https://effective-haskell.com/solutions/chapter9/the-extended-functor-family.html
Effective Haskell - The Extended Functor Family
effective haskellextendedfunctorfamily
https://effective-haskell.com/solutions/chapter7/building-a-command-line-calculator.html
Effective Haskell - Building a Command Line Calculator
Build a command line tool that will let you do basic arithmetic on a list of numbers. As you work through this exercise you'll get more experience working with...
effective haskellcommand linebuildingcalculator