it's just a matter of the order of operations being different from what you expected. There's no bug here, though it's definitely a gotcha and I think a lint check would be great

and there should be a lint check to warn you that this might not mean what you think it does

Hi, I want to map an enum class like

enum class Status { OK, FAILED }

to a JSON response (with Moshi). Unfortunately the JSON values are written in lower case like “ok” or “failed” and it’s not possible to overwrite the enum classes’ values. Any chances this is somehow possible or do I have to write a custom Moshi adapter?

you can do [ "loL" ] in annotations instead of arrayOf("lol")

e.g.

thing {
    a = "test"
    b = "wat"
}

I’m not suggesting that the compiler should do anything different if you’re explicitly defining a property as a different type. But my question isn’t about defining 2 properties as

Any

and expecting it to find the equals of the assigned type instead of the defined type

So this is not a real “equals” and will not be used by system. Of course, you can use it manually, but for example HashMap or other system code just ignores these methods You can do the same thing in Kotlin, but of course it’s not correct convention for equals

It also just does not work. You cannot "override" member functions with extension functions. If you use the

==

it will never call an extension function (same if you call

equals

directly), since the

equals

in

Any

always has higher precedence.

Sorry for this conversation dragging in #general. A thread in #codingconventions would’ve probably been more appropriate

After replacing kotlin-compiler with kotlin-compiler-embeddable guava problem went away:

compile "org.jetbrains.kotlin:kotlin-script-util:$kotlinVersion", {
	exclude module: 'kotlin-compiler'
}
compile "org.jetbrains.kotlin:kotlin-compiler-embeddable:$kotlinVersion"

Now application compiles, but does not start, because kotlin-compiler-embeddable bundles xmlpull which clashes with xstream dependency which we use in the app:

org.xmlpull.v1.XmlPullParserException: No valid parser classes found in resource /META-INF/services/org.xmlpull.v1.XmlPullParserFactory that contained 'org.xmlpull.mxp1.MXParserFactory'

I'm abandoning the experiment. Seems embedding kotlin scripting in a serious real-world application is impossible at this point and we'll have to stick with Groovy. 😢

It is probably unintuitive from java convert's point of view, but it is logical, constructor is a function with the same name as the class, so

::StringBuilder

is the reference to that function.

I think Kotlin sees the former as, i.e. as 2 declarations: companion object without members and a property:

companion object
val yo = "yo"

i feel like this should work, but i get “Type inference failed - required

List<List<String>>

, found

List<Any>

kotlin
    val hmm: List<List<String>> = listOf(
            listOf("a"),
            listOf("b")
    )
    val hmm2: List<List<String>> = hmm + listOf("c")

Kotlin 1.1.50 is coming! :kotlin-flag: 👌🏽

Yes, that's a bug, create an issue for it on YouTrack.

Can i modified this fun in something more sweet:

private fun processStickyEvents() {
        EventBus.getDefault().getStickyEvent(AccountsSelectEvent::class.java)?.let { onAccountsSelectEvent(it)  }
        EventBus.getDefault().getStickyEvent(CategoriesSelectEvent::class.java)?.let { onCategoriesSelectEvent(it)  }
        EventBus.getDefault().removeStickyEvent(AccountsSelectEvent::class.java)
        EventBus.getDefault().removeStickyEvent(CategoriesSelectEvent::class.java)
    }

mb something like this?

private fun processStickyEvents(Class.name, lambda) {

currently it looks something like

fun <T: Any> getStickyEvent(type: Class<T>): T?

you can make it reified

inline fun <reified T: Any> getStickyEvent(): T?

then you can use

T::class.java

as your replacement for the

type

argument you used before

@kevinmost @anthonycr here's what I came up with: lines being lines of text:

return lines.collect(CustomCollector)
                .flatMap { x -> process(x)}....

It uses a CustomCollector

object CustomCollector : Collector<String, MutableList<MutableList<String>>, MutableList<MutableList<String>>> {
    override fun accumulator(): BiConsumer<MutableList<MutableList<String>>, String> {
        return CustomBiConsumer() // main logic here, looks for a specific line, creates a new MutableList<String> and append it to the List of Lists, otherwise add non-empty lines to the last List of strings
    }

    override fun combiner(): BinaryOperator<MutableList<MutableList<String>>> {
        return CustomBinaryOperator() // combines 2 Mutable list of lists
    }

    override fun characteristics(): MutableSet<Collector.Characteristics> {
        return Collections.singleton(Collector.Characteristics.IDENTITY_FINISH) //the accumulator object is the same as the result object 
    }

    override fun supplier(): Supplier<MutableList<MutableList<String>>> {
        return ArrayListSupplier() //creates a new Muttable list of strings
    }

    override fun finisher(): Function<MutableList<MutableList<String>>, MutableList<MutableList<String>>> {
        return Function.identity() // noop 
    }

