This topic is for the [Data.List.Extras] exercise in the [Haskell Fundamentals] trail. Post any questions, corrections, or pointers you have to share with other Upcase subscribers.
[Data.List.Extras]: https://exercises.upcase.com/exercises/data-list-extras
[Haskell Fundamentals]: Learn Haskell Fundamentals | Haskell Online Tutorial by thoughtbot