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Within LTS Haskell 24.2 (ghc-9.10.2)
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rio RIO.Prelude (++) appends two lists, i.e.,
[x1, ..., xm] ++ [y1, ..., yn] == [x1, ..., xm, y1, ..., yn] [x1, ..., xm] ++ [y1, ...] == [x1, ..., xm, y1, ...]
If the first list is not finite, the result is the first list.Performance considerations
This function takes linear time in the number of elements of the first list. Thus it is better to associate repeated applications of (++) to the right (which is the default behaviour): xs ++ (ys ++ zs) or simply xs ++ ys ++ zs, but not (xs ++ ys) ++ zs. For the same reason concat = foldr (++) [] has linear performance, while foldl (++) [] is prone to quadratic slowdownExamples
>>> [1, 2, 3] ++ [4, 5, 6] [1,2,3,4,5,6]
>>> [] ++ [1, 2, 3] [1,2,3]
>>> [3, 2, 1] ++ [] [3,2,1]
(
++ ) :: Vector v a => v a -> v a -> v ario RIO.Vector No documentation available.
(
++ ) :: Vector a -> Vector a -> Vector ario RIO.Vector.Boxed No documentation available.
(
++ ) :: Storable a => Vector a -> Vector a -> Vector ario RIO.Vector.Storable No documentation available.
(
++ ) :: Unbox a => Vector a -> Vector a -> Vector ario RIO.Vector.Unboxed No documentation available.
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Cabal-syntax Distribution.Compat.Prelude No documentation available.
type family (xs :: [k])
++ (ys :: [k]) :: [k]relude Relude.Extra.Type Concatenates type-level lists.
>>> :kind! '[ 'Just 5, 'Nothing] ++ '[ 'Just 3, 'Nothing, 'Just 1] '[ 'Just 5, 'Nothing] ++ '[ 'Just 3, 'Nothing, 'Just 1] :: [Maybe Natural] = '[ 'Just 5, 'Nothing, 'Just 3, 'Nothing, 'Just 1]
>>> :kind! '[] ++ '[ 'Just 3, 'Nothing, 'Just 1] '[] ++ '[ 'Just 3, 'Nothing, 'Just 1] :: [Maybe Natural] = '[ 'Just 3, 'Nothing, 'Just 1]
# 91 "srcReludeExtra/Type.hs"-
relude Relude.List.Reexport (++) appends two lists, i.e.,
[x1, ..., xm] ++ [y1, ..., yn] == [x1, ..., xm, y1, ..., yn] [x1, ..., xm] ++ [y1, ...] == [x1, ..., xm, y1, ...]
If the first list is not finite, the result is the first list.Performance considerations
This function takes linear time in the number of elements of the first list. Thus it is better to associate repeated applications of (++) to the right (which is the default behaviour): xs ++ (ys ++ zs) or simply xs ++ ys ++ zs, but not (xs ++ ys) ++ zs. For the same reason concat = foldr (++) [] has linear performance, while foldl (++) [] is prone to quadratic slowdownExamples
>>> [1, 2, 3] ++ [4, 5, 6] [1,2,3,4,5,6]
>>> [] ++ [1, 2, 3] [1,2,3]
>>> [3, 2, 1] ++ [] [3,2,1]
data ((b :: [a])
++ (c :: [a])) (d :: [a])first-class-families Fcf List catenation.
Example
>>> data Example where Ex :: a -> Example -- Hide the type of examples to avoid brittleness in different GHC versions >>> :kind! Ex (Eval ([1, 2] ++ [3, 4]) :: [Natural]) Ex (Eval ([1, 2] ++ [3, 4]) :: [Natural]) :: Example = Ex [1, 2, 3, 4]
data ((b :: [a])
++ (c :: [a])) (d :: [a])first-class-families Fcf.Data.List List catenation.
Example
>>> data Example where Ex :: a -> Example -- Hide the type of examples to avoid brittleness in different GHC versions >>> :kind! Ex (Eval ([1, 2] ++ [3, 4]) :: [Natural]) Ex (Eval ([1, 2] ++ [3, 4]) :: [Natural]) :: Example = Ex [1, 2, 3, 4]