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KOTLIN QUESTIONS

takeWhile which includes the actual value matching the predicate (takeWhileInclusive)
takeWhile which includes the actual value matching the predicate (takeWhileInclusive)
I wish this help you I did not find a suitable existing function yet and I also do not really like the linked solution, so I played around a bit and ended up with the following extension function:
TAG : kotlin
Date : October 22 2020, 06:10 PM , By : Bass Lander
Webflux saving to repository without using .block()
Webflux saving to repository without using .block()
Any of those help Use flatMap to chain your functions: it.map { product -> product.active = active }.flatMap(repository::save)
TAG : kotlin
Date : October 21 2020, 06:10 PM , By : Simo
Kotlin, unresolved reference on everything in VSCode
Kotlin, unresolved reference on everything in VSCode
wish helps you I had this issue when I had both the Kotlin Language by mathiasfrohlich and Kotlin by fwcd extensions installed. Uninstalling Kotlin by fwcd resolved the problem in my case.
TAG : kotlin
Date : October 20 2020, 06:10 PM , By : StacherFox
brief function code for null check in kotlin
brief function code for null check in kotlin
this will help Whenever I see code with a lot of conditional logic, I try to remember that I can "push" nulls rightward. Instead of handling if/else every time you need to test for null, imagine that you just take what you want (happy path) and pass
TAG : kotlin
Date : October 19 2020, 06:10 AM , By : aed7648
How to capture an argument that was passed to a mocked function and return it?
How to capture an argument that was passed to a mocked function and return it?
hope this fix your issue So in the service I am testing, I have a depending service which is taking an object and does some augmenting on it. I want to mock the part the depending service is doing and make the mock return exactly what it's receiving.
TAG : kotlin
Date : October 19 2020, 06:10 AM , By : Dakota Myhand
Issue when trying to import Jacoco code coverage to SonarQube: Cannot import coverage information for file, coverage dat
Issue when trying to import Jacoco code coverage to SonarQube: Cannot import coverage information for file, coverage dat
this will help I'm having some issues when trying to import Jacoco code coverage to SonarQube. , Search in Google by keywords sonarqube kotlin jacoco and
TAG : kotlin
Date : October 16 2020, 06:10 PM , By : Расул Хуров
Proposed change of `equals` to `==` can't be applied to Char and String?
Proposed change of `equals` to `==` can't be applied to Char and String?
will help you Just to be sure we're on the same page, it is a Char because the filter method that you use operates on the string as a sequence of characters. Therefore, it.equals("a") is effectively comparing a Char with a String. This can never be t
TAG : kotlin
Date : October 14 2020, 01:00 PM , By : Luke
How to use kotlin's default parameter only if the input is not null?
How to use kotlin's default parameter only if the input is not null?
help you fix your problem Depends on what you mean by less verbose.One way is using the null-safe-operator (?.) and something like let:
TAG : kotlin
Date : October 14 2020, 04:00 AM , By : SAHIL THUKRAL
Please Explain to me this kotlin statement?
Please Explain to me this kotlin statement?
hope this fix your issue this@A is called a qualified this, and it is shortly documented here.this@A is used to access the outer object of type A. Because B is an inner class, instances of B have to be created using an instance of the enclosing class
TAG : kotlin
Date : October 13 2020, 11:00 PM , By : Baldiri
How to check if a string is a valid email in android?
How to check if a string is a valid email in android?
I wish this help you Based on this answer in java (How should I validate an e-mail address?), you can use extension function to check the validity in kotlin.
TAG : kotlin
Date : October 13 2020, 09:00 PM , By : user6023756
This annotation is not applicable to target member property without backing field or delegate
This annotation is not applicable to target member property without backing field or delegate
Hope this helps Try using @get:Provides instead of just @Provides on the var cookie.EDIT:
TAG : kotlin
Date : October 13 2020, 08:00 PM , By : Jingyi Wu
How to split on unicode whitespace in kotlin
How to split on unicode whitespace in kotlin
Any of those help Since Java 7 Pattern allows to specify the UNICODE_CHARACTER_CLASS-flag which would basically also work for your current issue:
TAG : kotlin
Date : October 13 2020, 06:00 PM , By : Austen Green
How can Kotlin's Set be covariant when contains() takes E?
