# Latest **URL:** https://discuss.kotlinlang.org/latest.md?no_subcategories=false&page=3 [Latest](https://discuss.kotlinlang.org/latest.md) · [Categories](https://discuss.kotlinlang.org/categories.md) **Page:** 4 --- ## [LongRange.count() returns Int and cause an Exception](https://discuss.kotlinlang.org/t/longrange-count-returns-int-and-cause-an-exception/30878)
**Author:** [@przemek.materna](https://discuss.kotlinlang.org/u/przemek.materna)\ **Replies:** 7\ **Last updated:** [December 8, 2025, 10:53pm UTC](https://discuss.kotlinlang.org/t/longrange-count-returns-int-and-cause-an-exception/30878 "2025-12-08T22:53:03Z")
There is a LongRange, which exposes a method count(), by Iterable\ extension: package kotlin.collections // file: \_Collections.kt public fun \ Iterable\.count(): Int { if (this is Collection) return size … --- ## [What are the differences between Kotlin Multiplatform & Compose Multiplatform?](https://discuss.kotlinlang.org/t/what-are-the-differences-between-kotlin-multiplatform-compose-multiplatform/30865)
**Author:** [@dcs.79c](https://discuss.kotlinlang.org/u/dcs.79c)\ **Replies:** 5\ **Last updated:** [December 8, 2025, 9:04am UTC](https://discuss.kotlinlang.org/t/what-are-the-differences-between-kotlin-multiplatform-compose-multiplatform/30865 "2025-12-08T09:04:41Z")
I installed IntelliJ on my Mac. I have a book on Kotlin programming. I’m learning Kotlin! I’ve explored different programming languages - BASIC(before it became Visual Basic), Visual Basic, Turbo Pascal, & Java. Java is… --- ## [Weird and Unsolvable Exception](https://discuss.kotlinlang.org/t/weird-and-unsolvable-exception/30573)
**Author:** [@Abhiram\_Deshpande](https://discuss.kotlinlang.org/u/Abhiram_Deshpande)\ **Replies:** 11\ **Last updated:** [December 5, 2025, 7:59am UTC](https://discuss.kotlinlang.org/t/weird-and-unsolvable-exception/30573 "2025-12-05T07:59:16Z")
Hi. While developing an app on Android Studio ( Meerkat Feature Drop | 2024.3.2 Patch 1 ), everything was going fine till today morning when, in order to create a ViewModel and Relevant Factory, I created a class called … --- ## [I’d like to be able to plot trig functions & fractals & parametric equations on Kotlin](https://discuss.kotlinlang.org/t/i-d-like-to-be-able-to-plot-trig-functions-fractals-parametric-equations-on-kotlin/30867)
**Author:** [@dcs.79c](https://discuss.kotlinlang.org/u/dcs.79c)\ **Replies:** 3\ **Last updated:** [December 4, 2025, 8:46pm UTC](https://discuss.kotlinlang.org/t/i-d-like-to-be-able-to-plot-trig-functions-fractals-parametric-equations-on-kotlin/30867 "2025-12-04T20:46:56Z")
I’d like to be able to plot trig functions & fractals & parametric equations on Kotlin. I read about Let’s Plot. Back when Basic was Basic & not Visual Basic, I created programs that plotted parametric equations. It was … --- ## [Extra branches in the when statement (coverage)](https://discuss.kotlinlang.org/t/extra-branches-in-the-when-statement-coverage/30874)
**Author:** [@exfaust31](https://discuss.kotlinlang.org/u/exfaust31)\ **Replies:** 0\ **Last updated:** [December 3, 2025, 2:58pm UTC](https://discuss.kotlinlang.org/t/extra-branches-in-the-when-statement-coverage/30874 "2025-12-03T14:58:42Z")
Trying to get code coverage with a “when” expression using Kover or Intellij Coverage Plugin. There are always extra branches that prevent you from achieving 100% coverage. For example, the Intellij Coverage plugin and … --- ## [Having difficulty adapting the RabbitMQ client to coroutines](https://discuss.kotlinlang.org/t/having-difficulty-adapting-the-rabbitmq-client-to-coroutines/24163)
