How do you create a constructor for stateful widget flutter?

StatefulWidget instances themselves are immutable and store their mutable state either in separate State objects that are created by the createState method, or in objects to which that State subscribes, for example Stream or ChangeNotifier objects, to which references are stored in final fields on the StatefulWidget …

A builder is a Flutter design pattern in which the construction code of a widget is defined outside of its class . Builder functions are callback interfaces that pass data (often layout-specific) to the parent widget which returns a child based on that data.

StatefulBuilder class Null safety A platonic widget that both has state and calls a closure to obtain its child widget . The StateSetter function passed to the builder is used to invoke a rebuild instead of a typical State’s State. setState.

StatefulBuilder is a widget having a mutable state (whose state can be change) what makes it’s special is its only rebuild the particular widget which is wrapped under the Stateful Builder.

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