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Within LTS Haskell 24.2 (ghc-9.10.2)
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(
!! ) :: HasCallStack => [a] -> Int -> aCabal-syntax Distribution.Compat.Prelude No documentation available.
(
!! ) :: HasCallStack => [a] -> Int -> arelude Relude.Unsafe List index (subscript) operator, starting from 0. It is an instance of the more general genericIndex, which takes an index of any integral type. WARNING: This function is partial, and should only be used if you are sure that the indexing will not fail. Otherwise, use !?. WARNING: This function takes linear time in the index.
Examples
>>> ['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
(
!! ) :: HasCallStack => NonEmpty a -> Int -> abase-compat-batteries 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.
type family (a1 :: NonEmpty a)
!! (a2 :: Natural) :: asingletons-base Data.List.NonEmpty.Singletons No documentation available.
type family (a1 :: [a])
!! (a2 :: Natural) :: asingletons-base Data.List.Singletons No documentation available.
type family (a1 :: [a])
!! (a2 :: Natural) :: asingletons-base Prelude.Singletons No documentation available.
-
basement Basement.Compat.ExtList No documentation available.
(
!! ) :: HasCallStack => [a] -> Int -> aprotolude Protolude.Partial List index (subscript) operator, starting from 0. It is an instance of the more general genericIndex, which takes an index of any integral type. WARNING: This function is partial, and should only be used if you are sure that the indexing will not fail. Otherwise, use !?. WARNING: This function takes linear time in the index.
Examples
>>> ['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
(
!! ) :: HasCallStack => [a] -> Int -> aghc-internal GHC.Internal.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. WARNING: This function is partial, and should only be used if you are sure that the indexing will not fail. Otherwise, use !?. WARNING: This function takes linear time in the index.
Examples
>>> ['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
(
!! ) :: HasCallStack => [a] -> Int -> aghc-internal GHC.Internal.Data.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. WARNING: This function is partial, and should only be used if you are sure that the indexing will not fail. Otherwise, use !?. WARNING: This function takes linear time in the index.
Examples
>>> ['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