Use expression function bodies

For functions that contain just one expression, you can use an expression function. The => (arrow) notation is used for expression function.

Do

get width => right - left;
	
Widget getProgressBar() => CircularProgressIndicator(
  valueColor: AlwaysStoppedAnimation<Color>(Colors.blue),
);

Don't

get width {
  return right - left;
}
 
Widget getProgressBar() {
  return CircularProgressIndicator(
    valueColor: AlwaysStoppedAnimation<Color>(Colors.blue),
  );
}