ctor(): this(arg) { body...}

change placement of this()

whats the error

⚠️ Kotlin Playground service is returning 503

Kotlin compile server is temporarily overloaded

https://twitter.com/kotlin/status/1185209063325327361 You can check whether the 'lateinit' property was initialized using 'isInitialized' on the corresponding property reference. #KotlinTips https://t.co/jruI0ZGzaz https://t.co/VWoOQPexju Twitter

This is kinda a shot in the dark but there’s a good community of developers here so figured I’d ask. Anyone know of any good analytics libraries for macOS that work with non-UI applications?

How would that kind of stuff behave with Kotlin? https://www.key-project.org/

HI All , I am getting this error java.lang.ClassCastException: reactor.core.publisher.FluxMapFuseable incompatible with java.lang.String do you have any idea at org.springframework.cloud.function.context.config.KotlinLambdaToFunctionAutoConfiguration$KotlinFunctionWrapper.invoke(KotlinLambdaToFunctionAutoConfiguration.java:147) ~[spring-cloud-function-kotlin-3.0.0.M3.jar:3.0.0.M3]

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mutableListOf(0,0,0,0,0)

or

MutableList(5) { 0 }

what is going wrong

On an android project

Didn’t used to be like this

I have a sample code written using coroutines and channel (really just taken from documentation), but when run you can find, what it looks like, weird patterns. In the below example, All co-routines, except the one with id=0 get the exact same number of messages. Moreover, co-routine with id 0 always get 2x number of messages compared to other co-routines. https://gist.github.com/harikb/cb98f55855d8f947aa44b964876b8200 . Is there something simple/rookie-mistake I am making?

https://twitter.com/kotlin/status/1186643455532883968 Want to quickly print extended information about a Kotlin/JS object in your browser's dev tools? Use console.log instead of println. https://t.co/Stx1816hy2 Twitter

KotlinConf 2019 Global: Join In! 2019 has been amazing for the Kotlin community with developments like the language of choice on Android, a wave of Kotlin/Everywhere events, Breakout Project of the Year at OSCON ’19… and the year is not over yet. Today we reveal … Continue reading →

I have a generic class: Slot<T>. I’m trying to add extension

var

to it when/where T is Comparable. The syntax is eluding me. I tried: var <T : Comparable<T>>Slot.concisely:T get() = this.value set(newValue) { if (this.value != newValue) { this.value = newValue } } But I’m getting a “Type property of parameter must be used in property type”. What am I missing? I’m guessing a bit at the syntax based this snippet seen in the documentation: fun <T : Comparable<T>> sort(list: List<T>) { ... }

Nevermind, it’s always after you ask. Appears to be

var <T : Comparable<T>>Slot<T>.concisely:T

is the correct syntax. I think I see why.

what is the idiomatic Kotlin way to decompose little endian integers of various widths from (U)ByteArrays?

Hiya!

The kotlin no-arg compiler plugin confuses me... I've got this plugins block,

plugins {
	id 'idea'
	id 'org.jetbrains.kotlin.jvm' version '1.3.50'
	id 'org.jetbrains.kotlin.plugin.allopen' version '1.3.50'
	id 'org.jetbrains.kotlin.plugin.spring' version '1.3.50'
	id 'org.jetbrains.kotlin.plugin.noarg' version '1.3.50'
	id 'org.jetbrains.kotlin.plugin.jpa' version '1.3.50

and the

jpa

plugin is supposed to annotate the

javax.persistence.Entity

annotation to have a no-argument constructor.

I get that this constructor is synthetic, meaning it can't be invoked via Kotlin / Java code, but can be via reflection.

Runnning

Company::class.createInstance()

where

Company

is an

@Entity

causes an

IllegalArgumentException

with the message "Class should have a single no-arg constructor" 🤔

Company

is defined as,

@Entity
@Table(name = "company")
data class Company (
	// ...

Any idea what I'm doing wrong? 🤔

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umpol *

Having this :

sealed class ResultWrapper<out T> {
    data class Success<T>(val data: T) : ResultWrapper<T>()
    data class Unauthorized<T>(val exception: UnauthorizedException) : ResultWrapper<T>()
    //More error classes
}

I could not get the T when I was using

ResultWrapper.

I was using like :

when(function) {
 is ResultWrapper.Success -> DoSomething
 is ResultWrapper.SomeError -> DoSomething

And I realized that I could not use the value of the return of it, so I found this sealed class

sealed class Either<out L, out R> {
    //Failure
    data class Left<out L>(val value: L) : Either<L, Nothing>()
    //Success
    data class Right<out R>(val value: R) : Either<Nothing, R>()
    val isRight get() = this is Right<R>
    val isLeft get() = this is Left<L>
    fun <L> left(a: L) = Left(a)
    fun <R> right(b: R) = Right(b)
}
fun <L, R, T> Either<L, R>.fold(left: (L) -> T, right: (R) -> T): T =
    when (this) {
        is Either.Left  -> left(value)
        is Either.Right -> right(value)
    }
fun <L, R, T> Either<L, R>.flatMap(f: (R) -> Either<L, T>): Either<L, T> =
    fold({ this as Either.Left }, f)
fun <L, R, T> Either<L, R>.map(f: (R) -> T): Either<L, T> =
    flatMap { Either.Right(f(it)) }

And with this I can do it, the thing is I was using this :

inline fun <reified T : Any> execute(requestFunc: () -> T): ResultWrapper<T> =
        try {
            ResultWrapper.Success(requestFunc.invoke())
        } catch (exception: Exception) {
            when (exception) {
                is UnauthorizedException -> ResultWrapper.Unauthorized(exception)
                is NetworkException -> ResultWrapper.Network(exception)
                is BadRequestException -> ResultWrapper.BadRequest(exception)
                is NotFoundException -> ResultWrapper.NotFound(exception)
                else -> ResultWrapper.Error(exception)
            }
        }

And then trying to move it to

Either

I'm having problems since I have to do something like

reified T,R

and the return is

Either<T,R>

but then trying to do

Either.Right(requestFunc.invoke())

is saying that is expecting a T,R and I'm only returning T. Any ideas how to achieve it?

Would

constructor

annotation use-site target make sense? So instead

class Example @Inject constructor(<params>)

we could write

@constructor:Inject 
class Example(<params>)