Array

Companion class Array

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

Linear Supertypes

java.io.Serializable, AnyRef, Any

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Type Members

final class UnapplySeqWrapper[T] extends AnyVal

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
AnyRef → Any
final def ##: Int
Equivalent to x.hashCode except for boxed numeric types and null.
Equivalent to x.hashCode except for boxed numeric types and null. 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. For null returns a hashcode where null.hashCode throws a NullPointerException.
returns
a hash value consistent with ==
Definition Classes
AnyRef → Any
final def ==(arg0: Any): Boolean
The expression x == that is equivalent to if (x eq null) that eq null else x.equals(that).
The expression x == that is equivalent to if (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
AnyRef → Any
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.
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 a ClassCastException at runtime, while the expression List(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 type T0.
def clone(): AnyRef
Create a copy of the receiver object.
Create a copy of the receiver object.
The default implementation of the clone method is platform dependent.
returns
a copy of the receiver object.
Attributes
protected[lang]
Definition Classes
AnyRef
Annotations
@throws(classOf[java.lang.CloneNotSupportedException]) @native()
Note
not specified by SLS as a member of AnyRef
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]
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 eq method implements an equivalence relation on non-null instances of AnyRef, and has three additional properties:
- It is consistent: for any non-null instances x and y of type AnyRef, multiple invocations of x.eq(y) consistently returns true or consistently returns false.
- For any non-null instance x of type AnyRef, x.eq(null) and null.eq(x) returns false.
- null.eq(null) returns true.
When overriding the equals or hashCode methods, 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
true if the argument is a reference to the receiver object; false otherwise.
Definition Classes
AnyRef
def equals(xs: Array[AnyRef], ys: Array[AnyRef]): Boolean
Compare two arrays per element.
Compare two arrays per element.
A more efficient version of xs.sameElements(ys).
Note that arrays are invariant in Scala, but it may be sound to cast an array of arbitrary reference type to Array[AnyRef]. Arrays on the JVM are covariant in their element type.
Array.equals(xs.asInstanceOf[Array[AnyRef]], ys.asInstanceOf[Array[AnyRef]])
xs
an array of AnyRef
ys
an array of AnyRef
returns
true if corresponding elements are equal
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.
Definition Classes
AnyRef → Any
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 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 finalize method is invoked, as well as the interaction between finalize and 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
def from[A](it: IterableOnce[A])(implicit arg0: ClassTag[A]): Array[A]
Build an array from the iterable collection.
Build an array from the iterable collection.
```
scala> val a = Array.from(Seq(1, 5))
val a: Array[Int] = Array(1, 5)

scala> val b = Array.from(Range(1, 5))
val b: Array[Int] = Array(1, 2, 3, 4)
```
it
the iterable collection
returns
an array consisting of elements of the iterable collection
final def getClass(): Class[_ <: AnyRef]
Returns the runtime class representation of the object.
Returns the runtime class representation of the object.
returns
a class object corresponding to the runtime type of the receiver.
Definition Classes
AnyRef → Any
Annotations
@native()
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.
Definition Classes
AnyRef → Any
Annotations
@native()
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 returns true if the value of the receiver object is a BigDecimal or a subtype of BigDecimal.
- T0 is a parameterized class type, e.g. List[Int]: this method returns true if the value of the receiver object is some List[X] for any X. For example, List(1, 2, 3).isInstanceOf[List[String]] will return true.
- T0 is some singleton type x.type or literal x: this method returns this.eq(x). For example, x.isInstanceOf[1] is equivalent to x.eq(1)
- T0 is an intersection X with Y or X & Y: this method is equivalent to x.isInstanceOf[X] && x.isInstanceOf[Y]
- T0 is a union X | Y: this method is equivalent to x.isInstanceOf[X] || x.isInstanceOf[Y]
- T0 is a type parameter or an abstract type member: this method is equivalent to isInstanceOf[U] where U is T0's upper bound, Any if T0 is unbounded. For example, x.isInstanceOf[A] where A is an unbounded type parameter will return true for any value of x.
This is exactly equivalent to the type pattern _: T0
returns
true if the receiver object is an instance of erasure of type T0; false otherwise.
Definition Classes
Any
Note
due to the unexpectedness of List(1, 2, 3).isInstanceOf[List[String]] returning true and x.isInstanceOf[A] where A is a type parameter or abstract member returning true, these forms issue a warning.
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 sequence start, f(start), f(f(start)), ...
final def ne(arg0: AnyRef): Boolean
Equivalent to !(this eq that).
Equivalent to !(this eq that).
returns
true if the argument is not a reference to the receiver object; false otherwise.
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 excluding end
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.
final def synchronized[T0](arg0: => T0): T0
Executes the code in body with an exclusive lock on this.
Executes the code in body with an exclusive lock on this.
returns
the result of body
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
An Array 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 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]): 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, otherwise None
final def wait(): Unit
See https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#wait--.
See https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#wait--.
Definition Classes
AnyRef
Annotations
@throws(classOf[java.lang.InterruptedException])
Note
not specified by SLS as a member of AnyRef
final def wait(arg0: Long, arg1: Int): Unit
See https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#wait-long-int-
See https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#wait-long-int-
Definition Classes
AnyRef
Annotations
@throws(classOf[java.lang.InterruptedException])
Note
not specified by SLS as a member of AnyRef
final def wait(arg0: Long): Unit
See https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#wait-long-.
See https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#wait-long-.
Definition Classes
AnyRef
Annotations
@throws(classOf[java.lang.InterruptedException]) @native()
Note
not specified by SLS as a member of AnyRef

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Array

Companion class Array

object Array extends java.io.Serializable

Type Members

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Inherited from java.io.Serializable

Inherited from AnyRef

Inherited from Any

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Packages

Package structure

Automatic imports

Guide

Common Imports

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Avoid Blocking

Array

Companion class Array

object Array extends java.io.Serializable

Type Members

Value Members

Inherited from java.io.Serializable

Inherited from AnyRef

Inherited from Any

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Array