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
In Scala, a 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 results of the type-checking process. It just helps us to have an expressive API design.
Let's see how the
Task type alias is defined:
type Task[+A] = ZIO[Any, Throwable, A]
Task is equivalent to a
ZIO that doesn't need any requirement, and may fail with a
Throwable, or succeed with an
Sometimes we know that our effect may fail, but we don't care about the type of that exception. This is where we can use
Task. The signature of this type alias is similar to
Future[T] and Cats
If we want to be less precise and eliminate the need to think about requirements and error types, we can use
Task. This type alias is a good starting point for anyone who wants to refactor an existing code base which is written with Cats
IO or Monix
ZIO data type is the most powerful effect in the ZIO library. It helps us to model various types of workflows. On the other hand, the type aliases are a way of specializing the
ZIO type for less powerful workflows.
Often, 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 appropriate specialized type alias.
So there is no need to convert type aliases to the
ZIO data type, and whenever the
ZIO data type is required, we can use the most precise type alias to fit our workflow requirement.