kotlinlang #announcements

Hi everyone, I wrote a simple annotation processor for generating equals methods that ignore specified field names. In case anyone finds this useful, it's here: https://github.com/tomtau/kotlin-equals-ignoring-fields

GarouDan

05/23/2018, 1:04 PM

Hi guys. I’m using the library Fuel for Kotlin: https://github.com/kittinunf/Fuel It’s very nice. But I was wondering, instead of doing some complex code like we usually did in JavaScript before, Kotlin (or can we find a way) to use some kind of `await`operator? https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/await For example:

val (request, response, result) = await "<http://httpbin.org/get>".httpGet().responseString()

instead of

val (request, response, result) = "<http://httpbin.org/get>".httpGet().responseString() // without await and thread blocking

GarouDan

05/23/2018, 1:29 PM

wow, very nice, It’s what I’m looking for. I need to know how to enable this or check if it is enabled

frellan

05/23/2018, 6:15 PM

Hi, i have a question I can’t find the answer to I want to pass a function as a parameter, but I want to aswell send some parameters with that function, except one, that should iterate

frellan

05/23/2018, 6:18 PM

A named function but also with parameters

Trent Telfer

05/23/2018, 7:47 PM

Hey guys, I’m trying to compile a project and am running into an issue where gradle (using kts) is complaining about my target JVM. Does anyone know how I would tell gradle (using kts) to target 1.8 instead of 1.6?

warriorprincess

05/24/2018, 5:12 AM

fun mergeTwoLists(l1: ListNode?, l2: ListNode?): ListNode? { var k1: ListNode? = l1; var k2: ListNode? = l2; var head: ListNode? // interleave head = k1; k1 = k1?.next while (k1?.next != null && k2?.next != null) { head?.next = k2; head = head?.next head?.next = k1; head = head?.next k1 = k1.next; k2 = k2.next // why no '?' necessary? because checkced above already? } // rest of elems from longer one var rest: ListNode? = if (k1?.next == null) k2 else k1 while (rest?.next != null) { head?.next = rest; head = head?.next rest = rest.next } return head } }

diesieben07

05/24/2018, 9:34 AM

val myList = listOf(1)
val myNewList = myList + 2 // [1, 2]

👍🏼 1

diesieben07

05/24/2018, 11:34 AM

Kotlin always passes by value. But if you "store an object in a variable" you are only storing a reference, that reference will then be passed by value.

👍 1

zmarkan

05/24/2018, 2:16 PM

hey everyone, I’m currently prepping the State of Kotlin report (maybe you’ve seen the survey floating in the first few months of the year) Currently working on a piece of visualisation and looking to get some feedback on it. I’m mostly interested in whether this approach works for the data I’m trying to visualise. Don’t worry about the design specifics(colours and shapes) - it’s just a concept at the moment. Any feedback would be much appreciated. Cheers! https://imgur.com/Ci7kDJb

Alowaniak

05/24/2018, 2:32 PM

is it possible to set a function as being a function of some other variable? e.g.

class A { val x = X(); fun foo(some: Bar) = x::anotherFooAlsoAcceptingOneBar; }

karelpeeters

05/24/2018, 6:57 PM

And you can edit messages :)

karelpeeters

05/24/2018, 7:01 PM

Isn't the actual issue that the length should be

j - i + 1

Nicolas Chaduc

05/25/2018, 7:51 AM

Hey, how can I write same in kotlin of that swift code :

if let valueCatchNotNull = valueCanBeNull {
} else {
}

we can catch value not null with

?.let

but can’t use else

karelpeeters

05/25/2018, 7:54 AM

val copy = value
if (copy != null) {} else {}

Nicolas Chaduc

05/25/2018, 8:18 AM

what do you think about two extensions :

fun ifLet(value: Any?, code: ((Any) -> Unit)): Boolean {
    value?.let {
        code.invoke(it)
        return true
    }
    return false
}

fun Boolean.elseLet(code: () -> Unit) {
    if (!this) {
        code.invoke()
    }
}

for use :

ifLet(myMutableValue, {
            System.out.println("Call of ifLet Code myInt value = $it")
        }).elseLet {
            System.out.println("Call of elseLet Code")
        }

brabo-hi

05/25/2018, 10:18 AM

is there a kotlin jvm network api ? or we have to use the Java one ?

adjorno

05/25/2018, 11:43 AM

how to set coroutine context to Deferred?

brabo-hi

05/25/2018, 11:58 AM

i'm wondering is there is any tool to convert html to kotlin DSL? if not, can we start an open source project for that ?

jackjill

05/25/2018, 1:31 PM

http://shitcode.net any contributions?

orangy

05/25/2018, 1:41 PM

:thread-please:

🙇‍♂️ 1

Paul Woitaschek

05/25/2018, 1:41 PM

I was hoping to be able to use @Parcelize on the sealed class but that doesn't seem possible

Paul Woitaschek

05/25/2018, 1:51 PM

Okay so I keep my serialization centralized

Paul Woitaschek

05/25/2018, 1:54 PM

Is there a solution for that or do I need to add sth like

readEnumNullable

robstoll

05/25/2018, 2:15 PM

What would you do in this case

val dowNotNull: DayOfWeek = parcel.readEnum<DayOfWeek>()

if readInt() returns 0? I think you need two implementations anyway

diesieben07

05/25/2018, 3:16 PM

Doing

thing as Int?

shows "useless cast"

diesieben07

05/25/2018, 3:17 PM

Will do.

samir

05/25/2018, 3:17 PM

Should this work without including <SomeInterface> ?

interface SomeInterface
enum class SomeEnum: SomeInterface { ValueA, ValueB }

fun someFun(array: Array<SomeInterface>) {}

fun calls() {
	val val1 = arrayOf<SomeInterface>(SomeEnum.ValueA, SomeEnum.ValueB) // Array<SomeInterface>
	val val2 = arrayOf(SomeEnum.ValueA, SomeEnum.ValueB) // Array<SomeEnum>
	val val3 = SomeEnum.values() // Array<SomeEnum>
	val val4 = SomeEnum.values() as Array<SomeInterface> // Array<SomeInterface>
	
	someFun(arrayOf(SomeEnum.ValueA, SomeEnum.ValueB)) // Works
	someFun(SomeEnum.values()) // Compiler error
	
	someFun(val1) // Works
	someFun(val2) // Compiler error
	someFun(val3) // Compiler error
	someFun(val4) // Works
}

tschuchort

05/25/2018, 5:55 PM

have you tried ::class? 🤔

lucasqueiroz

05/26/2018, 3:32 AM

Hey everyone! First of all, I want to introduce myself. I'm Lucas, a Software Developer from Brazil. Second, would #general be the place to ask questions about coding? Or is there a specific channel for that?

👋 3

Title

lucasqueiroz

05/26/2018, 3:32 AM

👋 3

Shawn

05/26/2018, 3:34 AM

most folks are out of the office or are otherwise not looking a Slack by now, so you probably won’t get much of a response

#general is for general questions about Kotlin specific, and most folks would prefer that you stay on topic

check out the channel listing by clicking

Channels

in the left sidebar, as well as the Common Channels section of the Kotlin Slack Code of Conduct (which you agreed to when making an account)

https://kotlinlang.org/community/slackccugl.html

lucasqueiroz

05/26/2018, 3:36 AM

Oh my question is about Kotlin, not about other languages

Shawn

05/26/2018, 3:36 AM

but the general ones I’d recommend are #getting-started, #codereview, and #random

feel free to ask away then

tipsy

05/26/2018, 7:04 AM

this channel or #getting-started

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