is there a multi-platform way to check if a variab...

# announcements

[Robert Jaros]

is there a multi-platform way to check if a variable (of type Any) is a function/lambda? v is Function<*> works on JVM, but doesn't work on JS platform

[gildor]

Really curious why do you need to know that

[gildor]

As I understand (tho it may be wrong), It works on JVM only because of implementation details of Kotlin lambda and method reference on JVM, so it’s more like implementation detail, so it doesn’t work for other platforms
Nope, I was wrong, Function<*> should work, I thought it was kotlin.jvm.functions. Actually now it looks like a bug, because check that type is functional type makes a lot of sense for me

[Robert Jaros]

https://github.com/reduxkotlin/redux-kotlin-thunk/blob/master/lib/src/commonMain/kotlin/org/reduxkotlin/Thunk.kt
This project uses this, but it doesn't work on JS, where I need it. I could try to repair this, but I don't now how to do it.

[Robert Jaros]

Probably just cast to function type could be enough. It works correctly on JS and JVM.

[dmitriy.novozhilov]

check KFunction in kotlin.reflect
https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.reflect/-k-function/index.html

[Robert Jaros]

@dmitriy.novozhilov how does it help?

[dmitriy.novozhilov]

v is KFunction<*> doesn't work?

[Robert Jaros]

no, it doesn't
neither on JS nor JVM

[gildor]

@Robert Jaros Now I see, it’s really unfortunate.
But by checking original code I don’t have enough confidence, but wouldn’t be better just check for Thunk type? I mean of course it may be some other functional type, but probably just propagate would be better, because now it essentially throws exception on any type with Function interface which doesn’t look correct