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  1. type ::[A] = scala.collection.immutable.::[A]
  2. type AbstractMethodError = java.lang.AbstractMethodError
  3. abstract class Any

    Class Any is the root of the Scala class hierarchy.

    Class Any is the root of the Scala class hierarchy. Every class in a Scala execution environment inherits directly or indirectly from this class.

    Starting with Scala 2.10 it is possible to directly extend Any using universal traits. A universal trait is a trait that extends Any, only has defs as members, and does no initialization.

    The main use case for universal traits is to allow basic inheritance of methods for value classes. For example,

    trait Printable extends Any {
      def print(): Unit = println(this)
    }
    class Wrapper(val underlying: Int) extends AnyVal with Printable
    
    val w = new Wrapper(3)
    w.print()

    See the Value Classes and Universal Traits for more details on the interplay of universal traits and value classes.

  4. abstract class AnyVal extends Any

    AnyVal is the root class of all value types, which describe values not implemented as objects in the underlying host system.

    AnyVal is the root class of all value types, which describe values not implemented as objects in the underlying host system. Value classes are specified in Scala Language Specification, section 12.2.

    The standard implementation includes nine AnyVal subtypes:

    scala.Double, scala.Float, scala.Long, scala.Int, scala.Char, scala.Short, and scala.Byte are the numeric value types.

    scala.Unit and scala.Boolean are the non-numeric value types.

    Other groupings:

    Prior to Scala 2.10, AnyVal was a sealed trait. Beginning with Scala 2.10, however, it is possible to define a subclass of AnyVal called a user-defined value class which is treated specially by the compiler. Properly-defined user value classes provide a way to improve performance on user-defined types by avoiding object allocation at runtime, and by replacing virtual method invocations with static method invocations.

    User-defined value classes which avoid object allocation...

    • must have a single val parameter that is the underlying runtime representation.
    • can define defs, but no vals, vars, or nested traitss, classes or objects.
    • typically extend no other trait apart from AnyVal.
    • cannot be used in type tests or pattern matching.
    • may not override equals or hashCode methods.

    A minimal example:

    class Wrapper(val underlying: Int) extends AnyVal {
      def foo: Wrapper = new Wrapper(underlying * 19)
    }

    It's important to note that user-defined value classes are limited, and in some circumstances, still must allocate a value class instance at runtime. These limitations and circumstances are explained in greater detail in the Value Classes and Universal Traits.

  5. trait App extends DelayedInit

    The App trait can be used to quickly turn objects into executable programs.

    The App trait can be used to quickly turn objects into executable programs. Here is an example:

    object Main extends App {
      Console.println("Hello World: " + (args mkString ", "))
    }

    Here, object Main inherits the main method of App.

    args returns the current command line arguments as an array.

    Caveats

    It should be noted that this trait is implemented using the DelayedInit functionality, which means that fields of the object will not have been initialized before the main method has been executed.

    It should also be noted that the main method should not be overridden: the whole class body becomes the “main method”.

    Future versions of this trait will no longer extend DelayedInit.

    Version

    2.1, 15/02/2011

  6. final class Array [T] extends java.io.Serializable with java.lang.Cloneable

    Arrays are mutable, indexed collections of values.

    Arrays are mutable, indexed collections of values. Array[T] is Scala's representation for Java's T[].

    val numbers = Array(1, 2, 3, 4)
    val first = numbers(0) // read the first element
    numbers(3) = 100 // replace the 4th array element with 100
    val biggerNumbers = numbers.map(_ * 2) // multiply all numbers by two

    Arrays make use of two common pieces of Scala syntactic sugar, shown on lines 2 and 3 of the above example code. Line 2 is translated into a call to apply(Int), while line 3 is translated into a call to update(Int, T).

    Two implicit conversions exist in scala.Predef that are frequently applied to arrays: a conversion to scala.collection.mutable.ArrayOps (shown on line 4 of the example above) and a conversion to scala.collection.mutable.WrappedArray (a subtype of scala.collection.Seq). Both types make available many of the standard operations found in the Scala collections API. The conversion to ArrayOps is temporary, as all operations defined on ArrayOps return an Array, while the conversion to WrappedArray is permanent as all operations return a WrappedArray.

    The conversion to ArrayOps takes priority over the conversion to WrappedArray. For instance, consider the following code:

    val arr = Array(1, 2, 3)
    val arrReversed = arr.reverse
    val seqReversed : Seq[Int] = arr.reverse

    Value arrReversed will be of type Array[Int], with an implicit conversion to ArrayOps occurring to perform the reverse operation. The value of seqReversed, on the other hand, will be computed by converting to WrappedArray first and invoking the variant of reverse that returns another WrappedArray.

    Version

    1.0

    See also

    "The Scala 2.8 Collections' API" section on Array by Martin Odersky for more information.

    "Scala 2.8 Arrays" the Scala Improvement Document detailing arrays since Scala 2.8.

    Scala Language Specification, for in-depth information on the transformations the Scala compiler makes on Arrays (Sections 6.6 and 6.15 respectively.)

  7. type ArrayIndexOutOfBoundsException = java.lang.ArrayIndexOutOfBoundsException
  8. type BigDecimal = scala.math.BigDecimal
  9. type BigInt = scala.math.BigInt
  10. abstract final class Boolean extends AnyVal

    Boolean (equivalent to Java's boolean primitive type) is a subtype of scala.AnyVal.

    Boolean (equivalent to Java's boolean primitive type) is a subtype of scala.AnyVal. Instances of Boolean are not represented by an object in the underlying runtime system.

    There is an implicit conversion from scala.Boolean => scala.runtime.RichBoolean which provides useful non-primitive operations.

  11. type BufferedIterator[+A] = scala.collection.BufferedIterator[A]
  12. abstract final class Byte extends AnyVal

    Byte, a 8-bit signed integer (equivalent to Java's byte primitive type) is a subtype of scala.AnyVal.

    Byte, a 8-bit signed integer (equivalent to Java's byte primitive type) is a subtype of scala.AnyVal. Instances of Byte are not represented by an object in the underlying runtime system.

    There is an implicit conversion from scala.Byte => scala.runtime.RichByte which provides useful non-primitive operations.

  13. abstract final class Char extends AnyVal

    Char, a 16-bit unsigned integer (equivalent to Java's char primitive type) is a subtype of scala.AnyVal.

    Char, a 16-bit unsigned integer (equivalent to Java's char primitive type) is a subtype of scala.AnyVal. Instances of Char are not represented by an object in the underlying runtime system.

    There is an implicit conversion from scala.Char => scala.runtime.RichChar which provides useful non-primitive operations.

  14. type ClassCastException = java.lang.ClassCastException
  15. trait Cloneable extends java.lang.Cloneable

    Classes extending this trait are cloneable across platforms (Java, .NET).

  16. abstract final class Double extends AnyVal

    Double, a 64-bit IEEE-754 floating point number (equivalent to Java's double primitive type) is a subtype of scala.AnyVal.

    Double, a 64-bit IEEE-754 floating point number (equivalent to Java's double primitive type) is a subtype of scala.AnyVal. Instances of Double are not represented by an object in the underlying runtime system.

    There is an implicit conversion from scala.Double => scala.runtime.RichDouble which provides useful non-primitive operations.

  17. trait Dynamic extends Any

    A marker trait that enables dynamic invocations.

    A marker trait that enables dynamic invocations. Instances x of this trait allow method invocations x.meth(args) for arbitrary method names meth and argument lists args as well as field accesses x.field for arbitrary field names field.

    If a call is not natively supported by x (i.e. if type checking fails), it is rewritten according to the following rules:

    foo.method("blah")      ~~> foo.applyDynamic("method")("blah")
    foo.method(x = "blah")  ~~> foo.applyDynamicNamed("method")(("x", "blah"))
    foo.method(x = 1, 2)    ~~> foo.applyDynamicNamed("method")(("x", 1), ("", 2))
    foo.field           ~~> foo.selectDynamic("field")
    foo.varia = 10      ~~> foo.updateDynamic("varia")(10)
    foo.arr(10) = 13    ~~> foo.selectDynamic("arr").update(10, 13)
    foo.arr(10)         ~~> foo.applyDynamic("arr")(10)

    As of Scala 2.10, defining direct or indirect subclasses of this trait is only possible if the language feature dynamics is enabled.

  18. type Either[+A, +B] = scala.util.Either[A, B]
  19. abstract class Enumeration extends Serializable

    Defines a finite set of values specific to the enumeration.

    Defines a finite set of values specific to the enumeration. Typically these values enumerate all possible forms something can take and provide a lightweight alternative to case classes.

    Each call to a Value method adds a new unique value to the enumeration. To be accessible, these values are usually defined as val members of the evaluation.

    All values in an enumeration share a common, unique type defined as the Value type member of the enumeration (Value selected on the stable identifier path of the enumeration instance).

    Annotations
    @SerialVersionUID()
    Examples:
    1. // Example of adding attributes to an enumeration by extending the Enumeration.Val class
      object Planet extends Enumeration {
        protected case class Val(mass: Double, radius: Double) extends super.Val {
          def surfaceGravity: Double = Planet.G * mass / (radius * radius)
          def surfaceWeight(otherMass: Double): Double = otherMass * surfaceGravity
        }
        implicit def valueToPlanetVal(x: Value): Val = x.asInstanceOf[Val]
      
        val G: Double = 6.67300E-11
        val Mercury = Val(3.303e+23, 2.4397e6)
        val Venus   = Val(4.869e+24, 6.0518e6)
        val Earth   = Val(5.976e+24, 6.37814e6)
        val Mars    = Val(6.421e+23, 3.3972e6)
        val Jupiter = Val(1.9e+27, 7.1492e7)
        val Saturn  = Val(5.688e+26, 6.0268e7)
        val Uranus  = Val(8.686e+25, 2.5559e7)
        val Neptune = Val(1.024e+26, 2.4746e7)
      }
      
      println(Planet.values.filter(_.radius > 7.0e6))
      // output:
      // Planet.ValueSet(Jupiter, Saturn, Uranus, Neptune)
    2. ,
    3. // Define a new enumeration with a type alias and work with the full set of enumerated values
      object WeekDay extends Enumeration {
        type WeekDay = Value
        val Mon, Tue, Wed, Thu, Fri, Sat, Sun = Value
      }
      import WeekDay._
      
      def isWorkingDay(d: WeekDay) = ! (d == Sat || d == Sun)
      
      WeekDay.values filter isWorkingDay foreach println
      // output:
      // Mon
      // Tue
      // Wed
      // Thu
      // Fri
  20. trait Equals extends Any

    An interface containing operations for equality.

