Hi. I'm working on a compiler plugin (DI library) that alters IR to generate a constructor injection. When some file A changed and incremental compilation kicks in I need a way to tell compiler to recompile file B as well, though before my meddling with IR there was no dependency between them. Is it even possible?

Hi all, I have just released a ktoml library (0.2.6) to Maven Central. It is a fully Kotlin native serialization library for TOML configuration language. It was requested by Kotlin community, but unfortunately I am developing this alone in my free time. I would like to ask for your help in testing/contributing to this project. Or at least give it a star to make it look more attractive for new contributors. Thanks! 🙏 I know that Kotlin community - is the best in the world and I appreciate your help ❤️

I’m running Ktor and log output is a bit too much. Is there any way to filter console log output in Intellij?

abstract class Single implements View.OnClickListener {} this java code how to use kotlin express?

class C{ 
var l: () -> Unit = {println("hello")}; 
fun onClick(){ l() }}
val c = C()
c.l = { println("world") }

is this ok?

by the way, why ``` can't format code any more? slack changed it?

Hi, can anyone point me in the direction of a blog that explains how to setup and work (in intellij) on a gradle kotlin group of projects that share code. Multiplatform projects, unless I'm mistaken are focused on sharing code between several platforms, but the one project. I'd like to see for example, the creation of a shared library, that can be developed on its own and consumed by multiple other projects (regardless of mono or seperate repo) without having to build and publish to a local maven or some artifact tool. The key is to be able to enhance shared code while working on other projects that consume this shared code, and have intellij aware. I have tried importing code that has gradle includeBuild syntax, but have never succeeded in getting intellij to see these included source files. My use case; I'm working on a project that has 2 backend services in micronaut and a few cli apps. And one day, a jetpack compose GUI hopefully. I'd like to share a lot of common code in data classes, SQL jdbi, and general functions. Any recommendations?

Last time I was using Jacoco for code coverage with Kotlin it was not very comfortable to use it – numbers were way off because coverage is calculated on byte-code level and it included all the getters/setters generated by Kotlin. Did situation improve since then? Anything good to measure code coverage in Kotlin projects?

Most common words in Kotlin files. Sadly android > fun

Hey Gang, I was looking into

Multiplatform Programming

and it says it’s in

alpha

does the same go fo

Kotlin for Javascript

? I’m looking to create a package that will build for JVM and JS to reduce duplicate business logic.

So just out of curiosity I wanted to test how long a simple

QuickSort

implementation takes vs. Kotlin's own

List<T>.sorted()

. While I was on it, I also tested variations of my implementation as an extension function and without explicitly storing values in the function. And I noticed they are very different in how fast they are processed. What is causing this? See thread ->

Is

listOf(…).map { async { someNio() } }.awaitAll()

discouraged for any reason? I came across the “worker pool” pattern.

Hi. I'm using delegates outside of fields. This produces a warning

ASSIGNED_BUT_NEVER_ACCESSED_VARIABLE

upon assignment only. While that warning is technically correct, and makes sense, it would be nice to remove it. How? My code looks like this:

var ok by okProp
ok = true

where setting

ok

will have side effect. Example: https://pl.kotl.in/81eXfsXLG (press run to get the warnings). On a side note, the decompiled code looks like this:

KProperty var1 = $$delegatedProperties[0];
ReadWriteProperty ok = okProp;
ok.setValue((Object)null, var1, true);

As one would expect the variable will be both accessed and assigned, just not in Kotlin

How Can I add CSS to developer documentation? We can use html in multi-line comments like below, but i would also like to use external css for html used inside multi-line comments. How can I achieve this? Thanks

Is https://github.com/JetBrains/kotlin/blob/master/ChangeLog.md going to be updated? Looking for recent releases is a pain if you don’t know the exact tag (https://github.com/JetBrains/kotlin/releases is flooded with dev releases) and it’s nice to have a one link to refer to for changes

i've been forced to write in python for the last couple weeks, and i keep on having to use some strange combination of iteration functions to to, for example, get the first element matching a predicate, or to iterated with a window through a list. every time, i wish i could just use kotlin 😢

hi i have a strange behavior from Kotlin both IntellJ Community Edition and Android Studio is using Kotlin 1.5 ,

var paymentMethod: String? = null
var result = paymentMethod?.takeIf { !it.isNullOrBlank() } ?: let { "-" }
println("output " + result)

The let part is working fine is android studio . However it is showing error in Community Edition. Is this expected or some strange behavior ?

I have strange behaviour when accessing value class properties from java. Any idea why?

📣📣📣 Hi everyone <!here>! This is just a friendly reminder that you have until July 20 to share your feedback about our Slack Community updates and apply to be a moderator. https://kotlinlang.slack.com/archives/C0922A726/p1625206471145200

I am probably too sensitive to be a moderator...

Hello. I am working through the Kotlin Koans and currently at https://play.kotlinlang.org/koans/Collections/Fold/Task.kt. Am I understanding the problem correctly in that Shop.getProductsOrderedByAll() should return a set of products that were purchased by all of the customers? Therefore, if there is at least one customer who did not purchase a product, then that product should not be part of the resulting set?

Hey all, I'm not really understanding how to harness the full power of trailing lambdas, I'm fairly certain it's what I want but I'm also open to being wrong. I am fairly Inexperienced with Kotlin so please take me to school if you need to! I am trying to mimic behaviour that I noticed in Ktor's HTTP Client when it comes to applying the

body

parameter, but in my own abstraction of a client for a particular service endpoint. Basically, I have this function (fluff removed), but point is clear.

sendNotification(listOf("..."), listOf("..."))

This is ultimately fine and works as intended, but I am trying to find a way to explicitly set each of these values. Instead I'd like to do this:

sendNotification() {
    subscriberKeys = listOf("...")
    users = listOf("...")
}

This helps me describe exactly what I need each value to be and then pass them through the implementation, I just don't fundamentally understand the examples provided. I've tried with some smaller sample code but nothing quite clicks yet. I'll gladly accept links to helpful resources too, I've done a fair amount of searching but nothing has quite illuminated the lightbulb on this.

Hey all, is possible to simplify this code either using when or some other idiomatic way in kotlin,

private fun hideDeliveryDetailsIfNotRequired() {
    if (clearingZone.title == "-" && deliverMethod.title == "-"
        && deliverTo.title == "-" && pickupLocation.title == "-"
    ) {
        clearingZone.visibility = View.GONE
        deliverMethod.visibility = View.GONE
        deliverTo.visibility = View.GONE
        pickupLocation.visibility = View.GONE
    }
}

Does anyone have an example of using a ConfigurableJacksonXml? How do I get http4k to use my mapper rather than the default?

Multiplatform Gradle Plugin Improved for Connecting KMM Modules If you use Kotlin Multiplatform Mobile (KMM) for sharing code between iOS and Android, you will at some point have to decide how you will deliver the shared module to your platform projects. While Android integration is smooth out of the box, iOS integration can require some additional setup. In this post, you will learn […]

Is there any channel specifically for KMM questions?

What would be the difference between the following code snippets?

class Dummy{
    private val _data = mutableListOf<Int>()
    val data:ListOf<Int> = _data
}

class Dummy{
    private val _data = mutableListOf<Int>()
    val data: ListOf<Int>
        get() = _data

Thanks for your help.

Hi Is there a way to intersect an unknown number of list ?

hello! 👋 Has anyone seen this issue on CI?

[kapt] 'com.sun.tools.javac.util.Context' class can't be found ('tools.jar' is absent in the plugin classpath). Kapt won't work.