Is there a way to add a line break when using backticks to name a method? I'm in the middle of a huge refactoring and would like to write a good description on the tests that I'm creating for that. The long names will be gone later with the methods refactoring but it would be nice to have long names for now...

Hi is there a way to tell kotlin that all of the functions inside an object or companion object must be annotated with

@JvmStatic

? without need to annotating individual functions

According to https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/synchronized.html

synchronized

for

common

but not for

js

and

jvm

- which in fact are the both platforms i target. is there a way to use it in

common

without the deprecation warnuing?

Hi folks - I created a new website to help with finding and posting jobs pertaining to Kotlin only and wanted to share it here. We also have an email subscription list you can subscribe to in order to get a weekly update of newly added jobs. Hope it helps some people out! You can visit it at https://kotlin-jobs.com/

Question on combining sealed classes with data classes, in thread.

I have an issue with the following piece of code:

inline fun StringReader.tryTo(block: StringReader.TryTo.() -> Unit){
	contract {
		callsInPlace(block, kotlin.contracts.InvocationKind.EXACTLY_ONCE)
	}
	try {
		it.block()
	} catch (e: Exception) {
		it.reset()
	}
}

And

override fun parse(reader: StringReader): String? {
	reader.tryTo {
		throw Exception("hi")
	}
	return null // Marked as unreachable code
}

On a inline lambda seems to not realise that an exception that is thrown in the lambda can be caught in the inlined function. This gets even worse when the return is not nullable and the user doesn't add a return as it is marked as unreachable and as a result at runtime the function will return null.

Hey community, I am looking for example gradle script to build and publish jar + doc to the maven central repository. Please help.

Hi, I need to add file on the fly (generate file). What is the most reliable way to do so? I think that generating file to /*out*/test/resources is not a good idea, isn't it?

@jonnyzzz could I DM you ?

I don't understand the use of "*" in this context

Why is it

*

btw? Could be something more comprehensible like this 🤔

ByteString.of(vararg buffer.toByteArray())

Why does

as? TArgument

give an

Unchecked cast

warning

Hi guys one question, I want to have a variable that represent Any function. meaning that function can have from 0 to N different params, is that possible?

Is there a way of avoiding having to specify the same class twice in the code below? I have a generic abstract class, and I need to know what's the actual type (because I want to use it when deserializing with Jackson's

ObjectMapper

). So I know that I need to pass the class as an argument. But then, I also need to specify the type

T

when instantiating the generic base class. Is there a way of making the compiler infer any of the two?

data class ExamplePayload(val value: String, val otherValue: Int)

abstract class Worker<T : Any>(private val kclass: KClass<T>) {
    private lateinit var objectMapper: ObjectMapper

    fun handleMessage(message: String) {
        val payload = objectMapper.readValue(message, kclass.java)
        work(payload)
    }

    protected abstract fun work(payload: T)
}

// Here I need to specify ExamplePayload twice:
class ExampleWorker : Worker<ExamplePayload>(ExamplePayload::class) {
    override fun work(payload: ExamplePayload) {
        TODO("not implemented")
    }
}

Why is can't it figure out the type? I would assume it is quite clear, no?

Is there a way to change the name of the variable that holds kotlin objects?

Wait you're not actually stuck, looks like there's a solution targeted for 1.4: https://youtrack.jetbrains.com/issue/KT-11129

That's promising. I'm guessing we're still using 1.3 though, but good to know it's on the horizon.

There should be no ambiguity

you can only seperate declaration and initilization if the latter happens in a constructor or

init

block. in the end they wont be split this way. you can use

by lazy{}

with `val`s

wait why is this?

also kinda seems weird to me that you can have multiple

main

functions in different files but not the same actual function name

also any reason why flows don't have an

iterator()

method?

is there something like a channel but which can have two receivers?

I have a somewhat weird question. say I have following:

fun <E : Enum<E>> foo(clazz: Class<E>): Value<E> = TODO()

fun <T> bar(clazz: Class<T>) {
    if (Enum::class.java.isAssignableFrom(clazz)) {
        foo(clazz) //fails since T is not Enum<T>
    }
}

how do I call foo here? I tried

foo<Enum<*>>(clazz as Class<Enum<*>>)

but it fails since * is also not Enum<*> and it just keeps going recursively. In java I'd just use a raw Enum type, but I can't do that here

Hello! I don't know if this is the place to ask, but I was wondering if there is any way to print the output of a kts scratch file to the console or to somewhere I can copy it. I'm using the classpath of a project I'm working on and the script has external dependencies (cannot be run independently). This is how it looks like:

val now = DateTime(DateTimeZone.UTC)
val inTwoHours = now + Duration.standardHours(2)
println(inTwoHours.millis)

Very simple, I just want to copy the time in millis and put it in another file I'm messing around with. However, when I run the scratch file it evaluates perfectly fine but shows the output to the right of the

println

statement which I cannot copy or select. I really like the ideas of scratch files and I believe it to be an invaluable tool when doing some manual testing and experimentation but I cannot seem to find how to just print it to the normal console. Anyone has any clue? (Using IntelliJ Ultimate)

Hi all, i get an unchecked cast warning on this code:

typealias Factory<T> = () -> T

    private fun Bundle.getViewModelFactory(): (() -> VIEWMODEL)? {
        val serializable = getSerializable(ARG_VIEWMODEL_FACTORY)
        return serializable as? Factory<VIEWMODEL>
    }

Shouldn't

as?

take care of this?

Not sure where to pop this question, either Kotlin or Kotlin Native, does someone have experience with GO integration in Kotlin?

data classes

are not allowed to have non-properties in their primary constructors. otoh this means data classes cannot inherit from classes that require arguments in their own primary constructor. is there a way to overcome this issue? is this really intended? why?

Why is the

crossinline

keyword required ? Is it a real language feature, or rather a technical limitation of the compiler ?