Is there a way in Kotlin to access a type name at compile time, to use it somewhere else at compile time?

…or provide a literal as part of a generics type list that can be used in a function name?

Hello! While developing Kotlin compiler plugin, I found that PropertyDescriptor.compileTimeInitializer is null if this descriptor is belong to another module. For example case: val test : Int = 1. If it is checked in the same module compileTimeInitializer is not null. Is it a bug or expected behaviour? If it is expected, how can i get this information correctly?

when using java streams from kotlin, how can I make it non-nullable

thanks, and sorry for being a jerk 😞

no stress, I know what it's like when you're pushing uphill with something that keeps fighting you. hope it all goes well

this is truly the greatest community ever. somehow i just start ranting about a different language, and someone comes to my rescue with reassurance and tips.

also i wish more languages had the implicit

it

for anonymous functions

clojure does with #(print %) and #(+ %1 %2)

neat

Is it exactly bad to use inline for many things?

I'm one of the commiters of #kotlintest and I usually find myself resolving many issues using inline functions. Can it bite me in the future?

Hey guys, I am trying to use CsvCustomBindByName annotation of opencsv library, but Intellij marks it red with message “an annotation argument must be a compile-time constant” error by Intellij, while it successfully compiles, but gives the following runtime error: java.lang.annotation.IncompleteAnnotationException: com.opencsv.bean.CsvCustomBindByName missing element converter My code is this: class Test{ @CsvCustomBindByName(column = “DT”, converter = LocalDateConverter::class.java) var dt: LocalDate? = null } Any ideas?

What is the compact syntax for local variables that can’t be null while also printing a message when they are? An example that works, without printing:

fun myMethod(): String? {
    val foo = myOptional ?: return null
}

Now I want something like this

fun myMethod(): String? {
    val foo = myOptional ?: {
        println("myOptional is null")
        return null
    }
}

will that exit the function?

val foo = myOptional ?: println("myOptional").let { null }

If you put

return null

in it, sure.

oh great, interesting

I thought that would return only in the closure… or something like that

ah yeah go with Karel if you want to exit the mymethod function

Or it might be clearer to just write out the if and use smartcasting.

or just for fun

val foo = myOptional ?: return null.also { println("it is null") }

that seems actually a bit clearer

Hello guys, let me ask you something. Can we dynamically create a companion object from a map? For example, if we have a map with a hundred of keys and values, can we create a companion object so we could use it like the following?

println(MyClass.myMapKey1)
println(MyClass.myMapKey2)
...
println(MyClass.myMapKeyN)

Maybe somehow a way to eval a code? Or another technique? (I would like to use this with kotlin-dsl.) My motivation is that I would like to retrieve a map from a properties file (a yaml one), but if possible, I would like to access my keys like if I was using an enum. Since the nature of this properties could be dynamic and they could change, it’s not a good idea to use a enum or a class with a defined companion object. We could access this keys as usual

myMap["myMapKey1"], ..., myMap["myMapKeyN"]

but I would like to avoid typos and use it like an enum, improving the experience with autocompletion. Can we achieve something like that?

I was hoping that bar could either take a suspend function or a non-suspend function

(instead of doing the latter)

you can work around this with inlining

delay is suspending so the lambda passed to bar is suspending (or appears to be due to the inlining)