DART somo la 30 :Jinsi ya kutengeneza setter na geter kwenye OOP

Unaweza kutengeneza getter method kwa kutumia keyword get na unaweza kutengeneza setter method kwa kutumia keyword  set.  Hapa tutatumia arrow => function. (Rejea somo la aina za function)

class gari {

 String? _aina;

 int? _mwaka;

 // Getter method

 get model => _aina;

 // Setter method

 set model(model) => _aina = model;

 // Getter method

 get year => _mwaka;

 // Setter method

 set year(year) => _mwaka = year;

}

void main() {

 var vehicle = gari();

 vehicle.model = "Toyota";

 vehicle.year = 2023;

 print(vehicle.model);

 print(vehicle.year);

}

Kuvalidate kwa kutumia getter:

Wacha tuone mfano wa validation. Angalia mfano hapo chini, kuna provate properties 2, sasa kwenye property name kama hutaweka kitu utaambiwa no name.

class NoteBook {

 // Private properties

 String _name;

 double _prize;

 // Constructor

 NoteBook(this._name, this._prize);

 // Getter to access private property _name

 String get name {

   if (_name == "") {

     return "No Name";

   }

   return this._name;

 }

 // Getter to access private property _prize

 double get prize {

   return this._prize;

 }

}

void main() {

 // Create an object of NoteBook class

 NoteBook nb = new NoteBook("Apple", 1000);