Array

Companion object Array

final class Array[T] extends java.io.Serializable with java.lang.Cloneable

Arrays are mutable, indexed collections of values. Array[T] is Scala's representation for Java's T[].

val numbers = Array(1, 2, 3, 4)
val first = numbers(0) // read the first element
numbers(3) = 100 // replace the 4th array element with 100
val biggerNumbers = numbers.map(_ * 2) // multiply all numbers by two

Arrays make use of two common pieces of Scala syntactic sugar, shown on lines 2 and 3 of the above example code. Line 2 is translated into a call to apply(Int), while line 3 is translated into a call to update(Int, T).

Two implicit conversions exist in scala.Predef that are frequently applied to arrays: a conversion to scala.collection.mutable.ArrayOps (shown on line 4 of the example above) and a conversion to scala.collection.mutable.WrappedArray (a subtype of scala.collection.Seq). Both types make available many of the standard operations found in the Scala collections API. The conversion to ArrayOps is temporary, as all operations defined on ArrayOps return an Array, while the conversion to WrappedArray is permanent as all operations return a WrappedArray.

The conversion to ArrayOps takes priority over the conversion to WrappedArray. For instance, consider the following code:

val arr = Array(1, 2, 3)
val arrReversed = arr.reverse
val seqReversed : Seq[Int] = arr.reverse

Value arrReversed will be of type Array[Int], with an implicit conversion to ArrayOps occurring to perform the reverse operation. The value of seqReversed, on the other hand, will be computed by converting to WrappedArray first and invoking the variant of reverse that returns another WrappedArray.

Source: Array.scala
Since: 1.0
See also: Scala Language Specification, for in-depth information on the transformations the Scala compiler makes on Arrays (Sections 6.6 and 6.15 respectively.)
"Scala 2.8 Arrays" the Scala Improvement Document detailing arrays since Scala 2.8.
"The Scala 2.8 Collections' API" section on Array by Martin Odersky for more information.

Linear Supertypes

java.lang.Cloneable, java.io.Serializable, AnyRef, Any

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Inherited

Array
Cloneable
Serializable
AnyRef
Any

Implicitly

by genericArrayOps
by any2stringadd
by StringFormat
by Ensuring
by ArrowAssoc

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Visibility

Public
All

Instance Constructors

new Array(_length: Int)

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
def +(other: String): String

Implicit
This member is added by an implicit conversion from Array[T] to any2stringadd[Array[T]] performed by method any2stringadd in scala.Predef.
Definition Classes
any2stringadd
def ++[B >: A, That](that: GenTraversableOnce[B])(implicit bf: CanBuildFrom[Array[T], B, That]): That
Returns a new mutable indexed sequence containing the elements from the left hand operand followed by the elements from the right hand operand.
Returns a new mutable indexed sequence containing the elements from the left hand operand followed by the elements from the right hand operand. The element type of the mutable indexed sequence is the most specific superclass encompassing the element types of the two operands.
B
the element type of the returned collection.
That
the class of the returned collection. Where possible, That is the same class as the current collection class Repr, but this depends on the element type B being admissible for that class, which means that an implicit instance of type CanBuildFrom[Repr, B, That] is found.
that
the traversable to append.
bf
an implicit value of class CanBuildFrom which determines the result class That from the current representation type Repr and the new element type B.
returns
a new collection of type That which contains all elements of this mutable indexed sequence followed by all elements of that.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
TraversableLike → GenTraversableLike
def ++:[B >: A, That](that: collection.Traversable[B])(implicit bf: CanBuildFrom[Array[T], B, That]): That
As with ++, returns a new collection containing the elements from the left operand followed by the elements from the right operand.
As with ++, returns a new collection containing the elements from the left operand followed by the elements from the right operand.
It differs from ++ in that the right operand determines the type of the resulting collection rather than the left one. Mnemonic: the COLon is on the side of the new COLlection type.
Example:
```
scala> val x = List(1)
x: List[Int] = List(1)

scala> val y = LinkedList(2)
y: scala.collection.mutable.LinkedList[Int] = LinkedList(2)

scala> val z = x ++: y
z: scala.collection.mutable.LinkedList[Int] = LinkedList(1, 2)
```
This overload exists because: for the implementation of ++: we should reuse that of ++ because many collections override it with more efficient versions.
Since TraversableOnce has no ++ method, we have to implement that directly, but Traversable and down can use the overload.
B
the element type of the returned collection.
That
the class of the returned collection. Where possible, That is the same class as the current collection class Repr, but this depends on the element type B being admissible for that class, which means that an implicit instance of type CanBuildFrom[Repr, B, That] is found.
that
the traversable to append.
bf
an implicit value of class CanBuildFrom which determines the result class That from the current representation type Repr and the new element type B.
returns
a new collection of type That which contains all elements of this mutable indexed sequence followed by all elements of that.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
TraversableLike
def ++:[B](that: collection.TraversableOnce[B]): Array[B]
[use case] As with ++, returns a new collection containing the elements from the left operand followed by the elements from the right operand.
[use case]
As with ++, returns a new collection containing the elements from the left operand followed by the elements from the right operand.
It differs from ++ in that the right operand determines the type of the resulting collection rather than the left one. Mnemonic: the COLon is on the side of the new COLlection type.
Example:
```
scala> val x = List(1)
x: List[Int] = List(1)

scala> val y = LinkedList(2)
y: scala.collection.mutable.LinkedList[Int] = LinkedList(2)

scala> val z = x ++: y
z: scala.collection.mutable.LinkedList[Int] = LinkedList(1, 2)
```
B
the element type of the returned collection.
that
the traversable to append.
returns
a new array which contains all elements of this array followed by all elements of that.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
TraversableLike
Full Signature
def ++:[B >: A, That](that: collection.TraversableOnce[B])(implicit bf: CanBuildFrom[Array[T], B, That]): That
def +:[B >: T](elem: B)(implicit arg0: ClassTag[B]): Array[B]

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
ArrayOps
def +:(elem: A): Array[A]
[use case] A copy of the array with an element prepended.
[use case]
A copy of the array with an element prepended.
Note that :-ending operators are right associative (see example). A mnemonic for +: vs. :+ is: the COLon goes on the COLlection side.
Also, the original array is not modified, so you will want to capture the result.
Example:
```
scala> val x = List(1)
x: List[Int] = List(1)

scala> val y = 2 +: x
y: List[Int] = List(2, 1)

scala> println(x)
List(1)
```
elem
the prepended element
returns
a new array consisting of elem followed by all elements of this array.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
SeqLike → GenSeqLike
Full Signature
def +:[B >: A, That](elem: B)(implicit bf: CanBuildFrom[Array[T], B, That]): That
def ->[B](y: B): (Array[T], B)

Implicit
This member is added by an implicit conversion from Array[T] to ArrowAssoc[Array[T]] performed by method ArrowAssoc in scala.Predef.
Definition Classes
ArrowAssoc
Annotations
@inline()
def :+[B >: T](elem: B)(implicit arg0: ClassTag[B]): Array[B]

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
ArrayOps
def :+(elem: A): Array[A]
[use case] A copy of this array with an element appended.
[use case]
A copy of this array with an element appended.
A mnemonic for +: vs. :+ is: the COLon goes on the COLlection side.
Example:
```
scala> val a = List(1)
a: List[Int] = List(1)

scala> val b = a :+ 2
b: List[Int] = List(1, 2)

scala> println(a)
List(1)
```
elem
the appended element
returns
a new array consisting of all elements of this array followed by elem.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
SeqLike → GenSeqLike
Full Signature
def :+[B >: A, That](elem: B)(implicit bf: CanBuildFrom[Array[T], B, That]): That
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 addString(b: StringBuilder): StringBuilder
Appends all elements of this mutable indexed sequence to a string builder.
Appends all elements of this mutable indexed sequence to a string builder. The written text consists of the string representations (w.r.t. the method toString) of all elements of this mutable indexed sequence without any separator string.
Example:
```
scala> val a = List(1,2,3,4)
a: List[Int] = List(1, 2, 3, 4)

scala> val b = new StringBuilder()
b: StringBuilder =

scala> val h = a.addString(b)
h: StringBuilder = 1234
```
b
the string builder to which elements are appended.
returns
the string builder b to which elements were appended.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
TraversableOnce
def addString(b: StringBuilder, sep: String): StringBuilder
Appends all elements of this mutable indexed sequence to a string builder using a separator string.
Appends all elements of this mutable indexed sequence to a string builder using a separator string. The written text consists of the string representations (w.r.t. the method toString) of all elements of this mutable indexed sequence, separated by the string sep.
Example:
```
scala> val a = List(1,2,3,4)
a: List[Int] = List(1, 2, 3, 4)

scala> val b = new StringBuilder()
b: StringBuilder =

scala> a.addString(b, ", ")
res0: StringBuilder = 1, 2, 3, 4
```
b
the string builder to which elements are appended.
sep
the separator string.
returns
the string builder b to which elements were appended.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
TraversableOnce
def addString(b: StringBuilder, start: String, sep: String, end: String): StringBuilder
Appends all elements of this mutable indexed sequence to a string builder using start, end, and separator strings.
Appends all elements of this mutable indexed sequence to a string builder using start, end, and separator strings. The written text begins with the string start and ends with the string end. Inside, the string representations (w.r.t. the method toString) of all elements of this mutable indexed sequence are separated by the string sep.
Example:
```
scala> val a = List(1,2,3,4)
a: List[Int] = List(1, 2, 3, 4)

scala> val b = new StringBuilder()
b: StringBuilder =

scala> a.addString(b , "List(" , ", " , ")")
res5: StringBuilder = List(1, 2, 3, 4)
```
b
the string builder to which elements are appended.
start
the starting string.
sep
the separator string.
end
the ending string.
returns
the string builder b to which elements were appended.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
TraversableOnce
def aggregate[B](z: ⇒ B)(seqop: (B, T) ⇒ B, combop: (B, B) ⇒ B): B
Aggregates the results of applying an operator to subsequent elements.
Aggregates the results of applying an operator to subsequent elements.
This is a more general form of fold and reduce. It is similar to foldLeft in that it doesn't require the result to be a supertype of the element type. In addition, it allows parallel collections to be processed in chunks, and then combines the intermediate results.
aggregate splits the mutable indexed sequence into partitions and processes each partition by sequentially applying seqop, starting with z (like foldLeft). Those intermediate results are then combined by using combop (like fold). The implementation of this operation may operate on an arbitrary number of collection partitions (even 1), so combop may be invoked an arbitrary number of times (even 0).
As an example, consider summing up the integer values of a list of chars. The initial value for the sum is 0. First, seqop transforms each input character to an Int and adds it to the sum (of the partition). Then, combop just needs to sum up the intermediate results of the partitions:
```
List('a', 'b', 'c').aggregate(0)({ (sum, ch) => sum + ch.toInt }, { (p1, p2) => p1 + p2 })
```
B
the type of accumulated results
z
the initial value for the accumulated result of the partition - this will typically be the neutral element for the seqop operator (e.g. Nil for list concatenation or 0 for summation) and may be evaluated more than once
seqop
an operator used to accumulate results within a partition
combop
an associative operator used to combine results from different partitions

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
TraversableOnce → GenTraversableOnce
def apply(i: Int): T
The element at given index.
The element at given index.
Indices start at 0; xs.apply(0) is the first element of array xs. Note the indexing syntax xs(i) is a shorthand for xs.apply(i).
i
the index
returns
the element at the given index

Exceptions thrown
ArrayIndexOutOfBoundsException if i < 0 or length <= i
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 canEqual(that: Any): Boolean
Method called from equality methods, so that user-defined subclasses can refuse to be equal to other collections of the same kind.
Method called from equality methods, so that user-defined subclasses can refuse to be equal to other collections of the same kind.
that
The object with which this mutable indexed sequence should be compared
returns
true, if this mutable indexed sequence can possibly equal that, false otherwise. The test takes into consideration only the run-time types of objects but ignores their elements.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
IterableLike → Equals
def clone(): Array[T]
Clone the Array.
Clone the Array.
returns
A clone of the Array.

