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Showing content from https://scala-lang.org/api/3.x/scala/Enumeration.html below:

Enumeration

scala.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 enumeration.

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).

Values SHOULD NOT be added to an enumeration after its construction; doing so makes the enumeration thread-unsafe. If values are added to an enumeration from multiple threads (in a non-synchronized fashion) after construction, the behavior of the enumeration is undefined.

initial

The initial value from which to count the integers that identifies values at run-time.

Example

// 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

// Example of adding attributes to an enumeration by extending the Enumeration.Val class
object Planet extends Enumeration {
 protected case class PlanetVal(mass: Double, radius: Double) extends super.Val {
   def surfaceGravity: Double = Planet.G * mass / (radius * radius)
   def surfaceWeight(otherMass: Double): Double = otherMass * surfaceGravity
 }
 import scala.language.implicitConversions
 implicit def valueToPlanetVal(x: Value): PlanetVal = x.asInstanceOf[PlanetVal]
 val G: Double = 6.67300E-11
 val Mercury = PlanetVal(3.303e+23, 2.4397e6)
 val Venus   = PlanetVal(4.869e+24, 6.0518e6)
 val Earth   = PlanetVal(5.976e+24, 6.37814e6)
 val Mars    = PlanetVal(6.421e+23, 3.3972e6)
 val Jupiter = PlanetVal(1.9e+27, 7.1492e7)
 val Saturn  = PlanetVal(5.688e+26, 6.0268e7)
 val Uranus  = PlanetVal(8.686e+25, 2.5559e7)
 val Neptune = PlanetVal(1.024e+26, 2.4746e7)
}
println(Planet.values.filter(_.radius > 7.0e6))
// output:
// Planet.ValueSet(Jupiter, Saturn, Uranus, Neptune)

Source

Enumeration.scala

Graph

Supertypes

Known subtypes

Self type

The type of the enumerated values.

The type of the enumerated values.

Source

Enumeration.scala

Supertypes

Known subtypes

An ordering by id for values of this set

An ordering by id for values of this set

Source

Enumeration.scala

Supertypes

Self type

A class for sets of values.

A class for sets of values. Iterating through this set will yield values in increasing order of their ids.

nnIds

The set of ids of values (adjusted so that the lowest value does not fall below zero), organized as a BitSet.

Companion

object

Source

Enumeration.scala

Supertypes

A factory object for value sets

Creates a fresh value, part of this enumeration.

Creates a fresh value, part of this enumeration, identified by the integer i.

Creates a fresh value, part of this enumeration, identified by the integer i.

i

An integer that identifies this value at run-time. It must be unique amongst all values of the enumeration.

Returns

Fresh value identified by i.

Source

Enumeration.scala

Creates a fresh value, part of this enumeration, called name.

Creates a fresh value, part of this enumeration, called name.

name

A human-readable name for that value.

Returns

Fresh value called name.

Source

Enumeration.scala

Creates a fresh value, part of this enumeration, called name and identified by the integer i.

Creates a fresh value, part of this enumeration, called name and identified by the integer i.

i

An integer that identifies this value at run-time. It must be unique amongst all values of the enumeration.

name

A human-readable name for that value.

Returns

Fresh value with the provided identifier i and name name.

Source

Enumeration.scala

The value of this enumeration with given id x

The one higher than the highest integer amongst those used to identify values in this enumeration.

The one higher than the highest integer amongst those used to identify values in this enumeration.

Source

Enumeration.scala

The name of this enumeration.

The values of this enumeration as a set.

Return a Value from this Enumeration whose name matches the argument s.

Return a Value from this Enumeration whose name matches the argument s. The names are determined automatically via reflection.

s

an Enumeration name

Returns

the Value of this Enumeration if its name matches s

Throws

Source

Enumeration.scala

The integer to use to identify the next created value.

The integer to use to identify the next created value.

Source

Enumeration.scala

The string to use to name the next created value.

The string to use to name the next created value.

Source

Enumeration.scala

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