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Languages & runtimes · #prolog
Learn how the Prolog cut (!) prunes search space, distinguishes green from red cuts, and see a worked example that improves performance without altering logic.
A step‑by‑step guide to detect and fix Prolog non‑termination caused by a missing occurs‑check in recursive predicates.
DCGs give Prolog a readable --> syntax for context-free parsers, but they compile to predicates with two extra difference-list arguments. Keep the In/Out contract visible to avoid silent mis-parses and infinite loops.
Discover how Prolog’s tabling feature turns recursive problems like Fibonacci into fast, memoized computations. Learn to enable tabling in SWI‑Prolog, benchmark the speedup, inspect table statistics, and understand the memory trade‑offs.
Tabling in SWI‑Prolog memoizes recursive sub‑goals, turning non‑terminating graph queries into fast, terminating ones. A worked example shows how to declare a path predicate, the performance gains, and practical trade‑offs.
Model Sudoku as a constraint problem in SWI-Prolog with CLP(FD): domains, all_distinct constraints, first-fail labeling, and how to check and debug the result.
Architecture note for a safety-critical configuration solver using Prolog’s CLP(FD): requirements, minimal pure-module design, trust boundary validation, runtime checks, failure modes, and when the design must change.
Learn how Prolog’s tabling caches results to stop infinite recursion, see a simple example, and understand its memory trade‑offs.
Learn how Prolog’s Definite Clause Grammars hide difference‑list plumbing, letting you write clean parsers that also generate sentences, with a worked example and notes on left recursion and performance.