Scala development

Functional programming in Scala emphasizes immutability, ADTs (algebraic data types), and pure functions. Use sealed traits for ADTs, Either for error handling instead of exceptions, and avoid null and Any. Typelevel libraries like cats and cats-effect provide composable abstractions for functional workflows.

Bloop accelerates compilation and testing cycles by caching and parallelizing builds. This Skill prioritizes bloop over sbt when available, then falls back to sbt. Both tools integrate with sbt configuration, and mandatory commitCheck runs on commits to enforce quality gates.

TDD in Scala starts with writing tests first, then implementing features to pass them. This Skill integrates test-driven-development, code-reviewer, and commit-helper to guide the full workflow: write tests, implement with functional techniques, review code quality, and commit with validation.

Yes. Cats provides functional abstractions like Monad and Applicative; fs2 builds composable streams for data processing. The Typelevel ecosystem is core to this Skill's guidance, enabling robust, type-safe code without throwing exceptions or relying on null.

You need sbt or bloop installed, a working Scala environment, and familiarity with functional programming concepts. This Skill depends on development, test-driven-development, code-reviewer, and commit-helper to provide end-to-end guidance from setup through deployment.

Throw, null, and Any bypass type safety and make code harder to reason about. Either-based error handling, ADTs, and proper typing preserve totality and composability. This Skill enforces these constraints to ensure maintainable, robust Scala applications aligned with functional best practices.