How can Kotlin's Set be covariant when contains() takes E?
like below fixes the issue Declaration-site covariance in the form of the out modifier misses a useful use case of making sure that an instance passed as an argument is generally sensible to pass here. The contains functions are a good example.In the
TAG : kotlin
Date : October 13 2020, 01:00 PM , By : Anna Novikova
Kotlin inline class in JUnit tests
Kotlin inline class in JUnit tests
it should still fix some issue What you probably wanted to do was val name = nameInlineClass.value, but I'll try to explain the error.See Representation from docs (includes code sample):
TAG : kotlin
Date : October 13 2020, 06:00 AM , By : Sergey Pomazov
Lambda as a function parameter -> accept methods only from particular class
Lambda as a function parameter -> accept methods only from particular class
around this issue For this, functions simply aren't an appropriate type. I'd declare a type whose values correspond to methods of S, so
TAG : kotlin
Date : October 13 2020, 03:00 AM , By : MegamiahX
Kotlin - How do I concatenate a String to an Int value?
Kotlin - How do I concatenate a String to an Int value?
should help you out $ dollar – Dollar symbol is used in String templates that we’ll be seeing next
TAG : kotlin
Date : October 12 2020, 05:00 PM , By : Michael Erisman
Why I Cannot Access to this function?
Why I Cannot Access to this function?
This might help you You're calling getComplicationId like a static method, but it's an Instance method instead. To solve, put that method (and the variables it uses) inside a Companion Object :
TAG : kotlin
Date : October 12 2020, 10:00 AM , By : Anil Vighne
Kotlin test, how to run BeforeEach with DescribeSpec test style
Kotlin test, how to run BeforeEach with DescribeSpec test style
help you fix your problem On the new version of KotlinTest 3.3 there are new Listeners to define beforeTest, afterTest, beforeSpec and so on.In this case a posible solution should be:
TAG : kotlin
Date : October 11 2020, 09:00 PM , By : Nicks
Convince Kotlin compiler map has a key
Convince Kotlin compiler map has a key
this one helps. Kotlin Collections already defines the Map.getValue() extension function, which returns an element with non-nullable type or throws NoSuchElementException.Now this will compile fine:
TAG : kotlin
Date : October 11 2020, 09:00 PM , By : Dion Doli
how do you declare static property in kotlin?
how do you declare static property in kotlin?
To fix this issue
TAG : kotlin
Date : October 11 2020, 09:00 PM , By : verytestablestuff
How can i call an interface in kotlin?
How can i call an interface in kotlin?
wish helps you The SpeechService.Listener { } syntax for SAM interfaces is only possible when the interface is written i Java (see https://kotlinlang.org/docs/reference/java-interop.htmlsam-conversions). Because the interface is written in Kotlin, yo
TAG : kotlin
Date : October 11 2020, 02:00 PM , By : alestrat
Check if any array item is not empty
Check if any array item is not empty
I think the issue was by ths following , No, you can't tell how many element in an array are empty without visiting them. You can use any and all, both of which iterate internally though:
TAG : kotlin
Date : October 11 2020, 07:00 AM , By : mulebeginner
kotlin, where the return from inside the let go
kotlin, where the return from inside the let go
will help you The rule in Kotlin is that a plain return returns from the nearest fun.See the docs here.
TAG : kotlin
Date : October 10 2020, 08:00 PM , By : DHMansuri
Kotlin: Should mutableList be declared as Val or Var?
Kotlin: Should mutableList be declared as Val or Var?
I hope this helps you . I think it's declared as val because the list will be the same always, the only thing that changes is it's elements. You'll never do something like:
TAG : kotlin
Date : October 10 2020, 05:00 PM , By : Bnj
Convert Long to String in Kotlin
Convert Long to String in Kotlin
seems to work fine What am I missing here? , You could use Kotlin String templates:
TAG : kotlin
Date : October 10 2020, 10:00 AM , By : Mamadousalieu
Extension property inside class: Unresolved reference: errorResponse
Extension property inside class: Unresolved reference: errorResponse
With these it helps This is because the errorResponse extension is only available in the context of the companion object of TransportService when you define it there.If your extension function doesn't need the companion's properties or methods, there
TAG : kotlin
Date : October 10 2020, 07:00 AM , By : Johan Oliwsson
How to extend enums in Kotlin?
