Re: I still don't get MAPCAN

Ken Tilton wrote:

MAPCAN is terribly useful when you want to collect only some things:
>
(defun find-interesting (huge-list)
 (mapcan #'(lambda (e) (if (interestingp e) (list e) nil)) huge-list))

Why wasn't it simply:

(mapcan (lambda (e) (if (interestingp e) (list e) nil)) huge-list))

Users of CL (COBOL-Like) are extremely eager to make their
code as ugly as possible.

 
ick.
 
  (loop for e in huge-list when (interestingp e) collect e)

Ick.

Scheme:

(filter interesting? huge-list)