Clojurians Log v2

I bought it, started reading it, and kinda bounced off because it was detailed info about data structures that I didn't plan to implement

https://www.cs.cmu.edu/~rwh/students/okasaki.pdf

CMU hosts the PDF, you could get a sense of the material before deciding to buy

Great, thanks! What was your motivation to read it initially?

I wanted to make persistent data structures inside a graph database

similar to Clojure's storage-sharing persistent collections

very little in Clojure itself (other than the persistent queue) is actually directly related to things in Okasaki, and much more derived from Bagwell's hash array mapped tries

whether Okasaki is worth it depends on your goals - if you want to learn more about the concepts of persistent data structures, then it's obviously a key book in that literature.

I was glad to have read it back when I did