This repo serves as a place to practice functional programming in Java and to understand functional programming by building minimal versions of known Haskell-concepts in Java. Multiple FP-libraries exist for Java, but building these concepts myself help me learn them better.

The repo uses:

• Algebraic Data Types
• Sealed classes and interfaces
• Exhaustive pattern matching
• Unnamed patterns and variables
• Records
• Value types

Todo's:

• Either a b = Left a | Right b
• Maybe a = Just a | Nothing
• Lenses
• Prisms
• Traversables
• Monads
• Applicatives
• Functors
• Monoids
• Semigroups
• Partial functions

Haskell books I read:

• The Haskell Book
• Haskell in Depth

Video's

• Josh Block about ?super vs ?extend (wildcards): https://youtu.be/V1vQf4qyMXg?t=1497