DART somo la 30 :Jinsi ya kutengeneza setter na geter kwenye OOP
Katika somo hili tutakwenda kujifunza zaidi kuhusu method za getter na setter. Tutakwenda kuona hasa zinavyotumika na zinavyotengenezwa.
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(&qu">...
