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Within LTS Haskell 22.25 (ghc-9.6.5)

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Exact lookup

1. newtype () => First a

   linear-base	Data.Monoid.Linear

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

   Examples

   >>> First 0 <> First 10
   First 0
   

   >>> sconcat $ First 1 :| [ First n | n <- [2 ..] ]
   First 1
   

2. First :: a -> First a

   linear-base	Data.Monoid.Linear

   No documentation available.

3. FIRST :: Keyword

   sql-words	Language.SQL.Keyword.Type

   No documentation available.

4. newtype () => First a

   testing-feat	Test.Feat.Enumerate

   Maybe monoid returning the leftmost non-Nothing value. First a is isomorphic to Alt Maybe a, but precedes it historically. Beware that Data.Monoid.First is different from Data.Semigroup.First. The former returns the first non-Nothing, so Data.Monoid.First Nothing <> x = x. The latter simply returns the first value, thus Data.Semigroup.First Nothing <> x = Data.Semigroup.First Nothing.

   Examples

   >>> First (Just "hello") <> First Nothing <> First (Just "world")
   First {getFirst = Just "hello"}
   

   >>> First Nothing <> mempty
   First {getFirst = Nothing}
   

5. First :: Maybe a -> First a

   testing-feat	Test.Feat.Enumerate

   No documentation available.

6. First :: HistIndex b

   histogram-fill	Data.Histogram

   Bin with index 0

7. First :: HistIndex b

   histogram-fill	Data.Histogram.Generic

   Bin with index 0

8. pattern First :: FS TermF a -> FS TermF a

   rzk	Language.Rzk.Free.Syntax

   No documentation available.

9. First :: a -> Term' a -> Term' a

   rzk	Language.Rzk.Syntax.Abs

   No documentation available.

10. newtype () => First a

    stack	Stack.Prelude

    Maybe monoid returning the leftmost non-Nothing value. First a is isomorphic to Alt Maybe a, but precedes it historically. Beware that Data.Monoid.First is different from Data.Semigroup.First. The former returns the first non-Nothing, so Data.Monoid.First Nothing <> x = x. The latter simply returns the first value, thus Data.Semigroup.First Nothing <> x = Data.Semigroup.First Nothing.

    Examples

    >>> First (Just "hello") <> First Nothing <> First (Just "world")
    First {getFirst = Just "hello"}
    

    >>> First Nothing <> mempty
    First {getFirst = Nothing}
    

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