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;;;; License: CC0-1.0
(define-module (net ricketyspace sicp two twentyeight)
#:export (fringe))
(define (fringe x)
(cond ((null? x) '())
((not (pair? x)) (list x))
(else (append (fringe (car x))
(fringe (cdr x))))))
;;; Guile REPL
;;; scheme@(guile-user)> ,use (net ricketyspace sicp two twentyeight)
;;; scheme@(guile-user)> (define x (list (list 1 2) (list 3 4)))
;;;
;;; scheme@(guile-user)> (fringe x)
;;; $12 = (1 2 3 4)
;;; scheme@(guile-user)> (fringe (list x x))
;;; $13 = (1 2 3 4 1 2 3 4)
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