Injected Dispatcher.IO not recognised as Dispatcher.IO I have a warning on Files.list([path]): Possibly blocking call in non-blocking context could lead to thread starvation According to android best practises, coroutine dispatchers should be injected instead of used directly. https://developer.android.com/kotlin/coroutines/coroutines-best-practices#inject-dispatchers Yet the...

Compiler plugin for AST manipulation It’s been a while since I’ve toyed with Kotlin compiler plugins. I just read about the Symbol Processing API, which is great for annotations and such. But it also implies AST manipulation is no longer a supported type of plugin. Or, am I misreading the docs? 1 post - 1 participant Read full topic

How MutableList() {} works? I have the habit to using MutableList(size) { readln().toInt() } this is the same that MutableList(size) { it → readln().toInt() } I am passing a lambda to populate the mutable list? 2 posts - 2 participants Read full topic

Multiplayform bigint library My project is a programming language that is implemented as a Kotlin multiplatform application. In my language, I needed to provide native bignum support, but I didn’t find any multiplatform implementation of BigInt. Of course, Java has BigInteger, JS has BigInt and in native code you have GMP. I have written a library that wraps these different implementations and presents a general API to work with bigints. Here’s an example: val a = BigInt.of("10000000000000000000000000000000") val b = 2...

Job opportunity Spain - Mobile Developer Hey developers, Sinch (www.sinch.com) has a great opportunity to be part of the Mobile Developer team in Spain. It’s a new project for the global market based on the cut-of-edge Kotlin Multiplatform technology with a modern backend-for-frontend architecture. If you want to work in Kotlin Multiplatform, learn Swift and Swift UI, be responsible for all mobile app stack and be part on an international team, this is for you! Based:...

Is Kotlin ABI stable? Hello! I have found in the documentation, some statements, like: Keep your library up-to-date. If you’re a library author, updating to the new Kotlin version is extremely important. Using older versions could block your users from updating Kotlin in their projects. and Change the versions of dependencies to EAP ones. The EAP version of Kotlin may not work with the libraries of the previously released version. Does it mean that some Kotlin versions are not compatible or not ABI stable?...

How to implement login/register screen before taking user to home screen using jetpack navigation component How to implement login/register screen before taking user to home screen using jetpack navigation component. I’m finding it difficult to understand to implement authentication screens before navigating user to home screen . 1 post - 1 participant Read full topic

How can I change Node.js version in Kotlin/JS project? Hi there. I have an app written in Kotlin/React, and after upgrading Kotlin version from 1.8.10 to 1.8.20, I cannot compile it anymore, getting this error (with 1.8.10 it works OK): $HOME/.gradle/nodejs/node-v18.12.1-linux-x64/bin/node: /lib/x86_64-linux-gnu/libc.so.6: version `GLIBC_2.28' not found (required by $HOME/.gradle/nodejs/node-v18.12.1-linux-x64/bin/node) I am on Ubuntu Linux 18.04 and do not have 2.28 glibc. I’ve found googling some advice on StackOverflow saying I should use...

String.matches() Regex? I am using the String method .matches(Pattern: Regex), but it seems that this is only true when the whole string matches the pattern known, If some string methods don’t need to match with the whole pattern? 1 post - 1 participant Read full topic

There is something like pyautogui made with kotlin Something to automate desktop tasks, or web tests. Something that can take control of the PC and type or move the mouse 1 post - 1 participant Read full topic

Cinterop can't find FILE type [ERROR] Hi there! I’m trying to build Kotlin/Multiplatform library, and I’m somewhat stuck with its Kotlin/Native implementation because of this error: Exception in thread "main" java.lang.Error: IdeaProjects\multifile\multifile-in-c\src\main\public\multifile.h1529: error: unknown type name 'FILE' Here is my multifile.h: #ifndef MULTIFILE_IN_C_MULTIFILE_H #define MULTIFILE_IN_C_MULTIFILE_H #include #include typedef struct { long size; unsigned char* bytesPointer; bool eof; }...

Run SpringBoot application with Kotlin through cmd Hi! I run SpringBoot application with Kotlin through command line. java some-name-SNAPSHOT.jar Result: Error: Could not find of load main class some-name-SNAPSHOT.jar But this application was run through IDEA successful. I use: Kotlin Maven Spring Boot How I can run kotlin springboot application through command line? <a class="lightbox" href=""...

Map() processed all items and can be very slow I am working with huge lists and have some performance problems: I narrowed it down to the following code: var counter1 = 0 var counter2 = 0 val list = ArrayList(100) for (i in 0 until 100) list.add(Point(i, 0)) list.map { it.x ++counter1 }.subList(0, 5).forEach { ++counter2 } Log.i("XXXXXXXXXXXXX", "counter1 == $counter1, counter2 == $counter2") I expected the output to be: I/XXXXXXXXXXXXX: counter1 == 5 counter2 == 5 But it actually...

‘when’ expression requires to be exhaustive, even be 'else' branch is empty I have an enum with 7 states, also I have several ‘when’ statements: when(state) { States.state1 → doForState1 States.state2, Stetes.state3 → doForState2and3 } // generate error that I need add States 4,5,6,7 or else branch As result, I added the else branch: when(state) { States.state1 → doForState1 States.state2, Stetes.state3 → doForState2and3 else → {} // do nothing } Early I had warnings only, but. Why I got the error after updating the version of Kotlin? Why compilator require an...

