kotlinlang #announcements

yeah I just looked at the generated bytecode and both cases generate the same stuff (although it might be different with an actual use case, but I doubt it)

fred.deschenes

12/13/2018, 8:58 PM

it also made me realize that the Kotlin compiler generates a call to check that the "args" supplied to main aren't null, which is kind of useless 😛

karelpeeters

12/13/2018, 8:58 PM

It makes it impossible to call the function in contexts where you don't have a reified type available.

☝️ 2

karelpeeters

12/14/2018, 8:56 AM

list.sortBy { it.tide }

lawlorslaw

12/14/2018, 8:57 AM

its actually an ArrayList

lawlorslaw

12/14/2018, 8:57 AM

there is no

sortBy

its

sortedBy

karelpeeters

12/14/2018, 8:59 AM

My bad, of course you can't actually sort a readonly list. Maybe you wanted

MutableList

lawlorslaw

12/14/2018, 9:00 AM

so ArrayList is a read only list?

lawlorslaw

12/14/2018, 9:01 AM

i just tried

tides.toMutableList().sortBy { it.tide }

but the same exception is thrown?

karelpeeters

12/14/2018, 9:02 AM

Do other Kotlin stdlib functions work?

lawlorslaw

12/14/2018, 9:02 AM

maybe the problem is this doesnt work in the watches tab in the debugger

lawlorslaw

12/14/2018, 9:06 AM

so it doesnt crash when i try to run that code

lawlorslaw

12/14/2018, 9:06 AM

but it doesnt look like it sorts the mutablelist either

jkbbwr

12/14/2018, 9:07 AM

Can we see the full traceback and minimal reproduction please?

lawlorslaw

12/14/2018, 9:07 AM

how do i do that

lawlorslaw

12/14/2018, 9:07 AM

ive never heard of those terms

jkbbwr

12/14/2018, 9:09 AM

https://stackoverflow.com/help/mcve http://sscce.org/ Basically, paste your stacktrace entirely, and try to give some runnable code that creates that stacktrace.

lawlorslaw

12/14/2018, 9:09 AM

this worked

val sortedTides = tides.sortedBy { it.tide }

lawlorslaw

12/14/2018, 9:10 AM

thanks for the help

blogscot

12/14/2018, 7:02 PM

Here’s my build.gradle

Copy code

buildscript {
  ext.kotlin_version = '1.3.11'
  repositories {
    mavenCentral()
  }
  dependencies {
    classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
  }
}

apply plugin: 'kotlin'

repositories {
  mavenCentral()
}

dependencies {
  compile "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"

  testCompile 'junit:junit:4.12'
  testCompile "org.jetbrains.kotlin:kotlin-test-junit:$kotlin_version"
}
test {
  testLogging {
    exceptionFormat = 'full'
    events = ["passed", "failed", "skipped"]
  }
}

serebit

12/14/2018, 7:06 PM

change

kotlin-stdlib

kotlin-stdlib-jdk8

Alan Pierri

12/14/2018, 8:58 PM

fun <P,Q> ExampleClass.asdf<P,Q>(name: String): OtherExampleClass<P,Q>

Is there any way I can accomplish this?

karelpeeters

12/14/2018, 8:59 PM

What is the second

<P,Q>

doing there?

Shawn

12/14/2018, 8:59 PM

Just omit the

<P,Q>

from the function name, that seems like it’d give you a syntax error

Alan Pierri

12/14/2018, 9:00 PM

thx!

xenoterracide

12/15/2018, 5:37 PM

Copy code

interface Identified<ID : Serializable> : Persistable<ID> {

    var id :ID?

    @JsonIgnore
    override fun isNew() : Boolean {
        return this.id == null
    }

    fun sameIdAs( that : Identified<ID> ) : Boolean {
        return this.id == that.id
    }
}

https://docs.spring.io/spring-data/commons/docs/current/api/org/springframework/data/domain/Persistable.html How do I fix this issue that the IDE is showing?

karelpeeters

12/15/2018, 5:38 PM

Actually override the function, `val`s don't count

xenoterracide

12/15/2018, 5:42 PM

@karelpeeters but when I do that it does this