How do getters and setters change properties in Dart?

Question

I am struggling with the concept of getters and setters in Dart, and the more I read, the more I cannot grasp the underlying purpose. Take for example the following code:

Answer 1

Instance variables in Dart have implicit getters and setters. So for your example code, it will operate in exactly the same way, since all you have done is changed from an implicit getter and setter to an explicit getter and setter.

The value of explicit getters and setters is that you don't need to define both if you don't want. For instance we can change your example to only define a getter:

main() {
    Car car = new Car();
    print(car.doors);  // 4
    car.doors = 6; // Won't work since no doors setter is defined
}

class Car {
    int _doors = 4;
    int get doors => _doors;
}

Additionally, you can also add extra logic in a getter or setter that you don't get in an implicit getter or setter:

class Car {
    int _doors = 4;
    int get doors => _doors;
    set doors(int numberOfDoors) {
      if(numberOfDoors >= 2 && numberOfDoors <= 6) {
        _doors = numberOfDoors;
      }
    }
}