Sequence.flatMap { iterable }? @xduke wrote: I think it would be nice to have a version of flatMap on Sequence that takes an Iterable. For example the second asSequence() call feels superfluous and reminds me of Java’s .stream() / .collect() ceremony. val mobileNumbers = contacts.asSequence() .flatMap { it.phoneNumbers.asSequence() } .filter { it.type == "mobile" } .map { it.number } Here’s the full code with the collection based...

Simple Website into an Web App @srk13594 wrote: Iam new to kotlin and trying to convert our website into an webapp, the problem which iam facing is - my webapp is only showing the loading gif of our website but not loading the website. although the code is working fine on other websites. Kindly help me fix it. activity_main.xml AndroidManifest.xml MainActivity.kt package...

Login on API REST - Cookies management @julien.henrotin wrote: Hello ! I actually work on a application developed with Kotlin who use the Microstrategy REST API. I need to connect with my login on the server so I use the login request ( <a href="https://demo.microstrategy.com/MicroStrategyLibrary/api-docs/index.html#!/Authentication/postLogin" rel="nofollow...

Kotlin library to create docx with template @michalski695 wrote: What is the best way to create docx file with template? I was trying Apahe Poi or JavaScript Docxtenplater. The frst one not work on my project, second is very easy but not work on webvew. Posts: 1 Participants: 1 Read full topic

ES3 experiments @RandomByte wrote: Hi! I know ES3 is unsupported. I just tried to put the compiled kotlin stdlib js file into a program which still is on ES3. I just wanted to see if it works. It complains about the keywords final and native which seem to be used in the stdlib as variable and function names. Without having tried to set something up for a more modern ES version, I am wondering how this is supposed to work in...

ViewBinding vs Kotlin Android Extensions @dominicJ wrote: As in title. Is it reasonable to switch to ViewBinding? Personally I never had any problem with Kotlin Android Extensions (and I use them in large projects), but some people pointed out that: they imported incorrect layout extensions (never occured to me) ViewBinding is type safe (just like Kotlin Android Extensions) ViewBinding is null safe (just like Kotlin Android Extensions, just write ?....

I need to output data from activity to a fragment @screamy1 wrote: When the application starts, null is displayed. I think that I am not correctly assigning a value to the TextView. class MyFragment : Fragment() { private lateinit var textView: TextView companion object { private val TEXT_FIELD = "text_field" @JvmStatic fun newInstance(text_field: Int) = MyFragment().apply { arguments = Bundle().apply {...

How to write in kotlin @sudeep.sager1234 wrote: in java while (pos1 < len1 && (ch1 = str1.charAt(pos1++)) == ‘0’) { zeroes1++; } same i want to write in kotlin please help me Posts: 1 Participants: 1 Read full topic

Error Handling @brymher wrote: can there be something like try{}silence(e: Exception) just assume the error if no action is required to be taken on the error try{ throw Exception("For exceptions that you do not want to work handle") } silence(Exception) Posts: 1 Participants: 1 Read full topic

Client TCP Kotlin @GlezMtzDiego wrote: I’m create a socket in my App Kotlin val client = Socket("192.168.137.235", 9100) client.outputStream.write("Hello from the client!".toByteArray()) client.close() But when you start the application and executed that code shows the following error 2019-10-17 115047.444 1924-1924/com.prueba.print E/AndroidRuntime: FATAL EXCEPTION: main Process: com.prueba.print,...

Delegated property names in javascript code @andrew.kuryan wrote: I have a delegated property name in kotlin code. In compiled javascript code, it is transformed into an object property name_pw16at$_0. My experiments show that this suffix is independent of the type of delegate and the actual type of property. In the official documentation describes how delegated properties are represented in jvm classes: with the suffix $delegate added to the real...

Elegance in language design - aka My Gripe with Kotlin @xduke wrote: tl;dr Was elegance a language design goal? What does that concept mean in Kotlin? When I first looked at Kotlin a couple of years ago, I was starting with a lot of enthusiasm because I heard a lot of people praising the language. When I actually started coding however, very soon I felt disappointed and ultimately stopped my journey to Kotlin. The reason for that mostly was that for me Kotlin lacked...

Using a bitmap inside a new Android Project @pablobhz wrote: Hello Everyone. I know its kinda of a newbie question but i’m having a few difficulties around here. I’m tying to draw a bitmap inside a view and write a text on it. Right now, my code goes as follows: package com.example.desenhanaview import android.graphics.Bitmap import android.graphics.Canvas import android.graphics.Color import android.graphics.Paint import...

Describing js lib by using external @uluna_wood wrote: I am trying to learn, how to create a kotlin library. I know how create a library that is written on kotlin. I created a simple test project. that has only one js file and one kotlin file. Js file contains one function, kotlin file contains a header for this function with external prefix. When I create a library from such project ( like it is described in kotlin tutorials) it all works...

Avoid allocation of the Continuation object in tail recursive suspending functions @mtimmerm wrote: When a suspending function makes another suspending call, it allocates a Continuation to remember its state in case the called function suspends. This happens even for tail calls, even though it is not necessary to maintain the function’s state in that case – it would be fine to pass through its continuation parameter instead of allocating a new one. Presumably the tail call Continuation is...

