/usr/lib/s9fes/memp.scm is in scheme9 2010.11.13-2.
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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 | ; Scheme 9 from Empty Space, Function Library
; By Nils M Holm, 2009
; See the LICENSE file of the S9fES package for terms of use
;
; (memp procedure^2 object list) ==> list | #f
;
; Find the first tail X of LIST for which
;
; (procedure^2 object (car X))
;
; holds. When no such tail exists, return #F.
;
; Example: (memp char=? #\b '(#\a #\b #\c)) ==> (#\b #\c)
(define (memp p x a)
(cond ((null? a)
#f)
((p x (car a))
a)
(else
(memp p x (cdr a)))))
|