Hello, i am looking for help with Jetbrains Expose. We have two IdTables and a normal Table to set the IdTables in relation to another. But how do we create an entity in that third table?

unsure whether this is the correct channel but need help to figuring out why I got

ConcurrentModificationException

when iterating (and modify) a mutable list. detail in thread 🧵

Is it possible to get the C source code when compiled by kotlin native?

If I wanted to define a Map where the value is some finite set of types, is there any way to properly type that union? My recollection of several years ago is that there was no way to properly define union types in Kotlin, just wondering if that’s changed?

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There is no gift card in INR !!!

I have

sealed class Bounds<in T : Comparable<T>> {
    abstract operator fun contains(value: T): Boolean
}

And I want

object Unbounded : Bounds<Any?> {
    override fun contains(value: Any?) = true
}

However, I cannot as

Any?

violates the type bound. Is there a way to specify the type to make this work?

I'm pretty new to Kotlin and have a few questions. Where is the most appropriate place to ask questions regarding problems I'm having with projects?

I noticed with Kotlin, documentation is either lean or non-existent. Is it just me?

Any reason for not having something like this in the standard library?

private fun <T> MutableList<T>.addAll(vararg element: T) = element.forEach { add(it) }

It’s only possible to pass a collection, an array, an iterable or a sequence as far as I can see. Which is not idealistic when I want to do something like this

val list = MutableList<Int>()
when {
  someReason() -> list.addAll(1, 2, 3)
  someOtherReason() -> list.addAll(4, 5, 6)
}

is Kotlin’s

ArrayDeque.removeFirst()

an

O(1)

operation?

I kind of understand what is happening here, but how best to explain it?

fun <T> Foo<T>.getValue(): T

val foo: Foo<Boolean> = ...
println("no problem: " + foo.getValue())
val fooAnyValue: Any = foo.getValue()
println("also no problem: " + fooAnyValue)
val fooValue = foo.getValue()
println("class cast exception (fooValue is not a Boolean): " + fooValue)

Hey everyone, I was going through the documentation for

callsInPlace

Kotlin contracts and found an error in it, how can I correct it by contributing? I am new to open source and would love to contribute to Kotlin. Help would be appreciated.

I'm trying to use JUnit Pioneer

@CartesianTest.Values

annotation with an array literal, but I get an error (Kotlin 1.8.10):

For a function like this, does it make sense to make it inline?

public inline fun Boolean.asGBoolean(): Int = if (this) 1 else 0

Hi Kotlin friends, I am trying to learn how annotation, reflection and continuation works. I appreciate for any comments/directions. Here is my context: I am using spring boot webflux with kotlin coroutine and openapi codegen. I want to be able pass in the request context to my application logic from the webfilter layer all the way to the business logic layer. the challenge i am facing is that: 1. webflux is running on reactor, that means the webfilter layer (interceptor) is running on reactor 2. my controllers are running in coroutine and these points to my business layer 3. my controller interfaces are generated by openapi codegen which does not provide me with flexibility of adding additional parameters (such as the

webServerExchange

object). My initial attempt is: 1. pass the context from reactor to coroutine using context capture, and later i can retrieve the context without needing the

webServerExchange

object 2. define an customized annotation such as

WithReactiveContext

3. add this annotation to my controller class so that all my suspending function will be wrapped inside an different coroutine context (instead of the default one) My questions are: 1. do you guys think this is a legit approach given my context 2. if this approach sounds okay, how do I trigger the annotation method using reflection so that all the suspending functions in annotated class is wrapped within a different coroutine context 3. if this approach does not make sense whats an alternative solution

I'm writing Playwright tests with Kotlin and I define the Browser and the Page in my BaseTest class to be created before each test. Like this

open class BaseTest {

    lateinit var browser: Browser
    lateinit var page: Page

    @BeforeEach
    fun setUp() {
        browser = Playwright.create().chromium().launch()
        page = browser.newPage()
    }
}

But I don't like to use a mutable

lateinit var

modifiers. How can I turn these two into immutable variables? Using

lazy

? But then the variable will be initialized only once.

How can I modify a

private val

inside a companion object through reflection?

<?xml version="1.0" standalone="yes"?><svg version="1.1" width="383" height="383">

How I can get

width

and

height

value using Regex?

I am trying to make an observable list, where I have a LiveData/StateFlow that emits the list whenever the list is mutated. I need the list to be iterable by multiple threads/coroutines. This is my signature:

class ObservableList<T>: MutableList<T> by Collections.synchronizedList(ArrayList()) {

But when I override a function, it gives an error: Abstract member cannot be accessed directly

override fun add(element: T): Boolean {
    val add = super.add(element)
    mObserver.postValue(this)
    return add
}

I don't understand interfaces with extension functions. say I have

class Foo(val s: String)

interface MyInterface {
    fun Foo.bar(): String
}

object MyImpl : MyInterface {
    override fun Foo.bar(): String = this.s
}

then given

val myImpl = MyImpl

and an instance of

Foo

, how/when can I call `MyImpl`'s implementation of

bar()

?

I've got something like

interface MyInterface<R> {
    fun doIt(): R
}

object MyImpl : MyInterface<String> {
    override fun doIt(): String = "hello"
}

object MyOtherImpl : MyInterface<Int> {
    override fun doIt(): Int = 5
}

which works fine. now say I've got

fun <R> foo(impl: MyInterface<R>): R = impl.doIt()

is it possible to add a default value to

impl

?

fun <R> foo(impl: MyInterface<R> = MyImpl) = impl.doIt()

doesn't compile. the best I could come up with is to also add an overload of `foo`:

fun foo() = foo(MyImpl)

.

Hello, could some one help me with this please? https://stackoverflow.com/questions/75779125/kotlin-compose-how-to-know-when-suspend-function-is-finished

how do i get the keycode of a keypress?

i just need a little bit help, is this could be possible to manual integrate C# sdk in android kotlin project?

Is there any way how to partition a list using an isInstance predicate, so that the matching elements are of the given type?

val (xs, nonXs) = list.partition { it is X }
// xs is of type List<X>

Hello

Hey I was wondering how I could add two lists together like this

val list1 = listOf("hello", "world")
val list2 = listOf(*list1, "test")

I mainly just need to spread list1 into list2 so the type is List<String> on list2

Hey, I’m looking for a way to wrap a method into a higher-order function that runs some checks, before running that method. 🧵