How can you use ReactJS with Kotlin? Is that even possible?

Hi, noob question : If I create an

object

, does instanciating it two times creates two instances ?

If you could clarify the proper Kotlin syntax for this specific issue.... That would be great

I am trying custom delegate in kotlin https://try.kotlinlang.org/#/Examples/Delegated%20properties/Custom%20delegate/Custom%20delegate.kt How can i get the value of the variable from within the delegate class?

How do I write this kind of pattern in Kotlin?

while ((line = inp.readLine()) != null) {
            result.append(line)
        }

is there a way to make a current java class a data class so I have access to the data class functions? I really only need copy(), so I could probably just make an extension function for it.

Hey, is there a better way to create properties where getters and setters are protected using a lock? private val lock = ReentrantReadWriteLock() fun getName(): String { lock.readLock().lock() try { return name } finally { lock.readLock().unlock() } }

Hi. Anyone could tell me what this type means?

val results: (MutableList<(MutableMap<String!, Any!>..Map<String!, Any!>?)>..List<(MutableMap<String!, Any!>..Map<String!, Any!>?)>?)

especially the double dots. The function that returns that type was actually returning this java type,

List<Map<String, Object>>

Anyone else got this error :

error: cannot access NonExistentClass
  class file for error.NonExistentClass not found
  Consult the following stack trace for details.
  com.sun.tools.javac.code.Symbol$CompletionFailure: class file for error.NonExistentClass not found
1 error

When trying to use Dagger 2 along with Kotlin?

@fred.deschenes https://gist.github.com/josebalius/3cd46d3d0dcf0bf57792ac1c512dec1d

Only the constants you define are the values of the enum.

Hi, I am trying this problem https://try.kotlinlang.org/#/Examples/Problems/Index%20of%20Maximum/Index%20of%20Maximum.kt Here is my code

package maxindex

fun indexOfMax(a: IntArray): Int? {
    if (a.isEmpty())
    	return null
    return a.indexOf(a.max()!!)
}

I am getting all tests passed except

testIndexOfMaximum6

and

testIndexOfMaximum7

. I can't find the bug. Pls help

Yeah, unfortunately if the existing class doesn’t have a companion method you can’t add companion extension methods 😞

Hi everyone, quick question, can we use

when

with strings? Whenever i try using when with a string i get an error:

>>> val test = "Hello"
>>> val test2 = test.replace("lo", "1")
>>> println(test2)
Hel1
>>> when(test2) { 'Hel1' -> println("Hello world") }
error: incompatible types: Char and String
when(test2) { 'Hel1' -> println("Hello world") }
              ^

what's a better way of writing this?:

class EmbeddedJettyFactory(jettyServer: () -> Server) : EmbeddedServerFactory {
    private var server = Server(QueuedThreadPool(200, 8, 60000))
    init {
        this.server = jettyServer.invoke()
    }
}

Hi all, In Java, we can use gradle to point to a specific lib. In kotlin, can we use the same mechanism? How? For example, I have some *.kt extension functions for Android. How can I publish as common libs for other projects to import?

@nkiesel Are you working in a gradle project? If so, you can try updating it in the gradle tab on the right.

how to use extension function from one module tests in another module tests?

@Ruckus where is square bound?

hi, anyone here tried to use Kotlin Educational Plugin : https://blog.jetbrains.com/kotlin/2016/03/kotlin-educational-plugin/ ?

Oh so currently its another way of loading up kotlin koans 🤔

I'm declaring this extension functions in the same file as the data class, but I'm unable to use them in other classes

why not just declare the functions in the class?

hi everyone, what is difference between companion object and object keyword? tks so much

Did you create a new project by clicking File -> New -> Project, and choosing Kotlin in the window that popped up?

I change port...

recyclerView

does not use its adapter - no run

getItemCount

layoutManager

properly set in

onViewCreated

any ideas?