Looking for open source projects that are using npm-publish gradle plugin. I'd like to build a small showcase section on the plugin repo with sample use-cases out there in the wild.

Kotlin Plugin 2021.1 Released: Improved IDE Performance and Better Support for Refactorings The newest release of IntelliJ IDEA, version 2021.1, comes with the improved Kotlin plugin. Enjoy an improved developer experience with faster code completion and highlighting, change signatures with better IDE support, benefit from better debugging experience for evaluating properties, and more. Here is what you’ll get by installing the new plugin: Faster code completion and […]

https://twitter.com/kotlin/status/1379744985357111301 📢 Kotlin Plugin 2021.1 Released! 🚀 Enjoy quick code completion and highlighting 🚀 Change signatures with better IDE support 🚀 Evaluate custom getters right in the Variables view Update IntelliJ IDEA to get improved support for Kotlin! Details here ⬇️ https://t.co/mXpwkIDSJx Twitter

Anyone please help..how to resolve this? Overload resolution ambiguity: public open fun <T : Any!> fromJson(p0: JsonElement!, p1: Type!): TypeVariable(T)! defined in com.google.gson.Gson public open fun <T : Any!> fromJson(p0: JsonReader!, p1: Type!): TypeVariable(T)! defined in com.google.gson.Gson public open fun <T : Any!> fromJson(p0: Reader!, p1: Type!): TypeVariable(T)! defined in com.google.gson.Gson public open fun <T : Any!> fromJson(p0: String!, p1: Type!): TypeVariable(T)! defined in com.google.gson.Gson

Any simple solution for creating a runnable (main class set in manifest) kotlin/jvm jar with gradle kotlin dsl? None of the provided templates (in IntelliJ or Gradle) are working.

Hi there! Can anyone tell me how to activate the debugger for Kotlin/Native (linux)? Apparently I have incompatible versions provided by JetBrains. I have Latest IDEA 2021.1.

Hey, can someone explain me why this compiles?

fun foo () {
        val map: NavigableMap<String, String> = TreeMap()
        map["key"] = null
    }

Hey! This seems inconsistent. Does anyone know why? @thana

import java.util.*

fun compiles() {
    val map: AbstractMap<String, String> = TreeMap()
    map["key"] = null // non-null not enforced (platform type)
}

fun `does not compile` () {
    val map = TreeMap<String, String>()
    map["key"] = null // non-null enforced? Why? Isn't this also a platform type?
}

Is this the best way to return

true

only if all functions return

true

? (without putting them all on the same line... there's some code in between them)

var success = func1()
success = success && func2()
success = success && func3()

return success

Hey, is there any way to get in contact with a developer experience person at Jetbrains? We use Kotlin with IntelliJ every day but have some performance issues with automatic refactorings. We'd love for someone from IntelliJ to shadow one of our team programming sessions to see if we're using it wrong or if it could provide some useful feedback 🙂

Anyone know how to check for whether Kotlin Multiplatform project code is being run with the IDEA debugger/console attached? I have a test method that loops with a timeout if it takes too long, but when I leave the time elapsed checker in the loop, my breakpoints never get hit when running/debugging tests in IDEA.

Why does

runCatching

autocomplete to

kotlin.runCatching

in the IDE? If I remove

kotlin.

it still works fine.

Found something neat/interesting... I have this simple bit of code:

sealed class SealedTypes {
    companion object {
        val types = setOf(One, Two, Three)
    }

    object One : SealedTypes()

    object Two : SealedTypes()

    object Three : SealedTypes()
}

class TypeContainer {
    // Whichever type of SealedType this is set to is removed from the types set.
    var theType: SealedTypes = One
}

And a test that doesn't really do much:

@RunWith(AndroidJUnit4::class)
class ExampleInstrumentedTest {
    @Test
    fun test() {
        // uncomment this and the test will not crash
        // SealedTypes.types

        TypeContainer()
        SealedTypes.types.forEach { acceptNonNull(it) }
    }

    fun acceptNonNull(value: SealedTypes) {
        // no-op
    }
}

test()

surprisingly crashes with a NullPointerException:

java.lang.NullPointerException: Parameter specified as non-null is null: method kotlin.jvm.internal.Intrinsics.checkNotNullParameter, parameter value
	at com.personal.ktbugtest.ExampleInstrumentedTest.acceptNonNull(Unknown Source:2)
	at com.personal.ktbugtest.ExampleInstrumentedTest.test(ExampleInstrumentedTest.kt:20)
	at java.lang.reflect.Method.invoke(Native Method)
	...

anyone come to kotlin from scala or clojure? why did you switch

porting native code to Kotlin, if I want to move a group of elements in an Arraylist up front, what's my best option? C++ uses

stable_partition

Move elements for which a predicate is true to the beginning
*         of a sequence, preserving relative ordering.

Does Jetpack Compose support Raspberry Pi?

