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. 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.
- Source
- Double.scala
- Alphabetic
- By Inheritance
- Double
- AnyVal
- Any
- by double2Double
- by doubleWrapper
- by any2stringadd
- by StringFormat
- by Ensuring
- by ArrowAssoc
- Hide All
- Show All
- Public
- Protected
Abstract Value Members
- abstract def !=(x: Double): Boolean
Returns
true
if this value is not equal to x,false
otherwise. - abstract def !=(x: Float): Boolean
Returns
true
if this value is not equal to x,false
otherwise. - abstract def !=(x: Long): Boolean
Returns
true
if this value is not equal to x,false
otherwise. - abstract def !=(x: Int): Boolean
Returns
true
if this value is not equal to x,false
otherwise. - abstract def !=(x: Char): Boolean
Returns
true
if this value is not equal to x,false
otherwise. - abstract def !=(x: Short): Boolean
Returns
true
if this value is not equal to x,false
otherwise. - abstract def !=(x: Byte): Boolean
Returns
true
if this value is not equal to x,false
otherwise. - abstract def %(x: Double): Double
Returns the remainder of the division of this value by
x
. - abstract def %(x: Float): Double
Returns the remainder of the division of this value by
x
. - abstract def %(x: Long): Double
Returns the remainder of the division of this value by
x
. - abstract def %(x: Int): Double
Returns the remainder of the division of this value by
x
. - abstract def %(x: Char): Double
Returns the remainder of the division of this value by
x
. - abstract def %(x: Short): Double
Returns the remainder of the division of this value by
x
. - abstract def %(x: Byte): Double
Returns the remainder of the division of this value by
x
. - abstract def *(x: Double): Double
Returns the product of this value and
x
. - abstract def *(x: Float): Double
Returns the product of this value and
x
. - abstract def *(x: Long): Double
Returns the product of this value and
x
. - abstract def *(x: Int): Double
Returns the product of this value and
x
. - abstract def *(x: Char): Double
Returns the product of this value and
x
. - abstract def *(x: Short): Double
Returns the product of this value and
x
. - abstract def *(x: Byte): Double
Returns the product of this value and
x
. - abstract def +(x: Double): Double
Returns the sum of this value and
x
. - abstract def +(x: Float): Double
Returns the sum of this value and
x
. - abstract def +(x: Long): Double
Returns the sum of this value and
x
. - abstract def +(x: Int): Double
Returns the sum of this value and
x
. - abstract def +(x: Char): Double
Returns the sum of this value and
x
. - abstract def +(x: Short): Double
Returns the sum of this value and
x
. - abstract def +(x: Byte): Double
Returns the sum of this value and
x
. - abstract def -(x: Double): Double
Returns the difference of this value and
x
. - abstract def -(x: Float): Double
Returns the difference of this value and
x
. - abstract def -(x: Long): Double
Returns the difference of this value and
x
. - abstract def -(x: Int): Double
Returns the difference of this value and
x
. - abstract def -(x: Char): Double
Returns the difference of this value and
x
. - abstract def -(x: Short): Double
Returns the difference of this value and
x
. - abstract def -(x: Byte): Double
Returns the difference of this value and
x
. - abstract def /(x: Double): Double
Returns the quotient of this value and
x
. - abstract def /(x: Float): Double
Returns the quotient of this value and
x
. - abstract def /(x: Long): Double
Returns the quotient of this value and
x
. - abstract def /(x: Int): Double
Returns the quotient of this value and
x
. - abstract def /(x: Char): Double
Returns the quotient of this value and
x
. - abstract def /(x: Short): Double
Returns the quotient of this value and
x
. - abstract def /(x: Byte): Double
Returns the quotient of this value and
x
. - abstract def <(x: Double): Boolean
Returns
true
if this value is less than x,false
otherwise. - abstract def <(x: Float): Boolean
Returns
true
if this value is less than x,false
