object Array extends java.io.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
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- Array
- Serializable
- AnyRef
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Type Members
- final class UnapplySeqWrapper[T] extends AnyVal
Value Members
- def apply(x: Unit, xs: Unit*): Array[Unit]
Creates an array of
Unit
objects - def apply(x: Double, xs: Double*): Array[Double]
Creates an array of
Double
objects - def apply(x: Float, xs: Float*): Array[Float]
Creates an array of
Float
objects - def apply(x: Long, xs: Long*): Array[Long]
Creates an array of
Long
objects - def apply(x: Int, xs: Int*): Array[Int]
Creates an array of
Int
objects - def apply(x: Char, xs: Char*): Array[Char]
Creates an array of
Char
objects - def apply(x: Short, xs: Short*): Array[Short]
Creates an array of
Short
objects - def apply(x: Byte, xs: Byte*): Array[Byte]
Creates an array of
Byte
objects - def apply(x: Boolean, xs: Boolean*): Array[Boolean]
Creates an array of
Boolean
objects - 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.
- 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
dest
array 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 copyAs[A](original: Array[_], newLength: Int)(implicit ct: ClassTag[A]): Array[A]
Copy one array to another, truncating or padding with default values (if necessary) so the copy has the specified length.
Copy one array to another, truncating or padding with default values (if necessary) so the copy has the specified length. The new array can have a different type than the original one as long as the values are assignment-compatible. When copying between primitive and object arrays, boxing and unboxing are supported.
Equivalent to Java's
java.util.Arrays.copyOf(original, newLength, newType)
, except that this works for all combinations of primitive and object arrays in a single method.- See also
java.util.Arrays#copyOf
- def copyOf[A](original: Array[A], newLength: Int): Array[A]
Copy one array to another, truncating or padding with default values (if necessary) so the copy has the specified length.
Copy one array to another, truncating or padding with default values (if necessary) so the copy has the specified length.
Equivalent to Java's
java.util.Arrays.copyOf(original, newLength)
, except that this works for primitive and object arrays in a single method.- See also
java.util.Arrays#copyOf
- 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]
- def equals(xs: Array[AnyRef], ys: Array[AnyRef]): Boolean
- 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 3rd 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 3rd 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 3rd 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
elem
is 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 from[A](it: IterableOnce[A])(implicit arg0: ClassTag[A]): Array[A]
- 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
len
values in the sequencestart, f(start), f(f(start)), ...
- def newBuilder[T](implicit t: ClassTag[T]): ArrayBuilder[T]
Returns a new scala.collection.mutable.ArrayBuilder.
- 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 - 1
up to, but excluding,end
.
- 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)
- implicit def toFactory[A](dummy: Array.type)(implicit arg0: ClassTag[A]): Factory[A, Array[A]]
Provides an implicit conversion from the Array object to a collection Factory
- def unapplySeq[T](x: Array[T]): UnapplySeqWrapper[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
x
is an Array, otherwiseNone
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
.