Compose List and Grid Quiz

Welcome to the quiz on “Lists and Grids in Jetpack Compose”! This quiz will test your understanding of how to use different list and grid components in Jetpack Compose, including the differences between standard and lazy lists, enabling scroll behavior, and using advanced features like sticky headers and programmatic scrolling. You’ll also explore the use of LazyColumn, LazyRow, and LazyVerticalGrid for efficient rendering of large sets of data.

What is the purpose of the rememberCoroutineScope() function in Compose?

To declare variables that need to persist through recompositions.

To create a scope that runs outside of Compose recompositions.

To launch coroutines that are aware of the lifecycle of Compose recompositions.

To manage and remember the state of lists and grids.

None

What is the primary function of rememberScrollState() in Compose?

To create a state object for remembering scroll position.

To enable horizontal scrolling in lists.

To create a static list with fixed scrolling.

To store the number of items in a list.

None

Which of the following functions is used to add indexed items to a LazyColumn?

itemsIndexed()

indexedItems()

lazyItems()

itemWithIndex()

None

What does the animateScrollToItem() function do in a LazyColumn?

Creates a new composable at the specified index.

Scrolls to the last item in the list.

Smoothly scrolls to a specified item using its index.

Resizes the items in the list to fit the screen.

None

Which of the following is NOT true about the LazyVerticalGrid composable in Compose?

It automatically makes the grid items scrollable.

It requires you to specify a ScrollState for vertical scrolling.

It is designed for efficiently displaying large sets of items in a grid format.

It can create grids with adaptive or fixed cell sizes.

None

Which method would you use to smoothly scroll a LazyColumn to a specific item?

animateScrollToItem(index)

smoothScrollTo(index)

scrollToItem(index)

scrollTo(index)

None

When should you use LazyColumn instead of a standard Column for a list?

When the list items are all the same size.

When the list contains fewer than 10 items.

When the list is dynamically changing or contains a large number of items.

When the list must be displayed in a fixed size container.

None

What is the benefit of using stickyHeader() in a LazyColumn?

It allows items to stay visible while scrolling past their original position.

It optimizes the performance of list items.

It automatically makes the list items scrollable.

It changes the orientation of the list to horizontal.

None

Which function allows you to add a single item to a LazyColumn in Compose?

listItem()

add()

singleItem()

item()

None

10.

How can you enable vertical scrolling in a Column-based list in Compose?

By setting the isScrollable parameter to true.

By using the scrollableColumn() function.

By applying the verticalScroll() modifier with a ScrollState.

By using the LazyColumn composable.

None

11.

Which of the following is true about LazyVerticalGrid in adaptive mode?

It requires each cell to have a specific height and width.

It sets a fixed number of columns based on the screen width.

It does not support scrolling by default.

It calculates the number of columns based on available space and a specified minimum cell size.

None

12.

What is a key advantage of using LazyListScope in Compose?

It supports multi-threaded list rendering.

It offers better performance for small lists.

It allows precise control over scroll direction.

It provides functions like item() and items() for efficiently adding list items.

None

13.

Which property of LazyListState can be used to detect the current scroll position?

currentItemIndex

scrollIndex

scrollState

firstVisibleItemIndex

None

14.

What is the primary advantage of using LazyColumn and LazyRow for displaying lists in Compose?

They improve performance by creating only visible items and destroying those that scroll out of view.

They provide better styling options than standard Row and Column components.

They automatically group list items into different sections.

They allow items to be displayed without requiring composables.

None

15.

How can you create a grid with a fixed number of columns using LazyVerticalGrid?

By setting the columnCount parameter.

By applying a gridModifier() to the LazyVerticalGrid.

By setting the adaptiveSize property.

By using GridCells.Fixed with a specified number.

None

16.

What happens if you use a Column without a ScrollState and the items exceed the viewable area?

The Column automatically scrolls the items.

The Column switches to a LazyColumn mode.

The Column clips the overflowed items.

The Column displays a scroll bar for navigation.

None

17.

How does LazyColumn handle lists compared to a standard Column?

It requires a ScrollState to manage scrolling.

It preloads all items into memory for faster rendering.

It requires all items to be rendered as Text composables.

It creates only the visible items and recycles them as they scroll out of view.

None

18.

What role does the LazyListState play in a LazyColumn or LazyRow?

It sets the size of the list items.

It defines the layout style of the items in the list.

It is used to remember the scroll position and manage programmatic scrolling.

It controls the alignment of items in the list.

None

19.

Which component allows you to display grouped lists with headers that stay visible while scrolling?

ScrollView with headers

Column with stickyHeader

LazyColumn with stickyHeader

LazyRow with headers

None

20.

How do you programmatically scroll a Column that uses a ScrollState?

By calling the scroll() method with an index.

By passing a scrollable parameter to the Column.

By using animateScrollTo(value: Int) on the ScrollState.

By applying the scrollBy() function to the Column.

None

Time’s up

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