Hands-On Category Theory by James Earl Douglas.
From the webpage:
James explores category theory concepts in Scala REPL. This is the first version of the video, we have a separate screen capture and will publish a merged version later, with a reference here.
I don’t often see “hands-on” and “category theory” in the same sentence, much less in a presentation title. 😉
An interesting illustration of category theory being used in day to day programming.
See: Hands-On Category Theory at Github for notes on the presentation.
Perhaps this will pique your interest in category theory!