if not Double::class what should I be comparing it to?

I guess this is a workaround although it is kinda jank

Anyone here from the Kotlin coroutine team?

Is there a better way to interop between ruby and kotlin than calling

exec

on a script? I have some CI scripts where I use fastlane but whenver I need to write stuff in ruby it kind of breaks my head

Why there is no `shr`/`shl` for

UByte

?

Second question - if I write

val foo = 0x1u

it's treated as

Int

. Is there a way to make it something else without providing a type? For example:

val foo: UByte = 0x1u

when(foo) {
    0x1u -> {} // doesn't work because 0x1u is treated as an Int
}

I can do

0x1.toUByte()

but it's ugly. Is there maybe something like

0x1ub

suffix or sth like that?

The

use-experimental

compiler argument either does not work as advertised (has a bug) or is not configured properly. Whats the correct way to configure the

use-experimental

compiler argument with gradle (kotlin dsl) such that I do not get warnings for using experimental APIs in my code? Right now I have this

subprojects {

  // ... 

  project.tasks.withType<KotlinCompile> {
    kotlinOptions {
      freeCompilerArgs = listOf(
        "-Xuse-experimental=kotlin.Experimental,kotlinx.coroutines.ExperimentalCoroutinesApi,kotlinx.serialization.ImplicitReflectionSerializer"
      )
    }
  }
}

in my root build gradle file but I still get warnings like in the attached image (both

Flow

and

fun dispatcher.invoke( ... )

are experimental APIs)

since i do not really know how to ask the question (with limited knowledge) how can i setup exposed, squash or any other database library to write and save data classes that may have lists of, maps of or just references to other data classes (i assume multiple tables) and have this accessible in a single function to store and retrieve objects, is there automatic shortcuts or would i have to reconstruct the objects along with retrieving the contained info manually ? does anyone have some example code?

Is there a way of delaying evaluation of string templates ? So if I have this at a class level

val baseURL = "http://$domainName/endpoint"

and then a function like this

fun someMore(domainName : String, somethingElse : String) {
val x = "$baseURL$somethingElse
}

then x should equal http://mydomainname/endpoint/mysomethingElse if I pass in mydomainname and mysomethingelse to the function ?

I saw byte code for

val variable = 90

and in the decompiled bytecode it produced

int variable = true;

. I don't understand this ?

some elegant solution for allocating a not-nullable array as buffer for a generic ringBuffer implementation since I cant use inline reified? The only option I see is to pass down as argument the class itself

Sorry, I just created a channel #junit when I just meant to search for it. It can be deleted (but I can't do that!)

why is the min and max value of Double and Float declared like this: public val MIN_VALUE: Double public val MAX_VALUE: Double

Where as this doesn't.

scoping, my dude

val monitor = useCase.findMonitor(dto.monitorSn)?.also {
            useCase.connect(transform(dto))
        }
        if ( monitor == null ) {
            log.error("monitor {} not found", dto.monitorSn )
        }

is there a nicer way to do the monitor == null as sort of an

orElse { ... }

Is it possible to have a data class that has a java class as a property? Was getting an issue when comparing two equivalent data classes. Found out there was no toEquals/toString override on the java class so it was showing the class@hash value. I added those methods to the class and I see the data classes now have the same values but it’s still failing the comparison.

is a sealed class an abstract class?

I want to chat kotlinx-serialization …anyone know of good channel for that kind of thing?

Hello, World! Any idea if it's possible to show an image in a KDoc comment? Apparently in Javadoc doing

<img src="/doc-files/session-state.png">

worked - but it doesn't seem to work with Kotlin. Ideas?

does kotlin has a equivalent to C#

where T : new()

?

What are people’s favorite Kotlin/Java libraries for providing HTTP/REST APIs?

Hi, guys! What is the best practice to store sensitive user data like passwords (local disk, database) in an app? Does Kotlin have some specific encryption libraries?

I feel like I’ve seen code like this written

deserialize<PatientDto>(message.payload)

where the called method then gets the class

internal fun <DTO : Any> deserialize( ba: ByteArray, clazz: KClass<DTO> ): DTO {
        return mapper.readValue(ba, clazz.java)
    }

pretty sure it’s in gradle’s kotlin DSL somewhere… how do I replicate that calling signature?

if i have a few functions that have a default argument of

onComplete: () -> Unit = {}

would it be best to put this no-op function in a companion object somewhere or does kotlin automatically do any optimizations ?

I have a weird situation and I was wondering if anyone has a solution. I have a couple data classes from a shared library that are structured very similarly.

data class Foo(val width: Float, val height: Float, val x: Float, val y: Float)
data class Bar(val width: Float, val height: Float, val x: Float, val y: Float)

To construct them, I have to write something like

when(clss) 
    is Foo -> constructFoo()
    is Bar -> constructBar()

with each of those construct methods doing the exact same thing (setting the same variable names & types). Is there a structure or something in Kotlin that I can use to make this cleaner?

if i have a getter / setter in java can i override it with a var getter and setter?

Why is

Number

not operable in the JVM? Why did Sun design it that way and why does JB not fix it in Kotlin? Everything (afaik) that inherits from

Number

is operable, so why wouldn't the operators be refactored to be included there?

Hi, It would be nice that extension functions such us

inline fun <T> T.takeUnless

would work lazily and short circuit code execution if condition is true, kind of lazy evaluation of

previous expression

. What's your thoughts? Is it possible at all?