StatelessWidget in Flutter - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a StatelessWidget in Flutter?

A StatelessWidget is a widget that does not store any state. It builds its UI once and does not change unless its inputs change.

beginner

How do you create a StatelessWidget in Flutter?

You create a class that extends StatelessWidget and override the build method to return the widget tree.

beginner

Why use StatelessWidget instead of StatefulWidget?

Use StatelessWidget when your UI does not need to change dynamically. It is simpler and more efficient for static content.

beginner

What method must you override in a StatelessWidget?

You must override the build(BuildContext context) method to describe the UI.

intermediate

Can a StatelessWidget have mutable variables?

No, a StatelessWidget should not have mutable state because it cannot rebuild itself when data changes.

What happens when the inputs of a StatelessWidget change?

A Nothing, it never rebuilds

B The widget updates its internal state

C The widget rebuilds with new inputs

D The app crashes

A StatelessWidget rebuilds when its inputs (properties) change, but it does not hold any internal state.

Which method do you override to define the UI of a StatelessWidget?

A dispose()

B initState()

C setState()

D build()

The build() method returns the widget tree and defines the UI.

StatelessWidget is best used when:

A UI changes frequently

B UI is static and does not change

C UI depends on user interaction

D You want to store data

StatelessWidget is for static UI that does not change during the app lifecycle.

Which of these is true about StatelessWidget?

A It cannot rebuild itself without new inputs

B It can hold mutable state

C It rebuilds when setState() is called

D It requires a State object

StatelessWidget rebuilds only when its inputs change; it has no State object.

What is the return type of the build method in StatelessWidget?

A Widget

B BuildContext

C State

D void

The build method returns a Widget that describes the UI.

Explain what a StatelessWidget is and when you should use it.

Think about widgets that never change after they are built.

Describe the steps to create a simple StatelessWidget in Flutter.

Focus on the class structure and the build method.