Trying out https://github.com/msink/kotlin-libui and setup the hello app, but it seems that no run task is being created for

mingwX86

but is created for

mingwX64

What dependency scope is recommended in maven when creating a kotlin library? I thought provided scope made sense to avoid messing with the version of who is implementing. But on github I see most of them use compile scope

hi everybody, im using mockk for mocking the following test fails on the second assertion (returned value is 1 instead of 2). why?

class Test {

    @test
    internal fun name() {
        val mock = mockk<Logic>()
        every { mock.doSth() } returns 2
        mock.doSth() shouldBe 2

        val obj = object : HasLogic {}
        obj.doSth() shouldBe 2
    }
}

interface HasLogic {
    fun doSth() = Logic.doSth()
}

object Logic {
    fun doSth() = 1
}

@hhariri, Thanks alot for adding to server. Don't we have an introduction channel here?

I choose approach depending on required name. For your example with state, because you already have suffix “State” everywhere, I would choose first one. But it’s not always necessary

There's any problem with reverseArray because copiler write that: Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 6 at my.demo.AppKt.invertivett(App.kt:58) at my.demo.AppKt.main(App.kt:47)

https://twitter.com/kotlin/status/1176096398837567488 To iterate lazily over the collection contents, convert it to a sequence by adding ‘asSequence’ to the beginning of the call chain. https://t.co/44THjxYVG0 #KotlinTips https://t.co/EXwUCzqZ9D Twitter

Hello. Can you suggest any Kotlin library for building REST clients (e.g.: kovert, kottpd, javalin, ktor,..) capable of generating client-side interfaces from either `WADL`or

swagger.{yaml,json}

? I'm looking for smth similar to what

wadl2java

and https://editor.swagger.io tools can offer.

any idea if there is an wasy way in kotlin to encode html entities in strings?

Is it intentional that values in the

Double.Companion

are not

const

? I cannot do

const val USE_DEFAULT = Double.NEGATIVE_INFINITY

.

Does Kotlin have something equivalent to Java's

~

operator ( https://stackoverflow.com/questions/1483504/java-what-does-mean )?

when `.copy()`ing a data class that inherits from an open class, the properties/constructor values from the open class are not copied. I understand why, but what is the proper way to do this then?

What does the

kotlin.code.style=official

line in

gradle.properties

actually do? Does the IDE read it?

Is there a playground for playing with Java interoperability? Some kind of an online compiler that accepts both Java and Kotlin code at the same time..

Hi, I have a lot of "Unresolved reference..." compilation problems in my Kotlin project in IntelliJ IDE despite the fact that whole project compiles perfect in bash with maven. Any idea? IDE version: IntelliJ IDEA 2019.2.3 (Ultimate Edition) Build #IU-192.6817.14, built on September 24, 2019 Kotlin plugin version: 1.3.50-release-IJ2019.2-1

Hey everyone, I just joined this slack! Is there a channel for multiplatform discussion and questions? May I make one? answered! Is there a rules channel/FAQ that I can read so I don’t step on any toes? jk found it

Is there a way to shorten this? A 2D range or something…

(0 until width).forEach { x ->
        (0 until height).forEach { y ->
                println("($x, $y)")
        }
}

I would like to write code similar to:

(width rangeBy height).forEach { (x, y) -> println("($x, $y)") }

Note that

width

and

height

don’t come from an iterable object in my case.

is there any way for me to work around that?

class PhotoLibException : RuntimeException {
    constructor(message: String, ex: Exception?): super(message, ex) {}
    constructor(message: String): super(message) {}
    constructor(ex: Exception): super(ex) {}
}

what is the appropriate way to add another property to PhotoLibException?

Are there any plans for the Kotlin standard library to include a

Boolean.toInt

extension function? Some platform libraries use a

Int

like a Boolean, which are often found when using Kotlin Native with C libraries for example.

Because I do a lot of Swift, and am enjoying learning Kotlin as well, I had found a blog post or something that made me feel I could be swift-esque with null pointer safety in Kotlin by using the pattern:

(some.code)?.let { thing ->
  makeHayWith(thing)
} ?: run {
  mournNoThing()
}

(it follows Swift’s

if let … {} else {}

pattern nicely) But I discovered there’s a hole in this that burned us. I should have seen this and feel kind of silly since I did Smalltalk with ubiqutuous block closures for all control flow for years. The let/run pattern breaks down when you do this:

(some.code)?.let { thing ->
  makeHayWith(thing)?.let { hay ->
    bragAboutMy(hay)
  }
} ?: run {
  mournNoThing()
}

If

makeHayWith

returns a

null

, then the return value of the original

.let

block will return

null

, which causes the

run

block to run in addition to the outer

let

block. So what you thought was a nice substitute for Swift’s

if let ... else

pattern has just been turned into a bug waiting to happen. I’m aware of the “smart pointers” described in https://kotlinlang.org/docs/reference/null-safety.html, but these don’t really appeal to me. I like something a little more intentional and universally applied. I rarely use the kotlin let pattern as an expression, almost always as a statement, so I toyed with writing my own variant that returned a distinct type (rather than the closure return type) so that I could through sugary magic do something more akin to the Swift let thing. But I’m not sure I want to stray that far from “idiomatic Kotlin” I guess my question is, is there another pattern that I’m not aware of that I should be considering using?

Anyone working on allowing trailing commas in function/method calls? Gets on my nerves daily

https://twitter.com/kotlin/status/1177183549704663041 Consider providing a paired function returning 'null' together with one throwing an exception. Similar to 'toIntOrNull' accompanying 'toInt'. https://t.co/ZkpOljWO2I #KotlinTips https://t.co/SYg5kcr5sN Twitter

is it an expected behavior to you? encountered it when constructing a DSL for css, tho it's not JS specific https://pl.kotl.in/IUG_K_kLN

If a class is only used from a test, the unused symbol inspection does not mark the class as unsued. Is it possible to fix that somehow?

https://twitter.com/kotlin/status/1177233880060809216 Consider providing a paired function returning 'null' together with one throwing an exception. Similar to 'toIntOrNull' accompanying 'toInt'. https://t.co/kcTTUxdQle #KotlinTips https://t.co/LkAmgR3PA9 Twitter

are unions/sum types a thing yet?

It's not able to infer the type parameter for the unaryplus. Is this a bug or am I missing something?

fun foo(){
	bar(+"test")
	bar(getValue("test"))
}

fun bar(t:Int){

}

fun <T>getValue(p: String):T = TODO()

operator fun <T>String.unaryPlus(): T = getValue(this)

can we get some more upvotes for this question https://meta.stackexchange.com/questions/299920/support-kotlin-in-code-highlighting (and downvotes for the answer probably won’t hurt) to let stackoverflow know if K is popular enough already?

Does anyone else not ever see a cursor in https://play.kotlinlang.org ? I find it kind of difficult to work in it when i just need a quick throwaway editor