object Array extends FallbackArrayBuilding with Serializable
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).
- Source
- Array.scala
- Since
1.0
- Alphabetic
- By Inheritance
- Array
- Serializable
- Serializable
- FallbackArrayBuilding
- AnyRef
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Value Members
-
final
def
!=(arg0: Any): Boolean
Test two objects for inequality.
Test two objects for inequality.
- returns
trueif !(this == that), false otherwise.
- Definition Classes
- AnyRef → Any
-
final
def
##(): Int
Equivalent to
x.hashCodeexcept for boxed numeric types andnull.Equivalent to
x.hashCodeexcept 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. Fornullreturns a hashcode wherenull.hashCodethrows aNullPointerException.- returns
a hash value consistent with ==
- Definition Classes
- AnyRef → Any
-
final
def
==(arg0: Any): Boolean
The expression
x == thatis equivalent toif (x eq null) that eq null else x.equals(that).The expression
x == thatis equivalent toif (x eq null) that eq null else x.equals(that).- returns
trueif the receiver object is equivalent to the argument;falseotherwise.
- Definition Classes
- AnyRef → Any
-
def
apply(x: Unit, xs: Unit*): Array[Unit]
Creates an array of
Unitobjects -
def
apply(x: Double, xs: Double*): Array[Double]
Creates an array of
Doubleobjects -
def
apply(x: Float, xs: Float*): Array[Float]
Creates an array of
Floatobjects -
def
apply(x: Long, xs: Long*): Array[Long]
Creates an array of
Longobjects -
def
apply(x: Int, xs: Int*): Array[Int]
Creates an array of
Intobjects -
def
apply(x: Char, xs: Char*): Array[Char]
Creates an array of
Charobjects -
def
apply(x: Short, xs: Short*): Array[Short]
Creates an array of
Shortobjects -
def
apply(x: Byte, xs: Byte*): Array[Byte]
Creates an array of
Byteobjects -
def
apply(x: Boolean, xs: Boolean*): Array[Boolean]
Creates an array of
Booleanobjects -
def
apply[T](xs: T*)(implicit arg0: ClassTag[T]): Array[T]
Creates an array with given elements.
Creates an array with given elements.
- xs
the elements to put in the array
- returns
an array containing all elements from xs.
-
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 aClassCastExceptionat 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
ClassCastExceptionif the receiver object is not an instance of the erasure of typeT0.
- implicit def canBuildFrom[T](implicit t: ClassTag[T]): CanBuildFrom[Array[_], T, Array[T]]
-
def
clone(): AnyRef
Create a copy of the receiver object.
-
def
concat[T](xss: Array[T]*)(implicit arg0: ClassTag[T]): Array[T]
Concatenates all arrays into a single array.
Concatenates all arrays into a single array.
- xss
the given arrays
- returns
the array created from concatenating
xss
-
def
copy(src: AnyRef, srcPos: Int, dest: AnyRef, destPos: Int, length: Int): Unit
Copy one array to another.
Copy one array to another. Equivalent to Java's
System.arraycopy(src, srcPos, dest, destPos, length), except that this also works for polymorphic and boxed arrays.Note that the passed-in
destarray will be modified by this call.- src
the source array.
- srcPos
starting position in the source array.
- dest
destination array.
- destPos
starting position in the destination array.
- length
the number of array elements to be copied.
- See also
java.lang.System#arraycopy
-
def
empty[T](implicit arg0: ClassTag[T]): Array[T]
Returns an array of length 0
- val emptyBooleanArray: Array[Boolean]
- val emptyByteArray: Array[Byte]
- val emptyCharArray: Array[Char]
- val emptyDoubleArray: Array[Double]
- val emptyFloatArray: Array[Float]
- val emptyIntArray: Array[Int]
- val emptyLongArray: Array[Long]
- val emptyObjectArray: Array[AnyRef]
- val emptyShortArray: Array[Short]
-
final
def
eq(arg0: AnyRef): Boolean
Tests whether the argument (
that) is a reference to the receiver object (this).Tests whether the argument (
that) is a reference to the receiver object (this).The
eqmethod implements an equivalence relation on non-null instances ofAnyRef, and has three additional properties:- It is consistent: for any non-null instances
xandyof typeAnyRef, multiple invocations ofx.eq(y)consistently returnstrueor consistently returnsfalse. - For any non-null instance
xof typeAnyRef,x.eq(null)andnull.eq(x)returnsfalse. null.eq(null)returnstrue.
