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chomado/gist:5546190

Forked from anonymous/gist:5546134
Created May 9, 2013 08:11
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gistfile1.lisp
(defun a-ikutu (lst)
(length (filter #'(lambda (x) (eq x 'a)) lst)))
;; filter関数
(defun filter (pred lst)
(cond ((null lst) nil)
((funcall pred (car lst))
(cons (car ls) (filter pred (cdr lst))))
(t (filter pred (cdr lst)))))
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