    An interface containing operations for equality. The only method not already present in class AnyRef is canEqual.

  21. type Equiv[T] = scala.math.Equiv[T]
  22. type Error = java.lang.Error
  23. type Exception = java.lang.Exception
  24. class FallbackArrayBuilding extends AnyRef

    Contains a fallback builder for arrays when the element type does not have a class tag.

    Contains a fallback builder for arrays when the element type does not have a class tag. In that case a generic array is built.

  25. abstract final class Float extends AnyVal

    Float, a 32-bit IEEE-754 floating point number (equivalent to Java's float primitive type) is a subtype of scala.AnyVal.

    Float, a 32-bit IEEE-754 floating point number (equivalent to Java's float primitive type) is a subtype of scala.AnyVal. Instances of Float are not represented by an object in the underlying runtime system.

    There is an implicit conversion from scala.Float => scala.runtime.RichFloat which provides useful non-primitive operations.

  26. type Fractional[T] = scala.math.Fractional[T]
  27. trait Function0 [+R] extends AnyRef

    A function of 0 parameters.

    A function of 0 parameters.

    In the following example, the definition of javaVersion is a shorthand for the anonymous class definition anonfun0:

     object Main extends App {
       val javaVersion = () => sys.props("java.version")
    
       val anonfun0 = new Function0[String] {
         def apply(): String = sys.props("java.version")
       }
       assert(javaVersion() == anonfun0())
    }
  28. trait Function1 [-T1, +R] extends AnyRef

    A function of 1 parameter.

    A function of 1 parameter.

    In the following example, the definition of succ is a shorthand for the anonymous class definition anonfun1:

     object Main extends App {
       val succ = (x: Int) => x + 1
       val anonfun1 = new Function1[Int, Int] {
         def apply(x: Int): Int = x + 1
       }
       assert(succ(0) == anonfun1(0))
    }

    Note that the difference between Function1 and scala.PartialFunction is that the latter can specify inputs which it will not handle.

    Annotations
    @implicitNotFound( msg = ... )
  29. trait Function10 [-T1, -T2, -T3, -T4, -T5, -T6, -T7, -T8, -T9, -T10, +R] extends AnyRef

    A function of 10 parameters.

  30. trait Function11 [-T1, -T2, -T3, -T4, -T5, -T6, -T7, -T8, -T9, -T10, -T11, +R] extends AnyRef

    A function of 11 parameters.

  31. trait Function12 [-T1, -T2, -T3, -T4, -T5, -T6, -T7, -T8, -T9, -T10, -T11, -T12, +R] extends AnyRef

    A function of 12 parameters.

  32. trait Function13 [-T1, -T2, -T3, -T4, -T5, -T6, -T7, -T8, -T9, -T10, -T11, -T12, -T13, +R] extends AnyRef

    A function of 13 parameters.

  33. trait Function14 [-T1, -T2, -T3, -T4, -T5, -T6, -T7, -T8, -T9, -T10, -T11, -T12, -T13, -T14, +R] extends AnyRef

    A function of 14 parameters.

  34. trait Function15 [-T1, -T2, -T3, -T4, -T5, -T6, -T7, -T8, -T9, -T10, -T11, -T12, -T13, -T14, -T15, +R] extends AnyRef

    A function of 15 parameters.

  35. trait Function16 [-T1, -T2, -T3, -T4, -T5, -T6, -T7, -T8, -T9, -T10, -T11, -T12, -T13, -T14, -T15, -T16, +R] extends AnyRef

    A function of 16 parameters.

  36. trait Function17 [-T1, -T2, -T3, -T4, -T5, -T6, -T7, -T8, -T9, -T10, -T11, -T12, -T13, -T14, -T15, -T16, -T17, +R] extends AnyRef

    A function of 17 parameters.

  37. trait Function18 [-T1, -T2, -T3, -T4, -T5, -T6, -T7, -T8, -T9, -T10, -T11, -T12, -T13, -T14, -T15, -T16, -T17, -T18, +R] extends AnyRef

    A function of 18 parameters.

  38. trait Function19 [-T1, -T2, -T3, -T4, -T5, -T6, -T7, -T8, -T9, -T10, -T11, -T12, -T13, -T14, -T15, -T16, -T17, -T18, -T19, +R] extends AnyRef

    A function of 19 parameters.

  39. trait Function2 [-T1, -T2, +R] extends AnyRef

    A function of 2 parameters.

    A function of 2 parameters.

    In the following example, the definition of max is a shorthand for the anonymous class definition anonfun2:

     object Main extends App {
       val max = (x: Int, y: Int) => if (x < y) y else x
    
       val anonfun2 = new Function2[Int, Int, Int] {
         def apply(x: Int, y: Int): Int = if (x < y) y else x
       }
       assert(max(0, 1) == anonfun2(0, 1))
    }
  40. trait Function20 [-T1, -T2, -T3, -T4, -T5, -T6, -T7, -T8, -T9, -T10, -T11, -T12, -T13, -T14, -T15, -T16, -T17, -T18, -T19, -T20, +R] extends AnyRef

    A function of 20 parameters.

  41. trait Function21 [-T1, -T2, -T3, -T4, -T5, -T6, -T7, -T8, -T9, -T10, -T11, -T12, -T13, -T14, -T15, -T16, -T17, -T18, -T19, -T20, -T21, +R] extends AnyRef

    A function of 21 parameters.

  42. trait Function22 [-T1, -T2, -T3, -T4, -T5, -T6, -T7, -T8, -T9, -T10, -T11, -T12, -T13, -T14, -T15, -T16, -T17, -T18, -T19, -T20, -T21, -T22, +R] extends AnyRef

    A function of 22 parameters.

  43. trait Function3 [-T1, -T2, -T3, +R] extends AnyRef

    A function of 3 parameters.

  44. trait Function4 [-T1, -T2, -T3, -T4, +R] extends AnyRef

    A function of 4 parameters.

  45. trait Function5 [-T1, -T2, -T3, -T4, -T5, +R] extends AnyRef

    A function of 5 parameters.

  46. trait Function6 [-T1, -T2, -T3, -T4, -T5, -T6, +R] extends AnyRef

    A function of 6 parameters.

  47. trait Function7 [-T1, -T2, -T3, -T4, -T5, -T6, -T7, +R] extends AnyRef

    A function of 7 parameters.

  48. trait Function8 [-T1, -T2, -T3, -T4, -T5, -T6, -T7, -T8, +R] extends AnyRef

    A function of 8 parameters.

  49. trait Function9 [-T1, -T2, -T3, -T4, -T5, -T6, -T7, -T8, -T9, +R] extends AnyRef

    A function of 9 parameters.

  50. type IllegalArgumentException = java.lang.IllegalArgumentException
  51. trait Immutable extends AnyRef

    A marker trait for all immutable data structures such as immutable collections.

    A marker trait for all immutable data structures such as immutable collections.

    Since

    2.8

  52. type IndexOutOfBoundsException = java.lang.IndexOutOfBoundsException
  53. type IndexedSeq[+A] = scala.collection.IndexedSeq[A]
  54. abstract final class Int extends AnyVal

    Int, a 32-bit signed integer (equivalent to Java's int primitive type) is a subtype of scala.AnyVal.

    Int, a 32-bit signed integer (equivalent to Java's int primitive type) is a subtype of scala.AnyVal. Instances of Int are not represented by an object in the underlying runtime system.

    There is an implicit conversion from scala.Int => scala.runtime.RichInt which provides useful non-primitive operations.

  55. type Integral[T] = scala.math.Integral[T]
  56. type InterruptedException = java.lang.InterruptedException
  57. type Iterable[+A] = scala.collection.Iterable[A]
  58. type Iterator[+A] = scala.collection.Iterator[A]
  59. type Left[+A, +B] = scala.util.Left[A, B]
  60. type List[+A] = scala.collection.immutable.List[A]
  61. abstract final class Long extends AnyVal

    Long, a 64-bit signed integer (equivalent to Java's long primitive type) is a subtype of scala.AnyVal.

    Long, a 64-bit signed integer (equivalent to Java's long primitive type) is a subtype of scala.AnyVal. Instances of Long are not represented by an object in the underlying runtime system.

    There is an implicit conversion from scala.Long => scala.runtime.RichLong which provides useful non-primitive operations.

  62. final class MatchError extends RuntimeException

    This class implements errors which are thrown whenever an object doesn't match any pattern of a pattern matching expression.

    This class implements errors which are thrown whenever an object doesn't match any pattern of a pattern matching expression.

    Version

    1.1, 05/03/2004

    Since

    2.0

  63. trait Mutable extends AnyRef

    A marker trait for mutable data structures such as mutable collections

    A marker trait for mutable data structures such as mutable collections

    Since

    2.8

  64. type NoSuchElementException = java.util.NoSuchElementException
  65. final class NotImplementedError extends Error

    Throwing this exception can be a temporary replacement for a method body that remains to be implemented.

    Throwing this exception can be a temporary replacement for a method body that remains to be implemented. For instance, the exception is thrown by Predef.???.

