DART

Cascade notation

void main() {
  Person()
    ..name = "John"
    ..age = 30
    ..sex = "Male"
    ..describeMyself();
}

class Person {
  String? name;
  int? age;
  String? sex;

  Person({this.name, this.age, this.sex});

  void describeMyself() {
    print('Hello my name is $name, I am $age years old');
  }
}

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!'));