Mutable state defined inside or outside coroutines - does it matter? @tscha wrote: These might be two stupid questions, but i need to be sure I understood correctly. In Kotlin documentation there is this example: // This function launches a new counter actor fun CoroutineScope.counterActor() = actor { var counter = 0 // actor state for (msg in channel) { // iterate over incoming messages when (msg) { is IncCounter -> counter++ is GetCounter...

How to fix this setter & getter? @adamfr1998 wrote: Please help me to finish my online learning academy. The question is as follows: TODO 1: Complete the code in the Cat class with the following provisions: -Create a getter setter function for the Sleep property in which there is a function for printing text: The getter/setter function is invoked -Add the code in the toSleep() function to print the text: [$name], sleep! If sleep is true and...

Allow Java classes to specify declaration-site variance @overmind wrote: Currently Kotlin compiler treats all type parameters on Java classes as invariant, which can cause valid code to be rejected. The simplest way to solve this is to translate that Java file to Kotlin and manually add declaration-site variance, which only works if we have full control of the source file and its build system (i.e. We are able to add kotlin stdlib dependency to it). I also know that...

Serve Kotlin/JS distribution as static assets in Kotlin/JVM project with Ktor @axelfontaine wrote: I have the following project structure: MyProjectBuiltWithGradle |- MyClientKotlinJSModule |- MyServerKotlinJVMModuleWithKtor What is the best way to take the assets produced by MyClientKotlinJSModule (resources + compiled JS file which includes my code and the Kotlin/JS runtime) and serve them as static content using Ktor as part of the MyServerKotlinJVMModuleWithKtor with either...

How to exclude kotlin files from compiling with gradle @crease.xu wrote: When I create an Android Project with Java only, these code below works well: sourceSets { main { java { exclude '**/ExcludeClass.java' } } } But when I apply the kotlin-android plugin, it is complete failure. This class wasn’t removed by gradle(both of them are not removed): sourceSets { main { java {...

Kotlin/JS project doesn't build properly for production @franco wrote: Hi, I’m building a web app with Kotlin/JS and React and everything was working fine while running it locally in development mode, but when I built it in production mode to host it in a server suddenly it didn’t work and I got the following error: Uncaught TypeError: y is not a function at Object.r (example-app.js:720) at Object. (example-app.js:720) at n (bootstrap:19) at Object....

Kotlin compiler pre-release problem in android studio IDE @ilhamfidatama wrote: I’m having problems with the project in Android Studio. I get a error message like this Class ‘kotlin.Unit’ is compiled by a pre-release version of Kotlin and cannot be loaded by this version of the compiler almost all of my program code in the project gets the same error message. even though it’s just a simple program code, like this <a class="lightbox"...

Embed (inline) file into variable @Psijic wrote: Hello, what is the way to embed (inline) file into variable in Kotlin (with Android, so, no extra permissions needed)? F. e.: @Embed(name = 'mock.json') val jsonFile: String Is there a better way to use it with Moshi? The bad way I found is to use an ad-hoc (JSON sample): val mock = """ {"key":"value"} """ Posts: 1 Participants: 1 <a...

Show physical address in Google Maps API @mreyes wrote: I’m developing a Kotlin application using Google Maps API. I would like to show into snippet or title the physical address when is touching the Marker. The application allows create markers when is long pressed (Using setOnMapClickListener). After this you can see the marker latitude and longitude when is clicked like the next picture: <a class="lightbox"...

Class xxx() : yyy(){} to c# or java? @username77 wrote: Hi all, im an c# user and i never used kotlin/java before. I have this working code on kotlin but im not able to convert into c# or to convert to java then to c#. Any idea how to convert this class? is an lightstreamer request, maybe an extend class of this class SessionRequest() //code start //--------------------------------------------------------------- package...

Hide the implicit class created by local functions from my library's users @blastrock wrote: Hi, I am making a Kotlin library that will be used by Java projects. In my library I have a helper file, lets name it Utils.kt. I have an internal fun doStuff() local function in there. When importing the library in a Java project, there is an UtilsKt class that is accessible and appears in the auto-complete. Is there a way to make that class internal too? I have another problem with that...

ERROR: Cannot access 'java.io.Serializable' which is a supertype of 'kotlin.Int'. Check your module classpath for missing or conflicting dependencies @Mazen_Marei wrote: So I’ve decided to learn how code in Kotlin this morning on eclipse. Whenever I try to do an arithmetic operation Im always met with this error : ERROR: Cannot access ‘java.io.Serializable’ which is a supertype of ‘kotlin.Int’. Check your module classpath for missing or conflicting dependencies This is the code I wrote (just testing the waters with this language ) fun main() {...

Why doesn't my .text or .append work in my function? @celjcezar wrote: I am working on research project and I am building a simple calculator to gain understanding of Kotlin. There is an error, I cannot figure out. My .text and .append do not seem to work in my function? <a class="lightbox" href=""...

Exclude Kotlin file in Java path @crease.xu wrote: In An Android project, when I need to exclude a Kotlin file: sourceSets { getByName("main") { withConvention(KotlinSourceSet::class) { kotlin.srcDir("src/main/kotlin") kotlin.exclude("**/ExampleExcludeKotlinClass.kt") } } } It works. But when I add the directory into java.srcDirs, it’s full failure. Is there something I missed？...

Can anyone tell me why Kotlin cannot generate list from sequence of 1M elements? @enshahar wrote: I am playing with kotlinc REPL and tried to generate a list from a sequence with 1M elements (to compare it with creating an array and convert the array to a list), but the test failed with OOME. So I just created a .kt file and run the program using java command with 8GB max and 2GB min heap size. The program is just like that: import java.lang.Runtime.getRuntime fun main() {...

