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Concept:

Higher-kinded polymorphism

Headline

Type parameters of a higher kind than "*"

Illustration

Higher-kinded polymorphism is popular in Language:Haskell with several well-known type classes being parameterized in type constructors rather than types. For instance, the following important Haskell type classes use kind "*->*":

  • Type class Functor; see the concept of functor.
  • Type class Monad; see the concept of monad.
For comparison, many popular Haskell type classes are not higher-kinded, i.e., they are parameterized in kind "*", e.g.:
  • Type class Show.
  • Type class Eq.

Ralf Lämmel edited this article at Sat, 13 Jun 2020 14:51:06 +0200
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