But that doesn't work for variables and for classes it exposes the generic parameter which I don't really want.

I mean maybe I will use some libraries in coroutines, but these libraries may contain

Thread.sleep

as far, as I understand, in general, some Kotlin code would be untransferable to a different compiler backend, if it uses any Java library or anything JVM-specific, right?

Hi, is it some known issue or problem of mine that if you have too many nested lambdas, proguard fails? My code is something like this

with(layout) {
    viewmodel.observeData()
        .subscribe {
            myField.setDataWithCallback(it, {
                viewmodel.onFieldChanged(it)
            })
    }
}

and proguard fails on

Warning: com.example.calculator.CalculatorFragment$onViewCreated$1$4$1: can't find referenced class com.example.calculator.CalculatorFragment$onViewCreated$1$4

It happened to me before and i solved that by refactoring my code to multiple methods but still, I dont think its necessary here

New Kotlin Discord channel with many voice and text sub-rooms for people to use for collaboration, help with problems or whatever else. *There is a separate channel for advertising books and courses so don't spam other rooms or those posts will be deleted. We hope to see you there! https://discord.gg/8AAfda3

Nullable reference types in C# https://blogs.msdn.microsoft.com/dotnet/2017/11/15/nullable-reference-types-in-csharp/ Shame they don’t mention Kotlin in the article

That moment when you're going back and forth between Kotlin and Java code and spend 10 seconds staring at it wondering why the IDE is complaining that it

Cannot resolve symbol 'val'

, only to realize you're in a Java class.

Hello i am trying to get kotlin koans to work but i keep getting this error all the time after importing the gradle project

Error:Could not initialize class org.jetbrains.kotlin.gradle.KotlinGradleModelBuilder

does anyone have a sugesstion on how to solve this?

I read on SO and converted to this

while (`in`!!.readLine() != null) {
                line = `in`!!.readLine()
                outputText += line
            }

The former extends the latter with support for Java 7 specific stuff (e.g.

AutoCloseable

).

I have a Gradle (Kotlin) project & latest IDEA EAP. How can I easily switch from Groovy build.gradle to Kotlin build.gradle? Can I simply accomplish this with "New Gradle Kotlin DSL Build Script" and will it automatically become default for the project? Also, should I type extension for the filename? I'm a bit hesitant trying, because I tried around a month-two ago, and I recall screwing up something with this...

Is there a problem with the signup for this slack? Had a report that someone is trying to sign up, but it requires a jetbrains.com email address...

If I define in Kotlin List<Int> in java is expecting List<? extends Integer>, what's the way of maintaining compatibility?

What's the best library for Websockets (client side, using JVM) ?

tyrus is the RI at the least

@ziad using

String#hashCode

for this is a really bad idea

I'm looking to identify the term for something, what do you call it in kotlin when you invoke a method through the class while passing the

this

argument explicitly as in

(String::take)("hello", 3)

or even, what you call the

String::take

part?

If I have a function that takes a SAM with one argument as a parameter, and I have a function with one argument that I want to pass to it, I can use a function reference. But if that function takes 2 arguments, and the second has a default value, I can't. Are there any plans to address that in the future?

I dont know java but trying to make a simple app using kotlin....😁 please experienced people ........ How to display a local HTML file in webview with kotlin ........ Thank u

It there a convenient way to split a list of items into many smaller list of n items? e.g. a list of 100 items into 5 list of 20 items

I need to proofread English documentation. Anybody wishing to contribute?

I wonder how I can validate an entity in its properties both via constructor and setter without duplicating code. More formally, how do you get around with aggregate invariants (DDD). For example:

class Person(email: String) {
    var email: String = email
    set(value) {
        require(value.trim().isNotEmpty(), { "The email cannot be blank" })
        field = value
    }

    init {
        require(email.trim().isNotEmpty(), { "The email cannot be blank" })
    }
}

I tried with Delegation but feels a little bit complex since I would need to have NotEmptyString , NotEmptyCollection, or any kind of validation. Also I want to avoid those extra objects per property.

I have a question regarding the used regex engine in WebStorm/ PHPStorm

Hello, I'm newbie in Kotlin and have one question. Can I crosscompile from Linux to Windows?

These being the two methods?

Can KCallable be interchanged with Callable? I need to pass in a method reference to a Java method that uses Callable as a parameter but it seems as though that the kotlin function references aren't the same as Java, and they only work with KCallable. I tried to cast KCallable to Callable but I ended up getting a casting exception saying that they can't be casted properly. Is there some way to do this safely? Or is there a way to pass in a java method reference in kotlin?