Sottti

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Sottti

Articles:
- [Typesafe Error Handling in Kotlin](https://kotlin.christmas/2019/17)
- [Sealed Classes Instead of Exceptions in Kotlin](https://phauer.com/2019/sealed-classes-exceptions-kotlin/)
- [Kotlin’s Missing Type, Either](https://medium.com/@Robert_Chrzanow/kotlins-missing-type-either-51602db80fda)

Libraries
- https://github.com/michaelbull/kotlin-result
- https://github.com/kittinunf/Result

Discussions

Sottti

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Sottti

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Sottti

open class User(val userId: Int, val userName: String)
class Editor(userId: Int, userName: String, val rank: Int) : User(userId, userName)
class Moderator(userId: Int, userName: String, val type: Int) : User(userId, userName)
class Staff(userId: Int, userName: String, val department: String) : User(userId, userName)

Sottti

// OverridenFromAnotherFile.kt

// Error: getAge() is not visible because is protected
val userAge = User().getAge()

// Error: getAge() is not visible because inherits the protected modifier
val moderatorAge = Moderator().getAge()

// getAge() is visible because the modifier is declared explicitly as public
val staffAge = Staff().getAge()

Sottti

// Overridden.kt

public open class User {
    protected open fun getAge() = 16
}

public class Moderator : User() {
  // getAge() inherits the protected modifier as default
    override fun getAge() = 18
}

Sottti

// User is public
// The User primary constructor is private
class User private constructor(id : Int) {
  // ...
}

// Moderator is internal
// The Moderator primary constructor is private
internal Moderator private constructor(id : Int) {
  // ...

Sottti

// DifferentModule.kt file

// ERROR: numberThree is not visible because this file is in a different module than Internal.kt
// ERROR: numberEight is not visible because User() is in a different module than Internal.kt
private const val numberEleven = numberThree.plus(User().numberEight)

Sottti

// SameModule.kt file

// numberThree is visible because this file is in the same module than Internal.kt
// numberEight is visible because this file is in the same module than User
private const val numberEleven = numberThree.plus(User().numberEight)