Hi all,
what's the best (less expensive) method to insert elements only at the
head of a list and between first and second element of said list.
But don't insert an element at list-end if the list is of length 1.
I do have:
(define (list-insert-first-and-third lst arg1 arg2)
(if (pair? lst)
(append
(list arg1)
(list (car lst))
(if (pair? (cdr lst))
(list arg2)
'())
(cdr lst))
lst))
(display (list-insert-first-and-third '(1 2 3 4 5) "a" "b"))
--> (a 1 b 2 3 4 5)
This looks clumsy, though.
Any hint for a better code?
Thanks,
Harm
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