**Author:** [@mrpug](https://discuss.kotlinlang.org/u/mrpug)\ **Replies:** 6\ **Last updated:** [December 2, 2025, 3:25pm UTC](https://discuss.kotlinlang.org/t/having-difficulty-adapting-the-rabbitmq-client-to-coroutines/24163 "2025-12-02T15:25:53Z")
Hi all, I’m attempting to integrate a RabbitMQ consumer into a Kotlin project that uses coroutines heavily, but I’m having some issues adapting the RabbitMQ calls into coroutine calls. Has anyone done anything similar t… --- ## [Suggested new construct for tight code](https://discuss.kotlinlang.org/t/suggested-new-construct-for-tight-code/30866)
**Author:** [@digorydoo](https://discuss.kotlinlang.org/u/digorydoo)\ **Replies:** 3\ **Last updated:** [December 2, 2025, 6:42am UTC](https://discuss.kotlinlang.org/t/suggested-new-construct-for-tight-code/30866 "2025-12-02T06:42:41Z")
If you have an algorithm that is already O(n^2), that’s already bad. But if your inner loop creates new objects that need to be garbage-collected, that’s terrible! Here’s a suggestion how we could help both the programme… --- ## [Empty Main function](https://discuss.kotlinlang.org/t/empty-main-function/30864)
**Author:** [@dcs.79c](https://discuss.kotlinlang.org/u/dcs.79c)\ **Replies:** 2\ **Last updated:** [November 28, 2025, 4:07am UTC](https://discuss.kotlinlang.org/t/empty-main-function/30864 "2025-11-28T04:07:28Z")
I read online that the Main function is the starting point of the program. Is it possible to start a Kotlin program with an empty Main function, that is, fun Main(), & nothing else? I’m intrigued about Kotlin & I’m eag… --- ## [Why does takeIf allow nullable receivers in its predicate?](https://discuss.kotlinlang.org/t/why-does-takeif-allow-nullable-receivers-in-its-predicate/30863)
**Author:** [@fvasco](https://discuss.kotlinlang.org/u/fvasco)\ **Replies:** 0\ **Last updated:** [November 25, 2025, 1:25pm UTC](https://discuss.kotlinlang.org/t/why-does-takeif-allow-nullable-receivers-in-its-predicate/30863 "2025-11-25T13:25:45Z")
The signature of takeIf (and takeUnless) is: public inline fun \ T.takeIf(predicate: (T) -\> Boolean): T? instead of: public inline fun \ T?.takeIf(predicate: (T) -\> Boolean): T? Why does Kotlin allow null a… --- ## [Make it easy to repeat something until it succeeds, but at most n times](https://discuss.kotlinlang.org/t/make-it-easy-to-repeat-something-until-it-succeeds-but-at-most-n-times/8097)
**Author:** [@dcuser](https://discuss.kotlinlang.org/u/dcuser)\ **Replies:** 13\ **Last updated:** [November 25, 2025, 12:56pm UTC](https://discuss.kotlinlang.org/t/make-it-easy-to-repeat-something-until-it-succeeds-but-at-most-n-times/8097 "2025-11-25T12:56:27Z")
These loops: for (i in 0..2) { doSomething() if(somethingFailed()) { continue } break } could maybe be expressed better. Something like this would be nice: try (maxTries = 3) { doSomething… --- ## [Parse Kotlin build.gradle.kts Script via ScriptDefinition](https://discuss.kotlinlang.org/t/parse-kotlin-build-gradle-kts-script-via-scriptdefinition/30862)
**Author:** [@PhilKes](https://discuss.kotlinlang.org/u/PhilKes)\ **Replies:** 0\ **Last updated:** [November 21, 2025, 11:29am UTC](https://discuss.kotlinlang.org/t/parse-kotlin-build-gradle-kts-script-via-scriptdefinition/30862 "2025-11-21T11:29:52Z")
Use Case: OpenRewrite is a tool to performce large-scale code migrations/refactorings which leverages parsing Java/Groovy/Kotlin sources and performing modifications on them. For Kotlin you can find the parsing code in… --- ## [JVM dependencies are not clear to me, esp. Regex](https://discuss.kotlinlang.org/t/jvm-dependencies-are-not-clear-to-me-esp-regex/30854)