Definition Classes
Array → AnyRef
def collect[B](pf: PartialFunction[A, B]): Array[B]
[use case] Builds a new collection by applying a partial function to all elements of this array on which the function is defined.
[use case]
Builds a new collection by applying a partial function to all elements of this array on which the function is defined.
B
the element type of the returned collection.
pf
the partial function which filters and maps the array.
returns
a new array resulting from applying the given partial function pf to each element on which it is defined and collecting the results. The order of the elements is preserved.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
TraversableLike → GenTraversableLike
Full Signature
def collect[B, That](pf: PartialFunction[T, B])(implicit bf: CanBuildFrom[Array[T], B, That]): That
def collectFirst[B](pf: PartialFunction[T, B]): Option[B]
Finds the first element of the mutable indexed sequence for which the given partial function is defined, and applies the partial function to it.
Finds the first element of the mutable indexed sequence for which the given partial function is defined, and applies the partial function to it.
pf
the partial function
returns
an option value containing pf applied to the first value for which it is defined, or None if none exists.
Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
TraversableOnce
Example:
1. Seq("a", 1, 5L).collectFirst({ case x: Int => x*10 }) = Some(10)
def combinations(n: Int): collection.Iterator[Array[T]]
Iterates over combinations.
Iterates over combinations. A _combination_ of length n is a subsequence of the original sequence, with the elements taken in order. Thus, "xy" and "yy" are both length-2 combinations of "xyy", but "yx" is not. If there is more than one way to generate the same subsequence, only one will be returned.
For example, "xyyy" has three different ways to generate "xy" depending on whether the first, second, or third "y" is selected. However, since all are identical, only one will be chosen. Which of the three will be taken is an implementation detail that is not defined.
returns
An Iterator which traverses the possible n-element combinations of this mutable indexed sequence.
Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
SeqLike
Example:
1. "abbbc".combinations(2) = Iterator(ab, ac, bb, bc)
def contains[A1 >: A](elem: A1): Boolean
Tests whether this mutable indexed sequence contains a given value as an element.
Tests whether this mutable indexed sequence contains a given value as an element.
elem
the element to test.
returns
true if this mutable indexed sequence has an element that is equal (as determined by ==) to elem, false otherwise.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
SeqLike
def containsSlice[B](that: GenSeq[B]): Boolean
Tests whether this mutable indexed sequence contains a given sequence as a slice.
Tests whether this mutable indexed sequence contains a given sequence as a slice.
that
the sequence to test
returns
true if this mutable indexed sequence contains a slice with the same elements as that, otherwise false.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
SeqLike
def copyToArray(xs: Array[A], start: Int, len: Int): Unit
[use case] Copies the elements of this array to an array.
[use case]
Copies the elements of this array to an array. Fills the given array xs with at most len elements of this array, starting at position start. Copying will stop once either the end of the current array is reached, or the end of the target array is reached, or len elements have been copied.
xs
the array to fill.
start
the starting index.
len
the maximal number of elements to copy.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
ArrayOps → IndexedSeqOptimized → IterableLike → TraversableLike → TraversableOnce → GenTraversableOnce
Full Signature
def copyToArray[U >: T](xs: Array[U], start: Int, len: Int): Unit
def copyToArray(xs: Array[A]): Unit
[use case] Copies the elements of this array to an array.
[use case]
Copies the elements of this array to an array. Fills the given array xs with values of this array. Copying will stop once either the end of the current array is reached, or the end of the target array is reached.
xs
the array to fill.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
TraversableOnce → GenTraversableOnce
Full Signature
def copyToArray[B >: A](xs: Array[B]): Unit
def copyToArray(xs: Array[A], start: Int): Unit
[use case] Copies the elements of this array to an array.
[use case]
Copies the elements of this array to an array. Fills the given array xs with values of this array, beginning at index start. Copying will stop once either the end of the current array is reached, or the end of the target array is reached.
xs
the array to fill.
start
the starting index.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
TraversableOnce → GenTraversableOnce
Full Signature
def copyToArray[B >: A](xs: Array[B], start: Int): Unit
def copyToBuffer[B >: A](dest: Buffer[B]): Unit
Copies all elements of this mutable indexed sequence to a buffer.
Copies all elements of this mutable indexed sequence to a buffer.
dest
The buffer to which elements are copied.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
TraversableOnce
def corresponds[B](that: GenSeq[B])(p: (T, B) ⇒ Boolean): Boolean
Tests whether every element of this mutable indexed sequence relates to the corresponding element of another sequence by satisfying a test predicate.
Tests whether every element of this mutable indexed sequence relates to the corresponding element of another sequence by satisfying a test predicate.
B
the type of the elements of that
that
the other sequence
p
the test predicate, which relates elements from both sequences
returns
true if both sequences have the same length and p(x, y) is true for all corresponding elements x of this mutable indexed sequence and y of that, otherwise false.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
SeqLike → GenSeqLike
def count(p: (T) ⇒ Boolean): Int
Counts the number of elements in the mutable indexed sequence which satisfy a predicate.
Counts the number of elements in the mutable indexed sequence which satisfy a predicate.
p
the predicate used to test elements.
returns
the number of elements satisfying the predicate p.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
TraversableOnce → GenTraversableOnce
def deep: collection.IndexedSeq[Any]
Creates a possible nested IndexedSeq which consists of all the elements of this array.
Creates a possible nested IndexedSeq which consists of all the elements of this array. If the elements are arrays themselves, the deep transformation is applied recursively to them. The stringPrefix of the IndexedSeq is "Array", hence the IndexedSeq prints like an array with all its elements shown, and the same recursively for any subarrays.
Example:
```
Array(Array(1, 2), Array(3, 4)).deep.toString
```
prints: Array(Array(1, 2), Array(3, 4))
returns
An possibly nested indexed sequence of consisting of all the elements of the array.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
ArrayLike
def diff(that: collection.Seq[T]): Array[T]
[use case] Computes the multiset difference between this array and another sequence.
[use case]
Computes the multiset difference between this array and another sequence.
that
the sequence of elements to remove
returns
a new array which contains all elements of this array except some of occurrences of elements that also appear in that. If an element value x appears n times in that, then the first n occurrences of x will not form part of the result, but any following occurrences will.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
SeqLike → GenSeqLike
Full Signature
def diff[B >: A](that: GenSeq[B]): Array[T]
def distinct: Array[T]
Builds a new mutable indexed sequence from this mutable indexed sequence without any duplicate elements.
Builds a new mutable indexed sequence from this mutable indexed sequence without any duplicate elements.
returns
A new mutable indexed sequence which contains the first occurrence of every element of this mutable indexed sequence.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
SeqLike → GenSeqLike
def drop(n: Int): Array[T]
Selects all elements except first n ones.
Selects all elements except first n ones.
n
the number of elements to drop from this mutable indexed sequence.
returns
a mutable indexed sequence consisting of all elements of this mutable indexed sequence except the first n ones, or else the empty mutable indexed sequence, if this mutable indexed sequence has less than n elements. If n is negative, don't drop any elements.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
IndexedSeqOptimized → IterableLike → TraversableLike → GenTraversableLike
def dropRight(n: Int): Array[T]
Selects all elements except last n ones.
Selects all elements except last n ones.
n
The number of elements to take
returns
a mutable indexed sequence consisting of all elements of this mutable indexed sequence except the last n ones, or else the empty mutable indexed sequence, if this mutable indexed sequence has less than n elements.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
IndexedSeqOptimized → IterableLike
def dropWhile(p: (T) ⇒ Boolean): Array[T]
Drops longest prefix of elements that satisfy a predicate.
Drops longest prefix of elements that satisfy a predicate.
returns
the longest suffix of this mutable indexed sequence whose first element does not satisfy the predicate p.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
IndexedSeqOptimized → TraversableLike → GenTraversableLike
def endsWith[B](that: GenSeq[B]): Boolean
Tests whether this mutable indexed sequence ends with the given sequence.
Tests whether this mutable indexed sequence ends with the given sequence.
that
the sequence to test
returns
true if this mutable indexed sequence has that as a suffix, false otherwise.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
IndexedSeqOptimized → SeqLike → GenSeqLike
def ensuring(cond: (Array[T]) ⇒ Boolean, msg: ⇒ Any): Array[T]

Implicit
This member is added by an implicit conversion from Array[T] to Ensuring[Array[T]] performed by method Ensuring in scala.Predef.
Definition Classes
Ensuring
def ensuring(cond: (Array[T]) ⇒ Boolean): Array[T]

Implicit
This member is added by an implicit conversion from Array[T] to Ensuring[Array[T]] performed by method Ensuring in scala.Predef.
Definition Classes
Ensuring
def ensuring(cond: Boolean, msg: ⇒ Any): Array[T]

Implicit
This member is added by an implicit conversion from Array[T] to Ensuring[Array[T]] performed by method Ensuring in scala.Predef.
Definition Classes
Ensuring
def ensuring(cond: Boolean): Array[T]

