I'd like to extend this interface and overwrite its method

interface WebhookEventInterface<T> {
    operator fun invoke(block: WebhookEventInterface<T>.() -> Unit) {..}
}

in this way

interface PushPullRequestFeatures<T> : WebhookEventInterface<T> {
    override operator fun invoke(block: PushPullRequestFeatures<T>.() -> Unit) {..}
}

Unfortunately I didn't find a way to successfully infer the new receiver on the lambda. The above code does not override the super method:

'invoke' overrides nothing

and there is also a platform clash:

Platform declaration clash: The following declarations have the same JVM signature (invoke(Lkyge/triggerEvents/PushPullRequestFeatures;Lkotlin/jvm/functions/Function1;)V):

I've tried to use

@JvmName

, but it says:

'@JvmName' annotation is not applicable to this declaration

I tried also

@OverloadResolutionByLambdaReturnType

by changing the return type, but the clash doesn't go away neither Any idea?

In Android Studio I have red all over my code, "import io.ktor.<anything> has "ktor" in red, "serialization" in "import kotlinx.serialization.SerialName" is also red, but the (Android) app builds. Errr, whut? It's only just started happening (although it's not unknown previously here), so I suppose I've changed something, but what could it be?

what is the most/ a popular library companies use to store sensitive information like social security number, passwords, etc. into a database?

I'd like to create a variable by delegation

val username by Input { }

Where

class Input {
      companion object {
         operator fun invoke(..): Input {
            ..
         }
      }
   }

And

internal operator fun Any.getValue(thisRef: Any?, property: KProperty<*>): Input {
    println("$thisRef, thank you for delegating '${property.name}' to me!")
    val pInput = property as KProperty0<Input>
    println(pInput)
    return pInput.get()
}

pInput

is a valid

KProperty0

class, but the moment I call

.get()

to retrieve

Input

, then I get:

java.lang.UnsupportedOperationException: call/callBy are not supported for this declaration.

Why? How can I fix it? What is the way to retrieve the

Input

instance produced by its own companion object?

I am facing issues setting up atrium project. I wanted to contribute and help solve an issue but I am not able to get the project running. Since this is not an application and a library I don't know how to setup run configurations for the project. I am able to build the project successfully but none of the tests seems to run as there are no run configurations. Project link: https://github.com/robstoll/atrium

Hi All, i'm still learning Kotlin and i'm currently learning how to use scope functions and would like to understand what the following mean for points 1 and 2

inline fun <T, R> T.let(*block*: (T) -> R): R

1) <T, R> T what does the extra T outside the <> mean

2) What does R mean

does kotlin test framework have any way to set up a list of parameters to a test function?

I have a configuration lambda

var configure: Input.() -> Unit

as a property on

Input

itself in order to execute it later on. However, to execute it externally, I have to call

input.configure(input)

... does this sound right? I'm inclined to think so, because if I scope

input

, then I can simply call configure as

input.apply { configure() }

, but I'd like to have some feedbacks on this

Why casting 'some value typed with type argument' does not cause that type to be smartcast? For example, when you have simple function,

fun <T> test(value: T): T {
    value as Int
    return 123
}

Shouldn't this work?

lateinit var .... ::viewModel.isInitialized

what is this at runtime? should I be vary of calling it too frequently? or is it just null check and assert?

Sorry if this is obvious but I just realized I wasn’t sure — is equality in a

Set

compared via

equals()

?

Hi, when

infix

functions are useful ?

Hello. I’ve got a Data Class I’m defining that can represent database columns. I’d like one of the properties on the Data Class to be

defaultValue

, but the type of that value is dependent on

dataType

property. I was thinking I’d need a union type for

defaultValue

, but just found out Kotlin doesn’t support that. I could use

Any

, but that breaks the kotlinx.serialization

@Serialiazable

annotation. Has anyone got any ideas or can point me in the right direction?

Hello, what are the available packages for measuring

unit-Test-coverage

written in kotlin with spring boot 2

Humm... is there any way to allow passing a

value class WriteableResource(val ro: Resource)

to a method only accepting

Resource

without explicitly passing its member? Does it have to explicitly implement an interface for

Resource

?

Why is it necessary to wrap the

data class

with parentheses?

What would be the most ideomatic way to do such a thing in Kotlin?

val l = listOf(foo1, foo2, foo3)

var found = l.find(::criteria1)

if (found != null) return doAction(found)

var found = l.find(::criteria2)

if (found != null) return doAction2(found)

...

Hey folks, I want to do something like the following

val components: List<Component> = BuilderClass(...some stuff...).into(Component)

I.e. you use the 

into

 function to take any Class and return a list of that class Something like

Class BuilderClass(...) {

  fun into(klass: KClass<Any>): List<what_goes_here?> {
     ...

Anyone know if this is possible?

This message was deleted.

Why does lazy delegation break contracts?

If I have:

interface Foo {
   fun printlog(msg: String) = "... - $msg"
}

class Bar : Foo

How can I get the printlog in the interface to print out

Bar - some message

? If I use

${this::class.simpleName}

it just gives me the interface's name...

Is there an easy to to get the `Class`/`KClass` object of a top-level .kt file?

Hi, I recently cloned kotlin github repo, but facing some issue with building it. gradle task

:kotlin-stdlib:commonSources

fails with

No compatible toolchains found for request filter: {languageVersion=6, vendor=any, implementation=vendor-specific} (auto-detect true, auto-download true)

I am currently on macOS and have installed java6 using brew as mentioned in the README. How to resolve this issue?

I have an unknown data class being passed into a function - which I use reflection on to figure out the arguments and then map to the result of columns in an arbitrary SQL query in a MutableMap. I then want to create an instance of the data class. In Python, it’d be

MyClass(**mutableMapObj)

I’ve tried various options using kclass and callBy, but what I really want to do is destructure the mutableMapObj into the class instantiation call. I.e. my

MyClass.pleaseTakeAMap(mutableMapObj)

is equivalent to

MyClass(param1 = mutableMapObj["param1"], param2 = mutableMapObj["param2"]

Ideally I could do this without have to add to companion object onto each data class.

Hello everyone! I want to use maxOf with 2 strings but compare by the String.length. Something like

maxOf("aaaa","zzz")

and return

"aaaa"

. How could I achieve this?

Hello I am new to Kotlin, I have a function

public final func<R> change(method: (I) -> R): Mono<R> { .... }

and I want to mock this function for any input I want to return a Mono.Empty response. How do I do it? I am lost. I am using Mockito

Hi, is there a way to retrieve all classes having a custom annotation?

Heya \o I'm starting to code Kotlin and I'm really liking it, but the thing is, I have relatively low-end hardware. Running big IDEs like IntelliJ IDEA is a pain for me and can make the system unusable for minutes. I usually code in VSCode or Neovim with extensions. I...personally found that the experience was well, good, but just not that..well. The LSPs for Kotlin overall just suck compared to IJ. Plus installing and setting up Kotlin, JRE and everything wasn't a fun experience at all 😛 This is more of a request, rather than getting help, but can JetBrains please focus on better Kotlin support on IDEs which aren't IntelliJ IDEA?

Hi guys I was trying to filter upon a sealed class-specific state but the filter function didn't work. Does anyone know how to do filter against sealed classes state? for example:

sealed class States{
object Loading:States()
data Success(val data: String):States()
}

results.filter{
 it.state is States.Success 
}.forEach{ successState ->
println(successState.data) //Error since this still State not Success State
}