effect needs latest state of timer (version 1)

rwieruch · rwieruch · commit 1982518f0ee2 · 2018-11-01T09:54:21.000+08:00
diff --git a/src/useEffect-example/index.js b/src/useEffect-example/index.js
@@ -14,7 +14,7 @@ function App() {
 
       return () => clearInterval(interval);
     },
-    [isOn],
+    [isOn, timer],
   );
 
   const onReset = () => {