Implicit
This member is added by an implicit conversion from Array[T] to Ensuring[Array[T]] performed by method Ensuring in scala.Predef.
Definition Classes
Ensuring
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(arg0: Any): 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 exists(p: (T) ⇒ Boolean): Boolean
Tests whether a predicate holds for at least one element of this mutable indexed sequence.
Tests whether a predicate holds for at least one element of this mutable indexed sequence.
p
the predicate used to test elements.
returns
false if this mutable indexed sequence is empty, otherwise true if the given predicate p holds for some of the elements of this mutable indexed sequence, otherwise false

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
IndexedSeqOptimized → IterableLike → TraversableLike → TraversableOnce → GenTraversableOnce
def filter(p: (T) ⇒ Boolean): Array[T]
Selects all elements of this mutable indexed sequence which satisfy a predicate.
Selects all elements of this mutable indexed sequence which satisfy a predicate.
p
the predicate used to test elements.
returns
a new mutable indexed sequence consisting of all elements of this mutable indexed sequence that satisfy the given predicate p. The order of the elements is preserved.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
TraversableLike → GenTraversableLike
def filterNot(p: (T) ⇒ Boolean): Array[T]
Selects all elements of this mutable indexed sequence which do not satisfy a predicate.
Selects all elements of this mutable indexed sequence which do not satisfy a predicate.
p
the predicate used to test elements.
returns
a new mutable indexed sequence consisting of all elements of this mutable indexed sequence that do not satisfy the given predicate p. The order of the elements is preserved.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
TraversableLike → GenTraversableLike
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 find(p: (T) ⇒ Boolean): Option[T]
Finds the first element of the mutable indexed sequence satisfying a predicate, if any.
Finds the first element of the mutable indexed sequence satisfying a predicate, if any.
p
the predicate used to test elements.
returns
an option value containing the first element in the mutable indexed sequence that satisfies p, or None if none exists.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
IndexedSeqOptimized → IterableLike → TraversableLike → TraversableOnce → GenTraversableOnce
def flatMap[B](f: (A) ⇒ GenTraversableOnce[B]): Array[B]
[use case] Builds a new collection by applying a function to all elements of this array and using the elements of the resulting collections.
[use case]
Builds a new collection by applying a function to all elements of this array and using the elements of the resulting collections.
For example:
```
def getWords(lines: Seq[String]): Seq[String] = lines flatMap (line => line split "\\W+")
```
The type of the resulting collection is guided by the static type of array. This might cause unexpected results sometimes. For example:
```
// lettersOf will return a Seq[Char] of likely repeated letters, instead of a Set
def lettersOf(words: Seq[String]) = words flatMap (word => word.toSet)

// lettersOf will return a Set[Char], not a Seq
def lettersOf(words: Seq[String]) = words.toSet flatMap (word => word.toSeq)

// xs will be an Iterable[Int]
val xs = Map("a" -> List(11,111), "b" -> List(22,222)).flatMap(_._2)

// ys will be a Map[Int, Int]
val ys = Map("a" -> List(1 -> 11,1 -> 111), "b" -> List(2 -> 22,2 -> 222)).flatMap(_._2)
```
B
the element type of the returned collection.
f
the function to apply to each element.
returns
a new array resulting from applying the given collection-valued function f to each element of this array and concatenating the results.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
TraversableLike → GenTraversableLike → FilterMonadic
Full Signature
def flatMap[B, That](f: (T) ⇒ GenTraversableOnce[B])(implicit bf: CanBuildFrom[Array[T], B, That]): That
def flatten[U](implicit asTrav: (T) ⇒ collection.Traversable[U], m: ClassTag[U]): Array[U]
Flattens a two-dimensional array by concatenating all its rows into a single array.
Flattens a two-dimensional array by concatenating all its rows into a single array.
U
Type of row elements.
asTrav
A function that converts elements of this array to rows - arrays of type U.
returns
An array obtained by concatenating rows of this array.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
ArrayOps
def fold[A1 >: A](z: A1)(op: (A1, A1) ⇒ A1): A1
Folds the elements of this mutable indexed sequence using the specified associative binary operator.
Folds the elements of this mutable indexed sequence using the specified associative binary operator.
The order in which operations are performed on elements is unspecified and may be nondeterministic.
A1
a type parameter for the binary operator, a supertype of A.
z
a neutral element for the fold operation; may be added to the result an arbitrary number of times, and must not change the result (e.g., Nil for list concatenation, 0 for addition, or 1 for multiplication).
op
a binary operator that must be associative.
returns
the result of applying the fold operator op between all the elements and z, or z if this mutable indexed sequence is empty.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
TraversableOnce → GenTraversableOnce
def foldLeft[B](z: B)(op: (B, T) ⇒ B): B
Applies a binary operator to a start value and all elements of this mutable indexed sequence, going left to right.
Applies a binary operator to a start value and all elements of this mutable indexed sequence, going left to right.
B
the result type of the binary operator.
z
the start value.
op
the binary operator.
returns
the result of inserting op between consecutive elements of this mutable indexed sequence, going left to right with the start value z on the left:
```
op(...op(z, x_1), x_2, ..., x_n)
```
where x₁, ..., x_n are the elements of this mutable indexed sequence. Returns z if this mutable indexed sequence is empty.
Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
IndexedSeqOptimized → TraversableOnce → GenTraversableOnce
def foldRight[B](z: B)(op: (T, B) ⇒ B): B
Applies a binary operator to all elements of this mutable indexed sequence and a start value, going right to left.
Applies a binary operator to all elements of this mutable indexed sequence and a start value, going right to left.
B
the result type of the binary operator.
z
the start value.
op
the binary operator.
returns
the result of inserting op between consecutive elements of this mutable indexed sequence, going right to left with the start value z on the right:
```
op(x_1, op(x_2, ... op(x_n, z)...))
```
where x₁, ..., x_n are the elements of this mutable indexed sequence. Returns z if this mutable indexed sequence is empty.
Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
IndexedSeqOptimized → IterableLike → TraversableOnce → GenTraversableOnce
def forall(p: (T) ⇒ Boolean): Boolean
Tests whether a predicate holds for all elements of this mutable indexed sequence.
Tests whether a predicate holds for all elements of this mutable indexed sequence.
p
the predicate used to test elements.
returns
true if this mutable indexed sequence is empty or the given predicate p holds for all elements of this mutable indexed sequence, otherwise false.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
IndexedSeqOptimized → IterableLike → TraversableLike → TraversableOnce → GenTraversableOnce
def foreach(f: (A) ⇒ Unit): Unit
[use case] Applies a function f to all elements of this array.
[use case]
Applies a function f to all elements of this array.
Note: this method underlies the implementation of most other bulk operations. Subclasses should re-implement this method if a more efficient implementation exists.
f
the function that is applied for its side-effect to every element. The result of function f is discarded.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
IndexedSeqOptimized → IterableLike → TraversableLike → GenTraversableLike → TraversableOnce → GenTraversableOnce → FilterMonadic
Full Signature
def foreach[U](f: (T) ⇒ U): Unit
final def getClass(): Class[_]
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 groupBy[K](f: (T) ⇒ K): Map[K, Array[T]]
Partitions this mutable indexed sequence into a map of mutable indexed sequences according to some discriminator function.
Partitions this mutable indexed sequence into a map of mutable indexed sequences according to some discriminator function.
Note: this method is not re-implemented by views. This means when applied to a view it will always force the view and return a new mutable indexed sequence.
K
the type of keys returned by the discriminator function.
f
the discriminator function.
returns
A map from keys to mutable indexed sequences such that the following invariant holds:
```
(xs groupBy f)(k) = xs filter (x => f(x) == k)
```
That is, every key k is bound to a mutable indexed sequence of those elements x for which f(x) equals k.
Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
TraversableLike → GenTraversableLike
def grouped(size: Int): collection.Iterator[Array[T]]
Partitions elements in fixed size mutable indexed sequences.
Partitions elements in fixed size mutable indexed sequences.
size
the number of elements per group
returns
An iterator producing mutable indexed sequences of size size, except the last will be less than size size if the elements don't divide evenly.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
IterableLike
See also
scala.collection.Iterator, method grouped
def hasDefiniteSize: Boolean
Tests whether this mutable indexed sequence is known to have a finite size.
Tests whether this mutable indexed sequence is known to have a finite size. All strict collections are known to have finite size. For a non-strict collection such as Stream, the predicate returns true if all elements have been computed. It returns false if the stream is not yet evaluated to the end. Non-empty Iterators usually return false even if they were created from a collection with a known finite size.
Note: many collection methods will not work on collections of infinite sizes. The typical failure mode is an infinite loop. These methods always attempt a traversal without checking first that hasDefiniteSize returns true. However, checking hasDefiniteSize can provide an assurance that size is well-defined and non-termination is not a concern.
returns
true if this collection is known to have finite size, false otherwise.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
TraversableLike → TraversableOnce → GenTraversableOnce
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()
def head: T
Selects the first element of this mutable indexed sequence.
Selects the first element of this mutable indexed sequence.
returns
the first element of this mutable indexed sequence.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
IndexedSeqOptimized → IterableLike → TraversableLike → GenTraversableLike
Exceptions thrown
NoSuchElementException if the mutable indexed sequence is empty.
def headOption: Option[T]
Optionally selects the first element.
Optionally selects the first element.
returns
the first element of this mutable indexed sequence if it is nonempty, None if it is empty.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
TraversableLike → GenTraversableLike
def indexOf(elem: T, from: Int): Int
[use case] Finds index of first occurrence of some value in this array after or at some start index.
[use case]
Finds index of first occurrence of some value in this array after or at some start index.
elem
the element value to search for.
from
the start index
returns
the index >= from of the first element of this array that is equal (as determined by ==) to elem, or -1, if none exists.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
GenSeqLike
Full Signature
def indexOf[B >: A](elem: B, from: Int): Int
def indexOf(elem: T): Int
[use case] Finds index of first occurrence of some value in this array.
[use case]
Finds index of first occurrence of some value in this array.
elem
the element value to search for.
returns
the index of the first element of this array that is equal (as determined by ==) to elem, or -1, if none exists.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
GenSeqLike
Full Signature
def indexOf[B >: A](elem: B): Int
def indexOfSlice[B >: A](that: GenSeq[B], from: Int): Int
Finds first index after or at a start index where this mutable indexed sequence contains a given sequence as a slice.
Finds first index after or at a start index where this mutable indexed sequence contains a given sequence as a slice.
that
the sequence to test
from
the start index
returns
the first index >= from such that the elements of this mutable indexed sequence starting at this index match the elements of sequence that, or -1 of no such subsequence exists.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
SeqLike
def indexOfSlice[B >: A](that: GenSeq[B]): Int
Finds first index where this mutable indexed sequence contains a given sequence as a slice.
Finds first index where this mutable indexed sequence contains a given sequence as a slice.
that
the sequence to test
returns
the first index such that the elements of this mutable indexed sequence starting at this index match the elements of sequence that, or -1 of no such subsequence exists.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
SeqLike
def indexWhere(p: (T) ⇒ Boolean, from: Int): Int
Finds index of the first element satisfying some predicate after or at some start index.
Finds index of the first element satisfying some predicate after or at some start index.
p
the predicate used to test elements.
from
the start index
returns
the index >= from of the first element of this mutable indexed sequence that satisfies the predicate p, or -1, if none exists.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
IndexedSeqOptimized → SeqLike → GenSeqLike
def indexWhere(p: (T) ⇒ Boolean): Int
Finds index of first element satisfying some predicate.
Finds index of first element satisfying some predicate.
p
the predicate used to test elements.
returns
the index of the first element of this mutable indexed sequence that satisfies the predicate p, or -1, if none exists.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
GenSeqLike
def indices: collection.immutable.Range
Produces the range of all indices of this sequence.
Produces the range of all indices of this sequence.
returns
a Range value from 0 to one less than the length of this mutable indexed sequence.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
SeqLike
def init: Array[T]
Selects all elements except the last.
Selects all elements except the last.
returns
a mutable indexed sequence consisting of all elements of this mutable indexed sequence except the last one.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
IndexedSeqOptimized → TraversableLike → GenTraversableLike
Exceptions thrown
UnsupportedOperationException if the mutable indexed sequence is empty.
def inits: collection.Iterator[Array[T]]
Iterates over the inits of this mutable indexed sequence.
Iterates over the inits of this mutable indexed sequence. The first value will be this mutable indexed sequence and the final one will be an empty mutable indexed sequence, with the intervening values the results of successive applications of init.
returns
an iterator over all the inits of this mutable indexed sequence
Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
TraversableLike
Example:
1. List(1,2,3).inits = Iterator(List(1,2,3), List(1,2), List(1), Nil)
def intersect(that: collection.Seq[T]): Array[T]
[use case] Computes the multiset intersection between this array and another sequence.
[use case]
Computes the multiset intersection between this array and another sequence.
that
the sequence of elements to intersect with.
returns
a new array which contains all elements of this array which also appear in that. If an element value x appears n times in that, then the first n occurrences of x will be retained in the result, but any following occurrences will be omitted.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
SeqLike → GenSeqLike
Full Signature
def intersect[B >: A](that: GenSeq[B]): Array[T]
def isDefinedAt(idx: Int): Boolean
Tests whether this mutable indexed sequence contains given index.
Tests whether this mutable indexed sequence contains given index.
The implementations of methods apply and isDefinedAt turn a Seq[A] into a PartialFunction[Int, A].
idx
the index to test
returns
true if this mutable indexed sequence contains an element at position idx, false otherwise.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
GenSeqLike
def isEmpty: Boolean
Tests whether this mutable indexed sequence is empty.
Tests whether this mutable indexed sequence is empty.
returns
true if the mutable indexed sequence contain no elements, false otherwise.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
IndexedSeqOptimized → SeqLike → IterableLike → TraversableLike → TraversableOnce → GenTraversableOnce
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 return false, while the expression List(1).isInstanceOf[List[String]] will return true. 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
true if the receiver object is an instance of erasure of type T0; false otherwise.