When overriding the
equalsorhashCodemethods, it is important to ensure that their behavior is consistent with reference equality. Therefore, if two objects are references to each other (o1 eq o2), they should be equal to each other (o1 == o2) and they should hash to the same value (o1.hashCode == o2.hashCode).- returns
trueif the argument is a reference to the receiver object;falseotherwise.
- Definition Classes
- AnyRef
- It is consistent: for any non-null instances
-
def
equals(arg0: Any): Boolean
The equality method for reference types.
-
implicit
def
fallbackCanBuildFrom[T](implicit m: DummyImplicit): CanBuildFrom[Array[_], T, ArraySeq[T]]
A builder factory that generates a generic array.
A builder factory that generates a generic array. Called instead of
Array.newBuilderif the element type of an array does not have a class tag. Note that fallbackBuilder factory needs an implicit parameter (otherwise it would not be dominated in implicit search byArray.canBuildFrom). We make sure that implicit search is always successful.- Definition Classes
- FallbackArrayBuilding
-
def
fill[T](n1: Int, n2: Int, n3: Int, n4: Int, n5: Int)(elem: ⇒ T)(implicit arg0: ClassTag[T]): Array[Array[Array[Array[Array[T]]]]]
Returns a five-dimensional array that contains the results of some element computation a number of times.
Returns a five-dimensional array that contains the results of some element computation a number of times.
- n1
the number of elements in the 1st dimension
- n2
the number of elements in the 2nd dimension
- n3
the number of elements in the 3nd dimension
- n4
the number of elements in the 4th dimension
- n5
the number of elements in the 5th dimension
- elem
the element computation
-
def
fill[T](n1: Int, n2: Int, n3: Int, n4: Int)(elem: ⇒ T)(implicit arg0: ClassTag[T]): Array[Array[Array[Array[T]]]]
Returns a four-dimensional array that contains the results of some element computation a number of times.
Returns a four-dimensional array that contains the results of some element computation a number of times.
- n1
the number of elements in the 1st dimension
- n2
the number of elements in the 2nd dimension
- n3
the number of elements in the 3nd dimension
- n4
the number of elements in the 4th dimension
- elem
the element computation
-
def
fill[T](n1: Int, n2: Int, n3: Int)(elem: ⇒ T)(implicit arg0: ClassTag[T]): Array[Array[Array[T]]]
Returns a three-dimensional array that contains the results of some element computation a number of times.
Returns a three-dimensional array that contains the results of some element computation a number of times.
- n1
the number of elements in the 1st dimension
- n2
the number of elements in the 2nd dimension
- n3
the number of elements in the 3nd dimension
- elem
the element computation
-
def
fill[T](n1: Int, n2: Int)(elem: ⇒ T)(implicit arg0: ClassTag[T]): Array[Array[T]]
Returns a two-dimensional array that contains the results of some element computation a number of times.
Returns a two-dimensional array that contains the results of some element computation a number of times.
- n1
the number of elements in the 1st dimension
- n2
the number of elements in the 2nd dimension
- elem
the element computation
-
def
fill[T](n: Int)(elem: ⇒ T)(implicit arg0: ClassTag[T]): Array[T]
Returns an array that contains the results of some element computation a number of times.
Returns an array that contains the results of some element computation a number of times.
Note that this means that
elemis computed a total of n times:scala> Array.fill(3){ math.random } res3: Array[Double] = Array(0.365461167592537, 1.550395944913685E-4, 0.7907242137333306)
- n
the number of elements desired
- elem
the element computation
- returns
an Array of size n, where each element contains the result of computing
elem.
-
def
finalize(): Unit
Called by the garbage collector on the receiver object when there are no more references to the object.
Called by the garbage collector on the receiver object when there are no more references to the object.
The details of when and if the
finalizemethod is invoked, as well as the interaction betweenfinalizeand non-local returns and exceptions, are all platform dependent.- Attributes
- protected[lang]
- Definition Classes
- AnyRef
- Annotations
- @throws( classOf[java.lang.Throwable] )
- Note
not specified by SLS as a member of AnyRef
-
final
def
getClass(): Class[_]
Returns the runtime class representation of the object.