  66. abstract final class Nothing extends Any

    Nothing is - together with scala.Null - at the bottom of Scala's type hierarchy.

    Nothing is - together with scala.Null - at the bottom of Scala's type hierarchy.

    Nothing is a subtype of every other type (including scala.Null); there exist no instances of this type. Although type Nothing is uninhabited, it is nevertheless useful in several ways. For instance, the Scala library defines a value scala.collection.immutable.Nil of type List[Nothing]. Because lists are covariant in Scala, this makes scala.collection.immutable.Nil an instance of List[T], for any element of type T.

    Another usage for Nothing is the return type for methods which never return normally. One example is method error in scala.sys, which always throws an exception.

  67. abstract final class Null extends AnyRef

    Null is - together with scala.Nothing - at the bottom of the Scala type hierarchy.

    Null is - together with scala.Nothing - at the bottom of the Scala type hierarchy.

    Null is a subtype of all reference types; its only instance is the null reference. Since Null is not a subtype of value types, null is not a member of any such type. For instance, it is not possible to assign null to a variable of type scala.Int.

  68. type NullPointerException = java.lang.NullPointerException
  69. type NumberFormatException = java.lang.NumberFormatException
  70. type Numeric[T] = scala.math.Numeric[T]
  71. sealed abstract class Option [+A] extends Product with Serializable

    Represents optional values.

    Represents optional values. Instances of Option are either an instance of scala.Some or the object None.

    The most idiomatic way to use an scala.Option instance is to treat it as a collection or monad and use map,flatMap, filter, or foreach:

    val name: Option[String] = request getParameter "name"
    val upper = name map { _.trim } filter { _.length != 0 } map { _.toUpperCase }
    println(upper getOrElse "")

    Note that this is equivalent to

    val upper = for {
      name <- request getParameter "name"
      trimmed <- Some(name.trim)
      upper <- Some(trimmed.toUpperCase) if trimmed.length != 0
    } yield upper
    println(upper getOrElse "")

    Because of how for comprehension works, if None is returned from request.getParameter, the entire expression results in None

    This allows for sophisticated chaining of scala.Option values without having to check for the existence of a value.

    A less-idiomatic way to use scala.Option values is via pattern matching:

    val nameMaybe = request getParameter "name"
    nameMaybe match {
      case Some(name) =>
        println(name.trim.toUppercase)
      case None =>
        println("No name value")
    }
    Annotations
    @SerialVersionUID()
    Version

    1.1, 16/01/2007

    Note

    Many of the methods in here are duplicative with those in the Traversable hierarchy, but they are duplicated for a reason: the implicit conversion tends to leave one with an Iterable in situations where one could have retained an Option.

  72. type Ordered[T] = scala.math.Ordered[T]
  73. type Ordering[T] = scala.math.Ordering[T]
  74. trait PartialFunction [-A, +B] extends (A) ⇒ B

    A partial function of type PartialFunction[A, B] is a unary function where the domain does not necessarily include all values of type A.

    A partial function of type PartialFunction[A, B] is a unary function where the domain does not necessarily include all values of type A. The function isDefinedAt allows to test dynamically if a value is in the domain of the function.

    Even if isDefinedAt returns true for an a: A, calling apply(a) may still throw an exception, so the following code is legal:

    val f: PartialFunction[Int, Any] = { case _ => 1/0 }

    It is the responsibility of the caller to call isDefinedAt before calling apply, because if isDefinedAt is false, it is not guaranteed apply will throw an exception to indicate an error condition. If an exception is not thrown, evaluation may result in an arbitrary value.

    The main distinction between PartialFunction and scala.Function1 is that the user of a PartialFunction may choose to do something different with input that is declared to be outside its domain. For example:

    val sample = 1 to 10
    val isEven: PartialFunction[Int, String] = {
      case x if x % 2 == 0 => x+" is even"
    }
    
    // the method collect can use isDefinedAt to select which members to collect
    val evenNumbers = sample collect isEven
    
    val isOdd: PartialFunction[Int, String] = {
      case x if x % 2 == 1 => x+" is odd"
    }
    
    // the method orElse allows chaining another partial function to handle
    // input outside the declared domain
    val numbers = sample map (isEven orElse isOdd)
    Version

    1.0, 16/07/2003

  75. type PartialOrdering[T] = scala.math.PartialOrdering[T]
  76. type PartiallyOrdered[T] = scala.math.PartiallyOrdered[T]
  77. trait Product extends Equals

    Base trait for all products, which in the standard library include at least scala.Product1 through scala.Product22 and therefore also their subclasses scala.Tuple1 through scala.Tuple22.

    Base trait for all products, which in the standard library include at least scala.Product1 through scala.Product22 and therefore also their subclasses scala.Tuple1 through scala.Tuple22. In addition, all case classes implement Product with synthetically generated methods.

    Version

    1.0

    Since

    2.3

  78. trait Product1 [+T1] extends Product

    Product1 is a Cartesian product of 1 component.

    Product1 is a Cartesian product of 1 component.

    Since

    2.3

  79. trait Product10 [+T1, +T2, +T3, +T4, +T5, +T6, +T7, +T8, +T9, +T10] extends Product

    Product10 is a Cartesian product of 10 components.

    Product10 is a Cartesian product of 10 components.

    Since

    2.3

  80. trait Product11 [+T1, +T2, +T3, +T4, +T5, +T6, +T7, +T8, +T9, +T10, +T11] extends Product

    Product11 is a Cartesian product of 11 components.

    Product11 is a Cartesian product of 11 components.

    Since

    2.3

  81. trait Product12 [+T1, +T2, +T3, +T4, +T5, +T6, +T7, +T8, +T9, +T10, +T11, +T12] extends Product

    Product12 is a Cartesian product of 12 components.

    Product12 is a Cartesian product of 12 components.

    Since

    2.3

  82. trait Product13 [+T1, +T2, +T3, +T4, +T5, +T6, +T7, +T8, +T9, +T10, +T11, +T12, +T13] extends Product

    Product13 is a Cartesian product of 13 components.

    Product13 is a Cartesian product of 13 components.

    Since

    2.3

  83. trait Product14 [+T1, +T2, +T3, +T4, +T5, +T6, +T7, +T8, +T9, +T10, +T11, +T12, +T13, +T14] extends Product

    Product14 is a Cartesian product of 14 components.

    Product14 is a Cartesian product of 14 components.

    Since

    2.3

  84. trait Product15 [+T1, +T2, +T3, +T4, +T5, +T6, +T7, +T8, +T9, +T10, +T11, +T12, +T13, +T14, +T15] extends Product

    Product15 is a Cartesian product of 15 components.

    Product15 is a Cartesian product of 15 components.

    Since

    2.3

  85. trait Product16 [+T1, +T2, +T3, +T4, +T5, +T6, +T7, +T8, +T9, +T10, +T11, +T12, +T13, +T14, +T15, +T16] extends Product

    Product16 is a Cartesian product of 16 components.

    Product16 is a Cartesian product of 16 components.

    Since

    2.3

  86. trait Product17 [+T1, +T2, +T3, +T4, +T5, +T6, +T7, +T8, +T9, +T10, +T11, +T12, +T13, +T14, +T15, +T16, +T17] extends Product

    Product17 is a Cartesian product of 17 components.

    Product17 is a Cartesian product of 17 components.

    Since

    2.3

  87. trait Product18 [+T1, +T2, +T3, +T4, +T5, +T6, +T7, +T8, +T9, +T10, +T11, +T12, +T13, +T14, +T15, +T16, +T17, +T18] extends Product

    Product18 is a Cartesian product of 18 components.

    Product18 is a Cartesian product of 18 components.

    Since

    2.3

  88. trait Product19 [+T1, +T2, +T3, +T4, +T5, +T6, +T7, +T8, +T9, +T10, +T11, +T12, +T13, +T14, +T15, +T16, +T17, +T18, +T19] extends Product

    Product19 is a Cartesian product of 19 components.

    Product19 is a Cartesian product of 19 components.

    Since

    2.3

  89. trait Product2 [+T1, +T2] extends Product

    Product2 is a Cartesian product of 2 components.

    Product2 is a Cartesian product of 2 components.

    Since

    2.3

  90. trait Product20 [+T1, +T2, +T3, +T4, +T5, +T6, +T7, +T8, +T9, +T10, +T11, +T12, +T13, +T14, +T15, +T16, +T17, +T18, +T19, +T20] extends Product

    Product20 is a Cartesian product of 20 components.

    Product20 is a Cartesian product of 20 components.

    Since

    2.3

  91. trait Product21 [+T1, +T2, +T3, +T4, +T5, +T6, +T7, +T8, +T9, +T10, +T11, +T12, +T13, +T14, +T15, +T16, +T17, +T18, +T19, +T20, +T21] extends Product

    Product21 is a Cartesian product of 21 components.

    Product21 is a Cartesian product of 21 components.

    Since

    2.3

  92. trait Product22 [+T1, +T2, +T3, +T4, +T5, +T6, +T7, +T8, +T9, +T10, +T11, +T12, +T13, +T14, +T15, +T16, +T17, +T18, +T19, +T20, +T21, +T22] extends Product

    Product22 is a Cartesian product of 22 components.

    Product22 is a Cartesian product of 22 components.

    Since

    2.3

  93. trait Product3 [+T1, +T2, +T3] extends Product

    Product3 is a Cartesian product of 3 components.

    Product3 is a Cartesian product of 3 components.

    Since

    2.3

  94. trait Product4 [+T1, +T2, +T3, +T4] extends Product

    Product4 is a Cartesian product of 4 components.

    Product4 is a Cartesian product of 4 components.

    Since

    2.3

  95. trait Product5 [+T1, +T2, +T3, +T4, +T5] extends Product

    Product5 is a Cartesian product of 5 components.

