``` fun tests start Int end Int IntArray = start until end t kotlinlang #functional

Channels

100daysofcode

100daysofkotlin

100daysofkotlin-2021

androidgithubprojects

cincinnati-user-group

competitive-programming

event21-community-content

java-to-kotlin-refactoring

jvm-ir-backend-feedback

kotlin-multiplatform-contest

kotlinultimatechallenge

myndocs-oauth2-server

naming

navigation-architecture-component

practical-functional-programming

proguard

prozis-android-backup

refactoring-to-kotlin

russian-kotlinasfirst

skia-wasm-interop-temp

stayhungrystayfoolish

swagger-gradle-codegen

tricity-kotlin-user-group

Title

simon.vergauwen

12/23/2018, 12:53 PM

fun tests(start: Int, end: Int): IntArray =
 (start until end).toList().toIntArray()

Hexa

12/23/2018, 12:55 PM

thanks, so I have to convert it to a

List

first and then

Array

? Isn't that expensive?

simon.vergauwen

12/23/2018, 12:58 PM

Ye, it's how Kotlin collections work unfortunately. In

Scala

they have a special system with implicit classes which makes it more flexible.

toArray

is defined on

Collection

so only way to do it without writing any custom code is this. If you are worried about performance I would definitely write a custom extension method on

IntRange

to convert

toIntArray

directly.

Hexa

12/23/2018, 1:20 PM

thanks @simon.vergauwen

simon.vergauwen

12/23/2018, 1:22 PM

Anytime :)

4 Views

#functional Join Slack