solution of ex 3.10 added; fixes #621

Author: martin-henz

static/img_javascript/ex3-10-solution.png

@@ -660,6 +660,14 @@ W2(80);
     </SPLITINLINE>
     create objects with the same behavior.  How do the environment structures
     differ for the two versions?
+    <SOLUTION>
+      <IMAGE src="img_javascript/ex3-10-solution.png"/>
+      <UL>
+	<LI>Black shows the environment structure of function in exercise 3.10</LI>
+	<LI>Green shows differences in environment structure of original
+	(where <JAVASCRIPTINLINE>make_withdraw</JAVASCRIPTINLINE> is replaced with the figure 3.9 version)</LI>
+      </UL>
+    </SOLUTION>
     <LABEL NAME="ex:local-state-variable"/>
   </EXERCISE>