how to break from lambda passed to recursive function when provided condition met

Question

I am writing a custom loop dsl and I want it\'s usage to look like below

    var counter1 = 0
    var counter2 = 0
    loop {
            counter1          


        

Answer 1

It can be done for example with throwing a lightweight exception. You have to declare custom exception:

class LoopStopException : Throwable("Stop look", null, false, false) // lightweight throwable without the stack trace

and catch it in loopWithoutDelay:

private suspend fun loopWithoutDelay(block: suspend () -> Unit) {
    try {
        while (true) {
            block()
        }
    } catch (e: LoopStopException) {
        //do nothing
    }
}