Await for calling async functions in Swift - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to call the async function and wait for its result.

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'

Aawait

Basync

Cdefer

Dtry

Attempts:

3 left

💡 Hint

Common Mistakes

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

Forgetting to use any keyword and calling the function directly.

Use 'await' to wait for the async function 'fetchData()' to complete and get its result.

2fill in blank

medium

Complete the code to define an async function that waits for another async function.

Swift

func getNumber() async -> Int {
    return 42
}

func printNumber() async {
    let number = [1] getNumber()
    print("Number is \(number)")
}

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.

Calling the async function without 'await' causing errors.

Inside an async function, use 'await' to wait for another async function's result.

3fill in blank

hard

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

Swift

func fetchMessage() async -> String {
    return "Hello!"
}

func showMessage() async {
    let message = [1] fetchMessage()
    print(message)
}

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

Aawait

Basync

Cdefer

Dtry

Attempts:

3 left

💡 Hint

Common Mistakes

Omitting 'await' causing compile errors.

Using 'async' incorrectly before the function call.

You must use 'await' before calling an async function to wait for its result.

4fill in blank

hard

Fill both blanks to create an async function that calls another async function and prints its result.

Swift

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

func greet() [2] {
    let greeting = await getGreeting()
    print(greeting)
}

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

Aasync

Bawait

Cthrows

Ddefer

Attempts:

3 left

💡 Hint

Common Mistakes

Marking only one function as async causing errors.

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

The function 'getGreeting' must be marked 'async' to be asynchronous, and 'greet' must also be 'async' to call it with 'await'.

5fill in blank

hard

Fill all three blanks to create a dictionary comprehension that awaits async calls and filters results.

Swift

func fetchValue(_ key: String) async -> Int {
    return key.count
}

func buildDict(keys: [String]) async -> [String: Int] {
    var dict = [String: Int]()
    for key in keys {
        let value = [1] fetchValue(key)
        if value [2] 3 {
            dict[[3]] = value
        }
    }
    return dict
}

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

Aawait

B>

Ckey

Dasync

Attempts:

3 left

💡 Hint

Common Mistakes

Forgetting 'await' before the async call.

Using wrong comparison operator or variable name.

Use 'await' to wait for 'fetchValue', compare 'value' with '>' 3, and use 'key' as dictionary key.