Updated Future Builder widget

lib/screens/future_builder.dart

@@ -33,29 +33,36 @@ class _FutureBuilderWidgetState extends State<FutureBuilderWidget> {
       ),
       body: Center(
         child: FutureBuilder<Demo>(
-          ///if future is null then API will not be called as soon as the screen
+          ///If future is null then API will not be called as soon as the screen
           ///loads. This can be used to make this Future Builder dependent
           ///on a button click.
           future: _isButtonClicked ? getDemoResponse() : null,
           builder: (context, snapshot) {
             switch (snapshot.connectionState) {
 
-              ///when the future is null
+                ///when the future is null
               case ConnectionState.none:
                 return Text(
                   'Press the button to fetch data',
                   textAlign: TextAlign.center,
                 );
+
               case ConnectionState.active:
+
+                ///when data is being fetched
               case ConnectionState.waiting:
                 return CircularProgressIndicator(
                     valueColor: AlwaysStoppedAnimation<Color>(Colors.blue));
+
               case ConnectionState.done:
+                ///task is complete with an error (eg. When you
+                ///are offline)
                 if (snapshot.hasError)
                   return Text(
                     'Error:\n\n${snapshot.error}',
                     textAlign: TextAlign.center,
                   );
+                ///task is complete with some data
                 return Text(
                   'Fetched Data:\n\n${snapshot.data.title}',
                   textAlign: TextAlign.center,