And another question. Trying out to debug my question above in a scratch file, I got the same output for 2 different digest instances, with different data. What am I missing?

val digest = MessageDigest.getInstance("SHA-256")
digest.update("bar".toByteArray())
val str = digest.digest().toString(UTF_8)

val digest2 = MessageDigest.getInstance("SHA-256")
digest2.update("sldkjfskfjs".toByteArray())
val str2 = digest2.digest().toString(UTF_8)

// str == str2 --> true!

why would this error message come up? anyway to disable with intellij ce? Normally kotlin works fine but i'm trying to write aws lambda function with kotlin. Using sam/gradle kotlin dsl.

Hey guys, not sure where to put it. What are the best place to find remote contract jobs (3 - 12 month jobs) as Kotlin/Android dev?

I have a below list val list = listOf("o=one", "t=two", "t=two", "f=four", "o=one", "t=two", "s=seven", "o=one") I wanna split it into list of the list contains [["o=one", "t=two", "t=two", "f=four"],["o=one", "t=two", "s=seven"],["o=one"]] Actually I want to group list by "o=" delimiter and the list will always have at least one "o=" value. How could I achieve this in Kotlin without creating mutable temp variables because of my code should be in the functional style? I have tried with group() and groupBy{} methods but couldn't get the expected result.

Kotlin introduces itself as supporting functional programming but it inherited the poor typing system of Java! For instance if you try to do

Pair(a,b) as? Pair<String, Boolean>

where

a

or

b

can be null, there is a Java warning that says

Unchecked cast: Pair<String?, Boolean?> to Pair<String, Boolean>

. By supporting more strong typing system which supports generics type checking, we can make sure we're developing less buggy programs. I want to know is it possible to do so? For instance, why we cannot hold type info in the KClass in the runtime to check these kind of stuff? Thank you.

Is there any list of accepted (or at least very possible) upcoming features in Kotlin 1.4?

Is there a way to refer to shadowed top-level declarations explicitly? E.g. to call a top-level function from a method of an object in the same package that shadows that top-level function?

Anyone know if kotlinx.serialization exposes a streaming serialization API? I see internally it uses one but looks like it's internal. Basically I'd like to go object -> steam w/o a String in the middle.

Seems like every time I update IDEA to new version I get less performance, simple change takes several minutes to compile and and minute more until tests starts running. It seems that new features are keeping added and performance decreases, anyone else struggling with this?

hi, is there a way to specify multiple targets for one annotation? instead of using two annotations @field:JsonProperty("some") @get:JsonProperty("some")

is it possible that in some cases kotlin generates methods that are not marked as synthetic, and have no associated source file? I’m using pitest for my project and pitest needs source files for all non synthetic methods (which makes sense imo) this is how the class looks in “show kotlin bytecode”: https://gist.github.com/christophsturm/1f46f14dde1a61a14ce449b0632f883c

Hi there, What is the idiomatic Kotlin way to expose a

var

as a read-only property. I need something like the following:

class Something(...) {
var counter_ = 0

fun doSomething() { 
(snip)
counter_++
(snip)
}

val counter: Int get() = counter

Is there a better way?

Published my first article that tackles creating Design Systems to be used between Android, iOS, & Designers. Included are free projects for both platforms! https://uxplanet.org/the-one-system-every-best-in-class-digital-product-shares-e94f85a491d6

stupid question, if I define

targetCompatiblity

in my build.gradle to be 8 but do not define

kotlinOptions.jvmTarget

to be 1.8, so it should be 1.6 per default, what is the compiler supposed to generate? I am asking because I came across

java.util.function.Consumer

in the resulting byte code and this one was introduced in 1.8

probably wrong but something like:

fun performRequest<T>(request: ApiMessage<T>)
At a guess..??

Was there a Multiplatform channel?

Hello, what’s the closest we can get to have a functionality like

guard

in Swift? The best we found for now is to implement a few functions of that sort:

fun <A : Any, B : Any> guard(a: A?, b: B?, block: (A, B) -> Unit): Boolean {
    return if (a != null && b != null ) {
        block(a, b)
        true
    } else {
        false
    }
}

This allows us to run code on a few different types and check that the block ran to have an

else

part. What do you think? It there something better out there? I checked Contracts but you can’t imply a list doesn’t contain a

null

item, too bad.

