https://github.com/MostlyAdequate/mostly-adequate-guide https://github.com/MostlyAdequate/mostly-adequate-guide is also didactic but goes into more details, and

https://github.com/MostlyAdequate/mostly-adequate-guide https://github.com/MostlyAdequate/mostly-adequate-guide is also didactic but goes into more details, and is not Haskell-specific (IIRC functors, map and so forth are all defined in JavaScript)