it seems that

CoroutineScheduler

uses

require

that uses

contract

which is experimental

Is there any way to obtain a this reference to a lambda from within itself? Usecase:

val cb ={ event: SomeEventType ->
                 // Do stuff on event
                 callbackList.remove( /* How to obtain reference to self*/)
        }
        callbackList.add(cb)
        // Do stuff that will trigger cb in the list to be called

Think of a list of one-time callbacks.

my build has some "discoverMainScriptsExtensions" tasks (presumably added by Kotlin plugin) that are never UP-TO-DATE. what are those, and how can I get rid of them?

but having basicailly a constant thrown locally feels weird, also a having it in baseUrl() function feels weird .. constant with %s and then string.format?

I wanted to use "when with capture" in the following way:

val b = when(val computed = f()) { computed > 0 -> computed + 1 ; else -> computed - 1 }

but this produces a syntax error. Is the only way really to use

val computed = f(); val b = when {  computed > 0 -> computed + 1 ; else -> computed - 1 }

(with leaking of

computed

outside of the

when

scope)?

In other words, in which cases does a Kotlin library (not) expose

kotlin-stdlib

in its API?

myObj?.let { myOtherObj.property = it }

myObj?.let(myOtherObj.property::set)

I was wondering. I just want to set a variable to other object property if my variable is not null. So, could a do something like above

.let(myOtherObj.property::set)

?

You can reference it's function, using

myOtherObj::property::set

, if I'm not mistaken

I believe that depends on Reflect tho

when will be channels a stable feature ?

Is it possible to still benefit from the code completion; how can IntelliJ pick up that my .kts file is depending on some kind of DSL dependency?

Oh, and also, could you define a union type in Kotlin?

Guys, I think I found a bug in Intellij + Kotlin. I reported it here: https://youtrack.jetbrains.com/issue/KT-29435

How do Kotlin Inline classes compare to other languages' value types (e.g.

struct

in C#, Swift or even plain-old C)? I see there are a lot of similarities between the two concepts (let's say one is

struct

in Swift): they can implement interfaces/protocols, can have properties, methods, and both are allocated on the stack without any memory overhead (please correct me if I'm wrong). What are the differences other than Inline classes can only have one underlying primitive type?

Hello guys! I'm getting the following error when I'm converting an old JAVA class to kotlin: MutableLiveData<LiveDataRetrofitWrapper<?>> cannot be converted to MutableLiveData<LiveDataRetrofitWrapper> Here's where the error occurs:

MutableLiveData<LiveDataRetrofitWrapper> reminders = mRepository.getImportantRemindersByTimestamp(token, timestamp);

And the getImportantRemindersByTimestamp returns this:

val data = MutableLiveData<LiveDataRetrofitWrapper<*>>()

return data

I can understand the error, but I have no idea how to fix it. Thanks!

is it bad form to put a companion object at the top of a class? I always put them at the bottom but for this file, the top is nice

is

x as String

essentially the same thing as doing

(x as String?)!!

?

so, let me see if I got constructors straight... 1. if you have a single constructor then

()

after the classname is not required... 2. however if you have secondary constructors then it is now required 3. and now you might also want to make that constructor private

I had a weird bug today regarding

when

. I have a field that holds an enum value and in another place, I have an (exhaustive) when given that field. So the parameter of the

when

was of type

T

. Then, I changed the field to be instead a

LiveData<T>

. A lot of places in my source threw errors and I fixed them by calling

.value

on the field. But the

when

did not threw an error (as the when does not return anything, the fact that is is no longer exhausive is not an error). But why can I even write:

when(status /* type = LiveData<T>*/) {
   T.FIRST_VALUE -> { ... }
   T.SECOND_VALUE -> { ... } 
   T.THIRD_VALUE -> { ... }

as status can never be any of these types? When I try the same structure with a String as parameter, it throws an error (incompatible types).

I'm porting java to kotlin. i have an interface with a default method. what's the kotlin equivalent of that?

everyone knows if there is a variable declaration standard for kotlin ?

Is kotlinx.serialization stable and performatic enough to be used on production?

hi guys, is it possible to make "copy" of

list

like

data classes

and then change one of its elements? Something like

var list = List<MyObj>
list = list.copy(element = myObj(), index = 3)

for constructors one must initially reference

this(...)

. However, sometimes it requires a bit of code to transform parameters to

...

. Should I... 1) have a separate function which acts as a static constructor 2) have the constructor of the class reference a function

message has been deleted

Kotlin 1.3.20 released We’re happy to announce the release of Kotlin 1.3.20, a new bug fix and tooling update for Kotlin 1.3. In addition to improvements to the compiler and IDE, this version: Allows running Gradle tasks in parallel within a single project … Continue reading →

in a constructor is it possible to say that the default value for something if not defined is the result of a function?

https://gist.github.com/tateisu/d47dd733cba989adc138f1827236f709 I have experience build error on kotlin 1.3.20 .