kotlinlang #getting-started

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getting-started

forcelain

03/04/2018, 1:38 PM

I have a data class

data class Item(
        val children: List<Item>
}

is there a way to make a deep (recursive) copy of such an object?

item.copy()

creates a copy of the top object only but not the

children

sourabhv

03/05/2018, 1:08 PM

So AndroidStudio is not suggesting anything. Great.

sourabhv

03/05/2018, 1:11 PM

And I get a warning to downgrade to

1.2.21

🤷‍♂️ 1

dierre

03/06/2018, 9:23 AM

Hello, I found an annoying behaviour here (https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.collections/first.html), if the array is empty it is thrown a

NoSuchElementException

. I found that I can obtain what I want using filter and then checking against list size. I was expecting to return a `T?`(meaning an optional of some kind) instead of

. So basically instead of doing

list.first({p -> predicate}).orElse(defaultObject)

I have to do something like

var result = list.filter({p -> predicate}); if(result.isEmpty()) return defaultObject else result.first()

. Do you think there is a better approach?

03/06/2018, 1:38 PM

Hello guys, Can any one please answer the following question https://discuss.kotlinlang.org/t/how-does-tolist-function-works/6905 🙏

➕ 1

Giulio

03/11/2018, 12:06 AM

Hi! Can someone help me with this? Is there a simple method to transform the following

responseBody =  myTask.get();

into an async callback?

Tarun

03/13/2018, 11:01 AM

Hey Should we use annotations(Like @NonNull or @Nullable) with function arguments in kotlin to specify if function arguments are NonNull(Asking because of Null type handling in Kotlin being different) For Example

fun callApi(@NonNull context: Context) : String{
        return "hello world!"
    }

cody.stringham

03/13/2018, 2:56 PM

Hey all, web developer here looking to learn me some kotlin for greater good. Does anyone have a recommendation for a framework to get started with? I've been pointed to https://javalin.io/ but wanted to ask the pros - also worth mentioning I have absolutely no java background.

Regan Russell

03/13/2018, 9:39 PM

why can I not have an enum class inside an inner class..??

poohbar

03/15/2018, 2:30 PM

I would disagree with Kaidan here and maybe many others. I think Kotlin is not a good language to learn unless you have a decent understanding of Java. It really makes perfect sense if you know Java and liked Effective Java but some parts of the language make very little sense if taken out of context (of Java).

👍 7

oday

03/16/2018, 9:50 AM

what could possibly cause a filter operation not to be run? I mean the list is there and it gets successfully sorted by name through a comparator I have set

bartek.t

03/16/2018, 9:57 AM

Is @Parcelize stable at the moment?

chi

03/19/2018, 6:43 AM

Yeah @Shawn I'm just saying that, since there's the IDE feature with a language Kotlin is interoperable with (Java), why isn't it with Swift on intellij

Sobri

03/19/2018, 6:57 AM

is kotlin native just an experimental or will it be ready for production?

jchannon

03/19/2018, 2:36 PM

Anyone used http://www.functionalkotlin.com/ ?

Andreas Sinz

03/20/2018, 8:42 PM

@diego-gomez-olvera https://intellij-support.jetbrains.com/hc/en-us/articles/206544839-How-to-manage-projects-under-Version-Control-Systems

edwardwongtl

03/21/2018, 5:28 AM

Oh then you can go to #rx

Thanos Psaridis

03/21/2018, 12:00 PM

Hello guys Kotlin noob here. I have declared some top level functions inside

Utils.kt

file which I'm calling them in another class but how can someone else find out that those functions reside in the

Utils.kt

file just by reading at my code? If you ctrl+click on function IntelliJ takes me to the

Utils.kt

file but how can I do that without the help of the ide?

mbickel

03/21/2018, 4:47 PM

Doesn't look awfully optimized for memory, but my applications only do trivial amounts of values in each dimension.

alexandretaz

03/21/2018, 7:26 PM

Guys I'm writing an app to my son's cell send me his location every minute I searched that I can do it using foreground service is there any tutorial explaining how to do that with Kotlin

alexandretaz

03/22/2018, 6:12 PM

Hello i'm creating a system that shoud create a service when the user open the main activity, this service configure a timer so every 10 seconds hi sends a a post to a http server. Even if it's on bg

jchannon

03/22/2018, 10:58 PM

Are there any projects aimed at teaching kids Kotlin?

sandeep

03/23/2018, 5:04 AM

/** Property */
    PROPERTY,
    /** Field, including property's backing field */
    FIELD,

zpearce

03/23/2018, 9:11 PM

I have a java class with a bunch of static methods on it. Is there a way to use kotlin's

with()

against that?

with(MyJavaType) {}

complains about MyJavaType not having a companion object.

kristofdho

03/24/2018, 12:40 AM

so give it a regex

it.matches(Regex("\.[abc]\."))

👍 2

benleggiero

03/24/2018, 2:15 AM

So… what are the

_main

modules? They aren’t mentioned on https://kotlinlang.org/docs/reference/multiplatform.html

https://i.imgur.com/s0HnpUk.png▾

pal0810

03/25/2018, 1:39 PM

can anyone recommend me a fast track course for android using kotlin. ps: wanna build an online laundry platform

sarna

03/26/2018, 5:21 PM

alright, I'll try to find something 👍 thanks

oday

03/29/2018, 6:42 AM

I’m using Codacy for code quality, I get this message about my injection code http://snpy.in/rsWGMm

Gerard Klijs

03/29/2018, 10:37 AM

I’m calling some clojure from kotlin, would it be idiomatic to put it all in a spring component, and use that fro the interactions? This way I have the non-type-safe stuff all in one place, other code can use the ‘typesafe’ functions from the component?

Title

Gerard Klijs

03/29/2018, 10:37 AM

nfrankel

03/29/2018, 11:01 AM

no experience but that would be interesting perhaps when it works, you would be able to write a blog post about it?

Gerard Klijs

03/29/2018, 11:06 AM

I probably could, but for now I just try to build a little thing in Kotlin from clojure, also using avro and postgress, with some data types like UUID. It’s for an internal workshop about event sourcing.

👍 1

nfrankel

03/29/2018, 11:08 AM

have fun!

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