Haskell Language Learning Note (semigroup)

Semigroup

class Semigroup a where        (<>) :: a -> a -> a        sconcat :: NonEmpty a -> a        stimes :: Integral b => b -> a -> aclass Semigroup a => Monoid a where        mempty  :: a        mappend :: a -> a -> a        mappend = (<>)        mconcat :: [a] -> a        mconcat = foldr mappend mempty

A semigroup (semigroup) is a type class, which is the base class of the unitary semigroups (monoid).

Haskell Language Learning Note (semigroup)