Re: MAP (and variants) vs LOOP - Popular opinion observation?

Nathan Baum wrote:

Then suppose you later need the loop/map to collect some of the values
under certain conditions. You might have
 
   (loop for x in (get-list)
         for i from 0
         do (format t "~A - ~A~%" i x)
         if (test x)
         collect (foo x))

Gauche Scheme

(filter-map
  (lambda (x i)
    (print i " - " x)
    (and (odd? x) (square x)))
  '(0 2 3 5 6 9)
  (liota))

  ===>
0 - 0
1 - 2
2 - 3
3 - 5
4 - 6
5 - 9
(9 25 81)