This library provides instances for several Scalaz typeclasses.
In order to use this library, we need to add the following line in our build.sbt
file:
libraryDependencies += "dev.zio" %% "zio-interop-scalaz" % "7.3.3.0"
import scalaz._, Scalaz._
import zio.interop.scalaz._
type Database = IList[User]
def findUser(id: UserId): ZIO[Database, UserError, User] = ...
def findUsers(ids: IList[UserId]): ZIO[Database, UserError, IList[User]] = ids.traverse(findUser(_))
Due to Applicative
and Monad
coherence law ZIO
's Applicative
instance has to be implemented in terms of bind
hence when composing multiple effects using Applicative
they will be sequenced. To cope with that limitation ZIO
tagged with Parallel
has an Applicative
instance which is not Monad
and operates in parallel.
import scalaz._, Scalaz._
import zio.interop.scalaz._
case class Dashboard(details: UserDetails, history: TransactionHistory)
def getDetails(id: UserId): ZIO[Database, UserError, UserDetails] = ...
def getHistory(id: UserId): ZIO[Database, UserError, TransactionHistory] = ...
def buildDashboard(id: UserId): ZIO[Database, UserError, Dashboard] =
Tag.unwrap(^(par(getDetails(id)), par(getHistory(id)))(Dashboard.apply))
def par[R, E, A](io: ZIO[R, E, A]): ParIO[R, E, A] = Tag(io)
Learn more on the ZIO Interop Scalaz homepage!
For the general guidelines, see ZIO contributor's guide.
See the Code of Conduct