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Cats A library intended to provide abstractions for functional programming in Scala, leveraging its unique features. Design goals are approachability, modularity, documentation and efficiency. js / jvm / native Cats-Effect The IO Monad for Scala, plus type classes for general effect types. js / jvm / native fs2 FS2 is a library for purely functional, effectful, and polymorphic stream processing library in the Scala programming language. Its design goals are compositionality, expressiveness, resource safety, and speed. The name is a modified acronym for Functional Streams for Scala (FSS, or FS2). js / jvm / native http4s A typeful, purely functional HTTP library for client and server applications js / jvm / native

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