kotlinlang #getting-started

i have doubt in kotlin rangeTo() and downTo() are two functions if i apply reverse to 1 function i will get same result as another then why need two functions

mohita

07/21/2017, 9:27 AM

Can anyone please explain this?

marior

07/21/2017, 9:34 AM

Hi guys, I am trying to make REST API with Spring in Kotlin using Android Studio and deploy to Tomcat server. Project works fine on IDE gradle server, but final .war file does´t run on Tomcat server. Any suggestions?

danielsan

07/21/2017, 4:30 PM

Where could I look up more advances use cases of Kotlin’s delegates / delegated properties? Are there some parts of the stblib where they are more heavily used? Or perhaps some 3rd party lib? Thanks!

mat

07/22/2017, 1:09 PM

Advice on Learning Kotlin Android... What the take Learning it; - w/o java knowledge - w/ little java knowledge Thanks..

ivano

07/23/2017, 5:35 PM

plus you know you are going to pile up memory in the Heap!

robsonj

07/23/2017, 10:09 PM

As someone new to Kotlin - c# dev. I was wondering what the preferred testing framework is for Kotlin please?

jkbbwr

07/23/2017, 11:10 PM

Have you set runtime retention

danneu

07/23/2017, 11:36 PM

is there a way to do something like

when (v) { > 60 -> true }

pike

07/24/2017, 2:44 AM

~~is there a page for streams in kotlin?~~ found a good SO on it

👍 1

techie01

07/24/2017, 6:43 AM

can i use 100..10

techie01

07/24/2017, 9:37 AM

val a=null val b=null println(a==b) what is the o/p for this

damian

07/24/2017, 7:32 PM

The signature of the

get

operator is

operator fun get(key: K): V?

, where

null

is returned if the key is not found.

karelpeeters

07/24/2017, 7:37 PM

You can also do this this to avoid the unsafe !! operator using the elvis operator and `let`:

fun main(args: Array<String>) {
    val map = mutableMapOf<String, Int>()
    val lst = mutableListOf<Int>()
    map["answer"] = 42

    for (arg in args) {
        map[arg]?.let { 
            lst.add(it)
        }
    }
}

rrmen

07/25/2017, 6:04 AM

how can I understand higher order functions/lambas more?

techie01

07/25/2017, 6:11 AM

i am getting short is deprecated then what to use now

dalexander

07/25/2017, 1:09 PM

It’s an extension function that can be called on a StringBuilder object, and which returns nothing. So if you have some

val sb: StringBuilder = ...

you could call

sb.configure()

techie01

07/25/2017, 3:51 PM

how to install kmongo

thisen

07/27/2017, 8:33 PM

What does

!!

operator do?

💥 4

danneu

07/28/2017, 1:31 AM

you know, i kinda like swift's feature

fun foo (_a a: Int) { return _a + _a }

and thus

foo(a = 42)

where you can name an argument differently for the callsite

karelpeeters

07/28/2017, 9:34 AM

@hb2708 Please don't post the same thing in different channels (and even twice in the same channel), it just adds noise.

techie01

07/28/2017, 10:48 AM

how to use "let" and what is importance of it

horse_badorties

07/30/2017, 8:22 AM

Hi there 🙂 why does Kotlin need

Array

in the first place? Why not use

Collection

and let the compiler optimize them away as JVM Arrays where possible?

ziad

07/30/2017, 11:21 AM

Hi all, I keep getting "Unresolved reference" when writing unit tests for a class I'm actively developing even though the imports are there and intellij isn't complaining. If I build or hit run from Intellij, I get compilation errors. The errors only disappear of I build via gradle. What am I missing here?

oday

08/01/2017, 10:43 AM

is there a cool new flashy kotlin way to iterate over 2 lists of the same size in Kotlin?

oday

08/01/2017, 7:41 PM

Handler().postDelayed(
        { Timber.d("Testing") }, 100)

rockerhieu

08/02/2017, 4:05 AM

What is the shortest & safest way to add items from a subList to another list?

srcList.subList(from, to).mapTo(destList) { convert(it) }

subList

may throw IndexOutOfBound, doesn't it?

Title

rockerhieu

08/02/2017, 4:05 AM

What is the shortest & safest way to add items from a subList to another list?

srcList.subList(from, to).mapTo(destList) { convert(it) }

subList

may throw IndexOutOfBound, doesn't it?

diesieben07

08/02/2017, 7:19 AM

Not sure what you are trying to achieve, do you want

to

and

from

to be constrained to the list's size automatically if they are too large?

rockerhieu

08/02/2017, 7:30 AM

I just want to make the above line more concise without raising IndexOutOfBoundException

diesieben07

08/02/2017, 7:30 AM

What do you want to happen in case the indices are out of bounds though?

rockerhieu

08/02/2017, 7:30 AM

swallow the exception

diesieben07

08/02/2017, 7:31 AM

Yes, but what should the value of the expression be?

rockerhieu

08/02/2017, 7:31 AM

keep

from

, minimize

to

diesieben07

08/02/2017, 7:31 AM

And if

from

is out of bounds? 😄

rockerhieu

08/02/2017, 7:32 AM

ok, let me change it to

srcList.take(count)

diesieben07

08/02/2017, 7:32 AM

take

never throws 😉

🍺 1

rockerhieu

08/02/2017, 7:32 AM

nice, let me check 👍

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