Definition Classes
Any
final def isTraversableAgain: Boolean
Tests whether this mutable indexed sequence can be repeatedly traversed.
Tests whether this mutable indexed sequence can be repeatedly traversed.
returns
true

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
TraversableLike → GenTraversableLike → GenTraversableOnce
def iterator: collection.Iterator[T]
Creates a new iterator over all elements contained in this iterable object.
Creates a new iterator over all elements contained in this iterable object.
returns
the new iterator

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
IndexedSeqLike → IterableLike → GenIterableLike
def last: T
Selects the last element.
Selects the last element.
returns
The last element of this mutable indexed sequence.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
IndexedSeqOptimized → TraversableLike → GenTraversableLike
Exceptions thrown
NoSuchElementException If the mutable indexed sequence is empty.
def lastIndexOf(elem: T, end: Int): Int
[use case] Finds index of last occurrence of some value in this array before or at a given end index.
[use case]
Finds index of last occurrence of some value in this array before or at a given end index.
elem
the element value to search for.
end
the end index.
returns
the index <= end of the last element of this array that is equal (as determined by ==) to elem, or -1, if none exists.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
GenSeqLike
Full Signature
def lastIndexOf[B >: A](elem: B, end: Int): Int
def lastIndexOf(elem: T): Int
[use case] Finds index of last occurrence of some value in this array.
[use case]
Finds index of last occurrence of some value in this array.
elem
the element value to search for.
returns
the index of the last element of this array that is equal (as determined by ==) to elem, or -1, if none exists.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
GenSeqLike
Full Signature
def lastIndexOf[B >: A](elem: B): Int
def lastIndexOfSlice[B >: A](that: GenSeq[B], end: Int): Int
Finds last index before or at a given end index where this mutable indexed sequence contains a given sequence as a slice.
Finds last index before or at a given end index where this mutable indexed sequence contains a given sequence as a slice.
that
the sequence to test
end
the end index
returns
the last index <= end such that the elements of this mutable indexed sequence starting at this index match the elements of sequence that, or -1 of no such subsequence exists.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
SeqLike
def lastIndexOfSlice[B >: A](that: GenSeq[B]): Int
Finds last index where this mutable indexed sequence contains a given sequence as a slice.
Finds last index where this mutable indexed sequence contains a given sequence as a slice.
that
the sequence to test
returns
the last index such that the elements of this mutable indexed sequence starting a this index match the elements of sequence that, or -1 of no such subsequence exists.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
SeqLike
def lastIndexWhere(p: (T) ⇒ Boolean, end: Int): Int
Finds index of last element satisfying some predicate before or at given end index.
Finds index of last element satisfying some predicate before or at given end index.
p
the predicate used to test elements.
returns
the index <= end of the last element of this mutable indexed sequence that satisfies the predicate p, or -1, if none exists.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
IndexedSeqOptimized → SeqLike → GenSeqLike
def lastIndexWhere(p: (T) ⇒ Boolean): Int
Finds index of last element satisfying some predicate.
Finds index of last element satisfying some predicate.
p
the predicate used to test elements.
returns
the index of the last element of this mutable indexed sequence that satisfies the predicate p, or -1, if none exists.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
GenSeqLike
def lastOption: Option[T]
Optionally selects the last element.
Optionally selects the last element.
returns
the last element of this mutable indexed sequence$ if it is nonempty, None if it is empty.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
TraversableLike → GenTraversableLike
def length: Int
The length of the array
def lengthCompare(len: Int): Int
Compares the length of this mutable indexed sequence to a test value.
Compares the length of this mutable indexed sequence to a test value.
len
the test value that gets compared with the length.
returns
A value x where
```
x <  0       if this.length <  len
x == 0       if this.length == len
x >  0       if this.length >  len
```
The method as implemented here does not call length directly; its running time is O(length min len) instead of O(length). The method should be overwritten if computing length is cheap.
Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
IndexedSeqOptimized → SeqLike
def map[B](f: (A) ⇒ B): Array[B]
[use case] Builds a new collection by applying a function to all elements of this array.
[use case]
Builds a new collection by applying a function to all elements of this array.
B
the element type of the returned collection.
f
the function to apply to each element.
returns
a new array resulting from applying the given function f to each element of this array and collecting the results.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
TraversableLike → GenTraversableLike → FilterMonadic
Full Signature
def map[B, That](f: (T) ⇒ B)(implicit bf: CanBuildFrom[Array[T], B, That]): That
def max: A
[use case] Finds the largest element.
[use case]
Finds the largest element.
returns
the largest element of this array.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
TraversableOnce → GenTraversableOnce
Full Signature
def max[B >: A](implicit cmp: Ordering[B]): T

Exceptions thrown
UnsupportedOperationException if this array is empty.
def maxBy[B](f: (A) ⇒ B): A
[use case] Finds the first element which yields the largest value measured by function f.
[use case]
Finds the first element which yields the largest value measured by function f.
B
The result type of the function f.
f
The measuring function.
returns
the first element of this array with the largest value measured by function f.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
TraversableOnce → GenTraversableOnce
Full Signature
def maxBy[B](f: (T) ⇒ B)(implicit cmp: Ordering[B]): T

Exceptions thrown
UnsupportedOperationException if this array is empty.
def min: A
[use case] Finds the smallest element.
[use case]
Finds the smallest element.
returns
the smallest element of this array

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
TraversableOnce → GenTraversableOnce
Full Signature
def min[B >: A](implicit cmp: Ordering[B]): T

Exceptions thrown
UnsupportedOperationException if this array is empty.
def minBy[B](f: (A) ⇒ B): A
[use case] Finds the first element which yields the smallest value measured by function f.
[use case]
Finds the first element which yields the smallest value measured by function f.
B
The result type of the function f.
f
The measuring function.
returns
the first element of this array with the smallest value measured by function f.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
TraversableOnce → GenTraversableOnce
Full Signature
def minBy[B](f: (T) ⇒ B)(implicit cmp: Ordering[B]): T

