Class scala.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.ArrayOps (shown on line 4 of the example above) and a conversion to scala.collection.mutable.ArraySeq (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 ArraySeq is permanent as all operations return a ArraySeq.

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

val arr = Array(1, 2, 3)
val arrReversed = arr.reverse
val seqReversed : collection.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 ArraySeq first and invoking the variant of reverse that returns another ArraySeq.

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

Instance Constructors

new Array(_length: Int)

Value Members

final def !=(arg0: Any): Boolean

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. 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] toany2stringadd[Array[T]] performed by method any2stringadd in scala.Predef.
Definition Classes
any2stringadd

final def ++[B >: A](xs: Array[_ <: B])(implicit arg0: ClassTag[B]): Array[B]

Implicit
This member is added by an implicit conversion from Array[T] toArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
ArrayOps
Annotations
@inline()

final def ++[B >: A](xs: collection.IterableOnce[B])(implicit arg0: ClassTag[B]): Array[B]

Implicit
This member is added by an implicit conversion from Array[T] toArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
ArrayOps
Annotations
@inline()

final def ++[B >: A](suffix: collection.IterableOnce[B]): collection.immutable.IndexedSeq[B]

Alias for concat

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
IterableOps
Annotations
@inline()

final def ++:[B >: A](prefix: Array[_ <: B])(implicit arg0: ClassTag[B]): Array[B]

Implicit
This member is added by an implicit conversion from Array[T] toArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
ArrayOps
Annotations
@inline()

final def ++:[B >: A](prefix: collection.IterableOnce[B])(implicit arg0: ClassTag[B]): Array[B]

Implicit
This member is added by an implicit conversion from Array[T] toArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
ArrayOps
Annotations
@inline()

final def ++:[B >: A](prefix: collection.IterableOnce[B]): collection.immutable.IndexedSeq[B]

Alias for prependedAll

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
SeqOpsIterableOps
Annotations
@inline()

final def +:[B >: A](x: B)(implicit arg0: ClassTag[B]): Array[B]

Implicit
This member is added by an implicit conversion from Array[T] toArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
ArrayOps
Annotations
@inline()

final def +:[B >: A](elem: B): collection.immutable.IndexedSeq[B]

Alias for prepended.

Note that :-ending operators are right associative (see example). A mnemonic for +: vs. :+ is: the COLon goes on the COLlection side.

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
SeqOps
Annotations
@inline()

def ->[B](y: B): (Array[T], B)

Implicit
This member is added by an implicit conversion from Array[T] toArrowAssoc[Array[T]] performed by method ArrowAssoc in scala.Predef.
Definition Classes
ArrowAssoc
Annotations
@inline()

final def :+[B >: A](x: B)(implicit arg0: ClassTag[B]): Array[B]

Implicit
This member is added by an implicit conversion from Array[T] toArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
ArrayOps
Annotations
@inline()

final def :+[B >: A](elem: B): collection.immutable.IndexedSeq[B]

Alias for appended

Note that :-ending operators are right associative (see example). A mnemonic for +: vs. :+ is: the COLon goes on the COLlection side.

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
SeqOps
Annotations
@inline()

final def :++[B >: A](suffix: Array[_ <: B])(implicit arg0: ClassTag[B]): Array[B]

Implicit
This member is added by an implicit conversion from Array[T] toArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
ArrayOps
Annotations
@inline()

final def :++[B >: A](suffix: collection.IterableOnce[B])(implicit arg0: ClassTag[B]): Array[B]

Implicit
This member is added by an implicit conversion from Array[T] toArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
ArrayOps
Annotations
@inline()

final def :++[B >: A](suffix: collection.IterableOnce[B]): collection.immutable.IndexedSeq[B]

Alias for appendedAll

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
SeqOps
Annotations
@inline()

final def ==(arg0: Any): Boolean

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

final def addString(b: collection.mutable.StringBuilder): collection.mutable.StringBuilder

Appends all elements of this immutable sequence to a string builder. The written text consists of the string representations (w.r.t. the method toString) of all elements of this immutable 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] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
IterableOnceOps
Annotations
@inline()

final def addString(b: collection.mutable.StringBuilder, sep: String): collection.mutable.StringBuilder

Appends all elements of this immutable 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 immutable 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] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
IterableOnceOps
Annotations
@inline()

def addString(b: collection.mutable.StringBuilder, start: String, sep: String, end: String): collection.mutable.StringBuilder

Appends all elements of this immutable 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 immutable 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] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
IterableOnceOps

def andThen[C](k: PartialFunction[T, C]): PartialFunction[Int, C]

Composes this partial function with another partial function that gets applied to results of this partial function.

Note that calling isDefinedAt on the resulting partial function may apply the first partial function and execute its side effect. It is highly recommended to call applyOrElse instead of isDefinedAt / apply for efficiency.

C

the result type of the transformation function.

k

the transformation function

returns

a partial function with the domain of this partial function narrowed by other partial function, which maps arguments x to k(this(x)).

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
PartialFunction

def andThen[C](k: (T) => C): PartialFunction[Int, C]

Composes this partial function with a transformation function that gets applied to results of this partial function.

If the runtime type of the function is a PartialFunction then the other andThen method is used (note its cautions).

C

the result type of the transformation function.

k

the transformation function

returns

a partial function with the domain of this partial function, possibly narrowed by the specified function, which maps arguments x to k(this(x)).

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
PartialFunctionFunction1

def appended[B >: A](x: B)(implicit arg0: ClassTag[B]): Array[B]

A copy of this array with an element appended.

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

def appended[B >: A](elem: B): collection.immutable.IndexedSeq[B]

A copy of this immutable sequence with an element appended.

Note: will not terminate for infinite-sized collections.

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)
B

the element type of the returned immutable sequence.

elem

the appended element

returns

a new immutable sequence consisting of all elements of this immutable sequence followed by value.

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
SeqOps

def appendedAll[B >: A](suffix: Array[_ <: B])(implicit arg0: ClassTag[B]): Array[B]

A copy of this array with all elements of an array appended.

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

def appendedAll[B >: A](suffix: collection.IterableOnce[B])(implicit arg0: ClassTag[B]): Array[B]

A copy of this array with all elements of a collection appended.

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

def appendedAll[B >: A](suffix: collection.IterableOnce[B]): collection.immutable.IndexedSeq[B]

Returns a new immutable sequence containing the elements from the left hand operand followed by the elements from the right hand operand. The element type of the immutable sequence is the most specific superclass encompassing the element types of the two operands.

B

the element type of the returned collection.

suffix

the iterable to append.

returns

a new collection of type CC[B] which contains all elements of this immutable sequence followed by all elements of suffix.

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
SeqOps

def apply(i: Int): T

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

def applyOrElse[A1 <: A, B1 >: B](x: A1, default: (A1) => B1): B1

Applies this partial function to the given argument when it is contained in the function domain. Applies fallback function where this partial function is not defined.

Note that expression pf.applyOrElse(x, default) is equivalent to

if(pf isDefinedAt x) pf(x) else default(x)

except that applyOrElse method can be implemented more efficiently. For all partial function literals the compiler generates an applyOrElse implementation which avoids double evaluation of pattern matchers and guards. This makes applyOrElse the basis for the efficient implementation for many operations and scenarios, such as:

    combining partial functions into orElse/andThen chains does not lead to excessive apply/isDefinedAt evaluation lift and unlift do not evaluate source functions twice on each invocation runWith allows efficient imperative-style combining of partial functions with conditionally applied actions

For non-literal partial function classes with nontrivial isDefinedAt method it is recommended to override applyOrElse with custom implementation that avoids double isDefinedAt evaluation. This may result in better performance and more predictable behavior w.r.t. side effects.

x

the function argument

default

the fallback function

returns

the result of this function or fallback function application.

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
PartialFunction
Since

2.10

final def asInstanceOf[T0]: 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.

that

The object with which this immutable sequence should be compared

returns

true, if this immutable 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] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
IndexedSeqSeqEquals

def charAt(index: Int): Char

Implicit
This member is added by an implicit conversion from Array[T] toArrayCharSequence performed by method ArrayCharSequence in scala.Predef.This conversion will take place only if T is Char (T =:= Char).
Definition Classes
ArrayCharSequence → CharSequence

def chars(): IntStream

Implicit
This member is added by an implicit conversion from Array[T] toArrayCharSequence performed by method ArrayCharSequence in scala.Predef.This conversion will take place only if T is Char (T =:= Char).
Definition Classes
CharSequence

def clone(): Array[T]

Clone the Array.

returns

A clone of the Array.

Definition Classes
Array → AnyRef

def codePoints(): IntStream

Implicit
This member is added by an implicit conversion from Array[T] toArrayCharSequence performed by method ArrayCharSequence in scala.Predef.This conversion will take place only if T is Char (T =:= Char).
Definition Classes
CharSequence

def collect[B](pf: PartialFunction[T, B])(implicit arg0: ClassTag[B]): Array[B]

Builds a new array by applying a partial function to all elements of this array on which the function is defined.

B

the element type of the returned array.

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] toArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
ArrayOps

def collect[B](pf: PartialFunction[T, B]): collection.immutable.IndexedSeq[B]

Builds a new immutable sequence by applying a partial function to all elements of this immutable sequence on which the function is defined.

B

the element type of the returned immutable sequence.

pf

the partial function which filters and maps the immutable sequence.

returns

a new immutable sequence 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] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
IterableOpsIterableOnceOps
Note

Reuse: After calling this method, one should discard the iterator it was called on, and use only the iterator that was returned. Using the old iterator is undefined, subject to change, and may result in changes to the new iterator as well.

def collectFirst[B](f: PartialFunction[T, B]): Option[B]

Finds the first element of the array for which the given partial function is defined, and applies the partial function to it.

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

def collectFirst[B](pf: PartialFunction[T, B]): Option[B]

Finds the first element of the immutable sequence for which the given partial function is defined, and applies the partial function to it.

Note: may not terminate for infinite-sized collections.

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] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
IterableOnceOps
Example:

    Seq("a", 1, 5L).collectFirst({ case x: Int => x*10 }) = Some(10)

def compose[R](k: PartialFunction[R, Int]): PartialFunction[R, T]

Composes another partial function k with this partial function so that this partial function gets applied to results of k.

Note that calling isDefinedAt on the resulting partial function may apply the first partial function and execute its side effect. It is highly recommended to call applyOrElse instead of isDefinedAt / apply for efficiency.

R

the parameter type of the transformation function.

k

the transformation function

returns

a partial function with the domain of other partial function narrowed by this partial function, which maps arguments x to this(k(x)).

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
PartialFunction

def compose[A](g: (A) => Int): (A) => T

Composes two instances of Function1 in a new Function1, with this function applied last.

A

the type to which function g can be applied

g

a function A => T1

returns

a new function f such that f(x) == apply(g(x))

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
Function1
Annotations
@unspecialized()

final def concat[B >: A](suffix: Array[_ <: B])(implicit arg0: ClassTag[B]): Array[B]

Implicit
This member is added by an implicit conversion from Array[T] toArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
ArrayOps
Annotations
@inline()

final def concat[B >: A](suffix: collection.IterableOnce[B])(implicit arg0: ClassTag[B]): Array[B]

Implicit
This member is added by an implicit conversion from Array[T] toArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
ArrayOps
Annotations
@inline()

final def concat[B >: A](suffix: collection.IterableOnce[B]): collection.immutable.IndexedSeq[B]

Returns a new immutable sequence containing the elements from the left hand operand followed by the elements from the right hand operand. The element type of the immutable sequence is the most specific superclass encompassing the element types of the two operands.

B

the element type of the returned collection.

suffix

the traversable to append.

returns

a new immutable sequence which contains all elements of this immutable sequence followed by all elements of suffix.

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
SeqOpsIterableOps
Annotations
@inline()

def containsSlice[B](that: collection.Seq[B]): Boolean

Tests whether this immutable sequence contains a given sequence as a slice.

Note: may not terminate for infinite-sized collections.

that

the sequence to test

returns

true if this immutable sequence contains a slice with the same elements as that, otherwise false.

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
SeqOps

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

Copy elements of this array to another array. Fills the given array xs starting at index start with at most len values. Copying will stop once either all the elements of this array have been copied, or the end of the array is reached, or len elements have been copied.

B

the type of the elements of the array.

xs

the array to fill.

start

the starting index within the destination array.

len

the maximal number of elements to copy.

