app.js

@@ -1,6 +1,12 @@
-function display(char1, char2, char3, char4, ...others) {
-    console.log(others);
-    console.log(char1, char2, char3, char4);
+function setupCounter(val) {
+    return function counter() {
+        return val++;
+    }
 }
-let letters = 'abcdefgh';
-display(...letters);
+
+let counter1 = setupCounter(0);
+console.log(counter1());
+console.log(counter1());
+let counter2 = setupCounter(10);
+console.log(counter2());
+console.log(counter2());