Cascade notation

// Dart Cascade notation: myObject..someMethod()
querySelector('#confirm')
..text = 'Confirm'
..classes.add('important')
..onClick.listen((e) => window.alert('Confirmed!'));
// can replace (you don’t need the button variable):
var button = querySelector('#confirm');
button.text = 'Confirm';
button.classes.add('important');
button.onClick.listen((e) => window.alert('Confirmed!'));

Source: dart.dev

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