Is there a way to have a

List

of a few different enums with a common property

val

? I'd need to be able to retreive the list of entries and get the value of that property for each...

When are more Kotlinconf videos going to go up?

Hi @robstoll here is how I would do it.

how do you feel about having different objects for writing and reading database objects? Writing an object will for instance not require an id whereas querying an object will always have one. Otherwise I have to add null checks everywhere.

in 1.3, does the

inline

identifier ensure that the class will be inlined, or is it a hint and there any set of rules to which inline classes do get inlined

What are you trying to do?

How would I unit test an

actor

with a

delay

in it?

Hello, can i define a lambda that accepts a mutable variable as parameter?

Hi guys,

fun foo(s: String = "") = "hello $s"

fun bar(a: String?) {
   foo(a ?: "")
}

In the above code is there a way for us to use the default value for the parameter in case

a

is null, instead of repeating the default value in

bar

? This way, we don’t rely on what the default value of

foo

is within

bar

inline fun <reified T> Config.xAxis(block: T.() -> Unit, axisType: AxisType) {
   xAxis = when (T::class.java) {
       NumericAxis::class.java -> {
         NumericAxis().apply(block)
       }
       else -> throw UnsupportedOperationException("currently unsupported")
   }
}

Why does it not compile? Any thoughts?

Hi guys, quick question : we are currently running Fortify [https://en.wikipedia.org/wiki/Fortify_Software] in our CI to check for potential vulnerability of our Java code. We plan to migrate some components to Kotlin but Fortify does'nt support Kotlin (yet?). Do you know something able to do a security audit on Kotlin code ?

Hi, question about coroutines. I’m a bit confused about kolinx.couroutines vs kotlin.coroutines. What is the difference? docs (https://kotlinlang.org/docs/reference/coroutines-overview.html) are the former. Gradle kotlin-dsl example the later for example

Anyone else having trouble with the #ktor dependency download? My CI can't pass because gradle takes times out before it can download it and the bintray links is very unresponsive.

I might be missing something, but is there any way to binary search in a descending IntArray? All I can see is

IntArray.binarySearch

but that's only for ascending.

Arrays.binarySearch

allows you to specify the comparator but only for the

Array<T>

, not for the

IntArray

. Seems like a dead end.

Looking at the byte code it seems like there is

Array.copy

involved in the following statement:

fun foo(vararg path: String) = Paths.get(*path)

Is there a way to pass an array to

Paths.get

as it is possible in Java in order to circumvent the performance penalty?

there isnt a way to have

inline

within

interface

methods?

only private or final methods can have it

one of the puzzlers from kotlinconf surprised me. why the unary

-

is not part of the number literal?

fun main(args: Array<String>) {
    println(-2018.toString().length)
}

prints -4, because method call has higher priority than unaryMinus. I mean, I understand the reasoning for operators precedence and indeed it makes perfect sense to call the method before making any other operations. But in case of literals it would make much more sense to glue the minus char with the digits. Similarly as the dot between digits is not treated as a method call.

what should

println(4-2018.toString().length)

print in your opinion?

Yeah I was really surprised by it as recently I was playing with some maths and had this

data class Complex(val re: Double, val im: Double)

nice class and a few operators on it and I was so happy that I can do all this

z = z * z + c

thingies, wow Kotlin is so great. Then I was sooooo happy when I figured out I can add

val Double.i get() = Complex(0.0, this)

and simply have

val z = 3.5.i

And then, just after that, I saw the "Puzzlers" talk. And tried

-3.5.i

. Oh boy...

anyone know where the next KotlinConf will be hosted?

anyone using

Spek

for the unit tests in IntelliJ, not sure why I'm not able to run it. I installed the Spek Framework plugin.

Where can I post for an internship in Cape Town, South Africa we are offering?

Hey guys, I've been searching but I can't find a clear answer. Can inline functions be recursive? I understand they can't, but I'd like to be sure

Hi everybody, just would like to ask how stable is the last RC of version 1.3, I'm reaaaaaaaaallllly anxious to use it at production and omg, waiting is getting painful xD, really wanting to use release coroutines and with 1.3 i'll also start to delve into multiplatform projects and try to convince all my colleagues at work to migrate to this awesome language

A heard a lot of mentions at KotlinConf of wanting a Kotlin/GPU back-end but isn't that already possible...ish? Kotlin/Native -> LLVM -> SPIR-V -> Vulkan/OpenCL.

Hi guys, It is nice being part of this channel.

Any tips for http client library? Fuel looks promising at first glance

hello everyone. Is kotlin coroutine suitable for processing big about of pdf parsing?

What is the best way for working with files in kotlin? Do I still need to use FileInputStream and other classes from Java?