kotlinlang #announcements

Hi.I started to learn Kotlin but my computer doesnt enough to work Intellij.I downloaded Vscode after coderunner extension and Kotlin language extension

1 reply · 2 participants

Hasan

02/21/2019, 3:39 PM

Windows path

6 replies · 4 participants

David Cuesta

02/21/2019, 3:58 PM

Hey Guys!! Just a curiosity... I have realized that when I have a class that is used from another package in a file "a.kt" for example, and I want to add an internal class to the same file "a.kt" I receive an error: "Internal is not applicable to local class". Anyone knows the cause?

3 replies · 2 participants

amadeu01

02/21/2019, 6:35 PM

I just found out http://play.kotlinlang.org/ It remembers me the Xcode playground. i'm wondering is there anything like Xcode Playgrounds to intelliJ wih kotlin ?

:kotlin: 1

8 replies · 4 participants

Danilo Herrera

02/21/2019, 6:52 PM

Is there a way to ensure a generic type is a data class?

:no_red: 2

9 replies · 5 participants

teasp00n

02/22/2019, 2:43 AM

is it accurate to say that coroutines are kotlins implementation of green threading or is it different/ more than that?

4 replies · 4 participants

camdenorrb

02/22/2019, 2:56 AM

How do I enable Kotlin Native optimizations in Kotlin Gradle?

2 replies · 3 participants

elect

02/22/2019, 9:09 AM

is there a trick to assign a value to a variable with a custom setter without triggering it?

7 replies · 4 participants

Animesh

02/22/2019, 12:23 PM

Can any one suggest image tagging library in Android ?

:google: 4

2 replies · 2 participants

Uraniam9

02/22/2019, 2:20 PM

How to test kotlin code in android studio

:google: 4

3 replies · 4 participants

itasyurt

02/22/2019, 3:10 PM

Is there any suggested way to replace this? or should we continue with newFixedThredPoolContext (or java style executors)

2 replies · 2 participants

Rob

02/22/2019, 5:15 PM

abstract class A()
class B(): A()
class C(): A()

fun foo(b: B)
fun foo(c: C)

If I have something like this, a base class with subclasses and overloaded functions, what is the "best" way to call it IF they are stored in a variable of type A?

class Something(val member: A)

val v = Something(B())

foo(v.member) // How to get this to call the right foo

30 replies · 3 participants

Francesco megna

02/22/2019, 7:57 PM

Hi guys, anyone know a good library for Reactive programming in Kotlin? excluding RxJava and RxKotlin wrapper

14 replies · 7 participants

bootstraponline

02/23/2019, 1:37 AM

when I remove the "optional" param, the green run button goes away. Is there an issue tracking this?

3 replies · 3 participants

Hauke Radtki

02/23/2019, 10:33 AM

Is there a way to re-use the kotlin serialization feature to deserialize an object from a Map<String,Any?> ? Since I'm using data classes I can't use delegated properties.

6 replies · 3 participants

igor.wojda

02/23/2019, 4:45 PM

Can

maxDigits

function be simplified? I want to find what is the longest digit in the list and return length of that digit. Method works but can it be done using kotlin stdlib functions without using digit length (

digitCount

) twice ?

val Int.digitCount get() = this.toString().length

fun maxDigits(list: List<Int>): Int = list.maxBy { it.digitCount }?.digitCount ?: 0

17 replies · 4 participants

FalseHonesty

02/23/2019, 4:58 PM

I'm getting a weird error when trying to build a Kotlin project using gradle, where would I ask for support on this issue?

6 replies · 3 participants

muralimohan962

02/24/2019, 4:24 AM

It doesn't work as expected. It will still call the same object's method. The lint warning is correct. This is because a final field of the delegate is created so it can't be modified even though your sent field is mutable.

👍 1

1 reply · 2 participants

Slackbot

02/24/2019, 6:24 AM

This message was deleted.

2 replies · 3 participants

PHondogo

02/24/2019, 9:58 AM

Hello! I have multiplatform project and publish it to maven repository. Now i want in another project's common module to depend on common module of published project. How can I write dependency if there is no common artifact published. Only jvm and js were published.

5 replies · 3 participants

jkbbwr

02/24/2019, 1:16 PM

I want the wrap to behave correctly.

5 replies · 2 participants

jkbbwr

02/24/2019, 1:39 PM

meh

1 reply · 2 participants

Systemkern

02/24/2019, 3:58 PM

@jkbbwr @karelpeeters and @Dico please use threads when replying to messages. This way the main feed does not get spammed unnecessary 😱 Thanks 😀👍

➕ 2

6 replies · 3 participants

Sam

02/24/2019, 4:54 PM

I know there was a plan for compiler plugins for future. As of now, it is possible to have custom annotation applied to kotlin code for java code generation?

7 replies · 4 participants

bjonnh

02/24/2019, 6:31 PM

@Casey Brooks: I'm trying your tutorial (https://dev.to/cjbrooks12/how-to-document-a-kotlin-project-edc) but applied to my project. Everything works fine except that it refuses to read my config.yml . Any idea what could be wrong? It finds the wiki, it finds the README integration, but it doesn't take anything I put in the config.yml

5 replies · 2 participants

Andrew Gazelka

02/24/2019, 6:33 PM

is there any way with delegates to get

KProperty

before

getValue(...)

? I want certain updates to occur before the variable is first accessed, and I need the property name to do this.

2 replies · 2 participants

camdenorrb

02/24/2019, 7:38 PM

Is there any way to get the calling classloader in an package level util function?

12 replies · 3 participants

Rômero Ricardo

02/25/2019, 11:59 AM

Hi everybody, is there any certificate available to be taken for Kotlin? Any recommendation about book and institution specifically for certificate?

3 replies · 3 participants

Jan

02/25/2019, 12:13 PM

is there a way to get a java::class for nullable types for annotation checking?

__class_java.kt

5 replies · 3 participants

thana

02/25/2019, 1:34 PM

is it possible to write a contract where somthing implies, that a method will not return

null

? (all examples i can find implie the other way round)

12 replies · 3 participants

Title

thana

02/25/2019, 1:34 PM

is it possible to write a contract where somthing implies, that a method will not return

null

? (all examples i can find implie the other way round)

LeoColman

02/25/2019, 1:36 PM

I think that if by design your method can either be nullable or no-nullable, depending on a variable

Maybe your design is not correct, and you should refactor the two cases

thana

02/25/2019, 1:36 PM

damn, that would be far easier, thats right 😄

LeoColman

02/25/2019, 1:36 PM

Can you show us an example of what you're trying to do?

thana

02/25/2019, 1:37 PM

in fact you are just right - i should split it into two methods. you know that sitautions where you feel really stupid for not seeing the obvious? 😂

streetsofboston

02/25/2019, 1:40 PM

Oh... we've all been there, Malte! :-D

LeoColman

02/25/2019, 1:43 PM

And we'll be there many more times

Classic http://xyproblem.info/ perhaps?

thana

02/25/2019, 1:49 PM

na not really... the emssage has a boolean flag (which is bad on it's own, too), and when it's

false

it will return a non-null value - always. i knew this smeels before, but then i saw a colleague using it, and he had to use

?.

all over the place and i though "hey this is kotlin! it has a cool feature that might solve this problem" and didn't realise it would be much easier to simply split the method into two

so... maybe.. it's excactly the problem 🤷

LeoColman

02/25/2019, 1:56 PM

I like how Kotlin makes some code smells even more smelly hahaha

😁 1

thana

02/25/2019, 1:59 PM

😄

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