Re: [Newbie] passing keyword argument

On 2024-07-18, B. Pym <Nobody447095@here-nor-there.org> wrote:

Carl Taylor wrote:
>

Here's a LOOP version of an index constructor.
 
(defun make-index-list (obj seq &key (test #'eql))
   (loop for p = (position obj seq :test test :start (if p (1+ p) 0))
           while p
           collect p))
 
(compile *)
 
CL-USER 18 >
(make-index-list
     '(0 1)
     '(a (6 2 z) (0 1) (1 2 3 4) (q w e r t y) (0 1) (foo) bar)
     :test #'equal)
 
(2 5)

>
Gauche Scheme
>
(define (make-index-list obj seq :optional (test equal?))
  (filter-map
    (lambda(x i) (and (test obj x) i))
    seq
    (lrange 0)))
>
(make-index-list
  '(0 1)
  '(a (6 2 z) (0 1) (1 2 3 4) (q w e r t y) (0 1) (foo) bar))
>
 ===>
(2 5)

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1> (where (op equal '(0 1)) '(a (6 2 z) (0 1) (1 2 3 4)
                             (q w e r t y) (0 1) (foo) bar))
(2 5)

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