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This is the documentation for the Scala standard library.
== Package structure ==
The [[scala]] package contains core types like [[scala.Int `Int`]], [[scala.Float `Float`]], [[scala.Array `Array`]]
or [[scala.Option `Option`]] which are accessible in all Scala compilation units without explicit qualification or
imports.
Notable packages include:
- [[scala.collection `scala.collection`]] and its sub-packages contain Scala's collections framework
- [[scala.collection.immutable `scala.collection.immutable`]] - Immutable, sequential data-structures such as
[[scala.collection.immutable.Vector `Vector`]], [[scala.collection.immutable.List `List`]],
[[scala.collection.immutable.Range `Range`]], [[scala.collection.immutable.HashMap `HashMap`]] or
[[scala.collection.immutable.HashSet `HashSet`]]
- [[scala.collection.mutable `scala.collection.mutable`]] - Mutable, sequential data-structures such as
[[scala.collection.mutable.ArrayBuffer `ArrayBuffer`]],
[[scala.collection.mutable.StringBuilder `StringBuilder`]],
[[scala.collection.mutable.HashMap `HashMap`]] or [[scala.collection.mutable.HashSet `HashSet`]]
- [[scala.collection.concurrent `scala.collection.concurrent`]] - Mutable, concurrent data-structures such as
[[scala.collection.concurrent.TrieMap `TrieMap`]]
- [[scala.collection.parallel.immutable `scala.collection.parallel.immutable`]] - Immutable, parallel
data-structures such as [[scala.collection.parallel.immutable.ParVector `ParVector`]],
[[scala.collection.parallel.immutable.ParRange `ParRange`]],
[[scala.collection.parallel.immutable.ParHashMap `ParHashMap`]] or
[[scala.collection.parallel.immutable.ParHashSet `ParHashSet`]]
- [[scala.collection.parallel.mutable `scala.collection.parallel.mutable`]] - Mutable, parallel
data-structures such as [[scala.collection.parallel.mutable.ParArray `ParArray`]],
[[scala.collection.parallel.mutable.ParHashMap `ParHashMap`]],
[[scala.collection.parallel.mutable.ParTrieMap `ParTrieMap`]] or
[[scala.collection.parallel.mutable.ParHashSet `ParHashSet`]]
- [[scala.concurrent `scala.concurrent`]] - Primitives for concurrent programming such as
[[scala.concurrent.Future `Futures`]] and [[scala.concurrent.Promise `Promises`]]
- [[scala.io `scala.io`]] - Input and output operations
- [[scala.math `scala.math`]] - Basic math functions and additional numeric types like
[[scala.math.BigInt `BigInt`]] and [[scala.math.BigDecimal `BigDecimal`]]
- [[scala.sys `scala.sys`]] - Interaction with other processes and the operating system
- [[scala.util.matching `scala.util.matching`]] - [[scala.util.matching.Regex Regular expressions]]
Other packages exist. See the complete list on the left.
Additional parts of the standard library are shipped as separate libraries. These include:
- [[scala.reflect `scala.reflect`]] - Scala's reflection API (scala-reflect.jar)
- [[scala.xml `scala.xml`]] - XML parsing, manipulation, and serialization (scala-xml.jar)
- [[scala.swing `scala.swing`]] - A convenient wrapper around Java's GUI framework called Swing (scala-swing.jar)
- [[scala.util.continuations `scala.util.continuations`]] - Delimited continuations using continuation-passing-style
(scala-continuations-library.jar, scala-continuations-plugin.jar)
- [[scala.util.parsing `scala.util.parsing`]] - [[scala.util.parsing.combinator Parser combinators]], including an
example implementation of a [[scala.util.parsing.json JSON parser]] (scala-parser-combinators.jar)
- [[scala.actors `scala.actors`]] - Actor-based concurrency (deprecated and replaced by Akka actors,
scala-actors.jar)
== 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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