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;;;; License: CC0-1.0
(define-module (net ricketyspace sicp two thirtyfive)
#:export (count-leaves-acc))
(define (accumulate op initial sequence)
(if (null? sequence)
initial
(op (car sequence)
(accumulate op initial (cdr sequence)))))
(define (count-leaves-acc t)
(accumulate + 0
(map (lambda (p)
(cond ((pair? p)
(count-leaves-acc p))
(else 1)))
t)))
;;; Guile REPL
;;;
;;; scheme@(guile-user)> ,use (net ricketyspace sicp two thirtyfive)
;;; scheme@(guile-user)> (count-leaves-acc '(1 3 (5 7) 9))
;;; $11 = 5
;;; scheme@(guile-user)> (count-leaves-acc '((7)))
;;; $12 = 1
;;; scheme@(guile-user)> (count-leaves-acc '(1 (2 (3 (4 (5 (6 7)))))))
;;; $13 = 7
;;; scheme@(guile-user)>
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