    Product5 is a Cartesian product of 5 components.

    Since

    2.3

  96. trait Product6 [+T1, +T2, +T3, +T4, +T5, +T6] extends Product

    Product6 is a Cartesian product of 6 components.

    Product6 is a Cartesian product of 6 components.

    Since

    2.3

  97. trait Product7 [+T1, +T2, +T3, +T4, +T5, +T6, +T7] extends Product

    Product7 is a Cartesian product of 7 components.

    Product7 is a Cartesian product of 7 components.

    Since

    2.3

  98. trait Product8 [+T1, +T2, +T3, +T4, +T5, +T6, +T7, +T8] extends Product

    Product8 is a Cartesian product of 8 components.

    Product8 is a Cartesian product of 8 components.

    Since

    2.3

  99. trait Product9 [+T1, +T2, +T3, +T4, +T5, +T6, +T7, +T8, +T9] extends Product

    Product9 is a Cartesian product of 9 components.

    Product9 is a Cartesian product of 9 components.

    Since

    2.3

  100. trait Proxy extends Any

    This class implements a simple proxy that forwards all calls to the public, non-final methods defined in class Any to another object self.

    This class implements a simple proxy that forwards all calls to the public, non-final methods defined in class Any to another object self. Those methods are:

    def hashCode(): Int
    def equals(other: Any): Boolean
    def toString(): String

    Note: forwarding methods in this way will most likely create an asymmetric equals method, which is not generally recommended.

    Version

    1.0, 26/04/2004

  101. type Range = scala.collection.immutable.Range
  102. type Right[+A, +B] = scala.util.Right[A, B]
  103. type RuntimeException = java.lang.RuntimeException
  104. case class ScalaReflectionException (msg: String) extends Exception with Product with Serializable

    An exception that indicates an error during Scala reflection

  105. type Seq[+A] = scala.collection.Seq[A]
  106. class SerialVersionUID extends Annotation with ClassfileAnnotation

    Annotation for specifying the static SerialVersionUID field of a serializable class.

  107. trait Serializable extends java.io.Serializable

    Classes extending this trait are serializable across platforms (Java, .NET).

  108. abstract final class Short extends AnyVal

    Short, a 16-bit signed integer (equivalent to Java's short primitive type) is a subtype of scala.AnyVal.

    Short, a 16-bit signed integer (equivalent to Java's short primitive type) is a subtype of scala.AnyVal. Instances of Short are not represented by an object in the underlying runtime system.

    There is an implicit conversion from scala.Short => scala.runtime.RichShort which provides useful non-primitive operations.

  109. final case class Some [+A](value: A) extends Option[A] with Product with Serializable

    Class Some[A] represents existing values of type A.

    Class Some[A] represents existing values of type A.

    Annotations
    @SerialVersionUID()
    Version

    1.0, 16/07/2003

  110. trait Specializable extends AnyRef

    A common supertype for companions of specializable types.

    A common supertype for companions of specializable types. Should not be extended in user code.

  111. type Stream[+A] = scala.collection.immutable.Stream[A]
  112. type StringBuilder = scala.collection.mutable.StringBuilder
  113. case class StringContext (parts: String*) extends Product with Serializable

    This class provides the basic mechanism to do String Interpolation.

    This class provides the basic mechanism to do String Interpolation. String Interpolation allows users to embed variable references directly in *processed* string literals. Here's an example:

    val name = "James"
    println(s"Hello, $name")  // Hello, James

    Any processed string literal is rewritten as an instantiation and method call against this class. For example:

    s"Hello, $name"

    is rewritten to be:

    StringContext("Hello, ", "").s(name)

    By default, this class provides the raw, s and f methods as available interpolators.

    To provide your own string interpolator, create an implicit class which adds a method to StringContext. Here's an example:

    implicit class JsonHelper(private val sc: StringContext) extends AnyVal {
      def json(args: Any*): JSONObject = ...
    }
    val x: JSONObject = json"{ a: $a }"

    Here the JsonHelper extension class implicitly adds the json method to StringContext which can be used for json string literals.

    parts

    The parts that make up the interpolated string, without the expressions that get inserted by interpolation.

    Since

    2.10.0

  114. type StringIndexOutOfBoundsException = java.lang.StringIndexOutOfBoundsException
  115. final class Symbol extends Serializable

    This class provides a simple way to get unique objects for equal strings.

    This class provides a simple way to get unique objects for equal strings. Since symbols are interned, they can be compared using reference equality. Instances of Symbol can be created easily with Scala's built-in quote mechanism.

    For instance, the Scala term 'mysym will invoke the constructor of the Symbol class in the following way: Symbol("mysym").

    Version

    1.8

  116. type Throwable = java.lang.Throwable
  117. type Traversable[+A] = scala.collection.Traversable[A]
  118. type TraversableOnce[+A] = scala.collection.TraversableOnce[A]
  119. final case class Tuple1 [+T1](_1: T1) extends Product1[T1] with Product with Serializable

    A tuple of 1 elements; the canonical representation of a scala.Product1.

    A tuple of 1 elements; the canonical representation of a scala.Product1.

    _1

    Element 1 of this Tuple1

  120. final case class Tuple10 [+T1, +T2, +T3, +T4, +T5, +T6, +T7, +T8, +T9, +T10](_1: T1, _2: T2, _3: T3, _4: T4, _5: T5, _6: T6, _7: T7, _8: T8, _9: T9, _10: T10) extends Product10[T1, T2, T3, T4, T5, T6, T7, T8, T9, T10] with Product with Serializable

    A tuple of 10 elements; the canonical representation of a scala.Product10.

    A tuple of 10 elements; the canonical representation of a scala.Product10.

    _1

    Element 1 of this Tuple10

    _2

    Element 2 of this Tuple10

    _3

    Element 3 of this Tuple10

    _4

    Element 4 of this Tuple10

    _5

    Element 5 of this Tuple10

    _6

    Element 6 of this Tuple10

    _7

    Element 7 of this Tuple10

    _8

    Element 8 of this Tuple10

    _9

    Element 9 of this Tuple10

    _10

    Element 10 of this Tuple10

  121. final case class Tuple11 [+T1, +T2, +T3, +T4, +T5, +T6, +T7, +T8, +T9, +T10, +T11](_1: T1, _2: T2, _3: T3, _4: T4, _5: T5, _6: T6, _7: T7, _8: T8, _9: T9, _10: T10, _11: T11) extends Product11[T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11] with Product with Serializable

    A tuple of 11 elements; the canonical representation of a scala.Product11.

    A tuple of 11 elements; the canonical representation of a scala.Product11.

    _1

    Element 1 of this Tuple11

    _2

    Element 2 of this Tuple11

    _3

    Element 3 of this Tuple11

    _4

    Element 4 of this Tuple11

    _5

    Element 5 of this Tuple11

    _6

    Element 6 of this Tuple11

    _7

    Element 7 of this Tuple11

    _8

    Element 8 of this Tuple11

    _9

    Element 9 of this Tuple11

    _10

    Element 10 of this Tuple11

    _11

    Element 11 of this Tuple11

  122. final case class Tuple12 [+T1, +T2, +T3, +T4, +T5, +T6, +T7, +T8, +T9, +T10, +T11, +T12](_1: T1, _2: T2, _3: T3, _4: T4, _5: T5, _6: T6, _7: T7, _8: T8, _9: T9, _10: T10, _11: T11, _12: T12) extends Product12[T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12] with Product with Serializable

    A tuple of 12 elements; the canonical representation of a scala.Product12.

    A tuple of 12 elements; the canonical representation of a scala.Product12.

    _1

    Element 1 of this Tuple12

    _2

    Element 2 of this Tuple12

    _3

    Element 3 of this Tuple12

    _4

    Element 4 of this Tuple12

    _5

    Element 5 of this Tuple12

    _6

    Element 6 of this Tuple12

    _7

    Element 7 of this Tuple12

    _8

    Element 8 of this Tuple12

    _9

    Element 9 of this Tuple12

    _10

    Element 10 of this Tuple12

    _11

    Element 11 of this Tuple12

    _12

    Element 12 of this Tuple12

  123. final case class Tuple13 [+T1, +T2, +T3, +T4, +T5, +T6, +T7, +T8, +T9, +T10, +T11, +T12, +T13](_1: T1, _2: T2, _3: T3, _4: T4, _5: T5, _6: T6, _7: T7, _8: T8, _9: T9, _10: T10, _11: T11, _12: T12, _13: T13) extends Product13[T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13] with Product with Serializable

    A tuple of 13 elements; the canonical representation of a scala.Product13.

    A tuple of 13 elements; the canonical representation of a scala.Product13.

    _1

    Element 1 of this Tuple13

    _2

    Element 2 of this Tuple13

    _3

    Element 3 of this Tuple13

    _4

    Element 4 of this Tuple13

    _5

    Element 5 of this Tuple13

    _6

    Element 6 of this Tuple13

    _7

    Element 7 of this Tuple13

    _8

    Element 8 of this Tuple13

    _9

    Element 9 of this Tuple13

    _10

    Element 10 of this Tuple13

    _11

    Element 11 of this Tuple13

    _12

    Element 12 of this Tuple13

    _13

    Element 13 of this Tuple13

  124. final case class Tuple14 [+T1, +T2, +T3, +T4, +T5, +T6, +T7, +T8, +T9, +T10, +T11, +T12, +T13, +T14](_1: T1, _2: T2, _3: T3, _4: T4, _5: T5, _6: T6, _7: T7, _8: T8, _9: T9, _10: T10, _11: T11, _12: T12, _13: T13, _14: T14) extends Product14[T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14] with Product with Serializable

    A tuple of 14 elements; the canonical representation of a scala.Product14.

    A tuple of 14 elements; the canonical representation of a scala.Product14.

