Milestone

Any recommended Kotlin course for Android developers …. I am looking for some courses to share with my team. ( I hope this is the right channel )

What would be the kotlin way to write below code:

var toPlayer = players.random()
                while (toPlayer == fromPlayer) {
                    toPlayer = players.random()
}

I am not liking the multiple assignments + var here...

@Alec Muffett bitwise are only available for Int and Long

any reason why I can’t call this java method?

Here is some code which does not work. I suspect that the reason that it does not work is that

this

in the

buildString

lambda does not refer back to the

ByteArray

, but instead to the implicit

StringBuilder

which is being built, and I suspect that the

forEach

is inheriting its iterator from the inner

this

, rather than the (shadowed) outer

this

. HOWEVER: the code is cute, and I would like understand the problem to be certain, and to save the situation. Can I elegantly fix the shadowing problem in the existing code, rather than refactoring it to use a loop, or

with

or

apply

?

const val INT_TO_HEX = "0123456789ABCDEF"
fun ByteArray.toHexStringDoesNotWork() = buildString {
    forEach {
        val octet = it.toInt()
        append(INT_TO_HEX[octet.and(MASK_UPPER_NIBBLE).ushr(4)])
        append(INT_TO_HEX[octet.and(MASK_LOWER_NIBBLE)])
    }
}

something like

lists.chunked(size / n)

Hey guys. Does anyone know is it possible to access object property by it's name or KProperty dynamically? Like in JS

user["username"]

Hello there ! Thanks for inviting me around, Kotlin seems like a real good option for us. I actually have a question to start things off, just to avoid loosing time in an impossible project : We have a Web App, that allow us to do WebRTC video/audio call, we now need to have that same call displayed on a Google Assistant Smart Display (Lenovo 10"). So I have 2 questions : • Is it possible using Google Asssistant to transmit video/audio to the Smart Display • If yes, is it possible using Kotlin ? Thanks !

Hi. Do you know about good library for http client? I want to call external api via http client. My project is Spring boot (server side, not Android) I'm using https://github.com/square/okhttp now. Because there are some merits about performance. (e.g: Connection pooling, Transparent GZIP) There is another good library?

How do I create a property, if I don’t want it to be null, and don’t want to initiate a (default) value unless it is being called (unless manually a value has been set). Do I need field + getter + setter + private backing field? Or is there an easier way?

Why can’t I do this:

val myByte: Byte = 0;
val myInt: Int = 0;
myByte == myInt;

but CAN i actually do this?

myByte.compareTo(myInt) == 0;

Isn’t it the same?

Hi! I'm new to kotlin and android app development and I've been really interested in making apps. My question is if there is like a "list"/"guideline" of everything that I will need to learn in order to make an overall complete app. I was thinking of consulting this list then going to the documentation or code labs present in the developer's site and learn it from there. Is this method a good way to learn app development or is there a better way(in a free way)?

Hi all, I have a question about what would be a good way to implement a pattern where you have different components with responsibilities but the outcome of some may be an input of another component. I'm asking from the mutability/arguments perspective. E.g imagine a Chain of responsibility-ish (CoR) pattern where an object "Result" goes through multiple filters, each one generate an outcome based on some logic. This Result object is a complex object composed by some collections, other objects. Each Filter can add new pieces of information to the Result; and the order is important and can change. I'm wondering what would be a clean way to implement this in Kotlin. (Note that the computation is not stopped after the first processor handles the computation, it is reason I said CoR-ish) Some options I thought: • Common interface for filters with a Result class as an argument. Result as data class passed as argument in the call to each filter, inside I could clone and add new items but Clone is not deep so it wouldn't work with collections and more complex objects. • Do not use a data class but a normal class. I would have to implement getter and setter. I guess I could implement my own clone or use memory serialization/deserialization to force a deep clone (really don't want to do it) • Define specific Result Object per Filter so argument is inmutable. The main issue here is the order of execution can not be altered (it breaks the flexibility on the chain of responsibility pattern) Any suggestion or different approach? . Most of the examples I found for Single Responsibility in Kotlin does not cover the fact that the outcome from one filter may be needed in the next.