Exceptions thrown
UnsupportedOperationException if this array is empty.
def mkString: String
Displays all elements of this mutable indexed sequence in a string.
Displays all elements of this mutable indexed sequence in a string.
returns
a string representation of this mutable indexed sequence. In the resulting string the string representations (w.r.t. the method toString) of all elements of this mutable indexed sequence follow each other without any separator string.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
TraversableOnce → GenTraversableOnce
def mkString(sep: String): String
Displays all elements of this mutable indexed sequence in a string using a separator string.
Displays all elements of this mutable indexed sequence in a string using a separator string.
sep
the separator string.
returns
a string representation of this mutable indexed sequence. In the resulting string the string representations (w.r.t. the method toString) of all elements of this mutable indexed sequence are separated by the string sep.
Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
TraversableOnce → GenTraversableOnce
Example:
1. List(1, 2, 3).mkString("|") = "1|2|3"
def mkString(start: String, sep: String, end: String): String
Displays all elements of this mutable indexed sequence in a string using start, end, and separator strings.
Displays all elements of this mutable indexed sequence in a string using start, end, and separator strings.
start
the starting string.
sep
the separator string.
end
the ending string.
returns
a string representation of this mutable indexed sequence. The resulting string begins with the string start and ends with the string end. Inside, the string representations (w.r.t. the method toString) of all elements of this mutable indexed sequence are separated by the string sep.
Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
TraversableOnce → GenTraversableOnce
Example:
1. List(1, 2, 3).mkString("(", "; ", ")") = "(1; 2; 3)"
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 nonEmpty: Boolean
Tests whether the mutable indexed sequence is not empty.
Tests whether the mutable indexed sequence is not empty.
returns
true if the mutable indexed sequence contains at least one element, false otherwise.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
TraversableOnce → GenTraversableOnce
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 padTo(len: Int, elem: A): Array[A]
[use case] A copy of this array with an element value appended until a given target length is reached.
[use case]
A copy of this array with an element value appended until a given target length is reached.
len
the target length
elem
the padding value
returns
a new array consisting of all elements of this array followed by the minimal number of occurrences of elem so that the resulting array has a length of at least len.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
SeqLike → GenSeqLike
Full Signature
def padTo[B >: A, That](len: Int, elem: B)(implicit bf: CanBuildFrom[Array[T], B, That]): That
def par: ParArray[T]
Returns a parallel implementation of this collection.
Returns a parallel implementation of this collection.
For most collection types, this method creates a new parallel collection by copying all the elements. For these collection, par takes linear time. Mutable collections in this category do not produce a mutable parallel collection that has the same underlying dataset, so changes in one collection will not be reflected in the other one.
Specific collections (e.g. ParArray or mutable.ParHashMap) override this default behaviour by creating a parallel collection which shares the same underlying dataset. For these collections, par takes constant or sublinear time.
All parallel collections return a reference to themselves.
returns
a parallel implementation of this collection

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
ArrayOps → CustomParallelizable → Parallelizable
def partition(p: (T) ⇒ Boolean): (Array[T], Array[T])
Partitions this mutable indexed sequence in two mutable indexed sequences according to a predicate.
Partitions this mutable indexed sequence in two mutable indexed sequences according to a predicate.
p
the predicate on which to partition.
returns
a pair of mutable indexed sequences: the first mutable indexed sequence consists of all elements that satisfy the predicate p and the second mutable indexed sequence consists of all elements that don't. The relative order of the elements in the resulting mutable indexed sequences is the same as in the original mutable indexed sequence.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
TraversableLike → GenTraversableLike
def patch(from: Int, that: GenSeq[A], replaced: Int): Array[A]
[use case] Produces a new array where a slice of elements in this array is replaced by another sequence.
[use case]
Produces a new array where a slice of elements in this array is replaced by another sequence.
from
the index of the first replaced element
replaced
the number of elements to drop in the original array
returns
a new array consisting of all elements of this array except that replaced elements starting from from are replaced by patch.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
SeqLike → GenSeqLike
Full Signature
def patch[B >: A, That](from: Int, patch: GenSeq[B], replaced: Int)(implicit bf: CanBuildFrom[Array[T], B, That]): That
def permutations: collection.Iterator[Array[T]]
Iterates over distinct permutations.
Iterates over distinct permutations.
returns
An Iterator which traverses the distinct permutations of this mutable indexed sequence.
Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
SeqLike
Example:
1. "abb".permutations = Iterator(abb, bab, bba)
def prefixLength(p: (T) ⇒ Boolean): Int
Returns the length of the longest prefix whose elements all satisfy some predicate.
Returns the length of the longest prefix whose elements all satisfy some predicate.
p
the predicate used to test elements.
returns
the length of the longest prefix of this mutable indexed sequence such that every element of the segment satisfies the predicate p.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
GenSeqLike
def product: A
[use case] Multiplies up the elements of this collection.
[use case]
Multiplies up the elements of this collection.
returns
the product of all elements in this array of numbers of type Int. Instead of Int, any other type T with an implicit Numeric[T] implementation can be used as element type of the array and as result type of product. Examples of such types are: Long, Float, Double, BigInt.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
TraversableOnce → GenTraversableOnce
Full Signature
def product[B >: A](implicit num: Numeric[B]): B
def reduce[A1 >: A](op: (A1, A1) ⇒ A1): A1
Reduces the elements of this mutable indexed sequence using the specified associative binary operator.
Reduces the elements of this mutable indexed sequence using the specified associative binary operator.
The order in which operations are performed on elements is unspecified and may be nondeterministic.
A1
A type parameter for the binary operator, a supertype of A.
op
A binary operator that must be associative.
returns
The result of applying reduce operator op between all the elements if the mutable indexed sequence is nonempty.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
TraversableOnce → GenTraversableOnce
Exceptions thrown
UnsupportedOperationException if this mutable indexed sequence is empty.
def reduceLeft[B >: A](op: (B, T) ⇒ B): B
Applies a binary operator to all elements of this mutable indexed sequence, going left to right.
Applies a binary operator to all elements of this mutable indexed sequence, going left to right.
B
the result type of the binary operator.
op
the binary operator.
returns
the result of inserting op between consecutive elements of this mutable indexed sequence, going left to right:
```
op( op( ... op(x_1, x_2) ..., x_{n-1}), x_n)
```
where x₁, ..., x_n are the elements of this mutable indexed sequence.
Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
IndexedSeqOptimized → TraversableOnce
Exceptions thrown
UnsupportedOperationException if this mutable indexed sequence is empty.
def reduceLeftOption[B >: A](op: (B, T) ⇒ B): Option[B]
Optionally applies a binary operator to all elements of this mutable indexed sequence, going left to right.
Optionally applies a binary operator to all elements of this mutable indexed sequence, going left to right.
B
the result type of the binary operator.
op
the binary operator.
returns
an option value containing the result of reduceLeft(op) if this mutable indexed sequence is nonempty, None otherwise.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
TraversableOnce → GenTraversableOnce
def reduceOption[A1 >: A](op: (A1, A1) ⇒ A1): Option[A1]
Reduces the elements of this mutable indexed sequence, if any, using the specified associative binary operator.
Reduces the elements of this mutable indexed sequence, if any, using the specified associative binary operator.
The order in which operations are performed on elements is unspecified and may be nondeterministic.
A1
A type parameter for the binary operator, a supertype of A.
op
A binary operator that must be associative.
returns
An option value containing result of applying reduce operator op between all the elements if the collection is nonempty, and None otherwise.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
TraversableOnce → GenTraversableOnce
def reduceRight[B >: A](op: (T, B) ⇒ B): B
Applies a binary operator to all elements of this mutable indexed sequence, going right to left.
Applies a binary operator to all elements of this mutable indexed sequence, going right to left.
B
the result type of the binary operator.
op
the binary operator.
returns
the result of inserting op between consecutive elements of this mutable indexed sequence, going right to left:
```
op(x_1, op(x_2, ..., op(x_{n-1}, x_n)...))
```
where x₁, ..., x_n are the elements of this mutable indexed sequence.
Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
IndexedSeqOptimized → IterableLike → TraversableOnce → GenTraversableOnce
Exceptions thrown
UnsupportedOperationException if this mutable indexed sequence is empty.
def reduceRightOption[B >: A](op: (T, B) ⇒ B): Option[B]
Optionally applies a binary operator to all elements of this mutable indexed sequence, going right to left.
Optionally applies a binary operator to all elements of this mutable indexed sequence, going right to left.
B
the result type of the binary operator.
op
the binary operator.
returns
an option value containing the result of reduceRight(op) if this mutable indexed sequence is nonempty, None otherwise.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
TraversableOnce → GenTraversableOnce
def repr: Array[T]
The collection of type mutable indexed sequence underlying this TraversableLike object.
The collection of type mutable indexed sequence underlying this TraversableLike object. By default this is implemented as the TraversableLike object itself, but this can be overridden.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
TraversableLike → GenTraversableLike
def reverse: Array[T]
Returns new mutable indexed sequence with elements in reversed order.
Returns new mutable indexed sequence with elements in reversed order.
returns
A new mutable indexed sequence with all elements of this mutable indexed sequence in reversed order.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
IndexedSeqOptimized → SeqLike → GenSeqLike
def reverseIterator: collection.Iterator[T]
An iterator yielding elements in reversed order.
An iterator yielding elements in reversed order.
Note: xs.reverseIterator is the same as xs.reverse.iterator but might be more efficient.
returns
an iterator yielding the elements of this mutable indexed sequence in reversed order

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
IndexedSeqOptimized → SeqLike
def reverseMap[B](f: (A) ⇒ B): Array[B]
[use case] Builds a new collection by applying a function to all elements of this array and collecting the results in reversed order.
[use case]
Builds a new collection by applying a function to all elements of this array and collecting the results in reversed order.
Note: xs.reverseMap(f) is the same as xs.reverse.map(f) but might be more efficient.
B
the element type of the returned collection.
f
the function to apply to each element.
returns
a new array resulting from applying the given function f to each element of this array and collecting the results in reversed order.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
SeqLike → GenSeqLike
Full Signature
def reverseMap[B, That](f: (T) ⇒ B)(implicit bf: CanBuildFrom[Array[T], B, That]): That
def sameElements(that: GenIterable[A]): Boolean
[use case] Checks if the other iterable collection contains the same elements in the same order as this array.
[use case]
Checks if the other iterable collection contains the same elements in the same order as this array.
that
the collection to compare with.
returns
true, if both collections contain the same elements in the same order, false otherwise.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
IndexedSeqOptimized → IterableLike → GenIterableLike
Full Signature
def sameElements[B >: A](that: GenIterable[B]): Boolean
def scan[B >: A, That](z: B)(op: (B, B) ⇒ B)(implicit cbf: CanBuildFrom[Array[T], B, That]): That
Computes a prefix scan of the elements of the collection.
Computes a prefix scan of the elements of the collection.
Note: The neutral element z may be applied more than once.
B
element type of the resulting collection
That
type of the resulting collection
z
neutral element for the operator op
op
the associative operator for the scan
cbf
combiner factory which provides a combiner
returns
a new mutable indexed sequence containing the prefix scan of the elements in this mutable indexed sequence

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
TraversableLike → GenTraversableLike
def scanLeft[B, That](z: B)(op: (B, T) ⇒ B)(implicit bf: CanBuildFrom[Array[T], B, That]): That
Produces a collection containing cumulative results of applying the operator going left to right.
Produces a collection containing cumulative results of applying the operator going left to right.
B
the type of the elements in the resulting collection
That
the actual type of the resulting collection
z
the initial value
op
the binary operator applied to the intermediate result and the element
bf
an implicit value of class CanBuildFrom which determines the result class That from the current representation type Repr and the new element type B.
returns
collection with intermediate results

