fixes #862 (#1036)

Author: martin-henz

static/img_javascript/ex-3-14-sol-1.png

@@ -945,6 +945,33 @@ const w = mystery(v);
     What would be printed as the values of <SCHEMEINLINE>v</SCHEMEINLINE>
     and <SCHEMEINLINE>w</SCHEMEINLINE>?
     <LABEL NAME="ex:mystery"/>
+    <SOLUTION>
+      (provided by GitHub user jonathantorres)
+      The application <JAVASCRIPTINLINE>mystery(x)</JAVASCRIPTINLINE> will
+      reverse the list <JAVASCRIPTINLINE>x</JAVASCRIPTINLINE> in-place.
+      Initially
+      <JAVASCRIPTINLINE>v</JAVASCRIPTINLINE> looks like this:
+      
+      <FIGURE src="img_javascript/ex-3-14-sol-2.png">
+	<LABEL NAME= "ex:3-14-sol-1"/>
+      </FIGURE>
+
+      After evaluating       
+      <JAVASCRIPTINLINE>const w = mystery(v);</JAVASCRIPTINLINE>
+      the values of
+      <JAVASCRIPTINLINE>v</JAVASCRIPTINLINE> and
+      <JAVASCRIPTINLINE>w</JAVASCRIPTINLINE> become:
+      
+      <FIGURE src="img_javascript/ex-3-14-sol-2.png">
+	<LABEL NAME= "ex:3-14-sol-2"/>
+      </FIGURE>
+
+      The function <JAVASCRIPTINLINE>display</JAVASCRIPTINLINE>
+      prints <JAVASCRIPTINLINE>["a", null]</JAVASCRIPTINLINE> for
+      <JAVASCRIPTINLINE>v</JAVASCRIPTINLINE> and
+      <JAVASCRIPTINLINE>["d", ["c", ["b", ["a", null]]]]</JAVASCRIPTINLINE> for
+      <JAVASCRIPTINLINE>w</JAVASCRIPTINLINE>.
+    </SOLUTION>
   </EXERCISE>
 
   <INDEX>mutable data objects<SUBINDEX>list structure<CLOSE/></SUBINDEX></INDEX>