Michele Riva

Explaining Monoids to the 10 years old me

A Monoid is a set that is closed under an associative binary operation and has an identity element. Wait, what? Let’s explain this to the 10 years old me!

Photo by Ashim D’Silva on Unsplash

Some years ago, I started to code using the functional paradigm in Node.js and Elixir. When you try to switch from a non-pure functional language to a pure one (such as Haskell), you can find some scary concepts like Functors (we talked…