scala

package scala

Core Scala types. They are always available without an explicit import.

Source: package.scala

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type ::[A] = scala.collection.immutable.::[A]
type AbstractMethodError = java.lang.AbstractMethodError
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.
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:
- The subrange types are scala.Byte, scala.Short, and scala.Char.
- The integer types include the subrange types as well as scala.Int and scala.Long.
- The floating point types are scala.Float and scala.Double.
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.
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
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.)
type ArrayIndexOutOfBoundsException = java.lang.ArrayIndexOutOfBoundsException
type BigDecimal = scala.math.BigDecimal
type BigInt = scala.math.BigInt
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.
type BufferedIterator[+A] = scala.collection.BufferedIterator[A]
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.
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.
type ClassCastException = java.lang.ClassCastException
trait Cloneable extends java.lang.Cloneable
Classes extending this trait are cloneable across platforms (Java, .NET).
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.
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.
type Either[+A, +B] = scala.util.Either[A, B]

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()

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.
type Equiv[T] = scala.math.Equiv[T]
type Error = java.lang.Error
type Exception = java.lang.Exception
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.
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.
type Fractional[T] = scala.math.Fractional[T]

trait Function0[+R] extends AnyRef

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())
}

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 = ... )
trait Function10[-T1, -T2, -T3, -T4, -T5, -T6, -T7, -T8, -T9, -T10, +R] extends AnyRef
A function of 10 parameters.
trait Function11[-T1, -T2, -T3, -T4, -T5, -T6, -T7, -T8, -T9, -T10, -T11, +R] extends AnyRef
A function of 11 parameters.
trait Function12[-T1, -T2, -T3, -T4, -T5, -T6, -T7, -T8, -T9, -T10, -T11, -T12, +R] extends AnyRef
A function of 12 parameters.
trait Function13[-T1, -T2, -T3, -T4, -T5, -T6, -T7, -T8, -T9, -T10, -T11, -T12, -T13, +R] extends AnyRef
A function of 13 parameters.
trait Function14[-T1, -T2, -T3, -T4, -T5, -T6, -T7, -T8, -T9, -T10, -T11, -T12, -T13, -T14, +R] extends AnyRef
A function of 14 parameters.
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.
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.
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.
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.
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.

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

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))
}

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.
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.
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.
trait Function3[-T1, -T2, -T3, +R] extends AnyRef
A function of 3 parameters.
trait Function4[-T1, -T2, -T3, -T4, +R] extends AnyRef
A function of 4 parameters.
trait Function5[-T1, -T2, -T3, -T4, -T5, +R] extends AnyRef
A function of 5 parameters.
trait Function6[-T1, -T2, -T3, -T4, -T5, -T6, +R] extends AnyRef
A function of 6 parameters.
trait Function7[-T1, -T2, -T3, -T4, -T5, -T6, -T7, +R] extends AnyRef
A function of 7 parameters.
trait Function8[-T1, -T2, -T3, -T4, -T5, -T6, -T7, -T8, +R] extends AnyRef
A function of 8 parameters.
trait Function9[-T1, -T2, -T3, -T4, -T5, -T6, -T7, -T8, -T9, +R] extends AnyRef
A function of 9 parameters.
type IllegalArgumentException = java.lang.IllegalArgumentException
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
type IndexOutOfBoundsException = java.lang.IndexOutOfBoundsException
type IndexedSeq[+A] = scala.collection.IndexedSeq[A]
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.
type Integral[T] = scala.math.Integral[T]
type InterruptedException = java.lang.InterruptedException
type Iterable[+A] = scala.collection.Iterable[A]
type Iterator[+A] = scala.collection.Iterator[A]
type Left[+A, +B] = scala.util.Left[A, B]
type List[+A] = scala.collection.immutable.List[A]
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.
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
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
type NoSuchElementException = java.util.NoSuchElementException
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.???.
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.
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.
type NullPointerException = java.lang.NullPointerException
type NumberFormatException = java.lang.NumberFormatException
type Numeric[T] = scala.math.Numeric[T]
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.
type Ordered[T] = scala.math.Ordered[T]
type Ordering[T] = scala.math.Ordering[T]
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
type PartialOrdering[T] = scala.math.PartialOrdering[T]
type PartiallyOrdered[T] = scala.math.PartiallyOrdered[T]
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
trait Product1[+T1] extends Product
Product1 is a Cartesian product of 1 component.
Product1 is a Cartesian product of 1 component.

