Is there an idiom for waiting for a Deferred and defaulting to null (or some predefined result)? I ...

# coroutines

[Pihentagy]

Is there an idiom for waiting for a Deferred and defaulting to null (or some predefined result)?

I have a Deferred, and needed its result or null.

[Sam]

Something like this?

deferred.join()
val result = if (deferred.isCancelled) null else deferred.getCompleted()

[Pihentagy]

Yes, something like that. Mine version is:

suspend inline fun <T> awaitOrNull(deferred: Deferred<T?>): T? = runCatching { deferred.await() }.getOrNull()

[Pihentagy]

or rather

private suspend fun <T> Deferred<T>.awaitOrNull(): T? = runCatching { this.await() }.getOrNull()