otherwise. - abstract def <(x: Long): Boolean
Returns
true
if this value is less than x,false
otherwise. - abstract def <(x: Int): Boolean
Returns
true
if this value is less than x,false
otherwise. - abstract def <(x: Char): Boolean
Returns
true
if this value is less than x,false
otherwise. - abstract def <(x: Short): Boolean
Returns
true
if this value is less than x,false
otherwise. - abstract def <(x: Byte): Boolean
Returns
true
if this value is less than x,false
otherwise. - abstract def <=(x: Double): Boolean
Returns
true
if this value is less than or equal to x,false
otherwise. - abstract def <=(x: Float): Boolean
Returns
true
if this value is less than or equal to x,false
otherwise. - abstract def <=(x: Long): Boolean
Returns
true
if this value is less than or equal to x,false
otherwise. - abstract def <=(x: Int): Boolean
Returns
true
if this value is less than or equal to x,false
otherwise. - abstract def <=(x: Char): Boolean
Returns
true
if this value is less than or equal to x,false
otherwise. - abstract def <=(x: Short): Boolean
Returns
true
if this value is less than or equal to x,false
otherwise. - abstract def <=(x: Byte): Boolean
Returns
true
if this value is less than or equal to x,false
otherwise. - abstract def ==(x: Double): Boolean
Returns
true
if this value is equal to x,false
otherwise. - abstract def ==(x: Float): Boolean
Returns
true
if this value is equal to x,false
otherwise. - abstract def ==(x: Long): Boolean
Returns
true
if this value is equal to x,false
otherwise. - abstract def ==(x: Int): Boolean
Returns
true
if this value is equal to x,false
otherwise. - abstract def ==(x: Char): Boolean
Returns
true
if this value is equal to x,false
otherwise. - abstract def ==(x: Short): Boolean
Returns
true
if this value is equal to x,false
otherwise. - abstract def ==(x: Byte): Boolean
Returns
true
if this value is equal to x,false
otherwise. - abstract def >(x: Double): Boolean
Returns
true
if this value is greater than x,false
otherwise. - abstract def >(x: Float): Boolean
Returns
true
if this value is greater than x,false
otherwise. - abstract def >(x: Long): Boolean
Returns
true
if this value is greater than x,false
otherwise. - abstract def >(x: Int): Boolean
Returns
true
if this value is greater than x,false
otherwise. - abstract def >(x: Char): Boolean
Returns
true
if this value is greater than x,false
otherwise. - abstract def >(x: Short): Boolean
Returns
true
if this value is greater than x,false
otherwise. - abstract def >(x: Byte): Boolean
Returns
true
if this value is greater than x,false
otherwise. - abstract def >=(x: Double): Boolean
Returns
true
if this value is greater than or equal to x,false
otherwise. - abstract def >=(x: Float): Boolean
Returns
true
if this value is greater than or equal to x,false
otherwise. - abstract def >=(x: Long): Boolean
Returns
true
if this value is greater than or equal to x,false
otherwise. - abstract def >=(x: Int): Boolean
Returns
true
if this value is greater than or equal to x,false
otherwise. - abstract def >=(x: Char): Boolean
Returns
true
if this value is greater than or equal to x,false
otherwise. - abstract def >=(x: Short): Boolean
Returns
true
if this value is greater than or equal to x,false
otherwise. - abstract def >=(x: Byte): Boolean
Returns
true
if this value is greater than or equal to x,false
otherwise. - abstract def toByte: Byte
- abstract def toChar: Char
- abstract def toDouble: Double
- abstract def toFloat: Float
- abstract def toInt: Int
- abstract def toLong: Long
- abstract def toShort: Short
- abstract def unary_+: Double
Returns this value, unmodified.
- abstract def unary_-: Double
Returns the negation of this value.
- abstract def +(x: String): String
- Annotations
- @deprecated
- Deprecated
(Since version 2.13.0) Adding a number and a String is deprecated. Use the string interpolation
s"$num$str"
Concrete Value Members
- final def !=(arg0: Any): Boolean
Test two objects for inequality.
Test two objects for inequality.
- returns
true
if !(this == that), false otherwise.
