[编程申请]：怎样将一个表中元素都变成独一无二的？

Dallas_whu

请教各位大侠，怎样将一个表中元素都变成独一无二的？例如：
(a a b b b c c d e) 变成 (a b c d e)。请指教！

Underway

19. Matt Stachoni
Mar 23 1998, 4:00 pm

In the interests of composing the fastest and most efficient AutoLISP code, I'd be interested in knowing what built-in functions are internally faster or slower than others. I know (entget)'s a dog but  there's no way around that one, I guess.

I suppose you could have coded it

(defun remove-dupes (inlist / out)
   (while (setq x (car inlist))
      (if (not (member x out))
         (setq out (cons x out))
      )
      (setq inlist (cdr inlist))
   )
   (reverse out)
)


Didn't bother to benchmark it, though. Once was enough for me!


Matt

Dallas_whu

谢谢！