Example of constructor in Dart

main.dart

void main() {
  Human mark = Human(186);
  Human elon = Human(169);
  print(mark.height);
  print(elon.height);
}

class Human {
  int height;
  Human(int height) {
    this.height = height;
  }
}

void main() {
  Human mark = Human(height: 186);
  Human elon = Human(height: 169);
  print(mark.height);
  print(elon.height);
}

class Human {
  int height;
  Human({this.height});
}