Is there a rivalry between Kotlin and Rust developers? I posted a tweet hinting that I was going to quit Kotlin, and Rust devs started liking and retweeting it...

Is it possible to create 'helper functions' to instantiate annotations from 3rd-party libraries? I'm using SpringDoc to define OpenAPI metadata, and would like to remove visual clutter. e.g., something like this; this doesn't work because `Annotation class cannot be instantiated`:

fun apiResponseOf(code: Int, kclass: KClass<*>) = ApiResponse(responseCode = code.toString(), content = arrayOf(Content(schema = Schema(kclass))))

@Operation(summary = "List all Foos")
@ApiResponses(
    apiResponseOf(200, FooResponse::class)
)

Instead of:

@Operation(summary = "List all Foos")
@ApiResponses(
    ApiResponse(responseCode = "200", content = [Content(schema = Schema(implementation = FooResponse::class))])
)

Hi, I'm using Jetpack Compose for desktop application. How to choose folder (folder pick) ? please help me with a snippet of code

It has been sometime since I started learning

Kotlin

. I feel

gradle

is indispensable for any

kotlin

project. Be it in

Android

or some other frameworks. But it is still a magic for me. How does it pull stuff from the repositories, how does it build projects and so on. Any suggestion on where I can learn about it from the bottom-up? Only some basics stuff that we use day-to-day would be fine. It doesn't feel comfortable to use some tool that I don't understand.

How to play mp3 in kotlin? (not android)

How can I inject (in the Koin) mocked objects in a Ktor app in tests?

Is there a way to interop Python <--> Kotlin

Hi, I'm using jacoco for test coverage and I'm seeing that inline functions with reified types are part of the missed instructions and missed branches in the coverage report. Does somebody know how to overcome this problem? Is it possible? Thanks in advance,

Hi all, sorry if this isn't the place for this, I tried in #reflect but didn't get any responses 😞 A couple of questions with respect to reflection: 1. Is there an equivalent in Kotlin Reflect to Java's 

isInterface

 ? I see we have 

isAbstract

 , 

isOpen

 , etc, but I haven't found anything for interface. 2. Follow up question; is 

MyClass::class.java.interfaces

 the recommended way to get the interfaces implemented by a given class?

What is the difference between

*val* x: String? = y *as* String?

and

*val* x: String? = y *as*? String

?

question: how would you do something specific only on last index while doing a collection.map{ }?

and also, i've upgraded for kotlin 1.3 to 1.4 and noticed some smart casts to string have broken; is doing toString in the original object sufficient, or does smart cast do something I'm not taking into account?

val s: Array<LongArray> = Array(5) { LongArray(10) }
println("size" + s[0].size)

is this the only way to get col size ^^

Hi, is it possible to have a lambda with receiver for

fun interface

types when creating them using the lambda syntax? I can't seem to make it work without actually making a concrete class.

I have this data class

@Serializable
data class ApiResponse<T> (

    @Serializable(with = HttpStatusCodeSerializer::class)
    val code: HttpStatusCode,

    val errors: List<KlubberError> = emptyList(),
    val data: T,
)

Does it make sense to use a type

ApiResponse<Nothing>

in case of errors? And what should I pass for the

data

parameter?

val response = ApiResponse<Nothing> (
    code = myCode,
    errors = listOf(error1, error2),
    data = <what should I use here?>,
)

Using Unit instead of Nothing allows me to write

data = Unit

is that a better approach?

Does anyone know if Exposed supports Kotlin’s value (inline) classes?

What is this error mean?

Unresolved reference: implementation

My build.gradle.kts file https://pastebin.com/EAcCPBff

How do I convert a

ByteArray

to

byte[]

so that I can pass it to a Java method that accepts the "traditional" byte arrays?

I get an "ERROR Overload resolution ambiguity" for

(1..10).sumOf { if (it % 2 == 0) 1 else 0 }

. This looks like a bug to me (I tried both 1.5.21 and 1.5.30). I can avoid that using e.g.

(1..10).sumOf { if (it % 2 == 0) 1L else 0L }

or

(1..10).sumOf { if (it % 2 == 0) 1.toInt() else 0.toInt() }

, but the first one produces a

Long

instead of an

Int

and the 2nd one is just ugly.

Hmm… not sure where to post this since #general is now #announcements But does anyone know if there’s a way for a data class to inherit its toString() implementation from another class? (ie, is there a way to not get the automatically generated data class toString() implementation)

I’d like to define some types or functions in

a.b.c.d

and in another place I can

import a.b.c.d

and reference them as `d.TypeName`/`d.function`. Is there a better way other than defining the inner

d

as an object and put everything inside, which I’m not sure whether it is a good practice.

When using the Kotlin Debugger it happens over and over again that my variables are marked as

'this@with' is not captured

. Is there anything I can disable to not optimise the Kotlin Compiler when running in debug mode?

How do I define a sequence that enumerates all ancestors of a node in a tree (nodes have multiple parents)? Code in 🧵

How can i play audio in korge using korau?

Couple of

value class

queries 🧵

Is anyone using any Kotlin state machine libraries? any recommendations?

Perhaps I'm misremembering, but isn't it possible to override a getter with a val? Given the following Java interface, I'd thought I'd be able to satisfy it with `data class MyOAuth2User(override val name: String) : OAuth2User`; however, it complains that

'name' overrides nothing

.

// OAuth2User.java
public interface OAuth2User {
    String getName();
}

Hi, does anyone know if sealed interfaces are experimental in 1.5.3? Thanks.

Please, I need your help. I have a great desire to create my own Kotlin library or utility. Do you have any ideas?