- Definition Classes
- Any
- final def ##: Int
Equivalent to
x.hashCode
except for boxed numeric types andnull
.Equivalent to
x.hashCode
except for boxed numeric types andnull
. For numerics, it returns a hash value which is consistent with value equality: if two value type instances compare as true, then ## will produce the same hash value for each of them. Fornull
returns a hashcode wherenull.hashCode
throws aNullPointerException
.- returns
a hash value consistent with ==
- Definition Classes
- Any
- def ->[B](y: B): (Double, B)
- Implicit
- This member is added by an implicit conversion from Double toArrowAssoc[Double] performed by method ArrowAssoc in scala.Predef.
- Definition Classes
- ArrowAssoc
- Annotations
- @inline()
- final def ==(arg0: Any): Boolean
Test two objects for equality.
Test two objects for equality. The expression
x == that
is equivalent toif (x eq null) that eq null else x.equals(that)
.- returns
true
if the receiver object is equivalent to the argument;false
otherwise.
- Definition Classes
- Any
- def abs: Double
- Implicit
- This member is added by an implicit conversion from Double toRichDouble performed by method doubleWrapper in scala.LowPriorityImplicits.
- Definition Classes
- RichDouble → ScalaNumberProxy
- final def asInstanceOf[T0]: T0
Cast the receiver object to be of type
T0
.Cast the receiver object to be of type
T0
.Note that the success of a cast at runtime is modulo Scala's erasure semantics. Therefore the expression
1.asInstanceOf[String]
will throw aClassCastException
at runtime, while the expressionList(1).asInstanceOf[List[String]]
will not. In the latter example, because the type argument is erased as part of compilation it is not possible to check whether the contents of the list are of the requested type.- returns
the receiver object.
- Definition Classes
- Any
- Exceptions thrown
ClassCastException
if the receiver object is not an instance of the erasure of typeT0
.
- def byteValue(): Byte
- Implicit
- This member is added by an implicit conversion from Double tojava.lang.Double performed by method double2Double in scala.Predef.
- Definition Classes
- Double → Number
- def byteValue: Byte
- Implicit
- This member is added by an implicit conversion from Double toRichDouble performed by method doubleWrapper in scala.LowPriorityImplicits.
- Definition Classes
- RichDouble → ScalaNumberProxy → ScalaNumericAnyConversions
- def ceil: Double
- Implicit
- This member is added by an implicit conversion from Double toRichDouble performed by method doubleWrapper in scala.LowPriorityImplicits.
- Definition Classes
- RichDouble
- def compare(y: Double): Int
Result of comparing
this
with operandthat
.Result of comparing
this
with operandthat
.Implement this method to determine how instances of A will be sorted.
Returns
x
where:x < 0
whenthis < that
x == 0
whenthis == that
x > 0
whenthis > that
- def compareTo(arg0: java.lang.Double): Int
- Implicit
- This member is added by an implicit conversion from Double tojava.lang.Double performed by method double2Double in scala.Predef.
- Definition Classes
- Double → Comparable
- def compareTo(that: Double): Int
Result of comparing
this
with operandthat
. - def doubleValue(): Double
- Implicit
- This member is added by an implicit conversion from Double tojava.lang.Double performed by method double2Double in scala.Predef.
- Definition Classes
- Double → Number
- def doubleValue: Double
- Implicit
- This member is added by an implicit conversion from Double toRichDouble performed by method doubleWrapper in scala.LowPriorityImplicits.
- Definition Classes
- RichDouble → ScalaNumberProxy → ScalaNumericAnyConversions
- def ensuring(cond: (Double) => Boolean, msg: => Any): Double
- Implicit
- This member is added by an implicit conversion from Double toEnsuring[Double] performed by method Ensuring in scala.Predef.
- Definition Classes
- Ensuring
- def ensuring(cond: (Double) => Boolean): Double
- Implicit
- This member is added by an implicit conversion from Double toEnsuring[Double] performed by method Ensuring in scala.Predef.
- Definition Classes
- Ensuring
- def ensuring(cond: Boolean, msg: => Any): Double
- Implicit
- This member is added by an implicit conversion from Double toEnsuring[Double] performed by method Ensuring in scala.Predef.
