Firebase or database php @dbfdbhj wrote: i want ask what is better database use php or fire base can i transfer database php to fire base can i make part of app by fire base and anther one by php database cane i make dating app ( add users profiles use fire base ) thanks Posts: 2 Participants: 2 <a href="https://discuss.kotlinlang.org/t/firebase-or-database-php/7299">Read full...

Purity indicator for functions @rloic wrote: Why the community think about purity indicator in functions like “!” in ruby. For example we may use: println!("salut") instead of println("salut") This have two major benefits: The first one is that developpers will have a better readability of the code. For example we can force the operator plus() to be pure and accept that the operator plusAssign!() to be unpure. As the code val list =...

Then/catch/finally semantics for coroutines @venkatperi wrote: then/catch/finally semantics for coroutines may feel like a step backward towards promises, however a few use cases are: reducing try {} catch {} boilerplate error recovery with catch Feedback welcome. Posts: 1 Participants: 1 <a...

2 small things I hope to be improved @shinayser wrote: Hey guys. I’ve been using kotlin for about a year now. The best language so far in the market today. But the are some small things I believe should be improved for future releases and I would like to share with you. Auto assign null to nullable vars. When you declare a nullable var you have to write like that: var myVariable : String? = null Would be much more readable if we could just...

Date/time best practices for Kotlin Native @bnlv wrote: Is there a best practice we can apply for retrieving the current system date and time in Kotlin Native? We are unable to import java.util.Date and are not really sure if this is even the correctly path to take. What is the os.time() equivalent for Kotlin Native? Posts: 1 Participants: 1 <a...

Setting up Kotlin-Native App @nbaklanov wrote: Hi, everyone I am trying to learn how to setup project for crossplatform client development using Kotlin-Native. I looked into Fullstack application example in CLion. This template using CMake, but the iOS project build phases commands are using gradle and looking for gradlew file which is not where. I need to create it on my own (if yes when how I should do it) to make client part?...

anyOf equivalent of Kotlin Deffered @vach wrote: Coroutine async returns Deferred and there are example of lazy execution and usages of await. However how can we wait for any of the Deffered instances to complete? In a nutshell // whats the equivalent of CompletableFuture.anyOf(...)? // is this how we do it? if so how costly is this? select { deffered1.onAwait {} deffered2.onAwait {} } Posts: 1...

Retrieve default parameter value via reflection @nwh wrote: Given this example: data class Example(val abc: Int = 100) How would I be able to tell the default value of abc is 100 via reflection? Assume I have the KProperty instance already. Posts: 1 Participants: 1 Read full topic

Multi Platform project with JVM typealias - strange error message @nimloth05 wrote: I have the following common code declaration: expect open class Observable {} With a JVM Implementation like this: actual typealias Observable = rx.Observable Now I have an interface in my common code, with the following method: interface OrcaSource { fun observeModelStore(): Observable } If I try to implement this interface in the JVM package I get the following error: “Return...

All-open plugin and compile alert @vrossello wrote: Hi, I have this simple inheritance: @Named class SomeClass : SomeBaseClass("hi") open class SomeBaseClass(val someProperty: String) It compiles and works fine. However, when I have no-arg compiler plugin I get a warning: SomeClass.kt: (6, 7): Zero-argument constructor was not found in the superclass I understand the warning, however I would like to remove it. Shouldn’t no-arg compiler...

Create Iterator from suspendible function @dastultz wrote: Hello, I have a need to create an Iterator where the values come from a suspendible function. I seem to be having trouble navigating main and coroutine contexts. Here’s a toy example: package com.opentempo.specification import kotlinx.coroutines.experimental.channels.Channel import kotlinx.coroutines.experimental.launch import kotlinx.coroutines.experimental.runBlocking import...

"suspend" an issue when working with ktor + Exposed @dnene wrote: I am attempting to use ktor and exposed together. With ktor, the entire handler for a route is a suspendable function suspend PipelineContext.(TSubject) -> Unit to be more precise. Within that I am performing multiple database calls using kotlin which obviously require these to be wrapped by a Kotlin transaction{ ... } which is not marked as a suspend. I could perhaps wrap the transactions inside...

Kotlin JS client example @alamothe wrote: Hi there, I’m looking into building a web client (based on React) using Kotlin JS So far I figured there are two possible approaches that people follow: Use Kotlin WebPack plugin - and don’t use Gradle Use <a href="https://github.com/Kotlin/kotlin-frontend-plugin" rel="nofollow...

Kotlin JSONObject$Null Bug @geertberkers wrote: Hey, Im new here, so sorry if i posted this in the wrong section! I just found this bug for Kotlin while using the org.json library. When JSON returns null, it gives a JSONObject$Null While checking for null, == fails, and .equals warns to use == My code: fun testNullJSON(jsonObject: JSONObject, valueKey: String){ val jsonArray = jsonObject.getJSONArray(valueKey) for(i in 0 until...

Will Jetbrains think of a Kotlin-to-Java converter? @duckladydinh wrote: Hello all, one of the strong point of Kotlin, in my opinion, is that it can be automatically and magically generated from Java source code. When working in an existing code base, it it super important since I can easily copy and paste the old similar code in Java. However, isn’t it better if there is a reverse tool for converting Kotlin to Java? Above all, the biggest problem is that...

