How is error handling carried out within CoroutineScope in Kotlin?

Error handling in CoroutineScope in Kotlin is done using exception mechanisms and special error handlers.

Main methods:

1. try-catch inside a coroutine You can wrap the coroutine code in a try-catch block for local exception handling.

launch {
    try {
        // code that may throw an exception
    } catch (e: Exception) {
        // error handling
    }
}

2. CoroutineExceptionHandler This is a special handler that can be passed into the coroutine context for global handling of unhandled exceptions in coroutines launched via launch (but not async).

val handler = CoroutineExceptionHandler { _, exception ->
    println("Caught $exception")
}

val scope = CoroutineScope(Dispatchers.Main + handler)
scope.launch {
    throw RuntimeException("Error")
}

3. Error handling in async In the case of async, exceptions are not thrown immediately but when calling await(), so error handling should be there.

val deferred = async {
    throw RuntimeException("Error")
}
try {
    deferred.await()
} catch (e: Exception) {
    // handle
}

Thus, the choice of method depends on the type of coroutine and the desired level of error handling.