- Definition Classes
- Ensuring
- def ensuring(cond: Boolean): Double
- Implicit
- This member is added by an implicit conversion from Double toEnsuring[Double] performed by method Ensuring in scala.Predef.
- Definition Classes
- Ensuring
- def equals(arg0: Any): Boolean
Compares the receiver object (
this
) with the argument object (that
) for equivalence.Compares the receiver object (
this
) with the argument object (that
) for equivalence.Any implementation of this method should be an equivalence relation:
- It is reflexive: for any instance
x
of typeAny
,x.equals(x)
should returntrue
. - It is symmetric: for any instances
x
andy
of typeAny
,x.equals(y)
should returntrue
if and only ify.equals(x)
returnstrue
. - It is transitive: for any instances
x
,y
, andz
of typeAny
ifx.equals(y)
returnstrue
andy.equals(z)
returnstrue
, thenx.equals(z)
should returntrue
.
If you override this method, you should verify that your implementation remains an equivalence relation. Additionally, when overriding this method it is usually necessary to override
hashCode
to ensure that objects which are "equal" (o1.equals(o2)
returnstrue
) hash to the same scala.Int. (o1.hashCode.equals(o2.hashCode)
).- returns
true
if the receiver object is equivalent to the argument;false
otherwise.
- Definition Classes
- Any
- It is reflexive: for any instance
- def floatValue(): Float
- Implicit
- This member is added by an implicit conversion from Double tojava.lang.Double performed by method double2Double in scala.Predef.
- Definition Classes
- Double → Number
- def floatValue: Float
- Implicit
- This member is added by an implicit conversion from Double toRichDouble performed by method doubleWrapper in scala.LowPriorityImplicits.
- Definition Classes
- RichDouble → ScalaNumberProxy → ScalaNumericAnyConversions
- def floor: Double
- Implicit
- This member is added by an implicit conversion from Double toRichDouble performed by method doubleWrapper in scala.LowPriorityImplicits.
- Definition Classes
- RichDouble
- def getClass(): Class[Double]
Returns the runtime class representation of the object.
- def hashCode(): Int
Calculate a hash code value for the object.
Calculate a hash code value for the object.
The default hashing algorithm is platform dependent.
Note that it is allowed for two objects to have identical hash codes (
o1.hashCode.equals(o2.hashCode)
) yet not be equal (o1.equals(o2)
returnsfalse
). A degenerate implementation could always return0
. However, it is required that if two objects are equal (o1.equals(o2)
returnstrue
) that they have identical hash codes (o1.hashCode.equals(o2.hashCode)
). Therefore, when overriding this method, be sure to verify that the behavior is consistent with theequals
method.- returns
the hash code value for this object.
- Definition Classes
- Any
- def intValue(): Int
- Implicit
- This member is added by an implicit conversion from Double tojava.lang.Double performed by method double2Double in scala.Predef.
- Definition Classes
- Double → Number
- def intValue: Int
- Implicit
- This member is added by an implicit conversion from Double toRichDouble performed by method doubleWrapper in scala.LowPriorityImplicits.
- Definition Classes
- RichDouble → ScalaNumberProxy → ScalaNumericAnyConversions
- def isFinite: Boolean
- Implicit
- This member is added by an implicit conversion from Double toRichDouble performed by method doubleWrapper in scala.LowPriorityImplicits.
- Definition Classes
- RichDouble
- def isInfinite(): Boolean
- Implicit
- This member is added by an implicit conversion from Double tojava.lang.Double performed by method double2Double in scala.Predef.
- Definition Classes
- Double
- def isInfinity: Boolean
- Implicit
- This member is added by an implicit conversion from Double toRichDouble performed by method doubleWrapper in scala.LowPriorityImplicits.
