shithub: pprolog

ref: 9fd0e7fc78740ec3a0a1a5e97d571d0f9d02b85a
dir: pprolog/lists.pl

View raw version 
:- module(lists, []).

% List predicates

length([], 0).
length([_|Tail], Length) :-
	length(Tail, Length0),
	Length is Length0 + 1.

append([], Ys, Ys).
append([X|Xs], Ys, [X|Rest]) :-
	append(Xs, Ys, Rest).