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