From 09096bfaa15c34ba4c6010cc0765658e6327c19f Mon Sep 17 00:00:00 2001
From: rsiddharth <s@ricketyspace.net>
Date: Sat, 24 Mar 2018 05:54:29 +0000
Subject: net: Add (net ricketyspace sicp one fortythree)

---
 net/ricketyspace/sicp/one/fortythree.scm | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)
 create mode 100644 net/ricketyspace/sicp/one/fortythree.scm

(limited to 'net/ricketyspace')

diff --git a/net/ricketyspace/sicp/one/fortythree.scm b/net/ricketyspace/sicp/one/fortythree.scm
new file mode 100644
index 0000000..f84d17b
--- /dev/null
+++ b/net/ricketyspace/sicp/one/fortythree.scm
@@ -0,0 +1,24 @@
+;;;; Under Creative Commons Attribution-ShareAlike 4.0
+;;;; International. See
+;;;; <https://creativecommons.org/licenses/by-sa/4.0/>.
+;;;;
+
+(define-module (net ricketyspace sicp one fortythree)
+  #:use-module (net ricketyspace sicp one fortytwo)
+  #:export (repeated square))
+
+(define (repeated f n)
+  (cond ((= n 1) (lambda (x) (f x)))
+        (else (sicp-compose f (repeated f (1- n))))))
+
+(define (square x) (* x x))
+
+;;; GNU Guile REPL
+;;;
+;;; scheme@(guile-user)> ,re (net ricketyspace sicp one fortythree)
+;;; scheme@(guile-user)> ((repeated square 1) 5)
+;;; $7 = 25
+;;; scheme@(guile-user)> ((repeated square 2) 5)
+;;; $8 = 625
+;;; scheme@(guile-user)> ((repeated square 3) 5)
+;;; $9 = 390625
-- 
cgit v1.2.3