Why we can't create getter inside build method whereas we can create method?

Question

On Flutter we can create method inside inside the build method, but why we can't create getter(get).

Minimal reproducible snippet

class A extends StatefulWidget {
  const A({super.key});

  @override
  State<A> createState() => _AState();
}

class _AState extends State<A> {
  int get _foo => 0; // Ok
  @override
  Widget build(BuildContext context) {
    int get _bar => 1;  /// invalid
    return Container();
  }
}

class B extends StatelessWidget {
  const B({super.key});

  @override
  Widget build(BuildContext context) {
    int get _bar => 1; /// invalid
    return Container();
  }
}

I am using flutter_lints: ^3.0.0. Is it possible to create getter inside build method?

Answer 1

Getters can't be declared locally inside a method.

This's because of the intended usage of these getters, it's intended to be encapsulated within the instances of the class in which they are declared.

So, Getters are special methods that provide explicit read access to an object's properties. and must be declared on class level not locally inside a method.

actually, this answer should be long to explore some concepts like encapsulation. However, we can ask some questions that explain why not locally.

How can the object access its getters if they are nested?

suppose it can.

what if the instance method which the getter is declared within is marked as static method not instance?

object can't even see that static method.

So, it must be declared at class level to perform as supposed.