Hamsters: A Tiny Scala Utilities Library
summary
Hamsters is a small Scala utility library that provides practical helpers built on standard Either/Option/Future: a Validation that accumulates all errors, FutureOption and FutureEither monad transformers to simplify Future[Option[_]]/Future[Either[_]] patterns, HLists with position- and type-safe head/tail plus type-based lookup, union types and an Enum typeclass. The library uses macros to generate enum helpers and Show instances, supports Scala.js, compiles to about a 5MB artifact, and includes examples and a workshop demonstrating the features.
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chapters (9)
- 0:00Introduction
- 1:49Form validation
- 4:58Option/Future transformers
- 7:28Heterogeneous lists
- 10:18Variance with Disjunction
- 11:45Simplified enums
- 12:49Default values for Option
- 14:13Macros and extensions
- 15:37Q&A
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