This is the documentation for the Scala standard library. == Package structure == The [[scala]] package contains core types. scala.[[scala.collection]] and its subpackages contain a collections framework with higher-order functions for manipulation. Both [[scala.collection.immutable]] and [[scala.collection.mutable]] data structures are available, with immutable as the default. The [[scala.collection.parallel]] collections provide automatic parallel operation. Other important packages include: - scala.[[scala.actors]] - Concurrency framework inspired by Erlang. - scala.[[scala.io]] - Input and output. - scala.[[scala.math]] - Basic math functions and additional numeric types. - scala.[[scala.sys]] - Interaction with other processes and the operating system. - scala.util.[[scala.util.matching]] - Pattern matching in text using regular expressions. - scala.util.parsing.[[scala.util.parsing.combinator]] - Composable combinators for parsing. - scala.[[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.[[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.