Google Flutter Essentials 3

Question 1

What is the key difference between StatelessWidget and StatefulWidget?

Accepted Answer

StatefulWidget can rebuild in response to changing internal state

Answer

StatelessWidget is faster to compile

Answer

StatefulWidget cannot have children

Answer

StatelessWidget requires a State object

Question 2

Which method triggers a rebuild of a StatefulWidget after state changes?

Accepted Answer

setState()

Answer

rebuild()

Answer

update()

Answer

refresh()

Question 3

Which widget arranges its children vertically?

Accepted Answer

Column

Answer

Row

Answer

Stack

Answer

Wrap

Question 4

Which widget arranges its children horizontally?

Accepted Answer

Row

Answer

Column

Answer

ListView

Answer

Center

Question 5

Which property controls spacing of children along the main axis?

Accepted Answer

mainAxisAlignment

Answer

crossAxisAlignment

Answer

textDirection

Answer

verticalDirection

Question 6

What is the lifecycle method called once when a State object is inserted into the tree?

Accepted Answer

initState()

Answer

build()

Answer

dispose()

Answer

didUpdateWidget()

Question 7

Which method should release resources like controllers when a widget is removed?

Accepted Answer

dispose()

Answer

deactivate()

Answer

remove()

Answer

close()