Seems like interest in Datalog is high this week, so I thought I'd share a write-up of a minimal Datalog implementation I did a while ago.

Runs in the browser using Hoot (https://spritely.institute/hoot/) which compiles Guile Scheme to WebAssembly.

What scheme is this?

Datalog is a syntactic subset of Prolog[1], which this is... not.

I think the most misunderstood thing about Prolog (and Datalog, the functor-free subset of pure Prolog) is that the syntax is really, really important.

It's like, the whole gimmick of the language. It is designed to efficiently and elegantly query and transform itself. If you lose the syntax you lose all of intermediate and advanced Prolog (and Datalog).

[1]: https://en.m.wikipedia.org/wiki/Datalog