Primary constructor changes semantics @emacampolo wrote: Given the following class , IntelliJ suggests me to convert the secondary constructor to a primary constructor but that would break class invariant. class Person { constructor(email: String) { this.email = email } var email: String set(value) { require(value.isNotBlank(), { "The email cannot be blank" }) field = value } } After applying the migration, the...

Typealias for data classes that renames properties @reitzig.1 wrote: Going through the Kotlin introductory course I reached typealias and thought of something that I know from Swift: typealias Person = (name: String, age: Int) This looks from the usage site just like a minimalistic struct. Simulating this does not seem to be possible in Kotlin: there are no parameter labels, and renaming properties is not a thing. Why not? Syntax would have to be invented,...

How to show JavaDoc for Class instead of constructor in IDE? @nguyenxndaidev wrote: If class A: B() { ... }, when I press Ctrl + Q in IntelliJ IDEA on class B, I get docs for constructor of class B. How could I see the docs for class B? Posts: 1 Participants: 1 Read full topic

iOS arm32bit support @richardperng wrote: Hello, I was wondering if iOS arm32bit support is on the roadmap for Kotlin/Native. if it is on the roadmap, what’s the ETA? We are trying to make some decisions on our next language to support and we would love to use kotlin, but need ios arm 32bit at least for the foreseeable future. Posts: 1 Participants: 1 <a...

Run common module test in Intellij @knolle wrote: I have a common module and a respective JVM module. The common module contains a function and a matching unit test, using the common annotations etc. The JVM module contains another class and associated test. Now when I run the tests via gradle module jvmtest , the common module test is also executed. Thats fine! But how can I run (and if necessary debug) the common module test in the IDE? If I...

Class&lt;T&gt; type on an template Class of type T, why? @luistrigueiros wrote: I the class bellow I had to make abstract because I would not find a why to to have the “type” method implemented I has expecting to be able to do something like: abstract fun type(): T::class.java But it does not work. and I ended up to have to redefine this method in several classes. package com.integrando.jurigest.wire.codec import io.vertx.core.eventbus.MessageCodec...

Mutex implementation question @btw wrote: I’m hoping to write an efficient read-write lock for coroutines. There is an inefficient implementation given here: https://github.com/Kotlin/kotlinx.coroutines/issues/94 Initially, I was using as a starting point the official Mutex source: <a...

Can "typealias" deprecate "import as" or vice versa? @Revin wrote: some background(syntax highlighting seems not working properly, sorry for that): in Java, one can write Mapxxx, and the compiler won’t get confused about the >> there because of a trick in the parser. in kotlin however one cannot write val set:Set=... because the compiler will get confused about >= there. so one might want to use import Setas SetOfString;val set:SetOfString=..., but it won’t...

OO style vs FP style @jasonab wrote: I’m writing a user management web service in Kotlin, and it’s forced me to consider more deeply how I approach my code - should I stick with old-school OO approaches to my data and behavior, or should I consider a more purely functional approach to my coding? Let’s take an example: I have a User object, that among other things has a username, name, and password. Let’s say I want to change...

Move selected Kotlin function(s) to a separate new file in IntelliJ IDEA @nekomatic wrote: I like the ‘move class to own file’ functionality of ReSharper. Is such functionality available for Kotlin in IntelliJ? I.e. to move selected function to its own file? Posts: 1 Participants: 1 Read full topic

kotlin java.lang.IncompatibleClassChangeError @krmao wrote: FATAL EXCEPTION: main Process: com.xxx.mongo, PID: 10867 java.lang.IncompatibleClassChangeError: Couldn't find com.xxx.base.CXActivityLifecycleCallbacks.[] at...

Kotlin scripting - best practice/memory leak @bklink wrote: We are using the Kotlin scripting capabilities to store input and output data combined with their processing script. To transform stored input data to output data we load the stored script into a Kotlin scripting engine, evaluate it and call a specific function on it that actually applies the transformation/business logic. Since the first evaluation by the engine is quite expensive regarding...

Object creation and function calling ambiguity issue @akhileshsk wrote: I am newbie to this Language. I have a general query regarding object creation of a class whose name is lets say Person and we have a function in the main class called Person. When we try to create a object of Person class by Person(), how compiler differentiate between a function calling and object creation? Posts: 1 Participants: 1 <a...

Mac OS Silent install @andrewsk wrote: I’m trying to create a remote installer for Kotlin to be used with Intellij IDEA. Per the manual install instructions, can I place the contents of the zipped installer into /usr/local/bin and into /usr/local/lib? My goal is to create a .pkg file to distribute to classroom computers. Posts: 1 Participants: 1 <a...

EasyMock conflicting with coroutines; impossible to test `suspend` in interfaces? @nanodeath wrote: Hi, If I have code that looks like this, with junit 4.12, Kotlin 1.2.0, and the 0.21 coroutine packages: interface Interface { suspend fun foo(): String } class Caller(private val instance: Interface) { fun execute() { runBlocking { instance.foo() } } } @Test fun test() { runBlocking { val mock = createMock(Interface::class.java)...

