kotlinlang #getting-started

How does IDEA support this? If I leave root directory out, where do I specify "base package" for new classes? Without something like this am I supposed to fix package name for newly created class every time?

Hullaballoonatic

01/18/2019, 9:40 PM

is there a way to accomplish this without finding some class from which both inherit?

karelpeeters

01/18/2019, 10:38 PM

Not that `final`s aren't even runtime constant, they can still be changed by reflection.

Hullaballoonatic

01/18/2019, 10:59 PM

why doesn't Java just make use of

const

? they've had it reserved and unused for how long now?

🤷 2

Hullaballoonatic

01/19/2019, 11:42 PM

can i control how various classes are cast to one of mine with

as

and

is

? As in, I have made a custom class, and is somewhere else a cast some class to it with

as

, it would follow code i wrote somewhere else to do so. Does that make sense?

ursus

01/20/2019, 4:17 AM

for (lookupTask in lookupTasks) {
    val serverUrl = lookupTask.execute(domain, username, password)
    if (serverUrl != null) {
        return serverUrl
    }
}
return null

popescustefanradu

01/20/2019, 1:05 PM

hey, I have a repository that returns a nullable object, how do i make a nice code that returns a field of that object if the object exists and otherwise does some other business?

bjonnh

01/21/2019, 3:51 AM

I have a function like that: fun ConfigurationManager.getXConfig(): List<Resource> {} I would like to be able to do: fun ConfigurationManager.getXConfig(): XConfigs {} so I can write extension functions such as Xconfigs.names (that would be a simple fun XConfigs.names: get() = this.map { it: Resource -> it.name }

Hullaballoonatic

01/21/2019, 5:34 AM

i guess i should know this from java, but i always just make sure by programming around the question, and figured I'd finally ask:

val data = aDataClassOrSomething(foo = ArrayList<Stuff>())
val bar = data.foo

bar

passed by reference or just value? If I alter

bar

does it alter

data.foo

Azhar

01/22/2019, 11:02 AM

#getting-started how to data class empty secondary constructor in kotlin

CarlosBlanco

01/22/2019, 3:03 PM

how can i write code like @hudsonb? insade of square

febs

01/22/2019, 9:07 PM

Getting the hang of Collections. How do a List of Pairs and a Map differ in practical use, and when should I chose one over the other? I've noticed that I can create both pairs and maps with the "to" infix function: val listaOfPairs : List<Pair<String, Int>> = listOf( "ciao" to 2) val map: Map <String, Int> = mapOf( "ciao" to 2 ) Thanks 🤗 🤗

Ruckus

01/22/2019, 9:10 PM

A list of pairs is just a list of paired values. A map is a mapping from keys to values, so you can for example lookup values by keys. (Sorry to use the names in the descriptions, but in my defense, they are aptly named)

val people = mapOf("a" to Person("Fred"), "b" to Person("George"))
val fred = people["a"]

ivano

01/24/2019, 10:06 AM

Communicate_between_two_fragments_via_interface.txt

Smorg

01/24/2019, 1:31 PM

Hi guys, I have a sealed class S in another class V with subtypes of the sealed class defined in it. How can I access methods of V in the subtypes?

class V {
    fun doSomething() {
        ...
    }

   sealed class S {
         object S1: S() {
             // how can I possibly do below:
             init {
                  doSomething()
             }
         }
   }
}

I know for a regular class, I just need to declare it as inner and call the regular outer class methods from it

febs

01/25/2019, 12:36 PM

I have this map: private val listOfFeeds : Map<String, String> If I try to access an element with val s = listOfFeeds[key] The return type of "s" is String? And not String. I guess that's because the compiler can't assume it'll get a value for that key. Right? And if so, how can I work around the problem? Is !! the only solution here?

pugnator

01/26/2019, 8:15 AM

Hello! I have Webview and I need for it doubleClick for show and hidden menu

:stackoverflow: 6

:android: 2

jurajsolarml

01/27/2019, 4:20 PM

Hello,Please can you help me ? I am beginner. I'm not sure how to do it. /Kotlin/ Thanks

aarjav

01/28/2019, 12:09 AM

How to go from

Function<T,R>?

((T) -> R)?

I used an extension property

val Function<T,R>.lambda: ((T) -> R) get() = this::apply

and use it like

func?.lambda

voddan

01/28/2019, 2:49 PM

Hi! I've got a very weird problem with Gradle. Any help or tips will be greatly appreciated. https://stackoverflow.com/questions/54404400/test-fail-with-noclassdeffounderror-kotlin-autocloseablekt

ivano

01/29/2019, 10:58 AM

why?

Jay

01/29/2019, 1:53 PM

I keep trying to do

return <whatever>

from lambdas - I know I just need to remove the

return

, but can anyone explain the error message to me? From the expected type it looks as if the

return

from within the lambda is capable of terminating the enclosing function call - how is this possible? Would this pop the stack from the lambda, the

partition

call, and the enclosing function - like a

throw

Kevin

01/30/2019, 2:00 AM

Hi all! I’m trying to make an app that looks at my messages on my macbook. MacOS Mojave blocks access to the

~/Library/Messages

folder by default. I have 2 questions: 1. How can I request permission to access this folder in Kotlin? 2. Can I give IntelliJ and all child processes permission to access this folder? I gave IntelliJ full disk access, but that doesn’t seem to give permissions to my app when I click the

run

button. Right now I have to build the whole app and manually add that build to my security settings each time.

Anton Lakotka [JB]

01/30/2019, 11:44 AM

Hello, Is there any standard function with similar behaviour (ifNull extension function)? Or maybe there are some nice idiomatic ways to do that?

-.kt

otakusenpai

01/30/2019, 1:03 PM

Hello, I'm trying to make a FEN parser, and in that I have to parse something like this:- "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1" What I do now is that I just split that string using split(' ') into a List<String> and on the first string of the list, any value can have 1,especially on the rnbqkbnr/ppp... and their uppercase counterparts, and when its 1 I have to just ignore it(I'm using a when statement). My question is how do I ignore a case in a when statement since break and continue aren't applicable(Yup, I know it's a noobish question).

serebit

01/30/2019, 3:47 PM

Seems fine to me

👍 1

karelpeeters

02/01/2019, 11:15 AM

.mapNotNull { it.foo }.filter { barFunction(it) }

👍 2

Bernhard

02/04/2019, 12:50 PM

it’s kinda like async, but the api that I use is not async

Bernhard

02/04/2019, 1:04 PM

am I asking in the right channel?

👍 1

Bernhard

02/04/2019, 1:37 PM

runBlocking should just block until everything is finished I think