can-i-haz
contravariant
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| can-i-haz | contravariant | |
|---|---|---|
| - | 1 | |
| 14 | 72 | |
| - | - | |
| 0.0 | 0.0 | |
| 12 months ago | almost 2 years ago | |
| Haskell | Haskell | |
| BSD 3-clause "New" or "Revised" License | BSD 3-clause "New" or "Revised" License |
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can-i-haz
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Tracking mentions began in Dec 2020.
contravariant
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Co-Applicative programming style
The operator also pops up in George Wilson's 2018 talk, Contravariant Functors: the Other Side of the Coin, along with (>*) and (*<) operators to help things along. Shortly after its publication, Issue #57 for contravariant was raised, suggesting not only (>*<) but the other operators from George's talk.
What are some alternatives?
control-monad-free - Free monads and monad transformers
transient - A full stack, reactive architecture for general purpose programming. Algebraic and monadically composable primitives for concurrency, parallelism, event handling, transactions, multithreading, Web, and distributed computing with complete de-inversion of control (No callbacks, no blocking, pure state)
hdph - Haskell distributed parallel Haskell
effect-monad - Provides 'graded monads' and 'parameterised monads' to Haskell, enabling fine-grained reasoning about effects.
managed - A monad for managed values
these - An either-or-both data type, with corresponding hybrid error/writer monad transformer.
streamproc - Haskell library providing a continuation-based stream processor arrow
recursion-schemes - Generalized bananas, lenses and barbed wire
var-monad - The VarMonad typeclass, as defined by "Type Classes: an exploration of the design space" by SPJ et al, 1997.
retry - Retry combinators for monadic actions that may fail
monadbi - BiDirectional monads that can be transformed into each other (atleast partially).
hask - Category theory for Haskell with a lens flavor (you need GHC 7.8.3, not 7.8.2 to build this!)