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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 | ; zenlisp example program
; By Nils M Holm, 1998-2007
; See the file LICENSE for conditions of use.
; R6RS Scheme-style EXISTS. This function is like ANY,
; but accepts multiple list arguments:
; (require '~nmath)
; (exists < '(#1 #2 #3) '(#1 #1 #4)) => :t
(define (exists p . a*)
(letrec
((car-of
(lambda (a)
(map car a)))
(cdr-of
(lambda (a)
(map cdr a)))
(exists*
(lambda (a*)
(cond ((null (car a*)) :f)
(t (or (apply p (car-of a*))
(exists* (cdr-of a*))))))))
(exists* a*)))
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