Prolog Coding Horror | Hacker News

A Hacker News post argues that a system built with Prolog likely failed because it depended on rule order.

It contrasts Prolog’s order-sensitive behavior with Datalog’s goal of deriving only the facts logically implied by the rules and database.

If a Datalog system misses reachable facts or invents extras, the post says the runtime—not the language—should be blamed.

The point is that choosing between Prolog and Datalog matters for predictable, declarative rule evaluation.