I'm really confused by how to share code I write in kotlin with the world. The only guides I can find for publishing kotlin libraries are for multiplatform. It seems like I need to pick a repository and have totally different gradle code for each. Is there some way to do this that doesn't take hours?

why cant a

data class

be

open

?

Hi everyone, I want to read from android datastore, inside the viewModel or repository and want that value available at the time of initialising viewModel. Can anyone suggest a good approach. Thanks

I am trying to set as private the constructor of inline classes (and value classes, I tried both), but I am getting an exception. Is it not supported yet?

I need to download pdf file from url and store in internal storage of app..any pointers ?

Hello 👋, quick question about data mapping? What would you use to map an object (eg: a

RemoteUser

received by a backend to a

User

object used by the business logic inside an app)? I used to do it via Interface + Implementation

interface IUserMapper {
    fun remoteToEntity(remote: RemoteUser): User
}

, what is the real benefit than doing it directly with an extension function ?

fun RemoteUser.toUser() = 
...

(except mocking) 🤔

Hello guys! Have the following issue: I want to track any change in my Map to notify a callback later, and what I did for now (this is just a rush attempt, so the solution may be bad): The map impl: https://pastebin.com/G5HK9jE6 The list impl: https://pastebin.com/ViKrnJQ2 (used in the map

values

) The set impl: https://pastebin.com/zfHS0KZc (used in the map

keys

,

entities

) I hope there is a proper solution, and you can say what I'm doing wrong (or maybe this is the only way)

does anyone know if it’s possible to get a reference to the KClass of a generic type parameter? eg.

inline fun <reified T>test() { typeOf<T>()... }

is anyone having problem with the

kotlin.Result

class?

I'll have to write a pretty basic Annotation Processor (generating a documentation file checking all the classes in the project for special annotations). I understand that there's old KAPT and new (alpha-state) KSP. So normally I'd say, I'll have to use KAPT because KSP is still alpha, but is KAPT maybe equally unstable at the moment, because the Kotlin Compiler Frontend is being reworked? If that's the case I'd probably pick the more modern KSP and update my Processor whenever there's a breaking change (because I don't expect this to be much work given the simple nature of what I need it to do). Are there any educated guesses of when KSP and KAPT (should it be currently unstable) will become stable?

Hey guys! I'm having some problems with frozen objects on iOS, but only upon upgrading some dependencies. Any ideas? https://youtrack.jetbrains.com/issue/KTOR-2799

I have Android Studio 4.2.1 on Mac M1, AVD with arm64 CPU. I cannot run this AVD. How should I do? thank you.

How come I can write:

val file = File("hello.txt")
return when {
    file.isFile -> Or.good(file)
    else        -> Or.bad(chapter.fileName)
}

But if I try to capture the

when

subject in a variable like this:

return when(val file = File("hello.txt")) {
    file.isFile -> Or.good(file)
    else        -> Or.bad(chapter.fileName)
}

I get, "Incompatible Types: Boolean and File" on the

file.isFile

part? The end of this section makes it look like I should be able to do this: https://kotlinlang.org/docs/control-flow.html#when-expression

Hey folks, I have just launched the Brussels Kotlin User Group, I would be grateful if you could connect me with people managing DevRel at Kotlin. see https://jiraguha.github.io/brussels-kotlin-user-group/

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Just curious if there's any timeline for new kotlin branding "refactoring"? Slack logo here (and kotlin emojis) are still under old brand.

Kotlin have new feature of sealed class in 1.5.0, which we can extend sealed class within the same package, maybe now we can implement

package private

with sealed and protected?

requireNotNull

does not provide smart cast null safety. Is there another way to concisely mark null as Illegal state and have smart cast?

private var id: Long? = null

override fun delete() = runBlocking {
    requireNotNull(id)
    notesRepository.deleteNote(id!!) // id is not smart cast to not null
}

is there some summary page about bugs in Kotlin? in particular I'm interested in bug increase over time e.g. after major version bumps, and how the speed of new bugs appearing relates to the speed of fixing them 😅 YouTrack is public so I could glue some nifty query and dashboard myself, but maybe someone has already done it?

https://play.kotlinlang.org/hands-on/Introduction%20to%20Coroutines%20and%20Channels/ does not load for me. The page loads, but remains blank. Is it just me? (kotlinlang.org docs about coroutines link to there)

Hi does anyone know how to create float ranges? I want to get random values between 1.0 to 1.5 for my use case

What’s the correct way to signal that a property getter failed to execute? I know kotlin prefers sealed class result types to exceptions, but I can’t think of another good way to communicate to the caller that a property getter failed except to return null, which isn’t always a good option.

Hi all, I need to initialize a

ByteArray

with hex literals. Here is my Approach:

val key = intArrayOf(0x80, 0xFF, 0x00, 0x7f).map { it.toByte() }.toByteArray()

And the result is (and should be):

-128,-1,0,127

Is there a more compact/idiomatic way to do that?

anyone else sometimes feeling the urge do wrap strings with value classes so that e.g. in a

UserProfile

class

email

and

about_me

are different types ? I know its overkill but i cant help it

Is -Double.MAX_VALUE guaranteed to give the smallest finite negative Double?

Is there a (cheap, i.e no list allocations) way to get the size of a range? Like

(1..5).size

?

Can someone try adding 370.1 + 0.1 and see if you get 370.2? If it is, try this

val x = 370.1
x + 0.1

I'm getting 370.20000000000005 on a few different Kotlin versions

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I want to write a function that takes an intersection type, but I don't know the syntax (or if it's possible in Kotlin). Here's what I'd imagine using a single ampersand like so:

// Error here ---v
fun <T : Slugged & BaseModel> suggestSlug(
    tempSlug: String,
    clazz: Class<T>,
): String

I want to make sure the class passed to this function implements

Slugged

(to be sure it has a

.slug

property) and extends the abstract class

BaseModel

(to be sure it has an

.id

property and is a database

@Entity

class - I'm using Ebean). I found this, which shows the set-theory, but doesn't show the syntax I need (I apologize if I am misunderstanding any of this): https://kotlinlang.org/spec/type-system.html#intersection-types Should I just make an abstract

SluggedBaseModel

? I'd rather not because abstract vars annotated

@Column

need to be initialized and this should be a non-null required constructor parameter for each entity bean that uses it.