if there is anyone in or around New Mexico, USA created a new channel #new-mexico

Thoughts on adding a safe indexed access operator? Ala foo?[i]. My use case would be chaining in some nested structure. foo?[i]?[j]?[k]

You'll need to come up with a different syntax,

foo?[i]

already means

foo?.get(i)

.

There's also

getOrElse

, https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.collections/get-or-else.htm, or even

getOrNull

, https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.collections/get-or-null.html.

@karelpeeters

foo?[i]

already means

foo?.get(i)

It doesn't though:

class Zeros {
    operator fun get(i: Int): Int? {
        return 0
    }
}

fun main(vararg args: String) {
    val zeroes: Zeros? = Zeros()
    zeroes?[0] // Unexpected tokens (use ';' to separate expressions on the same line)
}

Really? I didn't know that, thanks.

I'll submit it

Try #language-proposals first, see what the devs think about it.

There's an open ticket for it: https://youtrack.jetbrains.com/issue/KT-19168

That's funny, I was imagining @joelpedraza wanted something that guards against​ indexoutofbounds. Then it would be a bit inconsistent to use

?[]

.

@Ruckus I kept searching using the wrong keywords.

Is there a method that returns whether any of the items in a list match the given predictate? I could check whether the result of

find

isn't null but I wonder if there's a buildin.

Have you try

any

?

Hello guys, someone know companies that use Kotlin Server-Side in Production? (Corda and Jetbrains dont count :)

Pintrest.

Actually there are some examples at the bottom of the homepage: https://kotlinlang.org/

Pinterest use it in server side too? Or only in android application?

In docs there are 2 companies that using in server side: Jetbrains and Corda. I try find another companies that use it in server side.

If you search

kotlin pintrest

there's a lot of articles and videos maybe you can find something.

Thanks for the information @karelpeeters but i think that piterest use it only in Android and i trying find examples of server-side.

a more extensive list, similar to Rust's "Friends of Rust" (https://www.rust-lang.org/en-US/friends.html), would be great. My company would love to be on that list on the Kotlinlang site 😆

Hi! I've a beginner question concerning a little Kotlin script, in which I use the

with

function on an object I created. When I try to execute it, I get the error message Expecting a top level declaration. All is OK if it is included in a

main

function. What is the explanation? Thanks.

You can't put expressions at the top level, only declarations.

It doesn't work if I start with a class declaration. For example:

class User(var username: String) {
    fun addFriend(friend: String) {}
}

val user = User("Bertrand")
with(user) {
    username = "Alice"
    addFriend("Bob")
}

Right,

class

and

val

work because they're declarations, but

with

is an expression so it doesn't work.

Thank you! My goal is to compare Kotlin with and Groovy with.

@karelpeeters You would need

apply

there, with

also

you'd have to do

it.userName = "Alice"

and so on.

hey! I have a koltlin function which Parameters have default values, now i am using this function(class member function) in a java class, how do i invoke this function, with telling it to take the default parameter value, just passing null?

If you add the annotation

@JvmOverloads

it generates a bunch of methods with different parameters left out, they use the default arguments.