Google Flutter App Development 4

Question 1

How do you navigate to a new screen using the imperative Navigator API?

Accepted Answer

Navigator.push()

Answer

Navigator.push() adds a new route onto the navigation stack.

Question 2

Which widget makes a long list scrollable while building items lazily on demand?

Accepted Answer

ListView.builder

Answer

ListView.builder lazily constructs items only as they scroll into view.

Question 3

Which keyword pair is used in Dart to handle a Future asynchronously and wait for its result?

Accepted Answer

async/await

Answer

Marking a function async lets you await Futures without blocking.

Question 4

Which widget rebuilds its UI in response to a stream of asynchronous data?

Accepted Answer

StreamBuilder

Answer

StreamBuilder listens to a Stream and rebuilds on each emitted event.

Question 5

What does Navigator.pop() do?

Accepted Answer

Removes the current route and returns to the previous screen

Answer

pop() removes the top route, revealing the screen beneath it.

Google Flutter Practice Test