What approaches and methods are used for error handling in Kotlin coroutines?

In Kotlin, there are several approaches to error handling in coroutines:

1. try-catch inside a coroutine — the simplest way to handle exceptions. You can wrap code inside launch or async in a try-catch block.

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

2. CoroutineExceptionHandler — a special handler that can be passed into the coroutine context. It catches unhandled exceptions in coroutines launched via launch.

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

GlobalScope.launch(handler) {
    throw RuntimeException("Error")
}

3. Error handling in async/await — when using async, exceptions are not thrown immediately but upon calling await(). Therefore, await() should be wrapped in a try-catch.

val deferred = async {
    // code
    throw Exception("Error")
}

try {
    deferred.await()
} catch (e: Exception) {
    // error handling
}

4. SupervisorJob and SupervisorScope — allow isolating errors of child coroutines so that one error does not cancel the entire parent scope.

Thus, the choice of method depends on the context and the type of coroutine (launch or async).