Coroutines and protobuf async streams @abegemot wrote: val jobs = arrayListOf() for(n in 1…120) { jobs += launch(newSingleThreadContext(“NEWTHREAD”)) { ToProtobuf(grpcServer, complexObject.build(), n) } } jobs.forEach { it.join() } println(“JOB DONE”) fun ToProtobuf(grpcServer: GRPCServer, complexObjectComplexObject,nInt){ val grpcObserver=SX(n.toString()) grpcServerThe .addLessonDBNonBlocking(complexObject,grpcObserver)...

Kotlin Engineers Required, NYC @tlovellbutt wrote: My client is looking for 3 contract Android Engineers with ideally Kotlin experience for a rewrite of their hugely successful Android app.They will also consider strong iOS Engineers with Swift experience who are prepared to work with Kotlin. Contract Type: W2, can opt in to healthcare if needed Contract Length: 6 Months+ (could turn full time) Location: Manhattan, NYC (Onsite) Rate:...

Is there a way to use the "new" operator with arguments on a dynamic variable in Kotlin JavaScript? @Dsfadsadfsffdsasfdadfs wrote: For example: “new window.classNameK(a,b,c)” does not seem to have any representation in Kotlin. If there were no parameters, I could call it using js(“new window.classNameK()”, but since it does have parameters, I can’t call it. I’ve been able to make functions in JavaScript and call them, but it is a very ugly solution. I suppose I am just proposing this...

How to add kotlin native support for an existing swift iOS project? @albertgao wrote: For example. A brand new Tab-Nav sample from New Project Previously, when I can use the following build.gradle to compile the main.kt and finally replace the main entry of an Obj-C project. buildscript { repositories { mavenCentral() maven { url "https://dl.bintray.com/jetbrains/kotlin-native-dependencies" } } dependencies { classpath...

How to test protected function @knolle wrote: In Java protected members are also visible in the whole package and thus could be tested right away. In Kotlin however, protected members are only visible in subclasses. How are they supposed to be tested in unit tests? From my point of view, protected members are part of the API and really should be tested. Posts: 1 Participants: 1 <a...

Android project supporing only kotlin @pedromassango wrote: Is there any chance to disable Java sopport on android studio? it looks like two languages support make android studio more eavy (I’m just saying). Posts: 1 Participants: 1 Read full topic

Kotlin Coroutines in Android @pedromassango wrote: Hello guys, is there any android sample using Coroutines? thanks Posts: 1 Participants: 1 Read full topic

Desktop apps with kotlin @pedromassango wrote: Is there any way to build desktop apps with kotlin? if yes how can I do that? Posts: 3 Participants: 3 Read full topic

"Referential equality" Same Types, Different Result @laguz1254 wrote: Title : “Referential equality” case #1 var numA: Int = 100 var numB: Int = 100 println(numA === numB) // Result : true var numC: Int? = numA println(numC === numA) // Result : true case #2 var numA: Int = 1000 var numB: Int = 1000 println(numA === numB) // Result : true var numC: Int? = numA println(numC === numA) // Result : false summary 1. println(numA === numB) : All...

How can java.util.ArrayList inherit from MutableList @yoymoyroy wrote: hi i try to understand some Konzepts about Kotlin. when i was looking at the collections at https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.collections/ that ArrayList or HashMap have The JS Tag for the Javascript Plattform on it. Which I understand means its only used when targetting...

Kotlin java source in gradle project @alcheorg wrote: How to config kotlin in project with not standart source directories? Java plugin can do this for java projects java { sourceCompatibility = JavaVersion.VERSION_1_8 sourceSets { getByName("main") { java { srcDirs.plus(file("src/generated/main/java")) } } } } Posts: 1 Participants: 1...

Detect data class in runtime @darksnake wrote: I just found that I need to create a copy of an object (out Any) if it is possible. In kotlin java clone method is protected by default so I can’t just clone it if it implements Cloneable interface. I think it is a good solution since java clone was not useful anyway. If I do understand correctly, the kotlinish way of doing that is to use data classes with copy method. It seems that it is...

Corutines context speed @abegemot wrote: I have to perform kind of web scraping parsing and storing to DB, In order to improve the speed I’m using coroutines, by a fortunate accident all my work can be expressed in calls to several function with just one argument an Int. Like findNewsPaper(n:Int) or findSportPaper(n:int) This allows me to pack the work in bundles of some size and repeat that operation as much times as needed. So...

Null safety in javascript @mattmook wrote: I’ve started writing multi-platform modules and pretty quickly have started noticing some inconsistencies between JVM and JS and as such wanted to get a better understanding of what I should be doing. For example, given the following sample code: class Upper(id: String) { val upper: String = id.toUpperCase() } JavaScript compiles this to: function Upper(id) { this.upper =...

Kotlin bytecode on default parameters @shidobecker wrote: Hi I’m having an argument with someone on my team about the bytecode generated when I use default parameters on the constructor and when I don’t. When I use it, Kotlin creates another constructor, and we are arguing if we should keep the simple implementation but with that extra constructor, or if we should create a much more boilerplate and harder do maintain code to avoid the...