Understanding Thread Count In Kotlin Flow With Suspend And runBlocking @ahsansaeed067 wrote: Hey, I’m trying the new Kotlin Flows experimental API and write a simple example by following this link. @ExperimentalCoroutinesApi val ints: Flow = flow { for (i in 0..5) { delay(100) println(message = "Emitting data $i -> $coroutineContext") emit(i)...

Create a textlabel or remove with a function @fede.luna wrote: Hello, i I would like to know how to add and remove a textlabel or any other component by a function or a button in Kotlin Thank you very much Federico Posts: 1 Participants: 1 Read full topic

Syntax suggestion for "when..." @BazCuda wrote: Coming from a predominantly (but not exclusively) Delphi/Pascal background for the last two decades, I took to the Kotlin syntax like a duck to water, and I’m loving’ it ! I’ve also dabbled in C, C++, VB, C# and Java, etc. during that time. With the exception of Delphi Pascal’s ubiquitous and clunky “begin…end” blocks instead of curly braces (a long-standing bugbear of mine), the Delphi/Pascal...

Kotliln Serialization not handling unknown fields @mariamercyabraham wrote: The unknown/new fields in json string throws JsonDecodingException and causes crashes. Posts: 1 Participants: 1 Read full topic

Step down @tieskedh wrote: I would love to see that Kotlin would support the step-down rule in a bigger way… The way I defined is most probably not the best way, so other options would be great. Explicit: fun highLevel0() = midLevel1() // not allowed, method not defined in StepDown fun highLevel1() = midLevel1() //allowed fun highLevel2() = lowLevel() //not allowed, move lowLevel up one level @StepDown[highLevel1,...

Int Range. random function not compiling @norricorp wrote: Using the above function https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.ranges/random.html in this code a10 = (0…9).random() + 48 on compilation get e: src/main/kotlin/Test.kt: (36, 27): Unresolved reference: random But I though this was part of the standard library so what am I...

How do I use the "reified" keyword meanwhile do not expose other property which should be privite? @lesincs923 wrote: eg: object ModelFactory { val modelMap = HashMap() inline fun getModel(): T { var model = modelMap[T::class.java] if (model == null) { model = T::class.java.newInstance() modelMap[T::class.java] = model } return model as T } } as the above code showing,you need to declare public keyword to the modelMap...

Set Dynamic SerializedName annotation for Gson data class @pCulv wrote: The response I’m returning from my api call via Retrofit has a dynamic value for each object. I need to be able to edit value in the @SerializedName annotation with each call. Here’s the JSON response: { "data": { "/storage/emulated/0/DCIM/Camera/IMG_20190920_110850.jpg": { "id": "4f7e74d1-afa8-4924-a8ab-ea9360400b", "location":...

Where and how should I announce a new open source Kotlin library? @KotlinFan554001 wrote: I’m finishing a new open source Kotlin library. How and where should I announce it? GitHub AlexCue987/konsumers Advanced work with Kotlin sequences. Contribute to AlexCue987/konsumers...

Calling Kotlin from HTML(Javascript), TypeError problem @Latesoft wrote: Hi, I get browser error: “TypeError, …Is not a function”, when i try to pass (this) as argument to the Kotlin function from HTML input. Calling a pure javascript function works just fine. I cannot find anything wrong with the compiled Javascript either. in HTML: input type=“radio” onclick=“Mymodule.test(this)” What am i doing wrong? If i remove the argument (this), it works....

Help copying JS dependencies with Gradle @rnikander wrote: I have the following Gradle task. I’m trying to put my multiplatform outputs into an unpacked WAR directory so I can run it in a Java servlet container in my dev environment. It fails because that last clause (2) puts its files not in $dest/static but in static. It also affects the (1) clause, so that it (1) puts its files in static/static instead of $dest/static. Anyone know how to write...

How do I execute Kotlin code run in a Chrome browser @pwplus7 wrote: I’m a kotlin newnie Posts: 1 Participants: 1 Read full topic

[Ask] How to set maven url with AwsCredentials @davidasync wrote: I have this code at build.gradle maven { url "abc.com" credentials(AwsCredentials) { accessKey = "a" secretKey = "b" sessionToken = "c" } } I want to migrate it with kotlin-dsl, any advice to change it to kotlin dsl? Posts: 1 Participants: 1 <a...

Alternatives to implicit conversion, lifting String to Expr type @rnikander wrote: I have some code that builds up SQL expressions. I created a group of sealed classes. sealed class SqlExpr class SqlPiece(val sql: String) : SqlExpr() class SqlAnd(vararg parts: SqlExpr) : SqlExpr() ... It would be nice to write something like: SqlAnd("x", someExpr, "foo is null", otherExpr) instead of: SqlAnd(SqlPiece("x"), someExpr, SqlPiece("foo is null"), otherExpr) In some languages I...

Announcing Konsumers - library for advanced work with sequences @KotlinFan554001 wrote: Developed to make solving many common problems easier, and to improve performance in cases when iterating the sequence and/or transforming its items is slow. Advanced features to split and transform sequences, to make solving complex problems easier. Allows to iterate a sequence once and simultaneously compute multiple results, improving performance. Allows to use one computation,...