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:

    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 jdk
    Definition Classes
    scala
  • object Accumulator

    Contains factory methods to build Accumulators.

    Contains factory methods to build Accumulators.

    Note that the Accumulator object itself is not a factory, but it is implicitly convert to a factory according to the element type, see Accumulator.toFactory.

    This allows passing the Accumulator object as argument when a collection.Factory, and the implicit Accumulator.AccumulatorFactoryShape instance is used to build a specialized Accumulator according to the element type:

    scala> val intAcc = Accumulator(1,2,3)
    intAcc: scala.collection.convert.IntAccumulator = IntAccumulator(1, 2, 3)
    
    scala> val anyAccc = Accumulator("K")
    anyAccc: scala.collection.convert.AnyAccumulator[String] = AnyAccumulator(K)
    
    scala> val intAcc2 = List(1,2,3).to(Accumulator)
    intAcc2: scala.jdk.IntAccumulator = IntAccumulator(1, 2, 3)
    
    scala> val anyAcc2 = List("K").to(Accumulator)
    anyAcc2: scala.jdk.AnyAccumulator[String] = AnyAccumulator(K)
    Definition Classes
    jdk
  • AccumulatorFactoryShape
  • LowPriorityAccumulatorFactoryShape

sealed trait AccumulatorFactoryShape[A, C] extends AnyRef

An implicit AccumulatorFactoryShape is used in Accumulator factory method to return specialized variants according to the element type.

Source
Accumulator.scala
Linear Supertypes
Type Hierarchy
Ordering
  1. Alphabetic
  2. By Inheritance
Inherited
  1. AccumulatorFactoryShape
  2. AnyRef
  3. Any
Implicitly
  1. by any2stringadd
  2. by StringFormat
  3. by Ensuring
  4. by ArrowAssoc
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Visibility
  1. Public
  2. All

Abstract Value Members

  1. abstract def empty: C
  2. abstract def factory: Factory[A, C]