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  1. newtype Last a

    base Data.Monoid

    Maybe monoid returning the rightmost non-Nothing value. Last a is isomorphic to Dual (First a), and thus to Dual (Alt Maybe a) Data.Semigroup.Last. The former returns the last non-Nothing, so x <> Data.Monoid.Last Nothing = x. The latter simply returns the last value, thus x <> Data.Semigroup.Last Nothing = Data.Semigroup.Last Nothing.

    Examples

    >>> Last (Just "hello") <> Last Nothing <> Last (Just "world")
    Last {getLast = Just "world"}
    
    >>> Last Nothing <> mempty
    Last {getLast = Nothing}
    

  2. Last :: Maybe a -> Last a

    base Data.Monoid

    No documentation available.

  3. newtype Last a

    base Data.Semigroup

    Beware that Data.Semigroup.Last is different from Data.Monoid.Last. The former simply returns the last value, so x <> Data.Semigroup.Last Nothing = Data.Semigroup.Last Nothing. The latter returns the last non-Nothing, thus x <> Data.Monoid.Last Nothing = x.

    Examples

    >>> Last 0 <> Last 10
    Last {getLast = 10}
    
    >>> sconcat $ Last 1 :| [ Last n | n <- [2..]]
    Last {getLast = * hangs forever *
    

  4. Last :: a -> Last a

    base Data.Semigroup

    No documentation available.

  5. newtype Last a

    base-compat Data.Monoid.Compat

    Maybe monoid returning the rightmost non-Nothing value. Last a is isomorphic to Dual (First a), and thus to Dual (Alt Maybe a) Data.Semigroup.Last. The former returns the last non-Nothing, so x <> Data.Monoid.Last Nothing = x. The latter simply returns the last value, thus x <> Data.Semigroup.Last Nothing = Data.Semigroup.Last Nothing.

    Examples

    >>> Last (Just "hello") <> Last Nothing <> Last (Just "world")
    Last {getLast = Just "world"}
    
    >>> Last Nothing <> mempty
    Last {getLast = Nothing}
    

  6. Last :: Maybe a -> Last a

    base-compat Data.Monoid.Compat

    No documentation available.

  7. newtype Last a

    base-compat Data.Semigroup.Compat

    Beware that Data.Semigroup.Last is different from Data.Monoid.Last. The former simply returns the last value, so x <> Data.Semigroup.Last Nothing = Data.Semigroup.Last Nothing. The latter returns the last non-Nothing, thus x <> Data.Monoid.Last Nothing = x.

    Examples

    >>> Last 0 <> Last 10
    Last {getLast = 10}
    
    >>> sconcat $ Last 1 :| [ Last n | n <- [2..]]
    Last {getLast = * hangs forever *
    

  8. Last :: a -> Last a

    base-compat Data.Semigroup.Compat

    No documentation available.

  9. newtype Last a

    generic-deriving Generics.Deriving.Monoid

    Maybe monoid returning the rightmost non-Nothing value. Last a is isomorphic to Dual (First a), and thus to Dual (Alt Maybe a) Data.Semigroup.Last. The former returns the last non-Nothing, so x <> Data.Monoid.Last Nothing = x. The latter simply returns the last value, thus x <> Data.Semigroup.Last Nothing = Data.Semigroup.Last Nothing.

    Examples

    >>> Last (Just "hello") <> Last Nothing <> Last (Just "world")
    Last {getLast = Just "world"}
    
    >>> Last Nothing <> mempty
    Last {getLast = Nothing}
    

  10. Last :: Maybe a -> Last a

    generic-deriving Generics.Deriving.Monoid

    No documentation available.

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