cheatsheet.md

Cheatsheet

1. Start from dummy main and imports/pragmas prefilled
2. let's write a REST server to manage pets -> main with port, call startServer
3. startServer run port application
4. write application
5. decompose runServer into runServant + runEFf
6. implement handlers as pure ()
7. compile and run the app
8. write a test -> addPet returns [thePet]
9. model business logic as an Eff -> BusinessLogicEffect -> AddPet precanned answer
10. write a test to add a second Pet -> fails, we need a store
11. model the store using an MVar + map of ByteString with encode
12. thread the Store in runEff
13. change tests to return a Right -> we want to handle errors in Storage
14. write a test for failing store
15. implement filaing store as an alternative effect

• scaffold Servant
• types for PetStore (Pet,encode...)
• start at the point where we make a request
• verbalise the fact people asked about Servant + Eff