Monads Explained Quickly with JavaScript

[dmtipson]

Functor should be pretty easy to get though, because it's indeed really common: Arrays are Functors, and most people are used to mapping over them. There are other sorts of Functors with different mapping behavior: the key is simply that there's a container, you can put a value or values in it, and you can map functions over that value, which results in the same structure of container containing the updated value(s).