Merge pull request vasanthk#92 from Pistulls/master

Event handlers short hand example using arrow functions and avoid hav…

patterns/22.event-handlers.md

@@ -75,3 +75,22 @@ Arrow functions auto binds the function with `this`.
 
 Facebook by the way recommend the same technique while dealing with functions that need the context of the same component.
 The binding in the constructor may be also useful if we pass callbacks down the tree.
+
+A short hand example using arrow functions and avoid having to use the constructor:
+
+```javascript
+class Switcher extends React.Component {
+  state = { name: 'React in patterns' };
+
+  render() {
+    return (
+      <button onClick={ this._handleButtonClick }>
+        click me
+      </button>
+    );
+  }
+  _handleButtonClick = () => {
+    console.log(`Button is clicked inside ${ this.state.name }`);
+  }
+}
+```