I want to loop over the elements of a queue, and remove them in the process. is there a fancy way to achieve this with

for (x in y)

or do i have to remove them manually ?

I've problems writing a test implementation for an interface:

interface Preferences {
    // ...
    fun <T> putObject(key: PreferencesKey, model: T?)
    fun <T> getObject(key: PreferencesKey, clazz: Class<T>): T?
}

Force returning a specific object, for unit testing

class PreferencesReturningObject<T>(val obj: T): Preferences {
    override fun <T> putObject(key: PreferencesKey, model: T?) {}
    override fun <T> getObject(key: PreferencesKey, clazz: Class<T>): T? = obj
}

How can I write this? (Without using Mockito or similar) Edit: It's "fixed" by writing

obj as T

(the class type parameter actually doesn't make sense, it can be just

Any

) but wonder if there's a better way

Does any one can help me solving out this problem

hello. is there a damn place where a humble developer can rant about monads being better than coroutines? please, help me to a banter room.

Hey guys, Inside the

Primitives.kt

file, Inside the Int primitive, there are methods to convert the Int to other primitives but I don't see any implementation. I can't figure out how this conversion works. What am I missing?

These are the methods

is there a shorthand to access an optional throwing an exception if it's not set?

I'm liking the new timeAPI for Monotonic and TestTime. TimeMark is pretty awesome for most things where I mark time from a point. Only one slight issue. I have one place where I get a time given to me as a ZonedDateTime(instead of assuming now). Is there a way given a Clock and a ZonedDateTime to create a TimeMark?

Hi, is there a way to include the test classes of one subproject into another subproject so it can use them in its tests? I can't find a way to do this that works with my setup (I'm using the android plugin and multiplatform, and not the java plugin). (edited)

Hello! Does anybody know how to declare get() & set() for delegated properties correctly ? I'v tried like this and it haven't worked out.

operator fun getValue(thisRef: Any, property: KProperty<*>): Any = properties[property.name]
        ?: throw IllegalStateException("Property ${property.name} hasn't been initialized!")

operator fun setValue(thisRef: Any, property: KProperty<*>, value: Any) {
    properties[property.name] = value
    listeners[property.name]?.invoke(value.toString())
}

I'm new to functional programming and I'm using Kotlin with arrow functional library. I would like to convert below function to pure. Each 

func*()

 call returns a valid string and it's gets appended to the mutable string variable 

returnString

. As far as I know, FP functions should not use any mutable values. So how would I replace those string appending lines?

private fun stringifyValue(): String {
            var returnString = String()
            returnString = returnString.plus("=")
            returnString = returnString.plus(func1())
            returnString = returnString.plus("+/")
            returnString = returnString.plus(func2())
            returnString = returnString.plus("@")
            returnString = returnString.plus(func3())
            returnString = returnString.plus("#")
            returnString = returnString.plus(func4())
            returnString = returnString.plus("%")
            returnString = returnString.plus(func5())
            returnString = returnString.plus("^")
            return returnString
}

I'm looking for a way to make this more idiomatic. It's not the best solution, but it works at the moment. I'm looking to learn more about collection transformations and how I could possibly do this with built in Kotlin functions. Can anyone point me in the direction on maybe what functions (map, etc) I should be looking into? Thank you!

fun main() {

    val list = """
        a,234,97654/
        b,23,ABC,
        b,44235,203
        a,234,97654/
        b,23,ABC
        b,44235,203
        49,234
        39,9291
    """.trimIndent().split("\n")

    var total = mutableListOf<String>()

    for ((index, value) in list.withIndex()){

        var sb = StringBuilder()

        var nextIndex = index

        if(value.startsWith("a") && value.endsWith("/")) {
            sb.append(value)

            while(list[nextIndex + 1].startsWith("b")) {
                sb.append(list[nextIndex + 1])
                nextIndex++
            }

            total.add(sb.toString())
        }
    }
}

Hi kotliners, I’m going to model permission rules. Nothing difficult per-se but since the “source of truth” is a spreadheet with rows “object status” and columns “user role” and cells “grant/deny” I was wondering if I should build a representation close to this so it is easier to visually compare with that spreadsheet source of truth. Anything better suited in kotlin than having and array of arrays for this? It is all static and only a 5x8 table.