so @JvmField kinda generates metadata twice, once for kotlin and once for java?

What is Kotlin's stance on nested destructuring, similar to Scala's feature, like so:

fun main(args: Array<String>) {
    val p1 = Pair(1, 2);
    val p2 = Pair(3, 4);
    val p3 = Pair(p1, p2);
    val (simple, destructuring) = p1
    //val ((nested, _), (destructuring, _)) = p3;
}

Hope you get back to me, thanks

Does anyone have a list of Kotlin repo that requires contribution/PR?

What do the good people here prefer? https://twitter.com/pablisc0/status/1091715054070874113 😁

Why in this example

item1

is highlighted with "Cannot infer a type for this parameter. Please specify it explicitly"? Is there a way to modify

someWrapper()

to remove this error?

Why should you avoid @JvmStatic for a logger?

does anyone know of a kotlin or java library that can take ansi colored text (from running

git diff

process) and turn it into colored html output?

I'm trying to reflectively access a property value of a data class like this:

it::class.memberProperties.filter { prop -> prop.name == propertyName }.first().get(it)

but getting the following compiler error:

Out-projected type 'KProperty1<out DataClass!, Any?>' prohibits the use of 'public abstract fun get(receiver: T): R defined in kotlin.reflect.KProperty1'

using

it::class.java.getMethod("get${propertyName.capitalize()}").invoke(it)

appears to work, but it seems like there should be a way to do this through KClass directly (and avoid having to generate the getter method name)?

i get this error when trying to switch from hamcrest to assertj:

Error:Kotlin: [Internal Error] java.lang.IllegalStateException: Backend Internal error: Exception during code generation
Cause: Back-end (JVM) Internal error: wrong code generated
org.jetbrains.kotlin.codegen.CompilationException Back-end (JVM) Internal error: Couldn't transform method node:

anyone know what's up?

Does assertJ have overloads for primitive types? Hamcrest matchers are generics, so primitive booleans will be boxed into Boolean wrappers. If assertJ does not box the actual values, then you’ll need to change the instance-of check

Hi there. I'm using reflection in order to get a methods parameter list. Unfortunately kotlin and java return different values for the same signature. a) is that on purpose b) is there a way to get the same results https://gist.github.com/dfreudenberger/d9f7e6aa7031aa106a14692223c3d1b8

How could then pass the param through

child::childNodeBlock

?

Static imports in Java are not “bad”. Static mutable state can cause problems. Kotlin helps one avoid mutable state, with an emphasis on immutable data and pure functions.

Static imports can be bad for code readability. For example, I've had a misfortune to deal with a code base with these collection "literals" all over it:

of(a, b, c)

, where

of

was a static import of

ImmutableList.of

,

ImmutableSet.of

etc. You always had to look at the imports to understand the code. Arguably that's a naming/misunderstood intention problem though, Google Collections' team obviously intended

*.of

not to be statically imported.

so basically !!

Why is the following not allowed?

sealed class Outer {
  data class Inner1(val value: Int) : Outer()
  data class Inner2(val value: String) : Outer()
}

typealias OuterAlias = Outer

fun main() {
   val i = OuterAlias.Inner1(3) // gives an error "Unresoved reference: Inner1"
}

If typealias is just an alias the above should be possible I guess.

What's the difference between

find { }

and

firstOrNull { }

on

Iterable<T>

in the stdlib?

does runBlocking create a new coroutine scope so that your jobs inside of it won’t leak on exceptions

I have a Kotlin based question, which I've posted to stackoverflow. Help is much appreciated: https://stackoverflow.com/questions/54520330/abstract-factory-and-inheritance-kotlin

If I have specific questions about a github issue and some further clarification on what was written where would I ask such questions?

has anyone else seen this internal compiler error since upgrading to 1.3.20? https://youtrack.jetbrains.com/issue/IDEA-206642

Is it possible to make a class

open

to its own module only but not to "the public"?

Why does a `StringBuilder`have a method

append

but no method

prepend

, that does not make much sense to me. Anyone knows why there's none?

What would be the functional equivalent of this? I frown upon these MutableList things (the old java way) nowadays and always

map

stuff instead but I can’t figure out how to do this. I’m essentially looping over a sequence and I want to place things into three different lists, like

partition

but for three output collections instead of two. Is there some general function or a combination that can do this?

val success: MutableList<String> = ArrayList()
val failed: MutableList<String> = ArrayList()
val ignored: MutableList<String> = ArrayList()

for (string in strings) {
    val result = doStuff(string)
    when {
        result != null -> success.add(ingredient)
        other condition -> ignored.add(string)
        else -> failed.add(string)
    }
}

is it weird to have setters in Immutable classes (which return new instances of "class")

Hello, any kmongo experts here? How to insert data class object into mongodb preserving class properties naming?

data class Lol {val Kek: String)

Currently,

Kek

will be mapped to

kek

, but I want to preserve it as

Kek

What do you use or prefer, KtLint vs Detekt? Why?

not sure where to post this, but when you use

runBlocking {}

in junit tests and you have

assertEquals()

as the last call (or any kotlin test assertion) it doesn't work, because tests should have

Unit

return type, but since

asserEquals

returns stuff, junit doesn't pick up the test. What can I do? I can just put

Unit

in the end of the call, but it does't look good

Does anybody know, for what reason this one https://pl.kotl.in/Sk2RqPdEN does not throw compile-time error?