why can't I do some like

typealias Nullable<T> = T?

(it's kinda useless, but I have to do similar one)

https://stackoverflow.com/q/61791680/11377112 somebody know how should I approach this? How should you tackle situation where there is multiple interfaces decalre default parameters in their function decalration. I've also put a reproducible example corresponding to kotlin playground in there.

Hi there 🙂 Do you guys know how to deprecate stuff that is not easily replaceable with another line of code? I am cleaning up a legacy app and there are a few constructs that I want to phase out. Example: Lets say I have an app where the old way of accessing the database is done via type-unsafe results like

Array<Any?>

. There are helper methods that type juggle the return values like so:

fun Any?.toIntOrZero(): Int = (this as? Long)?.toInt() ?: (this as? Double)?.toInt() ?: 0

This is of course horrible, so I want to deprecate all of these helper functions, so that any developer sees that this is not the right way to do things:

@Deprecated("use the new type safe db repository instead of this manual type-juggling (see readme.md for refactoring advice)")
fun Any?.toIntOrZero(): Int = (this as? Long)?.toInt() ?: (this as? Double)?.toInt() ?: 0

But now there is a warning, that the replaceWith parameter of the deprecation annotation is missing. But there is no simple replacement of this, since every database access needs to be refactored and cleaned up individually. this helper function is just a symptom of the problem, so to speak. So is this ok, just to slap a

@Suppress("DeprecatedCallableAddReplaceWith")

in front of this deprecation annotation and call it a day? Or is there a better way to do this?

Is there sth in kotlin to map all counties special characters like:

ó

->

o

ł

->

l

I can’t see in

contains

function to ignore them.

Does anyone know whether the new slack app is native?

if I want to create enums from strings, where the string value does not correspond to the enum name, and I want to scope the function to the enum, and I do not want to create an extension function on

String?

, what is idiomatic kotlin for it?

How do I tear off a function from the companion object of a class? I'd expect this to work:

fun main() {
    listOf("yes", "no").filter(SomeClass::filterYes).forEach{
        println(it)
    }
}

class SomeClass {
    companion object {
        fun filterYes(str: String) = str == "yes"
    }
}

but it doesn't. You can try it here: https://pl.kotl.in/sHlk5l7V0

Is anyone using kotlin for non-android, non-js, non rest-api style dev work?

can anyone think of a more idiomatic way to do this?

if (error != null) throw error

How are people working around

Please set environment variable JDK_16 to point to JDK 1.6 installation

Kotlin repo build failure on macOS Catalina?

Something is still using JDK 1.6?

If I have a KProperty of

KProperty<Type, Field>

, is it possible for me to get the specified field of

Type

? so like if we have

data class Foo(bar: String)

fun main() {
  val foo = Foo("baz")
  val whatWeWant = Foo::bar
  println(foo.(whatWeWant)) // prints baz. unknown syntax
}

i thought android studio is more advanced, has more flexibility/tools

Because people use Mac more than Windows, do they? 🙄

is following possible in kotlin? if not, what will be the kotlin way to do it

while (isalnum(LastChar = getchar())) {
    IdentifierStr += LastChar;
}

taken from c++.

Does anyone know what does this task

inspectClassesForKotlinIC

do for Kotlin in Gradle?

I find kotlins regex kind of complicated. Usually I use it to find the first match, but it seems I don't understand something about how it is supposed to work because the code looks kind of awkward:

regex.find(line)?.groupValues?.getOrNull(1)

Is this the correct way to find the first match of a regex result?

Any guys working on some cool open source project? I got fired and honestly I am bored as fuck, enough Call of Duty for me. 😂

I juste noticed that it's actually impossible to write the following:

for (n in 0.0..1.0 step 0.1)

I know that floating point numbers are imprecise and such a for loop should be avoided. Is this why there is no such construct ? Or are there any alternatives ?

in general there are two common ways to handle errors: • throw exceptions, and catch them somewhere else • return a object that contains a successful value OR an error (e.g. with an

Either<>

class)

Operator

component0

compiled successfully. How it can be used as operator on practice? On playground

Hello, I've got a sealed class like below and I'm struggling to use the Empty state in Java. Any advice? Calling

State state = State.Empty;

gives "expression expected". Am I missing something obvious?

sealed class State() {
    object Empty : State()

    ...
}

Any strong reasons to not do something like that

private val channel = Channel<Event>()
val events = flow { emit(channel.receive()) }

Use the channel inside a class to expose an api to emit values and receive those values else where as a flow?

Does anyone have recommendations to build a fast (graal native?) cli app with Kotlin? I'm looking for something to prompt the user with options (a select field) and don't want to use --parameters. Thanks! I thought about spinning up a quarkus command app and add some kind of cli framework to it (picocli, clikt) but it seems that those two frameworks work with supplied parameters and not with prompts.

val a = Regex("foo")
a.replace("foobar", "\\w")
res3: kotlin.String = wbar

i would expect this to return

\\wbar

- am I missing something here? Isn't

\\

an escape for the

\

?

What is the best way to stay up-to-date with the Kotlin

StateFlow

release developments? I see there was a merge #1974 into the develop branch for StateFlow recently. After the develop branch is merged into master, does that mean StateFlow may be available in the next alpha/beta release?

Hi all. How do I pass the operator "!!" for all hashmap "keys" I need to do something linke this: hasOne = HashMap<String?, String> hashTwo = HashMap<String, String> hashTwo = hashOne

Perhaps

hashTwo = hashOne.map { (k, v ) -> k!! to v}