    _1

    Element 1 of this Tuple14

    _2

    Element 2 of this Tuple14

    _3

    Element 3 of this Tuple14

    _4

    Element 4 of this Tuple14

    _5

    Element 5 of this Tuple14

    _6

    Element 6 of this Tuple14

    _7

    Element 7 of this Tuple14

    _8

    Element 8 of this Tuple14

    _9

    Element 9 of this Tuple14

    _10

    Element 10 of this Tuple14

    _11

    Element 11 of this Tuple14

    _12

    Element 12 of this Tuple14

    _13

    Element 13 of this Tuple14

    _14

    Element 14 of this Tuple14

  125. final case class Tuple15 [+T1, +T2, +T3, +T4, +T5, +T6, +T7, +T8, +T9, +T10, +T11, +T12, +T13, +T14, +T15](_1: T1, _2: T2, _3: T3, _4: T4, _5: T5, _6: T6, _7: T7, _8: T8, _9: T9, _10: T10, _11: T11, _12: T12, _13: T13, _14: T14, _15: T15) extends Product15[T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15] with Product with Serializable

    A tuple of 15 elements; the canonical representation of a scala.Product15.

    A tuple of 15 elements; the canonical representation of a scala.Product15.

    _1

    Element 1 of this Tuple15

    _2

    Element 2 of this Tuple15

    _3

    Element 3 of this Tuple15

    _4

    Element 4 of this Tuple15

    _5

    Element 5 of this Tuple15

    _6

    Element 6 of this Tuple15

    _7

    Element 7 of this Tuple15

    _8

    Element 8 of this Tuple15

    _9

    Element 9 of this Tuple15

    _10

    Element 10 of this Tuple15

    _11

    Element 11 of this Tuple15

    _12

    Element 12 of this Tuple15

    _13

    Element 13 of this Tuple15

    _14

    Element 14 of this Tuple15

    _15

    Element 15 of this Tuple15

  126. final case class Tuple16 [+T1, +T2, +T3, +T4, +T5, +T6, +T7, +T8, +T9, +T10, +T11, +T12, +T13, +T14, +T15, +T16](_1: T1, _2: T2, _3: T3, _4: T4, _5: T5, _6: T6, _7: T7, _8: T8, _9: T9, _10: T10, _11: T11, _12: T12, _13: T13, _14: T14, _15: T15, _16: T16) extends Product16[T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16] with Product with Serializable

    A tuple of 16 elements; the canonical representation of a scala.Product16.

    A tuple of 16 elements; the canonical representation of a scala.Product16.

    _1

    Element 1 of this Tuple16

    _2

    Element 2 of this Tuple16

    _3

    Element 3 of this Tuple16

    _4

    Element 4 of this Tuple16

    _5

    Element 5 of this Tuple16

    _6

    Element 6 of this Tuple16

    _7

    Element 7 of this Tuple16

    _8

    Element 8 of this Tuple16

    _9

    Element 9 of this Tuple16

    _10

    Element 10 of this Tuple16

    _11

    Element 11 of this Tuple16

    _12

    Element 12 of this Tuple16

    _13

    Element 13 of this Tuple16

    _14

    Element 14 of this Tuple16

    _15

    Element 15 of this Tuple16

    _16

    Element 16 of this Tuple16

  127. final case class Tuple17 [+T1, +T2, +T3, +T4, +T5, +T6, +T7, +T8, +T9, +T10, +T11, +T12, +T13, +T14, +T15, +T16, +T17](_1: T1, _2: T2, _3: T3, _4: T4, _5: T5, _6: T6, _7: T7, _8: T8, _9: T9, _10: T10, _11: T11, _12: T12, _13: T13, _14: T14, _15: T15, _16: T16, _17: T17) extends Product17[T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17] with Product with Serializable

    A tuple of 17 elements; the canonical representation of a scala.Product17.

    A tuple of 17 elements; the canonical representation of a scala.Product17.

    _1

    Element 1 of this Tuple17

    _2

    Element 2 of this Tuple17

    _3

    Element 3 of this Tuple17

    _4

    Element 4 of this Tuple17

    _5

    Element 5 of this Tuple17

    _6

    Element 6 of this Tuple17

    _7

    Element 7 of this Tuple17

    _8

    Element 8 of this Tuple17

    _9

    Element 9 of this Tuple17

    _10

    Element 10 of this Tuple17

    _11

    Element 11 of this Tuple17

    _12

    Element 12 of this Tuple17

    _13

    Element 13 of this Tuple17

    _14

    Element 14 of this Tuple17

    _15

    Element 15 of this Tuple17

    _16

    Element 16 of this Tuple17

    _17

    Element 17 of this Tuple17

  128. final case class Tuple18 [+T1, +T2, +T3, +T4, +T5, +T6, +T7, +T8, +T9, +T10, +T11, +T12, +T13, +T14, +T15, +T16, +T17, +T18](_1: T1, _2: T2, _3: T3, _4: T4, _5: T5, _6: T6, _7: T7, _8: T8, _9: T9, _10: T10, _11: T11, _12: T12, _13: T13, _14: T14, _15: T15, _16: T16, _17: T17, _18: T18) extends Product18[T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17, T18] with Product with Serializable

    A tuple of 18 elements; the canonical representation of a scala.Product18.

    A tuple of 18 elements; the canonical representation of a scala.Product18.

    _1

    Element 1 of this Tuple18

    _2

    Element 2 of this Tuple18

    _3

    Element 3 of this Tuple18

    _4

    Element 4 of this Tuple18

    _5

    Element 5 of this Tuple18

    _6

    Element 6 of this Tuple18

    _7

    Element 7 of this Tuple18

    _8

    Element 8 of this Tuple18

    _9

    Element 9 of this Tuple18

    _10

    Element 10 of this Tuple18

    _11

    Element 11 of this Tuple18

    _12

    Element 12 of this Tuple18

    _13

    Element 13 of this Tuple18

    _14

    Element 14 of this Tuple18

    _15

    Element 15 of this Tuple18

    _16

    Element 16 of this Tuple18

    _17

    Element 17 of this Tuple18

    _18

    Element 18 of this Tuple18

  129. final case class Tuple19 [+T1, +T2, +T3, +T4, +T5, +T6, +T7, +T8, +T9, +T10, +T11, +T12, +T13, +T14, +T15, +T16, +T17, +T18, +T19](_1: T1, _2: T2, _3: T3, _4: T4, _5: T5, _6: T6, _7: T7, _8: T8, _9: T9, _10: T10, _11: T11, _12: T12, _13: T13, _14: T14, _15: T15, _16: T16, _17: T17, _18: T18, _19: T19) extends Product19[T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17, T18, T19] with Product with Serializable

    A tuple of 19 elements; the canonical representation of a scala.Product19.

    A tuple of 19 elements; the canonical representation of a scala.Product19.

    _1

    Element 1 of this Tuple19

    _2

    Element 2 of this Tuple19

    _3

    Element 3 of this Tuple19

    _4

    Element 4 of this Tuple19

    _5

    Element 5 of this Tuple19

    _6

    Element 6 of this Tuple19

    _7

    Element 7 of this Tuple19

    _8

    Element 8 of this Tuple19

    _9

    Element 9 of this Tuple19

    _10

    Element 10 of this Tuple19

    _11

    Element 11 of this Tuple19

    _12

    Element 12 of this Tuple19

    _13

    Element 13 of this Tuple19

    _14

    Element 14 of this Tuple19

    _15

    Element 15 of this Tuple19

    _16

    Element 16 of this Tuple19

    _17

    Element 17 of this Tuple19

    _18

    Element 18 of this Tuple19

    _19

    Element 19 of this Tuple19

  130. final case class Tuple2 [+T1, +T2](_1: T1, _2: T2) extends Product2[T1, T2] with Product with Serializable

    A tuple of 2 elements; the canonical representation of a scala.Product2.

    A tuple of 2 elements; the canonical representation of a scala.Product2.

    _1

    Element 1 of this Tuple2

    _2

    Element 2 of this Tuple2

  131. final case class Tuple20 [+T1, +T2, +T3, +T4, +T5, +T6, +T7, +T8, +T9, +T10, +T11, +T12, +T13, +T14, +T15, +T16, +T17, +T18, +T19, +T20](_1: T1, _2: T2, _3: T3, _4: T4, _5: T5, _6: T6, _7: T7, _8: T8, _9: T9, _10: T10, _11: T11, _12: T12, _13: T13, _14: T14, _15: T15, _16: T16, _17: T17, _18: T18, _19: T19, _20: T20) extends Product20[T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17, T18, T19, T20] with Product with Serializable

    A tuple of 20 elements; the canonical representation of a scala.Product20.

    A tuple of 20 elements; the canonical representation of a scala.Product20.

    _1

    Element 1 of this Tuple20

    _2

    Element 2 of this Tuple20

    _3

    Element 3 of this Tuple20

    _4

    Element 4 of this Tuple20

    _5

    Element 5 of this Tuple20

    _6

    Element 6 of this Tuple20

    _7

    Element 7 of this Tuple20

    _8

    Element 8 of this Tuple20

    _9

    Element 9 of this Tuple20

    _10

    Element 10 of this Tuple20

    _11

    Element 11 of this Tuple20

    _12

    Element 12 of this Tuple20

    _13

    Element 13 of this Tuple20

    _14

    Element 14 of this Tuple20

    _15

    Element 15 of this Tuple20

    _16

    Element 16 of this Tuple20

    _17

    Element 17 of this Tuple20

    _18

    Element 18 of this Tuple20

    _19

    Element 19 of this Tuple20

    _20

    Element 20 of this Tuple20

  132. final case class Tuple21 [+T1, +T2, +T3, +T4, +T5, +T6, +T7, +T8, +T9, +T10, +T11, +T12, +T13, +T14, +T15, +T16, +T17, +T18, +T19, +T20, +T21](_1: T1, _2: T2, _3: T3, _4: T4, _5: T5, _6: T6, _7: T7, _8: T8, _9: T9, _10: T10, _11: T11, _12: T12, _13: T13, _14: T14, _15: T15, _16: T16, _17: T17, _18: T18, _19: T19, _20: T20, _21: T21) extends Product21[T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, T21] with Product with Serializable

    A tuple of 21 elements; the canonical representation of a scala.Product21.

