Prolog is an actively used programming language created in 1972.

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Example code from the Hello World Collection:

% Hello World in Prolog

hello :- display('Hello World!') , nl .

Example code from Linguist:

%6.8
subset(Set, Subset) :-
	append(L1, Subset, Set).
powerset(Set, Subset) :-
	bagof(Subset, subset(Set, Subset), Subset).

Example code from Wikipedia:

rule(q0, 1, q0, 1, right).
rule(q0, b, qf, 1, stay).
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Last updated February 11th, 2019