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  1. split_into_pairs([], []).
  2. split_into_pairs([First, Second | Tail], [[First, Second] | Rest]) :- split_into_pairs(Tail, Rest).
  3.  
  4. :- split_into_pairs([1,2,3,4,5,6],X), write(X).
  5. :- split_into_pairs([1,2,3],X), write(X).
Success #stdin #stdout #stderr 0.02s 6204KB
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stdin
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Standard input is empty
stdout
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[[1, 2], [3, 4], [5, 6]]
stderr
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Warning: /home/hmDVMv/prog.pl:5:
	Goal (directive) failed: user: (split_into_pairs([1, 2, 3], _G367), write(_G367))
https://ideone.com/1ZZ7Dr
language:
Prolog (swi 7.6.4)
created:
11 years ago
visibility:
public

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