diff --git a/src/index.js b/src/index.js
index 2984f5b..74a2acd 100644
--- a/src/index.js
+++ b/src/index.js
@@ -1,11 +1,7 @@
 import React from './react'
 import ReactDOM from './react-dom'
 
-class App extends React.Component {
-    render() {
-        return <h1>Hello,World!</h1>;
-    }
-}
+const App = () => <h1>Hello,World!</h1>
 
 ReactDOM.render(
     <App />,