wait that's not right.

I wish

..

were exclusive, it's so confusing to use now.

fixed it

@Dico what if

n == list.size

? 🙂

Given the following sealed class hierarchy:

sealed class LoadRequest<out T> {
  object Pending : LoadRequest<Nothing>()
  class Success<T>(val data: T) : LoadRequest<T>()
  class Failure(val error: Throwable) : LoadRequest<Nothing>()
}

When writing the following code with Kotlin 1.4, I have a warning telling me that the following cast is unnecessary:

val someFlow: Flow<String> = ...
val requestFlow: Flow<LoadRequest<String>> = someFlow
  .map { LoadRequest.Success(it) as LoadRequest<String> }
                                 ^^^^^^^^^^^^^^^^^^^^^^
  .onStart { emit(LoadRequest.Pending) }
  .catch { emit(LoadRequest.Failure(it) }

But removing it makes

onStart

and

catch

incompatible with the type of the returned

Flow

. Is this some new compiler inference bug ?

Idiomatic kotlin preconditions for spring boot Restful API's I would love your feedback on this. If you could contribute any ideas by creating issues and providing constructive feedback, it would be immensely helpful. https://github.com/nextbss/requirekt

3.3

https://twitter.com/kotlin/status/1301486978320551937 The new #KMM developer portal has all you need to know to create cross-platform apps! ✅ Comprehensive tutorials ✅ Convenient docs ✅ Inspirational showcases ✅ How to Introduce your team to KMM Start sharing code between mobile platforms with Kotlin! https://t.co/NTVlF6FW00 Twitter

I just wanted to shout out to the JB team that I am really liking Kotlin 1.4 IDE plugin 2020.2.1. The performance and responsiveness for the 1.4 release feels like the Kotlin plugin has caught up to Java. IntelliSense and indexing feels much faster to me.

I’d like to package a little app I developed

https://twitter.com/kotlin/status/1301848863427514369 Dokka made it to Alpha on Kotlin 1.4! 🎉🎉 ✅ Simplified Gradle configuration with less manual setup ✅ Merge source sets in multiplatform projects Find out more in our blog post and share your feedback to help us keep improving Dokka https://t.co/Ud922Vvte4 Twitter

https://twitter.com/kotlin/status/1301852073126920193 Dokka made it to Alpha on Kotlin 1.4! 🎉🎉 ✅ Simplified Gradle configuration with less manual setup ✅ Merge source sets in multiplatform projects Find out more and share your feedback to help us keep improving Dokka ➡️ https://t.co/aTXkmK2yA3 https://t.co/T7hir4Nljm Twitter

Hey folks. Looks like I am stuck with Gradle 5.1.1 on Travis. It’s throwing me this:

I have a hard time finding which version of org.jetbrains.kotlin.jvm I can use (1.4.0 can’t be with Gradle 5.5.1)

this explains, why?

Hey guys, I’m trying to set up Dokka in a mono-repo that contains multiple Kotlin (v1.3.72) libraries and uses Gradle (v6.4.1). I have a top-level

build.gradle.kts

script in which I apply the Dokka plugin to all libraries -

configure(subprojects.filter { it.parent?.name == "libs" }) {
    apply {
        plugin("org.jetbrains.dokka")
    }
}

I’ve also added the following block that is mentioned in the docs for multi module support -

tasks.dokkaHtmlMultiModule.configure {
    outputDirectory.set(buildDir.resolve("dokkaCustomMultiModuleOutput"))
    documentationFileName.set("README.md")
}

I also have a

README.md

file under each of my libraries under

libs

folder, and I added the following to the

build.gradle.kts

script of each of the libraries which I want to include in the generated docs -

tasks.withType<org.jetbrains.dokka.gradle.DokkaTask>().configureEach {
    dokkaSourceSets.configureEach {
        includes.from("README.md")
    }
}

After running

dokkaHtmlMultiModule

, it seems like I get a folder for each library under

build/dokkaCustomMultiModuleOutput/libs

(with all generated docs inside), but I can’t seem to find any top-level

index.html

file. In addition, none of the libraries are listed in the top level

-modules.html

file. Am I missing something, or doing something wrong? Thanks in advance 🙏

Anybody know how to use the

kotlin-compiler-embeddable

? I see no docs online, neither there is sources attached with it (importing from gradle).

What is nowerdays the recommended way to change the bytecode for a gradle JVM kotlin project?

Hello, I'm struggling with timeouts when using flow. Consider the following snippet:

override fun startScan(
    timeout: Long
): Flow<Result<List<Devices>>> {
    return merge(
        devicesData.foundList.map { Result.Success(it) },
        flow {
            delay(timeout)
            emit(Result.Error(Errors.DeviceDiscoveryError))
        }
    )
        .onStart {
            // Here device discovery is launched, but it's callback based so withTimeout doesn't fit very well here
        }
        .map {
            logger().d("device received here")
            stopScan()
            it
        }
        .catch { e ->
            logger().e("Error: $e")
            stopScan()
            emit(Result.Error(Errors.DeviceDiscoveryError))
        }
        .flowOn(ioDispatcher)
}

What I want is the first item emitted by either of those two flows may finish the returning one and ignore future ones. For example, in this example, if a device is found, the timeout will also be called there emitting another item. I've tried using

withTimeout

and also

coroutineContext.cancelChildren()

when an item is received, but I'm getting into a loop when that's captured in the

catch

block. What should be the best approach for this problem?

Krangl question:

val df = dataFrameOf("strcol") ("s1", "s2", "s3")
val l = listOf("s1", "s2")
// Is there any vectorized version to achieve this filter?
df.filterByRow { l.contains(it["strcol"]) }

Posted in #datascience

It'd be nice if right-clicking IDEA in the windows 10 start menu gave you a selection of projects a-la visual studio. Something tells me it'd have to be a UWP app for that, tho, which I highly doubt would ever happen

https://twitter.com/kotlin/status/1303264345699364864 Use onEach to perform an operation on each element of a sequence in the middle of a call chain. https://t.co/hYyJgqCV2B https://t.co/Ato1bqrri0 Twitter

https://twitter.com/kotlin/status/1303264778346000384 Want to build your first cross-platform mobile app but don’t know where to start? 🤔 The first step is to set up an environment for a #KMM project! 🔖 Check out our guide and learn how to start sharing code between mobile platforms with Kotlin. ➡️https://t.co/AlkwJt4BE6 Twitter

something like MyOne…MyTen

hi, what's the proper Syntax, when a parameter needs to extend multiple classes/interfaces?

hey guys, i am new in this group

Good stackoverflow question about star projections I'd also like to know the answer to: https://stackoverflow.com/questions/63807526/generics-and-inheritance-in-java-library-used-from-kotlin

Hey All, I’m having trouble adding Kotlinx.Serialization to an android project. I’ve created an issue and repository of a small sample. I think I’m not configuring it correctly in my build.gradle files. Would be grateful for any advice! Thanks

is this like the similar problem in java? I spend a long time to understand that one and immediately forget, having to re-learn it every time I face the same problem.