this post was submitted on 11 May 2026
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Prolog Basics Explained with Pokémon (unplannedobsolescence.com)
submitted 1 month ago* (last edited 1 month ago) by AernaLingus@hexbear.net to c/programming@hexbear.net
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This blog post introduces the basics of Prolog, then motivates and describes a project the author created where they built a Prolog database that allows them to easily make incredibly specific queries about Pokémon (which would be unwieldy in a relational database query language like SQL). For an idea of how powerful it is, here's one which "finds all the Special moves that Tornadus learns which are super-effective against any member of Justin’s team" (the Prolog database was set up to help the author in planning their teams for a Pokémon draft tournament):

?- justin(Target), learns(tornadus, Move), super_effective_move(Move, Target), move_category(Move, special).
   Target = charizardmegay, Move = chillingwater
;  Target = terapagosterastal, Move = focusblast
;  Target = alomomola, Move = grassknot
;  Target = scizor, Move = heatwave
;  Target = scizor, Move = incinerate
;  Target = runerigus, Move = chillingwater
;  Target = runerigus, Move = darkpulse
;  Target = runerigus, Move = grassknot
;  Target = runerigus, Move = icywind
;  Target = screamtail, Move = sludgebomb
;  Target = screamtail, Move = sludgewave
;  Target = trapinch, Move = chillingwater
;  Target = trapinch, Move = grassknot
;  Target = trapinch, Move = icywind
;  false.
?-
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