Dart 4. Function, Class & Method

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Dart 4. Function, Class & Method

Created with <3 with dartpad.dev.

main.dart

void main() {
  double kuadrat(double n) {
    return n * n;
  }
  
  print(kuadrat(20));
  
  var spacecraft = Spacecraft("Roket 101", launched: DateTime.tryParse("2022-01-02"));
  spacecraft.launchDate = "2021-01-02";
  spacecraft.describe();
}

class Spacecraft {
  // properties
  String name;
  DateTime? launched;
  
  // getter
  int? get launchYear => launched?.year;
  
  // setter
  set launchDate(String date) {
    launched = DateTime.tryParse(date);
  }
  
  // constructor
  Spacecraft(this.name, {this.launched}) {
    // di sini inisialisasi
  }
  
  //method
  void describe() {
    print('Spacecraft "$name" ${launched == null
          ? "belum meroket"
          : "sudah meroket pada $launchYear"}');
  }
}