I'm trying to run JUnit tests with latest IDEA & updates and get

Error:Kotlin: [Internal Error] java.lang.IllegalStateException: Backend Internal error: Exception during file facade code generation

what to do? Other similar module works fine so I'm not sure what is wrong with this specific module which worked fine not so long ago

Can anyone please tell me a free api so that I can collect the covid-19 information and plot it in a map, there location.

i was trying to make kotlin covid console app from rapid api and they give me this code

val client = OkHttpClient()
val request = Request.Builder()
        .url("<https://covid-193.p.rapidapi.com/countries>").get()
        .addHeader("x-rapidapi-host", "<http://covid-193.p.rapidapi.com|covid-193.p.rapidapi.com>")
        .addHeader("x-rapidapi-key", "e9a2bc7b8amshcb0d6ea32047c46p129305jsnf42297251e7d")
        .build()
val response = client.newCall(request).execute()

then i run this code and give me this

Response{protocol=http/1.1, code=200, message=OK, url=<https://covid-193.p.rapidapi.com/countries>}

but all i want was to show me the countries and affected person number i download retrofit and gson but it look little bit harder how do i use it

I got a problem with a Kotlin library with Gradle — building takes a pretty long time; e.g. “Starting Gradle Daemon...” message appeared after 2,5 minutes and starting took 50 seconds. I remember it used to be a lot faster a few days ago and I got no idea why. The full compilation took 4 minutes and 56 seconds, but I remember once Gradle didn't start even after 10 minutes. Also, there's some weird thing in the logs:

> Task :compileKotlinMetadata
Could not connect to Kotlin compile daemon
Could not connect to kotlin daemon. Using fallback strategy.

I have no idea why this happens

Hello. I'm not able to reference a method of the companion object of a sealed class as

MySealedClass::method

. I have to write explicitly

MySealedClass.Companion::method

. Is this normal?

Is there a way to do a when directly on bytes? or do I always have to convert to Int?

Is it better to use require, assert and check functions or to just throw exceptions/errors myself?

I'm trying to understand how to add a JVM module to my android app project. I have a multi module project with a main app module and some kotlin library modules. - app - library1 - library2 Now I want to create a JVM desktop client reusing library1 and library 2. What can I do? I'm going crazy because I have a very superficial knowledge of how Gradle works

given

data class Person(val name: String?, val age: Int?)

is there any way to have

inline val Person.isValid get() = name != null && age != null

allow for smart-casting when accessing `name`/`age`?

I have a ByteBuffer reading a binary file with values as UInt32 . How do I read that in kotlin?

Hi, is there anything in Kotlin, which will allow me to alias Long, but in a way that it is not implicitly converted, so I never mix Long and my own type?

A collections question: Say I have a list of Pairs, where first is a description, and second is a userid. How do I easily sort the list in the following order: a) all entries where second = "SYSTEM" ordered by description b) all entries where second = a particular value (e.g. the logged in user) c) all the remaining entries (second not SYSTEM or the logged in user) I don't think I can use a straight comparator as one of the values (the user) used for sorting is variable

What is the difference between a DSL and Util and API?

Quick style question... I'm doing a code review for a friend. For a const value, why might I prefer a top-level property vs. putting that same property inside a named object? I think the latter seems stylistically better in terms of code management, but I want to hear what others think.

How to access data in the resources folder using Kotlin? Can I put any files I want to have access to in here or does it have some specific purpose? (I prefer if it's a common function, so I could do it on both JVM and Native)

I am getting a build error message that I don’t understand:

e: /Users/espertus/src/firefox-voice/android-app/app/src/main/java/mozilla/voice/assistant/intents/communication/ui/contact/ContactCursorAdapter.kt: (49, 30): Overload resolution ambiguity: 
public final val itemView: View defined in mozilla.voice.assistant.intents.communication.ui.contact.MyAdapter.MyViewHolder
public final val itemView: View defined in mozilla.voice.assistant.intents.communication.ui.contact.MyAdapter.MyViewHolder

Lines 2 and 3 of the error are identical, so I don’t see the ambiguity. Here is the relevant code:

class MyAdapter(
    private val cursor: Cursor
) : RecyclerView.Adapter<MyAdapter.MyViewHolder>() {
    class MyViewHolder(val itemView: View) : RecyclerView.ViewHolder(itemView) {
        private val ivContactPhoto: ImageView

        init {
            ivContactPhoto = itemView.findViewById(R.id.ivContactPhoto) as ImageView
        }
    }

Silly question, but I believe, basic discipline like that adds up to cleaner code… I have data class that should be called

List

. How would you name that class?

is there a fancy way to replace multiple consecutive whitespaces with single whitespaces ? or do i just repeatedly do

.replace("  ", " ")

until the string doesnt change?

Should line numbers in exception backtraces correspond to actual linenumbers in Kotlin files? I ask because I'm getting a backtrace that doesn't seem to.

What might keep a Kotlin executable from exiting after main() has finished?

Performance wise, what would be better? A list with function to fetch for a certain ID

val listOfItems: List<Item> = listOf<Item>
fun getItemWithId(id: String): Item {
  return listOfItems.filter { it.id == id }.first()
}

A map of Item per String

val mapOfItems: Map<String,Item>

Or any other solution I didn’t think of? Thanks 🙂

Hi guys, I have a question which is driving me up the walls, how can I get yesterday EOD in a given time zone regardless of where my code is running (ie. JVM time). For example If I have a ZonedDateTime

May 1 2020 5:35:00 PM PST

I want to programatically get

April 30 2020 11:59:59 PM PST

I tried

val currentTimeInTimeZone = ZonedDateTime.now(ZoneId.of(someTimeZone))

val yesterday = ZonedDateTime.of(
            LocalDate.now().minusDays(1).atTime(LocalTime.MAX).truncatedTo(ChronoUnit.SECONDS),
            ZoneId.of(someTimeZone)
        )

But it seems to work on my machine and when I push the code to production it does not return the correct value, any ideas / help would be appreciated

Hi guys, is there a way to have a secondary constructor with own (more specific) generic type ?

Is there a way to use

T

here to not having to pass

clazz

? With reified parameter or something?

fun <T> getObject(key: PreferencesKey, clazz: Class<T>): T? =
    getString(key)?.let {
        gson.fromJson(it, clazz)
    }

is there a more functional version of this typical "while loop with early exit"?

fun foo(start: Foo): Result<List<MyRes>> {
    val list: MutableList<MyRes> = mutableListOf()
    var bar = start
    while (bar < condition) {
        when (val result = retrieveSomething(bar)) {
            is Success -> list.addAll(result.success)
            is Failure -> return Failure(Throwable("Error: ${result.error}"))
        }
        bar = bar.next()
    }
    return Success(list)
}

What can I do with inline classes for Java interop? Currently I have methods returning useless

Object

or

Object[]

, and extensions with hyphen and hash, absolutely unusable from Java.

Hey! I was wondering if anyone knows about a Kotlin coroutine compatible Apache Cassandra wrapper, as I'd like to use Cassandra in my project. Thanks in advance 🙂

IntelliJ is giving me this warning. And I don't fully understand how to fix this. Could someone explain what I'm doing wrong by calling

.get

here?