In Dart, we can define a class and its properties using getters and setters. Here are some examples of how to use get/set in a class:
1. Basic Getter and Setter:
class Person {
String _name;
String get name => _name;
set name(String value) => _name = value;
}
void main() {
final person = Person();
person.name = 'John Doe';
print(person.name); // Output: 'John Doe'
}
In the above example, the Person class has a private property _name. The name getter returns the value of _name, and the name setter sets the value of _name.
2. Computed Properties:
class Rectangle {
double _width;
double _height;
double get area => _width * _height;
set width(double value) => _width = value;
set height(double value) => _height = value;
}
void main() {
final rectangle = Rectangle();
rectangle.width = 5;
rectangle.height = 10;
print(rectangle.area); // Output: 50
}
In the above example, the Rectangle class has private properties _width and _height. The area getter calculates the area of the rectangle based on _width and _height. The width and height setters set the values of _width and _height.
3. Read-Only Properties:
class Circle {
final double radius;
Circle(this.radius);
double get area => math.pi * math.pow(radius, 2);
}
void main() {
final circle = Circle(5);
print(circle.area); // Output: 78.53981633974483
}
In the above example, the Circle class has a read-only property radius, which is set in the constructor. The area getter calculates the area of the circle based on radius.
Overall, getters and setters provide flexibility and encapsulation in object-oriented programming and are essential tools for class design in Dart.