shithub: pprolog

ref: d2a0828140c31514c514b8e4fb9a4d52c389d8fe
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).