# root package

#### package root

This is the documentation for the Scala standard library.

#### Package structure

The scala package contains core types.

scala.collection and its subpackages contain a collections framework with higher-order functions for manipulation. Both immutable and mutable data structures are available, with immutable as the default. The parallel collections provide automatic parallel operation.

Other important packages include:

- scala.actors - Concurrency framework inspired by Erlang.
- scala.io - Input and output.
- scala.math - Basic math functions and additional numeric types.
- scala.sys - Interaction with other processes and the operating system.
- scala.util.matching - Pattern matching in text using regular expressions.
- scala.util.parsing.combinator - Composable combinators for parsing.
- scala.xml - XML parsing, manipulation, and serialization.

Many other packages exist. See the complete list on the left.

#### 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 providing by the underlying platform. For example, on the JVM, String is an alias for java.lang.String.

Visibility

1. Public
2. All

### Value Members

1. #### package scala

   Core Scala types.