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

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

Copy elements of this array to another array. Fills the given array xs starting at index start. Copying will stop once either all the elements of this array have been copied, or the end of the array is reached.

B

the type of the elements of the array.

xs

the array to fill.

start

the starting index within the destination array.

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

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

Copy elements of this array to another array. Fills the given array xs starting at index 0. Copying will stop once either all the elements of this array have been copied, or the end of the array is reached.

B

the type of the elements of the array.

xs

the array to fill.

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

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

Copy elements to an array, returning the number of elements written.

Fills the given array xs starting at index start with at most len elements of this immutable sequence.

Copying will stop once either all the elements of this immutable sequence have been copied, or the end of the array is reached, or len elements have been copied.

B

the type of the elements of the array.

xs

the array to fill.

start

the starting index of xs.

len

the maximal number of elements to copy.

returns

the number of elements written to the array

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
IterableOnceOps
Note

Reuse: After calling this method, one should discard the iterator it was called on. Using it is undefined and subject to change. Note: will not terminate for infinite-sized collections.

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

Copy elements to an array, returning the number of elements written.

Fills the given array xs starting at index start with values of this immutable sequence.

Copying will stop once either all the elements of this immutable sequence have been copied, or the end of the array is reached.

B

the type of the elements of the array.

xs

the array to fill.

start

the starting index of xs.

returns

the number of elements written to the array Note: will not terminate for infinite-sized collections.

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
IterableOnceOps

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

Copy elements to an array, returning the number of elements written.

Fills the given array xs starting at index start with values of this immutable sequence.

Copying will stop once either all the elements of this immutable sequence have been copied, or the end of the array is reached.

B

the type of the elements of the array.

xs

the array to fill.

returns

the number of elements written to the array Note: will not terminate for infinite-sized collections.

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
IterableOnceOps

def corresponds[B](that: collection.Seq[B])(p: (T, B) => Boolean): Boolean

Tests whether every element of this immutable 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 immutable sequence and y of that, otherwise false.

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
SeqOps

def corresponds[B](that: collection.IterableOnce[B])(p: (T, B) => Boolean): Boolean

Tests whether every element of this collection's iterator relates to the corresponding element of another collection by satisfying a test predicate.

B

the type of the elements of that

that

the other collection

p

the test predicate, which relates elements from both collections

returns

true if both collections have the same length and p(x, y) is true for all corresponding elements x of this iterator and y of that, otherwise false

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
IterableOnceOps

def diff[B >: A](that: collection.Seq[B]): Array[T]

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] toArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
ArrayOps

def diff[B >: A](that: collection.Seq[B]): collection.immutable.IndexedSeq[T]

Computes the multiset difference between this immutable sequence and another sequence.

that

the sequence of elements to remove

returns

a new immutable sequence which contains all elements of this immutable sequence 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] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
SeqOps

def distinctBy[B](f: (T) => B): Array[T]

Selects all the elements of this array ignoring the duplicates as determined by == after applying the transforming function f.

B

the type of the elements after being transformed by f

f

The transforming function whose result is used to determine the uniqueness of each element

returns

a new array consisting of all the elements of this array without duplicates.

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

def distinctBy[B](f: (T) => B): collection.immutable.IndexedSeq[T]

Selects all the elements of this immutable sequence ignoring the duplicates as determined by == after applying the transforming function f.

B

the type of the elements after being transformed by f

f

The transforming function whose result is used to determine the uniqueness of each element

returns

a new immutable sequence consisting of all the elements of this immutable sequence without duplicates.

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
SeqOps

def elementWise: ElementWiseExtractor[Int, T]

Returns an extractor object with a unapplySeq method, which extracts each element of a sequence data.

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
PartialFunction
Example:
    val firstChar: String => Option[Char] = _.headOption
    
    Seq("foo", "bar", "baz") match {
      case firstChar.unlift.elementWise(c0, c1, c2) =>
        println(s"$c0, $c1, $c2") // Output: f, b, b
    }

def empty: collection.immutable.IndexedSeq[T]

The empty iterable of the same type as this iterable

returns

an empty iterable of type C.

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
IterableFactoryDefaultsIterableOps

def endsWith[B >: A](that: collection.Iterable[B]): Boolean

Tests whether this array ends with the given sequence.

that

the sequence to test

returns

true if this array has that as a suffix, false otherwise.

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

def endsWith[B >: A](that: Array[B]): Boolean

Tests whether this array ends with the given array.

that

the array to test

returns

true if this array has that as a suffix, false otherwise.

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

def endsWith[B >: A](that: collection.Iterable[B]): Boolean

Tests whether this immutable sequence ends with the given sequence.

Note: will not terminate for infinite-sized collections.

that

the sequence to test

returns

true if this immutable sequence has that as a suffix, false otherwise.

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
SeqOps

def ensuring(cond: (Array[T]) => Boolean, msg: => Any): Array[T]

Implicit
This member is added by an implicit conversion from Array[T] toEnsuring[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] toEnsuring[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] toEnsuring[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] toEnsuring[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).

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: AnyRef): Boolean

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 finalize(): Unit

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[java.lang]
Definition Classes
AnyRef
Annotations
@throws(classOf[java.lang.Throwable])
Note

not specified by SLS as a member of AnyRef

def findLast(p: (T) => Boolean): Option[T]

Finds the last element of the immutable sequence satisfying a predicate, if any.

Note: will not terminate for infinite-sized collections.

p

the predicate used to test elements.

returns

an option value containing the last element in the immutable sequence that satisfies p, or None if none exists.

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
SeqOps

def flatMap[BS, B](f: (T) => BS)(implicit asIterable: (BS) => collection.Iterable[B], m: ClassTag[B]): Array[B]

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

def flatMap[B](f: (T) => collection.IterableOnce[B])(implicit arg0: ClassTag[B]): Array[B]

Builds a new array by applying a function to all elements of this array and using the elements of the resulting collections.

B

the element type of the returned array.

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] toArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
ArrayOps

def flatMap[B](f: (T) => collection.IterableOnce[B]): collection.immutable.IndexedSeq[B]

Builds a new immutable sequence by applying a function to all elements of this immutable sequence 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 immutable sequence. 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: String) => 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 immutable sequence resulting from applying the given collection-valued function f to each element of this immutable sequence and concatenating the results.

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
IterableOpsIterableOnceOps
Note

Reuse: After calling this method, one should discard the iterator it was called on, and use only the iterator that was returned. Using the old iterator is undefined, subject to change, and may result in changes to the new iterator as well.

def flatten[B](implicit asIterable: (T) => collection.IterableOnce[B], m: ClassTag[B]): Array[B]

Flattens a two-dimensional array by concatenating all its rows into a single array.

B

Type of row elements.

asIterable

A function that converts elements of this array to rows - Iterables of type B.

returns

An array obtained by concatenating rows of this array.

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

def flatten[B](implicit asIterable: (T) => collection.IterableOnce[B]): collection.immutable.IndexedSeq[B]

Converts this immutable sequence of traversable collections into a immutable sequence formed by the elements of these traversable collections.

The resulting collection's type will be guided by the type of immutable sequence. For example:

val xs = List(
           Set(1, 2, 3),
           Set(1, 2, 3)
         ).flatten
// xs == List(1, 2, 3, 1, 2, 3)

val ys = Set(
           List(1, 2, 3),
           List(3, 2, 1)
         ).flatten
// ys == Set(1, 2, 3)
B

the type of the elements of each traversable collection.

asIterable

an implicit conversion which asserts that the element type of this immutable sequence is a GenTraversable.

returns

a new immutable sequence resulting from concatenating all element immutable sequences.

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
IterableOpsIterableOnceOps
Note

Reuse: After calling this method, one should discard the iterator it was called on, and use only the iterator that was returned. Using the old iterator is undefined, subject to change, and may result in changes to the new iterator as well.

def fold[A1 >: A](z: A1)(op: (A1, A1) => A1): A1

Folds the elements of this array using the specified associative binary operator.

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, or z if this array is empty.

Implicit
This member is added by an implicit conversion from Array[T] toArrayOps[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 immutable sequence using the specified associative binary operator. The default implementation in IterableOnce is equivalent to foldLeft but may be overridden for more efficient traversal orders.

The order in which operations are performed on elements is unspecified and may be nondeterministic.

Note: will not terminate for infinite-sized collections.

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 immutable sequence is empty.

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
IterableOnceOps

def foldLeft[B](z: B)(op: (B, T) => B): B

Applies a binary operator to a start value and all elements of this array, 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 array, going left to right with the start value z on the left:

op(...op(z, x_1), x_2, ..., x_n)

where x1, ..., xn are the elements of this array. Returns z if this array is empty.

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

def foldLeft[B](z: B)(op: (B, T) => B): B

Applies a binary operator to a start value and all elements of this immutable sequence, going left to right.

Note: will not terminate for infinite-sized collections.

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 immutable sequence, going left to right with the start value z on the left:

op(...op(z, x_1), x_2, ..., x_n)

where x1, ..., xn are the elements of this immutable sequence. Returns z if this immutable sequence is empty.

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
IterableOnceOps

def foldRight[B](z: B)(op: (T, B) => B): B

Applies a binary operator to all elements of this array 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 array, going right to left with the start value z on the right:

op(x_1, op(x_2, ... op(x_n, z)...))

where x1, ..., xn are the elements of this array. Returns z if this array is empty.

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

def foldRight[B](z: B)(op: (T, B) => B): B

Applies a binary operator to all elements of this immutable sequence and a start value, going right to left.

Note: will not terminate for infinite-sized collections.

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 immutable 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, ..., xn are the elements of this immutable sequence. Returns z if this immutable sequence is empty.

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
IterableOnceOps

def foreach[U](f: (T) => U): Unit

Apply f to each element for its side effects. Note: [U] parameter needed to help scalac's type inference.

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

def foreach[U](f: (T) => U): Unit

Apply f to each element for its side effects Note: [U] parameter needed to help scalac's type inference.

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
IterableOnceOps

def formatted(fmtstr: String): 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] toStringFormat[Array[T]] performed by method StringFormat in scala.Predef.
Definition Classes
StringFormat
Annotations
@inline()

final def getClass(): Class[_ <: AnyRef]

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 array into a map of arrays according to some discriminator function.

K

the type of keys returned by the discriminator function.

f

the discriminator function.

returns

A map from keys to arrays such that the following invariant holds:

(xs groupBy f)(k) = xs filter (x => f(x) == k)

That is, every key k is bound to an array of those elements x for which f(x) equals k.

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

def groupBy[K](f: (T) => K): Map[K, collection.immutable.IndexedSeq[T]]

Partitions this immutable sequence into a map of immutable sequences according to some discriminator function.

Note: Even when applied to a view or a lazy collection it will always force the elements.

K

the type of keys returned by the discriminator function.

f

the discriminator function.

returns

A map from keys to immutable 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 immutable sequence of those elements x for which f(x) equals k.

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
IterableOps

def groupMap[K, B](key: (T) => K)(f: (T) => B)(implicit arg0: ClassTag[B]): Map[K, Array[B]]

Partitions this array into a map of arrays according to a discriminator function key. Each element in a group is transformed into a value of type B using the value function.

It is equivalent to groupBy(key).mapValues(_.map(f)), but more efficient.

case class User(name: String, age: Int)

def namesByAge(users: Array[User]): Map[Int, Array[String]] =
  users.groupMap(_.age)(_.name)
K

the type of keys returned by the discriminator function

B

the type of values returned by the transformation function

key

the discriminator function

f

the element transformation function

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

def groupMap[K, B](key: (T) => K)(f: (T) => B): Map[K, collection.immutable.IndexedSeq[B]]

Partitions this immutable sequence into a map of immutable sequences according to a discriminator function key. Each element in a group is transformed into a value of type B using the value function.

It is equivalent to groupBy(key).mapValues(_.map(f)), but more efficient.

case class User(name: String, age: Int)

def namesByAge(users: Seq[User]): Map[Int, Seq[String]] =
  users.groupMap(_.age)(_.name)

Note: Even when applied to a view or a lazy collection it will always force the elements.

K

the type of keys returned by the discriminator function

B

the type of values returned by the transformation function

key

the discriminator function

f

the element transformation function

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
IterableOps

def groupMapReduce[K, B](key: (T) => K)(f: (T) => B)(reduce: (B, B) => B): Map[K, B]

Partitions this immutable sequence into a map according to a discriminator function key. All the values that have the same discriminator are then transformed by the value function and then reduced into a single value with the reduce function.

