Why do breakpoints in suspend functions not work? Is that not supported? Or is it just behaving weird here?

Can I get an example of a practical world use of: https://jorgecastillo.dev/kotlin-sam-conversions

hey, does anyone know what else you are supposed to do other than adding

kotlin.explicitApi()

to get explicit API mode enabled?

Hey 👋. Did I understand it correctly that with Kotlin

1.4.0

the explicit

kotlin-reflect

dependency is not needed anymore (in some situations?) as it's included in the standard runtime library?

I'm having this weird error when using delegated properties in Kotlin 1.4, any idea what is causing it?

Caused by: java.lang.NoSuchMethodError: kotlin.jvm.internal.FunctionReferenceImpl.<init>(ILjava/lang/Class;Ljava/lang/String;Ljava/lang/String;I)V

I am having an upgrade issue as well

inspection.evaluations.map(::adapt)

fun adapt(evaluation: Evaluation) : EvaluationRepresentationApi

compiles with 1.3, but does not in 1.4 .

inspection.evaluations.map { adapt(it) }

fixes it, but wanted to check if there is a different solution. to be more precise, gradle has no problem, it is idea that complains and fails compilation false, both complain

Hey 👋 After migrating to Kotlin 1.4 we are getting the following error when using

flatMap()

.

e: ../SomeClass.kt: Cannot choose among the following candidates without completing type inference: 
public inline fun <T, R> Iterable<String!>.flatMap(transform: (String!) -> Iterable<???>): List<???> defined in kotlin.collections
public inline fun <T, R> Iterable<String!>.flatMap(transform: (String!) -> Sequence<???>): List<???> defined in kotlin.collections
e: ../SomeClass.kt: (158, 49): Unresolved reference: it

And the code to repro this issue

fun createStrings(strs: String): List<String> {
    return emptyList<String>()
}
...
emptyList<String>().flatMap { createStrings(it) }

Anyone managed to fix this?

Hey anyone please suggest any alternatives to xcode for windows or linux?

Why can't I pass anonymous functions and function references as

suspend (...) -> ...

?

When I add

compile "org.jetbrains.kotlin:kotlin-reflect:${versions.kotlin_version}"

(kotlin 1.4.0), it appears it doesn't fully include the reflection as methods like

primaryConstructor

and

declaredMemberProperties

can't be found. Am I doing something wrong? My jar size increases by 2mb though 🤔

Anyone know what this crazy message means? I'm trying to upgrade to 1.4 but I keep failing on various packages. Thanks!

Does anyone know where I can see the source for the primitive types such as

Int

? I’m interested in seeing how mapping to

int

, and boxing to

java.lang.Integer

is implemented. So far I found a Generator class: https://github.com/JetBrains/kotlin/blob/master/generators/builtins/primitives.kt And this native generated file, but I can’t see an equivalent for JVM or where the conversion is handled.

Continuing my question from yesterday, I'm still unable to mock (using mockito-kotlin) a call to a java service that takes in varargs. It always returns null.

private String createObjectsWithRetry(final SObject... objects) {
...
    id = crudService.createObjects(objects)[0];
...
}

whenever(crudService.createObjects(anyVararg())).thenReturn(listOf("a","b").toTypedArray())
whenever(crudService.createObjects(any<SObject>())).thenReturn(listOf("a","b").toTypedArray())
whenever(crudService.createObjects(any())).thenReturn(listOf("a","b").toTypedArray())
whenever(sfdcCrudService.createSfdcObjects(argThat{true})).thenReturn(listOf("a","b").toTypedArray())
...and more

The result is always null. I would expect all of these to work, but they do not. I cannot figure out what is wrong. It appears it has to do with how Java treats the varargs being passed as a param straight to a new method.

Hey, generic wizards. I have another one for you. Among these two, which one is the recommended one? and most importantly, why?

//case A
inline reified fun <T:Any?> T.doThing(name: String = T::class.simpleName ?: "") {}

or

//case B
inline reified fun <T:Any> T?.doThing(name: String = T::class.simpleName ?: "") {}

is there a more kotlin way to do the following: (interate a list, selecting an item and the item before it and performing an operation on those two elements):

fun totalDistance(aList: List<Location>) : Double{
            var total: Double = 0.0
            for(x in 1..aList.size-1) {
                total += distance(aList[x], aList[x-1])
            }
            return total
        }

pls help me, why there is reporting an error?