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
TraversableLike → GenTraversableLike
def scanRight[B, That](z: B)(op: (T, B) ⇒ B)(implicit bf: CanBuildFrom[Array[T], B, That]): That
Produces a collection containing cumulative results of applying the operator going right to left.
Produces a collection containing cumulative results of applying the operator going right to left. The head of the collection is the last cumulative result.
Example:
```
List(1, 2, 3, 4).scanRight(0)(_ + _) == List(10, 9, 7, 4, 0)
```
B
the type of the elements in the resulting collection
That
the actual type of the resulting collection
z
the initial value
op
the binary operator applied to the intermediate result and the element
bf
an implicit value of class CanBuildFrom which determines the result class That from the current representation type Repr and the new element type B.
returns
collection with intermediate results

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
TraversableLike → GenTraversableLike
Annotations
@migration
Migration
(Changed in version 2.9.0) The behavior of scanRight has changed. The previous behavior can be reproduced with scanRight.reverse.
def segmentLength(p: (T) ⇒ Boolean, from: Int): Int
Computes length of longest segment whose elements all satisfy some predicate.
Computes length of longest segment whose elements all satisfy some predicate.
p
the predicate used to test elements.
from
the index where the search starts.
returns
the length of the longest segment of this mutable indexed sequence starting from index from such that every element of the segment satisfies the predicate p.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
IndexedSeqOptimized → SeqLike → GenSeqLike
def seq: collection.mutable.IndexedSeq[T]
A version of this collection with all of the operations implemented sequentially (i.e., in a single-threaded manner).
A version of this collection with all of the operations implemented sequentially (i.e., in a single-threaded manner).
This method returns a reference to this collection. In parallel collections, it is redefined to return a sequential implementation of this collection. In both cases, it has O(1) complexity.
returns
a sequential view of the collection.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
ArrayOps → IndexedSeqLike → GenSeqLike → Parallelizable → TraversableOnce → GenTraversableOnce
def size: Int
The size of this mutable indexed sequence, equivalent to length.
The size of this mutable indexed sequence, equivalent to length.
returns
the number of elements in this mutable indexed sequence.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
SeqLike → GenTraversableLike → TraversableOnce → GenTraversableOnce
def slice(from: Int, until: Int): Array[T]
Selects an interval of elements.
Selects an interval of elements. The returned collection is made up of all elements x which satisfy the invariant:
```
from <= indexOf(x) < until
```
returns
a mutable indexed sequence containing the elements greater than or equal to index from extending up to (but not including) index until of this mutable indexed sequence.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
ArrayOps → IndexedSeqOptimized → IterableLike → TraversableLike → GenTraversableLike
def sliding(size: Int, step: Int): collection.Iterator[Array[T]]
Groups elements in fixed size blocks by passing a "sliding window" over them (as opposed to partitioning them, as is done in grouped.)
Groups elements in fixed size blocks by passing a "sliding window" over them (as opposed to partitioning them, as is done in grouped.)
size
the number of elements per group
step
the distance between the first elements of successive groups
returns
An iterator producing mutable indexed sequences of size size, except the last element (which may be the only element) will be truncated if there are fewer than size elements remaining to be grouped.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
IterableLike
See also
scala.collection.Iterator, method sliding
def sliding(size: Int): collection.Iterator[Array[T]]
Groups elements in fixed size blocks by passing a "sliding window" over them (as opposed to partitioning them, as is done in grouped.) The "sliding window" step is set to one.
Groups elements in fixed size blocks by passing a "sliding window" over them (as opposed to partitioning them, as is done in grouped.) The "sliding window" step is set to one.
size
the number of elements per group
returns
An iterator producing mutable indexed sequences of size size, except the last element (which may be the only element) will be truncated if there are fewer than size elements remaining to be grouped.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
IterableLike
See also
scala.collection.Iterator, method sliding
def sortBy[B](f: (T) ⇒ B)(implicit ord: math.Ordering[B]): Array[T]
Sorts this Array according to the Ordering which results from transforming an implicitly given Ordering with a transformation function.
Sorts this Array according to the Ordering which results from transforming an implicitly given Ordering with a transformation function.
B
the target type of the transformation f, and the type where the ordering ord is defined.
f
the transformation function mapping elements to some other domain B.
ord
the ordering assumed on domain B.
returns
a mutable indexed sequence consisting of the elements of this mutable indexed sequence sorted according to the ordering where x < y if ord.lt(f(x), f(y)).
Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
SeqLike
Example:
1. val words = "The quick brown fox jumped over the lazy dog".split(' ') // this works because scala.Ordering will implicitly provide an Ordering[Tuple2[Int, Char]] words.sortBy(x => (x.length, x.head)) res0: Array[String] = Array(The, dog, fox, the, lazy, over, brown, quick, jumped)
See also
scala.math.Ordering
def sortWith(lt: (T, T) ⇒ Boolean): Array[T]
Sorts this mutable indexed sequence according to a comparison function.
Sorts this mutable indexed sequence according to a comparison function.
The sort is stable. That is, elements that are equal (as determined by lt) appear in the same order in the sorted sequence as in the original.
lt
the comparison function which tests whether its first argument precedes its second argument in the desired ordering.
returns
a mutable indexed sequence consisting of the elements of this mutable indexed sequence sorted according to the comparison function lt.
Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
SeqLike
Example:
1. List("Steve", "Tom", "John", "Bob").sortWith(_.compareTo(_) < 0) = List("Bob", "John", "Steve", "Tom")
def sorted[B >: A](implicit ord: math.Ordering[B]): Array[T]
Sorts this mutable indexed sequence according to an Ordering.
Sorts this mutable indexed sequence according to an Ordering.
The sort is stable. That is, elements that are equal (as determined by lt) appear in the same order in the sorted sequence as in the original.
ord
the ordering to be used to compare elements.
returns
a mutable indexed sequence consisting of the elements of this mutable indexed sequence sorted according to the ordering ord.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
SeqLike
See also
scala.math.Ordering
def span(p: (T) ⇒ Boolean): (Array[T], Array[T])
Splits this mutable indexed sequence into a prefix/suffix pair according to a predicate.
Splits this mutable indexed sequence into a prefix/suffix pair according to a predicate.
Note: c span p is equivalent to (but possibly more efficient than) (c takeWhile p, c dropWhile p), provided the evaluation of the predicate p does not cause any side-effects.
returns
a pair consisting of the longest prefix of this mutable indexed sequence whose elements all satisfy p, and the rest of this mutable indexed sequence.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
IndexedSeqOptimized → TraversableLike → GenTraversableLike
def splitAt(n: Int): (Array[T], Array[T])
Splits this mutable indexed sequence into two at a given position.
Splits this mutable indexed sequence into two at a given position. Note: c splitAt n is equivalent to (but possibly more efficient than) (c take n, c drop n).
n
the position at which to split.
returns
a pair of mutable indexed sequences consisting of the first n elements of this mutable indexed sequence, and the other elements.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
IndexedSeqOptimized → TraversableLike → GenTraversableLike
def startsWith[B](that: GenSeq[B], offset: Int): Boolean
Tests whether this mutable indexed sequence contains the given sequence at a given index.
Tests whether this mutable indexed sequence contains the given sequence at a given index.
Note: If the both the receiver object this and the argument that are infinite sequences this method may not terminate.
that
the sequence to test
offset
the index where the sequence is searched.
returns
true if the sequence that is contained in this mutable indexed sequence at index offset, otherwise false.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
IndexedSeqOptimized → SeqLike → GenSeqLike
def startsWith[B](that: GenSeq[B]): Boolean
Tests whether this mutable indexed sequence starts with the given sequence.
Tests whether this mutable indexed sequence starts with the given sequence.
that
the sequence to test
returns
true if this collection has that as a prefix, false otherwise.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
GenSeqLike
def stringPrefix: String
Defines the prefix of this object's toString representation.
Defines the prefix of this object's toString representation.
returns
a string representation which starts the result of toString applied to this mutable indexed sequence. By default the string prefix is the simple name of the collection class mutable indexed sequence.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
TraversableLike → GenTraversableLike
def sum: A
[use case] Sums up the elements of this collection.
[use case]
Sums up the elements of this collection.
returns
the sum of all elements in this array of numbers of type Int. Instead of Int, any other type T with an implicit Numeric[T] implementation can be used as element type of the array and as result type of sum. Examples of such types are: Long, Float, Double, BigInt.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
TraversableOnce → GenTraversableOnce
Full Signature
def sum[B >: A](implicit num: Numeric[B]): B
final def synchronized[T0](arg0: ⇒ T0): T0

