Cats

Lesson in the Scala Roadmap · Stage 16: Ecosystems

Last updated 14 September 2026

What is Cats?

Cats provides core abstractions for functional programming in Scala. It aims to be modular, approachable, and efficient, while providing a foundation for an ecosystem of pure, typeful libraries. Cats Effect, a part of the Cats ecosystem, offers a pure asynchronous runtime for Scala, enabling developers to build scalable and resilient applications. The ecosystem includes libraries for streaming frameworks, database layers, HTTP servers and clients, and more. Resources

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Cats: common questions

Can I learn Cats in Hindi?

This lesson is written in English. Once you sign in, open it in the interactive course and ask the AI tutor to explain Cats in Hindi or Hinglish. The tutor answers from this lesson’s own text, so it stays on the syllabus, and it runs on your own Google, OpenAI or Anthropic key.

Is this Cats tutorial for beginners?

It is lesson 82 of 165 in the free Scala roadmap, in stage 16, Ecosystems. If you are new to Scala, start from stage 1 and come back here in order; if you already know the earlier stages, this lesson stands on its own.