Is there a Kotlin performance profiler for Windows?

is setter for a field called for the initial value?

I've heard a lot about KEEP87 recently. After reading that article : https://quickbirdstudios.com/blog/keep-87-typeclasses-kotlin/ I have now a basic understanding the feature request, but still have trouble finding how I could use it in my projects. Does anyone have sample use cases, apart from the

equals

problem described in the article and functionnal programming (that I don't really understand at the moment 😅) ?

I didn’t think ?.let returned a value?

Hello everyone, Hexagon 1.0 got released!!! It is a toolkit for developing web services in Kotlin heavily inspired in Javalin and Spark. I would like to gather feedback from the community, so if you could take a look at it, share your thoughts, spread the word among other Kotlin developers and/or give it a star 😉 It would be much appreciated 🙂 https://hexagonkt.com https://github.com/hexagonkt

Does anyone have a favorite tutorial on getting up and running with Kotlin, preferably with examples that even publish at least one app? I'm compiling a list and so far have found the following: https://www.udacity.com/course/developing-android-apps-with-kotlin--ud9012 https://www.udacity.com/course/kotlin-for-android-developers--ud888 https://www.udacity.com/course/kotlin-bootcamp-for-programmers--ud9011 https://www.udemy.com/kotlin-course/ https://www.udemy.com/the-complete-kotlin-developer-course/ https://www.udemy.com/android-app-development-using-kotlin/

What is the current state of JMOD support in Kotlin? Have encountered a roadblock in a project where JavaFX 8 is used that would likely be resolved by using JavaFX 9 and above, however JavaFX starting from version 9 uses JMOD, which Kotlin doesn't support.

Does anyone know how to auto import an overloaded array access operator in intellij? Example:

// java
package com.example.legacy
public class Thing {
    public String get(String s) {
        return s;
    }
}

// kotlin
package com.example.extensions
import com.example.legacy.Thing
operator fun Thing.get(index: Int) = index

// kotlin
package com.example.business.logic
import com.example.legacy.Thing
fun doStuff(thing: Thing) {
    val x = thing[1] // compiler says "String expected, but Int found"
}

At

val x = thing[1]

there is a compile error, because the extension in

com.example.extensions

is not yet imported. But I cannot conveniently import it... When I instead write it as a method call (

val x = thing.get(1)

) it tells me that it can import it and I can just hit Alt+Enter and the import is added. Then I can change it back to the array access syntax. is there a shorter and more convenient way to get this import line added?

https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.jvm.functions/-function-n/invoke.html -> returning 404

What is the best place to start/ask if I would like to start contributing to kotlin? Are there any starter tasks or something besides the documentation?

anyone know why clion is booting overscaled on a 4k display on linux?

⏸️ Does anyone have this icon? 🙂

is there a reason why am I getting:

'@JvmName': is not applicable to this declaration

for an extension function in an interface?

@Shawn Thanks! I meant, I already specify Java version (or so it seems) in` java` block, how can I not define it in

tasks

?

Hello, it is possible do parallel filter via collection stream?

what is a kotliny way to generate a list of elements given a number of elements? e.g. something like

5.times |x| mylist << x

in ruby

what would be the right place to post about kotlinx.html (JVM version) ?

Hi guys. Is there a simple way to do cyclic data classes? If I do it normaly most of the methods will break.

In @hhariri's io19 talk ineqality shows up as ≠. How can I do it? Is it an IDE feature?

Good morning everyone, I'm studying TornadoFX framework and I'd like to know how to add an icon to the GUI. (I have no experience whit JavaFX).

let's say I have a config which has several values with several variables

a,b,c,...,z

Let's say I have a complicated algorithm/function sequence which I want to break up into smaller unit testable functions. Each function takes a subset of config values and some calculated values (by previous parts by other functions)... this can get pretty annoying as each time I pass arguments into a function I have to pass in a ton. It would be nice if Java/Kotlin supported something like in TS where I can have an interface for some JSON and any JSON which had the proper fields and types would be allowed... this would allow for just passing in the entire config as an argument (or if I am unit testing passing in a subset of the config if needed). I am almost certain there is not a good solution to this in Kotlin/Java, but do you think there is one? I guess you could pass in a map as a parameter but this would not be compile-time type safe ... additionally, nested functions in Kotlin could be nice but the issue with them is that they are impossible to unit test. Thoughts?

then I get this error

src/main/kotlin/samples/HelloWorld.kt:7:18: error: unresolved reference: Person
    val person = Person("me")

@gildor could I DM you ?

Is there a way to make smart casting work with sealed classes without having to exhaustively handle every case? For instance I expected this to work since I only have two implementations defined for my sealed class.

is there a hard and fast rule of when to use

sequence

vs when to use

streams

? i know sequence is for processing large collection of data, but is there any reason why can't I use it to process small amount of data?

Is this syntax is correct,

model?.let{ some code} ?: run { code in case model is null}

Using the

!!

operator seems to be a frequent source of issues. Has anyone here ever considered turning

!!

into a compiler-error lint rule?

what? it won’t let me get the class of a generically typed instance? I tried !! in several locations,didn’t seem to fix, suggestions?

Public Disclosure of a fixed JetBrains/Kotlin security vulnerability This writeup is the result of ~ 4 months of research into the software security of the JVM ecosystem's supply chain impacting Gradle, Maven, and SBT users. What I found was quite disturbing. A huge swath of the JVM ecosystem and many of the most popular libraries were all downloading their dependencies over HTTP instead of HTTPS. This also impacted many JetBrains projects including several IntelliJ plugins and the Kotlin Compiler. _Action steps for readers_: Please go check your builds and fix them if they are using

http

instead of

https

! I want to thank @Yaroslav Russkih and the entire JetBrains/Kotlin team for being awesome to work with on this security vulnerability. They jumped on it very quickly and began patching all of their repositories swiftly. I believe we've gotten all of them, but if you spot something contact security@jetbrains.com https://medium.com/@jonathan.leitschuh/want-to-take-over-the-java-ecosystem-all-you-need-is-a-mitm-1fc329d898fb?source=friends_link&sk=3c99970c55a899ad9ef41f126efcde0e