[IanCal]

I really liked this article, in particular the sections around learning things like Functor and Monad (if you haven't read the article, don't worry, it's not a list of new explanations that's why I like it).

A minor wording recommendation:

> better in every measure(lower complexity, speed, readability, extensibility)

Apart from a missing space before the parenthesis, this reads like there was lower complexity, lower speed ...

[danneu]

Could just change "lower complexity" to "simplicity".