in anyway I am trying anything, so my question is, can I transform the second parameter of

getRecipes

in a lambda?

Somebody saw my question https://kotlinlang.slack.com/archives/C0922A726/p1578555871055500 ?, is it better to create a new delegation class and implement in our way

How do i extract different data from the binary representation of an int? There are mode, sadc, badc, and gain(pg0, pg1), brng. I want to read/write them , and if possible change some binary digit, like changing 11th and 12th digits only or 8th 9th and 10th, and so on with/without reading/parsing like that.?

i'm trying to rewrite my test names which contain parens (like ``myMethod() works`()`) - is there a simple way of finding these tests?

is it possible to

get

the first of a list of possible keys from a map -- for example if the keys might not always be exact:

personMap.getFrom("lastname", "LastName", "last_name", "nameLast")

?

Can this be considered a Kotlin Vulnerability that if a

var name=<lambda>

is declared in a class, its returning value can be modified for a particular instance?This instance can be passed on to other functions which would end up with wrong data. I thought kotlin lambdas are supposed to be a clean looking replacement for functions, but functions do not change their logics. For eg:

I'm wondering if there is a way to delegate an interface using

by

keyword and make all the delegated methods

final

. My use case is as follows:

interface MyInterface {
    fun doSomething()
}

internal class MyInterfaceImpl : MyInterface {
    override fun doSomething() {
        // Do something here
    }
}

abstract class MyClass : MyInterface by MyInterfaceImpl() {
    abstract fun doSomethingElse()
}

class MyClassImpl : MyClass() {
    override fun doSomethingElse() {
        // Do something here
    }

    override fun doSomething() {
        // This override should be forbidden
        super.doSomething()
    }
}

I have a question about domain modeling and nullable fields, let's say I have (simplified example)

data class Application(val applicantName: String?, val dateOfBirth: LocalDate?, val status: ApplicationStatus)

"demo" is from https://kotlinlang.org/docs/reference/typecasts.html Can anyone please let me know why "demo2" is not working?

Just a raw thought:

sealed class A

class X : A()
class Y : A()
class Z : A()

From what I've seen usually people do this to be able to write something like

class Service {
  fun returnSomething(a: A) = when(a) {
    is X -> /* ... */
    is Y -> /* ... */
    is Z -> /* ... */
  }
}

Isn't it an illustration of an OOP anti-pattern, though? Shouldn't it have been something along the lines of:

Service {
  fun returnSomething(a: A) = a.returnSomething()
}

Anytime you find yourself writing code of the form "if the object is of type

T1

, then do something, but if it's of type

T2

, then do something else," slap yourself!

— Scott Meyers, Effective C++

Hey Guys I wrote this article few months ago. Hope it will help https://medium.com/tapdevs/part-1-clean-gradle-files-gradle-dependencies-group-bd9bb33c81cf

I am using kotlin with mysql. I have a string stored in mysql DB as : Apple's . However when I hit the rest api to read the string, it is displayed in logs as Apple \u2019. Why do my logs display the unicode character? Also on terminal, i see it as \u2019.

Hello! Kotlin's framework design convention says to set visibility modifiers & return types explicitly. Should I do same in the tests of the library?

Is this a bug or am I missing something?

fun <T> List<T>.idk(): List<T> = TODO()
fun <T> List<T>?.idk(): List<T>? = TODO()

fun lol() {
	val real: List<String> = emptyList()
	val empty: List<String>? = emptyList()
	
	real.idk() // Resolves the first function.
	empty.idk() // Only safe (?.) or non-null asserted (!!.) calls are allowed on a nullable receiver of type List<String>?
}

(Sorry about the names, they take up too much time to come up with) This only happens when the receiver is generic. The functions resolve as expected for

String

.

I need to know

elapsedNow()

from a time point that I receive from an api...

Hello, World! Hey, I often have functions of the form

fooBar(a: Int? = null, b: String? = null, c: String? = null)

where actually either a, b or c should be non null. Is there an idiomatic way to do this? I think Sealed classes would work, but a bit cumbersome. I've also seen people talking about an Either type (there's one in Arrow). Thoughts?

Question on the kotlin-bom. It looks like the scopes aren't properly set in it.

<dependency>
   <groupId>${project.groupId}</groupId>
   <artifactId>kotlin-test</artifactId>
   <version>${kotlin.version}</version>
</dependency>

Same with kotlin-reflect(which I belive should be scope of

reflect

). Is this intentional or an oversight?

Quick stupid question... trying to learn Kotlin by coding some codewars challenges, and how to convert mutableListOf("abc", "def", "ghi").map { it.length } to an Array<Int>?

How to idiomatically unwrap multiple optionals (without nesting)?

does anyone know if coroutines and serialization libraries are gradle metadata compatible yet ?

Hello! How can i execute task at a specific time with Kotlin? Wich way is better?

This message was deleted.

You can't be that desperate...

Hi there. I have a lot of ids across my android app, which are just strings. Would it be a good practice to use typealias in the following manner:

typealias Id = String

Thanks!

In Kotlin's interfaces with default implementations, there's no way to constrain the interface to a specific implementation / access it, right? Edit: Here's a snippet in Swift of what I mean. I'm almost sure it's not possible in Kotlin, but just want to confirm (and see what alternative can be used)

protocol ChildViewController where Self: UIViewController { // <--ChildViewController is "interface" and it's constrained to a specific class

    func foo()
}

extension ChildViewController {

    func foo() { <-- this is basically default interface implementation
        print(self.view) <-- here we access a field of the concrete type, i.e. UIViewController
    }

}

Is there a reason for the smart cast not happening when using

.not()

instead of

!

?

Does Kotlin have an option to get a list of all enums that are in a class. Not values, but names? I couldn’t find one. Then, through an extension function?

I have this code. How to make it jump out of while loop? I mean what should be input? I have entered nothing and just pressed the enter button but it takes it as string. And I also tried 0 and it did not work. "this line" never being printed to console. any ideas?

fun main(args: Array<String>) {
    var line = readLine()
    while (line !=null) {
        println(line)
        line = readLine()
    }
    println("this line")
}

Is there a policy how long the kotlin runtime is supported, similar to the jdk support policy?