Hi All! So

SequenceInputStream()

takes a Java

Enumeration

as an argument, but at the moment I only have a `List<InputStream>`; there's a workaround for this described at https://www.pushing-pixels.org/2018/08/15/converting-list-to-enumeration-in-kotlin.html to provide a

List<T>.toEnumeration()

method, but I am wondering if there's something more elegant?

Hello there 👋, i am confused. I take user input then in the user input it might be "bot take rest" and I converted it to list, then I need to verify(put in if else statement) the first 9 words or if the 9 word is "bot take" or another command. How can I do that 9 words ?

This message was deleted.

When using mutableListOf() or any collections object ; If without using the generics we initialise it with different data types then it starts behaving as a mutable list ? But if I mention generics (<Any> in this case) explicitly only then it works why ? for ex: val list = mutableListOf(1,2,"hIM"); --> this will behave as a mutable list and will not be able add anything to the list. whereas val list = mutableListOf <Any> (1,2,"him"); --> This just works fine and work as mutable list .

Do I have to install any plugin?

A bit silly questions: if precision is not an issue, what is the pros & cons to use Float over Double in JVM target platform?

Hi! I have to call a service to get the status of a job after I have started it(so that I can set it as completed), and the service can use several minutes to complete the job. Is it a good idea to do this in a coroutine and then create another coroutine if the process is not done? Or should I do this another way? I need some kind of retry mechanism.

does

in

cause the runtime of the program to become as if it were 2 for loops O(n2)?

(This is longer than I hoped, sorry if I'm ranting too much here) I'm working on an app for a friend, it needs to run on android and a webapp on pc, the android app would be used to create/edit some data in a cloud database and the webapp would be used to generate reports from the data in the database, and sometimes edit things if needed. I did a quick demo app but I'm restarting because the code there was godawful, and now I'm trying to figure out what libraries to use and how to set the whole thing up properly. I'm a bit stuck figuring out the best way to do something like this. I can manage making a native android app and a webapp that both connect to a local database, I went to school for a couple years for software development and I've completed google's android kotlin fundamentals codelabs so I'm a rookie but I have a general idea of what to do for each seperate app. I'm mostly confused about connecting to a cloud database, since everything I've done so far is using a local database. Would using something like Kotlin Multiplatform be worth it here to reuse the backend logic for interacting with the database? I've been doing a ton of research and it seems like most of the KMP projects are for android/iOS and not android/webapp. I found KaMPKit as a starting point if I want to use KMP, and I was looking into ktor vs spring boot for the webapp/server side stuff. There's so many libraries/frameworks and different ways to do this that I'm stuck, anyone have some advice for an overwhelmed rookie? Thanks!

I am reading https://kotlinlang.org/docs/reference/using-gradle.html to setup Kotlin with Gradle currently. When specifying dependencies, the document introduces the syntax first, where one does specify the deplendencies especially for the Kotlin SourceSets only. Not the top-level dependency-block. Is there any reasoning behind this? Any advantage compared to 'just' specifying the dependencies directly at top-level?

What is the "kotlin way" of doing this: In Java you could throw checked exceptions, which would give you compile-time feedback letting you know where in your code you need to implement try/catch. So for example if you threw an exception in a method that's used in many places, the compiler will force you to handle where ever it is called. However in kotlin, exceptions are unchecked, so you do not get any compile-time feedback. You may accidentally miss some places where you need to try/catch. What is the "kotlin way" here?

https://kotlinlang.org/docs/reference/ Kotlin lastest version is 1.4.10. But I want refer to v1.3.72 docs, how do that? Help me. What link is kotlin old version docs?

Anyone from the kotlin documentation team? It is worthwhile for the users if you maintain separate documentation for 1.4.x and 1.3.x.

What is the default continuation indentation value in intellij?

Hi guys. Does Kotlin has any course website which similar like Laracast and VueMastery? It is focus driven on the particular item only.