Kellton Flutter Developer Interview Questions and Answers

Stateless widgets are immutable and don't change over time. Stateful widgets can change their state over time.

• Stateless widgets are used for displaying static content.

• Stateful widgets are used for displaying dynamic content.

• Stateless widgets are faster and consume less memory than stateful widgets.

• Stateful widgets have a State object that stores mutable state.

• Examples of stateless widgets include Text, Icon, and Image.

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Stateful widget goes through various stages during its lifecycle.

• Stateful widget is created using createState() method.

• When the widget is inserted into the widget tree, initState() method is called.

• When the widget is updated, didUpdateWidget() method is called.

• When the widget is removed from the widget tree, dispose() method is called.

• build() method is called whenever the widget needs to be rebuilt.

setState is a method used in stateful widgets to update the state of the widget and trigger a rebuild of the UI.

• setState is called with a callback function that updates the state variables.

• The callback function is executed asynchronously.

• The new state values are merged with the old state values.

• The widget is rebuilt with the updated state values.