Why modern concurrency matters in Swift - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to start a simple asynchronous task in Swift.

Swift

Task [1] {
    print("Hello from async task!")
}

Drag options to blanks, or click blank then click option'

Astart

Binit

Cdetached

Drun

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'start' or 'run' which are not valid Task methods.

In Swift, Task.detached starts a new asynchronous task detached from the current context.

2fill in blank

medium

Complete the code to await an asynchronous function call.

Swift

func fetchData() async -> String {
    return "Data"
}

func load() async {
    let result = [1] fetchData()
    print(result)
}

Drag options to blanks, or click blank then click option'

Async

Basync

Cdefer

Dawait

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'async' instead of 'await' when calling async functions.

The await keyword is used to wait for an asynchronous function to complete in Swift concurrency.

3fill in blank

hard

Fix the error in the code to correctly define an async function.

Swift

func process() [1] -> String {
    return "Done"
}

Drag options to blanks, or click blank then click option'

Aasync

Bawait

Casync throws

Dthrows

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'await' in the function signature instead of 'async'.

To define an asynchronous function in Swift, add the async keyword before the return type.

4fill in blank

hard

Fill both blanks to create a Task that returns a value asynchronously.

Swift

let task = Task [1] {
    return [2]
}

Drag options to blanks, or click blank then click option'

A.detached

B42

C"Hello"

D.init

Attempts:

3 left

💡 Hint

Common Mistakes

Using .init instead of .detached for creating a detached task.

Task.detached creates a new detached task, and the task returns the string "Hello".

5fill in blank

hard

Fill all three blanks to define and call an async function correctly.

Swift

func greet() [1] -> String {
    return "Hi!"
}

Task [2] {
    let message = [3] greet()
    print(message)
}

Drag options to blanks, or click blank then click option'

Aasync

Bdetached

Cawait

Dthrows

Attempts:

3 left

💡 Hint

Common Mistakes

Forgetting to mark the function async or missing the await keyword when calling it.

The function is marked async, the task is created with detached, and the call uses await to wait for the result.