fixes #796

Author: martin-henz

xml/chapter3/section1/subsection3.xml

@@ -1091,22 +1091,20 @@ paul_acc("withdraw", "rosebud")(50); // Withdraws 50, should return 40
       <SNIPPET>
         <EXAMPLE>exercise_3_8_solution_example</EXAMPLE>
       <JAVASCRIPT>
-function make_f(init) {
-    return x => {
-        init = x - init;
-        return init;
-    };
+let v = -0.5;
+function f(x) {
+    v = x + v;
+    return v;
 }
-
-const f = make_f(1/2);
       </JAVASCRIPT>
       </SNIPPET>
 
       <SNIPPET HIDE="yes">
         <NAME>exercise_3_8_solution_example</NAME>
       <JAVASCRIPT>
-display(f(1) + f(0));
-display(f(0) + f(1));
+// try these separately
+display(f(0) + f(1)); // returns 0
+display(f(1) + f(0)); // returns 1
       </JAVASCRIPT>
       </SNIPPET>
     </SOLUTION>