Scala Standard Library2.13.0 < Back

Packages

package root
This is the documentation for the Scala standard library.
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:
- scala.collection and its sub-packages contain Scala's collections framework
  - scala.collection.immutable - Immutable, sequential data-structures such as Vector, List, Range, HashMap or HashSet
  - scala.collection.mutable - Mutable, sequential data-structures such as ArrayBuffer, StringBuilder, HashMap or HashSet
  - scala.collection.concurrent - Mutable, concurrent data-structures such as TrieMap
- scala.concurrent - Primitives for concurrent programming such as Futures and Promises
- scala.io - Input and output operations
- scala.math - Basic math functions and additional numeric types like BigInt and BigDecimal
- scala.sys - Interaction with other processes and the operating system
- scala.util.matching - Regular expressions
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.
Definition Classes
root
package scala
Core Scala types.
Core Scala types. They are always available without an explicit import.
Definition Classes
root
package collection
Definition Classes
scala
package concurrent
Definition Classes
collection
package convert
Definition Classes
collection
AsJavaConverters
AsJavaExtensions
AsScalaConverters
AsScalaExtensions
ImplicitConversions
ImplicitConversionsToJava
ImplicitConversionsToScala
StreamExtensions
ToJavaImplicits
ToScalaImplicits
package generic
Definition Classes
collection
package immutable
Definition Classes
collection
package mutable
Definition Classes
collection

scala.collection

convert

package convert

Content Hierarchy

Ordering

Alphabetic

Visibility

Public
All

Type Members

trait AsJavaConverters extends AnyRef
Defines converter methods from Scala to Java collections.
Defines converter methods from Scala to Java collections. These methods are available through the scala.jdk.javaapi.CollectionConverters object.
trait AsJavaExtensions extends AnyRef
Defines asJava extension methods, available through scala.jdk.CollectionConverters.
trait AsScalaConverters extends AnyRef
Defines converter methods from Java to Scala collections.
Defines converter methods from Java to Scala collections. These methods are available through the scala.jdk.javaapi.CollectionConverters object.
trait AsScalaExtensions extends AnyRef
Defines asScala extension methods, available through scala.jdk.CollectionConverters.
trait StreamExtensions extends AnyRef
Defines extension methods to create Java Streams for Scala collections, available through scala.jdk.StreamConverters.Ops.
trait ToJavaImplicits extends AnyRef
Defines implicit conversions from Scala to Java collections.
trait ToScalaImplicits extends AnyRef
Defines implicit converter methods from Java to Scala collections.

Value Members

object StreamExtensions

Deprecated Value Members

object ImplicitConversions extends ToScalaImplicits with ToJavaImplicits
Convenience for miscellaneous implicit conversions between Java and Scala collections API.
Convenience for miscellaneous implicit conversions between Java and Scala collections API.
It is recommended to use explicit conversions provided by collection.JavaConverters instead. Implicit conversions may cause unexpected issues. Example:
```
import collection.convert.ImplicitConversions._
case class StringBox(s: String)
val m = Map(StringBox("one") -> "uno")
m.get("one")
```
The above example returns null instead of producing a type error at compile-time. The map is implicitly converted to a java.util.Map which provides a method get(x: AnyRef).
Annotations
@deprecated
Deprecated
(Since version 2.13.0) Use scala.jdk.CollectionConverters instead
object ImplicitConversionsToJava extends ToJavaImplicits
Convenience for miscellaneous implicit conversions from Scala to Java collections API.
Convenience for miscellaneous implicit conversions from Scala to Java collections API.
It is recommended to use explicit conversions provided by collection.JavaConverters instead. Implicit conversions may cause unexpected issues, see ImplicitConversions.
Annotations
@deprecated
Deprecated
(Since version 2.13.0) Use scala.jdk.CollectionConverters instead
object ImplicitConversionsToScala extends ToScalaImplicits
Convenience for miscellaneous implicit conversions from Java to Scala collections API.
Convenience for miscellaneous implicit conversions from Java to Scala collections API.
It is recommended to use explicit conversions provided by collection.JavaConverters instead. Implicit conversions may cause unexpected issues, see ImplicitConversions.
Annotations
@deprecated
Deprecated
(Since version 2.13.0) Use scala.jdk.CollectionConverters instead

Packages

Package structure

Automatic imports

convert

package convert

Type Members

Value Members

Deprecated Value Members

Ungrouped

convert