    A tuple of 21 elements; the canonical representation of a scala.Product21.

    _1

    Element 1 of this Tuple21

    _2

    Element 2 of this Tuple21

    _3

    Element 3 of this Tuple21

    _4

    Element 4 of this Tuple21

    _5

    Element 5 of this Tuple21

    _6

    Element 6 of this Tuple21

    _7

    Element 7 of this Tuple21

    _8

    Element 8 of this Tuple21

    _9

    Element 9 of this Tuple21

    _10

    Element 10 of this Tuple21

    _11

    Element 11 of this Tuple21

    _12

    Element 12 of this Tuple21

    _13

    Element 13 of this Tuple21

    _14

    Element 14 of this Tuple21

    _15

    Element 15 of this Tuple21

    _16

    Element 16 of this Tuple21

    _17

    Element 17 of this Tuple21

    _18

    Element 18 of this Tuple21

    _19

    Element 19 of this Tuple21

    _20

    Element 20 of this Tuple21

    _21

    Element 21 of this Tuple21

  133. final case class Tuple22 [+T1, +T2, +T3, +T4, +T5, +T6, +T7, +T8, +T9, +T10, +T11, +T12, +T13, +T14, +T15, +T16, +T17, +T18, +T19, +T20, +T21, +T22](_1: T1, _2: T2, _3: T3, _4: T4, _5: T5, _6: T6, _7: T7, _8: T8, _9: T9, _10: T10, _11: T11, _12: T12, _13: T13, _14: T14, _15: T15, _16: T16, _17: T17, _18: T18, _19: T19, _20: T20, _21: T21, _22: T22) extends Product22[T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, T21, T22] with Product with Serializable

    A tuple of 22 elements; the canonical representation of a scala.Product22.

    A tuple of 22 elements; the canonical representation of a scala.Product22.

    _1

    Element 1 of this Tuple22

    _2

    Element 2 of this Tuple22

    _3

    Element 3 of this Tuple22

    _4

    Element 4 of this Tuple22

    _5

    Element 5 of this Tuple22

    _6

    Element 6 of this Tuple22

    _7

    Element 7 of this Tuple22

    _8

    Element 8 of this Tuple22

    _9

    Element 9 of this Tuple22

    _10

    Element 10 of this Tuple22

    _11

    Element 11 of this Tuple22

    _12

    Element 12 of this Tuple22

    _13

    Element 13 of this Tuple22

    _14

    Element 14 of this Tuple22

    _15

    Element 15 of this Tuple22

    _16

    Element 16 of this Tuple22

    _17

    Element 17 of this Tuple22

    _18

    Element 18 of this Tuple22

    _19

    Element 19 of this Tuple22

    _20

    Element 20 of this Tuple22

    _21

    Element 21 of this Tuple22

    _22

    Element 22 of this Tuple22

  134. final case class Tuple3 [+T1, +T2, +T3](_1: T1, _2: T2, _3: T3) extends Product3[T1, T2, T3] with Product with Serializable

    A tuple of 3 elements; the canonical representation of a scala.Product3.

    A tuple of 3 elements; the canonical representation of a scala.Product3.

    _1

    Element 1 of this Tuple3

    _2

    Element 2 of this Tuple3

    _3

    Element 3 of this Tuple3

  135. final case class Tuple4 [+T1, +T2, +T3, +T4](_1: T1, _2: T2, _3: T3, _4: T4) extends Product4[T1, T2, T3, T4] with Product with Serializable

    A tuple of 4 elements; the canonical representation of a scala.Product4.

    A tuple of 4 elements; the canonical representation of a scala.Product4.

    _1

    Element 1 of this Tuple4

    _2

    Element 2 of this Tuple4

    _3

    Element 3 of this Tuple4

    _4

    Element 4 of this Tuple4

  136. final case class Tuple5 [+T1, +T2, +T3, +T4, +T5](_1: T1, _2: T2, _3: T3, _4: T4, _5: T5) extends Product5[T1, T2, T3, T4, T5] with Product with Serializable

    A tuple of 5 elements; the canonical representation of a scala.Product5.

    A tuple of 5 elements; the canonical representation of a scala.Product5.

    _1

    Element 1 of this Tuple5

    _2

    Element 2 of this Tuple5

    _3

    Element 3 of this Tuple5

    _4

    Element 4 of this Tuple5

    _5

    Element 5 of this Tuple5

  137. final case class Tuple6 [+T1, +T2, +T3, +T4, +T5, +T6](_1: T1, _2: T2, _3: T3, _4: T4, _5: T5, _6: T6) extends Product6[T1, T2, T3, T4, T5, T6] with Product with Serializable

    A tuple of 6 elements; the canonical representation of a scala.Product6.

    A tuple of 6 elements; the canonical representation of a scala.Product6.

    _1

    Element 1 of this Tuple6

    _2

    Element 2 of this Tuple6

    _3

    Element 3 of this Tuple6

    _4

    Element 4 of this Tuple6

    _5

    Element 5 of this Tuple6

    _6

    Element 6 of this Tuple6

  138. final case class Tuple7 [+T1, +T2, +T3, +T4, +T5, +T6, +T7](_1: T1, _2: T2, _3: T3, _4: T4, _5: T5, _6: T6, _7: T7) extends Product7[T1, T2, T3, T4, T5, T6, T7] with Product with Serializable

    A tuple of 7 elements; the canonical representation of a scala.Product7.

    A tuple of 7 elements; the canonical representation of a scala.Product7.

    _1

    Element 1 of this Tuple7

    _2

    Element 2 of this Tuple7

    _3

    Element 3 of this Tuple7

    _4

    Element 4 of this Tuple7

    _5

    Element 5 of this Tuple7

    _6

    Element 6 of this Tuple7

    _7

    Element 7 of this Tuple7

  139. final case class Tuple8 [+T1, +T2, +T3, +T4, +T5, +T6, +T7, +T8](_1: T1, _2: T2, _3: T3, _4: T4, _5: T5, _6: T6, _7: T7, _8: T8) extends Product8[T1, T2, T3, T4, T5, T6, T7, T8] with Product with Serializable

    A tuple of 8 elements; the canonical representation of a scala.Product8.

    A tuple of 8 elements; the canonical representation of a scala.Product8.

    _1

    Element 1 of this Tuple8

    _2

    Element 2 of this Tuple8

    _3

    Element 3 of this Tuple8

    _4

    Element 4 of this Tuple8

    _5

    Element 5 of this Tuple8

    _6

    Element 6 of this Tuple8

    _7

    Element 7 of this Tuple8

    _8

    Element 8 of this Tuple8

  140. final case class Tuple9 [+T1, +T2, +T3, +T4, +T5, +T6, +T7, +T8, +T9](_1: T1, _2: T2, _3: T3, _4: T4, _5: T5, _6: T6, _7: T7, _8: T8, _9: T9) extends Product9[T1, T2, T3, T4, T5, T6, T7, T8, T9] with Product with Serializable

    A tuple of 9 elements; the canonical representation of a scala.Product9.

    A tuple of 9 elements; the canonical representation of a scala.Product9.

    _1

    Element 1 of this Tuple9

    _2

    Element 2 of this Tuple9

    _3

    Element 3 of this Tuple9

    _4

    Element 4 of this Tuple9

    _5

    Element 5 of this Tuple9

    _6

    Element 6 of this Tuple9

    _7

    Element 7 of this Tuple9

    _8

    Element 8 of this Tuple9

    _9

    Element 9 of this Tuple9

  141. final class UninitializedError extends RuntimeException

    This class represents uninitialized variable/value errors.

    This class represents uninitialized variable/value errors.

    Since

    2.5

  142. final case class UninitializedFieldError (msg: String) extends RuntimeException with Product with Serializable

    This class implements errors which are thrown whenever a field is used before it has been initialized.

    This class implements errors which are thrown whenever a field is used before it has been initialized.

    Such runtime checks are not emitted by default. They can be enabled by the -Xcheckinit compiler option.

    Since

    2.7

  143. abstract final class Unit extends AnyVal

    Unit is a subtype of scala.AnyVal.

    Unit is a subtype of scala.AnyVal. There is only one value of type Unit, (), and it is not represented by any object in the underlying runtime system. A method with return type Unit is analogous to a Java method which is declared void.

  144. type UnsupportedOperationException = java.lang.UnsupportedOperationException
  145. type Vector[+A] = scala.collection.immutable.Vector[A]
  146. class deprecated extends Annotation with StaticAnnotation

    An annotation that designates that a definition is deprecated.

    An annotation that designates that a definition is deprecated. A deprecation warning is issued upon usage of the annotated definition.

    Library authors should state the library's deprecation policy in their documentation to give developers guidance on how long a deprecated definition will be preserved.

    Library authors should prepend the name of their library to the version number to help developers distinguish deprecations coming from different libraries:

    @deprecated("this method will be removed", "FooLib 12.0")
    def oldMethod(x: Int) = ...

    The compiler will emit deprecation warnings grouped by library and version:

    oldMethod(1)
    oldMethod(2)
    aDeprecatedMethodFromLibraryBar(3, 4)
    
    // warning: there was one deprecation warning (since BarLib 3.2)
    // warning: there were two deprecation warnings (since FooLib 12.0)
    // warning: there were three deprecation warnings in total; re-run with -deprecation for details

    @deprecated in the Scala language and its standard library

    A deprecated element of the Scala language or a definition in the Scala standard library will be preserved at least for the current major version.

