I need to write a program in swi-prolog that removes the second value of

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Editorial Team

Asked: June 2, 20262026-06-02T09:14:58+00:00 2026-06-02T09:14:58+00:00

I need to write a program in swi-prolog that removes the second value of a list.
thanks!

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Editorial Team · Answer 1 · 2026-06-02T09:14:59+00:00

Editorial Team

I think it could be as easy as:

remove2nd([], []).
remove2nd([X], [X]).
remove2nd([X, Y|Z], [X|Z]).

where you use it as:

remove2nd([1,2,3], X).

and gives you

X = [1, 3].

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