@kartikpatodi what are you trying to do? your second code returns a new instance of

A

and not an Integer

What is the best way to associate by to a list if key is present multiple times

associateBy(keySelector = { it.getAttributeValue(“name”) }, valueTransform = { it.getAttributeValue(“value”) ?: “” })

Hey guys, I added a vector (svg format) to my app through “New”->“Vector Asset” and it was added to the drawable folder in the res folder. I see the icon on the drawable folder as ic_thumbsup.xml, but when setting the srcCompact property of the imageButton however, it is not listed. What should I do?

Is rxkotlin an rxjava replacement for when working with kotlin? Or both need to be added?

Is it a bad thinks to use a lot object instead of classes?

I'm working on a Android-project (mixed java/kotlin) where I will extract parts of the current code to a separate library so that I can re-use it for a CLI-applikation. How do I configure the projects in Android Studio and IntelliJ to share this code/library? Please point me to the correct direction if this is not the forum for this kind of question.

so they’re both

this

, do I just cast

this

to that View when I need to use the view, and use

this

as is when I want to refer to the context?

so if I have a data class that Im going to create a table according to, I dont want to be instantiating it with ID

so that I can set ID on it when I retrieve all objects from DB and I would get the DB-given ID

Hi guys, I'm new to Kotlin and the Java world. I've installed IntelliJ IDEA and am with a Kotlin video tutorial. Should I start with learning/using Maven or Gradle? What is the 'default' / better integrated with IntelliJ

im sorry for my question... i think identical question of 100000 of users 🙂, the best kotlin book?

I understand const does not work for fields

thanks @dalexander I tried a mix of both :

val validConditions = mutableListOf<ConditionalLink>()
        val conditionalNextLink = node.nextLinks.map { it as ConditionalLink }
        validConditions.addAll(
                conditionalNextLink
                        .filter { it.condition.condition.isNotEmpty() && checker.check(it.condition, message.body()) }
        )
        if (validConditions.isEmpty()) {
            validConditions.addAll(
                    conditionalNextLink
                            .filter { it.condition == Condition.ELSE }
            )

        }
        val validConditionsAsResponse = validConditions
                .onEach { eventBus.send(it.eventName, message) }
                .map { it.condition }
        
        message.reply(JsonObject().put("validConditions", validConditionsAsResponse))`

Hi guys! I don't understand what's the main differences between timer function and Timer.schedule? I want to run periodical task. As I understand both approaches are similar.

How to mock a kotlin extension? I tried the mockito way but it doesn’t work

Mockito.`when`(flowNode.getInputParameter(“response”)).thenReturn(“re”)

I don’t know what’s wrong with that:

val regex = Regex("""\bfuck\b""")
        assertTrue(regex matches "ok fuck you")

there is no match

Good day, can you give me some sources on the implementation of retrofit on soap web service? I have this project where i need to POST a soap request

Thanks @dalexander and @karelpeeters -- I'll take a look at Kobalt and if that doesn't help, I may ask in #kontributors (that had been suggested by @cfleming who's another Clojure guy that uses Kotlin).

How to suppress 'unused type parameter' warning? Both

UNUSED_VARIABLE

and

UNUSED_PARAMETER

not worked.

Hi guys, I have 1 mutualized set of data that will be query by multiple thread, the idea is to query this set and return and remove it from the set For example the set can contains ResquestObjects (date,level,subject) I need to query to find the last request with subject = A and immediately remove it in java I would have used synchronized for that is there a better solution? I use Kotlin, RxJava and Vertx

you should probably look at more Kotlin-friendly DI containers (not that Guice/Dagger don't work, but they can be a PITA to use with Kotlin), I know #kodein has something like that

the type signature of the method must be a leaf node on your class hierarchy or dagger will miss things.

this

infix fun ArrayList<*>.resize(newSize: Int) {
    when {
        size > newSize -> for (i in newSize until size) pop()
        newSize > size -> when(get(0)){
            is Dbvt.StkNN -> for (i in size until newSize) add(Dbvt.StkNN())
            is DbvtNode -> for (i in size until newSize) add(DbvtNode())
        }
    }
}

complains at

add

Out-projected type 'kotlin.collections.ArrayList<*> /* = java.util.ArrayList<*> */' prohibits the use of 'public open fun add(element: E): Boolean defined in java.util.ArrayList```

On another topic, Which would you choose? Goal: reassign

filters[property]

if merging two nullable sets yields a non-empty set 1️⃣

val additional: Set<T>? = filterStates[requested]
if (additional is Set<*> && additional.isNotEmpty()) {
    val current: Set<T>? = filters[property]
    if (current is Set<*> && current.isNotEmpty()) {
        filters[property] = current.plus(additional)
    } else {
        filters[property] = additional
    }
}

2️⃣

filters[property].plusMaybe(filterStates[requested.value])?.let {
    filters[property] = it
}

fun <T : Any> Set<T>?.plusMaybe(other: Set<T>?): Set<T>? = (this ?: emptySet()).plus(other ?: emptySet()).takeIf { it.isNotEmpty() }

What does

if (current is Set<*> && ...)

even do? Check whether it isn't null?

return x to y?

The

map

,

filter

, ... operations on Sequence are lazy, while the same operations on Iterator Iterable are eagerly evaluated.

Can anyone help me out with it please

any good Kotlin tutorials for someone with 2 yrs Java experience?

I found KotlinTest and that seems nice (I used ScalaTest back when I was doing Scala... about seven years ago).