It won't get interrupted after 100 millis

cancelation is cooperative so you need to check isActive

I know this is a ridiculous example, but I think that this might happen in the library I'm developing, and I wouldn't want it to hang

So I'd have to check

isActive

inside the

while

loop, and break if it's not

Correct?

Replace true with

isActive

as while expression

Unfortunaly that's not possible in my use case. This is just an example

is it possible to add an extention function to a Java class ?

Greetings, #newhere . Hobby Kotlin developer (stuck at a work-place still mostly using Java, trying to enducate and inspire people to look beyond their keyboard :-P) and happy to join the Kotlin community!

Quick google search is failing me so: how does JavaFX render fonts in the UI, for example on Linux? Does it use platform libs, FreeType or something else? (complete Java/JVM beginner here...)

ah, just as I typed this I found that OpenJDK switched to FreeType some years ago... ah well 🙂

https://twitter.com/kotlin/status/1265213666259087361 Define one function with default values for arguments, instead of defining several overloaded functions. #KotlinTips Twitter

Hey! Is there any built in method similar to .associateBy on arrays, but instead of associating the last value related to the thing you're associating by, to be able to pass a specific comparator and only replace it if it fulfils the condition? So right now, if we were to associate [{a:1, b:2}, {a:1, b:3}] basing ourselves on the value of a, the final value would be of the map would be {1: {a: 1, b:3}}, but maybe I would like to compare b and only replace if b < new b. Hope I made myself clear! Thanks for any help!

can we have something to like this to pass data to c function ?

transfer.write_function(|new_data| {
    data.extend_from_slice(new_data);
    Ok(new_data.len())
})

It's really annoying to pass data by making StaticRef and get from staticCFunction and convert to kotlin type.

Hey Kotlin lovers…join us for a virtual code lab tomorrow by David Greenhalgh from Big Nerd Ranch on Channels and Flows. This was one of the most popular code labs at Kotlinconf 2019. If you missed it, here is your chance to register for free at: https://www.online.droidcon.com/advanced-kotlin-2

No, but I'm curious what the use case is.

being able to restrict interfaces to data classes only would've helped... in this case

but I'm only few thousand of lines of code into Kotlin, so who knows 🙂

is there any way of accessing the

this

object from a delegated extension property? i'm trying to do something like this:

val Project.myProp by MyDelegate(this)

where

this

should be the

Project

instance that

myProp

was accessed through, but i'm getting the error that

'this' is not defined in this context

if it matters, i'm trying to write an extension property for gradle edit: sorry, i'm dumb. i forgot that delegates literally get the receiver as the first argument to

getValue

. disregard this.

does anybody have an example with jmh on kotlin code with gradle (without using the jmh plugin)?

Hey guys, I have run into a weird situation here and I do not know whether this is some kind of bug or I am just dumb. (which happens from time to time ^^) This function is a minimized example of what I encountered:

// kotlin 1.3.72
fun foo(one: Int, two: String) {
    val list = listOf(one, two)
    println(list)
}

I selected the

listOf(one, two)

part and tried to perform the "extract function" action on it, assuming that this would result in a function like

fun xxx(one: Int, two: String): List<Any> = ...

But what I actually got was an error popup saying:

Cannot extract method since following types are not denotable in the target scope:

{Comparable<{Int & String}> & java.io.Serializable}

This type is kind of understandable: Int and String are both comparable to themselves and are also serializable. But I did not understand, why this would stop me from extracting a function with type

List<Any>

. Then I tried the "Specify type explicitly" action and the type it suggested was not

List<Any>

, but

List<Comparable<Any>>

. With that type however, the code would not compile anymore, giving three errors:

Type mismatch. Required: Comparable<Any> Found: Int

Type mismatch. Required: List<Comparable<Any>> Found: List<{Comparable{Int & String}> & java.io.Serializable}>

Type mismatch. Required: Comparable<Any> Found: String

I am still having a hard time completely wrapping my head around variance, but I think that this is because it is

List<out T>

, but

Comparable<in T>

with Int and String both having the same type as their comparable T. Now here is my question(s): Is this expected behavior, or should the compiler (or the Kotlin plugin?) refrain from inferring a type that has this kind of contradiction? Is this even feasible to check? I mean this only occurs because Comparable is usually used with T being the own type, like

Int : Comparable<Int>

... Edit: As a little bonus, I just saw a thing which probably really is a bug: There are 3 quickfixes for the threefold error above: • Change type of 'list' to 'Int' • Change type of 'list' to 'List<Any>' • Change type of 'list' to 'String' Yes, the second one is what is needed here, but the other ones do not make sense... Why does it suggest to make it

val list: Int = listOf(one, two)

? 😅

Hey everyone! We got a live stream meetup going on now, topics are Kotlin Flow & Kodein DI. Check it out at !

https://twitter.com/kotlin/status/1266029106250027013 Use 'partition' to divide a collection into two groups. Use 'groupBy' to divide it into more than two groups. #KotlinTips https://t.co/eOJqUf0A8u Twitter

👋 I’m here! What’d I miss?

Any idea how to accomplish what I'm trying to do here

You could write

List<T>.firstHalf(): List<T>

and

List<T>.secondHalf(): List<T>

extension methods that make use of

subList()

, be sure to add unit tests to ensure that the middle element is included in exactly one of them.

Or I could stop being lazy and just use an old-fashioned for loop...

forEachIndexed might help

Hi! Is anyone available to talk about how to store a list of coroutine jobs to start at a later time?