https://github.com/typelevel/spotted-leopards
Proof of concept for a cats-like library built using Dotty features
https://github.com/typelevel/spotted-leopards
functional-programming scala typelevel
Last synced: 2 months ago
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Proof of concept for a cats-like library built using Dotty features
- Host: GitHub
- URL: https://github.com/typelevel/spotted-leopards
- Owner: typelevel
- License: apache-2.0
- Created: 2019-05-29T20:16:43.000Z (over 6 years ago)
- Default Branch: main
- Last Pushed: 2024-06-01T14:41:40.000Z (over 1 year ago)
- Last Synced: 2025-07-21T15:44:59.685Z (2 months ago)
- Topics: functional-programming, scala, typelevel
- Language: Scala
- Size: 65.4 KB
- Stars: 117
- Watchers: 12
- Forks: 11
- Open Issues: 3
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Metadata Files:
- Readme: README.md
- License: COPYING
- Authors: AUTHORS.md
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README
# Spotted Leopards
Spotted Leopards = Dotty + Cats
Spotted Leopards is a proof of concept for a cats-like library built using Dotty features, with no concern for source compatibility with the existing Cats library. This project has a few goals:
- explore how new language features in Dotty could be used to improve the encodings of functional type classes and related data types, perhaps informing future Cats / Dotty roadmap
- provide feedback on Dotty features from the perspective of cats library authors
- provide a code base of significant size that can be used for learning and exploring Dotty
In short, this project is an *experiment only* and will not in any way become a library that should be used for real work. This project is *NOT* a preview of a future Cats version. Rather, it provides a way to explore the design space of the Dotty language features without the constraints of source compatibility and cross-building expected of Cats proper.
## Getting Started
To get started, launch `sbt console` and run the following:
```scala
scala> import leopards.{*, given} // Import various types like Monad and OptionT and type class instances
scala> Some(1).map2(Some(2), _ + _)
val res0: Option[Int] = Some(3)
scala> OptionT.fromOption[List, Int](res0)
val res1: leopards.OptionT[List, Int] = List(Some(3))
```