coroutineScope { // Now you are in scope }

Hello all. I'm a beginner trying to learn something more advanced that the very basics. I got a question about "by lazy" assignment. Premising that one of the reasons to use a lazy assignment is to avoid making a val or var nullable in case you can't assign it a value right there right now (there are other reasons to defer it; but this is a common one). That being said, is it possible to lazily assign something which may actually return null to a nullable variable? Hope the question is clear. Thanks!

This. What is (and am I) missing here? Thanks so much ❤️

Hello. Is there a migration guide for coroutines 1.0.0? That’s pretty weird to have it experimental for year+ and then release a totally different implementation without deprecation and backward compatibility.

What is the easiest way to determine if

list

contains items with the same value (we don’t know what value it may be). Is there any operator or combination fo operators to achieve this ? eg `

listOf("A", "A", "A")  //true
listOf("A", "A", "B")  //false
`

The reason that I'm asking is that we have such use-case, parse JSON and doesn't know the type of generics so we need to use

Operator<*>

. Jackson automatically parse the string into the appropriate class for that Operator so we're sure that it will work. What's the alternative approach to this use-case in Kotlin?

Is there a minimum gradle version for kotlin 1.3?

Hello, any ideas how can i get the class of a generic parameter?

abstract class Behavior<T> {
    fun getData(entity: Entity): T {
        return entity.getData(T::class)
    }
}

Got

Cannot use T as reified type parameter

Hello, I am new to kotlin and I was wondering if there is a way to destroy kotlin object so init block is reinitialized. This is for testing purpose?

I use lambda expressions/anonymous classes in my app (for example, for onClickListener) but it leads to memory leaks and nullifying all them seems to be pain. I was wondering if there is a laconic way that I could use instead lambda expressions/anonymous classes but without creating static classes for every case?

Again, what exactly do you nullify?

I wonder if Kotlin will have sumBy and sum for List<BigDecimal> in the future? Useful in banking system, and one does not have to write his own:);)

Answer is probably no but is there a way to either • reset a lateinit property back to null? • do it myself with a getter that returns non-null with

!!

and a setter that accepts null?

Will Kotlin get syntax for list, set and map creation

Or list = [[1, 2, 3]] for mutable ones

set = {1, 2, 3} mutableSet = {{1, 2, 3}}

Hi - I’m experimenting with

sequence {}

but getting “Restricted suspending functions can only invoke member or extension suspending functions on their restricted coroutine scope”. I can’t seem to find any information about this. Any pointers please? https://pl.kotl.in/B1hRgy_2m Presumably I need to use a suspending extension function of CoroutineScope?

I’m really confused, in the Primitives.kt file in the kotlin stdlib, the minus function for Bytes is as follows:

/** Subtracts the other value from this value. */
    public operator fun minus(other: Byte): Int

Note: This is inside the byte class.

I remember someone already proposed this some time ago as part of the language

still would require you to make them delegated properties from the start

i get lazy and observable and quite a few others, but I did wonder what was going on with

by cssclass()

is that really just a wrapper around some sort of lazy type opperation?

so, what is currently the best working code coverage tool for kotlin other than using idea itself ? that is not possible in github checks afaik inlined calls, extension functions and suspend functions are rather random in their coverage in jacoco

no idea where to ask this, but I am experimenting with inline classes. Quite awesome feature imo, except

toString

does not seem consistent (given my understanding that inline classes are substituted with their member) given

inline class ProjectUid(val projectUid: String)
println(ProjectUid("test"))

the output is

ProjectUid(projectUid=test)

, I would have expected only

test

. This "breaks" some libraries (simple workaround is to inline myself) am I misundersting something? is this behavior expected?

So i have thoroughly been enjoying learning Kotlin for the past month or so, but now I find myself routinely forgetting semicolons when i go back to java, js, or ts 😞

when I execute this code, I expected to get a "false" but instead, I always get true. Not sure what I am doing wrong.

metrics.timer(timerName, successTag).time {
                throw IllegalArgumentException("Stop")`

Guys, if we are using an annotation that need to receive a string parameter, how could we assign the value on a way to work with kotlin? For example

@Bean("MyBean") // works, but
@Bean(MyBean::class.simplaname) // don't work, since the annotation says something like `An annotation argument must be a compile-time constant`

Is there a way to contour this? Since the annotation will be compile-time constant to me. I would like do something like these to create a lot of dynamic values when using annotation classes.

Hello What can be changed with

BroadcastChannel

? Now it is marked as

experimental

I don’t recommend it, but yeah