alt Hacker News> In short, "Here are my gripes about Prolog, a language that I don't understand."
> this article has the flavor of an impatient newbie getting frustrated because he can't be bothered to read the documentation.
The author has written about Prolog in a positive light before (and linked to it in the post), I don't get the impression that these are all "the author doesn't understand what they're doing".
Their first complaint, that "strings are not standardised, so code working with strings in SWI-Prolog is not compatible with Scryer Prolog", seems an appropriate thing to be unhappy about (unless the author is just wrong?).
Your response to their gripe about \+ being "not provable" instead of "negation" notes it's a subtle difference, and that Prolog differs from pure logic there.
The author even notes that doing due diligence, they found a solution to a complaint they had. This doesn't strike me as "can't be bothered to read the documentation".
>> Code logic is expressed entirely in rules, predicates which return true or false for certain values.
Open any Prolog programming textbook (Clocksin & Mellish, Bratko, Sterling & Shapiro, O'Keefe, anything) and the first thing you learn about Prolog is that "code logic" is expressed in facts and rules, and that Prolog predicates don't "return" anything.
The confusion only deepens after that. There are no boolean values? In an untyped language? Imagine that. true/0 and false/0 are not values? In a language where everything is a predicate? Imagine that. Complete lack of understanding that "=" is a unification operator, and that unification is not assignment, like, really, it's not, it's not just a fancy way to pretend you don't do assignment while sneaking it in by the backdoor to be all smug and laugh at the noobs who aren't in the in-group, it's unification, it doesn't work as you think it should work if you think it should work like assignment because everything is immutable so you really, really don't need assignment. Complete misunderstanding of the cut, and its real dangers, complete misunderstanding of Negation as Failure, a central concept in logic programming (including in ASP) and so on and so on and so on and on.
The author failed to do due diligence. And if they've written "in a positive light" about Prolog, I would prefer not to read it because I'll pull my remaining hair out, which is not much after reading this.