Is there some function like

Array.forEach

that passes each element as

this

instead of

it

?

There is no Maven channel so I am asking here. Is there any way to resolve the dependency clash I am describing here? I have never encountered anything similar although I assume this is not strictly Kotlin specific. https://github.com/MarkusAmshove/Kluent/issues/55

what is the 'in' keyword for

well except for the variance

Like can you compare them with

==

operator?

is this CORS code too "clever" ?

val header = ctx.header("Origin") ?: ctx.header("Referer") ?: return
origins.filter { header.startsWith(it) }.firstOrNull()?.let {
    ctx.header("Access-Control-Allow-Origin", it)
}

Just found this on the F# Slack: https://www.slant.co/topics/485/~best-languages-for-learning-functional-programming. Thought it was worth a look. Kotlin is at #12.

recently I saw more and more Maven/Gradle Kotlin projects that have a non-standard Gradle/Maven structure like

<PROJECT_ROOT>/src/my/package

instead of the classically conventional

<PROJECT_ROOT>/src/main/kotlin/my/package

. Basically the

main/kotlin

infix disappeared. Also the resources are on the same level as the

src

folder. Is this the new project structure that Kotlin wants to adopt and become mainstream? Or are those just some odd cases?

@napperley Yes, start a new Thread that runs the loop.

is doing

when (boolean) {
    true -> ...
    false -> ... 
}

considered bad?

I have a java class with:

protected X event;
public Y getEvent()

How do I call them from Kotlin (extending the class)?

@supaham If

n == 1

and

size == 0

that means that

n >= size

and so

toList()

will be returned. Unless you're talking about something else, I don't think there's an issue.

Managed to track down the cause of the problem where readLine() doesn't block and wait for keyboard input like one would expect. If Gradle is used to build a Kotlin project then the problem occurs. Has there been an issue filed about this? Can get readLine() working just fine in an ordinary Kotlin project in IntelliJ, and in the Kotlin REPL. If the IntelliJ Kotlin REPL is used in a open Gradle project, using Kotlin JVM then the same problem occurs.

Maybe because

|=

is also the bitwise or operator and that would be translated as

or

, and they forgot to check for the boolean case.

@supaham There’s no function here https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.collections/index.html that returns

List<T>

or

Iterator<T>

and does what you’d like, so I doubt there is one. Here are two ways I could think of to implement it though:

inline fun <T, R : Comparable<R>> Iterable<T>.allMaxBy(selector: (T) -> R): List<T>? {
    return map(selector).max()?.let { best -> filter { selector(it) == best } }
}

inline fun <T, R : Comparable<R>> Iterable<T>.allMaxBy(selector: (T) -> R): List<T>? {
    return groupBy(selector).run { get(keys.max()) }
}

read https://kotlinlang.org/docs/reference/ranges.html

I like to use an extension computed value of .returningNothing() for situations in which I want to assign another function to a Unit function

seems like a lot of people ask questions/discuss the language in both 🤔

have anyone used org.w3c.dom.Node in Kotlin? I'm getting "Error:(49, 40) Kotlin: Unresolved reference: textContent" in the build and have no idea why

Do you have any particular problems with it?

#language-proposals comes close. This does indeed feel like a bug, maybe you're the first one that wants to add `Short`s ☺️.

no, something like:

suspend fun Db.saveAsync() = async(DbPool) { db.save() }
db.saveAsync().await()

or 

suspend fun Db.saveAsync() = run(DbPool) { db.save() }
db.saveAsync()

This Mockito error has not occurred when using

1.1.3-2

(or earlier versions, for that matter). It seems that the

1.1.4

compiler does something unusual with the bytecode. Notice the warning:

Byte Buddy could not instrument all classes within the mock's type hierarchy

This problem should never occur for javac-compiled classes. This problem has been observed for classes that are:
 - Compiled by older versions of scalac
 - Classes that are part of the Android distribution

hello everyone, just upgraded to 1.1.4, and i’m seeing

ClassFormatError: Illegal field modifiers in class (different interfaces): 0x1018

all over… anyone else seeing this?

Code: I'm doing a saturating

short

arithmetic.

when {
                    a == 0.toShort() || b == 0.toShort() || (a > 0) xor (b > 0) -> a+b
                    x > 0 -> if (Short.MAX_VALUE - a < b) Short.MAX_VALUE else a + b
                    else -> if (Short.MIN_VALUE - a < b) Short.MIN_VALUE else a + b
                }.toShort()

All mathematical operations (

+

,

-

,

*

,

/

,

and

,

or

, etc.) result in

Int

by default or

Long

if one operand is a

Long

.

@ulrikguenther I just filed a bug: https://youtrack.jetbrains.com/issue/KT-19689

Hi gentlemen! What is idiomatic way of doing this in Kotlin? var s : String = (some long expression) if (s.length > 255) s = s.take(252)+"...";