What's the equivalent of Swift's fatalError() in Kotlin

Issue

Say I want to do sth like

val foo = when(bar) {
   "one" -> true
   "two" -> false
   else -> // in Swift it would be `fatalError()`
}

How do I do it?

I'm aware that there are generally better approaches to this kind of problem, but I want to know how to easily induce a crash in Kotlin too :)

Solution

You could throw an exception. This will bubble up the call stack until somebody handles it or you run out of stack frames and the application crashes.

val foo = when(bar) {
   "one" -> true
   "two" -> false
   else -> throw IllegalArgumentException("$bar is Unknown")
}

I just used IllegalArgumentException here, but you might want to define your own.

Answered By - Todd