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Functional programming tools: option, either, task, state, optics, etc.

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# DEPRECATED

This repository has been replaced by [functional](https://github.com/nullpub/fun)!

It will be kept alive as a historical reference and as a deno target in the
event that someone is relying on its existence.

# hkts ![Deno](https://github.com/nullpub/hkts/workflows/Deno/badge.svg?branch=master)

Higher kinded types for [Deno](https://deno.land). As an avid user of
[fp-ts](https://github.com/gcanti/fp-ts) I wanted to have a similarly full
featured environment in Deno. Unfortunately, the fp-ts port to Deno is clunky to
use with other functional libraries like
[@nll/datum](https://github.com/nullpub/datum),
[io-ts](https://github.com/gcanti/io-ts), and
[monocle-ts](https://github.com/gcanti/monocle-ts). While I could have ported
fp-ts directly, I've come to like the exploratory work done by pelotom in the
original [hkts](http://github.com/pelotom/hkts). Thus, I've decided to port the
functionality of fp-ts, io-ts, and monocle-ts to Deno using the HKT substitution
developed by pelotom.

This library is primarily an exercise, but I intend to maintain 100% test
coverage. Instead of breaking out the clones of io-ts, monocle-ts, and datum
into other Deno modules they will all be landed here. There will be no barrel
exports as importing in Deno is much cleaner without them. Contributions are
welcome.

## Installation

This library is meant to be used with Deno, thus it follows the
[Deno imports](https://deno.land/manual/examples/import_export) syntax.

## Conventions

This library focuses first on implementing
[static-land](https://github.com/fantasyland/static-land) type classes for a
given Algebraic Data Type (ie. Either or Option). These type class modules are
then exported from the ADT's namespace (eg.
`import { Monad } from 'https://deno.land/x/hkts/option.ts'`).

With the exception of instance constructors (ie. getShow or getSemigroup) other
ADT functions should all be pipeable. For functions that derive from type class
modules, like `chain` or `map`, there are helpers in `derivations.ts` that will
generate the pipeable versions for you.

For good examples of the above conventions look at the `either.ts` or
`option.ts`.

# Documentation

For the foreseeable future this library will not focus on documentation.
Questions are welcome via
[github issues](https://github.com/nullpub/hkts/issues) but I can't guaruntee
speedy responses. Once a decent collection of ADTs and other utilities are
ported and all the pre-1.0.0 todo items in `TODO.md` are complete I'll shift to
documentation. Even then it's likely that I'll auto-generate the raw docs from
exported function and statement types and will devote any time to building an
example library that doubles as extra tests.

hkts

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