If I wanted to really tax the Kotlin compiler to help simulate long build times, anyone have a good idea of how to do that? I was thinking along the lines of writing a bunch of complex expressions but dunno if there are some alternatives

Hi there,Can anyone tell me where to ask questions about kotlin code?

java.lang.ClassCastException: kotlin.Unit cannot be cast to kotlin.Result

when using

useIR = true

Kotlin Version : 1.4.32 After upgrading to 1.4.32 all

runCatching { }

call are throwing

java.lang.ClassCastException

is there any bug or breaking changes in version 1.4.32 ? As an example

suspend fun connect(clientId: String): Boolean {
        if (isConnected) {
            Timber.d("Already connected to broker ${mqttClient.serverURI}")
            return true
        }
        mqttClient = MqttClient(BuildConfig.BROKER_URI, clientId, null)
        mqttClient.setCallback(mqttCallback)

        val result = withContext(<http://Dispatchers.IO|Dispatchers.IO>) {
            runCatching {
                Timber.d("Connecting to broker  ${mqttClient.serverURI}")
                val options = MqttConnectOptions().apply {
                    mqttVersion = MqttConnectOptions.MQTT_VERSION_3_1_1
                    isCleanSession = true
                    isAutomaticReconnect = true
                    maxReconnectDelay = 10000
                }
                mqttClient.connect(options)
                Timber.d("Broker connected.")
            }
        }
        result.exceptionOrNull()?.let { t ->
            Timber.e(t, "Failed to connect to the broker.")
        }
        return result.isSuccess
    }

Hello there :)

kt
val thisIsATest = "**bold** normal **even bold** normal2"

"\\*\\*([\\s\\S]+?)\\*\\*(?!\\*)".toRegex().replace(thisIsTest,".").let{
println(it)
}

Is there any way to print like

bash
.bold. normal .even bold. normal2

Instead of [the output from the above code]

. normal . normal2

Don't you think that 5 rules enumerated in

equals

doc are not full? Look at this code:

class MyClass {
    override fun equals(other: Any?): Boolean {
        return other != null
    }
}

1. Reflexive: for any non-null value x, x.equals(x) should return true. ✅ 2. Symmetric: for any non-null values x and y, x.equals(y) should return true if and only if y.equals(x) returns true.✅ 3. Transitive: for any non-null values x, y, and z, if x.equals(y) returns true and y.equals(z) returns true, then x.equals(z) should return true.✅ 4. Consistent: for any non-null values x and y, multiple invocations of x.equals(y) consistently return true or consistently return false, provided no information used in equals comparisons on the objects is modified.✅ 5. Never equal to null: for any non-null value x, x.equals(null) should return false.✅ But this code leads to the strange behavior:

println(MyClass() == Any()) // true
println(Any() == MyClass()) // false

Is there a way to flag a collection as non-empty to the compiler in the same way you can flag a variable as non-null - or has it already been considered/proposed?

What's difference and when should each be used? 🤔

sealed class Fruit
object Apple : Fruit()
object Banana : Fruit()

vs

sealed class Fruit {
   object Apple : Fruit()
   object Banana : Fruit()
}

All these

build-1.5.20-dev-5029

makes release page extremely noisy to follow Kotlin's Github release page via RSS.

Found a super good question here on SO someone asked: https://stackoverflow.com/questions/67066647/kotlin-what-is-the-point-of-private-variables-inside-private-companion-objects

Can anyone recommend a tool that allows you to attach a kotlin repl to an already running JVM process? As the target environment is CLI only, intellij wouldn't be a choice. I'm looking for something like scalive for scala or liverepl for clojure.

Which Kotlin book should I recommend to my teammate who is going to start with Kotlin? (He has experience with Python).

Where do you usually publish your kotlin libraries? On Maven Central (since the sunset of bintray/jcenter)? If so what do you use for publishing? It seems to me to be so overly complicated (pgp signing, staging area, manual intervention...). Has anybody made it simple?

Hello guys . I have presentation of compose . I looking for good ready powerpoint file . because my time is low

I’ve found a case where type-inference “hides” a compile-time error and turns it into a runtime problem. I have this snippet:

class Holder<out T>(val make: () -> T)
fun <T> Holder<T>.test(value: T) = check(value == make())

fun main() {
    val h: Holder<Int> = Holder { 10 }
    h.test("what?") // intuitively, should not compile
}

I would expect that this code does not type-check, because I am trying to compare

Int

and

String

. However, in the call to

test

,

T

is inferred to

Any

. Which actually allows you to pass any argument whatsoever, and it will compile. The problem is that

Holder

class is a library class, that I cannot modify. However, the

test

function I can modify, but without changing its signature. Is there a way to make the

test

function check that

T

is actually the same at the call-site without explicit typing? (

h.test<Int>("what?")

) P.S. Removing

out

modifier from the

Holder

signature solves the problem, but unfortunately, the

Holder

class comes from a dependency.