-
def
hashCode(): Int
The hashCode method for reference types.
-
final
def
isInstanceOf[T0]: Boolean
Test whether the dynamic type of the receiver object is
T0.Test whether the dynamic type of the receiver object is
T0.Note that the result of the test is modulo Scala's erasure semantics. Therefore the expression
1.isInstanceOf[String]will returnfalse, while the expressionList(1).isInstanceOf[List[String]]will returntrue. 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 specified type.- returns
trueif the receiver object is an instance of erasure of typeT0;falseotherwise.
- Definition Classes
- Any
-
def
iterate[T](start: T, len: Int)(f: (T) ⇒ T)(implicit arg0: ClassTag[T]): Array[T]
Returns an array containing repeated applications of a function to a start value.
Returns an array containing repeated applications of a function to a start value.
- start
the start value of the array
- len
the number of elements returned by the array
- f
the function that is repeatedly applied
- returns
the array returning
lenvalues in the sequencestart, f(start), f(f(start)), ...
-
final
def
ne(arg0: AnyRef): Boolean
Equivalent to
!(this eq that).Equivalent to
!(this eq that).- returns
trueif the argument is not a reference to the receiver object;falseotherwise.
- Definition Classes
- AnyRef
-
def
newBuilder[T](implicit t: ClassTag[T]): ArrayBuilder[T]
Returns a new scala.collection.mutable.ArrayBuilder.
-
final
def
notify(): Unit
Wakes up a single thread that is waiting on the receiver object's monitor.
Wakes up a single thread that is waiting on the receiver object's monitor.
- Definition Classes
- AnyRef
- Annotations
- @native()
- Note
not specified by SLS as a member of AnyRef
-
final
def
notifyAll(): Unit
Wakes up all threads that are waiting on the receiver object's monitor.
Wakes up all threads that are waiting on the receiver object's monitor.
- Definition Classes
- AnyRef
- Annotations
- @native()
- Note
not specified by SLS as a member of AnyRef
-
def
ofDim[T](n1: Int, n2: Int, n3: Int, n4: Int, n5: Int)(implicit arg0: ClassTag[T]): Array[Array[Array[Array[Array[T]]]]]
Creates a 5-dimensional array
-
def
ofDim[T](n1: Int, n2: Int, n3: Int, n4: Int)(implicit arg0: ClassTag[T]): Array[Array[Array[Array[T]]]]
Creates a 4-dimensional array
-
def
ofDim[T](n1: Int, n2: Int, n3: Int)(implicit arg0: ClassTag[T]): Array[Array[Array[T]]]
Creates a 3-dimensional array
-
def
ofDim[T](n1: Int, n2: Int)(implicit arg0: ClassTag[T]): Array[Array[T]]
Creates a 2-dimensional array
-
def
ofDim[T](n1: Int)(implicit arg0: ClassTag[T]): Array[T]
Creates array with given dimensions
-
def
range(start: Int, end: Int, step: Int): Array[Int]
Returns an array containing equally spaced values in some integer interval.
Returns an array containing equally spaced values in some integer interval.
- start
the start value of the array
- end
the end value of the array, exclusive (in other words, this is the first value not returned)
- step
the increment value of the array (may not be zero)
- returns
the array with values in
start, start + step, ...up to, but excludingend
-
def
range(start: Int, end: Int): Array[Int]
Returns an array containing a sequence of increasing integers in a range.
Returns an array containing a sequence of increasing integers in a range.
- start
the start value of the array
- end
the end value of the array, exclusive (in other words, this is the first value not returned)
- returns
the array with values in range
start, start + 1, ..., end - 1up to, but excluding,end.
