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Mastering Kotlin Essentials

Exercise: User Authentication

Explore how to implement a user authentication system with Kotlin's sealed class hierarchy. Learn to define AuthSuccess and AuthFailure data classes for success and failure cases, and handle nullability using the Elvis operator. This lesson guides you through creating robust authentication logic using Kotlin's type system.

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Problem statement

Implement a sealed class hierarchy to represent the result of user authentication operations. The AuthResult class can have two subclasses: AuthSuccess and AuthFailure. Additionally, introduce nullable types and use the Elvis operator to handle potential null values in the process.

Here is the provided class hierarchy:

Kotlin 1.5
sealed class AuthResult {
    // TODO: Implement AuthSuccess data class
    // Represents a successful authentication result with a non-null username.
    // TODO: Implement AuthFailure data class
    // Represents a failed authentication result with a non-null errorMessage.
}

Your task is to implement the AuthSuccess and ...