From 49a044d75ec5b892019728bdc1d36f766c9d5ff2 Mon Sep 17 00:00:00 2001
From: Ramakrishnan Muthukrishnan <vu3rdd@gmail.com>
Date: Fri, 23 Jul 2010 01:22:19 +0530
Subject: [PATCH] solution to 2.31

---
 src/sicp/ex2_31.clj | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)
 create mode 100644 src/sicp/ex2_31.clj

diff --git a/src/sicp/ex2_31.clj b/src/sicp/ex2_31.clj
new file mode 100644
index 0000000..e784ca8
--- /dev/null
+++ b/src/sicp/ex2_31.clj
@@ -0,0 +1,16 @@
+(ns sicp.ex2_31
+  (:use [clojure.test]))
+
+(defn tree-map [func tree]
+  (map (fn [sub-tree]
+	 (if (seq? sub-tree)
+	   (tree-map func sub-tree)
+	   (func sub-tree)))
+       tree))
+
+(defn square-tree [tree]
+  (tree-map #(* % %) tree))
+
+(deftest test-tree-map-with-sq
+  (are [x y] [= x y]
+       (square-tree '(1 (2 (3 4) 5) (6 7))) '(1 (4 (9 16) 25) (36 49))))
-- 
2.45.2