chatting with people about nullable types makes everything sound like a question. “hey whats the return type?” “String?” “Well I’m asking you…”

String

? vs

String?

yeah i know

This is still a problem in Telegram because

String

? and

String?

look the same there

or if you chat with people who don’t notice the difference between

String

? and

String?

practicality aside I think there was a great opportunity for using interrobangs (

‽

) for what is now

!!

🙂

yes but where is that on a standard US english keyboard

unless you are talking doing it automatically with a font ligature like FiraCode does

Why can’t I pass null for T even though it has Any? as upper bound?

Screenshot 2018-11-06 at 8.15.15 PM.png

This works just fine though

https://twitter.com/kotlin/status/1059846511289397248 New experimental feature in Kotlin 1.3: Unsigned integers. Use the “u” or “uL” suffix to declare an unsigned literal, or convert from a signed number using toUByte, toUShort, toUInit and toULong. https://t.co/C73mUSmshi https://t.co/6hhzjjO0J5 Twitter

https://twitter.com/kotlin/status/1059864100946231296 Did you know you that you can download the Kotlin Reference as a PDF for offline viewing? 362 pages of docs! Just click on the Full Kotlin Reference link https://t.co/mc37pnkdn5 Twitter

I'm interested in checking out Kotlin coroutines as a replacement for the Reactor code I now use to do async calls to backend services to aggregate and transform data, which is a very common use case for me. Can anyone point me to an example coroutines app that does something like this for inspiration?

You mean,

logger

is

lateinit

?

is there a shortcut for repeating characters to form a string?

i know there's String.repeat

You can just use the java.nio classes AFAIK.

A quick question that is more Intellij than pure Kotlin, but maybe there's a simple solution with the intents and deprecation things in Kotlin. My app is slowly migrating to Kotlin but sill have a lot of Java (even if the 50% Kotlin is passed now :)) I have some singleton that I've migrated to objects and to simplify the migration I've kept things like

@JvmStatic
    fun getInstance(): XXX = this

I'd like to know if there's a way to add a deprecation or warning or anything to find the calls to getInstance() from Kotlin (But of course not in Java files)

No: https://kotlinlang.org/docs/reference/sealed-classes.html

A sealed class can have subclasses, but all of them must be declared in the same file as the sealed class itself.

https://twitter.com/kotlin/status/1060234198815031296 kotlinx.serialization is Kotlin’s solution for data serialization. It supports JSON, CBOR and Protobuf, works on JVM, JS and Native, and is powered by a compiler plugin (so it doesn’t use reflection). https://t.co/bhMyf3dIWW Twitter

Is there any example of how to launch JMH under kotlin+gradle? I always get an issue

ERROR: Unable to find the resource: /META-INF/BenchmarkList

I think I'm tryign to do something weird with regards to sealed classes

this obviously doesn't compile, but I'm trying to define a proper hierarchy here

a message will always have an id, a type, and a channel

so I thought I could use this in that way, but that doesn't seem to be the case

should I create a

BaseMessage

and then extend that instead?

the constructor inheritance isn't quite working like I'd want

sealed class Message(val id: Long, val type: String, val channel: String)
    
    data class Typing(val typingId: Long, val typingChannel: String) : Message(typingId, "typing", typingChannel)

Does not work either, because the constructor is private

so I'm sure I'm thinking about this wrong, just not sure how to orient myself the right way