    This means that an element deprecated in some 2.12.x release will be preserved in all 2.12.x releases, but may be removed in 2.13. (A deprecated element might be kept longer to ease migration. Developers should not rely on this.)

    Special deprecation policy for Scala 2.12
    The Scala team has decided to enact a special deprecation policy for Scala 2.12:

    As an upgrade from 2.11 to 2.12 also requires upgrading from Java 6 to Java 8, deprecated elements will not normally be removed in this release, to ease migration and cross-building.

    Annotations
    @getter() @setter() @beanGetter() @beanSetter()
    Since

    2.3

    See also

    scala.deprecatedName

    scala.deprecatedOverriding

    scala.deprecatedInheritance

    The official documentation on binary compatibility.

  147. class deprecatedInheritance extends Annotation with StaticAnnotation

    An annotation that designates that inheriting from a class is deprecated.

    An annotation that designates that inheriting from a class is deprecated.

    This is usually done to warn about a non-final class being made final in a future version. Sub-classing such a class then generates a warning.

    No warnings are generated if the subclass is in the same compilation unit.

    Library authors should state the library's deprecation policy in their documentation to give developers guidance on when a type annotated with @deprecatedInheritance will be finalized.

    Library authors should prepend the name of their library to the version number to help developers distinguish deprecations coming from different libraries:

    @deprecatedInheritance("this class will be made final", "FooLib 12.0")
    class Foo
    val foo = new Foo     // no deprecation warning
    class Bar extends Foo
    // warning: inheritance from class Foo is deprecated (since FooLib 12.0): this class will be made final
    // class Bar extends Foo
    //                   ^
    Annotations
    @getter() @setter() @beanGetter() @beanSetter()
    Since

    2.10

    See also

    scala.deprecatedName

    scala.deprecatedOverriding

    scala.deprecated

  148. class deprecatedName extends Annotation with StaticAnnotation

    An annotation that designates that the name of a parameter is deprecated.

    An annotation that designates that the name of a parameter is deprecated.

    Using this name in a named argument generates a deprecation warning.

    Library authors should state the library's deprecation policy in their documentation to give developers guidance on how long a deprecated name will be preserved.

    Library authors should prepend the name of their library to the version number to help developers distinguish deprecations coming from different libraries:

    def inc(x: Int, @deprecatedName('y, "FooLib 12.0") n: Int): Int = x + n
    inc(1, y = 2)

    will produce the following warning:

    warning: the parameter name y is deprecated (since FooLib 12.0): use n instead
    inc(1, y = 2)
             ^
    Annotations
    @param()
    Since

    2.8.1

    See also

    scala.deprecatedOverriding

    scala.deprecatedInheritance

    scala.deprecated

  149. class deprecatedOverriding extends Annotation with StaticAnnotation

    An annotation that designates that overriding a member is deprecated.

    An annotation that designates that overriding a member is deprecated.

    Overriding such a member in a sub-class then generates a warning.

    Library authors should state the library's deprecation policy in their documentation to give developers guidance on when a method annotated with @deprecatedOverriding will be finalized.

    Library authors should prepend the name of their library to the version number to help developers distinguish deprecations coming from different libraries:

    class Foo {
      @deprecatedOverriding("this method will be made final", "FooLib 12.0")
      def add(x: Int, y: Int) = x + y
    }
    class Bar extends Foo // no deprecation warning
    class Baz extends Foo {
      override def add(x: Int, y: Int) = x - y
    }
    // warning: overriding method add in class Foo is deprecated (since FooLib 12.0): this method will be made final
    // override def add(x: Int, y: Int) = x - y
    //              ^
    Annotations
    @getter() @setter() @beanGetter() @beanSetter()
    Since

    2.10

    See also

    scala.deprecatedName

    scala.deprecatedInheritance

    scala.deprecated

  150. class inline extends Annotation with StaticAnnotation

    An annotation on methods that requests that the compiler should try especially hard to inline the annotated method.

    An annotation on methods that requests that the compiler should try especially hard to inline the annotated method. The annotation can be used at definition site or at callsite.

    @inline   final def f1(x: Int) = x
    @noinline final def f2(x: Int) = x
              final def f3(x: Int) = x
    
     def t1 = f1(1)              // inlined if possible
     def t2 = f2(1)              // not inlined
     def t3 = f3(1)              // may be inlined (heuristics)
     def t4 = f1(1): @noinline   // not inlined (override at callsite)
     def t5 = f2(1): @inline     // inlined if possible (override at callsite)
     def t6 = f3(1): @inline     // inlined if possible
     def t7 = f3(1): @noinline   // not inlined
    }

    Note: parentheses are required when annotating a callsite within a larger expression.

    def t1 = f1(1) + f1(1): @noinline   // equivalent to (f1(1) + f1(1)): @noinline
    def t2 = f1(1) + (f1(1): @noinline) // the second call to f1 is not inlined
    Version

    1.0, 2007-5-21

  151. class native extends Annotation with StaticAnnotation

    Marker for native methods.

    Marker for native methods.

    @native def f(x: Int, y: List[Long]): String = ...

    A @native method is compiled to the platform's native method, while discarding the method's body (if any). The body will be type checked if present.

    A method marked @native must be a member of a class, not a trait (since 2.12).

    Since

    2.6

  152. class noinline extends Annotation with StaticAnnotation

    An annotation on methods that forbids the compiler to inline the method, no matter how safe the inlining appears to be.

    An annotation on methods that forbids the compiler to inline the method, no matter how safe the inlining appears to be. The annotation can be used at definition site or at callsite.

    @inline   final def f1(x: Int) = x
    @noinline final def f2(x: Int) = x
              final def f3(x: Int) = x
    
     def t1 = f1(1)              // inlined if possible
     def t2 = f2(1)              // not inlined
     def t3 = f3(1)              // may be inlined (heuristics)
     def t4 = f1(1): @noinline   // not inlined (override at callsite)
     def t5 = f2(1): @inline     // inlined if possible (override at callsite)
     def t6 = f3(1): @inline     // inlined if possible
     def t7 = f3(1): @noinline   // not inlined
    }

    Note: parentheses are required when annotating a callsite within a larger expression.

    def t1 = f1(1) + f1(1): @noinline   // equivalent to (f1(1) + f1(1)): @noinline
    def t2 = f1(1) + (f1(1): @noinline) // the second call to f1 is not inlined
    Version

    1.0, 2007-5-21

    Since

    2.5

  153. class specialized extends Annotation with StaticAnnotation

    Annotate type parameters on which code should be automatically specialized.

    Annotate type parameters on which code should be automatically specialized. For example:

    class MyList[@specialized T] ...

    Type T can be specialized on a subset of the primitive types by specifying a list of primitive types to specialize at:

    class MyList[@specialized(Int, Double, Boolean) T] ..
    Since

    2.8

  154. class throws [T <: Throwable] extends Annotation with StaticAnnotation

    Annotation for specifying the exceptions thrown by a method.

    Annotation for specifying the exceptions thrown by a method. For example:

    class Reader(fname: String) {
      private val in = new BufferedReader(new FileReader(fname))
      @throws[IOException]("if the file doesn't exist")
      def read() = in.read()
    }
    Version

    1.0, 19/05/2006

    Since

    2.1

  155. class transient extends Annotation with StaticAnnotation
    Annotations
    @field()
  156. class unchecked extends Annotation

    An annotation to designate that the annotated entity should not be considered for additional compiler checks.

    An annotation to designate that the annotated entity should not be considered for additional compiler checks. Specific applications include annotating the subject of a match expression to suppress exhaustiveness warnings, and annotating a type argument in a match case to suppress unchecked warnings.

    Such suppression should be used with caution, without which one may encounter scala.MatchError or java.lang.ClassCastException at runtime. In most cases one can and should address the warning instead of suppressing it.

    object Test extends App {
      // This would normally warn "match is not exhaustive"
      // because `None` is not covered.
      def f(x: Option[String]) = (x: @unchecked) match { case Some(y) => y }
      // This would normally warn "type pattern is unchecked"
      // but here will blindly cast the head element to String.
      def g(xs: Any) = xs match { case x: List[String @unchecked] => x.head }
    }
    Since

    2.4

  157. class volatile extends Annotation with StaticAnnotation
    Annotations
    @field()
  158. trait DelayedInit extends AnyRef

    Classes and objects (but note, not traits) inheriting the DelayedInit marker trait will have their initialization code rewritten as follows: code becomes delayedInit(code).

    Classes and objects (but note, not traits) inheriting the DelayedInit marker trait will have their initialization code rewritten as follows: code becomes delayedInit(code).

    Initialization code comprises all statements and all value definitions that are executed during initialization.

    Example:

    trait Helper extends DelayedInit {
      def delayedInit(body: => Unit) = {
        println("dummy text, printed before initialization of C")
        body // evaluates the initialization code of C
      }
    }
    
    class C extends Helper {
      println("this is the initialization code of C")
    }
    
    object Test extends App {
      val c = new C
    }

    Should result in the following being printed:

    dummy text, printed before initialization of C
    this is the initialization code of C
    Annotations
    @deprecated
    Deprecated

    (Since version 2.11.0) DelayedInit semantics can be surprising. Support for App will continue. See the release notes for more details: https://github.com/scala/scala/releases/tag/v2.11.0-RC1

    See also

    "Delayed Initialization" subsection of the Scala Language Specification (section 5.1)

  159. trait NotNull extends Any

    A marker trait for things that are not allowed to be null

    A marker trait for things that are not allowed to be null

    Annotations
    @deprecated
    Deprecated

    (Since version 2.11.0) this trait will be removed

    Since

    2.5

  160. abstract class Responder [+A] extends Serializable

    Instances of responder are the building blocks of small programs written in continuation passing style.