}

class CustomBinaryOperator : BinaryOperator<MutableList<MutableList<String>>> {
    override fun apply(t: MutableList<MutableList<String>>,
            u: MutableList<MutableList<String>>): MutableList<MutableList<String>> {
        t.addAll(u)
        return t
    }
}

class CustomBiConsumer : BiConsumer<MutableList<MutableList<String>>, String> {
    override fun accept(stringGroups: MutableList<MutableList<String>>, line: String) {
        if (line.isEmpty()) return
        if (line.matches(MacParser.NAME_REGEX)) {
            stringGroups.add(ArrayList())
        }

        stringGroups.last().add(line)
    }
}

class ArrayListSupplier : Supplier<MutableList<MutableList<String>>> {
    override fun get(): ArrayList<MutableList<String>> {
        return ArrayList()
    }
}

Has anybody tried 1.1.50 already? It doesn’t work for me 😞 Getting the following error when trying to run app from Intellij: java.lang.NoClassDefFoundError: Could not initialize class org.jetbrains.jps.incremental.BuilderRegistry$Holder Tried to disable incremental compilation, tried to invalidate caches, but in vain.

You can actually do this in Kotlin:

fun <T> castUnsafe(input: Any?) = input as T
// later:
thisMethodHasNonNullParameter(castUnsafe(null))

Will compile and fail at runtime with

IllegalArgumentException

thrown from

thisMethodHasNonNullParameter

.

I have several objects to reinterpreter memory:

interface reinterpreter<T> {
    operator fun get(index: Int): T
    operator fun set(index: Int, value: T): Any
}
object vec1bData : reinterpreter<Vec1b> {
    override operator fun get(index: Int) = Vec1b(data, index * Vec1b.size)
    override fun set(index: Int, value: Vec1b) = <http://value.to|value.to>(data, index * Vec1b.size)
}

but when I type

inline fun <reified T> data():reinterpreter<T> = when (T::class.java) {
        Vec1b::class.java -> vec1bData
}

I get:

required

reinterpeter<T>

, but found

vec1bData

Is there a

1.1.50

version of the Kotlin plugin and how do I get it? Idea is complaining about binary incompatibilities, and the auto updater doesn't see the update because the current version is

1.2-M2-release-IJ2017.2-1

and that's considered a higher version.

Is there a reason to use incremental compilation on CI, or is it pointless since it does a clean build every time? Is there a way to disable it (using Gradle)?

fun main(args: Array<String>) {
    for (mx in -100L..100) {
        println(mx)
    }
}

Does it crash compiler only for me on 1.1.50?

@mingkangpan What version of Kotlin are you on? I think this was fixed a while ago.

upgraded kotlin to 1.1.50-release-Studio3.0-1 getting this error :

Error:Could not find org.jetbrains.kotlin:kotlin-gradle-plugin:1.1.50-release-Studio3.0-1.
Searched in the following locations:
    file:/opt/android-studio-preview/gradle/m2repository/org/jetbrains/kotlin/kotlin-gradle-plugin/1.1.50-release-Studio3.0-1/kotlin-gradle-plugin-1.1.50-release-Studio3.0-1.pom
    file:/opt/android-studio-preview/gradle/m2repository/org/jetbrains/kotlin/kotlin-gradle-plugin/1.1.50-release-Studio3.0-1/kotlin-gradle-plugin-1.1.50-release-Studio3.0-1.jar
    <https://dl.google.com/dl/android/maven2/org/jetbrains/kotlin/kotlin-gradle-plugin/1.1.50-release-Studio3.0-1/kotlin-gradle-plugin-1.1.50-release-Studio3.0-1.pom>
    <https://dl.google.com/dl/android/maven2/org/jetbrains/kotlin/kotlin-gradle-plugin/1.1.50-release-Studio3.0-1/kotlin-gradle-plugin-1.1.50-release-Studio3.0-1.jar>
    <https://jcenter.bintray.com/org/jetbrains/kotlin/kotlin-gradle-plugin/1.1.50-release-Studio3.0-1/kotlin-gradle-plugin-1.1.50-release-Studio3.0-1.pom>
    <https://jcenter.bintray.com/org/jetbrains/kotlin/kotlin-gradle-plugin/1.1.50-release-Studio3.0-1/kotlin-gradle-plugin-1.1.50-release-Studio3.0-1.jar>
Required by:
    project :

has anyone ever hit

Error:Kotlin: [Internal Error] java.lang.RuntimeException: Error generating class file gli_/coreTexture1d$5.class (compiled from [C:\Users\elect\IdeaProjects\gli\src\test\kotlin\gli_\coreTexture1d.kt]): Method code too large!

? Coz I don't think it is too large..

Hey, fellow developers! This week I wanted to create a small tutorial about getting started with Kotlin and it ended up being the size of e-book. It is about Kotlin and how to get started with kotlin. It features setting up of all the dependencies, learning how to create new kotlin project in IntelliJ and building a few features for the command-line application. The tutorial itself is targeted at beginner programmers, but I would love to get some input from more experienced developers too. Here is the link: https://iwillteachyoukotlin.com And the tutorial has a projected trajectory at the end so that I can continue creating the content (implement more features for the app) in form of blog post (or a course) for the same website, including expanding on different platforms, such as Web development with Kotlin and Android development with Kotlin. As always, feedback is warmly welcome as well, as shares on social networks, hacker news, reddit, etc (in case you liked it 😉 ).