Is it possible to invoke setters in class in Dart? - dart

Question

Is it possible to invoke setters which declaired with set keyword in class in Dart?
In the script written below, Dart does not recognize the setters:
class Cat {
String _size = '';
String _color = '';
int _age = 0;
Cat(String initialSize, String initialColor, int initialAge) {
size(initialSize);
color(initialColor);
age(initialAge);
}
// getter and setter fields are started
String get size {
return _size;
}
void set size(String animalSize) {
_size = animalSize;
}
String get color {
return _color;
}
void set color(String animalColor) {
_color = animalColor;
}
int get age {
return _age;
}
void set age(int animalAge) {
_age = animalAge;
}
// getter and setter fields are ended
}
Error: 'size' isn't a function or method and can't be invoked.
Error: 'color' isn't a function or method and can't be invoked.
Error: 'age' isn't a function or method and can't be invoked.

Answer 1

The way you are calling a setter/getter is how you would do an assignment of the field. So your code should be:
size = initialSize;
color = initialColor;
age = initialAge;
This will call the setter of size, color and age.
The point of having getter/setter is to be able to simulate a field but have some logic behind that field other than just direct access to a variable.
Unrelated to the question: I don't know if your class is just an example but your current class could be written as the following:
class Cat {
String size;
String color;
int age;
Cat(this.size, this.color, this.age);
}
Of if you want named parameters:
class Cat {
String size;
String color;
int age;
Cat({required this.size, required this.color, required this.age});
}
It is in general not needed to have getter/setters unless you need to have some logic or want to add restrictions. The great thing about getter/setter in Dart is that they behave like fields so we can just start by having fields and replace the field with a getter and/or setter later if we need to add extra logic.