I have two enums

enum class Entity {
   PROJECT, WORKSPACE, ...

enum class Access {
   UPDATE, REMOVE, GRANT, ...

and i want to write an annotation

ProjectPermission("$PROJECT.$UPDATE", "$PROJECT.$READ")

@Repeatable
@MustBeDocumented
@Target(AnnotationTarget.FUNCTION)
@Retention(AnnotationRetention.RUNTIME)
annotation class ProjectPermission(vararg val permission: String)

Problem is, the annotation requires a constant, is there a way to convert the String template containing the enums to a constant? The other alternative is to write annotations

@ProjectPermission(PROJECT, UPDATE)

, but i can only have one @ProjectPermission on my method with Runtime retention, so the string route allows for more permissions

I have a problem in Boolean class returning Boolean values when compareTo() is overridden and called. As we all know that compareTo() returns Int value whether it is zero, positive or negative. So how can Boolean class implicitly convert it to Boolean form ???????? When I tried to inherit Comparable class on user-defined class it printed same (i.e. Boolean value). Comparable Class : https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-comparable/#functions Boolean Class : https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-boolean/compare-to.html

uhhh. why does this compile? https://play.kotlinlang.org/#eyJ2ZXJzaW9uIjoiMS4zLjcyIiwicGxhdGZvcm0iOiJqYXZhIiwiYXJncyI6IiIsImpzQ29kZSI6IiIsIm5vbmVNYXJrZXJzIjp0cnVlLCJ0aGVtZSI6ImlkZWEiLCJjb2RlIjoiLyoqXG4gKiBZb3UgY2FuIGVkaXQsIHJ1biwgYW5kIHNoYXJlIHRoaXMgY29kZS4gXG4gKiBwbGF5LmtvdGxpbmxhbmcub3JnIFxuICovXG5cbmZ1biBtYWluKCkge1xuICAgIHZhbCBzdW0xID0gMSArIDJcbiAgICBcbiAgICB2YWwgdGVzdDEgPSAxXG4gICAgdmFsIHRlc3QyID0gMlxuICAgIHZhbCBzdW0yID0gdGVzdDFcbiAgICArIHRlc3QyXG4gICAgcHJpbnRsbihcIiRzdW0xICRzdW0yXCIpXG59In0=

Should Kotlin Maven modules have a -javadoc Jar? And should it contain KDoc?

People, do you know any tool similar to this https://github.com/muter-mutation-testing/muter for mutating test?

This message was deleted.

Is there anything in kotlin syntax that holds it back from adding python's swapping syntax?

a, b = b, a

the only place I can think of where commas are not enclosed in

()

is

enum

classes. would that case alone cause python swap syntax to turn kotlin into an irregular language or something? are free-range commas just too dangerous for future expansion? could they not use the same solution as in

enum

and require a

;

for only the second time in the language, and thus open up all sorts of destructuring assignment, like that which you see in javascript?

Here's a fun list/map etc challenge i came across in a question in the python slack. Someone was asking how to do this in a dict comprehension, instead of with looping in python:

[
        ("carrot", ["orange"]),
        ("banana", ["green", "yellow", "black"]),
        ("lemon", ["green", "yellow"]),
        ("apple", ["red", "green"]),
]

to

{
    'orange': ['carrot'],
   'green': ['banana', 'lemon', 'apple'],
   'yellow': ['banana', 'lemon'],
   'black': ['banana'],
   'red': ['apple']
}

I was able to get it but it's pretty ugly. I tried to think whether there's anything substantially nicer in kotlin, and I couldn't think of anything. Curious to see what folks come up with 🙂

What's the difference between using a function vs a property for exposing a internal var? Or is there any

fun time() = internalTime

vs

val time = internalTime

?

I am porting code between 2 very simillar platforms and from java to kotlin and found it useful to define a bunch of extension functions and normal members and make use of the

ReplaceWith()

for

Deprecated

to help me. But I've noticed some issues. Am I doing something wrong, or are

ReplaceWith

not advanced enough (yet)?

Thanks for the invite @Alina Dolgikh [JB] 👏

is it possible to get a "reference" to a HashMap entry? something so that I can write something like this:

var f = fooMap["key"]
f = f+1

will kotlin data classes be implemented using invokedynamic when you target 14+ jvms?