Some logic programming languages like Datalog or ASP (Answer Set Programming) are known as purely declarative languages. These languages allow statements about what the program should accomplish.

Prolog is a logic programming language developed in the early 1970s that is about objects and relationships between objects. It aims to be a declarative programming language, i.e. Prolog programs ...

Tau Prolog is a Prolog interpreter fully implemented in JavaScript. Tau Prolog is not just an implementation of the logic programming resolution mechanism, but a complete Prolog interpreter.