Combine data in list

[Scoutr4]

i want to edit the list like this :

Example :
List ; ( 1 2 3 4 5 6 7 8 9)

how do i make the new list?

New List ; ((1 2 3) (4 5 6) (7 8 9))

 

Edited July 30, 2023 by Scoutr4

[Tsuky]

Possible way

(defun l-to-3 (lst / )
  (if lst
    (cons
      (list
        (car lst)
        (cadr lst)
        (caddr lst)
      )
      (l-to-3 (cdddr lst))
    )
  )
)
(mapcar '(lambda (x) (vl-remove nil x)) (l-to-3 (list 1 2 3 4 5 6 7 8 9 10)))

 

[Scoutr4]

Thank you so much @Tsuky

[BIGAL]

There is a lot of list manipulation examples in the Challenges section of the swamp similar to what you were looking for worth having a look.