kotlinlang #announcements

Hey all, have a quick question: if I have a class which has a property whose type will always definitely be a certain type, is there a way I can specify that in my code so I don't have to do exhaustive when checks constantly? I tried using

as

but I couldn't get it to work, probably doing it wrong. My use-case:

Untitled.kt

Smallville7123

03/24/2019, 3:14 PM

how can i optimize this https://bpaste.net/show/a82700459fc2

Slackbot

03/24/2019, 8:17 PM

This message was deleted.

:stackoverflow: 1

Smallville7123

03/24/2019, 8:23 PM

Anyone make macro preprocessors?

sitepodmatt

03/25/2019, 2:16 AM

val x: () -> Any? = @Repeated(5) {
            "hi"
        }

        // test if x has annontation
//fail       
        println(x::class.java.annotations.first() as Repeated)

03/25/2019, 2:28 AM

are source links broken on the API docs again?

David Cuesta

03/25/2019, 9:26 AM

Hey guys, Is there any tool/plugin to auto-generate ApiDoc.yaml that integrates with ktor?

thana

03/25/2019, 10:38 AM

is there a way, to make a method tailrecursive. when the return is nested in a return?

standinga

03/25/2019, 1:17 PM

and would like to have it in the bottom of the file, but this is not possible due to "variable must be initialized" error

standinga

03/25/2019, 2:16 PM

I would like to be able to have listener below init

-.kt

dumptruckman

03/25/2019, 2:22 PM

Running into a new problem trying to run some unit tests with Kotlin. I’m making a change to a class in my main code set and when i rerun the test, it is not detecting the changes and is giving me the same error I had before the change. Even adding a println just before that line and now the error points to the printlin. I’m running the tests in IntelliJ. Anyone else run into this?

rook

03/25/2019, 4:13 PM

Is there a way of writing

infix

functions that allows the left side to be implied by the context? For example, in

apply

🇳🇴 1

wathek

03/25/2019, 5:37 PM

Hi wonderful people, I have been wondering whether there is a difference between using

as

and setting the type of a variable, for instance:

val ids: List<Int> = environment.getArgument('ids')

val ids = environment.getArgument('ids') as List<Int>

Kompass

03/26/2019, 5:38 AM

@here Hello everybody 😊 I have a small problem with reflection and I will be grateful if someone will suggest possible directions for its solution.

Tsvetozar Bonev

03/26/2019, 8:22 AM

Does anyone know if the AppEngine standard environment supports kotlin coroutines?

Jakub Aniola

03/26/2019, 9:46 AM

Are coroutines available in Kotlin 1.3 stdlib? When I am looking into coroutines tutorial in documentation (https://kotlinlang.org/docs/tutorials/coroutines/coroutines-basic-jvm.html) it is telling me to add kotlinx to gradle/maven. I am compiling Kotlin in CLI without gradle/maven, so is there possibility to use coroutines in that case?

Stephane M

03/26/2019, 10:53 AM

Hello everyone, finally did the Kotlin plunge from Scala and Java, and it's been awesome! Writing a TornadoFX app right now, and it's delightful. Looking forward to learning more

👋 3

:kotlin: 6

arekolek

03/26/2019, 11:23 AM

Is it possible to use

@Deprecated

annotation while having enabled

allWarningsAsErrors = true

-Werror

? As far as I can tell it’s impossible, but maybe I missed something?

Smallville7123

03/26/2019, 3:49 PM

https://github.com/mgood7123/kpp

Jakub Aniola

03/26/2019, 5:42 PM

Is there possibility to run Kotlin code in CLI with main inside the class (in companion object or object)? I know, main it would run with main outside the class 😄 As far as I understand that second answer to that question https://discuss.kotlinlang.org/t/is-the-main-function-must-be-a-standalone-function/877 it should work

asdf.kt

dumptruckman

03/26/2019, 6:11 PM

How come IntelliJ doesn’t show deprecated Kotlin methods with a strike through in java code? Am I missing something?

Smallville7123

03/26/2019, 6:20 PM

How can I make a method callback whos parameters can be redefined wiithout using a varargs <Any> parameter

03/26/2019, 7:11 PM

you could file a bug for the missing inspection. ISE should become check, IAE should be require, null checks for either should be checkNonNull/requireNonNull

➕ 5

Ruckus

03/26/2019, 7:35 PM

Is there any difference (at runtime) between

import javafx.scene.paint.Color`

and

typealias Color = javafx.scene.paint.Color

Ruckus

03/26/2019, 7:36 PM

In the same vein, what about

import javafx.scene.paint.Color as ColorFX

and

typealias ColorFX as javafx.scene.paint.Color

Bruno_

03/26/2019, 8:30 PM

how do you extract common configs/dependencies in gradle kotlin dsl? The problem I have is that in my

buildSrc

I can't for example configure sonarqube because of some properties missing

wrover

03/27/2019, 9:07 AM

Is there a way to write an adapter for a coroutine to intercept cancellation in order to encapsulate nonstandard behavior, e.g. close an underlying socket to interrupt blocking method?

dmcg

03/27/2019, 10:32 AM

Is there anyone with a deep knowledge of Kotlin generics who could help me out with the API for #minutest? I’m trying to find the least worst solution to a co/contravariance conundrum.

ribesg

03/27/2019, 11:01 AM

Is there a way to have a

var

without backing field where the getter returns an optional value while the setter requires a non-optional one? Or am I just blocked on using 2 functions?

Title

ribesg

03/27/2019, 11:01 AM

Is there a way to have a

var

without backing field where the getter returns an optional value while the setter requires a non-optional one? Or am I just blocked on using 2 functions?

diesieben07

03/27/2019, 11:04 AM

So you want getter to return

Foo?

but setter to only accept

Foo

ribesg

03/27/2019, 11:04 AM

Yes. It’s doing some reflection behind the scene and there may not be a value at first, unless it has been set once using the setter. Being able to manually set a null value does not provide any value

diesieben07

03/27/2019, 11:06 AM

Then you can't use one var

Czar

03/27/2019, 11:11 AM

You could use

lateinit var

or add a

requireNotNull

check in the setter. Both seem a bit dirty to me though. See if you can refactor this somehow.

ribesg

03/27/2019, 11:26 AM

In the end I did (much) more reflection to go and find the default value that is affected to the field

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