- Definition Classes
- RichDouble
- final def isInstanceOf[T0]: Boolean
Test whether the dynamic type of the receiver object has the same erasure as
T0
.Test whether the dynamic type of the receiver object has the same erasure as
T0
.Depending on what
T0
is, the test is done in one of the below ways:T0
is a non-parameterized class type, e.g.BigDecimal
: this method returnstrue
if the value of the receiver object is aBigDecimal
or a subtype ofBigDecimal
.T0
is a parameterized class type, e.g.List[Int]
: this method returnstrue
if the value of the receiver object is someList[X]
for anyX
. For example,List(1, 2, 3).isInstanceOf[List[String]]
will return true.T0
is some singleton typex.type
or literalx
: this method returnsthis.eq(x)
. For example,x.isInstanceOf[1]
is equivalent tox.eq(1)
T0
is an intersectionX with Y
orX & Y: this method is equivalent to
x.isInstanceOf[X] && x.isInstanceOf[Y]T0
is a unionX | Y
: this method is equivalent tox.isInstanceOf[X] || x.isInstanceOf[Y]
T0
is a type parameter or an abstract type member: this method is equivalent toisInstanceOf[U]
whereU
isT0
's upper bound,Any
ifT0
is unbounded. For example,x.isInstanceOf[A]
whereA
is an unbounded type parameter will return true for any value ofx
.
This is exactly equivalent to the type pattern
_: T0
- returns
true
if the receiver object is an instance of erasure of typeT0
;false
otherwise.
- Definition Classes
- Any
- Note
due to the unexpectedness of
List(1, 2, 3).isInstanceOf[List[String]]
returning true andx.isInstanceOf[A]
whereA
is a type parameter or abstract member returning true, these forms issue a warning.
- def isNaN(): Boolean
- Implicit
- This member is added by an implicit conversion from Double tojava.lang.Double performed by method double2Double in scala.Predef.
- Definition Classes
- Double
- def isNaN: Boolean
- Implicit
- This member is added by an implicit conversion from Double toRichDouble performed by method doubleWrapper in scala.LowPriorityImplicits.
- Definition Classes
- RichDouble
- def isNegInfinity: Boolean
- Implicit
- This member is added by an implicit conversion from Double toRichDouble performed by method doubleWrapper in scala.LowPriorityImplicits.
- Definition Classes
- RichDouble
- def isPosInfinity: Boolean
- Implicit
- This member is added by an implicit conversion from Double toRichDouble performed by method doubleWrapper in scala.LowPriorityImplicits.
- Definition Classes
- RichDouble
- def isValidByte: Boolean
Returns
true
iff this has a zero fractional part, and is within the range of scala.Byte MinValue and MaxValue; otherwise returnsfalse
.Returns
true
iff this has a zero fractional part, and is within the range of scala.Byte MinValue and MaxValue; otherwise returnsfalse
.- Implicit
- This member is added by an implicit conversion from Double toRichDouble performed by method doubleWrapper in scala.LowPriorityImplicits.
- Definition Classes
- RichDouble → ScalaNumericAnyConversions
- def isValidChar: Boolean
Returns
true
iff this has a zero fractional part, and is within the range of scala.Char MinValue and MaxValue; otherwise returnsfalse
.Returns
true
iff this has a zero fractional part, and is within the range of scala.Char MinValue and MaxValue; otherwise returnsfalse
.- Implicit
- This member is added by an implicit conversion from Double toRichDouble performed by method doubleWrapper in scala.LowPriorityImplicits.
- Definition Classes
- RichDouble → ScalaNumericAnyConversions
- def isValidInt: Boolean
Returns
true
iff this has a zero fractional part, and is within the range of scala.Int MinValue and MaxValue; otherwise returnsfalse
.Returns
true
iff this has a zero fractional part, and is within the range of scala.Int MinValue and MaxValue; otherwise returnsfalse
.- Implicit
- This member is added by an implicit conversion from Double toRichDouble performed by method doubleWrapper in scala.LowPriorityImplicits.
- Definition Classes
- RichDouble → ScalaNumericAnyConversions
- def isValidShort: Boolean
Returns
true
iff this has a zero fractional part, and is within the range of scala.Short MinValue and MaxValue; otherwise returnsfalse
.Returns
true
iff this has a zero fractional part, and is within the range of scala.Short MinValue and MaxValue; otherwise returnsfalse
.- Implicit
- This member is added by an implicit conversion from Double toRichDouble performed by method doubleWrapper in scala.LowPriorityImplicits.
