Swift Structured Concurrency Quiz

Take this quiz to test your understanding of structured concurrency in Swift.

What is the advantage of using 'withThrowingTaskGroup()' over 'withTaskGroup()'?

It simplifies async function calls

It allows synchronous execution

It handles tasks that throw errors

It prevents task cancellation

None

What happens when a parent task is running in structured concurrency?

It runs on the main thread by default

It exits only after all child tasks are completed

It does not support error handling

It exits as soon as it is called

None

What method is used to cancel all tasks within a task group?

clearAll()

suspendAll()

stopAll()

cancelAll()

None

Why is direct mutation of variables within concurrently executing code not allowed?

It is incompatible with async properties

It causes memory leaks

It causes performance optimization issues

It can lead to data races and corruption

None

What type of task should be used when tasks need to be externally cancelable?

Unstructured tasks

Detached tasks

Structured tasks

Async properties

None

Which concurrency approach does not inherit properties from its parent in Swift?

Unstructured tasks

Async properties

Detached tasks

Structured tasks

None

What is the 'for-await' loop's primary function?

To await the return of values from async tasks

To handle errors in async code

To iterate over synchronous data

To handle completion handlers

None

What should be done to avoid data races when multiple tasks need to access shared data?

Use Swift Actors

Use async functions only

Use detached tasks

Implement a task group

None

How are task groups created in Swift?

With the withTaskGroup() function

Using Task.init()

Using detached tasks

Through the async-let keyword

None

10.

How can a Swift task check its current priority?

Task.currentPriority

Task.priorityLevel

Task.getPriority()

Task.setPriority()

None

11.

What feature in Swift helps manage task execution order and dependencies?

Task priorities

Task groups

Completion handlers

Async properties

None

12.

Which Swift concurrency feature provides a 'suspend point'?

withTaskGroup()

Task.cancel()

async-let

Task.yield()

None

13.

What happens if an async function is called from a synchronous context without using the Task object?

The function will execute, but its results will be unpredictable

The function will execute immediately

The code will result in a compile-time error

The function will be converted to a synchronous call

None

14.

Which keyword in Swift is used to indicate that an asynchronous function call must complete before the calling function continues?

async

yield

async-let

await

None

15.

What is a primary use case for using unstructured tasks in Swift?

To allow external cancellation of tasks

To handle tasks that must always inherit from their parent

To enforce strict task priority rules

To manage task groups efficiently

None

16.

Which concurrency feature in Swift is used to manage shared mutable state safely?

Task groups

Async properties

Swift Actors

Detached tasks

None

17.

How are unstructured tasks created in Swift?

By calling the Task initializer

Using async functions

Through actor contexts

With completion handlers

None

18.

Which keyword is used to declare a function as asynchronous in Swift?

await

async

defer

suspend

None

19.

What role does the main thread play in an application?

Runs all asynchronous functions

Handles all background tasks

Manages the user interface and event handling

Allocates memory for new threads

None

20.

What problem does the use of completion handlers in Swift often cause?

Efficient error handling

Increased speed of execution

Complex and error-prone code

Direct interaction with threads

None

21.

How does the 'await' keyword function in Swift?

It pauses execution until an async function returns

It marks a function for deletion

It speeds up synchronous code

It converts synchronous functions to async

None

22.

What is the purpose of the Task object in Swift?

To create Task Groups

To replace all async functions

To launch asynchronous functions from synchronous code

To allocate memory for tasks

None

23.

What is the effect of using 'async-let' in Swift?

It allows code to run concurrently while waiting for an async function

It forces a function to wait for an async call to complete

It converts synchronous code to asynchronous

It eliminates the need for error handling

None

24.

Which property can be used to check if a Swift task has been canceled?

isCancelled

isSuspended

isAsync

isCompleted

None

25.

What is a common cause of data corruption in concurrent programming?

Excessive use of ‘await’

Inadequate memory allocation

Using too many threads

Data races

None

26.

What is the primary purpose of structured concurrency in Swift?

To handle concurrency in a way that is easy to write and understand

To increase the speed of synchronous code

To avoid using the async/await keywords

To allow direct interaction with threads

None

27.

What is a detached task in Swift?

A task with no parent and independent properties

A task that runs synchronously

A task that inherits from its parent

A task that cannot be canceled

None

28.

What method is used to handle cancellation errors in Swift tasks?

Task.cancel()

Task.yield()

Task.restart()

Task.checkCancellation()

None

29.

What is a task group used for in Swift?

Running a single task

Allocating memory for async functions

Creating multiple dynamic tasks concurrently

Structuring error handling

None

30.

Which loop is specifically designed to process asynchronous results in Swift?

while-loop

repeat-while loop

for-loop

for-await loop

None

31.

What is the main advantage of using async properties in Swift?

They allow direct thread manipulation

They make properties read-write

They enable asynchronous fetching of data

They replace all synchronous functions

None

32.

Which Swift concurrency feature allows code to continue execution without waiting for an async function to finish?

await

async-let

for-await loop

Task.yield()

None

33.

What is the purpose of the 'Task.yield()' method?

To suspend a task permanently

To increase task priority

To declare safe suspension points for tasks

To restart a canceled task

None

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