A failure occurred while executing org.jetbrains.kotlin.gradle.internal.KaptExecution @smamran wrote: I am getting this error building vlc-android from source. Task vlc androidkaptDebugKotlin FAILED FAILURE: Build failed with an exception. What went wrong: Execution failed for task ‘vlc androidkaptDebugKotlin’. A failure occurred while executing org.jetbrains.kotlin.gradle.internal.KaptExecution java.lang.reflect.InvocationTargetException (no error message) Posts:...

Does it make sense to use Kotlin for hadoop ecosystem libs? @greed2411 wrote: Hey, So I’m from python (only) background, my life revolves around simple simple data packages (scikit-learn, pandas etc) which work great with data that can fit inside memory. I’m exploring options where the data is too big (thus big data) to fit inside memory, and hadoop ecosystem has way too many tools that one can leverage (Spark, Flink, Hive, Presto etc each serving different purposes,...

Increase Number Picker Wheel Item Count - Default set to 3 items in the Wheel @bobtom wrote: Hello guys! I am new to Kotlin and I cannot figure out to display more then 3 elements in a wheel. For example if the array is 1 to 10 the wheel will display (wheel is wraped) 10 1 2 I am trying to have the wheel to display 5 elements (should look something like this) 9 10 1 2 3 I look through stackoverflow and find out there is this code that is set to 3 SELECTOR_WHEEL_ITEM_COUNT = 3 This code is...

Problem with generic (`CapturedType`) @kr5ture wrote: Hello, I have encountered a problem with generics. I’m trying to use a library which can trigger handler for a specific event. There is a HandlerRegistry#registerHandler to bind event classes to handlers: import kotlin.reflect.KClass // =============================================================== // Code out of my control (library) //...

Kotlin noarg plugin invokeInitializers example @paulorudolph07 wrote: hi guys, everything ok? I searched the internet but I didn’t find examples of using the noarg plugin with invokeInitializers. How do I initialize an attribute in my constructor generated by the plugin Posts: 1 Participants: 1 <a href="https://discuss.kotlinlang.org/t/kotlin-noarg-plugin-invokeinitializers-example/17074">Read full...

Kotlin lateinit Autowired issue in spring boot @sridharmcakec wrote: I’m not able to get bean in spring boot with autowired annotation. I just described my full issue in the following stackoverflow: Stackover flow link Please help me to fix this Posts: 1...

Inlining Tiny Methods @derektom14 wrote: Normally, when you add inline to a method that doesn’t contain any lambda parameters, you get the following compiler warning: [NOTHING_TO_INLINE] Expected performance impact from inlining is insignificant. Inlining works best for functions with parameters of functional types However, within the Kotlin standard library, we can see that some methods that violate this rule are inlined, such...

Does/will Kotlin/JS support inline classes? @tango24 wrote: The topic says it all. Any information on this? Posts: 1 Participants: 1 Read full topic

I just learned Kotlin, why is this an error? @rendyvickrian wrote: fun main() { initMenu() var scanner = Scanner(System.in) var listWeapon = mutableListOf() var listMagicWeapon = mutableListOf() var listWeapon = mutableListOf() var listMagicWeapon = mutableListOf() } fun initMenu() { fun main() { do { initMenu() val menu = scanner.nextInt() scanner.nextLine() } while (menu !=5) } println("Welcome to Dungeon Store...

Is it possible to add a "code block" button to the text editor @Wasabi375 wrote: Many new people to the site have problems formating their code. One reason for this is that there isn’t any button to add a code block to the text your writting. There are options for quotes, bold, italic, lists etc but not for code blocks. It would be nice if there is a button for “code block”. Also “Preformated Text” could be renamed to “inline code” or something more descriptive....

Getting E type in List&lt;E&gt; @ptdede wrote: Hi, I want to get type of List classifier List for example using reflection. How can I achieve this? Is it right using reflection? I try: data class Place ( val id: Int, val destinations: List ) fun main () { val aPlace = Place::class aPlace.memberProperties.forEach { property -> val propType = property.returnType val propName = property.name val...

Breakpoints don't work @mn.ntrworld wrote: Sometimes breakpoints don’t work. I managed to solve the problem by reinstalling the app on Android and re-enabling the developer mode. But now it won’t go. I don’t know why does it happen My console:

04/14 001157: Launching ‘app’ on Xiaomi Redmi Note 8 Pro.

$ adb shell am start -n "com.example.generator/com.example.generator.MainActivity" -a android.intent.action.MAIN -c...

Subclass exposes its internal supertype @Void wrote: Inheritance chain like this is not allowed: Public class > Internal implementation > Public interface. And gives compile time error: Subclass exposes its internal supertype. I just wonder how exactly it exposes? Internal implementation doesn’t have any new public methods, just those which are already exposed, so what exactly is exposed? class Public : InternalImpl() { override fun publicFun() {...

Contract to indicate boolean state in lambda function? @Loke wrote: I have built the following implementation of unless: inline fun unless(cond: Boolean, fn: () -> Unit) { contract { callsInPlace(fn, InvocationKind.AT_MOST_ONCE) } if (!cond) { fn() } } Is there a way to specify in the contract that fn will only be invoked if cond is false? That is needed in order for smart casts to work in the following code: unless(x is Foo) { throw...

Kotlin test assertFailsWith should provide the original stack trace @Loke wrote: I have some code that runs a test like so: assertFailsWith { // some code that should throw APLEvalException } This test fails, because the code throws ArrayIndexOutOfBoundsException instead: Expected an exception of class array.APLEvalException to be thrown, but was java.lang.ArrayIndexOutOfBoundsException: Index 5 out of bounds for length 4 java.lang.AssertionError: Expected an exception of...