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[comment]: # (Start Badges) [](https://travis-ci.org/frees-io/freestyle) [](http://codecov.io/github/frees-io/freestyle?branch=master) [](https://oss.sonatype.org/#nexus-search;gav~io.frees~frees*) [](https://index.scala-lang.org/frees-io/freestyle) [](https://raw.githubusercontent.com/frees-io/freestyle/master/LICENSE) [](https://gitter.im/47deg/freestyle?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge) [](https://github.com/frees-io/freestyle/issues) [](http://scala-js.org) [comment]: # (End Badges) # Documentation Full documentation available at [http://frees.io](http://frees.io) # Build purely functional applications and libraries Build stack-safe purely functional applications and libraries that support parallel and sequential computations where declaration is decoupled from interpretation. Freestyle encourages programs built atop [Free algebras](http://frees.io/docs/core/algebras/) that are interpreted at the edge of your application ensuring effects are localized and performed in a controlled environment. Applications built with Freestyle can be interpreted to any runtime semantics supported by the interpreter target type. ```scala import freestyle.free._ @free trait Database { def get(id: UserId): FS[User] } @free trait Cache { def get(id: UserId): FS[User] } @module trait Persistence { val database: Database val cache: Cache } ``` # Automatic Dependency Injection Freestyle includes all the implicit machinery necessary to achieve seamless dependency injection of [`@free`](http://frees.io/docs/core/algebras/) and [`@module`](http://frees.io/docs/core//modules/) Algebras. Simply require any of your `@free` or `@module` trait as implicits where needed. ```scala def storedUsers[F[_]] (userId: UserId) (implicit persistence: Persistence[F]): FreeS[F, (User, User)] = { import persistence._ for { cachedUser <- cache.get(userId) persistentUser <- database.get(userId) } yield (cachedUser, persistentUser) } ``` # Ready to use integrations Freestyle ships with [ready to use algebras and convenient syntax extensions](http://frees.io/docs/integrations/) covering most of the application concerns such as persistence, configuration, logging, etc. In addition Freestyle includes commonly used FP [effects](http://frees.io/docs/effects/) stack such as `option`, `error`, `reader`, `writer`, `state` based on the capabilities of the target runtime interpreters. ```scala def loadUser[F[_]] (userId: UserId) (implicit doobie: DoobieM[F], logging: LoggingM[F]): FreeS[F, User] = { import doobie.implicits._ for { user <- (sql"SELECT * FROM User WHERE userId = $userId" .query[User] .unique .liftFS[F]) _ <- logging.debug(s"Loaded User: ${user.userId}") } yield user } ``` ## Modules + [freestyle](http://frees.io/docs/) - Core module including building blocks for boilerplate free FP programs and apps over Free monads and cats. + [effects](http://frees.io/docs/effects/) - MTL style effects such as reader, writer, state, error, and more modeled as free algebras. + [logging](http://frees.io/docs/patterns/logging/) - A purely functional logging algebra over Verizon's Journal. + [cache](http://frees.io/docs/effects/Cache/) - A generic cache with in memory and redis based implementations. ## Integrations + [fetch](http://frees.io/docs/integrations/fetch/) - Integration with the Fetch library for efficient data access from heterogenous datasources. + [fs2](http://frees.io/docs/integrations/fs2/) - Integration to run fs2 Streams in Freestyle programs. + [monix](http://frees.io/docs/integrations/monix/) - Instances and utilities to interpret to `monix.eval.Task`. + [slick](http://frees.io/docs/integrations/slick/) - Embedding of DBIO actions in Freestyle programs. + [doobie](http://frees.io/docs/integrations/doobie/) - Embedding of Doobie ConnectionIO actions in Freestyle programs. + http - Adapters and marshallers to run the Freestyle program in endpoint return types for [akka-http](http://frees.io/docs/integrations/akkahttp/), [finch](http://frees.io/docs/integrations/finch/), [http4s](http://frees.io/docs/integrations/http4s/) and [play](http://frees.io/docs/integrations/play/). ## Freestyle Artifacts Freestyle is compatible with both Scala JVM and Scala.js. This project supports Scala 2.11 and 2.12. The project is based on [scalameta](http://scalameta.org/). To use the project, add the following to your build.sbt: ```scala addCompilerPlugin("org.scalameta" % "paradise" % "3.0.0-M11" cross CrossVersion.full) ``` [comment]: # (Start Replace) For Scala.jvm: ```scala // required libraryDependencies += "io.frees" %% "frees-core" % "0.8.2" // optional - effects and patterns libraryDependencies += "io.frees" %% "frees-effects" % "0.8.2" libraryDependencies += "io.frees" %% "frees-async" % "0.8.2" libraryDependencies += "io.frees" %% "frees-async-cats-effect" % "0.8.2" libraryDependencies += "io.frees" %% "frees-async-guava" % "0.8.2" libraryDependencies += "io.frees" %% "frees-cache" % "0.8.2" libraryDependencies += "io.frees" %% "frees-config" % "0.8.2" libraryDependencies += "io.frees" %% "frees-logging" % "0.8.2" // optional - integrations libraryDependencies += "io.frees" %% "frees-cache-redis" % "0.8.2" libraryDependencies += "io.frees" %% "frees-doobie" % "0.8.2" libraryDependencies += "io.frees" %% "frees-fetch" % "0.8.2" libraryDependencies += "io.frees" %% "frees-akka" % "0.8.2" libraryDependencies += "io.frees" %% "frees-finch" % "0.8.2" libraryDependencies += "io.frees" %% "frees-http-client" % "0.8.2" libraryDependencies += "io.frees" %% "frees-http4s" % "0.8.2" libraryDependencies += "io.frees" %% "frees-monix" % "0.8.2" libraryDependencies += "io.frees" %% "frees-play" % "0.8.2" libraryDependencies += "io.frees" %% "frees-slick" % "0.8.2" libraryDependencies += "io.frees" %% "frees-twitter-util" % "0.8.2" ``` For Scala.js: ```scala // required libraryDependencies += "io.frees" %%% "frees-core" % "0.8.2" // optional - effects and patterns libraryDependencies += "io.frees" %%% "frees-effects" % "0.8.2" libraryDependencies += "io.frees" %%% "frees-async" % "0.8.2" libraryDependencies += "io.frees" %%% "frees-async-cats-effect" % "0.8.2" libraryDependencies += "io.frees" %%% "frees-async-fs2" % "0.8.2" libraryDependencies += "io.frees" %%% "frees-async-monix" % "0.8.2" libraryDependencies += "io.frees" %%% "frees-cache" % "0.8.2" libraryDependencies += "io.frees" %%% "frees-http-client" % "0.8.2" libraryDependencies += "io.frees" %%% "frees-logging" % "0.8.2" // optional - integrations libraryDependencies += "io.frees" %%% "frees-fetch" % "0.8.2" libraryDependencies += "io.frees" %%% "frees-monix" % "0.8.2" ``` [comment]: # (End Replace) ## Freestyle Examples * [todolist-lib](./modules/examples/todolist-lib). * [todolist-http-http4s](./modules/examples/todolist-http-http4s). * [todolist-http-finch](./modules/examples/todolist-http-finch). * [slick-example](.modules/examples/slick-example). ## Commercial Support 47 Degrees offers commercial support for the Freestyle framework and associated technologies. To find out more, visit [47 Degrees' Open Source Support](https://www.47deg.com/services/open-source-support/). [comment]: # (Start Copyright) # Copyright Freestyle is designed and developed by 47 Degrees Copyright (C) 2017-2018 47 Degrees. [comment]: # (End Copyright)

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