I found this one quite approachable: https://hseeberger.wordpress.com/2010/11/25/introduction-to-category-theory-in-scala/ https://hseeberger.wordpress.com/201

I found this one quite approachable: https://hseeberger.wordpress.com/2010/11/25/introduction-to-category-theory-in-scala/ https://hseeberger.wordpress.com/2010/11/25/introduction-to-...