Tuesday, 19 May, 2020 UTC


In this lesson, we'll begin working with monoids by creating some of our own. Specifically, we will upgrade a previously defined semigroup (`Product`) so that it takes the form of a valid monoid. To ensure that we have a valid monoid, we will wrap up this video by testing `Product` so that it holds the laws of `Right` identity and Left` identity. [Fantasy Land Docs - Monoid](https://github.com/fantasyland/fantasy-land#monoid)