Await keyword in iOS Swift - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to wait for the asynchronous function to finish before printing the result.

iOS Swift

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

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

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

Atry

Basync

Cdefer

Dawait

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'async' instead of 'await' before the function call.

Omitting the keyword and calling the function directly.

The await keyword pauses the function until the asynchronous call completes, then returns the result.

2fill in blank

medium

Complete the code to mark the function as asynchronous so it can use 'await'.

iOS Swift

func fetchUser() [1] -> String {
    return "User data"
}

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

Aawait

Bsync

Casync

Dthrows

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'await' to mark the function instead of 'async'.

Forgetting to mark the function as async when using await inside.

The async keyword marks a function as asynchronous, allowing it to use await inside.

3fill in blank

hard

Fix the error in calling an async function inside an asynchronous function by adding the missing keyword.

iOS Swift

func syncFunction() async {
    let data = [1] fetchData()
    print(data)
}

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

Aawait

Bdefer

Ctry

Dasync

Attempts:

3 left

💡 Hint

Common Mistakes

Calling the async function without 'await', causing errors.

Using 'async' instead of 'await' before the call.

You must use await to call an async function and wait for its result.

4fill in blank

hard

Fill both blanks to correctly define and call an async function that returns a string.

iOS Swift

func getMessage() [1] -> String {
    return "Hello"
}

func show() async {
    let message = [2] getMessage()
    print(message)
}

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

Aasync

Bawait

Cthrows

Ddefer

Attempts:

3 left

💡 Hint

Common Mistakes

Forgetting to mark the function as async.

Calling the async function without await.

The function must be marked async to be asynchronous, and the call must use await to wait for its result.

5fill in blank

hard

Fill all three blanks to create an async function, call it with await, and handle errors with try.

iOS Swift

func fetchInfo() [1] throws -> String {
    return "Info"
}

func process() async {
    do {
        let info = [2] [3] fetchInfo()
        print(info)
    } catch {
        print("Error")
    }
}

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

Aasync

Bawait

Ctry

Ddefer

Attempts:

3 left

💡 Hint

Common Mistakes

Using try without await or vice versa.

Not marking the function as async when it uses await.

The function is marked async and throws. When calling it, use try and await to handle errors and wait for the result.