@roberto.guerra unfortunately at this point it's too late to add appendices to the book, but we do plan to provide a Kotlin style guide as a separate online document

that would be great

i’m half way through the book btw. It is pretty good.

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Hey everyone! One of the editors over at Manning Publications here. We're pretty interested in producing a video course on Kotlin under our new liveVideo banner. Svetlana and Dmitry are sadly too busy to work with us on something, so I was wondering if anyone in here happened to have any interest in being involved?

Hi everyone! I want to translate the book "Kotlin in action" into Russian and publish on my website. Can I legally do that?

unfortunately not. the rights to the book text belong to Manning, the publisher of the book. as far as I know rights to the Russian translation have been acquired by DMK Press (http://dmkpress.com/)

So in the book, it talks about using Sequences when you have a large data set so you don’t incur the larger memory in dealing with each filter map function compared to using a standard List or Iterable. In my gist https://gist.github.com/simon-tse-hs/7dce88df4c0870b8d580205c587ea6ac I wrote some code to average out over 1000 iterations of running filter map from 100-1,000,000 times

@yole , I’m not sure why this is the case, but List came out on top for larger sets on average instead of smaller sets of 100.

>> fun squareNumbers(range: CollectionRange): List<Int> = range.rangeList.filter { it % 3 == 0 }.map { it * it }.filter { it % 4 == 0 }.map { it * 3 }.filter { it % 4 == 0 }

fun squareNumbersSequence(range: CollectionRange) = range.rangeList.asSequence().filter { it % 3 == 0 }.map { it * it }.filter { it % 4 == 0 }.map { it * 3 }.filter { it % 4 == 0 }.toList()

I’d filter{}.map{}.filter{}.map{}.filter{} as the list of operations. Can you tell me maybe why this might be the case?

hi guys, just i'm a beginner to kotlin progra, any one can explain what is the difference between abstract and interface in kotlin?

Hi guys. I’m studying kotlin and I’m on type projection section. What I miss?

open class Noun(val n: String)
open class City(val c: String) : Noun(c)
open class Cabrobro(val j: String) : City(j)

fun <T> copyData(source: MutableList<T>, destination: MutableList<in T>) {
    for (item in source) {
        destination.add(item)
    }
}

fun main(args: Array<String>) {
    val source= mutableListOf(City("c1"), City("c2"), City("c3"))
    val destination= mutableListOf<Cabrobro>()
    copyData(source, destination)
}

Hi guys, anyone on?

Just tried to build the code samples in the master branch of https://github.com/kotlin/kotlin-in-action repo with Kotlin 1.3.21. It turns out it’s not that straightforward as it seems to be. I would like to submit a PR that contains gradle related changes so that we can build code samples with Kotlin 1.3.21. Thoughts?

Hello guys, I have a question related to "how to set the textcolor for all the textview inside the constraint layout at once?" Example: I have 10 textviews inside constraint layout. And based on some condition I have to change all the textview's textcolor. Rather than add textView1.setTextColor, textView2.setTextColor....textview10.setTextColor() ...do we have any other way to handle this ? Thanks in advance 🙂

@svtk, @yole , @elizarov, I'm loving the second edition MEAP. Can I request you to please share some idea of when you believe the book would be finished? Are you awaiting release of Kotlin 2.0?

Got this in the mail today! Can’t wait to dive right in

Got my copy today!