Since
2.3
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
type Range = scala.collection.immutable.Range
type Right[+A, +B] = scala.util.Right[A, B]
type RuntimeException = java.lang.RuntimeException
case class ScalaReflectionException(msg: String) extends Exception with Product with Serializable
An exception that indicates an error during Scala reflection
type Seq[+A] = scala.collection.Seq[A]
class SerialVersionUID extends Annotation with ClassfileAnnotation
Annotation for specifying the static SerialVersionUID field of a serializable class.
trait Serializable extends java.io.Serializable
Classes extending this trait are serializable across platforms (Java, .NET).
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.
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
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.
type Stream[+A] = scala.collection.immutable.Stream[A]
type StringBuilder = scala.collection.mutable.StringBuilder
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
type StringIndexOutOfBoundsException = java.lang.StringIndexOutOfBoundsException
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
type Throwable = java.lang.Throwable
type Traversable[+A] = scala.collection.Traversable[A]
type TraversableOnce[+A] = scala.collection.TraversableOnce[A]
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
final class UninitializedError extends RuntimeException
This class represents uninitialized variable/value errors.
This class represents uninitialized variable/value errors.

Since
2.5
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
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.
type UnsupportedOperationException = java.lang.UnsupportedOperationException
type Vector[+A] = scala.collection.immutable.Vector[A]
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.
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
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
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

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

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

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

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
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
class transient extends Annotation with StaticAnnotation

Annotations
@field()
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
class volatile extends Annotation with StaticAnnotation

Annotations
@field()
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)
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
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
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

val #::: scala.collection.immutable.Stream.#::.type
val +:: scala.collection.+:.type
val :+: scala.collection.:+.type
val ::: scala.collection.immutable.::.type
val AnyRef: Specializable
val BigDecimal: scala.math.BigDecimal.type
val BigInt: scala.math.BigInt.type
val Either: scala.util.Either.type
val Equiv: scala.math.Equiv.type
val Fractional: scala.math.Fractional.type
val IndexedSeq: scala.collection.IndexedSeq.type
val Integral: scala.math.Integral.type
val Iterable: scala.collection.Iterable.type
val Iterator: scala.collection.Iterator.type
val Left: scala.util.Left.type
val List: scala.collection.immutable.List.type
val Nil: scala.collection.immutable.Nil.type
val Numeric: scala.math.Numeric.type
val Ordered: scala.math.Ordered.type
val Ordering: scala.math.Ordering.type
val Range: scala.collection.immutable.Range.type
val Right: scala.util.Right.type
val Seq: scala.collection.Seq.type
val Stream: scala.collection.immutable.Stream.type
val StringBuilder: scala.collection.mutable.StringBuilder.type
val Traversable: scala.collection.Traversable.type
val Vector: scala.collection.immutable.Vector.type
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
object Boolean extends AnyValCompanion
object Byte extends AnyValCompanion
object Char extends AnyValCompanion

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

object Double extends AnyValCompanion
object Float extends AnyValCompanion
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
object Int extends AnyValCompanion
object Long extends AnyValCompanion
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
object Option extends Serializable

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

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.
object Product1
object Product10
object Product11
object Product12
object Product13
object Product14
object Product15
object Product16
object Product17
object Product18
object Product19
object Product2
object Product20
object Product21
object Product22
object Product3
object Product4
object Product5
object Product6
object Product7
object Product8
object Product9
object Proxy
object Short extends AnyValCompanion
object Specializable
object StringContext extends Serializable
object Symbol extends UniquenessCache[String, Symbol] with Serializable
object Unit extends AnyValCompanion
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:
- dynamics enables defining calls rewriting using the Dynamic trait
- postfixOps enables postfix operators
- reflectiveCalls enables using structural types
- implicitConversions enables defining implicit methods and members
- higherKinds enables writing higher-kinded types
- existentials enables writing existential types
- experimental contains newer features that have not yet been tested in production
object languageFeature

Deprecated Value Members

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

Packages

Package structure

Automatic imports

Guide

Using Collections

Creating Collections

Converting to and from Java Collections

Guide

Common Imports

Specifying Durations

Using Futures For Non-blocking Computation

Avoid Blocking

scala

package scala

Type Members

Caveats

Value Members

Console Output

ANSI escape codes

IO redefinition

Commonly Used Types

Console Output

Assertions

Implicit Conversions

Deprecated Value Members

Inherited from AnyRef

Inherited from Any

Ungrouped

Packages

Package structure

Automatic imports

Guide

Using Collections

Creating Collections

Converting to and from Java Collections

Guide

Common Imports

Specifying Durations

Using Futures For Non-blocking Computation

Avoid Blocking

scala 

package scala

Type Members

Caveats

Value Members

Console Output

ANSI escape codes

IO redefinition

Commonly Used Types

Console Output

Assertions

Implicit Conversions

Deprecated Value Members

Inherited from AnyRef

Inherited from Any

Ungrouped

scala