Associated values per case in Swift - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define an enum case with an associated value.

Swift

enum Result {
    case success([1]: String)
}

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

Amessage

Bvalue

Cinfo

Ddata

Attempts:

3 left

💡 Hint

Common Mistakes

Using a type name instead of a variable name for the associated value.

Omitting the associated value name.

The enum case success has an associated value named message of type String.

2fill in blank

medium

Complete the code to extract the associated value from the enum using a switch statement.

Swift

let result = Result.success(message: "Done")
switch result {
case .success(let [1]):
    print([1])
default:
    break
}

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

Ainfo

Bvalue

Cdata

Dmessage

Attempts:

3 left

💡 Hint

Common Mistakes

Using a different variable name than the associated value name.

Forgetting to use the variable in the print statement.

The associated value message is extracted in the case pattern and printed.

3fill in blank

hard

Fix the error in the enum definition with multiple associated values.

Swift

enum NetworkResponse {
    case error(code: Int, [1]: String)
}

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

Aerror

Bmessage

Cstatus

Ddescription

Attempts:

3 left

💡 Hint

Common Mistakes

Using a type name instead of a variable name.

Using a name that conflicts with the first associated value.

The second associated value should be named message to describe the error message.

4fill in blank

hard

Fill both blanks to create a function that returns the associated value from the enum.

Swift

func getMessage(from response: NetworkResponse) -> String? {
    switch response {
    case .error(_, let [1]):
        return [2]
    default:
        return nil
    }
}

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

Amessage

Berror

Ddescription

Attempts:

3 left

💡 Hint

Common Mistakes

Using different variable names for extraction and return.

Trying to return the ignored code value.

The function extracts the message associated value and returns it.

5fill in blank

hard

Fill all three blanks to define an enum with multiple cases and associated values, and create an instance.

Swift

enum Device {
    case phone([1]: String)
    case tablet([2]: Int)
    case laptop([3]: String)
}

let myDevice = Device.phone(model: "iPhone 14")

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

Amodel

Bsize

Dtype

Attempts:

3 left

💡 Hint

Common Mistakes

Using inconsistent or duplicate names for associated values.

Not matching the associated value name when creating the instance.

The enum cases have associated values named model or size describing the device details.