functor-combinators

Tools for working with functor combinators: types that take functors (or other indexed types) and returns a new functor that "enhances" or "mixes" them in some way. In the process, you can design featureful programs by composing smaller "primitives" using basic unversal combinators. The main entry point is Data.Functor.Combinators, but more fine-grained functionality and extra combinators (some of them re-implementations for compatibility) are available in other modules as well. This library does not define new functor combinators for the most part, but rather re-exports them from different parts of the Haskell ecosystem and provides a uniform interface. See the README for a quick overview, and also https://blog.jle.im/entry/functor-combinatorpedia.html for an in-depth dive into the motivation behind functor combinator-driven development, examples of the functor combinators in this library, and details about how to use these abstractions!