Flutter singleton null safety

The _internal construction is just a name often given to constructors that are private to the class (the name is not required to be . _internal you can create a private constructor using any Class.20 Haz 2012

Save. Factory Method is referred as a creational design pattern which provides an interface for creating objects in a superclass, but allows subclasses to alter the type of objects that will be created . Also known as virtual constructors.

_Internal const internal. Used to annotate a declaration which should only be used from within the package in which it is declared, and which should not be exposed from said package’s public API . Tools, such as the analyzer, can provide feedback if.