It is equivalent to groupBy(key).mapValues(_.map(f).reduce(reduce)), but more efficient.

def occurrences[A](as: Seq[A]): Map[A, Int] =
  as.groupMapReduce(identity)(_ => 1)(_ + _)

Note: Even when applied to a view or a lazy collection it will always force the elements.

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
IterableOps

def hashCode(): Int

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

Finds index of first occurrence of some value in this immutable sequence.

B

the type of the element elem.

elem

the element value to search for.

returns

the index >= 0 of the first element of this immutable sequence 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] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
SeqOps
Annotations
@deprecatedOverriding("Override indexOf(elem, from) instead - indexOf(elem) calls indexOf(elem, 0)", "2.13.0")

def indexOfSlice[B >: A](that: collection.Seq[B]): Int

Finds first index where this immutable sequence contains a given sequence as a slice.

Note: may not terminate for infinite-sized collections.

that

the sequence to test

returns

the first index >= 0 such that the elements of this immutable 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] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
SeqOps
Annotations
@deprecatedOverriding("Override indexOfSlice(that, from) instead - indexOfSlice(that) calls indexOfSlice(that, 0)", "2.13.0")

def indexOfSlice[B >: A](that: collection.Seq[B], from: Int): Int

Finds first index after or at a start index where this immutable sequence contains a given sequence as a slice.

Note: may not terminate for infinite-sized collections.

that

the sequence to test

from

the start index

returns

the first index >= from such that the elements of this immutable 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] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
SeqOps

def indexWhere(p: (T) => Boolean): Int

Finds index of the first element satisfying some predicate.

Note: may not terminate for infinite-sized collections.

p

the predicate used to test elements.

returns

the index >= 0 of the first element of this immutable sequence that satisfies the predicate p, or -1, if none exists.

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
SeqOps
Annotations
@deprecatedOverriding("Override indexWhere(p, from) instead - indexWhere(p) calls indexWhere(p, 0)", "2.13.0")

def intersect[B >: A](that: collection.Seq[B]): Array[T]

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] toArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
ArrayOps

def intersect[B >: A](that: collection.Seq[B]): collection.immutable.IndexedSeq[T]

Computes the multiset intersection between this immutable sequence and another sequence.

that

the sequence of elements to intersect with.

returns

a new immutable sequence which contains all elements of this immutable sequence 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] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
SeqOps

def isDefinedAt(idx: Int): Boolean

Tests whether this immutable 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 immutable sequence contains an element at position idx, false otherwise.

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
SeqOps

final def isInstanceOf[T0]: Boolean

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

def isTraversableAgain: Boolean

Tests whether this immutable sequence can be repeatedly traversed. Always true for Iterables and false for Iterators unless overridden.

returns

true if it is repeatedly traversable, false otherwise.

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
IterableOpsIterableOnceOps

def iterableFactory: SeqFactory[collection.immutable.IndexedSeq]

The companion object of this immutable sequence, providing various factory methods.

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
IndexedSeqIndexedSeqSeqSeqIterableIterableIterableOps
Note

When implementing a custom collection type and refining CC to the new type, this method needs to be overridden to return a factory for the new type (the compiler will issue an error otherwise).

def lastIndexOfSlice[B >: A](that: collection.Seq[B]): Int

Finds last index where this immutable sequence contains a given sequence as a slice.

Note: will not terminate for infinite-sized collections.

that

the sequence to test

returns

the last index such that the elements of this immutable 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] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
SeqOps
Annotations
@deprecatedOverriding("Override lastIndexOfSlice(that, end) instead - lastIndexOfSlice(that) calls lastIndexOfSlice(that, Int.MaxValue)", "2.13.0")

def lastIndexOfSlice[B >: A](that: collection.Seq[B], end: Int): Int

Finds last index before or at a given end index where this immutable sequence contains a given sequence as a slice.

Note: will not terminate for infinite-sized collections.

that

the sequence to test

end

the end index

returns

the last index <= end such that the elements of this immutable 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] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
SeqOps

def lastIndexWhere(p: (T) => Boolean): Int

Finds index of last element satisfying some predicate.

Note: will not terminate for infinite-sized collections.

p

the predicate used to test elements.

returns

the index of the last element of this immutable sequence that satisfies the predicate p, or -1, if none exists.

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
SeqOps
Annotations
@deprecatedOverriding("Override lastIndexWhere(p, end) instead - lastIndexWhere(p) calls lastIndexWhere(p, Int.MaxValue)", "2.13.0")

def lazyZip[B](that: collection.Iterable[B]): LazyZip2[T, B, Array[T]]

Analogous to zip except that the elements in each collection are not consumed until a strict operation is invoked on the returned LazyZip2 decorator.

Calls to lazyZip can be chained to support higher arities (up to 4) without incurring the expense of constructing and deconstructing intermediary tuples.

val xs = List(1, 2, 3)
val res = (xs lazyZip xs lazyZip xs lazyZip xs).map((a, b, c, d) => a + b + c + d)
// res == List(4, 8, 12)
B

the type of the second element in each eventual pair

that

the iterable providing the second element of each eventual pair

returns

a decorator LazyZip2 that allows strict operations to be performed on the lazily evaluated pairs or chained calls to lazyZip. Implicit conversion to Iterable[(A, B)] is also supported.

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

def lazyZip[B]: ([B](that: Iterable[B])scala.collection.LazyZip2[T,B,_1.type]) forSome {val _1: collection.immutable.IndexedSeq[T]}

Analogous to zip except that the elements in each collection are not consumed until a strict operation is invoked on the returned LazyZip2 decorator.

Calls to lazyZip can be chained to support higher arities (up to 4) without incurring the expense of constructing and deconstructing intermediary tuples.

val xs = List(1, 2, 3)
val res = (xs lazyZip xs lazyZip xs lazyZip xs).map((a, b, c, d) => a + b + c + d)
// res == List(4, 8, 12)
B

the type of the second element in each eventual pair

returns

a decorator LazyZip2 that allows strict operations to be performed on the lazily evaluated pairs or chained calls to lazyZip. Implicit conversion to Iterable[(A, B)] is also supported.

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
Iterable

def length: Int

final def lengthCompare(that: collection.Iterable[_]): Int

Compares the length of this immutable sequence to the size of another Iterable.

that

the Iterable whose size is compared with this immutable sequence's length.

returns

A value x where

x <  0       if this.length <  that.size
x == 0       if this.length == that.size
x >  0       if this.length >  that.size

The method as implemented here does not call length or size directly; its running time is O(this.length min that.size) instead of O(this.length + that.size). The method should be overridden if computing size is cheap and knownSize returns -1.

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
IndexedSeqOpsSeqOps

def lift: (Int) => Option[T]

Turns this partial function into a plain function returning an Option result.

returns

a function that takes an argument x to Some(this(x)) if this is defined for x, and to None otherwise.

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
PartialFunction
See also

Function.unlift

def map[B](f: (T) => B)(implicit ct: ClassTag[B]): Array[B]

Builds a new array by applying a function to all elements of this array.

B

the element type of the returned array.

f

the function to apply to each element.

returns

a new aray 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] toArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
ArrayOps

def map[B](f: (T) => B): collection.immutable.IndexedSeq[B]

Builds a new immutable sequence by applying a function to all elements of this immutable sequence.

B

the element type of the returned immutable sequence.

f

the function to apply to each element.

returns

a new immutable sequence resulting from applying the given function f to each element of this immutable sequence and collecting the results.

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
IndexedSeqOpsIterableOpsIterableOnceOps
Note

Reuse: After calling this method, one should discard the iterator it was called on, and use only the iterator that was returned. Using the old iterator is undefined, subject to change, and may result in changes to the new iterator as well.

def mapInPlace(f: (T) => T): Array[T]

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

def max[B >: A](implicit ord: math.Ordering[B]): T

Finds the largest element.

B

The type over which the ordering is defined.

ord

An ordering to be used for comparing elements.

returns

the largest element of this immutable sequence with respect to the ordering ord.

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
IterableOnceOps
Exceptions thrown

UnsupportedOperationException if this immutable sequence is empty.

def maxBy[B](f: (T) => B)(implicit cmp: math.Ordering[B]): T

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.

cmp

An ordering to be used for comparing elements.

returns

the first element of this immutable sequence with the largest value measured by function f with respect to the ordering cmp.

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
IterableOnceOps
Exceptions thrown

UnsupportedOperationException if this immutable sequence is empty.

def maxByOption[B](f: (T) => B)(implicit cmp: math.Ordering[B]): Option[T]

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.

cmp

An ordering to be used for comparing elements.

returns

an option value containing the first element of this immutable sequence with the largest value measured by function f with respect to the ordering cmp.

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
IterableOnceOps

def maxOption[B >: A](implicit ord: math.Ordering[B]): Option[T]

Finds the largest element.

B

The type over which the ordering is defined.

ord

An ordering to be used for comparing elements.

returns

an option value containing the largest element of this immutable sequence with respect to the ordering ord.

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
IterableOnceOps

def min[B >: A](implicit ord: math.Ordering[B]): T

Finds the smallest element.

B

The type over which the ordering is defined.

ord

An ordering to be used for comparing elements.

returns

the smallest element of this immutable sequence with respect to the ordering ord.

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
IterableOnceOps
Exceptions thrown

UnsupportedOperationException if this immutable sequence is empty.

def minBy[B](f: (T) => B)(implicit cmp: math.Ordering[B]): T

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.

cmp

An ordering to be used for comparing elements.

returns

the first element of this immutable sequence with the smallest value measured by function f with respect to the ordering cmp.

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
IterableOnceOps
Exceptions thrown

UnsupportedOperationException if this immutable sequence is empty.

def minByOption[B](f: (T) => B)(implicit cmp: math.Ordering[B]): Option[T]

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.

cmp

An ordering to be used for comparing elements.

returns

an option value containing the first element of this immutable sequence with the smallest value measured by function f with respect to the ordering cmp.

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
IterableOnceOps

def minOption[B >: A](implicit ord: math.Ordering[B]): Option[T]

Finds the smallest element.

B

The type over which the ordering is defined.

ord

An ordering to be used for comparing elements.

returns

an option value containing the smallest element of this immutable sequence with respect to the ordering ord.

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
IterableOnceOps

final def mkString: String

Displays all elements of this immutable sequence in a string.

Delegates to addString, which can be overridden.

returns

a string representation of this immutable sequence. In the resulting string the string representations (w.r.t. the method toString) of all elements of this immutable sequence follow each other without any separator string.

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
IterableOnceOps
Annotations
@inline()

final def mkString(sep: String): String

Displays all elements of this immutable sequence in a string using a separator string.

Delegates to addString, which can be overridden.

sep

the separator string.

returns

a string representation of this immutable sequence. In the resulting string the string representations (w.r.t. the method toString) of all elements of this immutable sequence are separated by the string sep.

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
IterableOnceOps
Annotations
@inline()
Example:

    List(1, 2, 3).mkString("|") = "1|2|3"

final def mkString(start: String, sep: String, end: String): String

Displays all elements of this immutable sequence in a string using start, end, and separator strings.

Delegates to addString, which can be overridden.

start

the starting string.

sep

the separator string.

end

the ending string.

returns

a string representation of this immutable 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 immutable sequence are separated by the string sep.

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
IterableOnceOps
Example:

    List(1, 2, 3).mkString("(", "; ", ")") = "(1; 2; 3)"

final def ne(arg0: AnyRef): Boolean

Equivalent to !(this eq that).

returns

true if the argument is not a reference to the receiver object; false otherwise.

Definition Classes
AnyRef

final def notify(): Unit

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.

Definition Classes
AnyRef
Annotations
@native()
Note

not specified by SLS as a member of AnyRef

def orElse[A1 <: A, B1 >: B](that: PartialFunction[A1, B1]): PartialFunction[A1, B1]

Composes this partial function with a fallback partial function which gets applied where this partial function is not defined.

A1

the argument type of the fallback function

B1

the result type of the fallback function

that

the fallback function

returns

a partial function which has as domain the union of the domains of this partial function and that. The resulting partial function takes x to this(x) where this is defined, and to that(x) where it is not.

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
PartialFunction

def padTo[B >: A](len: Int, elem: B)(implicit arg0: ClassTag[B]): Array[B]

A copy of this array with an element value appended until a given target length is reached.

