trait Fractional[T] extends Numeric[T]
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- Fractional
- Numeric
- Ordering
- PartialOrdering
- Equiv
- Serializable
- Serializable
- Comparator
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Abstract Value Members
-
abstract
def
compare(x: T, y: T): Int
Returns an integer whose sign communicates how x compares to y.
Returns an integer whose sign communicates how x compares to y.
The result sign has the following meaning:
- negative if x < y
- positive if x > y
- zero otherwise (if x == y)
- Definition Classes
- Ordering → Comparator
- abstract def div(x: T, y: T): T
-
abstract
def
fromInt(x: Int): T
- Definition Classes
- Numeric
-
abstract
def
minus(x: T, y: T): T
- Definition Classes
- Numeric
-
abstract
def
negate(x: T): T
- Definition Classes
- Numeric
-
abstract
def
plus(x: T, y: T): T
- Definition Classes
- Numeric
-
abstract
def
times(x: T, y: T): T
- Definition Classes
- Numeric
-
abstract
def
toDouble(x: T): Double
- Definition Classes
- Numeric
-
abstract
def
toFloat(x: T): Float
- Definition Classes
- Numeric
-
abstract
def
toInt(x: T): Int
- Definition Classes
- Numeric
-
abstract
def
toLong(x: T): Long
- Definition Classes
- Numeric
Concrete Value Members
-
def
abs(x: T): T
- Definition Classes
- Numeric
-
def
equiv(x: T, y: T): Boolean
Return true if
x
==y
in the ordering.Return true if
x
==y
in the ordering.- Definition Classes
- Ordering → PartialOrdering → Equiv
-
def
gt(x: T, y: T): Boolean
Return true if
x
>y
in the ordering.Return true if
x
>y
in the ordering.- Definition Classes
- Ordering → PartialOrdering
-
def
gteq(x: T, y: T): Boolean
Return true if
x
>=y
in the ordering.Return true if
x
>=y
in the ordering.- Definition Classes
- Ordering → PartialOrdering
-
def
lt(x: T, y: T): Boolean
Return true if
x
<y
in the ordering.Return true if
x
<y
in the ordering.- Definition Classes
- Ordering → PartialOrdering
-
def
lteq(x: T, y: T): Boolean
Return true if
x
<=y
in the ordering.Return true if
x
<=y
in the ordering.- Definition Classes
- Ordering → PartialOrdering
-
def
max(x: T, y: T): T
Return
x
ifx
>=y
, otherwisey
.Return
x
ifx
>=y
, otherwisey
.- Definition Classes
- Ordering
-
def
min(x: T, y: T): T
Return
x
ifx
<=y
, otherwisey
.Return
x
ifx
<=y
, otherwisey
.- Definition Classes
- Ordering
-
implicit
def
mkNumericOps(lhs: T): FractionalOps
- Definition Classes
- Fractional → Numeric
-
implicit
def
mkOrderingOps(lhs: T): Fractional.Ops
This implicit method augments
T
with the comparison operators defined inscala.math.Ordering.Ops
.This implicit method augments
T
with the comparison operators defined inscala.math.Ordering.Ops
.- Definition Classes
- Ordering
-
def
on[U](f: (U) ⇒ T): Ordering[U]
Given f, a function from U into T, creates an Ordering[U] whose compare function is equivalent to:
Given f, a function from U into T, creates an Ordering[U] whose compare function is equivalent to:
def compare(x:U, y:U) = Ordering[T].compare(f(x), f(y))
- Definition Classes
- Ordering
-
def
one: T
- Definition Classes
- Numeric
-
def
reverse: Ordering[T]
Return the opposite ordering of this one.
Return the opposite ordering of this one.
- Definition Classes
- Ordering → PartialOrdering
-
def
reversed(): Comparator[T]
- Definition Classes
- Comparator
-
def
signum(x: T): Int
- Definition Classes
- Numeric
-
def
thenComparing[U <: Comparable[_ >: U]](arg0: java.util.function.Function[_ >: T, _ <: U]): Comparator[T]
- Definition Classes
- Comparator
-
def
thenComparing[U](arg0: java.util.function.Function[_ >: T, _ <: U], arg1: Comparator[_ >: U]): Comparator[T]
- Definition Classes
- Comparator
-
def
thenComparing(arg0: Comparator[_ >: T]): Comparator[T]
- Definition Classes
- Comparator
-
def
thenComparingDouble(arg0: ToDoubleFunction[_ >: T]): Comparator[T]
- Definition Classes
- Comparator
-
def
thenComparingInt(arg0: ToIntFunction[_ >: T]): Comparator[T]
- Definition Classes
- Comparator
-
def
thenComparingLong(arg0: ToLongFunction[_ >: T]): Comparator[T]
- Definition Classes
- Comparator
-
def
tryCompare(x: T, y: T): Some[Int]
Returns whether a comparison between
x
andy
is defined, and if so the result ofcompare(x, y)
.Returns whether a comparison between
x
andy
is defined, and if so the result ofcompare(x, y)
.- Definition Classes
- Ordering → PartialOrdering
-
def
zero: T
- Definition Classes
- Numeric
This is the documentation for the Scala standard library.
Package structure
The scala package contains core types like
Int
,Float
,Array
orOption
which are accessible in all Scala compilation units without explicit qualification or imports.Notable packages include:
scala.collection
and its sub-packages contain Scala's collections frameworkscala.collection.immutable
- Immutable, sequential data-structures such asVector
,List
,Range
,HashMap
orHashSet
scala.collection.mutable
- Mutable, sequential data-structures such asArrayBuffer
,StringBuilder
,HashMap
orHashSet
scala.collection.concurrent
- Mutable, concurrent data-structures such asTrieMap
scala.collection.parallel.immutable
- Immutable, parallel data-structures such asParVector
,ParRange
,ParHashMap
orParHashSet
scala.collection.parallel.mutable
- Mutable, parallel data-structures such asParArray
,ParHashMap
,ParTrieMap
orParHashSet
scala.concurrent
- Primitives for concurrent programming such asFutures
andPromises
scala.io
- Input and output operationsscala.math
- Basic math functions and additional numeric types likeBigInt
andBigDecimal
scala.sys
- Interaction with other processes and the operating systemscala.util.matching
- Regular expressionsOther packages exist. See the complete list on the right.
Additional parts of the standard library are shipped as separate libraries. These include:
scala.reflect
- Scala's reflection API (scala-reflect.jar)scala.xml
- XML parsing, manipulation, and serialization (scala-xml.jar)scala.swing
- A convenient wrapper around Java's GUI framework called Swing (scala-swing.jar)scala.util.parsing
- Parser combinators, including an example implementation of a JSON parser (scala-parser-combinators.jar)Automatic imports
Identifiers in the scala package and the
scala.Predef
object are always in scope by default.Some of these identifiers are type aliases provided as shortcuts to commonly used classes. For example,
List
is an alias forscala.collection.immutable.List
.Other aliases refer to classes provided by the underlying platform. For example, on the JVM,
String
is an alias forjava.lang.String
.