kotlinlang #announcements

Is there some kind of linter that will warn if a class is not annotated as public or internal? I know there's a KEEP somewhere about adding an explicit access mode to the compiler, but I don't think that's done yet.

➕ 2

Dominaezzz

08/15/2019, 10:12 PM

Is there a contract to let Kotlin know that my member `val`'s value will stay the same? Basically I need smart casting to work on

thing

data class Wrapper(val thing: String?)

(from another module of course).

➕ 3

Slackbot

08/16/2019, 8:15 AM

This message was deleted.

Dias

08/16/2019, 9:02 AM

Can someone point me at some sort of article/post which give high level overview of lower level implementation of asynchronous apis please? Like how did callbacks help with async in javascript, what sets actual values in futures/promises, what makes kotlin suspended function resume, does something poll state of suspended function etc etc?

coder82

08/16/2019, 1:22 PM

I wonder if there was a way to add a parent class to another class i cannot control via reflection, I have some generated code I cannot change

K 1

Seri

08/16/2019, 4:49 PM

Is there an adjective for a piece of Kotlin code being more idiomatic? One of my iOS coworkers just pushed a commit message “Made the code more Swifty” and I’m jealous

josh

08/16/2019, 4:56 PM

Time for an emoji poll! 🍅 for "Kotlinesque" 🚀 for "Kotlinify" 😝 for "Kotliny" K for "Kotlinize" K for "Kotlinish"

K 35

😝 2

🚀 4

🍅 4

Jon

08/17/2019, 2:34 AM

Untitled

Jon

08/17/2019, 2:35 AM

I am looking at the implementation of Serializable above and I am unsure how by just applying this annotation, it automatically makes my data class have a new "serializer()" method to it. It doesn't seem like it is doing anything special so this makes me believe there is something hidden happening.

Gunslingor

08/18/2019, 5:26 PM

Any idea how to set this up so spring boot serves images back based on routes?

corneil

08/18/2019, 5:53 PM

You should use "img/name.png"

asad.awadia

08/19/2019, 12:52 AM

Is it just me or the drop down menu that comes in intellij for intellisense/suggestions is painfully slow?

Andrew Gazelka

08/19/2019, 1:50 AM

any alternative to

SendChannel<T>

which does not have a suspending

send

karelpeeters

08/19/2019, 6:27 AM

BooleanArray(64) { (long shr it) and 1 != 0 }

Sergio Pro

08/19/2019, 6:52 AM

Dumb question. I declare a property in an abstract class as

protected var counter: Int

, which is naturally visible in the implementation classes, but not outside. If I try to access protected member from "outside", I get

Can not access 'counter': it is protected in ...

compilation error. This is in Kotlin-only code. However from Java I can see all the protected members as well and can access

getCounter()

and

setCounter()

. Seems like a strange behavior to me and I couldn't fine anything in the docs.

coder82

08/19/2019, 11:02 AM

Does the CoroutineExceptionHandler capture also a CancellatioException in the case of launch? What I would like to do is to launch a bunch of coroutines under a SupervisorJob, and I want to, for robustness, relaunch the coroutine if it fails, but not if it's cancelled.

dasz

08/19/2019, 12:52 PM

Morning, is there a way to detail the inherited property type and still override it from the base class? Example:

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interface A; class AI: A; interface B (val a: A); class BI (override val a: AI): B

conversion from A -> to AI where AI derives from A

naitbit

08/19/2019, 2:56 PM

Style question: I have some text to process that needs some easy one to one replacements. One of the replacement is changing escaped quote

\"

to just quote

...I cannot find a readable way to write that down as Pair. I came up with 3 ways to write that down and all of them are borderline unreadable:

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"\\\"" to "\""

"""\"""" to """""""

Pair("""
    \"
    """.trimIndent(),
    """
    "
    """.trimIndent())

Robert Menke

08/19/2019, 5:41 PM

Is there a go-to way of doing automatic file formatting on save for Kotin in IntelliJ or android studio? I’m sure I could wrangle a custom file watcher but I’m curious if there’s a more standard tool like Prettier in the JS/TS world out there that takes care of it.

egorand

08/19/2019, 6:51 PM

Is there a way to introduce a library-specific experimental marker annotation that serves as an alias to a set of other experimental annotations? Let’s say the library uses API marked with

@ObsoleteCoroutinesApi

and

@ExperimentalCoroutinesApi

and I don’t want library users to opt into using any of those everywhere in their code, just in the scope of my library. I imagine it has to be something like this:

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@Experimental
@UseExperimental(ObsoleteCoroutinesApi::class, ExperimentalCoroutinesApi::class)
annotation class MyExperimental

but the IDE won’t allow me to use

@UseExperimental(MyExperimental::class)

in place of e.g.

@UseExperimental(ObsoleteCoroutinesApi::class)

in the library code. Is there a proper way to set it up? Does this approach make sense?

dumptruckman

08/19/2019, 9:04 PM

Okay. This is weird

asad.awadia

08/20/2019, 12:29 AM

What is the best way to make a kotlin library to share on maven?

LastExceed

08/20/2019, 5:49 AM

what does

XY is marked unstable

mean?

thana

08/20/2019, 7:51 AM

is there something like go present (https://godoc.org/golang.org/x/tools/cmd/present) available for kotlin?

evanchooly

08/20/2019, 2:53 PM

https://javap.yawk.at/

Guru

08/20/2019, 3:18 PM

Copy code

fun main(args: Array<String>) {

    val subt1: SubServiceType.SUBT1 = SubServiceType.SUBT1(SUBT1Type.SUBT11)

    val gson = Gson()
    val str = gson.toJson(subt1, SubServiceType::class.java)

    val strJson = "{\"mainServiceType\":\"SUBT21\"}"

    val objSubt2Type = gson.fromJson(strJson, ??) //<- PROBLEM IS HERE
}

enum class MainServiceType(value: Int) {
    MAIN(1),
    MAIN1(2)
}

interface I1{
    val value:Int
}

enum class SUBT1Type(override val value: Int) : I1{
    SUBT11(2),
    SUBT12(3)
}

enum class SUBT2Type(override val value: Int) : I1 {
    SUBT21(2),
    SUBT22(3)
}

sealed class SubServiceType(val mainServiceType: I1) {
    data class SUBT1(val subServiceType: SUBT1Type) : SubServiceType(subServiceType)
    data class SUBT2(val subServiceType: SUBT2Type) : SubServiceType(subServiceType)
}

I am having a problem in serializing this JSON string for sealed class. Any help please?

jaguililla

08/20/2019, 5:20 PM

Hi, do someone knows of any Kotlin linter which allow you to fail the build if you have imports of a given package in another's package code?

👍 1

LeoColman

08/20/2019, 10:07 PM

Doing

nullable?.let { list + it } ?: list