Hoogle Search

Within LTS Haskell 22.21 (ghc-9.6.5)

Note that Stackage only displays results for the latest LTS and Nightly snapshot. Learn more.

Exact lookup

1. (!!) :: HasCallStack => [a] -> Int -> a

   base	Prelude

   List index (subscript) operator, starting from 0. It is an instance of the more general genericIndex, which takes an index of any integral type.

   >>> ['a', 'b', 'c'] !! 0
   'a'
   
   >>> ['a', 'b', 'c'] !! 2
   'c'
   
   >>> ['a', 'b', 'c'] !! 3
   *** Exception: Prelude.!!: index too large
   
   >>> ['a', 'b', 'c'] !! (-1)
   *** Exception: Prelude.!!: negative index
   

   WARNING: This function is partial. You can use atMay instead.

2. (!!) :: HasCallStack => [a] -> Int -> a

   base	Data.List

   List index (subscript) operator, starting from 0. It is an instance of the more general genericIndex, which takes an index of any integral type.

   >>> ['a', 'b', 'c'] !! 0
   'a'
   
   >>> ['a', 'b', 'c'] !! 2
   'c'
   
   >>> ['a', 'b', 'c'] !! 3
   *** Exception: Prelude.!!: index too large
   
   >>> ['a', 'b', 'c'] !! (-1)
   *** Exception: Prelude.!!: negative index
   

   WARNING: This function is partial. You can use atMay instead.

3. (!!) :: HasCallStack => NonEmpty a -> Int -> a

   base	Data.List.NonEmpty

   xs !! n returns the element of the stream xs at index n. Note that the head of the stream has index 0. Beware: a negative or out-of-bounds index will cause an error.

4. (!!) :: HasCallStack => [a] -> Int -> a

   base	GHC.List

   List index (subscript) operator, starting from 0. It is an instance of the more general genericIndex, which takes an index of any integral type.

   >>> ['a', 'b', 'c'] !! 0
   'a'
   
   >>> ['a', 'b', 'c'] !! 2
   'c'
   
   >>> ['a', 'b', 'c'] !! 3
   *** Exception: Prelude.!!: index too large
   
   >>> ['a', 'b', 'c'] !! (-1)
   *** Exception: Prelude.!!: negative index
   

   WARNING: This function is partial. You can use atMay instead.

5. (!!) :: HasCallStack => [a] -> Int -> a

   base	GHC.OldList

   List index (subscript) operator, starting from 0. It is an instance of the more general genericIndex, which takes an index of any integral type.

   >>> ['a', 'b', 'c'] !! 0
   'a'
   
   >>> ['a', 'b', 'c'] !! 2
   'c'
   
   >>> ['a', 'b', 'c'] !! 3
   *** Exception: Prelude.!!: index too large
   
   >>> ['a', 'b', 'c'] !! (-1)
   *** Exception: Prelude.!!: negative index
   

   WARNING: This function is partial. You can use atMay instead.

6. (!!) :: Bundle v a -> Int -> a

   vector	Data.Vector.Fusion.Bundle

   Element at the given position

7. (!!) :: Monad m => Bundle m v a -> Int -> m a

   vector	Data.Vector.Fusion.Bundle.Monadic

   Element at the given position

8. (!!) :: HasCallStack => [a] -> Int -> a

   amazonka-core	Amazonka.Prelude

   List index (subscript) operator, starting from 0. It is an instance of the more general genericIndex, which takes an index of any integral type.

   >>> ['a', 'b', 'c'] !! 0
   'a'
   
   >>> ['a', 'b', 'c'] !! 2
   'c'
   
   >>> ['a', 'b', 'c'] !! 3
   *** Exception: Prelude.!!: index too large
   
   >>> ['a', 'b', 'c'] !! (-1)
   *** Exception: Prelude.!!: negative index
   

   WARNING: This function is partial. You can use atMay instead.

9. (!!) :: HasCallStack => NonEmpty a -> Int -> a

   base-compat	Data.List.NonEmpty.Compat

   xs !! n returns the element of the stream xs at index n. Note that the head of the stream has index 0. Beware: a negative or out-of-bounds index will cause an error.

10. (!!) :: HasCallStack => [a] -> Int -> a

    hedgehog	Hedgehog.Internal.Prelude

    List index (subscript) operator, starting from 0. It is an instance of the more general genericIndex, which takes an index of any integral type.

    >>> ['a', 'b', 'c'] !! 0
    'a'
    
    >>> ['a', 'b', 'c'] !! 2
    'c'
    
    >>> ['a', 'b', 'c'] !! 3
    *** Exception: Prelude.!!: index too large
    
    >>> ['a', 'b', 'c'] !! (-1)
    *** Exception: Prelude.!!: negative index
    

    WARNING: This function is partial. You can use atMay instead.

Page 1 of many | Next