Yeah, that's how I got it 🙂

hi, is there any way to initialize a immutable property in a data class in the constructor? In non-data class I've seen examples for the

lazy

keyword that might can help for me, but I don't know how I could use it in a data class. I want something like in C++ how we define a

const

instance variable in the constructor. Here is an example what I would like to do:

data class MyClass(val property: String) {   # <-- mutable
	init {
		this.property = property.capitalize()
	}
}

instance = MyClass("test")
instance.property # Test
instance.property = "test2" # error, immutable variable

but unfortunately the compiler says

Val cannot be reassigned

when I set

this.property

. Do you know how I could use immutable instance variable here?

Is there a canonical library to use for XML parsing in Kotlin?

it would be a fancy feature though, default types

Does anyone know why this is still an issue in Kotlin latest version? https://youtrack.jetbrains.com/issue/KT-3212

sadly - no. idea i need it to generate bytecode for

object : TypeOf<ArrayList<CityInfo>>() {}

class to allow gson to deserialize, so it means i need declare class exactly, any templates return type as T (not as ArrayList<CityInfo>)

Is anyone could help with this: How to write an extensions function if data class is defined in .kt file, not in kotlin separate class

fun CustomerInfo.addRandomPartToName(): CustomerInfo {
    val oldItem = this.customerInfo <<<< `this` is not usable
    val newItem = oldItem?.copy(name = oldItem.name + RandomStringUtils.randomAlphabetic(7))
    return this.copy(customerInfo = newItem)
}

Hi, does anyone knows how to count

object

,

enum

and other Kotlin keywords if possible in a project? I'm looking for an OS agnostic way to count them if possible as I work on macOS and Windows 10

anyone use spring-data ( specifications ), please share your best practice for me ?

is it possible to have a default value of type parameters in generics?

untested and i'm not familiar with Kovenant either, but this should probably work

fun <T> Deferred<Unit,T>.resolve() = resolve(Unit)

@orangy @ilya.gorbunov Can tell why this example provided in the docs throwing exception on try.kotlinlang.org but works fine in the IDE

inline fun <reified T> membersOf() = T::class.members

fun main(s: Array<String>) {
    println(membersOf<StringBuilder>().joinToString("\n"))
}

https://try.kotlinlang.org/#/UserProjects/e8imtmr1ecig3054eh01oekq8q/s05q8o8o76i5jkum3ov36o3gpc

Hi! kotlin.sequences package has a flatten method (https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.sequences/flatten.html). But it works only on a sequence of sequences (Sequence<Sequence<T>>). Are there any alternatives that will work on any sequence (Sequence<T>)? Something that behaves more like a flatten function in Clojure.

I'm getting some pretty poor behavior out of IntelliJ these days, I'm using a lot of fringe stuff so I'm assuming it's just a bunch of bugs around the edges. What's the best way to go about reporting them? Just post to your youtrack?

just wondering is there a similar chat channel for Java ?

Are the talks from kotlinconf already available online?

Welcome onboard @Hunter. Does Honeypot use Kotlin?

why is “this cast can never succeed” a warning and not an error?

This message was deleted.

Hey guys I'm pretty new to Kotlin. Can anyone guide me some tutorials on Kotlin with Android.

does

@Throws

serve a purpose other than java interop?

I think that can just be

return lines.joinToString(separator = if (newLine) separator else "")

FYI: http://mockk.io/

Hi, do you accept contributions? Would love to add some samples regarding the use of the JavaExec plugin and defining additional Source Sets

btw I think #kotlin should have very strong focus on testing tools, so that it's easy for Java dev to try it and benefit from having DSLs for testing. So it should be really Kotlin frameworks, no such stuff like "final" issue(kotlin really can allow to run tests with special option, not plugin), e.t.c. up to the approach when you counting clicks till writing first tests for existing Java/Maven/gradle project

if you provide a body for an

abstract

member, that's used as the default if an implementation doesn't override it

Hi, is anyone facing this problem.

break or continue jump across class boundary kotlin

this problem appears when i am going to use break or continue. inside lamda with receiver i create ‘letIn’

lamda with receiver code
fun letIn(componentName: String?, values: List<LifeService.Value?>?,
          body: (String, List<LifeService.Value?>) -> Unit) {
    if (!TextUtils.isEmpty(componentName) && (values != null && values.isNotEmpty())) {
        body(componentName!!, values)
    }
}

this sample code for it.

for (option in 0 until optionsSize) {
val component = optionsGroup?.options?.get(option)
        component?.let {
            with(component) {
                letIn(presentation, values, { componentName, values ->
                    if (componentName == LifeComponentViewType.CHECKBOX) {
                        letIn(transformCheckBoxValues(optionsGroup), { data ->
                            dataSource?.push(componentName, ComponentDataCheckBoxCollection(name, data))
                            view.buildComponent(componentName)
                            // break or return doesnt work
                        })
                    } else {
                        dataSource?.push(componentName, ComponentDataCollection(name, values))
                        view.buildComponent(componentName)
                    }
                })
            }
        }
}

because above code didnt work so i use imperative way.

for (option in 0 until optionsSize) {
            val component = optionsGroup?.options?.get(option)
            if (component != null) {
                val presentation: String? = component.presentation
                val values = component.values
                if (!TextUtils.isEmpty(presentation)) {
                    if (presentation == LifeComponentViewType.CHECKBOX) {
                        val data = transformCheckBoxValues(optionsGroup)
                        if (data.isNotEmpty()) {
                            dataSource?.push(presentation, ComponentDataCheckBoxCollection(optionsGroup.name, data))
                            view.buildComponent(presentation)
                            return
                        }
                    } else {
                        dataSource?.push(presentation!!, ComponentDataCollection(component.name, values))
                        view.buildComponent(presentation!!)
                    }
                } else {
                    return
                }
            }
        }

does anyone have suggestions?

interestingly, it's much easier to do it using an extension function on the interface:

fun <T: Foo> T.common() = this

@dragas Can you show the whole file?