B

the element type of the returned array.

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 collection has a length of at least len.

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

def padTo[B >: A](len: Int, elem: B): collection.immutable.IndexedSeq[B]

A copy of this immutable sequence with an element value appended until a given target length is reached.

B

the element type of the returned immutable sequence.

len

the target length

elem

the padding value

returns

a new immutable sequence consisting of all elements of this immutable sequence followed by the minimal number of occurrences of elem so that the resulting collection has a length of at least len.

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
SeqOps

def partitionMap[A1, A2](f: (T) => Either[A1, A2])(implicit arg0: ClassTag[A1], arg1: ClassTag[A2]): (Array[A1], Array[A2])

Applies a function f to each element of the array and returns a pair of arrays: the first one made of those values returned by f that were wrapped in scala.util.Left, and the second one made of those wrapped in scala.util.Right.

Example:

val xs = Array(1, "one", 2, "two", 3, "three") partitionMap {
 case i: Int => Left(i)
 case s: String => Right(s)
}
// xs == (Array(1, 2, 3),
//        Array(one, two, three))
A1

the element type of the first resulting collection

A2

the element type of the second resulting collection

f

the 'split function' mapping the elements of this array to an scala.util.Either

returns

a pair of arrays: the first one made of those values returned by f that were wrapped in scala.util.Left, and the second one made of those wrapped in scala.util.Right.

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

def partitionMap[A1, A2](f: (T) => Either[A1, A2]): (collection.immutable.IndexedSeq[A1], collection.immutable.IndexedSeq[A2])

Applies a function f to each element of the immutable sequence and returns a pair of immutable sequences: the first one made of those values returned by f that were wrapped in scala.util.Left, and the second one made of those wrapped in scala.util.Right.

Example:

val xs = `immutable.Seq`(1, "one", 2, "two", 3, "three") partitionMap {
 case i: Int => Left(i)
 case s: String => Right(s)
}
// xs == (`immutable.Seq`(1, 2, 3),
//        `immutable.Seq`(one, two, three))
A1

the element type of the first resulting collection

A2

the element type of the second resulting collection

f

the 'split function' mapping the elements of this immutable sequence to an scala.util.Either

returns

a pair of immutable sequences: the first one made of those values returned by f that were wrapped in scala.util.Left, and the second one made of those wrapped in scala.util.Right.

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
IterableOps

def patch[B >: A](from: Int, other: collection.IterableOnce[B], replaced: Int)(implicit arg0: ClassTag[B]): Array[B]

Returns a copy of this array with patched values. Patching at negative indices is the same as patching starting at 0. Patching at indices at or larger than the length of the original array appends the patch to the end. If more values are replaced than actually exist, the excess is ignored.

from

The start index from which to patch

other

The patch values

replaced

The number of values in the original array that are replaced by the patch.

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

def patch[B >: A](from: Int, other: collection.IterableOnce[B], replaced: Int): collection.immutable.IndexedSeq[B]

Produces a new immutable sequence where a slice of elements in this immutable sequence is replaced by another sequence.

Patching at negative indices is the same as patching starting at 0. Patching at indices at or larger than the length of the original immutable sequence appends the patch to the end. If more values are replaced than actually exist, the excess is ignored.

B

the element type of the returned immutable sequence.

from

the index of the first replaced element

other

the replacement sequence

replaced

the number of elements to drop in the original immutable sequence

returns

a new immutable sequence consisting of all elements of this immutable sequence except that replaced elements starting from from are replaced by all the elements of other.

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
SeqOps

def prepended[B >: A](x: B)(implicit arg0: ClassTag[B]): Array[B]

A copy of this array with an element prepended.

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

def prepended[B >: A](elem: B): collection.immutable.IndexedSeq[B]

A copy of the immutable sequence with an element prepended.

Also, the original immutable sequence 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)
B

the element type of the returned immutable sequence.

elem

the prepended element

returns

a new immutable sequence consisting of value followed by all elements of this immutable sequence.

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
IndexedSeqOpsSeqOps

def prependedAll[B >: A](prefix: Array[_ <: B])(implicit arg0: ClassTag[B]): Array[B]

A copy of this array with all elements of an array prepended.

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

def prependedAll[B >: A](prefix: collection.IterableOnce[B])(implicit arg0: ClassTag[B]): Array[B]

A copy of this array with all elements of a collection prepended.

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

def prependedAll[B >: A](prefix: collection.IterableOnce[B]): collection.immutable.IndexedSeq[B]

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.

B

the element type of the returned collection.

prefix

the iterable to prepend.

returns

a new immutable sequence which contains all elements of prefix followed by all the elements of this immutable sequence.

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
SeqOps

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

Multiplies up the elements of this collection.

B

the result type of the * operator.

num

an implicit parameter defining a set of numeric operations which includes the * operator to be used in forming the product.

returns

the product of all elements of this immutable sequence with respect to the * operator in num.

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
IterableOnceOps

def reduce[B >: A](op: (B, B) => B): B

Reduces the elements of this immutable sequence using the specified associative binary operator.

The order in which operations are performed on elements is unspecified and may be nondeterministic.

B

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 immutable sequence is nonempty.

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
IterableOnceOps
Exceptions thrown

UnsupportedOperationException if this immutable sequence is empty.

def reduceLeft[B >: A](op: (B, T) => B): B

Applies a binary operator to all elements of this immutable sequence, going left to right.

Note: will not terminate for infinite-sized collections.

B

the result type of the binary operator.

op

the binary operator.

returns

the result of inserting op between consecutive elements of this immutable sequence, going left to right:

op( op( ... op(x_1, x_2) ..., x_{n-1}), x_n)

where x1, ..., xn are the elements of this immutable sequence.

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
IterableOnceOps
Exceptions thrown

UnsupportedOperationException if this immutable sequence is empty.

def reduceLeftOption[B >: A](op: (B, T) => B): Option[B]

Optionally applies a binary operator to all elements of this immutable sequence, going left to right.

Note: will not terminate for infinite-sized collections.

B

the result type of the binary operator.

op

the binary operator.

returns

an option value containing the result of reduceLeft(op) if this immutable sequence is nonempty, None otherwise.

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
IterableOnceOps

def reduceOption[B >: A](op: (B, B) => B): Option[B]

Reduces the elements of this immutable sequence, if any, using the specified associative binary operator.

The order in which operations are performed on elements is unspecified and may be nondeterministic.

B

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] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
IterableOnceOps

def reduceRight[B >: A](op: (T, B) => B): B

Applies a binary operator to all elements of this immutable sequence, going right to left.

Note: will not terminate for infinite-sized collections.

B

the result type of the binary operator.

op

the binary operator.

returns

the result of inserting op between consecutive elements of this immutable sequence, going right to left:

op(x_1, op(x_2, ..., op(x_{n-1}, x_n)...))

where x1, ..., xn are the elements of this immutable sequence.

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
IterableOnceOps
Exceptions thrown

UnsupportedOperationException if this immutable sequence is empty.

def reduceRightOption[B >: A](op: (T, B) => B): Option[B]

Optionally applies a binary operator to all elements of this immutable sequence, going right to left.

Note: will not terminate for infinite-sized collections.

B

the result type of the binary operator.

op

the binary operator.

returns

an option value containing the result of reduceRight(op) if this immutable sequence is nonempty, None otherwise.

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
IterableOnceOps

def runWith[U](action: (T) => U): (Int) => Boolean

Composes this partial function with an action function which gets applied to results of this partial function. The action function is invoked only for its side effects; its result is ignored.

Note that expression pf.runWith(action)(x) is equivalent to

if(pf isDefinedAt x) { action(pf(x)); true } else false

except that runWith is implemented via applyOrElse and thus potentially more efficient. Using runWith avoids double evaluation of pattern matchers and guards for partial function literals.

action

the action function

returns

a function which maps arguments x to isDefinedAt(x). The resulting function runs action(this(x)) where this is defined.

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
PartialFunction
Since

2.10

See also

applyOrElse.

def sameElements[B >: A](o: collection.IterableOnce[B]): Boolean

Are the elements of this collection the same (and in the same order) as those of that?

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
IndexedSeqSeqOps

def scan[B >: A](z: B)(op: (B, B) => B)(implicit arg0: ClassTag[B]): Array[B]

Computes a prefix scan of the elements of the array.

Note: The neutral element z may be applied more than once.

B

element type of the resulting array

z

neutral element for the operator op

op

the associative operator for the scan

returns

a new array containing the prefix scan of the elements in this array

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

def scan[B >: A](z: B)(op: (B, B) => B): collection.immutable.IndexedSeq[B]

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

z

neutral element for the operator op

op

the associative operator for the scan

returns

a new immutable sequence containing the prefix scan of the elements in this immutable sequence

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
IterableOps

def scanLeft[B](z: B)(op: (B, T) => B)(implicit arg0: ClassTag[B]): Array[B]

Produces an array containing cumulative results of applying the binary operator going left to right.

B

the result type of the binary operator.

z

the start value.

op

the binary operator.

returns

array with intermediate values. Example:

Array(1, 2, 3, 4).scanLeft(0)(_ + _) == Array(0, 1, 3, 6, 10)
Implicit
This member is added by an implicit conversion from Array[T] toArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
ArrayOps

def scanLeft[B](z: B)(op: (B, T) => B): collection.immutable.IndexedSeq[B]

Produces a immutable sequence containing cumulative results of applying the operator going left to right, including the initial value.

Note: will not terminate for infinite-sized collections.

B

the type of the elements in the resulting collection

z

the initial value

op

the binary operator applied to the intermediate result and the element

returns

collection with intermediate results

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
IterableOpsIterableOnceOps
Note

Reuse: After calling this method, one should discard the iterator it was called on, and use only the iterator that was returned. Using the old iterator is undefined, subject to change, and may result in changes to the new iterator as well.

def scanRight[B](z: B)(op: (T, B) => B)(implicit arg0: ClassTag[B]): Array[B]

Produces an array containing cumulative results of applying the binary operator going right to left.

B

the result type of the binary operator.

z

the start value.

op

the binary operator.

returns

array with intermediate values. Example:

Array(4, 3, 2, 1).scanRight(0)(_ + _) == Array(10, 6, 3, 1, 0)
Implicit
This member is added by an implicit conversion from Array[T] toArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
ArrayOps

def scanRight[B](z: B)(op: (T, B) => B): collection.immutable.IndexedSeq[B]

Produces a collection containing cumulative results of applying the operator going right to left. The head of the collection is the last cumulative result.

Note: will not terminate for infinite-sized collections.

Note: Even when applied to a view or a lazy collection it will always force the elements.

Example:

List(1, 2, 3, 4).scanRight(0)(_ + _) == List(10, 9, 7, 4, 0)
B

the type of the elements in the resulting collection

z

the initial value

op

the binary operator applied to the intermediate result and the element

returns

collection with intermediate results

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
IterableOps

Search within an interval in this sorted sequence for a specific element. If this sequence is an IndexedSeq, a binary search is used. Otherwise, a linear search is used.

The sequence should be sorted with the same Ordering before calling; otherwise, the results are undefined.

elem

the element to find.

from

the index where the search starts.

to

the index following where the search ends.

ord

the ordering to be used to compare elements.

returns

a Found value containing the index corresponding to the element in the sequence, or the InsertionPoint where the element would be inserted if the element is not in the sequence.

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
IndexedSeqOpsSeqOps
Note

if to <= from, the search space is empty, and an InsertionPoint at from is returned

See also

scala.collection.IndexedSeq

scala.math.Ordering

scala.collection.SeqOps, method sorted

Search this sorted sequence for a specific element. If the sequence is an IndexedSeq, a binary search is used. Otherwise, a linear search is used.

The sequence should be sorted with the same Ordering before calling; otherwise, the results are undefined.

elem

the element to find.

ord

the ordering to be used to compare elements.

returns

a Found value containing the index corresponding to the element in the sequence, or the InsertionPoint where the element would be inserted if the element is not in the sequence.

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
IndexedSeqOpsSeqOps
See also

scala.collection.IndexedSeq

scala.math.Ordering

scala.collection.SeqOps, method sorted

def segmentLength(p: (T) => Boolean, from: Int): Int

Computes length of longest segment whose elements all satisfy some predicate.

