This Scala standard module contains the package
scala.collection.parallel, with all of the parallel collections that
used to be part of the Scala standard library (in Scala 2.10 through 2.12).
For Scala 3 and Scala 2.13, this module is a separate JAR that can be omitted from projects that do not use parallel collections.
- https://docs.scala-lang.org/overviews/parallel-collections/overview.html
- https://javadoc.io/doc/org.scala-lang.modules/scala-parallel-collections_2.13
This module is community-maintained, under the guidance of the Scala team at Lightbend. If you are interested in participating, please jump right in on issues and pull requests.
To depend on scala-parallel-collections in sbt, add this to your build.sbt:
libraryDependencies +=
"org.scala-lang.modules" %% "scala-parallel-collections" % "<version>"In your code, adding this import:
import scala.collection.parallel.CollectionConverters._will enable use of the .par method as in earlier Scala versions.
This module is published only for the Scala 3 and 2.13, so in a cross-built project, the dependency should take this form:
libraryDependencies ++= {
CrossVersion.partialVersion(scalaVersion.value) match {
case Some((2, major)) if major <= 12 =>
Seq()
case _ =>
Seq("org.scala-lang.modules" %% "scala-parallel-collections" % "<version>")
}
}This way of testing scalaVersion is robust across varying Scala
version number formats (nightlies, milestones, release candidates,
community build, etc).
Using .par is problematic in a cross-built project, since in Scala
2.13+ the CollectionConverters._ import shown above is necessary, but
in earlier Scala versions, that import will not compile.
You may able to avoid the problem by directly constructing your
parallel collections rather than going through .par. For other
possible workarounds, see
#22,
which is still under discussion.
As with other Scala standard modules, build and release infrastructure is provided by the sbt-scala-module sbt plugin.
