Popularity

9.3

Stable

Activity

8.9

Declining

Stars 2,387

Watchers 83

Forks 613

Last Commit 6 days ago

Description

FS2 is a streaming I/O library. The design goals are compositionality, expressiveness, resource safety, and speed.

Programming language: Scala

License: GNU General Public License v3.0 or later

Tags: Scala.js Async FP Data Streaming

Latest version: v3.0.0-M6

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README

FS2: Functional Streams for Scala

Overview

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).

FS2 is available for Scala 2.12, Scala 2.13, Scala 3, and Scala.js and Scala Native. FS2 is built upon two major functional libraries for Scala, Cats, and Cats-Effect. Regardless of those dependencies, FS2 core types (streams and pulls) are polymorphic in the effect type (as long as it is compatible with cats-effect typeclasses), and thus FS2 can be used with other effect libraries, such as Monix.

Getting Started

Quick links:

Documentation and getting help

There are Scaladoc API documentations for [the core library][core-api], which defines and implements the core types for streams and pulls, as well as the type aliases for pipes and sinks. The io library provides FS2 bindings for NIO-based file I/O and TCP/UDP networking.
The official guide is a good starting point for learning more about the library.
The documentation page is intended to serve as a list of all references, including conference presentation recordings, academic papers, and blog posts, on the use and implementation of fs2.
The FAQ has frequently asked questions. Feel free to open issues or PRs with additions to the FAQ!
Also feel free to come discuss and ask/answer questions in the Typelevel Discord channel and/or on StackOverflow using the tag FS2. Discord will generally get you a quicker answer.