/usr/share/zenlisp/listtoset.l is in zenlisp 2013.11.22-2.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 | ; zenlisp example program
; By Nils M Holm, 1998-2007
; See the file LICENSE for conditions of use.
; Transform a list into a set (a list containing
; only unique elements):
; (list->set '(aa ab ac ad ab aa)) => '(aa ab ac ad)
(define (list->set a)
(letrec
((l->s
(lambda (a r)
(cond ((null a)
(reverse r))
((member (car a) r)
(l->s (cdr a) r))
(t (l->s (cdr a) (cons (car a) r)))))))
(l->s a ())))
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