Write a program in Prolog to implement vanish(R,L,N) where R denotes the element whose all occurrences has to be remove from list L to obtain list N

Question

Write a program in Prolog to implement vanish(R,L,N) where R denotes the element whose all occurrences has to be remove from list L to obtain list N.

I’m voting to close this question because this is a boot camp Prolog exercise; some effort is required. — David Tonhofer

Corentin Berteaux Corentin Berteaux · Accepted Answer · 2020-05-29T19:37:15

This should work :

vanish(_,[],[]).
vanish(E,[E|Ls],N) :- vanish(E,Ls,N).
vanish(E,[L|Ls],[L|Ns]) :- L\=E, vanish(E,Ls,Ns).