How to extend enums in Kotlin?
may help you . There is more to the reason why enum inheritance is not supported than "inheritance is evil". In fact, a very practical reason:
TAG : kotlin
Date : October 10 2020, 07:00 AM , By : Krasimir Zlatkov
Idiomatic way in kotlin to transform/append to a list?
Idiomatic way in kotlin to transform/append to a list?
To fix this issue While your solution is quite readable, it copies all of the items of the original List on every iteration of the for-loop, as += on a var newList: List will create a new list each time. The computational complexity of the worst case
TAG : kotlin
Date : October 10 2020, 06:00 AM , By : carlito_kr
How to avoid nest 「null check」by "?.let"?
How to avoid nest 「null check」by "?.let"?
wish helps you There are extension functions out there to achieve what you're looking for, you can find them in this thread https://discuss.kotlinlang.org/t/kotlin-null-check-for-multiple-nullable-vars/1946But honestly, you're probably better of just
TAG : kotlin
Date : October 10 2020, 05:00 AM , By : L.Mouzakiti
How to simply add another source to MediatorLiveData in kotlin?
How to simply add another source to MediatorLiveData in kotlin?
may help you . I want to combine multiple data sources in a MediatorLiveData. Unfortunately, there are not many examples yet. So in my ViewModel I have , Having done quite some research.. I found it out. Here is an example
TAG : kotlin
Date : October 09 2020, 07:00 PM , By : KS4Data
Convert Set<Int> to varargs efficiently in Kotlin
Convert Set<Int> to varargs efficiently in Kotlin
To fix the issue you can do I want to convert a Set of ints into a varargs (array of strings) and vice-versa. , This is a bit simpler
TAG : kotlin
Date : October 09 2020, 06:00 AM , By : Andrew Bott
Getting an error Using 'body(): ResponseBody?' is an error. moved to val with okhttp
Getting an error Using 'body(): ResponseBody?' is an error. moved to val with okhttp
fixed the issue. Will look into that further It looks like you're using OkHttp 4.0.0. The response.body() function has been deprecated. Instead, you need to access the body as a val, like this:
TAG : kotlin
Date : October 09 2020, 05:00 AM , By : Станислав Сапогов
Kotlin String to Int or zero (default value)
Kotlin String to Int or zero (default value)
hop of those help? I think the best solution is to tell value is Int and use Elvis operator to assign value 0 if it can't be converted.
TAG : kotlin
Date : October 08 2020, 08:00 PM , By : 24Solo
Return value only of the faster coroutine
Return value only of the faster coroutine
I think the issue was by ths following , How can I run multiple coroutines in parallel and return only the value of the one that finishes first? , I came up with following implementation:
TAG : kotlin
Date : October 08 2020, 05:00 PM , By : M. Neur
Is there a Kotlin Coroutines Channel equivalent of RxJava's onDispose?
Is there a Kotlin Coroutines Channel equivalent of RxJava's onDispose?
To fix this issue I assume you talking about doOnDispose in RxJava. In this case you are sending elements to the channel and would like to know when the downstream had cancelled the channel. If you structure your producing code in a single function,
TAG : kotlin
Date : October 08 2020, 07:00 AM , By : jianying.luo
Create fat jar from kotlin multiplatform project
Create fat jar from kotlin multiplatform project
With these it helps I did hit that bump and used this work around.1. Restructure your project
TAG : kotlin
Date : October 07 2020, 01:00 PM , By : Claus
Short circuiting operation in Kotlin sequences
Short circuiting operation in Kotlin sequences
To fix this issue The sequence works exactly as you expected. It performs on map checks the takeWhile condition and does only continue if it is true.One problem could be IntArray(numberOfPages). This creates an array of 0 of the size numberOfPages. S
TAG : kotlin
Date : October 07 2020, 07:00 AM , By : Sai Vijay
How to output deprecation warnings for Kotlin code?
