Anyone here already done any blockchain (BSC) related stuffs ???

@sam Forgive the ping here, but there's no channel for Tribune or GH Discussions enabled on it I have a question -- I have value classes which get deserialized from primitive values like

String

using Jackson Currently, these are modeled like this:

data class ColumnName
@JsonCreator(mode = JsonCreator.Mode.DELEGATING)
constructor(@JsonValue val value: String) {
    init {
        require(value.isNotBlank()) { "Column name cannot be blank" }
        require(value.all { it.isLetterOrDigit() || it == '_' }) { "Column name must be alphanumeric" }
    }
}

Would the best practice using your library be to just replace the

require()

with

require(parse(value))

?

I can imagine that using ketchup on your hair probably isn't the best of ideas

The more i learn about kotlin, the more i believe it’s the best general purpose language. (Still not my favorite though, Fortran forever <3)

hi folks. I am trying to build a small app to send files from my android to my mac wirelessly. I found out about bonjour that helps discover nearby devices and I was able to detect my MBP from my android. Any hints towards what APIs (desktop + android) I need to use in order to do the actual sharing? I first spotted WiFi-Direct but it seems like Apple doesn’t support it. Anyone has experience with such use case?

any serverless/embedded (like sqlite) database recommendation ? i want to store some configuration data and “states” (think of it as a load/save in a game, except that i’m not making a game but a simulation). Since i’m doing all this stuff for self-teaching purpose, i might as well take something i don’t know. (i’m a database administrator, the only “serverless” dbms i know is sqlite). it’s not specifically kotlin related so i’m just posting it here. (and it’s not that important either since i could make sqlite fit the need). i’ve heard about objectbox.

Hi everyone, I’m currently trying to merge three method calls that alls return a specific subtype of a sealed interface into one call. The idea is to supply the expected result from the outside, so I don’t have to check the result type anymore. Here’s an example:

sealed interface SomeResult {
    data class A(val s: String): SomeResult
    data class B(val i: Int): SomeResult
    data class C(val b: Boolean): SomeResult
}

class SomeService {
    fun request1(): SomeResult.A = TODO()
    fun request2(): SomeResult.B = TODO()
    fun request3(): SomeResult.C = TODO()
}

class MyCurrentImpl(val someService: SomeService) {
    fun blabla11(): SomeResult.A {
        //same setup, just calls request1()
        someService.request1()
        TODO()
    }
    fun blabla22(): SomeResult.B {
        //same setup, just calls request2()
        someService.request2()
        TODO()
    }
    fun blabla33(): SomeResult.C {
        //same setup, just calls request3()
        someService.request3()
        TODO()
    }
    
    //TODO: 
    // Merge all the setup & call into one method.
    // Additionally, supply result type from the outside, 
    // so I don't have 3 when statements.
    inline fun <reified T: SomeResult> getPaymentOptions(): T = 
        when {
            //Error: Type parameter 'T' is not an expression
            //Error: Required: T Found: SomeResult.B
            T is SomeResult.A -> someService.request1()
            T is SomeResult.B -> someService.request2()
            T is SomeResult.C -> someService.request3()
        }
    }
}

The important bit (in my imagination) is, that

T

always has to be of type

SomeResult

, so it’s sealed. Hence I was hoping to somehow iterate over it.. 🤔 Any ideas? Thanks in advance!

I just had one of our API users tell me that

waiting for the connection takes a long time so I use a hard-coded

sleep(5.seconds)

in my code

for users of #coroutines, do you guys find junior developers (or any developers) doing this kind of thing for asyncs? Rather than synchronize properly (maybe because that involves bubbling some future up a call stack or converting a future to a channel for more granular synchronization), they simply insert hard-coded wait statements? I'm kinda mortified. I really don't want to have to explaining concurrency to somebody who works for another company. I want to just say "you're an idiot, call the WaitFor method, and dont ever use this strategy again." Now I have to find a way to put that into an email nicely...

Is there a Kotlin equivalent of numpy's expand_dims?

You could draw two arcs on top of each other.

is there something like mdoc for kotlin? https://scalameta.org/mdoc/ it looks very useful.

in 1.7.10 with jdk 17.0.3

fun main() {
    val v1 : Int = 0
    class t {
        val v1: Int =1
        fun f0() : Int {
            return v1
        }
    }
    
    val t0 = t()
    println(t0.f0())
}

I got 0. Is this correct? I suppose it to be 1.

Code for drawing the triangle

val triangle = Path().apply {
    moveTo(x = x, y = y - indicatorHalfSizeInPx)
    lineTo(x = x - indicatorHalfSizeInPx, y = y + indicatorHalfSizeInPx)
    lineTo(x = x + indicatorHalfSizeInPx, y = y + indicatorHalfSizeInPx)
    lineTo(x = x, y = y - indicatorHalfSizeInPx)
    close()
}

i'm running a poll on coroutines vs reactive in kotlin APIs. Your input would be greatly appreciated. https://twitter.com/evanchooly/status/1577307714367152129

kdoc method link cant resolve methods with same name but different signature? What a bummer..

What keyboard layout do you use? 1️⃣ QWERTY 2️⃣ Dvorak 3️⃣ Colemack 4️⃣ Other

KMM Beta, which seems to be the focus of that upcoming online event was blocked by the new memory manager become good enough to be the default, and so it became in 1.7.20.

Now that's an infinite loop and/or a half

where can we discuss Fleet stuff? it makes sense to have a channel here, where else would you if not here? plus it’s written in Kotlin; thanks

I sent an email to my students today telling them not to include

!!

on assignments, or they would lose points (and their code would potentially throw NPEs). A few hours later, a fellow professor (not of my course) posted to an internal Team:

Are other people getting anxious questions about details in assignments? "Professor, I put two exclamation points after 'Hello world!', will you take off points for that?"

I let him know that, indeed, I would take points off for having two exclamation points in an assignment.

Will it ever be possible to call private members from inline functions?

Quite a few have pinged me about this, so sharing here - we won't be creating a Fleet channel on this Slack for two reasons 1. This is a Kotlin Slack and while Fleet and Kotlin are from the same company, it's not right to mix things. 2. Fleet already has its own Slack which was used during the private preview. You're welcome to now join. If you'd like to, use the following form. https://surveys.jetbrains.com/s3/fleet-slack-sign-up

How long does Dokka take to generate HTML for you guys? on my machine it's taking upwards of 5-10 minutes, and I literally have no functions in a multiplatform module that it's running on. Am I misconfiguring it?

Hello, is there a Fleet channel? I didn’t find any 😞

Hello, does JetBrains gateway support android development on Intellij Idea?

Anyone know of any unofficial/hacky way, I can develop ios/macOs apps on a linux machine using KMP??

so i’m creating a sealed interface but for some reason the exhaustive when clause is kicking in for abstract implementations:

sealed interface A {
    abstract class AbstractA: A
    class B: AbstractA()
    class C: AbstractA()
}

fun x(a: A) {
    when (a) {
        is A.B -> { }
        is A.C -> { }
    }
}

Has anyone else noticed this before? I get a compile error on the when saying i need to add an implementation for AbstractA, even though it can never be anything but B or C since those are the only concrete implementations.