- Definition Classes
- RichDouble → ScalaNumericAnyConversions
- def isWhole: Boolean
- returns
true
if this number has no decimal component,false
otherwise.
- Implicit
- This member is added by an implicit conversion from Double toRichDouble performed by method doubleWrapper in scala.LowPriorityImplicits.
- Definition Classes
- RichDouble → FractionalProxy → ScalaNumericAnyConversions
- def longValue(): Long
- Implicit
- This member is added by an implicit conversion from Double tojava.lang.Double performed by method double2Double in scala.Predef.
- Definition Classes
- Double → Number
- def longValue: Long
- Implicit
- This member is added by an implicit conversion from Double toRichDouble performed by method doubleWrapper in scala.LowPriorityImplicits.
- Definition Classes
- RichDouble → ScalaNumberProxy → ScalaNumericAnyConversions
- def max(that: Double): Double
- Implicit
- This member is added by an implicit conversion from Double toRichDouble performed by method doubleWrapper in scala.LowPriorityImplicits.
- Definition Classes
- RichDouble → ScalaNumberProxy
- def min(that: Double): Double
- Implicit
- This member is added by an implicit conversion from Double toRichDouble performed by method doubleWrapper in scala.LowPriorityImplicits.
- Definition Classes
- RichDouble → ScalaNumberProxy
- def round: Long
- Implicit
- This member is added by an implicit conversion from Double toRichDouble performed by method doubleWrapper in scala.LowPriorityImplicits.
- Definition Classes
- RichDouble
- val self: Double
- def shortValue(): Short
- Implicit
- This member is added by an implicit conversion from Double tojava.lang.Double performed by method double2Double in scala.Predef.
- Definition Classes
- Double → Number
- def shortValue: Short
- Implicit
- This member is added by an implicit conversion from Double toRichDouble performed by method doubleWrapper in scala.LowPriorityImplicits.
- Definition Classes
- RichDouble → ScalaNumberProxy → ScalaNumericAnyConversions
- def sign: Double
- Implicit
- This member is added by an implicit conversion from Double toRichDouble performed by method doubleWrapper in scala.LowPriorityImplicits.
- Definition Classes
- ScalaNumberProxy
- def toDegrees: Double
- Implicit
- This member is added by an implicit conversion from Double toRichDouble performed by method doubleWrapper in scala.LowPriorityImplicits.
- Definition Classes
- RichDouble
- def toRadians: Double
- Implicit
- This member is added by an implicit conversion from Double toRichDouble performed by method doubleWrapper in scala.LowPriorityImplicits.
- Definition Classes
- RichDouble
- def toString(): String
Returns a string representation of the object.
Returns a string representation of the object.
The default representation is platform dependent.
- returns
a string representation of the object.
- Definition Classes
- Any
Shadowed Implicit Value Members
- def +(other: String): String
- Implicit
- This member is added by an implicit conversion from Double toany2stringadd[Double] performed by method any2stringadd in scala.Predef.
- Shadowing
- This implicitly inherited member is shadowed by one or more members in this class.
To access this member you can use a type ascription:(double: any2stringadd[Double]).+(other)
- Definition Classes
- any2stringadd
- def <(that: Double): Boolean
Returns true if
this
is less thanthat
Returns true if
this
is less thanthat
- Implicit
- This member is added by an implicit conversion from Double toRichDouble performed by method doubleWrapper in scala.LowPriorityImplicits.
- Shadowing
- This implicitly inherited member is shadowed by one or more members in this class.
To access this member you can use a type ascription:(double: RichDouble).<(that)
- Definition Classes
- Ordered
- def <=(that: Double): Boolean
Returns true if
this
is less than or equal tothat
.Returns true if
this
is less than or equal tothat
.- Implicit
- This member is added by an implicit conversion from Double toRichDouble performed by method doubleWrapper in scala.LowPriorityImplicits.
- Shadowing
- This implicitly inherited member is shadowed by one or more members in this class.
