Is there a library that serializes data classes into compilable Kotlin code? Something like this:

Can annotations be added to parameters of a primary constructor? E.g can I convert this -

class AddressEntity(
        var address1: String?,
        var address2: String?,
        var city: String?,
        var country: String?,
        var postalCode: String?,
        var stateOrProvince: String?
) {...

to something like this -

class AddressEntity(
        @Property var address1: String?,
        @Property var address2: String?,
        @Property var city: String?,
        @Property var country: String?,
        @Property var postalCode: String?,
        @Property var stateOrProvince: String?
) {

An esoteric Kotlin feature I stumbled across: https://medium.com/@nwillc/kotlin-class-inherits-from-function-675c71e04ecb

Hi all, I am trying to do something and I want to check what would be a idiomatic way to do it: I will simplify the problem here: Let's say I have the following function

fun getSomeString(): String?

and I have a function that wraps a String (not String?) in some Response

fun getResponse(msg: String): Response

then I have a third function in which I need to return a Response and I am calling the getSomeString, if it returns a String I need to feed it to getResponse, but if it returns null I need to return some ErrorResponse object. Now, I wanted to make this a one liner, but I'm having problems with thinking how to do it It would be great if I could do something like this:

fun GetResponse: Response = 
  when(getSomeString()) {
    is String message -> getResponse(message)
    else -> ErrorResponse()
  }

but I can't do this is String message. In my real use-case this is not a String but a data class with a lot of fields, and I could match on all those fields and then recreate the object on the right side of -> but that just doesn't seem right. How would this usually be done in Kotlin? I am used to some other languages where this approach of naming the String would be done in is String message ->...

Hey everyone, I’m working on Alpas, a Kotlin-based web framework that is open source. I’d like to get help to reduce infrastructure costs and I can apply for assistance with DO if I have at least 100 stars on the GitHub repo. Would you be so kind as to give me an assist and star the repo? We are just 11 stars away and your support would be very appreciated! Thanks in advance! https://github.com/alpas/alpas

is this a compiler bug (1.3.72)? The objects in the map are the right type but it wants the type of the variable to be more defined?

hi , is there a tool to detect data-races , what : implementing a protocol for my company and it has weird behavior at present.

Hello everybody, I am new to Kotlin and this channel so I am not sure if it is the right place the post this: I am testing Kotlin Multiplatform. I want to create a function in androidMain with a argument which is an Activity. But it looks like kotlin does not recognise the type Activity.

fun foo(bar: Activity){}

Do I have to add anything in the build.gradle.kts? Thanks for your help.

hello, guys, I am new in kotlin development so happy to hear and to learn more and help others too.

Also can kotlin native run on micro-controller ⁉️

Hi. What will be the proper way to create an extension function for an Enum? I saw this question, but I’m not sure if it’s a correct approach to define a extension for an Enum. https://stackoverflow.com/q/35966447

What’s the best practice to pass member of the class to

object

private val processor = DeeplinkProcessor()

    object branchListener : Branch.BranchReferralInitListener {
        override fun onInitFinished(referringParams: JSONObject?, error: BranchError?) {
            processor.process(referringParams)
        }
    }

in that case, I can’t access

processor

from object

BranchReferralInitListener

Do any of you disagree with that statement? If so, could you enlighten me?

Hi folks! There is anyway to enforce type using generic? I'm using KPropertyT, V and I want to have a function that receives the

V

type only from the KProperty.

This message was deleted.

Does the Kotlin slack have a channel where people can discuss anything about Kotlin performance?

message has been deleted

Hi! Implementing a type safe unix timestamp. I want to make the constructor private (should only be initializable via factory methods) but the

value

used in it should be publicly readable:

@Parcelize
data class UnixTime private constructor(value: Long) : Parcelable {

    companion object {
        fun fromValue(value: Long): UnixTime =
            UnixTime(value)

        fun minTimestamp(): UnixTime =
            UnixTime(0)

        fun now(): UnixTime =
            UnixTime(Date().time / 1000)
    }
}

fun UnixTime.debugString() =
    "$value, ${toDate()}"

fun UnixTime.toDate() =
    Date(value * 1000)

This doesn't compile, and has also a warning in

private

. How do I implement it correctly?

Why is that a thing in Kotlin?

val url = "<https://google.com/>"
val rgxReplace = url.replace("/".toRegex(), "\\/")
val strReplace = url.replace("/", "\\/")
    
println(rgxReplace)  // outputs: <https://google.com/>
println(strReplace)  // outputs: https:\/\/google.com\/

Out of curiosity, why is this forbidden?

class Test(
  var test: Int,
    get = test++
    private set,
  val test2: Int
)

Is there any reason like a syntax ambiguity, or is it just because it's not ‘clean'?

It would also be nice if we could do document constructor properties with this kind of syntax as well:

class Test(
  /** Put the documentation comment here */
  val test: Int
)

Is it necessary to specify the type in this case:

var x = 10
var z: Long = x.toLong()
// or can I just write var z as:
var z = x.toLong()
// compiler should be able to infer the type, no?

I couldn’t find anything but is there a way to assign to itself in the constructor of a class ? For the sake of simplification let’s say I have

class Dog{
    val name:String
    val age:Int

    init { this = fetchDogFromSomewhere() }
}

fun fetchDogFromSomewhere():Dog{ 
   // Things
}

Is there some way to achieve this? Right now I’m using a companion method that calls fetchDogFromSomwhere

What IDE is best for Kotlin development? Intellij Ultimate 2020 is very slow and hogging a lot of cpu for me so thinking of alternatives now

Hello everyone, I'm Isaac from Lusaka, Zambia. I'm new to Kotlin programming I got into it some seven to eight months ago. I love the language and want to learn the best practices from experts here. I'm still learning the language. I've been also trying out Kotlin Android develop.

How am I supposed to do this??? This causes a compile time error and I need it for packet handling :c

After I made some changes to my gradle build some of the modules are now red in IDEA. How do I find out what the problem is ? (Messages tab is empty; Usually I could expand down to the problem but nothing is red below it)

Hi everyone. Is there any way to load variables from an external Kotlin Script file (.kts) when a Kotlin program is running. I wonder if there are any ways to replace .json/.ini/.yaml/… config format with .kts.

Hi everyone. I have a question about Kotlin Unsigned types, which are still marked as experimental language feature. Do you think they are feasible for use in a multiplatform Android/iOS project using shared module written Kotlin Native? Thanks.