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Editorial Team
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Asked: 2026-05-18T11:23:59+00:00

I want to write a function in lisp that reverses all elements from the

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I want to write a function in lisp that reverses all elements from the list using map functions but I don’t have any idea how to start this.. I think I have to use the built in reverse function somehow..
For example if I have the list (1 2 3 (4 5 6 (7 8 9))) I would get (((9 8 7) 6 5 4) 3 2 1)
or if I had the list(1 2 3 (4 5) (6 7)) I would get ((7 6) (5 4) 3 2 1) ..
Any help is appreciated!

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1 Answer

  1. Editorial Team

    Just a quick answer, not sure about efficiency/elegancy:

    (defun reverse-deeply (list)
   (mapcar #'(lambda (li) 
               (cond
                ((consp li) (reverse-deeply li))
                (t li)))
           (reverse list)))
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