Cascade Notation in Dart

cascade.dart

querySelector('#confirm')
  ..text = 'Confirm'
  ..classes.add('important')
  ..onClick.listen((e) => window.alert('Confirmed!'));

cascade2.dart

var button = querySelector('#confirm');
button
..text = 'Confirm'
..classes.add('important')
..onClick.listen((e) => window.alert('Confirmed!'));

cascade3.dart

var button = querySelector('#confirm');
button.classes.add('important')
..onClick.listen((e) => window.alert('Confirmed!'));

normal.dart

var button = querySelector('#confirm');
button.text = 'Confirm';
button.classes.add('important');
button.onClick.listen((e) => window.alert('Confirmed!'));