eff

Extensible effects are an alternative to monad transformers for computing with effects in a functional way. This library is based on the "free-er" monad and an "open union" of effects described in Oleg Kiselyov in Freer monads, more extensible effects.

You can learn more in the User Guide:

• your first effects
• included effects: Reader, Writer, Eval, State,...
• using an open or a closed union of effects
• create your own effects
• working with different effect stacks

Installation

You add eff-scalaz as an sbt dependency:

libraryDependencies += "org.atnos" %% "eff-scalaz" % "1.3"

or download it from here.

Contributing

eff-scalaz is a Typelevel project. This means we embrace pure, typeful, functional programming, and provide a safe and friendly environment for teaching, learning, and contributing as described in the Typelevel Code of Conduct.

Feel free to open an issue if you notice a bug, have an idea for a feature, or have a question about the code. Pull requests are also gladly accepted.