How to convert function output to Unit with Kotlin

Question

I have troubles with a function in Kotlin that should return Unit, but due to a usage of another function returning a Boolean, there is a type mismatch.

Here is a co

Answer 1

I think you should change return type of function to optional, it's more clear, like below:

fun printAndReturnTrue(bar: Int): Boolean {
    println(bar)
    return true
}

fun foo(bar: Int): Unit? = when(bar) {
    0 -> println("0")
    else -> printAndReturnTrue(bar) as? Unit
}