scalaz.zio
The Async class describes the return value of an asynchronous effect that is imported into an IO value. Asynchronous effects can return values synchronously via returning now, or promise to invoke a callback via returning later.
Async
IO
now
later
The
Asyncclass describes the return value of an asynchronous effect that is imported into anIOvalue. Asynchronous effects can return values synchronously via returningnow, or promise to invoke a callback via returninglater.