Scala 3 enum for a terser Option Monad Algebraic Data Type

Published: 06 Dec 2020

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Explore a terser definition of the Option Monad that uses a Scala 3 enum as an Algebraic Data Type.
In the process, have a tiny bit of fun with Scala 3 enums.
Get a refresher on the Functor and Monad laws.
See how easy it is to use Scala 3 extension methods, e.g. to add convenience methods and infix operators.
The diagrams for function composition and Kleisli composition were made using https://q.uiver.app/ by https://twitter.com/varkora.