Sample code for 'Learn Dart Before You Flutter' blog post on Medium (Complete)

main.dart

class Order {
  // private properties
  int _id;
  String _reference;
  DateTime _date;
  
  // public properties
  String code;
  String from;
  List<String> bookings;
 
  Order(this._id, this._reference, this._date);
  Order.withDiscount(this._id, this._reference, {this.code}) {
    _date = new DateTime.now();
  }
  
  // Using doc strings to save the multiple linebreaks(\n)
  String getInfo() => '''
Your order information:
-------------------------------
  Id: $_id
  Reference: $_reference
  Date: $_date
-------------------------------
''';
  
  void printInfo() => print(getInfo());
}

void main() {
  Order order1 = new Order.withDiscount(1, 'ref1', code: 'SPECIALDISCOUNT')
    ..from = 'Jermaine Oppong'
    ..bookings = ['booking1', 'booking2', 'booking3']
    ..printInfo();
}