is it possible to use extension functions in

when

statements?

when(myObject) {
  myCustomExtensionFunctionOnMyObject -> do something
}

I believe you would have to use

when

expression without a subject (assuming the extension returns boolean)

val myObject = ...

when {
myObject.myCustomExtensionFunctionOnMyObject() -> do something
}

hmm, then multiple cases do not combine

yes it will, but I think you meant ||

you can also define a val in when:

when (val myObj = someProp.getSth()) {
    myObj.test1() -> //...
    myObj.test2() -> //...
}

might be handy for some use cases

Silly me, thanks @jaqxues