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add memv, assv, member, and assoc

This commit is contained in:
Yuichi Nishiwaki 2013-11-09 16:45:04 +09:00
parent c211d9ffde
commit 71b0f8c686
1 changed files with 29 additions and 0 deletions
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29
piclib/built-in.scm
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@ -104,6 +104,13 @@
list
(memq obj (cdr list)))))
(define (memv obj list)
(if (null? list)
#f
(if (eqv? obj (car list))
list
(memq obj (cdr list)))))
(define (assq obj list)
(if (null? list)
#f
@ -111,6 +118,13 @@
(car list)
(assq obj (cdr list)))))
(define (assv obj list)
(if (null? list)
#f
(if (eqv? obj (caar list))
(car list)
(assq obj (cdr list)))))
(define (list-copy obj)
(if (null? obj)
obj
@ -183,3 +197,18 @@
(else
#f)))
(define (member obj list . opts)
(let ((compare (if (null? opts) equal? (car opts))))
(if (null? list)
#f
(if (compare obj (car list))
list
(member obj (cdr list) compare)))))
(define (assoc obj list . opts)
(let ((compare (if (null? opts) equal? (car opts))))
(if (null? list)
#f
(if (compare obj (caar list))
(car list)
(assoc obj (cdr list) compare)))))