kotlinlang #announcements

var recipients: MutableList<String> = mutableListOf()
    var recipient: String
        set(recipient: String) {
            recipients.clear()
            recipients.addAll(recipient.split(";"))
        }
        get() = recipients.joinToString(";")

dumptruckman

02/07/2019, 4:15 PM

nothing to do with json

adam-mcneilly

02/07/2019, 4:16 PM

Why not just do

recipients = listOf(mySingleRecipient)

at the call site?

adam-mcneilly

02/07/2019, 4:17 PM

The proxy sounds good from an abstraction point, but I fear you might over engineer yourself into a corner with too many moving pieces.

dumptruckman

02/07/2019, 4:17 PM

Eh, just attempting to make a equally nice api in both kotlin and java. Though I’m realizing I need to avoid

i think for this to behave like a java builder pattern

👍 1

dumptruckman

02/07/2019, 4:18 PM

is there some way to support both?

dumptruckman

02/07/2019, 4:19 PM

direct access for kotlin and a method that returns the builder object for java?

Robert

04/09/2019, 8:11 PM

When I run

gradle build

in my project in IntelliJ IDEA, it runs fine (errors, but nothing special). But when I try to run a test in that same project by click on the green

run

-icon next to the test-method, it gives me this error:

Error:java: javacTask: source release 8 requires target release 1.8

Seems like it runs JUnit tests not in the same way as gradle build? What should I change? I annotated it with

@kotlin.test.Test

and have

useJUnitPlatform()

in my gradle.build.kts in the test-section. How should I run tests fom IDEA?

karelpeeters

04/09/2019, 8:48 PM

You need something like this in your `build.gradle`:

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compileKotlin {
    kotlinOptions.jvmTarget = "1.8"
}
compileTestKotlin {
    kotlinOptions.jvmTarget = "1.8"
}

Robert

04/09/2019, 9:30 PM

Should i use

kotlin.test.*

io.kotlintest.*

Bas Dalenoord

04/10/2019, 8:16 AM

I've got a problem when running a mapper in my unit tests... running the mapper at runtime isn't a problem at all, but during my unittests (lateinit vars)

result.a

and

result.b

remain uninitialized... Anyone with an idea?

Untitled.kt

Bas Dalenoord

04/10/2019, 8:16 AM

It seems as if the apply block isn't executed at all, but by setting the value through the debugger I can make my tests succeed without any problem... I expect the values of my

Result.a

and

Result.b

to be the same as

toMap.a

and

toMap.b

Smallville7123

04/10/2019, 11:18 AM

for example:

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/**
 * @sample foo
 */
fun a() {}
fun foo() {
val a: ArrayList<String>
}

will print

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preprocessor.utils.core.classTools instanceChain.kt
public fun a(): Unit

Samples: foo
                val a : ArrayList

🧵 1

Smallville7123

04/10/2019, 11:19 AM

var a: MutableList<B>

is making the rest of my function's text bold

🧵 1

amadeu01

04/10/2019, 4:20 PM

does anyone knows one implementation of SIP/Voip in pure kotlin ?

Hullaballoonatic

04/10/2019, 5:52 PM

It'd be nice to have python's sublist syntax in kotlin At the moment you can accomplish some of it like this:

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operator fun List<Int>.get(range: IntRange) = subList(range.start, range.endInclusive - 1)

val foo = listOf(1,2,3,4)
val bar = foo[0..2] // [1,2,3]

But I think

foo[1..]

and

foo[..3]

would be great too, even though you can accomplish them each with a single list method, this looks nicer imo That would require the

rangeTo

operator to create unbounded ranges, though, but I think it'd be nice to have that, too. Thoughts?

Hullaballoonatic

04/10/2019, 5:55 PM

It might be slippery slope toward list literals and comprehensions, though i know JB has toyed with the idea (no pun intended)

karelpeeters

04/10/2019, 5:58 PM

You can borrow a bit more from Python:

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object Ellipsis

class SliceUntil(val index: Int)
class SliceFrom(val index: Int)

operator fun Ellipsis.rangeTo(index: Int) = SliceUntil(index)
operator fun Int.rangeTo(ellips: Ellipsis) = SliceFrom(index)

operator fun <T> List<T>.get(slice: SliceUntil): List<T> = ...
operator fun <T> List<T>.get(slide: SliceFrom): List<T> = ...

list[Ellipsis..2]
list[2..Ellipsis]

karelpeeters

04/10/2019, 5:59 PM

Might want to find a better name for

Ellipsis

, maybe

Edge

or something like that.

ghedeon

04/10/2019, 6:01 PM

[Would be nice having partial ranges in kotlin...] they have it in swift, you know...

karelpeeters

04/10/2019, 6:02 PM

Actually wait what even is

[..2]

supposed to do? Isn't that just

[0..2]

Hullaballoonatic

04/10/2019, 6:02 PM

Well, in the kotlin compiler. As shown by myself and Karel, you can create your own extension functions for partial ranges in the languages, it just isn't as pretty

Hullaballoonatic

04/10/2019, 6:03 PM

and therefore matches the syntax for

[1..]

Hullaballoonatic

04/10/2019, 6:03 PM

i'm just literally replacing the python

[:]

with

[..]

user

04/11/2019, 8:00 AM

https://twitter.com/kotlin/status/1116249502594158592 You can use

when

statements as expressions. They offer a series of benefits, including a check for exhaustiveness #KotlinTips https://t.co/GQROGKo7Fh https://t.co/KfXsdTLADw Twitter

👍 4