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

Modulecomonad-5.0.9Haskell2010

Control.Comonad.Identity

  • 1 type
  • Packagecomonad-5.0.9
  • Exports1
  • LanguageHaskell2010
  • LicenceBSD-3-Clause
  • SourceIdentity.hs

module Control.Comonad

newtypenewtype Identity a
#

Identity functor and monad. (a non-strict monad)

Examples
Example1 expression
fmap (+1) (Identity 0)Identity 1
Example1 expression
Identity [1, 2, 3] <> Identity [4, 5, 6]Identity [1,2,3,4,5,6]
>>> do
      x <- Identity 10
      y <- Identity (x + 5)
      pure (x + y)
Identity 25

Constructors

Instances45Monad, Functor, MonadFix, Applicative, Foldable, Traversable, …

module Control.Comonad.Trans.Identity