up

1-js/06-advanced-functions/03-closure/2-counter-object-independent/solution.md

@@ -0,0 +1,24 @@
+
+Surely it will work just fine.
+
+Both nested functions are created within the same outer Lexical Environment, so they share access to the same `count` variable:
+
+```js run
+function Counter() {
+  let count = 0;
+
+  this.up = function() {
+    return ++count;
+  };
+  
+  this.down = function() {
+    return --count;
+  };
+}
+
+let counter = new Counter();
+
+alert( counter.up() ); // 1
+alert( counter.up() ); // 2
+alert( counter.down() ); // 1
+```