Please strart using threads 🙏

Why isn't this a valid contract? It says "Only references to parameters are allowed in a contract description". What does that mean?

hey guys, what is the kotlin equivalent of java's

private float[][] labelProbArray = new float[1][256*256]

?

to put in context, I am working with opencv and tensorflow lite and coverting to / from one another is driving me mad

How can I call the super method for this in an implementation?

I am creating a Kotlin Community within my company. What are good rewards to give away to coworkers who start using Kotlin in their projects, or are doing good within the community? Suggestions would be nice 🙂

Do you guys know if there's any particular reason for

Char.isDigit

to not have it's opposite

Char.isNotDigit

?

hi tristan bergh here. I'm a data scientist looking to use kotlin for data science

We can refer to a method

foo()

of class

Bar

Bar#foo()

. Is it appropriate to reference property

baz

of

Bar

as

Bar#baz

?

is this condensable?

if (expansion.length != 0)
    if (expansion.last().equals(' ')) return expansion.dropLast(1).toString()
return expansion.toString()

I'm finding myself getting frustrated with the fact that Kotlins optionals aren't actually

Optional

objects. Am I missing something here?

sounds like you're missing a heap allocation and pointer indirection

is https://github.com/xenomachina/kotlin-argparser a good argument parsing library or are there better ones?

i have a sealed class with about 10 subclasses (and growing). now i need to map them to a frontend model. so i end up with a huge

when

statement which is more or less unreadibl. so again i end up with a visitor for this class. how do you handle this situation?

are there any kotlin libraries for creating Command Line Shells from, as i cant find any online, just stuff about kotlin compiler and the kotlin REPL

Hi guys! Is there a way, to include annotation processed files into zip? I have a task:

task buildZip(type: Zip) {
    from compileKotlin
    from processResources
    into("lib") {
        from configurations.compileClasspath
    }
}

But this include only the classes I created, not classes created by annotation processing. The build process create the classes made by annotation processing under

tmp/kapt3/classes/main

. Do you know a way to include these files as well?

But the problem is we need to support 23 (which is a low version)

After a list filter, I have to cast it to the filtered type, like

list.filter { it is A }.forEachIndexed { index, item -> (item as A)

Is there any way to smartcast it?

Does anyone know whether this is possible using reflection only?

(person::class.companionObjectInstance as PersonDTO.Companion)

(person is an instance of PersonDTO)

Thanks guys for help regarding the timezone issues. We ended up with Joda because it supports our lowest version (23). Great help! 👏

also can you conceive of a possibility where brackets could and should be omitted? i'm thinking things like 1 line lambda functions, e.g.

list.any it.hasFoo

I don't want the constructor of a data class to be accessible outside a file. Is this a good way to do it? (also what you think of code...)

i tend to prefer the following when working with non-traditional class constructors:

data class Foo {
    companion object {
        operator fun invoke(): Foo {
        
        }
    }
}

Is it possible to use property delegates with the

by

keyword on extension properties, so that I can pass

this

through to the delegate?

Anyone regex experts know how to include foreign chars in this expression?

"[^\\p{Alnum}]".toRegex().find("s.trim μεγιουνικουντ n/o/n a.lph.a n.um\"")

Works in Java with:

p = Pattern.compile("[^\\p{Alnum}]", Pattern.UNICODE_CHARACTER_CLASS);

however do not see an equivalent in Kotlin

Hey, I have a weird one. I have a project that is currently building fine on a colleagues windows pc, it also builds fine on our TeamCity agent. However, on my pc Windows 1809, I get the following exception (will post below). I've tried

mvn package

on wsl (ubuntu 1804) using the default jdk (10) as well as openjdk11 both give the same error. Same error when I try and run from intellij (right click green arrow -> run ). Any ideas 😕

Hey guys, a doubt about

inline class

what happens if I have an inline class as parameter of another inline class?

inline class Bar(val number: Int)
inline class Foo(val bar: Bar)

Foo(Bar(1)) == 1?

R

represents a

kotlin.function

right? thus

fun a(R) {
    R.invoke()
}

will take a function accepting 0 parameters, then execute that function right?