**Author:** [@redflitzi](https://discuss.kotlinlang.org/u/redflitzi)\ **Replies:** 6\ **Last updated:** [November 21, 2025, 9:27am UTC](https://discuss.kotlinlang.org/t/jvm-dependencies-are-not-clear-to-me-esp-regex/30854 "2025-11-21T09:27:59Z")
Hi, as a Kotlin beginner, I am not sure what I can use when I want to create a JVM independent library. I try to use only the “Common part” of the documentation, as for my purposes this seems feasable avoiding implemen… --- ## [Capturing context parameter](https://discuss.kotlinlang.org/t/capturing-context-parameter/30859)
**Author:** [@msevcenko](https://discuss.kotlinlang.org/u/msevcenko)\ **Replies:** 2\ **Last updated:** [November 20, 2025, 9:19am UTC](https://discuss.kotlinlang.org/t/capturing-context-parameter/30859 "2025-11-20T09:19:59Z")
I am investigating the new feature of kotlin, Context parameters. In some edge situations, you may have a block of code that has accessible some context(s), which are however not directly accessible (not bound to any va… --- ## [Exposed-kotlin-datetime](https://discuss.kotlinlang.org/t/exposed-kotlin-datetime/22976)
**Author:** [@huggy](https://discuss.kotlinlang.org/u/huggy)\ **Replies:** 2\ **Last updated:** [November 19, 2025, 8:56am UTC](https://discuss.kotlinlang.org/t/exposed-kotlin-datetime/22976 "2025-11-19T08:56:12Z")
i see this module in the exposed source, yet i cannot find it in any maven repository. How can i use use this. The library basically lets us use the kotlin localdatetime instead of the java version. --- ## [Assignments as expressions](https://discuss.kotlinlang.org/t/assignments-as-expressions/1564)
**Author:** [@norswap](https://discuss.kotlinlang.org/u/norswap)\ **Replies:** 2\ **Last updated:** [November 12, 2025, 4:21pm UTC](https://discuss.kotlinlang.org/t/assignments-as-expressions/1564 "2025-11-12T16:21:27Z")
Is there a discussion or rational to forbidding using an assignment as an expression in Kotlin? I love the ability Kotin gives me write terse code, but this goes kind of contrary to that. I understand the risks, but so… --- ## [Segfault crash invoking kotlinc-native (konan)](https://discuss.kotlinlang.org/t/segfault-crash-invoking-kotlinc-native-konan/30852)
**Author:** [@abdillah](https://discuss.kotlinlang.org/u/abdillah)\ **Replies:** 0\ **Last updated:** [November 10, 2025, 11:19pm UTC](https://discuss.kotlinlang.org/t/segfault-crash-invoking-kotlinc-native-konan/30852 "2025-11-10T23:19:40Z")
Hello, I would like to use Kotlin as native language. So, I create a simple file and invoke a compiler: $ kotlinc-native -version Current kotlin-native dir: /nix/store/\-kotlin-native-2.2.21 New writeable ko… --- ## [Null safety in javascript](https://discuss.kotlinlang.org/t/null-safety-in-javascript/6160)
**Author:** [@mattmook](https://discuss.kotlinlang.org/u/mattmook)\ **Replies:** 10\ **Last updated:** [November 10, 2025, 3:19pm UTC](https://discuss.kotlinlang.org/t/null-safety-in-javascript/6160 "2025-11-10T15:19:15Z")
I’ve started writing multi-platform modules and pretty quickly have started noticing some inconsistencies between JVM and JS and as such wanted to get a better understanding of what I should be doing. For example, given… --- ## [withContext breaks coroutine supervision](https://discuss.kotlinlang.org/t/withcontext-breaks-coroutine-supervision/30821)
**Author:** [@alexis](https://discuss.kotlinlang.org/u/alexis)\ **Replies:** 7\ **Last updated:** [November 9, 2025, 12:52pm UTC](https://discuss.kotlinlang.org/t/withcontext-breaks-coroutine-supervision/30821 "2025-11-09T12:52:38Z")
I have the following exception handler (just as example): class StatefulCoroutineExceptionHandler( private val logging: Boolean ) : CoroutineExceptionHandler { val throwables = mutableListOf\() ov… --- ## [Using multiple KMP modules in Swift](https://discuss.kotlinlang.org/t/using-multiple-kmp-modules-in-swift/30834)