    Instances of responder are the building blocks of small programs written in continuation passing style. By using responder classes in for comprehensions, one can embed domain-specific languages in Scala while giving the impression that programs in these DSLs are written in direct style.

    Annotations
    @deprecated
    Deprecated

    (Since version 2.11.0) this class will be removed

    Version

    1.0

    Since

    2.1

  161. class remote extends Annotation with StaticAnnotation

    An annotation that designates the class to which it is applied as remotable.

    An annotation that designates the class to which it is applied as remotable.

    For instance, the Scala code

    @remote trait Hello {
      def sayHello(): String
    }

    is equivalent to the following Java code:

    public interface Hello extends java.rmi.Remote {
        String sayHello() throws java.rmi.RemoteException;
    }
    Annotations
    @deprecated
    Deprecated

    (Since version 2.12.0) extend java.rmi.Remote instead and add @throws[java.rmi.RemoteException] to public methods

Value Members

  1. val #::: scala.collection.immutable.Stream.#::.type
  2. val +:: scala.collection.+:.type
  3. val :+: scala.collection.:+.type
  4. val ::: scala.collection.immutable.::.type
  5. val AnyRef: Specializable
  6. val BigDecimal: scala.math.BigDecimal.type
  7. val BigInt: scala.math.BigInt.type
  8. val Either: scala.util.Either.type
  9. val Equiv: scala.math.Equiv.type
  10. val Fractional: scala.math.Fractional.type
  11. val IndexedSeq: scala.collection.IndexedSeq.type
  12. val Integral: scala.math.Integral.type
  13. val Iterable: scala.collection.Iterable.type
  14. val Iterator: scala.collection.Iterator.type
  15. val Left: scala.util.Left.type
  16. val List: scala.collection.immutable.List.type
  17. val Nil: scala.collection.immutable.Nil.type
  18. val Numeric: scala.math.Numeric.type
  19. val Ordered: scala.math.Ordered.type
  20. val Ordering: scala.math.Ordering.type
  21. val Range: scala.collection.immutable.Range.type
  22. val Right: scala.util.Right.type
  23. val Seq: scala.collection.Seq.type
  24. val Stream: scala.collection.immutable.Stream.type
  25. val StringBuilder: scala.collection.mutable.StringBuilder.type
  26. val Traversable: scala.collection.Traversable.type
  27. val Vector: scala.collection.immutable.Vector.type
  28. object Array extends FallbackArrayBuilding with Serializable

    Utility methods for operating on arrays.

    Utility methods for operating on arrays. For example:

    val a = Array(1, 2)
    val b = Array.ofDim[Int](2)
    val c = Array.concat(a, b)

    where the array objects a, b and c have respectively the values Array(1, 2), Array(0, 0) and Array(1, 2, 0, 0).

    Version

    1.0

  29. object Boolean extends AnyValCompanion
  30. object Byte extends AnyValCompanion
  31. object Char extends AnyValCompanion
  32. object Console extends DeprecatedConsole with AnsiColor

    Implements functionality for printing Scala values on the terminal.

    Implements functionality for printing Scala values on the terminal. For reading values use StdIn. Also defines constants for marking up text on ANSI terminals.

    Console Output

    Use the print methods to output text.

    scala> Console.printf(
      "Today the outside temperature is a balmy %.1f°C. %<.1f°C beats the previous record of %.1f°C.\n",
      -137.0,
      -135.05)
    Today the outside temperature is a balmy -137.0°C. -137.0°C beats the previous record of -135.1°C.

    ANSI escape codes

    Use the ANSI escape codes for colorizing console output either to STDOUT or STDERR.

    import Console.{GREEN, RED, RESET, YELLOW_B, UNDERLINED}
    
    object PrimeTest {
    
      def isPrime(): Unit = {
    
        val candidate = io.StdIn.readInt().ensuring(_ > 1)
    
        val prime = (2 to candidate - 1).forall(candidate % _ != 0)
    
        if (prime)
          Console.println(s"${RESET}${GREEN}yes${RESET}")
        else
          Console.err.println(s"${RESET}${YELLOW_B}${RED}${UNDERLINED}NO!${RESET}")
      }
    
      def main(args: Array[String]): Unit = isPrime()
    
    }

    $ scala PrimeTest
    1234567891
    yes
    $ scala PrimeTest
    56474
    NO!

    IO redefinition

    Use IO redefinition to temporarily swap in a different set of input and/or output streams. In this example the stream based method above is wrapped into a function.

    import java.io.{ByteArrayOutputStream, StringReader}
    
    object FunctionalPrimeTest {
    
      def isPrime(candidate: Int): Boolean = {
    
        val input = new StringReader(s"$candidate\n")
        val outCapture = new ByteArrayOutputStream
        val errCapture = new ByteArrayOutputStream
    
        Console.withIn(input) {
          Console.withOut(outCapture) {
            Console.withErr(errCapture) {
              PrimeTest.isPrime()
            }
          }
        }
    
        if (outCapture.toByteArray.nonEmpty) // "yes"
          true
        else if (errCapture.toByteArray.nonEmpty) // "NO!"
          false
        else throw new IllegalArgumentException(candidate.toString)
      }
    
      def main(args: Array[String]): Unit = {
        val primes = (2 to 50) filter (isPrime)
        println(s"First primes: $primes")
      }
    
    }

    $ scala FunctionalPrimeTest
    First primes: Vector(2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47)

    Version

    1.0, 03/09/2003

  33. object Double extends AnyValCompanion
  34. object Float extends AnyValCompanion
  35. object Function

    A module defining utility methods for higher-order functional programming.

    A module defining utility methods for higher-order functional programming.

    Version

    1.0, 29/11/2006

  36. object Int extends AnyValCompanion
  37. object Long extends AnyValCompanion
  38. object None extends Option[Nothing] with Product with Serializable

    This case object represents non-existent values.

    This case object represents non-existent values.

    Annotations
    @SerialVersionUID()
    Version

    1.0, 16/07/2003

  39. object Option extends Serializable
  40. object PartialFunction

    A few handy operations which leverage the extra bit of information available in partial functions.

    A few handy operations which leverage the extra bit of information available in partial functions. Examples:

    import PartialFunction._
    
    def strangeConditional(other: Any): Boolean = cond(other) {
      case x: String if x == "abc" || x == "def"  => true
      case x: Int => true
    }
    def onlyInt(v: Any): Option[Int] = condOpt(v) { case x: Int => x }
    Since

    2.8

  41. object Predef extends LowPriorityImplicits with DeprecatedPredef

    The Predef object provides definitions that are accessible in all Scala compilation units without explicit qualification.

    The Predef object provides definitions that are accessible in all Scala compilation units without explicit qualification.

    Commonly Used Types

    Predef provides type aliases for types which are commonly used, such as the immutable collection types scala.collection.immutable.Map, scala.collection.immutable.Set, and the scala.collection.immutable.List constructors (scala.collection.immutable.:: and scala.collection.immutable.Nil).

    Console Output

    For basic console output, Predef provides convenience methods print and println, which are aliases of the methods in the object scala.Console.

    Assertions

    A set of assert functions are provided for use as a way to document and dynamically check invariants in code. Invocations of assert can be elided at compile time by providing the command line option -Xdisable-assertions, which raises -Xelide-below above elidable.ASSERTION, to the scalac command.

    Variants of assert intended for use with static analysis tools are also provided: assume, require and ensuring. require and ensuring are intended for use as a means of design-by-contract style specification of pre- and post-conditions on functions, with the intention that these specifications could be consumed by a static analysis tool. For instance,

    def addNaturals(nats: List[Int]): Int = {
      require(nats forall (_ >= 0), "List contains negative numbers")
      nats.foldLeft(0)(_ + _)
    } ensuring(_ >= 0)

    The declaration of addNaturals states that the list of integers passed should only contain natural numbers (i.e. non-negative), and that the result returned will also be natural. require is distinct from assert in that if the condition fails, then the caller of the function is to blame rather than a logical error having been made within addNaturals itself. ensuring is a form of assert that declares the guarantee the function is providing with regards to its return value.

    Implicit Conversions

    A number of commonly applied implicit conversions are also defined here, and in the parent type scala.LowPriorityImplicits. Implicit conversions are provided for the "widening" of numeric values, for instance, converting a Short value to a Long value as required, and to add additional higher-order functions to Array values. These are described in more detail in the documentation of scala.Array.

  42. object Product1
  43. object Product10
  44. object Product11
  45. object Product12
  46. object Product13
  47. object Product14
  48. object Product15
  49. object Product16
  50. object Product17
  51. object Product18
  52. object Product19
  53. object Product2
  54. object Product20
  55. object Product21
  56. object Product22
  57. object Product3
  58. object Product4
  59. object Product5
  60. object Product6
  61. object Product7
  62. object Product8
  63. object Product9
  64. object Proxy
  65. object Short extends AnyValCompanion
  66. object Specializable
  67. object StringContext extends Serializable
  68. object Symbol extends UniquenessCache[String, Symbol] with Serializable
  69. object Unit extends AnyValCompanion
  70. object language

    The scala.language object controls the language features available to the programmer, as proposed in the SIP-18 document.

    The scala.language object controls the language features available to the programmer, as proposed in the SIP-18 document.

    Each of these features has to be explicitly imported into the current scope to become available:

    import language.postfixOps // or language._
    List(1, 2, 3) reverse

    The language features are:

  71. object languageFeature

Deprecated Value Members

  1. object Responder extends Serializable

    This object contains utility methods to build responders.

    This object contains utility methods to build responders.

    Annotations
    @deprecated
    Deprecated

    (Since version 2.11.0) this object will be removed

    Version

    1.0

    Since

    2.1

    See also

    class Responder

Inherited from AnyRef

Inherited from Any

Ungrouped