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zkessin/split.pl

Last active August 29, 2015 14:04
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split.pl
%-*- Prolog -*-
split(Head, Tail, HeadLength, FullList) :-
length(Head, HeadLength),
append(Head, Tail, FullList).
?- split(H,T, 3, [a,b,c,d,e,f,g,h,i,j,k,l]).
H = [a, b, c],
T = [d, e, f, g, h, i, j, k, l].
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zkessin commented Aug 18, 2014

So what is going on here?

Basicly given a List, Full List and a length it is broken into sub lists of which the first half is the specified length, and he 2nd is the rest. This works because append can break a list apart, and length can cause it to backtrack until it finds the Head it wants

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