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All Projects → typelevel → Cats Mtl

typelevel / Cats Mtl

Licence: other
cats transformer type classes.

Programming Languages

scala
5932 projects

Labels

functional-programmingmonadcats

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Cats MTL

Provides transformer typeclasses for cats' Monads, Applicatives and Functors.

You can have multiple cats-mtl transformer typeclasses in scope at once without implicit ambiguity, unlike in pre-1.0.0 cats or Scalaz 7.

Usage

libraryDependencies += "org.typelevel" %% "cats-mtl" % "1.1.1"

If your project uses ScalaJS, replace the double-% with a triple. Note that cats-mtl has an upstream dependency on cats-core version 2.x.

Cross-builds are available for Scala 2.12, 2.13, 3.0.0-M2, 3.0.0-M3, and ScalaJS major version 1.x.

If you're not sure where to start or what Cats MTL even is, please refer to the getting started guide.

Supported Classes

  • EitherT
  • Kleisli
  • IorT
  • OptionT
  • ReaderWriterStateT
  • StateT
  • WriterT

Laws

The cats-mtl-laws artifact provides Discipline-style laws for all of the type classes defined in cats-mtl. It is relatively easy to use these laws to test your own implementations of these typeclasses. Take a look here for more.

libraryDependencies += "org.typelevel" %% "cats-mtl-laws" % "1.1.1" % Test

These laws are compatible with both Specs2 and ScalaTest.

Documentation

Links:

  1. Website: typelevel.org/cats-mtl/
  2. ScalaDoc: typelevel.org/cats-mtl/api/

Related Cats links (the core):

  1. Website: typelevel.org/cats/
  2. ScalaDoc: typelevel.org/cats/api/

Community

People are expected to follow the Scala Code of Conduct when discussing cats-mtl on the Github page, Gitter channel, or other venues.

We hope that our community will be respectful, helpful, and kind. If you find yourself embroiled in a situation that becomes heated, or that fails to live up to our expectations, you should disengage and contact one of the project maintainers in private. We hope to avoid letting minor aggressions and misunderstandings escalate into larger problems.

License

All code is available to you under the MIT license, available at http://opensource.org/licenses/mit-license.php and also in the COPYING file.

Note that the project description data, including the texts, logos, images, and/or trademarks, for each open source project belongs to its rightful owner. If you wish to add or remove any projects, please contact us at [email protected].