What is super constructor in flutter?

A key that is unique across the entire app . Global keys uniquely identify elements. Global keys provide access to other objects that are associated with those elements, such as BuildContext. For StatefulWidgets, global keys also provide access to State.

super is used to call the constructor of the base class . So in your example, the constructor of CardTitle is calling the constructor of StatelessWidget .3 Mar 2019

Super Keyword in Dart: In Dart, super keyword is used to refer immediate parent class object . It is used to call properties and methods of the superclass. It does not call the method, whereas when we create an instance of subclass than that of the parent class is created implicitly so super keyword calls that instance.8 Mar 2022

The superclass constructor can only be invoked with the use of the super() constructor. The super() constructor allows a subclass constructor to explicitly call the no arguments and parametrized constructor of superclass .24 May 2021