What happens if you paste it in idea?

Honestly, I think that is one of the few bad decisions in Kotlin. Everything is an expression, but not this, because of one obscure bug that IntelliJ will happily warn you about.

Hi Guys! is there a more clean-kotlin-way to write this code:

if (v1 == null && v2 == null) {
            return 0
        }
        if (v1 != null && v2 == null) {
            return 1
        }
        if (v1 == null && v2 != null) {
            return -1
        }

I keep getting

Exception in thread "main" java.lang.IllegalArgumentException

on

@JvmField

fields

how is property ambiguity resolved? Cant find any info on that

Do you have a

public void setWebSite()

method?

Try

var members: MutableList<User>? = null

Can someone help me with kotlinjs? I am trying to follow this tutorial here https://kotlinlang.org/docs/tutorials/javascript/getting-started-idea/getting-started-with-intellij-idea.html i am not getting an "out" folder like it is shown in the example so i am getting a 404 in my browser

Another weird thing I can not reproduce: it worked once to compile from cmd line, I cleaned before, ran "mvn compile" got success, cleaned again, ran compile and it failed. The code itself wasn't changed. Kinda clueless right now

I got these warnings with Kotlin + Proguard:

Warning: kotlin.internal.JRE8PlatformImplementations: can't find referenced method 'int start(java.lang.String)' in library class java.util.regex.Matcher
Warning: kotlin.internal.JRE8PlatformImplementations: can't find referenced method 'int end(java.lang.String)' in library class java.util.regex.Matcher
Warning: kotlin.internal.JRE8PlatformImplementations: can't find referenced method 'java.lang.String group(java.lang.String)' in library class java.util.regex.Matcher

It seems that this proguard instruction doesn't help:

-keep class java.util.regex.Matcher { *; }

Hi Guys! Quick question why

this.javaClass.kotlin

returns

KClass<T>

where

this::class

returns

KClass<out T>

I am asking because I can do that:

this.javaClass.kotlin.memberProperties.find{ it.name == "test" }!!.get(this)

but I cannot do that:

this::class.memberProperties.find{ it.name == "test" }!!.get(this)
        //ErrorKotlin: Out-projected type 'KProperty1<out T, Any?>' prohibits the use of 'public abstract fun get(receiver: T): R defined in kotlin.reflect.KProperty1'

And I want to understand it

Hey guys, what best blog kotlin for to begin?

To fix this method just replace the

Any

with

T

.

@karelpeeters btw ended up just changing my interface into an abstract class so that i could make

internal fun toType(): T

Hmm. Maybe I messed up the generics. I will try it again

Ok. Thanks.

I'm just getting started with kotlin...can anyone expain what the

with

clause does? Is it similar to python's with?

it short circuits on the first option. is as expected

“Kotlin Data Class — My Love at First Sight with Kotlin.” https://medium.com/@erluxman/kotlin-data-class-my-love-at-first-sight-with-kotlin-a83ee8b01670

So that everybody knows: there is a special channel #feed for links to kotlin-related articles. Join it and get new :kotlin: goodness every day! Respectively, if you have wrote a kotlin article, please post a link to it to #feed. Note that #feed is strictly for posting links, any discussion is prohibited there and must be held in other channels.

Hello, does it make sense to add functions to a data class?

So what I had to do was:

func MyFunction() : String {
   var myReturnVariable : String //Can't seem to get this to be a val
   callTo3rdPartyFunction {
     //Do things
     myReturnVariable = "hello!"
   }
   return myReturnVariable
}

do you use an ide?

I’m getting

NAME

has private acceess

does that return a map? groupBy?

For example inside an inner class of

A

, I can use

A.this

shouldn't this work?

String.format("#%02X%02X%02X%02X", *i)

Kotlin does not (yet) generate Java 8 default methods.