Can anyone recommend where to read up on current best practices for asynchronous requests? Should I look into co-routines and observables as well? Essentially, I want to build an async request library that's as fast as possible and can scale as needed. Where can I find out more about the state of the art?

is anyone able to help me understand this question I posted on SO? https://stackoverflow.com/questions/49620173/why-does-kotlin-kclasst-have-a-bound-generic-type-of-any

This:

constructor(
    title: String,
    portions: Int,
    sections: List<ClassA>,
    sourceUrl: String? = null
  )

and this:

constructor(
    title: String,
    portions: Int,
    ingredients: List<ClassB>,
    sourceUrl: String? = null
  )

Apperently have the same JVM signature, why is that? Can’t it see that

ClassA

and

ClassB

are two different classes in the list? I did not know that two lists with different content looked the same to the bytecode

yep, I have it in dependency.

Has anyone used SBT alongside Kotlin? I was taking a look at https://github.com/pfn/kotlin-plugin (as my team likes using SBT and was thinking about smallest migration path) but it doesn’t seem to work any more.

is there a way to get the start position of a MatchResult as it is possible for java.util.regex.Matcher?

Yes but trying to emulate it I think I got an error declaring stuff in

kotlin.internal

Just tried it out and it actually does work for me. So... I'll stick with it for now...

Is it considered okey to define JUnit tests like this:

@Test 
fun `do something here`() {

}

What's a simple and cool testing framework for kotlin?

Question: Where should one declare typealiases exactly? I want to use that alias everywhere in my code I guess, where do I define an alias? What is a common pattern?

Are the individual lines really too long to be read at once?

Hey all, quick question as I can't find any solid resources for this. How does one test extension methods? Say I have something like

fun Date.isWeekend() = day == 6 || day == 7

Inside a class. How do I go about unit testing this?

the same way you would a method with the signature

fun isWeekend(date: Date): Boolean

And without a double lazy implementation!

lazyGey

is redundant,

get

is already lazy.

Ie. return the previous instace if it exists and otherwise create a new one and remember it.

Sorry for the potentially silly question, but if i make an extension property by delegate... Where does delegate's data get stored? Do i create one delegate that just operates on generic receiver? Or does it results in new instance being produced for every receiver? How exactly does that all work?

Hi Kotlin folks! I’m trying to parse a hexadecimal color. Input is

String

like

"0xFF3F51B5"

and I need to use it in

button.setBackgroundColor(int: Int)

. I’ve tried

Integer.decode(hexString)

and

hexString.toInt(radix = 16)

but no success. Looks like there’s an overflow: https://youtrack.jetbrains.com/issue/KT-4749 Please help. Thanks 🙂

And I've just realised I can use default parameters to achieve what I want, I think 🙂

I don’t understand the primary constructor solution. Lemme try

hexString.toLong(16).toInt()

meanwhile 👍

isn’t it for avoiding overloading

in this case your example is nasty because ({}) implicitly sets the first non-default parameter, and in the {} case it's using the last lambda parameter.

We'd like to just check if propertyId is set, and if it isn't then get the propertyId of the

property

object.

@snowe You need to use

field

to access the backing field, not the actual field.

Someone knows how to do it?

WHat is the difference between

Open

and

Submitted

issue status on youtrack (Kotlin issue tracker)?

Can I call a function with a reified type when I have the class?

I want to write a test that checks if a property I have is a certain type. The property is a sealed class, so I want to write something like:

fun assertNetworkStateType(clazz: Class<*>) { assertTrue(networkState is clazz) }

so that I can call it like

assertNetworkStateType(NetworkState.Loading)

but I can't quite figure out what the type of that parameter would be.