Nonisolated methods in Swift - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare a nonisolated method in an actor.

Swift

actor Counter {
    nonisolated func [1]() -> String {
        return "Hello from nonisolated method"
    }
}

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

Agreet

Bincrement

Ccount

Dupdate

Attempts:

3 left

💡 Hint

Common Mistakes

Using a method name that implies state change like 'increment' or 'update' in a nonisolated method.

The method greet is declared as nonisolated to allow calling it without actor isolation.

2fill in blank

medium

Complete the code to mark the method as nonisolated in the actor.

Swift

actor Logger {
    [1] func log(message: String) {
        print(message)
    }
}

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

Anonisolated

Basync

Cisolated

Dstatic

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'static' or 'async' instead of 'nonisolated'.

The nonisolated keyword allows the log method to be called without actor isolation.

3fill in blank

hard

Fix the error by adding the correct keyword to the method to make it nonisolated.

Swift

actor DataStore {
    func fetch() -> String {
        return "Data"
    }

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

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

Aisolated

Basync

Cnonisolated

Dstatic

Attempts:

3 left

💡 Hint

Common Mistakes

Forgetting to mark the method as nonisolated causes isolation errors.

Adding nonisolated to info allows it to be called without actor isolation.

4fill in blank

hard

Fill both blanks to create a nonisolated static method inside an actor.

Swift

actor Service {
    [1] [2] func status() -> String {
        return "Running"
    }
}

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

Anonisolated

Bisolated

Cstatic

Dasync

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up 'isolated' and 'nonisolated' or forgetting 'static'.

The method is both nonisolated and static, so it can be called without actor isolation and without an instance.

5fill in blank

hard

Fill the blank to define a nonisolated async method inside an actor.

Swift

actor Network {
    [1] func fetchData() async -> String {
        return "Data fetched"
    }
}

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

Aisolated

Bnonisolated

Casync

Dstatic

Attempts:

3 left

💡 Hint

Common Mistakes

Putting async before func (invalid syntax; async belongs in the signature after ()).

Omitting nonisolated or using isolated.

The method is marked nonisolated before func and async after the parameters in the signature.