How many types of builders are there in Flutter?

A handle to the location of a widget in the widget tree . This class presents a set of methods that can be used from StatelessWidget. build methods and from methods on State objects. BuildContext objects are passed to WidgetBuilder functions (such as StatelessWidget. build), and are available from the State.

build method Null safety Describes the part of the user interface represented by this widget . The framework calls this method when this widget is inserted into the tree in a given BuildContext and when the dependencies of this widget change (e.g., an InheritedWidget referenced by this widget changes).

Flutter Design Patterns: 18 — Builder.

A builder function is a Flutter design pattern in which widgets provide a callback interface to the widget tree with dynamic (often layout-specific) parameters .