Task[A] is a type alias for
ZIO[Any, Throwable, A], which represents an effect that has no requirements, and may fail with a
Throwable value, or succeed with an
Let's see how the
Task type alias is defined:
type Task[+A] = ZIO[Any, Throwable, A]
Task just equal to
ZIO which doesn't require any dependency. Its error channel is
Throwable, so it may fail with
Throwable and may succeed with an
In Scala, the type alias is a way to give a name to another type, to avoid having to repeat the original type again and again. It doesn't affect the type-checking process. It just helps us to have an expressive API design.
Some time, we know that our effect may fail, but we don't care the type of that exception, this is where we can use
Task. The type signature of this type-alias is similar to the
Future[T] and Cats
If we want to be less precise and want to eliminate the need to think about requirements and error types, we can use
Task. This type-alias is a good start point for anyone who wants to refactor the current code base which is written in Cats
IO or Monix
Note: Principle of The Least Power
ZIOdata type is the most powerful effect in the ZIO library. It helps us to model various types of workflows. On other hand, the type aliases are a way of subtyping and specializing the
ZIOtype, specific for a less powerful workflow.
Lot of the time, we don't need such a piece of powerful machinery. So as a rule of thumb, whenever we require a less powerful effect, it's better to use the proper specialized type alias.
So there is no need to convert type aliases to the
ZIOdata type, whenever the
ZIOdata type is required, we can use the most precise type alias to fit our workflow requirement.