francesco-losciale/haskell-todo-list

Showcases happstack Haskell web library

Haskell Todo List - work in progress

How to run

Pre-requisites:

• To build, you need libpq-dev that can be installed with brew install postgresql (<-- can you improve this???)

Run:

• To run tests, you need Docker Machine

• Compile and build executables: stack build

• Compile and run all tests: stack test

• List the tests you can run individually: stack test --dry-run

• Run an individual test: stack test --test-arguments "--match=SimpleState"

• Run application stack exec haskell-todo-list-exe

• If Hlint is installed, run hlint . in the project root directory

Learnings

• Notes about monads are here https://github.com/francesco-losciale/haskell-state-monad

• Takeaways here

• Useful links and resources here

Want to learn more

• Possible improvements to the code
  • implement Lens on Todo type
  • Use Data.Cache to temporarily cache the list without peristing it - https://hackage.haskell.org/package/cache-0.1.3.0/docs/Data-Cache.html
  • Learn STM and find a use case - curious to see how retry of a blocked transaction works
• Exercises: Haskell patterns minibook: https://kowainik.github.io/posts/haskell-mini-patterns <-- to learn idiomatic code
• Learn Vavr : Java FP, find use cases at work