GET request with async/await in iOS Swift - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a URL object from a string.

iOS Swift

guard let url = URL(string: [1]) else { return }

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

A"https://api.example.com/data"

Bhttps://api.example.com/data

CURL("https://api.example.com/data")

DurlString

Attempts:

3 left

💡 Hint

Common Mistakes

Forgetting to put the URL string in quotes.

Passing a variable name that is not defined.

The URL initializer expects a string, so the URL string must be in quotes.

2fill in blank

medium

Complete the code to perform an asynchronous GET request using URLSession.

iOS Swift

let (data, _) = try await URLSession.shared.[1](from: url)

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

AdownloadTask

BdataTask

Cpost

Ddata(from:)

Attempts:

3 left

💡 Hint

Common Mistakes

Using dataTask which is not async/await compatible.

Using downloadTask which downloads to a file.

The async method to get data from a URL is data(from:).

3fill in blank

hard

Fix the error in the async function declaration for fetching data.

iOS Swift

func fetchData() async throws -> Data {
    let url = URL(string: "https://api.example.com/data")!
    let (data, _) = try await URLSession.shared.data(from: url)
    return [1]
}

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

Aurl

Bdata

Cself

Dresponse

Attempts:

3 left

💡 Hint

Common Mistakes

Returning the URL instead of data.

Returning the response object which is not declared.

The function should return the data received from the network call.

4fill in blank

hard

Fill both blanks to decode JSON data into a Swift struct.

iOS Swift

let decoder = JSONDecoder()
let result = try decoder.[1](MyStruct.self, from: [2])

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Adecode

Bdata

CjsonData

Dencode

Attempts:

3 left

💡 Hint

Common Mistakes

Using encode instead of decode.

Passing wrong variable instead of data.

Use decode method to decode JSON data. The data variable holds the JSON bytes.

5fill in blank

hard

Fill all three blanks to complete the async function that fetches and decodes JSON.

iOS Swift

func fetchAndDecode() async throws -> MyStruct {
    guard let url = URL(string: [1]) else { throw URLError(.badURL) }
    let ([2], _) = try await URLSession.shared.data(from: url)
    let decoder = JSONDecoder()
    return try decoder.decode([3].self, from: data)
}

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

A"https://api.example.com/data"

Bdata

CMyStruct

Durl

Attempts:

3 left

💡 Hint

Common Mistakes

Not quoting the URL string.

Using wrong variable names for data.

Passing wrong type to decode.

The URL string must be quoted, data holds the downloaded bytes, and MyStruct is the type to decode.