Note: may not terminate for infinite-sized collections.

p

the predicate used to test elements.

from

the index where the search starts.

returns

the length of the longest segment of this immutable 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] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
SeqOps

final def segmentLength(p: (T) => Boolean): Int

Computes length of longest segment whose elements all satisfy some predicate.

Note: may not terminate for infinite-sized collections.

p

the predicate used to test elements.

returns

the length of the longest segment of this immutable sequence such that every element of the segment satisfies the predicate p.

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
SeqOps

final def sizeCompare(that: collection.Iterable[_]): Int

Compares the size of this immutable sequence to the size of another Iterable.

that

the Iterable whose size is compared with this immutable sequence's size.

returns

A value x where

x <  0       if this.size <  that.size
x == 0       if this.size == that.size
x >  0       if this.size >  that.size

The method as implemented here does not call size directly; its running time is O(this.size min that.size) instead of O(this.size + that.size). The method should be overridden if computing size is cheap and knownSize returns -1.

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
SeqOpsIterableOps

def sliding(size: Int): collection.Iterator[collection.immutable.IndexedSeq[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.

size

the number of elements per group

returns

An iterator producing immutable 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] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
IterableOps
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.

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

an array consisting of the elements of this array 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] toArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
ArrayOps
See also

scala.math.Ordering

def sortBy[B](f: (T) => B)(implicit ord: Ordering[B]): collection.immutable.IndexedSeq[T]

Sorts this immutable sequence according to the Ordering which results from transforming an implicitly given Ordering with a transformation function.

Note: will not terminate for infinite-sized collections.

Note: Even when applied to a view or a lazy collection it will always force the elements.

The sort is stable. That is, elements that are equal (as determined by ord.compare) appear in the same order in the sorted sequence as in the original.

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 immutable sequence consisting of the elements of this immutable 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] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
SeqOps
Example:
    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 sorted[B >: A](implicit ord: math.Ordering[B]): Array[T]

Sorts this array 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

an array consisting of the elements of this array sorted according to the ordering ord.

Implicit
This member is added by an implicit conversion from Array[T] toArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
ArrayOps
See also

scala.math.Ordering

def sorted[B >: A](implicit ord: Ordering[B]): collection.immutable.IndexedSeq[T]

Sorts this immutable sequence according to an Ordering.

The sort is stable. That is, elements that are equal (as determined by ord.compare) appear in the same order in the sorted sequence as in the original.

ord

the ordering to be used to compare elements.

returns

a immutable sequence consisting of the elements of this immutable sequence sorted according to the ordering ord.

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
SeqOps
See also

scala.math.Ordering Note: Even when applied to a view or a lazy collection it will always force the elements.

def startsWith[B >: A](that: collection.IterableOnce[B], offset: Int = 0): Boolean

Tests whether this array contains the given sequence at a given index.

that

the sequence to test

offset

the index where the sequence is searched.

returns

true if the sequence that is contained in this array at index offset, otherwise false.

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

def startsWith[B >: A](that: Array[B], offset: Int): Boolean

Tests whether this array contains the given array at a given index.

that

the array to test

offset

the index where the array is searched.

returns

true if the array that is contained in this array at index offset, otherwise false.

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

def startsWith[B >: A](that: Array[B]): Boolean

Tests whether this array starts with the given array.

Implicit
This member is added by an implicit conversion from Array[T] toArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
ArrayOps
Annotations
@inline()

def startsWith[B >: A](that: collection.IterableOnce[B], offset: Int = 0): Boolean

Tests whether this immutable 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 immutable sequence at index offset, otherwise false.

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
SeqOps

def stepper[S <: Stepper[_]](implicit shape: StepperShape[T, S]): S with EfficientSplit

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

def stepper[S <: Stepper[_]](implicit shape: StepperShape[T, S]): S with EfficientSplit

Returns a Stepper for the elements of this collection.

The Stepper enables creating a Java stream to operate on the collection, see scala.jdk.StreamConverters. For collections holding primitive values, the Stepper can be used as an iterator which doesn't box the elements.

The implicit StepperShape parameter defines the resulting Stepper type according to the element type of this collection.

    For collections of Int, Short, Byte or Char, an IntStepper is returnedFor collections of Double or Float, a DoubleStepper is returnedFor collections of Long a LongStepper is returnedFor any other element type, an AnyStepper is returned

Note that this method is overridden in subclasses and the return type is refined to S with EfficientSplit, for example IndexedSeqOps.stepper. For Steppers marked with scala.collection.Stepper.EfficientSplit, the converters in scala.jdk.StreamConverters allow creating parallel streams, whereas bare Steppers can be converted only to sequential streams.

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
IndexedSeqOpsIterableOnce

def subSequence(start: Int, end: Int): CharSequence

Implicit
This member is added by an implicit conversion from Array[T] toArrayCharSequence performed by method ArrayCharSequence in scala.Predef.This conversion will take place only if T is Char (T =:= Char).
Definition Classes
ArrayCharSequence → CharSequence

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

Sums up the elements of this collection.

B

the result type of the + operator.

num

an implicit parameter defining a set of numeric operations which includes the + operator to be used in forming the sum.

returns

the sum of all elements of this immutable sequence with respect to the + operator in num.

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
IterableOnceOps

final def synchronized[T0](arg0: => T0): T0

Definition Classes
AnyRef

def tapEach[U](f: (T) => U): collection.immutable.IndexedSeq[T]

Applies a side-effecting function to each element in this collection. Strict collections will apply f to their elements immediately, while lazy collections like Views and LazyLists will only apply f on each element if and when that element is evaluated, and each time that element is evaluated.

U

the return type of f

f

a function to apply to each element in this immutable sequence

returns

The same logical collection as this

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
IterableOpsIterableOnceOps

def to[C1](factory: Factory[T, C1]): C1

Given a collection factory factory, convert this collection to the appropriate representation for the current element type A. Example uses:

xs.to(List) xs.to(ArrayBuffer) xs.to(BitSet) // for xs: Iterable[Int]

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
IterableOnceOps

def toArray[B >: A](implicit arg0: ClassTag[B]): Array[B]

Create a copy of this array with the specified element type.

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

def toArray[B >: A](implicit arg0: ClassTag[B]): Array[B]

Convert collection to array.

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
IterableOnceOps

final def toBuffer[B >: A]: Buffer[B]

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
IterableOnceOps
Annotations
@inline()

final def toIterable: collection.immutable.IndexedSeq[T]

returns

This collection as an Iterable[A]. No new collection will be built if this is already an Iterable[A].

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
IterableIterableOps

def toList: collection.immutable.List[T]

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
IterableOnceOps

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

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
IterableOnceOps

def toSet[B >: A]: Set[B]

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
IterableOnceOps

def toString(): String

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 toVector: collection.immutable.Vector[T]

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
IterableOnceOps

def transpose[B](implicit asArray: (T) => Array[B]): Array[Array[B]]

Transposes a two dimensional array.

B

Type of row elements.

asArray

A function that converts elements of this array to rows - arrays of type B.

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] toArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
ArrayOps

def transpose[B](implicit asIterable: (T) => collection.Iterable[B]): collection.immutable.IndexedSeq[collection.immutable.IndexedSeq[B]]

Transposes this immutable sequence of iterable collections into a immutable sequence of immutable sequences.

The resulting collection's type will be guided by the static type of immutable sequence. For example:

val xs = List(
           Set(1, 2, 3),
           Set(4, 5, 6)).transpose
// xs == List(
//         List(1, 4),
//         List(2, 5),
//         List(3, 6))

val ys = Vector(
           List(1, 2, 3),
           List(4, 5, 6)).transpose
// ys == Vector(
//         Vector(1, 4),
//         Vector(2, 5),
//         Vector(3, 6))

Note: Even when applied to a view or a lazy collection it will always force the elements.

B

the type of the elements of each iterable collection.

asIterable

an implicit conversion which asserts that the element type of this immutable sequence is an Iterable.

returns

a two-dimensional immutable sequence of immutable sequences which has as nth row the nth column of this immutable sequence.

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
IterableOps
Exceptions thrown

IllegalArgumentException if all collections in this immutable sequence are not of the same size.

def unapply(a: Int): Option[T]

Tries to extract a B from an A in a pattern matching expression.

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
PartialFunction

def unzip[A1, A2](implicit asPair: (T) => (A1, A2), ct1: ClassTag[A1], ct2: ClassTag[A2]): (Array[A1], Array[A2])

Converts an array of pairs into an array of first elements and an array of second elements.

A1

the type of the first half of the element pairs

A2

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 A1 type parameter that is required to create an instance of Array[A1]

ct2

a class tag for A2 type parameter that is required to create an instance of Array[A2]

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] toArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
ArrayOps

def unzip[A1, A2](implicit asPair: (T) => (A1, A2)): (collection.immutable.IndexedSeq[A1], collection.immutable.IndexedSeq[A2])

Converts this immutable sequence of pairs into two collections of the first and second half of each pair.

val xs = `immutable.Seq`(
           (1, "one"),
           (2, "two"),
           (3, "three")).unzip
// xs == (`immutable.Seq`(1, 2, 3),
//        `immutable.Seq`(one, two, three))
A1

the type of the first half of the element pairs

A2

the type of the second half of the element pairs

asPair

an implicit conversion which asserts that the element type of this immutable sequence is a pair.

returns

a pair of immutable sequences, containing the first, respectively second half of each element pair of this immutable sequence.

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
IterableOps

def unzip3[A1, A2, A3](implicit asTriple: (T) => (A1, A2, A3), ct1: ClassTag[A1], ct2: ClassTag[A2], ct3: ClassTag[A3]): (Array[A1], Array[A2], Array[A3])

Converts an array of triples into three arrays, one containing the elements from each position of the triple.

A1

the type of the first of three elements in the triple

A2

the type of the second of three elements in the triple

A3

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] toArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
ArrayOps

def unzip3[A1, A2, A3](implicit asTriple: (T) => (A1, A2, A3)): (collection.immutable.IndexedSeq[A1], collection.immutable.IndexedSeq[A2], collection.immutable.IndexedSeq[A3])

Converts this immutable sequence of triples into three collections of the first, second, and third element of each triple.

val xs = `immutable.Seq`(
           (1, "one", '1'),
           (2, "two", '2'),
           (3, "three", '3')).unzip3
// xs == (`immutable.Seq`(1, 2, 3),
//        `immutable.Seq`(one, two, three),
//        `immutable.Seq`(1, 2, 3))
A1

the type of the first member of the element triples

A2

the type of the second member of the element triples

A3

the type of the third member of the element triples

asTriple

an implicit conversion which asserts that the element type of this immutable sequence is a triple.

returns

a triple of immutable sequences, containing the first, second, respectively third member of each element triple of this immutable sequence.

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
IterableOps

def update(i: Int, x: T): Unit

Update the element at given index.

Indices start at 0; xs.update(i, x) replaces the ith 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[B >: A](index: Int, elem: B)(implicit arg0: ClassTag[B]): Array[B]

A copy of this array with one single replaced element.

index

the position of the replacement

elem

the replacing element

returns

a new array which is 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] toArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
ArrayOps
Exceptions thrown

IndexOutOfBoundsException if index does not satisfy 0 <= index < length.

def updated[B >: A](index: Int, elem: B): collection.immutable.IndexedSeq[B]

A copy of this immutable sequence with one single replaced element.

B

the element type of the returned immutable sequence.

index

the position of the replacement

elem

the replacing element

returns

a new immutable sequence which is a copy of this immutable sequence with the element at position index replaced by elem.

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
SeqOps
Exceptions thrown

IndexOutOfBoundsException if index does not satisfy 0 <= index < length. In case of a lazy collection this exception may be thrown at a later time or not at all (if the end of the collection is never evaluated).

final def wait(): Unit

Definition Classes
AnyRef
Annotations
@throws(classOf[java.lang.InterruptedException])

final def wait(arg0: Long, arg1: Int): Unit

Definition Classes
AnyRef
Annotations
@throws(classOf[java.lang.InterruptedException])

final def wait(arg0: Long): Unit

Definition Classes
AnyRef
Annotations
@throws(classOf[java.lang.InterruptedException]) @native()

def zip[B](that: collection.IterableOnce[B]): Array[(T, B)]

Returns an 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 array is the minimum of the lengths of this array and that.