-
final
def
synchronized[T0](arg0: ⇒ T0): T0
- Definition Classes
- AnyRef
-
def
tabulate[T](n1: Int, n2: Int, n3: Int, n4: Int, n5: Int)(f: (Int, Int, Int, Int, Int) ⇒ T)(implicit arg0: ClassTag[T]): Array[Array[Array[Array[Array[T]]]]]
Returns a five-dimensional array containing values of a given function over ranges of integer values starting from
0.Returns a five-dimensional array containing values of a given function over ranges of integer values starting from
0.- n1
the number of elements in the 1st dimension
- n2
the number of elements in the 2nd dimension
- n3
the number of elements in the 3rd dimension
- n4
the number of elements in the 4th dimension
- n5
the number of elements in the 5th dimension
- f
The function computing element values
-
def
tabulate[T](n1: Int, n2: Int, n3: Int, n4: Int)(f: (Int, Int, Int, Int) ⇒ T)(implicit arg0: ClassTag[T]): Array[Array[Array[Array[T]]]]
Returns a four-dimensional array containing values of a given function over ranges of integer values starting from
0.Returns a four-dimensional array containing values of a given function over ranges of integer values starting from
0.- n1
the number of elements in the 1st dimension
- n2
the number of elements in the 2nd dimension
- n3
the number of elements in the 3rd dimension
- n4
the number of elements in the 4th dimension
- f
The function computing element values
-
def
tabulate[T](n1: Int, n2: Int, n3: Int)(f: (Int, Int, Int) ⇒ T)(implicit arg0: ClassTag[T]): Array[Array[Array[T]]]
Returns a three-dimensional array containing values of a given function over ranges of integer values starting from
0.Returns a three-dimensional array containing values of a given function over ranges of integer values starting from
0.- n1
the number of elements in the 1st dimension
- n2
the number of elements in the 2nd dimension
- n3
the number of elements in the 3rd dimension
- f
The function computing element values
-
def
tabulate[T](n1: Int, n2: Int)(f: (Int, Int) ⇒ T)(implicit arg0: ClassTag[T]): Array[Array[T]]
Returns a two-dimensional array containing values of a given function over ranges of integer values starting from
0.Returns a two-dimensional array containing values of a given function over ranges of integer values starting from
0.- n1
the number of elements in the 1st dimension
- n2
the number of elements in the 2nd dimension
- f
The function computing element values
-
def
tabulate[T](n: Int)(f: (Int) ⇒ T)(implicit arg0: ClassTag[T]): Array[T]
Returns an array containing values of a given function over a range of integer values starting from 0.
Returns an array containing values of a given function over a range of integer values starting from 0.
- n
The number of elements in the array
- f
The function computing element values
- returns
A traversable consisting of elements
f(0),f(1), ..., f(n - 1)
-
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.
- Definition Classes
- AnyRef → Any
-
def
unapplySeq[T](x: Array[T]): Option[IndexedSeq[T]]
Called in a pattern match like
{ case Array(x,y,z) => println('3 elements')}.Called in a pattern match like
{ case Array(x,y,z) => println('3 elements')}.- x
the selector value
- returns
sequence wrapped in a scala.Some, if
xis a Seq, otherwiseNone
-
final
def
wait(): Unit
- Definition Classes
- AnyRef
- Annotations
- @throws( ... )
-
final
def
wait(arg0: Long, arg1: Int): Unit
- Definition Classes
- AnyRef
- Annotations
- @throws( ... )
- final def wait(arg0: Long): Unit
This is the documentation for the Scala standard library.
Package structure
The scala package contains core types like
Int,Float,ArrayorOptionwhich are accessible in all Scala compilation units without explicit qualification or imports.Notable packages include:
scala.collectionand its sub-packages contain Scala's collections frameworkscala.collection.immutable- Immutable, sequential data-structures such asVector,List,Range,HashMaporHashSetscala.collection.mutable- Mutable, sequential data-structures such asArrayBuffer,StringBuilder,HashMaporHashSetscala.collection.concurrent- Mutable, concurrent data-structures such asTrieMapscala.collection.parallel.immutable- Immutable, parallel data-structures such asParVector,ParRange,ParHashMaporParHashSetscala.collection.parallel.mutable- Mutable, parallel data-structures such asParArray,ParHashMap,ParTrieMaporParHashSetscala.concurrent- Primitives for concurrent programming such asFuturesandPromisesscala.io- Input and output operationsscala.math- Basic math functions and additional numeric types likeBigIntandBigDecimalscala.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 (scala-parser-combinators.jar)Automatic imports
Identifiers in the scala package and the
scala.Predefobject are always in scope by default.Some of these identifiers are type aliases provided as shortcuts to commonly used classes. For example,
Listis an alias forscala.collection.immutable.List.Other aliases refer to classes provided by the underlying platform. For example, on the JVM,
Stringis an alias forjava.lang.String.