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constrained-categories Control.Category.Constrained.Prelude The distinction between mapM_ and traverse_ doesn't really make sense on grounds of Monoidal / Applicative vs Monad, but it has in fact some benefits to restrict this to endofunctors, to make the constraint list at least somewhat shorter.
mappend :: Monoid a => a -> a -> aconstrained-categories Control.Category.Constrained.Prelude An associative operation NOTE: This method is redundant and has the default implementation mappend = (<>) since base-4.11.0.0. Should it be implemented manually, since mappend is a synonym for (<>), it is expected that the two functions are defined the same way. In a future GHC release mappend will be removed from Monoid.
mapM :: (Traversable t, Monad m) => (a -> m b) -> t a -> m (t b)copilot-language Copilot.Language.Prelude Map each element of a structure to a monadic action, evaluate these actions from left to right, and collect the results. For a version that ignores the results see mapM_.
Examples
mapM is literally a traverse with a type signature restricted to Monad. Its implementation may be more efficient due to additional power of Monad.mapM_ :: (Foldable t, Monad m) => (a -> m b) -> t a -> m ()copilot-language Copilot.Language.Prelude Map each element of a structure to a monadic action, evaluate these actions from left to right, and ignore the results. For a version that doesn't ignore the results see mapM. mapM_ is just like traverse_, but specialised to monadic actions.
mappend :: Monoid a => a -> a -> acopilot-language Copilot.Language.Prelude An associative operation NOTE: This method is redundant and has the default implementation mappend = (<>) since base-4.11.0.0. Should it be implemented manually, since mappend is a synonym for (<>), it is expected that the two functions are defined the same way. In a future GHC release mappend will be removed from Monoid.
type family
MapSub (e :: k) (xs :: [Type]) :: [Type]gogol-core Gogol.Prelude Apply (e :>) to every API in xs.
data
MapMSym0 (a1 :: TyFun a ~> m b t a ~> m t b)singletons-base Prelude.Singletons No documentation available.
data
MapMSym1 (a6989586621680751881 :: a ~> m b) (b1 :: TyFun t a m t b)singletons-base Prelude.Singletons No documentation available.
type family
MapMSym2 (a6989586621680751881 :: a ~> m b) (a6989586621680751882 :: t a) :: m t bsingletons-base Prelude.Singletons No documentation available.
type family
MapM_ (a1 :: a ~> m b) (a2 :: t a) :: m ()singletons-base Prelude.Singletons No documentation available.