hffp-book

This repository contains source code, exercises, related topics and some additional material that I've got (directly or indirectly) from the amazing Haskell programming from first principles book.

Places worth to check

There is a lot of random unstructured stuff here, but there are a few good places to check:

The base library definitions and implementations:

• Monoid, Functor, Applicative, Monad, Foldable and Traversable class definitions
• Identity
• Constant
• Maybe
• Either
• Tuple
• List
• Tree
• Function

Reader and State:

• Visualizing Reader
• Visualizing State (+quick batch)

Parsers:

• Semantic version parser
• Activity log file parser
• IPv4/IPv6 address parser

Monad transformers:

• MaybeT, ExceptT, ReaderT, StateT instances
• Scotty ActionT breakdown
• HitCounter (scotty, ReaderT, IORef)
• Morra game

Exceptions:

• Exception hierarchy

Others:

• Very simple TCP based server that uses SQLite and RWST monad