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 allows synchronous execution

It simplifies async function calls

It handles tasks that throw errors

It prevents task cancellation

None

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

It exits as soon as it is called

It runs on the main thread by default

It exits only after all child tasks are completed

It does not support error handling

None

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

suspendAll()

cancelAll()

clearAll()

stopAll()

None

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

It can lead to data races and corruption

It is incompatible with async properties

It causes performance optimization issues

It causes memory leaks

None

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

Unstructured tasks

Structured tasks

Detached tasks

Async properties

None

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

Unstructured tasks

Detached tasks

Async properties

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?

Implement a task group

Use Swift Actors

Use detached tasks

Use async functions only

None

How are task groups created in Swift?

Using Task.init()

With the withTaskGroup() function

Through the async-let keyword

Using detached tasks

None

10.

How can a Swift task check its current priority?

Task.setPriority()

Task.priorityLevel

Task.getPriority()

Task.currentPriority

None

11.

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

Completion handlers

Task groups

Async properties

Task priorities

None

12.

Which Swift concurrency feature provides a 'suspend point'?

withTaskGroup()

async-let

Task.cancel()

Task.yield()

None

13.

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

The code will result in a compile-time error

The function will execute, but its results will be unpredictable

The function will execute immediately

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

await

yield

async-let

None

15.

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

To enforce strict task priority rules

To handle tasks that must always inherit from their parent

To allow external cancellation of tasks

To manage task groups efficiently

None

16.

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

Task groups

Detached tasks

Swift Actors

Async properties

None

17.

How are unstructured tasks created in Swift?

With completion handlers

Using async functions

By calling the Task initializer

Through actor contexts

None

18.

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

defer

async

suspend

await

None

19.

What role does the main thread play in an application?

Allocates memory for new threads

Runs all asynchronous functions

Manages the user interface and event handling

Handles all background tasks

None

20.

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

Efficient error handling

Increased speed of execution

Direct interaction with threads

Complex and error-prone code

None

21.

How does the 'await' keyword function in Swift?

It pauses execution until an async function returns

It speeds up synchronous code

It marks a function for deletion

It converts synchronous functions to async

None

22.

What is the purpose of the Task object in Swift?

To allocate memory for tasks

To replace all async functions

To create Task Groups

To launch asynchronous functions from synchronous code

None

23.

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

It eliminates the need for error handling

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

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

It converts synchronous code to asynchronous

None

24.

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

isSuspended

isAsync

isCompleted

isCancelled

None

25.

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

Excessive use of ‘await’

Inadequate memory allocation

Data races

Using too many threads

None

26.

What is the primary purpose of structured concurrency in Swift?

To allow direct interaction with threads

To avoid using the async/await keywords

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

To increase the speed of synchronous code

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 cannot be canceled

A task that inherits from its parent

None

28.

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

Task.yield()

Task.restart()

Task.checkCancellation()

Task.cancel()

None

29.

What is a task group used for in Swift?

Running a single task

Structuring error handling

Allocating memory for async functions

Creating multiple dynamic tasks concurrently

None

30.

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

while-loop

repeat-while loop

for-await loop

for-loop

None

31.

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

They replace all synchronous functions

They make properties read-write

They enable asynchronous fetching of data

They allow direct thread manipulation

None

32.

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

await

async-let

Task.yield()

for-await loop

None

33.

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

To suspend a task permanently

To declare safe suspension points for tasks

To increase task priority

To restart a canceled task

None

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