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A mini Scala utility library. Compatible with functional programming beginners. For the JVM and Scala.js.

It may help you understand how to use - and how to implement (looking at the code) - some popular functional programming features. Il also provides some useful utilities.

Hamsters "full" lib is compatible with Scala 2.11 and 2.12. Some parts of the lib, that are not relying on Scala Meta macros are compatible with 2.13 and extracted in their own repository.

Hamster logo

Currently, Hamsters supports :

  • Data validation

  • Default values for options (orEmpty)

  • Enum typeclass

  • Future Squash (simplifications for nested types)

  • HLists

  • Lens

  • mapN

  • Memoization

  • Monad transformers

  • NonEmptyList

  • Retry

  • Sealed traits children listing

  • Show (better toString)

  • Union types

Install as dependency

libraryDependencies ++= Seq(
  "io.github.scala-hamsters" %% "hamsters" % "3.1.0"

For Scala.js :

libraryDependencies ++= Seq(
  "io.github.scala-hamsters" %%% "hamsters" % "3.1.0"


See hamsters-extensions for more information.


You can find the API documentation here.

Special thanks

To Laurence Beillaux who created the Hamsters logo.