To access this member you can use a type ascription:(double: RichDouble).<=(that)
- Definition Classes
- Ordered
- def >(that: Double): Boolean
Returns true if
this
is greater thanthat
.Returns true if
this
is greater thanthat
.- Implicit
- This member is added by an implicit conversion from Double toRichDouble performed by method doubleWrapper in scala.LowPriorityImplicits.
- Shadowing
- This implicitly inherited member is shadowed by one or more members in this class.
To access this member you can use a type ascription:(double: RichDouble).>(that)
- Definition Classes
- Ordered
- def >=(that: Double): Boolean
Returns true if
this
is greater than or equal tothat
.Returns true if
this
is greater than or equal tothat
.- Implicit
- This member is added by an implicit conversion from Double toRichDouble performed by method doubleWrapper in scala.LowPriorityImplicits.
- Shadowing
- This implicitly inherited member is shadowed by one or more members in this class.
To access this member you can use a type ascription:(double: RichDouble).>=(that)
- Definition Classes
- Ordered
- def equals(arg0: AnyRef): Boolean
The equality method for reference types.
The equality method for reference types. Default implementation delegates to
eq
.See also
equals
in scala.Any.- returns
true
if the receiver object is equivalent to the argument;false
otherwise.
- Implicit
- This member is added by an implicit conversion from Double tojava.lang.Double performed by method double2Double in scala.Predef.
- Shadowing
- This implicitly inherited member is shadowed by one or more members in this class.
To access this member you can use a type ascription:(double: java.lang.Double).equals(arg0)
- Definition Classes
- Double → AnyRef → Any
- def hashCode(): Int
The hashCode method for reference types.
The hashCode method for reference types. See hashCode in scala.Any.
- returns
the hash code value for this object.
- Implicit
- This member is added by an implicit conversion from Double tojava.lang.Double performed by method double2Double in scala.Predef.
- Shadowing
- This implicitly inherited member is shadowed by one or more members in this class.
To access this member you can use a type ascription:(double: java.lang.Double).hashCode()
- Definition Classes
- Double → AnyRef → Any
- def toByte: Byte
Returns the value of this as a scala.Byte.
Returns the value of this as a scala.Byte. This may involve rounding or truncation.
- Implicit
- This member is added by an implicit conversion from Double toRichDouble performed by method doubleWrapper in scala.LowPriorityImplicits.
- Shadowing
- This implicitly inherited member is shadowed by one or more members in this class.
To access this member you can use a type ascription:(double: RichDouble).toByte
- Definition Classes
- ScalaNumericAnyConversions
- def toChar: Char
Returns the value of this as a scala.Char.
Returns the value of this as a scala.Char. This may involve rounding or truncation.
- Implicit
- This member is added by an implicit conversion from Double toRichDouble performed by method doubleWrapper in scala.LowPriorityImplicits.
- Shadowing
- This implicitly inherited member is shadowed by one or more members in this class.
To access this member you can use a type ascription:(double: RichDouble).toChar
- Definition Classes
- ScalaNumericAnyConversions
- def toDouble: Double
Returns the value of this as a scala.Double.
Returns the value of this as a scala.Double. This may involve rounding or truncation.
- Implicit
- This member is added by an implicit conversion from Double toRichDouble performed by method doubleWrapper in scala.LowPriorityImplicits.
- Shadowing
- This implicitly inherited member is shadowed by one or more members in this class.
To access this member you can use a type ascription:(double: RichDouble).toDouble
- Definition Classes
- ScalaNumericAnyConversions
- def toFloat: Float
Returns the value of this as a scala.Float.
Returns the value of this as a scala.Float. This may involve rounding or truncation.
- Implicit
- This member is added by an implicit conversion from Double toRichDouble performed by method doubleWrapper in scala.LowPriorityImplicits.
- Shadowing
- This implicitly inherited member is shadowed by one or more members in this class.
To access this member you can use a type ascription:(double: RichDouble).toFloat
- Definition Classes
- ScalaNumericAnyConversions
- def toInt: Int
Returns the value of this as an scala.Int.
Returns the value of this as an scala.Int. This may involve rounding or truncation.
- Implicit
- This member is added by an implicit conversion from Double toRichDouble performed by method doubleWrapper in scala.LowPriorityImplicits.