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

def zip[B](that: collection.IterableOnce[B]): collection.immutable.IndexedSeq[(T, B)]

Returns a immutable sequence formed from this immutable sequence 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 immutable sequence containing pairs consisting of corresponding elements of this immutable sequence and that. The length of the returned collection is the minimum of the lengths of this immutable sequence and that.

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
IterableOps

def zipAll[A1 >: A, B](that: collection.Iterable[B], thisElem: A1, thatElem: B): Array[(A1, B)]

Returns an 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.

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 array 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] toArrayOps[T] performed by method genericArrayOps in scala.Predef.
Definition Classes
ArrayOps

def zipAll[A1 >: A, B](that: collection.Iterable[B], thisElem: A1, thatElem: B): collection.immutable.IndexedSeq[(A1, B)]

Returns a immutable sequence formed from this immutable sequence 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.

that

the iterable providing the second half of each result pair

thisElem

the element to be used to fill up the result if this immutable sequence is shorter than that.

thatElem

the element to be used to fill up the result if that is shorter than this immutable sequence.

returns

a new collection of type That containing pairs consisting of corresponding elements of this immutable sequence and that. The length of the returned collection is the maximum of the lengths of this immutable sequence and that. If this immutable sequence is shorter than that, thisElem values are used to pad the result. If that is shorter than this immutable sequence, thatElem values are used to pad the result.

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Definition Classes
IterableOps

Shadowed Implicit Value Members

def apply(i: Int): T

Get the element at the specified index. This operation is provided for convenience in Seq. It should not be assumed to be efficient unless you have an IndexedSeq.

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
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Definition Classes
SeqOps
Annotations
@throws(scala.this.throws.<init>$default$1[IndexOutOfBoundsException])

def combinations(n: Int): collection.Iterator[Array[T]]

Iterates over combinations. A _combination_ of length n is a subsequence of the original array, with the elements taken in order. Thus, Array("x", "y") and Array("y", "y") are both length-2 combinations of Array("x", "y", "y"), but Array("y", "x") is not. If there is more than one way to generate the same subsequence, only one will be returned.

For example, Array("x", "y", "y", "y") has three different ways to generate Array("x", "y") 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 array.

Implicit
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Definition Classes
ArrayOps
Example:
    Array("a", "b", "b", "b", "c").combinations(2) == Iterator(Array(a, b), Array(a, c), Array(b, b), Array(b, c))

def combinations(n: Int): collection.Iterator[collection.immutable.IndexedSeq[T]]

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.

Note: Even when applied to a view or a lazy collection it will always force the elements.

returns

An Iterator which traverses the possible n-element combinations of this immutable sequence.

Implicit
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Definition Classes
SeqOps
Example:

    "abbbc".combinations(2) = Iterator(ab, ac, bb, bc)

def contains(elem: T): Boolean

Tests whether this array contains a given value as an element.

elem

the element to test.

returns

true if this array has an element that is equal (as determined by ==) to elem, false otherwise.

Implicit
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Definition Classes
ArrayOps

def contains[A1 >: A](elem: A1): Boolean

Tests whether this immutable sequence contains a given value as an element.

Note: may not terminate for infinite-sized collections.

elem

the element to test.

returns

true if this immutable sequence has an element that is equal (as determined by ==) to elem, false otherwise.

Implicit
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Definition Classes
SeqOps

def count(p: (T) => Boolean): Int

Counts the number of elements in this array which satisfy a predicate

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Definition Classes
ArrayOps

def count(p: (T) => Boolean): Int

Counts the number of elements in the immutable sequence which satisfy a predicate.

p

the predicate used to test elements.

returns

the number of elements satisfying the predicate p.

Implicit
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Definition Classes
IterableOnceOps

def distinct: Array[T]

Selects all the elements of this array ignoring the duplicates.

returns

a new array consisting of all the elements of this array without duplicates.

Implicit
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Definition Classes
ArrayOps

def distinct: collection.immutable.IndexedSeq[T]

Selects all the elements of this immutable sequence ignoring the duplicates.

returns

a new immutable sequence consisting of all the elements of this immutable sequence without duplicates.

Implicit
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Definition Classes
SeqOps

def drop(n: Int): Array[T]

The rest of the array without its n first elements.

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Definition Classes
ArrayOps

def drop(n: Int): collection.immutable.IndexedSeq[T]

Selects all elements except first n ones.

n

the number of elements to drop from this immutable sequence.

returns

a immutable sequence consisting of all elements of this immutable sequence except the first n ones, or else the empty immutable sequence, if this immutable sequence has less than n elements. If n is negative, don't drop any elements.

Implicit
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Definition Classes
IndexedSeqOpsIterableOpsIterableOnceOps
Note

Reuse: After calling this method, one should discard the iterator it was called on, and use only the iterator that was returned. Using the old iterator is undefined, subject to change, and may result in changes to the new iterator as well.

def dropRight(n: Int): Array[T]

The rest of the array without its n last elements.

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Definition Classes
ArrayOps

def dropRight(n: Int): collection.immutable.IndexedSeq[T]

Selects all elements except last n ones.

n

the number of elements to drop from this immutable sequence.

returns

a immutable sequence consisting of all elements of this immutable sequence except the last n ones, or else the empty immutable sequence, if this immutable 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] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
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Definition Classes
IndexedSeqOpsIterableOps

def dropWhile(p: (T) => Boolean): Array[T]

Drops longest prefix of elements that satisfy a predicate.

p

The predicate used to test elements.

returns

the longest suffix of this array whose first element does not satisfy the predicate p.

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Definition Classes
ArrayOps

def dropWhile(p: (T) => Boolean): collection.immutable.IndexedSeq[T]

Drops longest prefix of elements that satisfy a predicate.

p

The predicate used to test elements.

returns

the longest suffix of this immutable sequence whose first element does not satisfy the predicate p.

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
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Definition Classes
IterableOpsIterableOnceOps
Note

Reuse: After calling this method, one should discard the iterator it was called on, and use only the iterator that was returned. Using the old iterator is undefined, subject to change, and may result in changes to the new iterator as well.

def equals(o: Any): Boolean

The universal equality method defined in AnyRef.

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
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Definition Classes
SeqEquals → AnyRef → Any

def exists(f: (T) => Boolean): Boolean

Tests whether a predicate holds for at least one element of this array.

returns

true if the given predicate p is satisfied by at least one element of this array, otherwise false

Implicit
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Definition Classes
ArrayOps

def exists(p: (T) => Boolean): Boolean

Tests whether a predicate holds for at least one element of this immutable sequence.

Note: may not terminate for infinite-sized collections.

p

the predicate used to test elements.

returns

true if the given predicate p is satisfied by at least one element of this immutable sequence, otherwise false

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
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Definition Classes
IterableOnceOps

def filter(p: (T) => Boolean): Array[T]

Selects all elements of this array which satisfy a predicate.

p

the predicate used to test elements.

returns

a new array consisting of all elements of this array that satisfy the given predicate p.

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

def filter(pred: (T) => Boolean): collection.immutable.IndexedSeq[T]

Selects all elements of this immutable sequence which satisfy a predicate.

returns

a new iterator consisting of all elements of this immutable 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] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
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Definition Classes
IterableOpsIterableOnceOps

def filterNot(p: (T) => Boolean): Array[T]

Selects all elements of this array which do not satisfy a predicate.

returns

a new array consisting of all elements of this array that do not satisfy the given predicate pred.

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

def filterNot(pred: (T) => Boolean): collection.immutable.IndexedSeq[T]

Selects all elements of this immutable sequence which do not satisfy a predicate.

pred

the predicate used to test elements.

returns

a new immutable sequence consisting of all elements of this immutable sequence that do not satisfy the given predicate pred. Their order may not be preserved.

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
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Definition Classes
IterableOpsIterableOnceOps

def find(f: (T) => Boolean): Option[T]

Finds the first element of the array satisfying a predicate, if any.

returns

an option value containing the first element in the array that satisfies p, or None if none exists.

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Definition Classes
ArrayOps

def find(p: (T) => Boolean): Option[T]

Finds the first element of the immutable sequence satisfying a predicate, if any.

Note: may not terminate for infinite-sized collections.

p

the predicate used to test elements.

returns

an option value containing the first element in the immutable sequence that satisfies p, or None if none exists.

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
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Definition Classes
IterableOnceOps

def forall(f: (T) => Boolean): Boolean

Tests whether a predicate holds for all elements of this array.

returns

true if this array is empty or the given predicate p holds for all elements of this array, otherwise false.

Implicit
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Definition Classes
ArrayOps

def forall(p: (T) => Boolean): Boolean

Tests whether a predicate holds for all elements of this immutable sequence.

Note: may not terminate for infinite-sized collections.

p

the predicate used to test elements.

returns

true if this immutable sequence is empty or the given predicate p holds for all elements of this immutable sequence, otherwise false.

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
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Definition Classes
IterableOnceOps

def grouped(size: Int): collection.Iterator[Array[T]]

Partitions elements in fixed size arrays.

size

the number of elements per group

returns

An iterator producing arrays of size size, except the last will be less than size size if the elements don't divide evenly.

Implicit
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Definition Classes
ArrayOps
See also

scala.collection.Iterator, method grouped

def grouped(size: Int): collection.Iterator[collection.immutable.IndexedSeq[T]]

Partitions elements in fixed size immutable sequences.

size

the number of elements per group

returns

An iterator producing immutable 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] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
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Definition Classes
IterableOps
See also

scala.collection.Iterator, method grouped

def hashCode(): Int

The hashCode method for reference types. See hashCode in scala.Any.

returns

the hash code value for this object.

Implicit
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Definition Classes
Seq → AnyRef → Any

Selects the first element of this array.

returns

the first element of this array.

Implicit
This member is added by an implicit conversion from Array[T] toArrayOps[T] performed by method genericArrayOps in scala.Predef.
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Definition Classes
ArrayOps
Exceptions thrown

NoSuchElementException if the array is empty.

Selects the first element of this immutable sequence.

returns

the first element of this immutable sequence.

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
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Definition Classes
IterableOps
Exceptions thrown

NoSuchElementException if the immutable sequence is empty.

def headOption: Option[T]

Optionally selects the first element.

returns

the first element of this array if it is nonempty, None if it is empty.

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Definition Classes
ArrayOps

def headOption: Option[T]

Optionally selects the first element.

returns

the first element of this immutable sequence if it is nonempty, None if it is empty.

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
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Definition Classes
IterableOps

def indexOf(elem: T, from: Int = 0): Int

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.

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Definition Classes
ArrayOps

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

Finds index of first occurrence of some value in this immutable sequence after or at some start index.

B

the type of the element elem.

elem

the element value to search for.

from

the start index

returns

the index >= from of the first element of this immutable sequence that is equal (as determined by ==) to elem, or -1, if none exists.

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Definition Classes
SeqOps

def indexWhere(f: (T) => Boolean, from: Int = 0): Int

Finds index of the first element satisfying some predicate after or at some start index.

from

the start index

returns

the index >= from of the first element of this array that satisfies the predicate p, or -1, if none exists.

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Definition Classes
ArrayOps

def indexWhere(p: (T) => Boolean, from: Int): Int

Finds index of the first element satisfying some predicate after or at some start index.

Note: may not terminate for infinite-sized collections.

p

the predicate used to test elements.

from

the start index

returns

the index >= from of the first element of this immutable sequence that satisfies the predicate p, or -1, if none exists.

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Definition Classes
SeqOps

def indices: collection.immutable.Range

Produces the range of all indices of this sequence.

returns

a Range value from 0 to one less than the length of this array.

Implicit
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Definition Classes
ArrayOps

def indices: collection.immutable.Range

Produces the range of all indices of this sequence.

Note: Even when applied to a view or a lazy collection it will always force the elements.

returns

a Range value from 0 to one less than the length of this immutable sequence.

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This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
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Definition Classes
SeqOps

def init: Array[T]

The initial part of the array without its last element.

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Definition Classes
ArrayOps

def init: collection.immutable.IndexedSeq[T]

The initial part of the collection without its last element.

Note: Even when applied to a view or a lazy collection it will always force the elements.

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Definition Classes
IterableOps

def inits: collection.Iterator[Array[T]]

Iterates over the inits of this array. The first value will be this array and the final one will be an empty array, with the intervening values the results of successive applications of init.

returns

an iterator over all the inits of this array

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Definition Classes
ArrayOps

def inits: collection.Iterator[collection.immutable.IndexedSeq[T]]

Iterates over the inits of this immutable sequence. The first value will be this immutable sequence and the final one will be an empty immutable sequence, with the intervening values the results of successive applications of init.