Definition Classes
AnyRef
def tail: Array[T]
Selects all elements except the first.
Selects all elements except the first.
returns
a mutable indexed sequence consisting of all elements of this mutable indexed sequence except the first one.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
IndexedSeqOptimized → TraversableLike → GenTraversableLike
Exceptions thrown
java.lang.UnsupportedOperationException if the mutable indexed sequence is empty.
def tails: collection.Iterator[Array[T]]
Iterates over the tails of this mutable indexed sequence.
Iterates over the tails of this mutable indexed sequence. The first value will be this mutable indexed sequence and the final one will be an empty mutable indexed sequence, with the intervening values the results of successive applications of tail.
returns
an iterator over all the tails of this mutable indexed sequence
Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
TraversableLike
Example:
1. List(1,2,3).tails = Iterator(List(1,2,3), List(2,3), List(3), Nil)
def take(n: Int): Array[T]
Selects first n elements.
Selects first n elements.
n
the number of elements to take from this mutable indexed sequence.
returns
a mutable indexed sequence consisting only of the first n elements of this mutable indexed sequence, or else the whole mutable indexed sequence, if it has less than n elements. If n is negative, returns an empty mutable indexed sequence.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
IndexedSeqOptimized → IterableLike → TraversableLike → GenTraversableLike
def takeRight(n: Int): Array[T]
Selects last n elements.
Selects last n elements.
n
the number of elements to take
returns
a mutable indexed sequence consisting only of the last n elements of this mutable indexed sequence, or else the whole mutable indexed sequence, if it has less than n elements.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
IndexedSeqOptimized → IterableLike
def takeWhile(p: (T) ⇒ Boolean): Array[T]
Takes longest prefix of elements that satisfy a predicate.
Takes longest prefix of elements that satisfy a predicate.
returns
the longest prefix of this mutable indexed sequence whose elements all satisfy the predicate p.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
IndexedSeqOptimized → IterableLike → TraversableLike → GenTraversableLike
def to[Col[_]]: Col[A]
[use case] Converts this array into another by copying all elements.
[use case]
Converts this array into another by copying all elements.
Col
The collection type to build.
returns
a new collection containing all elements of this array.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
TraversableLike → TraversableOnce → GenTraversableOnce
Full Signature
def to[Col[_]](implicit cbf: CanBuildFrom[Nothing, T, Col[T]]): Col[T]
def toArray: Array[A]
[use case] Converts this array to an array.
[use case]
Converts this array to an array.
returns
an array containing all elements of this array. An ClassTag must be available for the element type of this array.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
ArrayOps → TraversableOnce → GenTraversableOnce
Full Signature
def toArray[U >: T](implicit arg0: ClassTag[U]): Array[U]
def toBuffer[A1 >: A]: Buffer[A1]
Uses the contents of this mutable indexed sequence to create a new mutable buffer.
Uses the contents of this mutable indexed sequence to create a new mutable buffer.
returns
a buffer containing all elements of this mutable indexed sequence.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
IndexedSeqLike → TraversableOnce → GenTraversableOnce
def toIndexedSeq: collection.immutable.IndexedSeq[T]
Converts this mutable indexed sequence to an indexed sequence.
Converts this mutable indexed sequence to an indexed sequence.
returns
an indexed sequence containing all elements of this mutable indexed sequence.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
TraversableOnce → GenTraversableOnce
def toIterable: collection.Iterable[T]
Returns this mutable indexed sequence as an iterable collection.
Returns this mutable indexed sequence as an iterable collection.
A new collection will not be built; lazy collections will stay lazy.
returns
an Iterable containing all elements of this mutable indexed sequence.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
IterableLike → TraversableOnce → GenTraversableOnce
def toIterator: collection.Iterator[T]
Returns an Iterator over the elements in this mutable indexed sequence.
Returns an Iterator over the elements in this mutable indexed sequence. Produces the same result as iterator.
returns
an Iterator containing all elements of this mutable indexed sequence.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
IterableLike → TraversableLike → GenTraversableOnce
Annotations
@deprecatedOverriding( message = ... , since = "2.11.0" )
def toList: List[T]
Converts this mutable indexed sequence to a list.
Converts this mutable indexed sequence to a list.
returns
a list containing all elements of this mutable indexed sequence.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
IndexedSeqOptimized → TraversableOnce → GenTraversableOnce
def toMap[T, U]: Map[T, U]
[use case] Converts this array to a map.
[use case]
Converts this array to a map. This method is unavailable unless the elements are members of Tuple2, each ((T, U)) becoming a key-value pair in the map. Duplicate keys will be overwritten by later keys: if this is an unordered collection, which key is in the resulting map is undefined.
returns
a map of type immutable.Map[T, U] containing all key/value pairs of type (T, U) of this array.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
TraversableOnce → GenTraversableOnce
Full Signature
def toMap[T, U](implicit ev: <:<[T, (T, U)]): Map[T, U]
def toSeq: collection.Seq[T]
Converts this mutable indexed sequence to a sequence.
Converts this mutable indexed sequence to a sequence.
A new collection will not be built; in particular, lazy sequences will stay lazy.
returns
a sequence containing all elements of this mutable indexed sequence.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
SeqLike → GenSeqLike → TraversableOnce → GenTraversableOnce
def toSet[B >: A]: Set[B]
Converts this mutable indexed sequence to a set.
Converts this mutable indexed sequence to a set.
returns
a set containing all elements of this mutable indexed sequence.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
TraversableOnce → GenTraversableOnce
def toStream: collection.immutable.Stream[T]
Converts this mutable indexed sequence to a stream.
Converts this mutable indexed sequence to a stream.
returns
a stream containing all elements of this mutable indexed sequence.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
IterableLike → TraversableLike → GenTraversableOnce
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 toTraversable: collection.Traversable[T]
Converts this mutable indexed sequence to an unspecified Traversable.
Converts this mutable indexed sequence to an unspecified Traversable. Will return the same collection if this instance is already Traversable.
returns
a Traversable containing all elements of this mutable indexed sequence.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
TraversableLike → TraversableOnce → GenTraversableOnce
Annotations
@deprecatedOverriding( message = ... , since = "2.11.0" )
def toVector: Vector[T]
Converts this mutable indexed sequence to a Vector.
Converts this mutable indexed sequence to a Vector.
returns
a vector containing all elements of this mutable indexed sequence.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
TraversableOnce → GenTraversableOnce
def transpose[U](implicit asArray: (T) ⇒ Array[U]): Array[Array[U]]
Transposes a two dimensional array.
Transposes a two dimensional array.
U
Type of row elements.
asArray
A function that converts elements of this array to rows - arrays of type U.
returns
An array obtained by replacing elements of this arrays with rows the represent.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
ArrayOps
def union(that: collection.Seq[T]): Array[T]
[use case] Produces a new sequence which contains all elements of this array and also all elements of a given sequence.
[use case]
Produces a new sequence which contains all elements of this array and also all elements of a given sequence. xs union ys is equivalent to xs ++ ys.
Another way to express this is that xs union ys computes the order-preserving multi-set union of xs and ys. union is hence a counter-part of diff and intersect which also work on multi-sets.
that
the sequence to add.
returns
a new array which contains all elements of this array followed by all elements of that.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
SeqLike → GenSeqLike
Full Signature
def union[B >: A, That](that: GenSeq[B])(implicit bf: CanBuildFrom[Array[T], B, That]): That
def unzip[T1, T2](implicit asPair: (T) ⇒ (T1, T2), ct1: ClassTag[T1], ct2: ClassTag[T2]): (Array[T1], Array[T2])
Converts an array of pairs into an array of first elements and an array of second elements.
Converts an array of pairs into an array of first elements and an array of second elements.
T1
the type of the first half of the element pairs
T2
the type of the second half of the element pairs
asPair
an implicit conversion which asserts that the element type of this Array is a pair.
ct1
a class tag for T1 type parameter that is required to create an instance of Array[T1]
ct2
a class tag for T2 type parameter that is required to create an instance of Array[T2]
returns
a pair of Arrays, containing, respectively, the first and second half of each element pair of this Array.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
ArrayOps
def unzip3[T1, T2, T3](implicit asTriple: (T) ⇒ (T1, T2, T3), ct1: ClassTag[T1], ct2: ClassTag[T2], ct3: ClassTag[T3]): (Array[T1], Array[T2], Array[T3])
Converts an array of triples into three arrays, one containing the elements from each position of the triple.
Converts an array of triples into three arrays, one containing the elements from each position of the triple.
T1
the type of the first of three elements in the triple
T2
the type of the second of three elements in the triple
T3
the type of the third of three elements in the triple
asTriple
an implicit conversion which asserts that the element type of this Array is a triple.
ct1
a class tag for T1 type parameter that is required to create an instance of Array[T1]
ct2
a class tag for T2 type parameter that is required to create an instance of Array[T2]
ct3
a class tag for T3 type parameter that is required to create an instance of Array[T3]
returns
a triple of Arrays, containing, respectively, the first, second, and third elements from each element triple of this Array.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
ArrayOps
def update(i: Int, x: T): Unit
Update the element at given index.
Update the element at given index.
Indices start at 0; xs.update(i, x) replaces the i^th element in the array. Note the syntax xs(i) = x is a shorthand for xs.update(i, x).
i
the index
x
the value to be written at index i

Exceptions thrown
ArrayIndexOutOfBoundsException if i < 0 or length <= i
def updated(index: Int, elem: A): Array[A]
[use case] A copy of this array with one single replaced element.
[use case]
A copy of this array with one single replaced element.
index
the position of the replacement
elem
the replacing element
returns
a copy of this array with the element at position index replaced by elem.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
SeqLike → GenSeqLike
Full Signature
def updated[B >: A, That](index: Int, elem: B)(implicit bf: CanBuildFrom[Array[T], B, That]): That
def view(from: Int, until: Int): IndexedSeqView[T, Array[T]]
A sub-sequence view starting at index from and extending up to (but not including) index until.
A sub-sequence view starting at index from and extending up to (but not including) index until.
from
The index of the first element of the slice
until
The index of the element following the slice
returns
a non-strict view of a slice of this mutable indexed sequence, starting at index from and extending up to (but not including) index until.@note The difference between view and slice is that view produces a view of the current sequence, whereas slice produces a new sequence.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
IndexedSeqLike → SeqLike → IterableLike → TraversableLike
Note
view(from, to) is equivalent to view.slice(from, to)
def view: IndexedSeqView[T, Array[T]]
Creates a view of this iterable @see Iterable.View
Creates a view of this iterable @see Iterable.View
returns
a non-strict view of this mutable indexed sequence.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
IndexedSeqLike → SeqLike → IterableLike → TraversableLike
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

Definition Classes
AnyRef
Annotations
@throws( ... ) @native()
def withFilter(p: (T) ⇒ Boolean): FilterMonadic[T, Array[T]]
Creates a non-strict filter of this mutable indexed sequence.
Creates a non-strict filter of this mutable indexed sequence.
Note: the difference between c filter p and c withFilter p is that the former creates a new collection, whereas the latter only restricts the domain of subsequent map, flatMap, foreach, and withFilter operations.
p
the predicate used to test elements.
returns
an object of class WithFilter, which supports map, flatMap, foreach, and withFilter operations. All these operations apply to those elements of this mutable indexed sequence which satisfy the predicate p.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
TraversableLike → FilterMonadic
def zip[B](that: GenIterable[B]): Array[(A, B)]
[use case] Returns a array formed from this array and another iterable collection by combining corresponding elements in pairs.
[use case]
Returns a array formed from this array and another iterable collection by combining corresponding elements in pairs. If one of the two collections is longer than the other, its remaining elements are ignored.
B
the type of the second half of the returned pairs
that
The iterable providing the second half of each result pair
returns
a new array containing pairs consisting of corresponding elements of this array and that. The length of the returned collection is the minimum of the lengths of this array and that.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
IndexedSeqOptimized → IterableLike → GenIterableLike
Full Signature
def zip[A1 >: A, B, That](that: GenIterable[B])(implicit bf: CanBuildFrom[Array[T], (A1, B), That]): That
def zipAll[B](that: collection.Iterable[B], thisElem: A, thatElem: B): Array[(A, B)]
[use case] Returns a array formed from this array and another iterable collection by combining corresponding elements in pairs.
[use case]
Returns a array formed from this array and another iterable collection by combining corresponding elements in pairs. If one of the two collections is shorter than the other, placeholder elements are used to extend the shorter collection to the length of the longer.
B
the type of the second half of the returned pairs
that
The iterable providing the second half of each result pair
thisElem
the element to be used to fill up the result if this array is shorter than that.
thatElem
the element to be used to fill up the result if that is shorter than this array.
returns
a new array containing pairs consisting of corresponding elements of this array and that. The length of the returned collection is the maximum of the lengths of this array and that. If this array is shorter than that, thisElem values are used to pad the result. If that is shorter than this array, thatElem values are used to pad the result.

Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
IterableLike → GenIterableLike
Full Signature
def zipAll[B, A1 >: A, That](that: GenIterable[B], thisElem: A1, thatElem: B)(implicit bf: CanBuildFrom[Array[T], (A1, B), That]): That
def zipWithIndex: Array[(A, Int)]
[use case] Zips this array with its indices.
[use case]
Zips this array with its indices.
returns
A new array containing pairs consisting of all elements of this array paired with their index. Indices start at 0.
Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
IndexedSeqOptimized → IterableLike → GenIterableLike
Full Signature
def zipWithIndex[A1 >: A, That](implicit bf: CanBuildFrom[Array[T], (A1, Int), That]): That
Example:
1. List("a", "b", "c").zipWithIndex = List(("a", 0), ("b", 1), ("c", 2))
def →[B](y: B): (Array[T], B)

Implicit
This member is added by an implicit conversion from Array[T] to ArrowAssoc[Array[T]] performed by method ArrowAssoc in scala.Predef.
Definition Classes
ArrowAssoc

Shadowed Implicit Value Members

def apply(idx: Int): T
Selects an element by its index in the mutable indexed sequence.
Selects an element by its index in the mutable indexed sequence.
Example:
```
scala> val x = List(1, 2, 3, 4, 5)
x: List[Int] = List(1, 2, 3, 4, 5)

scala> x(3)
res1: Int = 4
```
idx
The index to select.
returns
the element of this mutable indexed sequence at index idx, where 0 indicates the first element.
Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps 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:
(array: ArrayOps[T]).apply(idx)
Definition Classes
SeqLike → GenSeqLike
Exceptions thrown
IndexOutOfBoundsException if idx does not satisfy 0 <= idx < length.
def equals(that: Any): Boolean
The equals method for arbitrary sequences.
The equals method for arbitrary sequences. Compares this sequence to some other object.
that
The object to compare the sequence to
returns
true if that is a sequence that has the same elements as this sequence in the same order, false otherwise
Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps 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:
(array: ArrayOps[T]).equals(that)
Definition Classes
GenSeqLike → Equals → Any
def hashCode(): Int
Hashcodes for Array produce a value from the hashcodes of all the elements of the mutable indexed sequence.
Hashcodes for Array produce a value from the hashcodes of all the elements of the mutable indexed sequence.
returns
the hash code value for this object.
Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps 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:
(array: ArrayOps[T]).hashCode()
Definition Classes
IndexedSeqLike → GenSeqLike → Any
def length: Int
The length of the mutable indexed sequence.
The length of the mutable indexed sequence.
Note: xs.length and xs.size yield the same result.
returns
the number of elements in this mutable indexed sequence.
Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps 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:
(array: ArrayOps[T]).length
Definition Classes
SeqLike → GenSeqLike
Exceptions thrown
IllegalArgumentException if the length of the sequence cannot be represented in an Int, for example, (-1 to Int.MaxValue).length.
def toString(): String
Converts this mutable indexed sequence to a string.
Converts this mutable indexed sequence to a string.
returns
a string representation of this collection. By default this string consists of the stringPrefix of this mutable indexed sequence, followed by all elements separated by commas and enclosed in parentheses.
Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps 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:
(array: ArrayOps[T]).toString()
Definition Classes
SeqLike → TraversableLike → Any
def update(idx: Int, elem: T): Unit
Replaces element at given index with a new value.
Replaces element at given index with a new value.
idx
the index of the element to replace.
elem
the new value.
Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps 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:
(array: ArrayOps[T]).update(idx, elem)
Definition Classes
IndexedSeqLike
Exceptions thrown
IndexOutOfBoundsException if the index is not valid.

Deprecated Value Members

def /:[B](z: B)(op: (B, T) ⇒ B): B
Applies a binary operator to a start value and all elements of this mutable indexed sequence, going left to right.
Applies a binary operator to a start value and all elements of this mutable indexed sequence, going left to right.
Note: /: is alternate syntax for foldLeft; z /: xs is the same as xs foldLeft z.
Examples:
Note that the folding function used to compute b is equivalent to that used to compute c.
```
scala> val a = List(1,2,3,4)
a: List[Int] = List(1, 2, 3, 4)

scala> val b = (5 /: a)(_+_)
b: Int = 15

scala> val c = (5 /: a)((x,y) => x + y)
c: Int = 15
```
B
the result type of the binary operator.
z
the start value.
op
the binary operator.
returns
the result of inserting op between consecutive elements of this mutable indexed sequence, going left to right with the start value z on the left:
```
op(...op(op(z, x_1), x_2), ..., x_n)
```
where x₁, ..., x_n are the elements of this mutable indexed sequence.
Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
TraversableOnce → GenTraversableOnce
Annotations
@deprecated
Deprecated
(Since version 2.12.10) Use foldLeft instead of /:
def :\[B](z: B)(op: (T, B) ⇒ B): B
Applies a binary operator to all elements of this mutable indexed sequence and a start value, going right to left.
Applies a binary operator to all elements of this mutable indexed sequence and a start value, going right to left.
Note: :\ is alternate syntax for foldRight; xs :\ z is the same as xs foldRight z.
Examples:
Note that the folding function used to compute b is equivalent to that used to compute c.
```
scala> val a = List(1,2,3,4)
a: List[Int] = List(1, 2, 3, 4)

scala> val b = (a :\ 5)(_+_)
b: Int = 15

scala> val c = (a :\ 5)((x,y) => x + y)
c: Int = 15
```
B
the result type of the binary operator.
z
the start value
op
the binary operator
returns
the result of inserting op between consecutive elements of this mutable indexed sequence, going right to left with the start value z on the right:
```
op(x_1, op(x_2, ... op(x_n, z)...))
```
where x₁, ..., x_n are the elements of this mutable indexed sequence.
Implicit
This member is added by an implicit conversion from Array[T] to ArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
TraversableOnce → GenTraversableOnce
Annotations
@deprecated
Deprecated
(Since version 2.12.10) Use foldRight instead of :\
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 for String.format (@see java.lang.String.format).

Implicit
This member is added by an implicit conversion from Array[T] to StringFormat[Array[T]] performed by method StringFormat in scala.Predef.
Definition Classes
StringFormat
Annotations
@deprecated @inline()
Deprecated
(Since version 2.12.16) Use formatString.format(value) instead of value.formatted(formatString), or use the f"" string interpolator. In Java 15 and later, formatted resolves to the new method in String which has reversed parameters.

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Array 

Companion object Array

final class Array[T] extends java.io.Serializable with java.lang.Cloneable

Instance Constructors

Value Members

def ++:[B >: A, That](that: collection.TraversableOnce[B])(implicit bf: CanBuildFrom[Array[T], B, That]): That

def +:[B >: A, That](elem: B)(implicit bf: CanBuildFrom[Array[T], B, That]): That

def :+[B >: A, That](elem: B)(implicit bf: CanBuildFrom[Array[T], B, That]): That

def collect[B, That](pf: PartialFunction[T, B])(implicit bf: CanBuildFrom[Array[T], B, That]): That

def copyToArray[U >: T](xs: Array[U], start: Int, len: Int): Unit

def copyToArray[B >: A](xs: Array[B]): Unit

def copyToArray[B >: A](xs: Array[B], start: Int): Unit

def diff[B >: A](that: GenSeq[B]): Array[T]

def flatMap[B, That](f: (T) ⇒ GenTraversableOnce[B])(implicit bf: CanBuildFrom[Array[T], B, That]): That

def foreach[U](f: (T) ⇒ U): Unit

def indexOf[B >: A](elem: B, from: Int): Int

def indexOf[B >: A](elem: B): Int

def intersect[B >: A](that: GenSeq[B]): Array[T]

def lastIndexOf[B >: A](elem: B, end: Int): Int

def lastIndexOf[B >: A](elem: B): Int

def map[B, That](f: (T) ⇒ B)(implicit bf: CanBuildFrom[Array[T], B, That]): That

def max[B >: A](implicit cmp: Ordering[B]): T

def maxBy[B](f: (T) ⇒ B)(implicit cmp: Ordering[B]): T

def min[B >: A](implicit cmp: Ordering[B]): T

def minBy[B](f: (T) ⇒ B)(implicit cmp: Ordering[B]): T

def padTo[B >: A, That](len: Int, elem: B)(implicit bf: CanBuildFrom[Array[T], B, That]): That

def patch[B >: A, That](from: Int, patch: GenSeq[B], replaced: Int)(implicit bf: CanBuildFrom[Array[T], B, That]): That

def product[B >: A](implicit num: Numeric[B]): B

def reverseMap[B, That](f: (T) ⇒ B)(implicit bf: CanBuildFrom[Array[T], B, That]): That

def sameElements[B >: A](that: GenIterable[B]): Boolean

def sum[B >: A](implicit num: Numeric[B]): B

def to[Col[_]](implicit cbf: CanBuildFrom[Nothing, T, Col[T]]): Col[T]

def toArray[U >: T](implicit arg0: ClassTag[U]): Array[U]

def toMap[T, U](implicit ev: <:<[T, (T, U)]): Map[T, U]

def union[B >: A, That](that: GenSeq[B])(implicit bf: CanBuildFrom[Array[T], B, That]): That

def updated[B >: A, That](index: Int, elem: B)(implicit bf: CanBuildFrom[Array[T], B, That]): That

def zip[A1 >: A, B, That](that: GenIterable[B])(implicit bf: CanBuildFrom[Array[T], (A1, B), That]): That

def zipAll[B, A1 >: A, That](that: GenIterable[B], thisElem: A1, thatElem: B)(implicit bf: CanBuildFrom[Array[T], (A1, B), That]): That

def zipWithIndex[A1 >: A, That](implicit bf: CanBuildFrom[Array[T], (A1, Int), That]): That

Shadowed Implicit Value Members

Deprecated Value Members

Inherited from java.lang.Cloneable

Inherited from java.io.Serializable

Inherited from AnyRef

Inherited from Any

Inherited by implicit conversion genericArrayOps from Array[T] to ArrayOps[T]

Inherited by implicit conversion any2stringadd from Array[T] to any2stringadd[Array[T]]

Inherited by implicit conversion StringFormat from Array[T] to StringFormat[Array[T]]

Inherited by implicit conversion Ensuring from Array[T] to Ensuring[Array[T]]

Inherited by implicit conversion ArrowAssoc from Array[T] to ArrowAssoc[Array[T]]

Ungrouped

Array