Cats Effect: The IO Monad for Scala
summary
Cats Effect shows concrete migration from wrapping side effects to a disciplined stack: IO Monad plus tagless final algebras, Sync/Async/Concurrent type classes, Resource/bracket and fibers for cancellation and parallelism. Implements a tested in‑memory cache with background expiry using Ref and Deferred, benchmarks report good performance, and a “fail‑fast” pattern returns on first failing assessment while other parallel tasks continue and persist their results. Tools used include fs2 and http4s.
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chapters (14)
- 0:00Introduction
- 0:56Gabriel Volpe
- 2:34What are effects
- 4:15referential transparency
- 14:53Recap
- 16:04Generating Charts
- 23:36Composing
- 29:08Error Handling
- 32:02Technical Challenges
- 35:46Use Case
- 37:21Example
- 40:17Implementation
- 41:59Documentation
- 42:52Questions
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