How to output deprecation warnings for Kotlin code?
around this issue The java compiler and kotlin compiler have completely different options. The -Xlint option does not exist for kotlinc. You can run kotlinc -X to show all the -X options.The -Xjavac-arguments argument allows you to pass javac argumen
TAG : kotlin
Date : October 07 2020, 07:00 AM , By : Jay B
Why does generated getter method have dollar signs in it?
Why does generated getter method have dollar signs in it?
This might help you That behavior is on purpose as mentioned in the official documentation.
TAG : kotlin
Date : October 07 2020, 07:00 AM , By : Vadym K.
For a final class why does when complain?
For a final class why does when complain?
I think the issue was by ths following , Adding sealed without other changes is pointless: it makes the class abstract and impossible to subclass, so you'll never have an instance. I believe this is a compiler bug, it's very similar to https://youtra
TAG : kotlin
Date : October 07 2020, 05:00 AM , By : gregmerriman
Reference value of constant with KDoc
Reference value of constant with KDoc
this one helps. Currently, {@value} tags are not supported by KDoc.The closest issue requesting this is 488, so you can up-vote and/or comment on it.
TAG : kotlin
Date : October 06 2020, 07:00 PM , By : Temonidas
How to create this coroutines in kotlin?
How to create this coroutines in kotlin?
this will help I am trying to print Hello in between World 4 from this code. , You need this minimal change to your spin-waiting loop:
TAG : kotlin
Date : October 06 2020, 05:00 PM , By : Hanz Llanto
OkHttp: NoSuchMethodError copyInto in TlsUtil
OkHttp: NoSuchMethodError copyInto in TlsUtil
hope this fix your issue I got the same issue when I was using okhttp3.mockwebserver.MockWebServer with https enabled with a server certificate from okhttp-tls.In my case, the problem was that by just importing the com.squareup.okhttp3:okhttp-tls:4.2
TAG : kotlin
Date : October 06 2020, 01:00 PM , By : Cy Albright
Why do unreachable statements method not result in a compilation error?
Why do unreachable statements method not result in a compilation error?
it helps some times Unreachable statements don't result in compilation errors in Kotlin, because it's a language design decision. Java language designers decided for it to be an error, but not every language should agree with them. Scala, another JVM
TAG : kotlin
Date : October 06 2020, 11:00 AM , By : wonder
Static/Const map key check at compile time
Static/Const map key check at compile time
it should still fix some issue Your best bet is to write a unit-test and force run the unit-test as part of the compile/build loop. A longer way is to have enum class as key of the static map. Thus, compiler will produce an error whenever you put ele
TAG : kotlin
Date : October 06 2020, 01:00 AM , By : petunia
Escaping double quotes inside backticks
Escaping double quotes inside backticks
I think the issue was by ths following , Special characters can be used in method names if escaped with back-ticks. Your example compiles in my Kotlin project. But it also depends on the target platform, if compiling to the Android then the set of ch
TAG : kotlin
Date : October 06 2020, 12:00 AM , By : Nickolay Dolgopolov
Does Kotlin have primitive types?
Does Kotlin have primitive types?
will be helpful for those in need No... and yes.Kotlin doesn't have primitive type (I mean you cannot declare primitive directly). It uses classes like Int, Float as an object wrapper for primitives.
TAG : kotlin
Date : October 06 2020, 12:00 AM , By : Shubhnarayan Tiwari
What is exactly null in kotlin and why i can't cause NPE with it?
What is exactly null in kotlin and why i can't cause NPE with it?
I think the issue was by ths following , You code doesn't cause NullPointerException because takeIf is an extension function.Extension functions are translated into method receiver, first argument being the object you invoked your function on.
TAG : kotlin
Date : October 05 2020, 11:00 PM , By : manikhan60
Why would you use a Kotlin companion object rather than an initializer block for creation?
Why would you use a Kotlin companion object rather than an initializer block for creation?