- Shadowing
- This implicitly inherited member is shadowed by one or more members in this class.
To access this member you can use a type ascription:(double: RichDouble).toInt
- Definition Classes
- ScalaNumericAnyConversions
- def toLong: Long
Returns the value of this as a scala.Long.
Returns the value of this as a scala.Long. This may involve rounding or truncation.
- Implicit
- This member is added by an implicit conversion from Double toRichDouble performed by method doubleWrapper in scala.LowPriorityImplicits.
- Shadowing
- This implicitly inherited member is shadowed by one or more members in this class.
To access this member you can use a type ascription:(double: RichDouble).toLong
- Definition Classes
- ScalaNumericAnyConversions
- def toShort: Short
Returns the value of this as a scala.Short.
Returns the value of this as a scala.Short. This may involve rounding or truncation.
- Implicit
- This member is added by an implicit conversion from Double toRichDouble performed by method doubleWrapper in scala.LowPriorityImplicits.
- Shadowing
- This implicitly inherited member is shadowed by one or more members in this class.
To access this member you can use a type ascription:(double: RichDouble).toShort
- Definition Classes
- ScalaNumericAnyConversions
- def toString(): String
Creates a String representation of this object.
Creates a String representation of this object. The default representation is platform dependent. On the java platform it is the concatenation of the class name, "@", and the object's hashcode in hexadecimal.
- returns
a String representation of the object.
- Implicit
- This member is added by an implicit conversion from Double tojava.lang.Double performed by method double2Double in scala.Predef.
- Shadowing
- This implicitly inherited member is shadowed by one or more members in this class.
To access this member you can use a type ascription:(double: java.lang.Double).toString()
- Definition Classes
- Double → AnyRef → Any
- def toString(): String
Returns a string representation of the object.
Returns a string representation of the object.
The default representation is platform dependent.
- returns
a string representation of the object.
- Implicit
- This member is added by an implicit conversion from Double toRichDouble performed by method doubleWrapper in scala.LowPriorityImplicits.
- Shadowing
- This implicitly inherited member is shadowed by one or more members in this class.
To access this member you can use a type ascription:(double: RichDouble).toString()
- Definition Classes
- Proxy → Any
Deprecated Value Members
- def formatted(fmtstr: String): String
Returns string formatted according to given
format
string.Returns string formatted according to given
format
string. Format strings are as forString.format
(@see java.lang.String.format).- Implicit
- This member is added by an implicit conversion from Double toStringFormat[Double] performed by method StringFormat in scala.Predef.
- Definition Classes
- StringFormat
- Annotations
- @deprecated @inline()
- Deprecated
(Since version 2.12.16) Use
formatString.format(value)
instead ofvalue.formatted(formatString)
, or use thef""
string interpolator. In Java 15 and later,formatted
resolves to the new method in String which has reversed parameters.
- def signum: Int
- Implicit
- This member is added by an implicit conversion from Double toRichDouble performed by method doubleWrapper in scala.LowPriorityImplicits.
- Definition Classes
- RichDouble → ScalaNumberProxy
- Annotations
- @deprecated
- Deprecated
(Since version 2.13.0) signum does not handle -0.0 or Double.NaN; use
sign
method instead
- def →[B](y: B): (Double, B)
- Implicit
- This member is added by an implicit conversion from Double toArrowAssoc[Double] performed by method ArrowAssoc in scala.Predef.
- Definition Classes
- ArrowAssoc
- Annotations
- @deprecated
- Deprecated
(Since version 2.13.0) Use
->
instead. If you still wish to display it as one character, consider using a font with programming ligatures such as Fira Code.
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.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.collection.parallel
- Parallel collections (scala-parallel-collections.jar)scala.util.parsing
- Parser combinators (scala-parser-combinators.jar)scala.swing
- A convenient wrapper around Java's GUI framework called Swing (scala-swing.jar)Automatic imports
Identifiers in the scala package and the
scala.Predef
object are always in scope by default.Some of these identifiers are type aliases provided as shortcuts to commonly used classes. For example,
List
is an alias 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
.