Note: Even when applied to a view or a lazy collection it will always force the elements.

returns

an iterator over all the inits of this immutable sequence

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Definition Classes
IterableOps
Example:

    List(1,2,3).inits = Iterator(List(1,2,3), List(1,2), List(1), Nil)

def isEmpty: Boolean

Tests whether the array is empty.

returns

true if the array contains no elements, false otherwise.

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Definition Classes
ArrayOps
Annotations
@inline()

def isEmpty: Boolean

Tests whether the immutable sequence is empty.

Note: Implementations in subclasses that are not repeatedly traversable must take care not to consume any elements when isEmpty is called.

returns

true if the immutable sequence contains no elements, false otherwise.

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Definition Classes
SeqOpsIterableOnceOps

def iterator: collection.Iterator[T]

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Definition Classes
ArrayOps

def iterator: collection.Iterator[T]

Iterator can be used only once

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Definition Classes
IndexedSeqOpsIterableOnce

def knownSize: Int

The size of this array.

returns

the number of elements in this array.

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Definition Classes
ArrayOps
Annotations
@inline()

def knownSize: Int

returns

The number of elements in this immutable sequence, if it can be cheaply computed, -1 otherwise. Cheaply usually means: Not requiring a collection traversal.

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Definition Classes
IndexedSeqOpsIterableOnce

def last: T

Selects the last element.

returns

The last element of this array.

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Definition Classes
ArrayOps
Exceptions thrown

NoSuchElementException If the array is empty.

def last: T

Selects the last element.

returns

The last element of this immutable sequence.

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Definition Classes
IndexedSeqOpsIterableOps
Exceptions thrown

NoSuchElementException If the immutable sequence is empty.

def lastIndexOf(elem: T, end: Int = xs.length - 1): Int

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.

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Definition Classes
ArrayOps

def lastIndexOf[B >: A](elem: B, end: Int = length - 1): Int

Finds index of last occurrence of some value in this immutable sequence before or at a given end index.

Note: will not terminate for infinite-sized collections.

B

the type of the element elem.

elem

the element value to search for.

end

the end index.

returns

the index <= end of the last element of this immutable sequence that is equal (as determined by ==) to elem, or -1, if none exists.

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Definition Classes
SeqOps

def lastIndexWhere(p: (T) => Boolean, end: Int = xs.length - 1): Int

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 array that satisfies the predicate p, or -1, if none exists.

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Definition Classes
ArrayOps

def lastIndexWhere(p: (T) => Boolean, end: Int): Int

Finds index of last element satisfying some predicate before or at given end index.

Note: will not terminate for infinite-sized collections.

p

the predicate used to test elements.

returns

the index <= end of the last element of this immutable sequence that satisfies the predicate p, or -1, if none exists.

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Definition Classes
SeqOps

def lastOption: Option[T]

Optionally selects the last element.

returns

the last element of this array$ if it is nonempty, None if it is empty.

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Definition Classes
ArrayOps

def lastOption: Option[T]

Optionally selects the last element.

returns

the last element of this immutable sequence$ if it is nonempty, None if it is empty.

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Definition Classes
IterableOps

def length(): Int

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Definition Classes
ArrayCharSequence → CharSequence

def length: Int

The length (number of elements) of the immutable sequence. size is an alias for length in Seq collections.

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Definition Classes
SeqOps

def lengthCompare(len: Int): Int

Compares the length of this array 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
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Definition Classes
ArrayOps

final def lengthCompare(len: Int): Int

Compares the length of this immutable 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 overridden if computing length is cheap and knownSize returns -1.

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Definition Classes
IndexedSeqOpsSeqOps
See also

lengthIs

def lengthIs: Int

Method mirroring SeqOps.lengthIs for consistency, except it returns an Int because length is known and comparison is constant-time.

These operations are equivalent to lengthCompare(Int), and allow the following more readable usages:

this.lengthIs < len     // this.lengthCompare(len) < 0
this.lengthIs <= len    // this.lengthCompare(len) <= 0
this.lengthIs == len    // this.lengthCompare(len) == 0
this.lengthIs != len    // this.lengthCompare(len) != 0
this.lengthIs >= len    // this.lengthCompare(len) >= 0
this.lengthIs > len     // this.lengthCompare(len) > 0
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Definition Classes
ArrayOps

final def lengthIs: SizeCompareOps

Returns a value class containing operations for comparing the length of this immutable sequence to a test value.

These operations are implemented in terms of lengthCompare(Int), and allow the following more readable usages:

this.lengthIs < len     // this.lengthCompare(len) < 0
this.lengthIs <= len    // this.lengthCompare(len) <= 0
this.lengthIs == len    // this.lengthCompare(len) == 0
this.lengthIs != len    // this.lengthCompare(len) != 0
this.lengthIs >= len    // this.lengthCompare(len) >= 0
this.lengthIs > len     // this.lengthCompare(len) > 0
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Definition Classes
SeqOps
Annotations
@inline()

def nonEmpty: Boolean

Tests whether the array is not empty.

returns

true if the array contains at least one element, false otherwise.

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Definition Classes
ArrayOps
Annotations
@inline()

def nonEmpty: Boolean

Tests whether the immutable sequence is not empty.

returns

true if the immutable sequence contains at least one element, false otherwise.

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
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Definition Classes
IterableOnceOps
Annotations
@deprecatedOverriding("nonEmpty is defined as !isEmpty; override isEmpty instead", "2.13.0")

def partition(p: (T) => Boolean): (Array[T], Array[T])

A pair of, first, all elements that satisfy predicate p and, second, all elements that do not.

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Definition Classes
ArrayOps

def partition(p: (T) => Boolean): (collection.immutable.IndexedSeq[T], collection.immutable.IndexedSeq[T])

A pair of, first, all elements that satisfy predicate p and, second, all elements that do not. Interesting because it splits a collection in two.

The default implementation provided here needs to traverse the collection twice. Strict collections have an overridden version of partition in StrictOptimizedIterableOps, which requires only a single traversal.

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Definition Classes
IterableOps

def permutations: collection.Iterator[Array[T]]

Iterates over distinct permutations.

returns

An Iterator which traverses the distinct permutations of this array.

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Definition Classes
ArrayOps
Example:
    Array("a", "b", "b").permutations == Iterator(Array(a, b, b), Array(b, a, b), Array(b, b, a))

def permutations: collection.Iterator[collection.immutable.IndexedSeq[T]]

Iterates over distinct permutations.

Note: Even when applied to a view or a lazy collection it will always force the elements.

returns

An Iterator which traverses the distinct permutations of this immutable sequence.

Implicit
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Definition Classes
SeqOps
Example:

    "abb".permutations = Iterator(abb, bab, bba)

def reverse: Array[T]

Returns a new array with the elements in reversed order.

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Definition Classes
ArrayOps
Annotations
@inline()

def reverse: collection.immutable.IndexedSeq[T]

Returns new immutable sequence with elements in reversed order.

Note: will not terminate for infinite-sized collections.

Note: Even when applied to a view or a lazy collection it will always force the elements.

returns

A new immutable sequence with all elements of this immutable sequence in reversed order.

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Definition Classes
IndexedSeqOpsSeqOps

def reverseIterator: collection.Iterator[T]

An iterator yielding elements in reversed order.

Note: xs.reverseIterator is the same as xs.reverse.iterator but implemented more efficiently.

returns

an iterator yielding the elements of this array in reversed order

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Definition Classes
ArrayOps

def reverseIterator: collection.Iterator[T]

An iterator yielding elements in reversed order.

Note: will not terminate for infinite-sized collections.

Note: xs.reverseIterator is the same as xs.reverse.iterator but might be more efficient.

returns

an iterator yielding the elements of this immutable sequence in reversed order

Implicit
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Definition Classes
IndexedSeqOpsSeqOps

def size: Int

The size of this array.

returns

the number of elements in this array.

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Definition Classes
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Annotations
@inline()

final def size: Int

The size of this immutable sequence.

Note: will not terminate for infinite-sized collections.

returns

the number of elements in this immutable sequence.

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Definition Classes
SeqOpsIterableOnceOps

def sizeCompare(otherSize: Int): Int

Compares the size of this array to a test value.

otherSize

the test value that gets compared with the size.

returns

A value x where

x <  0       if this.size <  otherSize
x == 0       if this.size == otherSize
x >  0       if this.size >  otherSize
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Definition Classes
ArrayOps

final def sizeCompare(otherSize: Int): Int

Compares the size of this immutable sequence to a test value.

otherSize

the test value that gets compared with the size.

returns

A value x where

x <  0       if this.size <  otherSize
x == 0       if this.size == otherSize
x >  0       if this.size >  otherSize

The method as implemented here does not call size directly; its running time is O(size min otherSize) instead of O(size). The method should be overridden if computing size is cheap and knownSize returns -1.

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Definition Classes
SeqOpsIterableOps
See also

sizeIs

def sizeIs: Int

Method mirroring SeqOps.sizeIs for consistency, except it returns an Int because size is known and comparison is constant-time.

These operations are equivalent to sizeCompare(Int), and allow the following more readable usages:

this.sizeIs < size     // this.sizeCompare(size) < 0
this.sizeIs <= size    // this.sizeCompare(size) <= 0
this.sizeIs == size    // this.sizeCompare(size) == 0
this.sizeIs != size    // this.sizeCompare(size) != 0
this.sizeIs >= size    // this.sizeCompare(size) >= 0
this.sizeIs > size     // this.sizeCompare(size) > 0
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Definition Classes
ArrayOps

final def sizeIs: SizeCompareOps

Returns a value class containing operations for comparing the size of this immutable sequence to a test value.

These operations are implemented in terms of sizeCompare(Int), and allow the following more readable usages:

this.sizeIs < size     // this.sizeCompare(size) < 0
this.sizeIs <= size    // this.sizeCompare(size) <= 0
this.sizeIs == size    // this.sizeCompare(size) == 0
this.sizeIs != size    // this.sizeCompare(size) != 0
this.sizeIs >= size    // this.sizeCompare(size) >= 0
this.sizeIs > size     // this.sizeCompare(size) > 0
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Definition Classes
IterableOps
Annotations
@inline()

def slice(from: Int, until: Int): Array[T]

Selects an interval of elements. The returned array is made up of all elements x which satisfy the invariant:

from <= indexOf(x) < until
from

the lowest index to include from this array.

until

the lowest index to EXCLUDE from this array.

returns

an array containing the elements greater than or equal to index from extending up to (but not including) index until of this array.

Implicit
This member is added by an implicit conversion from Array[T] toArrayOps[T] performed by method genericArrayOps in scala.Predef.
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(array: ArrayOps[T]).slice(from, until)
Definition Classes
ArrayOps

def slice(from: Int, until: Int): collection.immutable.IndexedSeq[T]

Selects an interval of elements. The returned immutable sequence is made up of all elements x which satisfy the invariant:

from <= indexOf(x) < until
from

the lowest index to include from this immutable sequence.

until

the lowest index to EXCLUDE from this immutable sequence.

returns

a immutable sequence containing the elements greater than or equal to index from extending up to (but not including) index until of this immutable sequence.

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
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To access this member you can use a type ascription:
(array: IndexedSeq[T]).slice(from, until)
Definition Classes
IndexedSeqOpsIndexedSeqOpsIterableOpsIterableOnceOps
Note

Reuse: After calling this method, one should discard the iterator it was called on, and use only the iterator that was returned. Using the old iterator is undefined, subject to change, and may result in changes to the new iterator as well.

def sliding(size: Int, step: Int = 1): 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.)

size

the number of elements per group

step

the distance between the first elements of successive groups

returns

An iterator producing arrays 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] toArrayOps[T] performed by method genericArrayOps in scala.Predef.
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(array: ArrayOps[T]).sliding(size, step)
Definition Classes
ArrayOps
See also

scala.collection.Iterator, method sliding

def sliding(size: Int, step: Int): collection.Iterator[collection.immutable.IndexedSeq[T]]

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 immutable 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] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
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(array: IndexedSeq[T]).sliding(size, step)
Definition Classes
IterableOps
See also

scala.collection.Iterator, method sliding

def sortWith(lt: (T, T) => Boolean): Array[T]

Sorts this array 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

an array consisting of the elements of this array sorted according to the comparison function lt.

