Some ideas how can I solve it

sure, I’ll point folks there next time 👍

Not sure if this is the best place for this but I’m having trouble accessing an

internal

class from a unit test in the same module. Android Studio shows no issues but when I try to compile I just get

Cannot access 'XXX': it is internal in 'YYY'

. This is using Kotlin 1.2.20

I get a "Type mismatch". It is expecting String instead of String? But can't understand why

Does anyone know how I can get Android studio to run the main function or what the problem is?

Is there something builtin to check if a list is sorted?

unless someone has a better idea

Or am i missing something.

@ziggy42 If I get your code correctly,

currentTotal

is always equal to the final

before

, right? so

val list = some.things.map { 
    Something.fromOtherThing(it, currentTotal, currentTotal - it.amount).also {
            currentTotal -= it.amount
    }
}
val currentTotal = list.last().thirdParameter

should work

But you have to return right?

@dh44t as much as I'd like to learn arrow and fp in general I cannot import a library for just this 😕

@igor.wojda When a compiler uses two different types as input to a function or class that is parametric and incudes type arguments the compiler needs to infer the intersection type of the different values provided to determine the type of the receiver. In the link above the compiler is trying to determine the inferred type for

list

using both

handlers

and

ErrorHandler

type information and computing the intersection based on the hierarchy of those two applied types. In the first case

handlers

uses an interface that declares type arguments in contravariant position

in

. The compiler seems to be fine finding the intersection but it's bailing at runtime so the generated bytecode is probably incorrect where it has to do the appropriate cast but this last part is a wild guess.

is there a way to disable inline functions in test code? (for coverage since it doesn’t work)

@avolkmann Don’t see how this could affect the performance if you have no value of that type. The use is a bit suspect though, but this practice has been used with some interesting applications under the name “Phantom Type” in Haskell https://wiki.haskell.org/Phantom_type

Function1<A, Unit>

I believe?

just changes their ugly

return Unit.INSTANCE;

to the slightly less ugly

return null;

The answer is probably "no", but just to be sure: Is there something like Java's

ServiceLoader

for pure Kotlin, i.e. can be used in a multiplatform project?

But May there is a way to avoid creating a class

Can anyone know rxkotlin or rxjava channels in slack ?

Is there an easy way to convert a

Range

to an array? There is no

reduce

function for Ranges, and although this works, it feels a bit awkward:

(0..frames).forEach { i -> duration += animation?.getDuration(i)!! }

maybe

val frameDurationArray = IntArray(frames + 1) { animation?.getDuration(it)!! }
val duration = frameDurationArray.sum()

Hi everyone 👋 I’ve just launched a survey on the State of Kotlin. I’d like to learn how developers around the world are adopting Kotlin, as well as when you started using it, and what resources helped you learn it. https://pusher-platform.typeform.com/to/o5r0C7 My hope is that the results will help us convince more people in our teams and companies to get on board the Kotlin 🚂 and get the ball rolling! 💪 Oh, and the best part is that by doing the survey you get a chance to win a trip to the KotlinConf in Amsterdam 🇳🇱 ! (✈️ + 🏨 + 🎟️ ). So if you find this interesting please take part and share with your friends and colleagues! We’ll make sure to send you a copy of the results when the report is out. Feel free to ping me for more info!

@ghosalmartin I once proposed something along those lines: https://discuss.kotlinlang.org/t/extension-types-for-kotlin/1390 . There is a KEEP in progress to add actual type classes to Kotlin (which is in effect what you’re asking): https://github.com/Kotlin/KEEP/pull/87

Is there any benefit to having constants in a companion object instead of just using `private val`s in a singleton? Or even `public val`s for that matter

I know, but still - if I have 3 net connections downloading stuff and stuffing it into one data structure, I can't do much around it... I am still stuck with synchronization BS, or copy problems etc. Ok not your problem anyway 🙂

General question. What is good lightweight messaging queue implementation on Kotlin/Java? Should I just go with ActiveMQ and be done with it, or is there something more lightwheight, more smiple... I don't require exactly JMS standard, but reliability would be higher priority. Including possibility to swing binary data (like .class) through it.

https://github.com/JetBrains/kotlin-netbeans/issues/122#issuecomment-359820520 Does Kotlin not compatible with Java? Why can't develop plugin for Netbeans in Kotlin?

kotlin serialization library which came with 1.2 -> Why it can't serialize plain maps/lists? Or what I miss? I want to have fat map and do serialization of it back and forth... and map type is <String, Any> so Any would be backed by my @Serializable annotation