMaybe :: a -> Maybe a -> a

    strict Data.Strict.Maybe

    Given a default value and a Maybe, yield the default value if the Maybe argument is Nothing and extract the value out of the Just otherwise.

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

    strict Data.Strict.Maybe

    Analogous to listToMaybe in Data.Maybe.

  4. mapMaybe :: (a -> Maybe b) -> [a] -> [b]

    strict Data.Strict.Maybe

    Analogous to mapMaybe in Data.Maybe.

  5. combSpanMaybe :: SrcSpanInfo -> Maybe SrcSpanInfo -> SrcSpanInfo

    haskell-src-exts Language.Haskell.Exts.SrcLoc

    Like (<+?>), but it also concatenates the srcInfoPoints.

  6. catMaybes :: (IsSequence (f (Maybe t)), Functor f, Element (f (Maybe t)) ~ Maybe t) => f (Maybe t) -> f t

    mono-traversable Data.Sequences

    Takes all of the Just values from a sequence of Maybe ts and concatenates them into an unboxed sequence of ts. Since 0.6.2

  7. leftToMaybe :: Either a b -> Maybe a

    either Data.Either.Combinators

    Maybe get the Left side of an Either. 

    leftToMaybe ≡ either Just (const Nothing)
    Using Control.Lens: 
    leftToMaybe ≡ preview _Left
leftToMaybe x ≡ x^?_Left

    >>> leftToMaybe (Left 12)
Just 12

    >>> leftToMaybe (Right 12)
Nothing

  8. rightToMaybe :: Either a b -> Maybe b

    either Data.Either.Combinators

    Maybe get the Right side of an Either. 

    rightToMaybe ≡ either (const Nothing) Just
    Using Control.Lens: 
    rightToMaybe ≡ preview _Right
rightToMaybe x ≡ x^?_Right

    >>> rightToMaybe (Left 12)
Nothing

    >>> rightToMaybe (Right 12)
Just 12

  9. fromMaybe :: e -> Maybe a -> Exceptional e a

    explicit-exception Control.Monad.Exception.Synchronous

    No documentation available.

  10. fromMaybeT :: forall (m :: Type -> Type) e a . Monad m => e -> MaybeT m a -> ExceptionalT e m a

    explicit-exception Control.Monad.Exception.Synchronous

    No documentation available.

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