Implicit
This member is added by an implicit conversion from Array[T] toArrayOps[T] performed by method genericArrayOps in scala.Predef.
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(array: ArrayOps[T]).sortWith(lt)
Definition Classes
ArrayOps

def sortWith(lt: (T, T) => Boolean): collection.immutable.IndexedSeq[T]

Sorts this immutable sequence according to a comparison function.

Note: will not terminate for infinite-sized collections.

Note: Even when applied to a view or a lazy collection it will always force the elements.

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 immutable sequence consisting of the elements of this immutable sequence sorted according to the comparison function lt.

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Shadowing
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To access this member you can use a type ascription:
(array: IndexedSeq[T]).sortWith(lt)
Definition Classes
SeqOps
Example:
    List("Steve", "Tom", "John", "Bob").sortWith(_.compareTo(_) < 0) =
    List("Bob", "John", "Steve", "Tom")

def span(p: (T) => Boolean): (Array[T], Array[T])

Splits this array into a prefix/suffix pair according to a predicate.

Note: c span p is equivalent to (but more efficient than) (c takeWhile p, c dropWhile p), provided the evaluation of the predicate p does not cause any side-effects.

p

the test predicate

returns

a pair consisting of the longest prefix of this array whose elements all satisfy p, and the rest of this array.

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

def span(p: (T) => Boolean): (collection.immutable.IndexedSeq[T], collection.immutable.IndexedSeq[T])

Splits this immutable 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.

p

the test predicate

returns

a pair consisting of the longest prefix of this immutable sequence whose elements all satisfy p, and the rest of this immutable sequence.

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Shadowing
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Definition Classes
IterableOpsIterableOnceOps
Note

Reuse: After calling this method, one should discard the iterator it was called on, and use only the iterators that were returned. Using the old iterator is undefined, subject to change, and may result in changes to the new iterators as well.

def splitAt(n: Int): (Array[T], Array[T])

Splits this array into two at a given position. Note: c splitAt n is equivalent to (c take n, c drop n).

n

the position at which to split.

returns

a pair of arrays consisting of the first n elements of this array, and the other elements.

Implicit
This member is added by an implicit conversion from Array[T] toArrayOps[T] performed by method genericArrayOps in scala.Predef.
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(array: ArrayOps[T]).splitAt(n)
Definition Classes
ArrayOps

def splitAt(n: Int): (collection.immutable.IndexedSeq[T], collection.immutable.IndexedSeq[T])

Splits this immutable sequence into a prefix/suffix pair 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 immutable sequences consisting of the first n elements of this immutable sequence, and the other elements.

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Shadowing
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To access this member you can use a type ascription:
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Definition Classes
IterableOpsIterableOnceOps
Note

Reuse: After calling this method, one should discard the iterator it was called on, and use only the iterators that were returned. Using the old iterator is undefined, subject to change, and may result in changes to the new iterators as well.

def tail: Array[T]

The rest of the array without its first element.

Implicit
This member is added by an implicit conversion from Array[T] toArrayOps[T] performed by method genericArrayOps in scala.Predef.
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(array: ArrayOps[T]).tail
Definition Classes
ArrayOps

def tail: collection.immutable.IndexedSeq[T]

The rest of the collection without its first element.

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
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(array: IndexedSeq[T]).tail
Definition Classes
IterableOps

def tails: collection.Iterator[Array[T]]

Iterates over the tails of this array. The first value will be this array and the final one will be an empty array, with the intervening values the results of successive applications of tail.

returns

an iterator over all the tails of this array

Implicit
This member is added by an implicit conversion from Array[T] toArrayOps[T] performed by method genericArrayOps in scala.Predef.
Shadowing
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(array: ArrayOps[T]).tails
Definition Classes
ArrayOps

def tails: collection.Iterator[collection.immutable.IndexedSeq[T]]

Iterates over the tails of this immutable sequence. The first value will be this immutable sequence and the final one will be an empty immutable sequence, with the intervening values the results of successive applications of tail.

returns

an iterator over all the tails of this immutable sequence

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Shadowing
This implicitly inherited member is ambiguous. One or more implicitly inherited members have similar signatures, so calling this member may produce an ambiguous implicit conversion compiler error.
To access this member you can use a type ascription:
(array: IndexedSeq[T]).tails
Definition Classes
IterableOps
Example:

    List(1,2,3).tails = Iterator(List(1,2,3), List(2,3), List(3), Nil)

def take(n: Int): Array[T]

An array containing the first n elements of this array.

Implicit
This member is added by an implicit conversion from Array[T] toArrayOps[T] performed by method genericArrayOps in scala.Predef.
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This implicitly inherited member is ambiguous. One or more implicitly inherited members have similar signatures, so calling this member may produce an ambiguous implicit conversion compiler error.
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(array: ArrayOps[T]).take(n)
Definition Classes
ArrayOps

def take(n: Int): collection.immutable.IndexedSeq[T]

Selects the first n elements.

n

the number of elements to take from this immutable sequence.

returns

a immutable sequence consisting only of the first n elements of this immutable sequence, or else the whole immutable sequence, if it has less than n elements. If n is negative, returns an empty immutable sequence.

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Shadowing
This implicitly inherited member is ambiguous. One or more implicitly inherited members have similar signatures, so calling this member may produce an ambiguous implicit conversion compiler error.
To access this member you can use a type ascription:
(array: IndexedSeq[T]).take(n)
Definition Classes
IndexedSeqOpsIterableOpsIterableOnceOps
Note

Reuse: After calling this method, one should discard the iterator it was called on, and use only the iterator that was returned. Using the old iterator is undefined, subject to change, and may result in changes to the new iterator as well.

def takeRight(n: Int): Array[T]

An array containing the last n elements of this array.

Implicit
This member is added by an implicit conversion from Array[T] toArrayOps[T] performed by method genericArrayOps in scala.Predef.
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(array: ArrayOps[T]).takeRight(n)
Definition Classes
ArrayOps

def takeRight(n: Int): collection.immutable.IndexedSeq[T]

Selects the last n elements.

n

the number of elements to take from this immutable sequence.

returns

a immutable sequence consisting only of the last n elements of this immutable sequence, or else the whole immutable sequence, if it has less than n elements. If n is negative, returns an empty immutable sequence.

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Shadowing
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(array: IndexedSeq[T]).takeRight(n)
Definition Classes
IndexedSeqOpsIterableOps

def takeWhile(p: (T) => Boolean): Array[T]

Takes longest prefix of elements that satisfy a predicate.

p

The predicate used to test elements.

returns

the longest prefix of this array whose elements all satisfy the predicate p.

Implicit
This member is added by an implicit conversion from Array[T] toArrayOps[T] performed by method genericArrayOps in scala.Predef.
Shadowing
This implicitly inherited member is ambiguous. One or more implicitly inherited members have similar signatures, so calling this member may produce an ambiguous implicit conversion compiler error.
To access this member you can use a type ascription:
(array: ArrayOps[T]).takeWhile(p)
Definition Classes
ArrayOps

def takeWhile(p: (T) => Boolean): collection.immutable.IndexedSeq[T]

Takes longest prefix of elements that satisfy a predicate.

p

The predicate used to test elements.

returns

the longest prefix of this immutable sequence whose elements all satisfy the predicate p.

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Shadowing
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(array: IndexedSeq[T]).takeWhile(p)
Definition Classes
IterableOpsIterableOnceOps

def toIndexedSeq: collection.immutable.IndexedSeq[T]

Implicit
This member is added by an implicit conversion from Array[T] toArrayOps[T] performed by method genericArrayOps in scala.Predef.
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(array: ArrayOps[T]).toIndexedSeq
Definition Classes
ArrayOps

final def toIndexedSeq: collection.immutable.IndexedSeq[T]

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
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(array: IndexedSeq[T]).toIndexedSeq
Definition Classes
IndexedSeqIterableOnceOps

final def toSeq: collection.immutable.Seq[T]

Implicit
This member is added by an implicit conversion from Array[T] toArrayOps[T] performed by method genericArrayOps in scala.Predef.
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(array: ArrayOps[T]).toSeq
Definition Classes
ArrayOps
Annotations
@inline()

final def toSeq: collection.immutable.IndexedSeq[T]

returns

This collection as a Seq[A]. This is equivalent to to(Seq) but might be faster.

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
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(array: IndexedSeq[T]).toSeq
Definition Classes
SeqIterableOnceOps

def toString(): String

Creates a String representation of this object. The default representation is platform dependent. On the java platform it is the concatenation of the class name, "@", and the object's hashcode in hexadecimal.

returns

a String representation of the object.

Implicit
This member is added by an implicit conversion from Array[T] toArrayCharSequence performed by method ArrayCharSequence in scala.Predef.This conversion will take place only if T is Char (T =:= Char).
Shadowing
This implicitly inherited member is shadowed by one or more members in this class.
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(array: ArrayCharSequence).toString()
Definition Classes
ArrayCharSequence → CharSequence → AnyRef → Any

def toString(): String

Creates a String representation of this object. The default representation is platform dependent. On the java platform it is the concatenation of the class name, "@", and the object's hashcode in hexadecimal.

returns

a String representation of the object.

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
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(array: IndexedSeq[T]).toString()
Definition Classes
SeqFunction1Iterable → AnyRef → Any

def view: IndexedSeqView[T]

Implicit
This member is added by an implicit conversion from Array[T] toArrayOps[T] performed by method genericArrayOps in scala.Predef.
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(array: ArrayOps[T]).view
Definition Classes
ArrayOps
Annotations
@inline()

def view: IndexedSeqView[T]

A view over the elements of this collection.

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Shadowing
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(array: IndexedSeq[T]).view
Definition Classes
IndexedSeqOpsSeqOpsIterableOps

def withFilter(p: (T) => Boolean): WithFilter[T]

Creates a non-strict filter of this array.

Note: the difference between c filter p and c withFilter p is that the former creates a new array, 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 ArrayOps.WithFilter, which supports map, flatMap, foreach, and withFilter operations. All these operations apply to those elements of this array which satisfy the predicate p.

Implicit
This member is added by an implicit conversion from Array[T] toArrayOps[T] performed by method genericArrayOps in scala.Predef.
Shadowing
This implicitly inherited member is ambiguous. One or more implicitly inherited members have similar signatures, so calling this member may produce an ambiguous implicit conversion compiler error.
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(array: ArrayOps[T]).withFilter(p)
Definition Classes
ArrayOps

def withFilter(p: (T) => Boolean): WithFilter[T, [_]collection.immutable.IndexedSeq[_]]

Creates a non-strict filter of this immutable 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 immutable sequence which satisfy the predicate p.

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Shadowing
This implicitly inherited member is ambiguous. One or more implicitly inherited members have similar signatures, so calling this member may produce an ambiguous implicit conversion compiler error.
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(array: IndexedSeq[T]).withFilter(p)
Definition Classes
IterableOps

def zipWithIndex: Array[(T, Int)]

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] toArrayOps[T] performed by method genericArrayOps in scala.Predef.
Shadowing
This implicitly inherited member is ambiguous. One or more implicitly inherited members have similar signatures, so calling this member may produce an ambiguous implicit conversion compiler error.
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(array: ArrayOps[T]).zipWithIndex
Definition Classes
ArrayOps

def zipWithIndex: collection.immutable.IndexedSeq[(T, Int)]

Zips this immutable sequence with its indices.

returns

A new immutable sequence containing pairs consisting of all elements of this immutable sequence paired with their index. Indices start at 0.

Implicit
This member is added by an implicit conversion from Array[T] toIndexedSeq[T] performed by method copyArrayToImmutableIndexedSeq in scala.LowPriorityImplicits2.
Shadowing
This implicitly inherited member is ambiguous. One or more implicitly inherited members have similar signatures, so calling this member may produce an ambiguous implicit conversion compiler error.
To access this member you can use a type ascription:
(array: IndexedSeq[T]).zipWithIndex
Definition Classes
IterableOpsIterableOnceOps
Example:

    List("a", "b", "c").zipWithIndex == List(("a", 0), ("b", 1), ("c", 2))

Note

Reuse: After calling this method, one should discard the iterator it was called on, and use only the iterator that was returned. Using the old iterator is undefined, subject to change, and may result in changes to the new iterator as well.

© 2002-2019 EPFL, with contributions from Lightbend.
Licensed under the Apache License, Version 2.0.
https://www.scala-lang.org/api/2.13.0/scala/Array.html