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

    xmonad-contrib XMonad.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. 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

  2. (!!*) :: (Functor m, Functor r, Num a) => m (r a) -> a -> m (r a)

    linear Linear.Matrix

    Matrix-scalar product 

    >>> V2 (V2 1 2) (V2 3 4) !!* 5
V2 (V2 5 10) (V2 15 20)

  3. (!!/) :: (Functor m, Functor r, Fractional a) => m (r a) -> a -> m (r a)

    linear Linear.Matrix

    Matrix-scalar division

  4. (!!?) :: [a] -> Int -> Maybe a

    relude Relude.List

    Safer version of !!, returns a Maybe. Get element from list using index value starting from `0`. 

    >>> [] !!? 0
Nothing

    >>> ["a", "b", "c"] !!? 3
Nothing

    >>> [1, 2, 3] !!? (-1)
Nothing

    >>> ["a", "b", "c"] !!? 2
Just "c"

  5. data (a6989586621681141368 :: NonEmpty a) !!@#@$$ (b :: TyFun Natural a)

    singletons-base Data.List.NonEmpty.Singletons

    No documentation available.

  6. type family (a6989586621681141368 :: NonEmpty a) !!@#@$$$ (a6989586621681141369 :: Natural) :: a

    singletons-base Data.List.NonEmpty.Singletons

    No documentation available.

  7. data (a6989586621679826768 :: [a]) !!@#@$$ (b :: TyFun Natural a)

    singletons-base Data.List.Singletons

    No documentation available.

  8. type family (a6989586621679826768 :: [a]) !!@#@$$$ (a6989586621679826769 :: Natural) :: a

    singletons-base Data.List.Singletons

    No documentation available.

  9. data (a6989586621679826768 :: [a]) !!@#@$$ (b :: TyFun Natural a)

    singletons-base Prelude.Singletons

    No documentation available.

  10. type family (a6989586621679826768 :: [a]) !!@#@$$$ (a6989586621679826769 :: Natural) :: a

    singletons-base Prelude.Singletons

    No documentation available.

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