Kotlin doesn't use `void` or `Void`, it uses `Unit...

# getting-started

[kevinmost]

Kotlin doesn't use void or Void, it uses Unit. You want logic: (g: Graphics) -> Unit

[jamie-purchase]

ah ok and just ignore the return content and don't worry about what Unit might be then?

[jamie-purchase]

cheers

[Shawn]

I’m not sure what you mean by “ignore the return content”. If you type the lambda as returning Unit, it can’t return anything

[Shawn]

if it returns null, then that’s not returning Unit

[jamie-purchase]

it's ok i'm new to Kotlin and wasn't familiar with what Unit is - i've caught up now

This type corresponds to the void type in Java.

https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html

[kevinmost]

Unit is a Kotlin object so it's a singleton, and only one exists. Kotlin implicitly does return Unit similar to how Java does for void

[kevinmost]

Right, important distinction is that null is not of the type Unit. Unit is a non-nullable type so null does not fit in there

[jamie-purchase]

i've abandoned my thoughts about null (that was just a Java way of explaining my question) and it's working fine with Unit

[jamie-purchase]

should have said "function that returns void" instead of null, sorry

[Shawn]

no worries, just a little confusing considering void functions can’t return null either 😅

[jamie-purchase]

quite right. I spend my days writing web applications in ColdFusion - a language built on the JVM but without null support - i'm allowed to say the wrong thing occasionally when I spend my spare time using proper languages, right? 😉

[Shawn]

oof, that’s a name I haven’t heard in a long time haha

[jamie-purchase]

haha it's either "what's that?" or "is that still alive" when you drop it

[madorb]

it had literally no idea coldfusion runs on the jvm.

[madorb]

i guess though, last time i knew someoe actively using it was 1999 and it wasn’ ton the JVM at that point 😄

[jamie-purchase]

well i've only been using version 10 and upwards (released on May 15, 2012 according to wikipedia)
it's cool being able to do things like var buffer = createObject("java", "java.lang.StringBuffer"); to dip into java classes and use them in cfml
the language is still miserably behind most modern developments but thanks to the lucee.org (open source cfml engine) and https://www.ortussolutions.com/products/commandbox (CLI and package management) we are slowly getting there
there is support for lambas but buggy, static modifiers and generics are still nonexistent

[jamie-purchase]

you can load external JARs as well so it's entirely possible to utilise methods/classes written in Scala/Clojure/Kotlin and pass them around like cf objects, it's all JVM at the end of the day

[jamie-purchase]

but enough of that i'm here to get away from CF haha @madorb