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GHC 9.10.3 · lts/ghc-9.10.x · 248f8f0 · 2026-10-05

Moduleghc-internal-9.1003.0Haskell2010

GHC.Internal.Functor.ZipList

  • 1 type
newtypenewtype ZipList a
#

Lists, but with an Applicative functor based on zipping.

Examples

In contrast to the Applicative for GHC.List.List:

Example1 expression
(+) <$> [1, 2, 3] <*> [4, 5, 6][5,6,7,6,7,8,7,8,9]

The Applicative instance of ZipList applies the operation by pairing up the elements, analogous to zipWithN

Example1 expression
(+) <$> ZipList [1, 2, 3] <*> ZipList [4, 5, 6]ZipList {getZipList = [5,7,9]}
Example1 expression
(,,,) <$> ZipList [1, 2] <*> ZipList [3, 4] <*> ZipList [5, 6] <*> ZipList [7, 8]ZipList {getZipList = [(1,3,5,7),(2,4,6,8)]}
Example1 expression
ZipList [(+1), (^2), (/ 2)] <*> ZipList [5, 5, 5]ZipList {getZipList = [6.0,25.0,2.5]}

Constructors

Instances16Functor, Applicative, Foldable, Traversable, Alternative, Generic1, …
  • Functor ZipListDefined in ghc-internal-9.1003.0 · GHC.Internal.Functor.ZipList
  • Applicative ZipListDefined in ghc-internal-9.1003.0 · GHC.Internal.Functor.ZipList
    f <$> ZipList xs1 <*> ... <*> ZipList xsN
    = ZipList (zipWithN f xs1 ... xsN)

    where zipWithN refers to the zipWith function of the appropriate arity (zipWith, zipWith3, zipWith4, ...). For example:

    (\a b c -> stimes c [a, b]) <$> ZipList "abcd" <*> ZipList "567" <*> ZipList [1..]
    = ZipList (zipWith3 (\a b c -> stimes c [a, b]) "abcd" "567" [1..])
    = ZipList {getZipList = ["a5","b6b6","c7c7c7"]}
  • Foldable ZipListDefined in ghc-internal-9.1003.0 · GHC.Internal.Functor.ZipList
  • Traversable ZipListDefined in ghc-internal-9.1003.0 · GHC.Internal.Functor.ZipList
  • Alternative ZipListDefined in ghc-internal-9.1003.0 · GHC.Internal.Functor.ZipList
  • Generic1 ZipListDefined in ghc-internal-9.1003.0 · GHC.Internal.Functor.ZipList
  • IsList (ZipList a)Defined in ghc-internal-9.1003.0 · GHC.Internal.IsList
  • Eq a => Eq (ZipList a)Defined in ghc-internal-9.1003.0 · GHC.Internal.Functor.ZipList
  • Data a => Data (ZipList a)Defined in ghc-internal-9.1003.0 · GHC.Internal.Functor.ZipList
  • Ord a => Ord (ZipList a)Defined in ghc-internal-9.1003.0 · GHC.Internal.Functor.ZipList
  • Read a => Read (ZipList a)Defined in ghc-internal-9.1003.0 · GHC.Internal.Functor.ZipList
  • Show a => Show (ZipList a)Defined in ghc-internal-9.1003.0 · GHC.Internal.Functor.ZipList
  • Generic (ZipList a)Defined in ghc-internal-9.1003.0 · GHC.Internal.Functor.ZipList
  • type Rep (ZipList a) = D1 ('MetaData "ZipList" "GHC.Internal.Functor.ZipList" "ghc-internal" 'True) (C1 ('MetaCons "ZipList" 'PrefixI 'True) (S1 ('MetaSel ('Just "getZipList") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 [a])))Defined in ghc-internal-9.1003.0 · GHC.Internal.Functor.ZipList
  • type Rep1 ZipList = D1 ('MetaData "ZipList" "GHC.Internal.Functor.ZipList" "ghc-internal" 'True) (C1 ('MetaCons "ZipList" 'PrefixI 'True) (S1 ('MetaSel ('Just "getZipList") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec1 [])))Defined in ghc-internal-9.1003.0 · GHC.Internal.Functor.ZipList
  • type Item (ZipList a) = aDefined in ghc-internal-9.1003.0 · GHC.Internal.IsList