**Author:** [@tomektomek](https://discuss.kotlinlang.org/u/tomektomek)\ **Replies:** 0\ **Last updated:** [November 4, 2025, 6:43am UTC](https://discuss.kotlinlang.org/t/using-multiple-kmp-modules-in-swift/30834 "2025-11-04T06:43:30Z")
For simplicity’s sake let’s consider a following dependency graph: kmpA (depends on kmpB) kmpB (no deps) swiftC (depends on kmpA and swiftD) swiftD (depends on kmpB) I’m trying to pass an object of type X (declared in… --- ## [Problem of mutating data class for use in Jetpack Compose](https://discuss.kotlinlang.org/t/problem-of-mutating-data-class-for-use-in-jetpack-compose/30831)
**Author:** [@Injent](https://discuss.kotlinlang.org/u/Injent)\ **Replies:** 4\ **Last updated:** [November 2, 2025, 7:34pm UTC](https://discuss.kotlinlang.org/t/problem-of-mutating-data-class-for-use-in-jetpack-compose/30831 "2025-11-02T19:34:20Z")
The problem: The difficulty of maintaining the “stability” of large classes for Compose and mutability. The inevitability of the boilerplate code. I ran into the problem that Kotlin together with Jetpack Compose cannot… --- ## [Should I convert from Groovy DSL to Kotlin DSL?](https://discuss.kotlinlang.org/t/should-i-convert-from-groovy-dsl-to-kotlin-dsl/30806)
**Author:** [@elpafras](https://discuss.kotlinlang.org/u/elpafras)\ **Replies:** 3\ **Last updated:** [November 2, 2025, 6:10pm UTC](https://discuss.kotlinlang.org/t/should-i-convert-from-groovy-dsl-to-kotlin-dsl/30806 "2025-11-02T18:10:52Z")
I have an Android application with Groovy DSL. Should I convert it to Kotlin DSL, and does anyone know how to convert from Groovy to Kotlin? --- ## [Kotlinc native compiler - How to import "kotlinx.cinterop" to use "memScoped"?](https://discuss.kotlinlang.org/t/kotlinc-native-compiler-how-to-import-kotlinx-cinterop-to-use-memscoped/25816)
**Author:** [@umydwbp935](https://discuss.kotlinlang.org/u/umydwbp935)\ **Replies:** 1\ **Last updated:** [October 31, 2025, 9:42am UTC](https://discuss.kotlinlang.org/t/kotlinc-native-compiler-how-to-import-kotlinx-cinterop-to-use-memscoped/25816 "2025-10-31T09:42:52Z")
Hi there, I would like to write something like this: val fileSize = memScoped { val statBuf = alloc\() val error = stat("/", statBuf.ptr) statBuf.st\_size } However, upon compilation I get: unresolved reference… --- ## [Unit is the worst naming](https://discuss.kotlinlang.org/t/unit-is-the-worst-naming/29843)
**Author:** [@CEO.Y](https://discuss.kotlinlang.org/u/CEO.Y)\ **Replies:** 40\ **Last updated:** [October 29, 2025, 1:38pm UTC](https://discuss.kotlinlang.org/t/unit-is-the-worst-naming/29843 "2025-10-29T13:38:37Z")
The word ‘unit’ is used very widely in the real world. For example, A Quantity class consists of ‘amount’ and ‘unit’. data class Unit( val code: String, val name: String, val symbol: String ) data class Qu… --- ## [What's an idiomatic way to name a function that takes \`() -\> Unit\` vs \`suspend () -\> Unit\`](https://discuss.kotlinlang.org/t/whats-an-idiomatic-way-to-name-a-function-that-takes-unit-vs-suspend-unit/30809)
**Author:** [@bp](https://discuss.kotlinlang.org/u/bp)\ **Replies:** 4\ **Last updated:** [October 28, 2025, 9:36pm UTC](https://discuss.kotlinlang.org/t/whats-an-idiomatic-way-to-name-a-function-that-takes-unit-vs-suspend-unit/30809 "2025-10-28T21:36:33Z")
I’m trying to get up to speed with Kotlin. One of the things I keep hitting snags with is how functions and suspend functions feel like oil and water and don’t mix. For example if I wanted to wrap some code like this: t… --- ## [How to use SQLite without GUI? only print console](https://discuss.kotlinlang.org/t/how-to-use-sqlite-without-gui-only-print-console/30803)
