Hey guys, I was embarrassed to ask last night because of the really complicated structure but I'm just going to ask anyway: I thought you could loop through a HashMap with

forEach

but -

Why would everything within be unable to execute?

here's my sanity check, but I'm starting to think that it's either an issue with string building or an issue with the structures themselves https://www.mkyong.com/kotlin/kotlin-how-to-loop-a-map/

That looks like a compiler or debugger bug to me.

is slack like discord?

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I tried to introduce some Kotlin into our Java project but not all my coworkers are on IntelliJ. They use VS Code (and some Eclipse...) which it seems does not work well with dual Kotlin+Java projects. Is IntelliJ the only IDE that can do this?

We were having some internal debate about whether internal library APIs should use varargs and the *spread operator. Usage of the spread operator is flagged w/ a lint warning for being inefficient...but then there's an issue that it's no longer that inefficient. Search in this slack didn't pick up much on best practices either. Do folks just avoid using this in APIs or do you use Lists or other collections to pass a variable number of parameters? detekt rule for reference: https://arturbosch.github.io/detekt/performance.html

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Hi, Its known that

kotlin.Result

can't be used as return type for functions, unless used with the compiler flag

-Xallow-result-return-type

. So

fun parseInt(s: String) = runCatching { s.toInt() }

will not compile. But what I find weird is that it can be used in function literals, as follow:

val parseInt:(String)->Result<Int> = {n-> runCatching{n.toInt()}}

or:

val parseInt: (String)->Result<Int> = fun(n) = runCatching{n.toInt()}

The last two will compile correctly without using the compiler flag! Why and what's the difference? doesn't the same problem (i.e: future breaking changes) apply for both? or I'm missing something?

Hi!, new here, just checking in, android dev who wishes to dig a bit more on kotlin native…. cheers

Can I runtime-check if the generated KSerializer of a class is polymorphic (= it will emit a type descriptor)? I need this to properly generate typescript .d.ts files which must contain a “type” property.

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Any news on a prototype for the decorator system that @elizarov spoke about? I'd really like to play around with it a bit

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