He really hits on a core programming challenge: the impedance mismatch between hierarchical and relational data. Functional programming excels at working with hierarchical data through recursion, while logic programming is tailored toward relational.

is there a way to watch this without a login? super interested

Unfortunately, not that I can see. It’s excellent though, probably worth the log in (you can signup via GitHub and/or Twitter).

oh I assumed it was paid content

Nope, just authorize to sign in with GitHub.