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As the dev doc says, Dart doesn't have the keywords public , protected , and private . If an identifier starts with an underscore (_), it's private to its library. But I found many @protected keywords in Flutter framework. What does the @protected mean?
abstract class InheritedWidget extends ProxyWidget {
const InheritedWidget({ Key key, Widget child })
: super(key: key, child: child);
@override
InheritedElement createElement() => InheritedElement(this);
@protected
bool updateShouldNotify(covariant InheritedWidget oldWidget);
}
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Dart Private Variables In dart, you can declare a variable name with an underscore(_) as a private variable. Private variables are accessed inside the same class, not outside the classes or files. Declared a private variable ie added an underscore before a variable(_) in a class.
Annotations in Dart An annotation is a form of representing syntactic metadata that can be added to our Dart code; in other words, a way of adding extra information to any component in our code, such as class or a method.
The only way to emulate interface in Dart is to create abstract class. That means that in Dart abstract class is mixed with interface.
In Dart, we use the late keyword to declare variables that will be initialized later. These are called non-nullable variables as they are initialized after the declaration. Hence, we use the late keyword. Note: Once we declare a non-nullable late variable, the variable can't be null at runtime.
It's used to provide a hint when members are used outside of subclasses, by the Dart Analyzer.
You can find the issue here.
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