what's the difference between stdlib and stdlib-jdk8?

@SpringBootApplication
class BlogApplication

fun main(args: Array<String>) {
  runApplication<BlogApplication>(*args)
}

what does the

*

do?

message has been deleted

Who drew this? It’s beautiful 😉

or rather, a type variable. it doesn't work today 😞

You mean

Array<String>::class.java

? Is that the same as

String[].class

?

In Java I can have unbound wildcard like

List<List<T> slideBy(Function<T, ?> classifier) {...

How do I do this in Kotlin. I tried

fun <T> slideBy(list: List<T>, function: (T) -> *): List<List<T>> = TODO()

but apparently that’s not legal. Should I do

fun <T> slideBy(list: List<T>, function: (T) -> Any?): List<List<T>> = TODO()

with the named arguments and default arguments, do you still use the pattern builder in Kotlin ?

Is there a preferred way of limiting parallelism with coroutines? I have a sequence (A) -> lookup function (B) -> aggregate results(C). I split A into chunks and I want step B to be run in parallel(more or less a blocking database call) at most X times. I've had success using a

newFixedThreadPoolContext

but that's deprecated. I've also tried a fixed sized channel, but I have to create the coroutines as async(start=LAZY) and then await them one by one if I do a fold or a map.

Fun issue where the Kotlin Compiler crashes when there are 65K+ characters in a

.gradle.kts

file. https://github.com/gradle/kotlin-dsl/issues/1305

yes, kotlin scripting can do that

@louiscad running commands as a extension function

Is the inline classes feature stable enough for production use?

Is there a good way to use

try/catch

in init blocks to initialize immutable (i.e.

val

) class properties? Right now I use

class Foo(val a: Int) {
val b: Int
init {
  var bb: Int
  try {
    bb = complicated(a)
  catch (e: Excepetion) {
    bb = fallback()
  }
  b = bb!!
}

Which is preferred?

Got lost in generics a bit. Is there any way to avoid unchecked cast here?

how do you avoid having to return null in java when the param is

(Something) -> Unit

?

Please, don't jump at me, but is there any progress on package protected visibility? 😒imple_smile: Or any other sort of more granular scoping than

internal

? I really believe it was a mistake not having it.

Please remind me about the following: If I declare a Long in my class, say

var f: Long = 5

, and in the course of my program, the value changes. And then I would like this check:

if (f == 10000) { ... }

. Why is it that it doesn't compile? Why do I need to supply an L to the hard-coded constant

10000

here? Shouldn't it be possible for the compiler to detect that

10000

is valid as a Long value?

Lookig at some old Kotlin code, I notice it was possible to write collection extensions infix style. Is there any reason this was removed ?

readfile

if there a proper “style” of where companion objects should go in a file? at the beginning? at the end?…maybe a dumb question…

A little while ago, I wrote some CoroutineNetworkChannel implementations. I was wondering if there was any value to adding these to the main kotlin distribution, and how one would go about that? https://github.com/ConsenSys/cava/tree/master/net-coroutines/src/main/kotlin/net/consensys/cava/net/coroutines

is string interpolation performed at runtime or compile-time?

At first the

()

operator seems straightforward, but the more I think about it, the more confused I am: https://stackoverflow.com/q/54045644/1772342

In Intellij in Java I can easily get the IDE to generate a load of methods on a class that delegate down to an injected instance of a class. Kotlin supports delegation as part of the language but only for interfaces. What's the best way to generate delegates for classes that don't implement an interface?

For example annotate a field for apply some kind of data validation, it’s a good thing?

I've just converted a load of unit tests in src/java/package name to Kotlin, I've actually now got no Java unit tests at all, so it seems odd having a java source directory with just Kotlin source in. Do people bother renaming it ?