When you declare lots of extension functions instead of class members, you end up with very many imports. And extension functions are very common in stdlib,

kotlin.cinterops

for kotlin native,

kotlinx.coroutines

, and most other projects that use a similar style in this respect. I wonder if people would support the idea that importing a type should also import extension functions of that type that reside in the same file or package. This would mean that if you import

CoroutineScope

, you don't need to import

launch

or any other builders other than

runBlocking

. What do you think?

I’m preparing an internal workshop entirely based on Kotlin Koans and I’m having a really bad experience with the online version - in some cases the Run button just does nothing. The browser console displays the following error:

Uncaught TypeError: Cannot read property 'execute' of null
    at Object.onRun (main.js:148)
    at main.js:148
    at Object.<anonymous> (main.js:132)
    at p (main.js:132)
    at main.js:132
    at C (main.js:132)
    at O (main.js:132)
    at A (main.js:132)
    at S (main.js:132)
    at L (main.js:132)

Hi) Do you know any Mapstruct alternatives what work with Kotlin Data classes?

without package private visibility, what are my options to restrict use of a class to the same package (i.e. spring has a way to map exceptions to http status codes via annotations, I want to make sure that these are only used from the controllers)

Is there some API in stdlib to do that in a cleaner way?

@Suppress("UNCHECKED_CAST")
pairsListOfNullableApiParamAndNullableString
        .filterNot { it.first == null || it.second == null }
        .map { it as Pair<ApiParam, String> }

hi there Im trying to understand why this

var externalId: String = ""

code provide to me this kind of object wrapping. but when I`m trying to set this value in

data class Id(var externalId: String)

it actually tooks 16332. And I “miss” my reference I can’t understand why this ref$ObjectRef appears Advice pls some documentation page about this

Shouldn't this show some unchecked cast warning?

Is there any particular reason for

Random

to not have range-based float generation?

I can’t figure out why this is happening on my class, while is not happening on a

MutableList

, for instance 😕

Latest Intellij plugin

1.3.20-release-IJ2018.3-1

seems to break compiling in Intellij for me. Compiling via command line gradle works. Beginning of error snippet is:

Error:Kotlin: [Internal Error] java.lang.IllegalStateException: Backend Internal error: Exception during code generation
Cause: Back-end (JVM) Internal error: wrong code generated
org.jetbrains.kotlin.codegen.CompilationException Back-end (JVM) Internal error: Couldn't transform method node:Error:Kotlin: [Internal Error] java.lang.IllegalStateException: Backend Internal error: Exception during code generation
Cause: Back-end (JVM) Internal error: wrong code generated
org.jetbrains.kotlin.codegen.CompilationException Back-end (JVM) Internal error: Couldn't transform method node:
create (Ljava/lang/Object;Lkotlin/coroutines/Continuation;)Lkotlin/coroutines/Continuation;:

how do people feel about shading the

stdlib

dependencies when publishing libraries written in kotlin?

i have a data class with a lot of properties. I need to create that class from java code, but I don't want to pass 800 nulls in the ctor. is there a cleaner way around that? @JvmOverloads doesn't seem to like data classes

how can I get the value of a field, when I only know the name of the field (as a string)? I don’t see an example in https://kotlinlang.org/docs/reference/reflection.html

@ParameterizedTest
    @ValueSource(strings = [ "emr", "packet_100hz", "packet_1hz" ])
    fun channel( channel: String ) {
        assertThat( Channel::class.java ).hasPublicFields( channel.toUpperCase() + "_NEW" )
        assertThat( Channel::`channel`.get() ).isEqualTo( channel + ".new" )
    }

Hi I know that is not directly related with kotlin but does anyone know why

LocalDate.parse("2000-02-31", DateTimeFormatter.ofPattern("yyyy-MM-dd"))

parses to

2000-02-28

?

Ktlint is broken with 1.3.20 FYI....I had to roll us back because of that...

i got a JNI error and invalid callstack errors trying to assign string to continuation or so

is there any code completion for kotlin on atom? coming from golang where i had a full ide in atom.

Hmm. I'm disappointed in kotlinc compiler magic.

do {
  val x = true
}
while(x)

works but

do try {
  val x = true
}
finally {}
while(x)

does not. Can i log this as a bug? Or an enhancement?

is there a way to access the receiver's private members?

1.3.20 compiler & gradle plugin with 1.3.11 lib dependencies…

is there a shortcut for

val a = try { myfun()} } catch(T: Throwable){ null }

Hello 🙂 Is there a guide or some example on how to sign and setup the artifact for mavenCentral in a multiplatform project using Kotlin version 1.3.20 and Kotlin DSL? Following the new guide I was able to avoid artifacts duplications when multi-step-publishing (even tho there is an error in the guide,

OperatingSystem.current().isLinux

is the correct way to chech the OS). Now i just need to sign all of them and configure the

publishing

extension lambda. The project is this one: https://github.com/lamba92/kotlin-extlib

Hi guys, I'm trying to use JPA specification with kotlin, but I'm having compilation errors... Has anyone have good example to show ?

I need a good logging library, should I look only in the java world? or is there a good Kotlin logging library?

Timber is pretty great, and I think has a Kotlin variant (pretty sure it supports multiplatform now?)

I have a class hierarchy that represents an AST and I would like to model it with sealed classes to get exhaustion checks in when-expressions. Unfortunately that means I have to put all classes into a single file (which would be several thousand lines long). My idea was to make them all completely abstract (an interface basically) and then move the implementation to Impl classes. The problem with that is that I would no longer be able to inherit implementations (since Kotlin only supports single-inheritance). Is there any more elegant solution than to delegate all the inherited methods manually? Or should I give up on sealed classes completely and use a visitor instead? (I hate visitors but they do have the advantage that client code would still compile when new elements are added to the AST. Although you could achieve the same thing by adding an else-clause to a when-expression despite exhaustion and when-expressions are much more natural to use)

всем привет как сделать двойное нажатие? есть обработчик или надо писать функцию?

Do you know of any project that is trying to use Flutter with Kotlin instead of Dart?

Does anyone have a guide on how to use the

shadow

gradle plugin with kotlin? I’m attempting to package kotlinx serialization with my gradle plugin and I can’t figure out the syntax.