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Cats-Effect is a Scala library that provides a high-performance, purely functional, asynchronous runtime. It enables safe and composable effect management (i.e. side-effects, concurrency, resource safety) in functional Scala applications. It defines abstractions like IO, Resource, Concurrent, etc. It allows writing applications that manage resources safely (closing/opening, cleanup), schedule tasks, handle concurrency, define asynchronous callbacks, interoperation, and graceful shutdown. It is a core part of the Typelevel ecosystem.
Features
- The IO monad / effect type that captures synchronous and asynchronous computations, delayed effects, etc.
- Resource safety abstractions (Resource, Bracket, etc.) ensuring that setup/cleanup of resources is correctly handled even in error / cancellation scenarios.
- Support for concurrency: fibers, async, scheduling, interruption, and coordination primitives (e.g. semaphores, queues)
- Integration with the JVM, Scala versions 2.x and Scala 3, also supporting Scala.js (for JS platforms) in many cases; good cross-platform compilation.
- Backpressure, efficient thread-pool / execution context management, avoiding common pitfalls of blocking operations etc.
- Strong law-based design: typeclasses, laws for correctness, testkit support for verifying properties.
Project Samples
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LibrariesLicense
Apache License V2.0Follow Cats Effect
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