KotCity: open source city builder in Kotlin @kotcity wrote: Hey all… we have been having a lot of fun making a city building simulator / game in Kotlin. A lot of people said JVM/Kotlin was no good for games but it’s been going really well so far. We are finding Kotlin really productive and the project is going really smooth so far. The project is about 3 months old and we already have several contributors and we’re all hacking away and having fun....

Anko and Intents @rickster21 wrote: Does anyone have a good source that has an example of using intents to start a new activity using Kotlin with Anko? It will be much appreciated! Posts: 1 Participants: 1 Read full topic

Ts2kt: Union &amp; Intersection types? @alamothe wrote: Hi guys, I’m looking a bit deeper trying to understand if Kotlin for JS is ready for production use cases. Specifically, I’m using ts2kt to convert TypeScript definitions of some supporting React libraries such as Redux, Apollo etc. Unfortunately, these definitions are plagued by union and intersection types (as well as Partial), and they seem very common in JavaScript/TypeScript (<a...

Sequence chunk or window with predicate? @smallufo wrote: Say if I have a file containing a long list of family data , starting with F (father) , M (mother) , and optional unknown length S (son) , D (daughter) data , like this : F ... M ... S ... F ... M ... S ... D ... F ... M ... S ... S ... S ... I want to parse this file into a data structure containing father , mother , and list of children… val iStream: InputStream =...

Error reading ALL the numbers of the favorite contacts @hasan.oryx wrote: I’m trying t read ALL the numbers of my favorite contacts as below: I’ve 3 favorite contacts, each one with 2 numbers, so I need to read the 6 numbers, my code is: import android.annotation.SuppressLint import android.content.Context import android.provider.ContactsContract import android.provider.ContactsContract.Contacts.CONTENT_URI import...

Help my project @dbfdbhj wrote: i want make app i have project i want ask i want registration page with firebase and i want make anther part of data by mysql - php can i make part of project by firebase and anther part of project by mysql php Posts: 1 Participants: 1 Read full topic

Handling files in multi-platform projects? @jaccozilla wrote: Is there any support for file handing in multi-platform projects? Something similar to java.io.File. I didn’t find anything in the standard library. https://github.com/Kotlin/kotlinx-io looked promising, but does not have a File class. Posts: 1 Participants: 1 <a...

Idea how to fit collection literals into language @Konstantin-Khvan wrote: Sorry if there was this one already Consider introducing operators createList, createMap etc Provide Default implementation which will be imported Since they are operators user can override them on per file(just don’t import default one) and per type basis fun GlobalScopeOrSmthng.createList(vararg elements:Any?) = listof(*elements) fun...

Kotlin with java9 module @jerem44 wrote: Hi, I have seen that kotlin 1.2 can now use java libraries build with java9 and having modules. Is it plane in Kotlin to have the possibility to create modules too ? Or is it already the case ? Thanks Posts: 1 Participants: 1 Read full topic

Android Extensions not support flavorDimensions @sw926 wrote: build.gradle is like this android { defaultConfig { ... flavorDimensions "app", "type" ... } ... productFlavors { app1 { ... } app2 { ... } production { ... } internal { ... } } ... } Android Extensions not recognize ‘src/app1Internal/res’...

Osiris - library for serverless web apps on AWS @chriskent wrote: Hi all I’ve released a library for building serverless web apps on AWS using Kotlin, with a focus on simplicity and ease of use. It aims to make building a serverless web app as simple as one that runs in a traditional server. The HTTP endpoints and request handling logic are defined using a simple DSL. There is a Maven archetype and a Gradle to generate the initial project. And there are...

Lambda not working as expeccted @igm125 wrote: package moreorless.ian fun unaryOperation(x:Int, op:(Int) -> Int){ } fun outsideFunction() { for (number in 1…30){ unaryOperation(20, { x-> println(number) x * number }) } } fun main(args: Array) { outsideFunction() } does not print 1 2 3 etc only if i add println(x) after the for loop outside lambda ? why? Posts: 1 Participants: 1...

Kotlin Script API @ice1000 wrote: I’m trying to get the Class instance created by the KotlinToJVMBytecodeCompiler's compileScript method: private fun compileScript( scriptPath: String, scriptDefinition: KotlinScriptDefinition, runIsolated: Boolean = true, saveClassesDir: File? = null ): Class? { val messageCollector = PrintingMessageCollector(System.err, MessageRenderer.PLAIN_FULL_PATHS, false) val rootDisposable =...

How to write generic functions for all numeric types? @maurocchi wrote: I would write the following function able to work with all the numeric types (not only longs): fun nonNegativeDifference(previous: Long, current: Long): Long = if (previous < current) current - previous else current Is there a way to write it without to declare all the overloads? I’ve tried to do the following but this kind of constraint is not supported: fun...

Recursive generic in builder pattern @vagran wrote: I asked this question on StackOverflow without any suggestion. Currently I worked around it by using Java file in Kotlin project. Here is the question: I just want to port the following code from Java which uses Log4j (v2.8.2): ConsoleAppender appender =...