Programs as Diagrams: From Categorical Computability to Computable Categories

I posted about a book that was recently published about categorical computability theory [1]. The author has a draft of the book available on the arXiv, which is what this submission is.

As I said in my previous submission, I think this material is useful as a concrete, and from basic principles, introduction to category theory and its application to computation.

[1] https://news.ycombinator.com/item?id=37996607