I really like how this article builds up from a simple real life use case.
Shameless plug for my own article that did something similar about a week ago: https://medium.com/@ameltzer91/an-easy-to-understand-monad-g...
Shameless plug for my own article that did something similar about a week ago: https://medium.com/@ameltzer91/an-easy-to-understand-monad-g...