when

with

// scala
sealed trait Test[+A] {
   …
   def test[B >: A]: B
   …
}

// kotlin
Sealed class Test<out A> {
   …
   fun <A : B> test(): B.   // <— this is problem
   …
}

fun <A, B> test(): B where A: B

override fun toString(): String {
    return super.toString()
}

Pair

Triple

data class Point(val x: Int, val y: Int)

Map<String, (Int)->Boolean>

Map<String, (String)->Boolean>

Map<String, (Any)->Boolean>

Map<String, *>

Map<String, Any?>

Map<String, (Any?)->Boolean>

scala> case class Something[T](something: T)
defined class Something

scala> Something(1)
res0: Something[Int] = Something(1)

scala> res0.copy(something = "something")
res1: Something[String] = Something(something)

data class Something<T>(val value: T)
Something(1).copy("something")

import kotlinx.coroutines.delay

suspend fun first(a: Int): Int {
    delay(100)
    return a + 1
}

suspend fun testMap(a: Map<String, Int>): Int {

    a.forEach { key, value ->
        first(value)
        println(value)
    }

    return 0
}

suspend fun testList(a: List<Int>): Int {

    a.forEach {
        first(it)
        println(it)
    }

    return 0
}

jvmTarget

> Task :some-android-lib-module:compileDebugKotlin FAILED
e: Unknown JVM target version: 1.7
Supported versions: 1.6, 1.8

SQLDelight

inline

object

1.3.21

java.lang.IllegalStateException: Resource not found in classpath: kotlin/coroutines/coroutines.kotlin_builtins

catch

File

catch