What is BuildContext Flutter?

To create a stateful widget in a flutter, use the createState() method . The stateful widget is the widget that describes part of a user interface by building a constellation of other widgets that represent a user interface more concretely. A stateful Widget means a widget that has a mutable state.

Ephemeral state (sometimes called UI state or local state) is the state you can neatly contain in a single widget .

This method is called after rebuilds and always passes in the old widget as an argument . This gives you a chance to check if Flutter should rebuild or not. For example, if your new widget is rebuilt with the same data, then there’s no need to make Flutter do the expensive work.

In flutter, the inherited widget is a base class that allows those classes to extend the information under the tree from it. Inherited widgets are also a kind of state management technique. It works by telling registered build references when a change occurs .