Scala 3

This is the documentation for the Scala standard library.

Package structure

The scala package contains core types like Int, Float, Array or Option which are accessible in all Scala compilation units without explicit qualification or imports.

Notable packages include:

Other packages exist. See the complete list on the right.

Additional parts of the standard library are shipped as separate libraries. These include:

  • scala.reflect - Scala's reflection API (scala-reflect.jar)

  • scala.xml - XML parsing, manipulation, and serialization (scala-xml.jar)

  • scala.collection.parallel - Parallel collections (scala-parallel-collections.jar)

  • scala.util.parsing - Parser combinators (scala-parser-combinators.jar)

  • scala.swing - A convenient wrapper around Java's GUI framework called Swing (scala-swing.jar)

Automatic imports

Identifiers in the scala package and the scala.Predef object are always in scope by default.

Some of these identifiers are type aliases provided as shortcuts to commonly used classes. For example, List is an alias for scala.collection.immutable.List.

Other aliases refer to classes provided by the underlying platform. For example, on the JVM, String is an alias for java.lang.String.


Members list


package scala

Core Scala types.

Core Scala types. They are always available without an explicit import.