Hi! Do you have an alternative for

substringAfter("X")

where X is a regex? so

substringAfter(regex)

Aren't CLion, GoLand not open source ?

Cannot resolve external dependency org.jetbrains.kotlin:kotlin-gradle-plugin:1.3.31 because no repositories are defined.
Required by:
    project :

allprojects {
    repositories {
        mavenCentral()
        jcenter()
    }
}

plugins {
    kotlin("jvm") version "1.3.31"
}

^this is my build.gradle.tks in root folder, what is wrong?

Might be a decompiler bug. Can you show the real bytecode here?

is there a function to print out non null array of int in Kotlin?

[1,2,null]

will print

[1,2]

Are you on the JVM? You can use

Objects.hashCode(Object...)

which will have an intrinsic in Java 13 (provided it ships)

@hhariri could I DM you ?

Language design question: What is the reason for

const

keyword existing? Why can't compiler automatically treat all vals that are assigned to constant value (such as string literal or number literal) as

const

? Is there a situation where using

const

is not preferred?

is there an annotation we can use to mark debug-statements or something, so i get a warning during compile time if there are debug statements in my code left?

Is there some annotation magic I can sprinkle on a val property to signal to the compiler that it’s guaranteed to be immutable (as apposed to only read only). Use case: cross module nullability smart casts

If the javac compiler is in the JDK, where is the kotlinc compiler?

Do non-Android Kotlin programs need a JRE to run?

I’m interested in any discussions/guideliness/efforts around how to write clean and expressive Kotlin. I realise that there’s https://kotlinlang.org/docs/reference/coding-conventions.html but I’m looking more at how we can use a language like Kotlin to make code more readable and make intentions clear in a concise way. Not just syntax and capitalization, but more about what shape your API should have and how you can make it hard to use incorrectly (using static types and using clear naming). I realise that these things aren’t really language specific, but I think it’s fair to say that without putting explicit thought into this, it’s easy to bring over baggage from previous experience (ie. Kotlin that looks like Java). I don’t want to bring up the s-word here (Swift) but I do see that the Swift API Guidelines (https://swift.org/documentation/api-design-guidelines) have been at least partially responsible for that community’s efforts in how to make code clear at the point of use, and to take advantage of the features that language provides (algebraic data types, internal/external parameter names etc) as well as a structured approach to thinking about API design. I’ve been reading a lot about Kotlin from various sources and our team is using it day to day. What I’m looking for is the place that discussions take place, so that my team and I can learn from and participate in them, and also whether there are any community resources/guidelines around how to best use Kotlin in this way.

Why does not IDEA allow (gives warnings) formatting builder chains like this?

Is there a way for a class constructor to return an optional type of itself? I would like the success of the constructor/init to be dependent on whether a network or db call succeeds or not. How would you otherwise handle this? With a factory pattern? Try/catch?

Hello! I am using Ktor framework to build a web app and I am playing around with the built-in jackson content negotiation, I have data classes that I must respond back to the client side using call.respond(status = HttpStatusCode.OK) {return@respond patientList} where patientList is a list<JSONPatient> and JSONPatient is a data class that has nested data classes but it is all primitive types.I keep getting this error message and i can't figure out why. ERROR Application - 307:reportUnresolvedClass - This class is an internal synthetic class generated by the Kotlin compiler, such as an anonymous class for a lambda, a SAM wrapper, a callable reference, etc. It's not a Kotlin class or interface, so the reflection library has no idea what declarations does it have. Please use Java reflection to inspect this class: class com.wallscope.casebook.api.routes.patients.PatientsKt$patients$1$1$2

Is there an equivalent in kotlin to Groovy's

StringGroovyMethods#getAt(Matcher matcher, int idx)

method?

Hi, i'm using Kotlin 1.3.31 and just started to check out vaadin for some possible usecases. Vaadin is written in Java and uses Streams instead of Kotlin-Sequences, of course. Now, Docs say, I should use

Sequence<T>.asStream()

to make s Stream out of an Sequence, but https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.streams/kotlin.sequences.-sequence/as-stream.html does not seem to be in the Std-Lib anymore!? (Target is JRE 8)

Is there a way to use IntelliJ’s built-in profiler to work with Kotlin? It’s greyed out for me.

I have a list

1.0, 2.0, 0.0, 1.0, 2.0,0.0, 2.0, 2.0

, I want 3 lists

1.0, 2.0

,

0.0, 1.0, 2.0

,

0.0, 2.0, 2.0

where

0.0

is a sort of delimiter (so if I had more of those, it would be in the list to the right. Is there an obvious operation to make this happen?

Hey, question regarding tornadofx. Im creating a view around 100 times and the view is loaded through fxml so its quite slow. I read somewhere that reusing the FXMLLoader can improve performance and was wondering if tornadofx already had some sort of support for that

Are people from the “Kotlin/Everywhere” team in here?

I just don't understand the difference or why one of them fails.

Hey guys, I'm trying to create a nice structure of states of data I'm getting from the server and I don't know how not to repeat all the constructor parameter(s) for each case? Here's an example where I have to add the parameter

value: Value

to the constructor of each subclass. Any idea how to make this nicer? Thanks!

sealed class BaseStatus(
    open val value: Value?
)

data class LoadingStatus(
    override val value: Value?
) : BaseStatus(value)

data class DoneStatus(
    override val value: Value
) : BaseStatus(value)

data class ErrorStatus(
    val error: Throwable,
    override val value: Value?,
    var consumed: Boolean = false
) : BaseStatus(value)

if you want to pass the data into the constructor, you're going to need to define it in each constructor

You can make

value

abstract field instead of constructor property, it's more flexible and less typing

Does anyone have experience configuring proguard to play nice with jackson-module-kotlin? I think I need a way to -keepattributes conditionally (currently I have a

@KeepMembers

annotation) Ideally I can keep the kotlin metadata in those classes, or keep the local variable table for constructors so that it will work with Java 8 parameter names module.

Is there a chance for a tutorial from the community to be integrated on the Tutorials section of Kotlin's website? Are there any rules regarding what is accepted or not, or a process for it?

Isn't it exotic that this code compiles without any issue on Kotlin? 🧐