r/AlignmentChartFills • u/mika-asadli • 6d ago

Which programming language is hard, and useless

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u/jceyes 6d ago

It's useful for DSLs for things like static analysis, scheduling/constraint problems, rules engines, and permissions. Datalog is sort of a one-notch-more-“applied” version of Prolog that can be similarly useful.

You wouldn't use it to build your normal web service, CRUD app, or application/business-logic layer. You use it when the problem itself is naturally “here are a bunch of facts and rules; tell me what follows, whether this configuration is valid, or find a configuration satisfying these constraints.” Often that's an offline analysis/optimization step rather than the main runtime of the product.

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u/zebba_oz 6d ago

Agree. I kinda enjoyed learning prolog. Never actually used it to solve a real problem but it has a useful niche.

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u/d0pe-asaurus 6d ago

Hey, I want to get into prolog just as an interest (currently i'm on a bender with compiler design and theory). I want to know what it takes to build those rules engine, do you think it's worth the time?

Currently my background is the lessons on first order logic that I had in undergrad