Any of those help This practice of considering static factory methods (aka companion objects in Kotlin) over constructors (or init blocks in Kotlin) has been borrowed from the Java world. The differences between static factory methods and constructor
TAG : kotlin
Date : October 05 2020, 04:00 PM , By : GHOST
how to use operator overloading in Kotlin to divide a number by a numeric vector
how to use operator overloading in Kotlin to divide a number by a numeric vector
I hope this helps . The problem is that the names of the functions/operators are the same and would generate the same static Java function name. You can easily assign a new Java-name with the @JvmName annotation (see https://kotlinlang.org/docs/refer
TAG : kotlin
Date : October 05 2020, 12:00 PM , By : Jeremy Kronberg
How to use get() with backing fields in kotlin
How to use get() with backing fields in kotlin
I wish this helpful for you This is because you are using the = operator which is setting the getter to be a lambda.You have two options:
TAG : kotlin
Date : October 05 2020, 10:00 AM , By : Teddy Putot
How to map string to function and call it later
How to map string to function and call it later
I hope this helps . Let's look at in another way.What if instead of trying and failing to specify the type, we give Kotlin chance to infer it, by specifying incorrect type:
TAG : kotlin
Date : October 05 2020, 06:00 AM , By : Mart2k
Kotlin enum constructor argument 'must be initialized' with companion object constant without qualifier name
Kotlin enum constructor argument 'must be initialized' with companion object constant without qualifier name
Hope that helps That companion object will be instantiated the moment your class becomes available (compile time). Then you are telling your class that, for it to become available, it needs a class that is not yet available (because you're compiling
TAG : kotlin
Date : October 05 2020, 01:00 AM , By : AeJae Miranda
Please explain to me class delegation in Kotlin
Please explain to me class delegation in Kotlin
fixed the issue. Will look into that further Assuming you've already read the docs, and want some more, I'll try to give you my explanation…To show why delegation is needed, let's look at the main alternative.  And because your example is a little to
TAG : kotlin
Date : October 05 2020, 12:00 AM , By : Harp S
Error:(1, 41) Kotlin: Symbol is declared in module 'jdk.internal.opt' which does not export package 'jdk.i
Error:(1, 41) Kotlin: Symbol is declared in module 'jdk.internal.opt' which does not export package 'jdk.i
With these it helps I have a beginner problem. Just installed IntellijIDEA and JDK (Java Development Kit) and can't build my project. , The proper main function with arguments looks like this:
TAG : kotlin
Date : October 04 2020, 06:00 PM , By : TonY_Satria
How to properly make blocking service calls with Kotlin coroutines?
How to properly make blocking service calls with Kotlin coroutines?
I wish this help you Because the api you are using makes blocking calls doesn't necessarily mean that you need to adhere to that. If you are already using Kotlin coroutines you can easily use withContext(Dispatchers.IO to require a function to run on
TAG : kotlin
Date : October 04 2020, 11:00 AM , By : Venu Madhav
Gson SerializedName in a Kotlin interface
Gson SerializedName in a Kotlin interface
should help you out I think, that interfaces it's not a good place to have properties (or state). Interfaces very good fits to establish behavior (functions). I'd rather suggest you to use abstract class for your purpose and it will work as you expec
TAG : kotlin
Date : October 03 2020, 12:00 PM , By : alemedi
Kotlin convert FileTime to day, month, year
Kotlin convert FileTime to day, month, year
fixed the issue. Will look into that further FileTime ➙ Instant ➙ ZonedDateTime I'm assuming that you're using Java 8 or later. You must convert the FileTime to an Instant. You can then apply a ZoneId to the Instant to get a ZonedDateTime object for
TAG : kotlin
Date : October 03 2020, 02:00 AM , By : Ankush
Kotlin how to move a file to a other directory?
Kotlin how to move a file to a other directory?
I think the issue was by ths following , Kotlin provides an extension function to Java's File: File.copyTo(target: File), but unfortunately no File.moveTo(target: File). If you only use small files, you can just use the copy functionYou can do this p
TAG : kotlin
Date : October 03 2020, 01:00 AM , By : Sukhraj Singh
If first param is true, then must pass second param in function
If first param is true, then must pass second param in function
hope this fix your issue Instead of trying to make code that nobody will be able to understand, why not divide your function in getActiveCartTestSync and getActiveCartTestAsync. The thing you want might be achievable by using reflection, however you
TAG : kotlin
Date : October 02 2020, 11:00 PM , By : Kunal Vyas

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