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-rw-r--r--net/ricketyspace/sicp/two/eighteen.scm14
1 files changed, 14 insertions, 0 deletions
diff --git a/net/ricketyspace/sicp/two/eighteen.scm b/net/ricketyspace/sicp/two/eighteen.scm
new file mode 100644
index 0000000..f2ac60e
--- /dev/null
+++ b/net/ricketyspace/sicp/two/eighteen.scm
@@ -0,0 +1,14 @@
+;;;; License: CC0-1.0
+
+(define-module (net ricketyspace sicp two eighteen)
+ #:use-module (net ricketyspace sicp two seventeen)
+ #:export (sicp-reverse))
+
+(define (sicp-append list1 list2)
+ (if (null? list1)
+ list2
+ (cons (car list1) (sicp-append (cdr list1) list2))))
+
+(define (sicp-reverse items)
+ (cond ((null? items) '())
+ (else (sicp-append (sicp-reverse (cdr items)) (list (car items))))))