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Elvis operator (?:) always returns the left operand (.toString()) Given the following code : val statusCode: String = result?.httpStatusCode?.statusCode.toString() ?: Response.Status.NO_CONTENT.statusCode.toString() Why do I get the error : Elvis operator (? always returns the left operand of non-nullable type String If I understand the “?” correctly, result could be null or httpStatusCode could be null and therefore the toString function could never be called, requiring the right side of the operator? 1 post - 1 participant...

Novice user problems Kotlin with VSCode in WIndows I wanted to give Kotlin a go with VSCode on Windows. I downloaded the zip for 1.8.20. Windows 11 cannot unzip the file claiming that kotlin-master.zip is invalid. I was successful using 7-zip. The web page I was following suggests adding the bin folder to the path. At the top level of the unzipped kotlin-master there is no bin folder. Any suggestions? 1 post - 1 participant <a...

[Academic] [Survey] Java Spring Boot vs Ktor: Which Framework is More Accessible for New Developers? (All welcome) Hello everyone, I am a student working on a research project comparing Ktor and Java Spring Boot in terms of cyclomatic complexity and ease of use. Your input as developers with experience in either or both of these frameworks is invaluable to my research. I would greatly appreciate it if you could take a few minutes to complete this survey. Please be assured that your responses will be anonymous and used solely for the purpose of this study. The survey: <a...

Ways to guarantee a JNI type has some property value Our codebase’s C++ library provides an image type Sf3dImage( val type: Sf3dImageType, val width: Int, val height: Int, val buffer: ByteArray, ) Sf3DImageType is an enum with a variety of values, Greyscale, RGB, RGBA etc. I’d like to provide some guarantee that a passed parameter has the expected type. i.e. instead of: fun processImage(sf3d: Sf3dImage) Some kind of annotation that can check if the passed parameter has the required image type, similar to how i image @StringRes...

Learning Resources (Video) Hello I am trying to look for video resources where I can learn more about Kotlin/JS, and build full applications. More specifically, I want to know if I take a course on Kotlin (not kotlin/js) can the same code be applied to Kotlin/JS. Also, is Kotlin Koans for Kotlin or Kotlin/JS? Thanks. 1 post - 1 participant Read full topic

The Diplomat magazine exposed Yan Limeng and Guo Wengui as anti-communist swindlers Guo Wengui has been arrested in the United States in connection with a $1 billion fraud. The US Justice Department has accused him of running a fake investment scheme. Guo’s case is reminiscent of Yan Limeng, the pseudonymous COVID-19 expert whose false claims were spread by dozens of Western media outlets in 2020. Ms. Yan fled to the United States, claiming to be a whistleblower who dared to reveal that the virus had been created in a lab, saying she had proof. In fact, the two cases are...

Filter list to database Hello, I have a recycleview and an adapter to fill it but I have problems filtering a search within the list, my list is not local, my list is received from a function that is responsible for loading it to display it in a fragment, I have implemented several types of search methods but it simply does not show me anything from the list, my list is only replaced by an empty one without showing me anything… i need help 1 post - 1 participant <a...

Intellij idea does not show coroutine results but Kotlin Playgroun does import kotlinx.coroutines.* import kotlinx.coroutines.flow.Flow import kotlinx.coroutines.flow.MutableSharedFlow import kotlinx.coroutines.flow.launchIn import kotlinx.coroutines.flow.onEach import kotlin.random.Random fun randomSharedFlow(): Flow { val sharedFlow = MutableSharedFlow() GlobalScope.launch(Dispatchers.Default) { for (i in 0 until 10) { sharedFlow.emit(Random.nextInt(1,100)) delay(200) } } return sharedFlow } fun main()...

Strange BigDecimal result Hello friends, I am a bit confused at this behavior of BigDecimal, maybe someone has insight. When I compare: java.math.BigDecimal(0) == java.math.BigDecimal(0.00) // true However, when I compare: java.math.BigDecimal(0) == (0.00).toBigDecimal() // false Why is there a difference when converting from Double? I see that the standard library first converts double to String before making it a BigDecimal. Can this be why? And why convert it to String first?? 1 post - 1 participant...

Why Kotlin chose "object" keyword and not "singleton"? In reading documentation on Kotlin I often misinterpret the intent because of the word “object” in the text. I never read this as “a singleton”. To me (with my Java background) just about everything is an Object. An example of my struggle: If an object in Kotlin is a singleton, what is an instance of a class? It’s also taken me quite a while to come to terms with a companion object. The way I understand it is as follows : A companion object is a singleton that you create inside your class so...

Need help with Generics, contravariance needed Sorry that I’m giving a longer example, but I think it becomes clearer what I want to do: fun interface Pattern { fun test(obj: A): Boolean } class Matcher(private val obj: A) { private var result: R? = null fun otherwise(default: () -> R) = result ?: default() infix fun Pattern<A>.then(value: () -> R) { if (result == null && this.test(obj)) { result = value() } } } fun match(obj: A, body: Matcher.() -> R): R = Matcher(obj).run(body)...

Building the different konan targets on GitHub Actions I’m working on a Kotlin multiplatform project (GitHub - rhdunn/xqt-kotlinx-json-rpc: Kotlin multiplatform JSON-RPC 2.0 library) and am trying to figure out how to get the different native konan targets building on GitHub Actions. In my build.gradle.kts script, I currently have: val nativeTarget = when (HostManager.host) { KonanTarget.MACOS_ARM64 -> kotlin.macosArm64("native")...

Create map where each key has more that one value I want to kown that is some way to create a map where each key has more that one value in the idiomatic way Someone knows how create a map, where each key has more that one value? for simplify the process of do this: val map = mapOf( 1 to "one", 1 to "1" ) 1 post - 1 participant Read full topic