**Author:** [@vmercadolibretuc](https://discuss.kotlinlang.org/u/vmercadolibretuc)\ **Replies:** 4\ **Last updated:** [October 28, 2025, 12:43pm UTC](https://discuss.kotlinlang.org/t/how-to-use-sqlite-without-gui-only-print-console/30803 "2025-10-28T12:43:06Z")
With the GUI, everything is fine, but when I try to do it without the GUI, I get errors. Is this possible? I'm new to Kotlin. Thank you very much. --- ## [Union types](https://discuss.kotlinlang.org/t/union-types/77)
**Author:** [@salomonbrys](https://discuss.kotlinlang.org/u/salomonbrys)\ **Replies:** 141\ **Last updated:** [October 28, 2025, 8:59am UTC](https://discuss.kotlinlang.org/t/union-types/77 "2025-10-28T08:59:11Z")
I really like sealed types, and I would love for kotlin to support some kind of union type. e.g.: union JsonType { Boolean, Char, Number, String, JsonElement } public fun JsonObject.set(key: Stri… --- ## [A new feature for default arguments](https://discuss.kotlinlang.org/t/a-new-feature-for-default-arguments/30703)
**Author:** [@97jpfb](https://discuss.kotlinlang.org/u/97jpfb)\ **Replies:** 5\ **Last updated:** [October 27, 2025, 5:21pm UTC](https://discuss.kotlinlang.org/t/a-new-feature-for-default-arguments/30703 "2025-10-27T17:21:50Z")
Hello! Image a function that has a default argument. Is there a way to call this function with a certain argument if a condition is met, else use the default argument? Here’s some code: fun foo(arg: String = "Defaul… --- ## [Error on pausing / resuming / stoping the audio](https://discuss.kotlinlang.org/t/error-on-pausing-resuming-stoping-the-audio/30807)
**Author:** [@truebillionhari](https://discuss.kotlinlang.org/u/truebillionhari)\ **Replies:** 0\ **Last updated:** [October 27, 2025, 5:36am UTC](https://discuss.kotlinlang.org/t/error-on-pausing-resuming-stoping-the-audio/30807 "2025-10-27T05:36:21Z")
class AudioSource constructor ( context: Context ){ private val mediaRecorder = MediaRecorder(context) private val outputFile = File(context.getExternalFilesDir(Environment.DIRECTORY\_MUSIC),"sample.mp4") … --- ## [Use with finally](https://discuss.kotlinlang.org/t/use-with-finally/4848)
**Author:** [@benjishults](https://discuss.kotlinlang.org/u/benjishults)\ **Replies:** 5\ **Last updated:** [October 26, 2025, 11:58am UTC](https://discuss.kotlinlang.org/t/use-with-finally/4848 "2025-10-26T11:58:21Z")
The following would be nice: connection.use { // … } catch (e: UniquenessConstraintException) { // fix it } finally { // other stuff } I know “use” is currently a function and finally and catch are (soft) keyword… --- ## [Real-world health & posture app built with Compose Multiplatform + Ktor (Android, iOS, Backend)](https://discuss.kotlinlang.org/t/real-world-health-posture-app-built-with-compose-multiplatform-ktor-android-ios-backend/30801)
**Author:** [@til.pap](https://discuss.kotlinlang.org/u/til.pap)\ **Replies:** 0\ **Last updated:** [October 23, 2025, 8:34am UTC](https://discuss.kotlinlang.org/t/real-world-health-posture-app-built-with-compose-multiplatform-ktor-android-ios-backend/30801 "2025-10-23T08:34:00Z")
Hi everyone :waving\_hand: I wanted to share my production app StandProud — a real-world fitness app focused on posture correction and back-health improvement, built entirely with Compose Multiplatform and Ktor (Android,… [Previous page](https://discuss.kotlinlang.org/latest.md?no_subcategories=false&page=2) [Next page](https://discuss.kotlinlang.org/latest.md?no_subcategories=false&page=4)