geolite-csv
contravariant
| geolite-csv | contravariant | |
|---|---|---|
| 1 | 1 | |
| 43 | 72 | |
| - | - | |
| 2.8 | 0.0 | |
| about 2 months ago | about 2 years ago | |
| Haskell | Haskell | |
| BSD 3-clause "New" or "Revised" License | BSD 3-clause "New" or "Revised" License |
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geolite-csv
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Co-Applicative programming style
This is neat, and I tried going down the road of using Divisible for things years ago. This can be seem in a very old version of siphon's test suite. The data type for a CSV encoding has a trivial Divisible instance. However, as tekmo hints at in the post, the ergonomics of Divisible are pretty bad. Bad enough that I ended up just giving up on it (well, I had to decide if I wanted to swap the order of some type arguments to become a Profunctor, and I did not mourn the loss of the Divisible instance). Perhaps with the right syntactic sugar, it could be more useful.
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?
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effect-monad - Provides 'graded monads' and 'parameterised monads' to Haskell, enabling fine-grained reasoning about effects.
postgrest - REST API for any Postgres database
streamproc - Haskell library providing a continuation-based stream processor arrow
stripe-core - :moneybag: Stripe API
recursion-schemes - Generalized bananas, lenses and barbed wire
json - Haskell JSON library
managed - A monad for managed values