From: Ramakrishnan Muthukrishnan <vu3rdd@gmail.com>
Date: Sun, 11 Dec 2011 04:36:44 +0000 (+0530)
Subject: solution to 4.17
X-Git-Url: https://git.rkrishnan.org/simplejson/class-simplejson.JSONEncoder-index.html?a=commitdiff_plain;h=abdfddb382e309f93a0f8e57708ab70ddc4c3186;p=sicp.git

solution to 4.17
---

diff --git a/src/sicp/ex4_17.rkt b/src/sicp/ex4_17.rkt
new file mode 100644
index 0000000..cfc14e6
--- /dev/null
+++ b/src/sicp/ex4_17.rkt
@@ -0,0 +1,13 @@
+#lang racket
+
+#|
+
+There will be an extra frame because of the `let' statements. 
+
+The lambdas are evaluated only when called. So, if we put all the definitions on the top
+before the statements which actually use them, then we already have 'sumultaneous scope'
+implemented. Infact that is the assumption we had while implementing 4.16. The definitions
+can contain references to other variables not defined yet, because they will be looked up
+only when we call it with a value.
+
+|#
\ No newline at end of file