Queue

Instance Constructors

new Queue(in: List[A], out: List[A])

Attributes
protected

Type Members

type Self = Queue[A]

The type implementing this traversable
The type implementing this traversable

Attributes
protected[this]
Definition Classes
TraversableLike
class WithFilter extends FilterMonadic[A, Repr]

A class supporting filtered operations.

Value Members

final def !=(arg0: AnyRef): Boolean

Definition Classes
AnyRef
final def !=(arg0: Any): Boolean

Definition Classes
Any
final def ##(): Int

Definition Classes
AnyRef → Any
def +(other: String): String

Implicit information
This member is added by an implicit conversion from Queue[A] to StringAdd[Queue[A]] performed by method StringAdd in scala.Predef.
Definition Classes
StringAdd
def ++[B](that: GenTraversableOnce[B]): Queue[B]

[use case] Returns a new immutable queue containing the elements from the left hand operand followed by the elements from the right hand operand.
[use case]
Returns a new immutable queue containing the elements from the left hand operand followed by the elements from the right hand operand. The element type of the immutable queue is the most specific superclass encompassing the element types of the two operands.
Example:
```
scala> val a = LinkedList(1)
a: scala.collection.mutable.LinkedList[Int] = LinkedList(1)

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

scala> val c = a ++ b
c: scala.collection.mutable.LinkedList[Int] = LinkedList(1, 2)

scala> val d = LinkedList('a')
d: scala.collection.mutable.LinkedList[Char] = LinkedList(a)

scala> val e = c ++ d
e: scala.collection.mutable.LinkedList[AnyVal] = LinkedList(1, 2, a)
```
B
the element type of the returned collection.
that
the traversable to append.
returns
a new immutable queue which contains all elements of this immutable queue followed by all elements of that.

Definition Classes
TraversableLike → GenTraversableLike
Full Signature
def ++[B >: A, That](that: GenTraversableOnce[B])(implicit bf: CanBuildFrom[Queue[A], B, That]): That
def ++:[B >: A, That](that: collection.Traversable[B])(implicit bf: CanBuildFrom[Queue[A], B, That]): That

As with ++, returns a new collection containing the elements from the left operand followed by the elements from the right operand.
As with ++, returns a new collection containing the elements from the left operand followed by the elements from the right operand.
It differs from ++ in that the right operand determines the type of the resulting collection rather than the left one. Mnemonic: the COLon is on the side of the new COLlection type.
Example:
```
scala> val x = List(1)
x: List[Int] = List(1)

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

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

Definition Classes
TraversableLike
def ++:[B](that: TraversableOnce[B]): Queue[B]

[use case] As with ++, returns a new collection containing the elements from the left operand followed by the elements from the right operand.
[use case]
As with ++, returns a new collection containing the elements from the left operand followed by the elements from the right operand.
It differs from ++ in that the right operand determines the type of the resulting collection rather than the left one. Mnemonic: the COLon is on the side of the new COLlection type.
Example:
```
scala> val x = List(1)
x: List[Int] = List(1)

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

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

Definition Classes
TraversableLike
Full Signature
def ++:[B >: A, That](that: TraversableOnce[B])(implicit bf: CanBuildFrom[Queue[A], B, That]): That
def +:(elem: A): Queue[A]

[use case] A copy of the immutable queue with an element prepended.
[use case]
A copy of the immutable queue with an element prepended.
Note that :-ending operators are right associative (see example). A mnemonic for +: vs. :+ is: the COLon goes on the COLlection side.
Also, the original immutable queue is not modified, so you will want to capture the result.
Example:
```
scala> val x = LinkedList(1)
x: scala.collection.mutable.LinkedList[Int] = LinkedList(1)

scala> val y = 2 +: x
y: scala.collection.mutable.LinkedList[Int] = LinkedList(2, 1)

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

Definition Classes
SeqLike → GenSeqLike
Full Signature
def +:[B >: A, That](elem: B)(implicit bf: CanBuildFrom[Queue[A], B, That]): That
def ->[B](y: B): (Queue[A], B)

Implicit information
This member is added by an implicit conversion from Queue[A] to ArrowAssoc[Queue[A]] performed by method ArrowAssoc in scala.Predef.
Definition Classes
ArrowAssoc
Annotations
@inline()
def /:[B](z: B)(op: (B, A) ⇒ B): B

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

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

scala> val c = (5 /: a)((x,y) => x + y)
c: Int = 15
```
B
the result type of the binary operator.
z
the start value.
op
the binary operator.
returns
the result of inserting op between consecutive elements of this immutable queue, going left to right with the start value z on the left:
```
op(...op(op(z, x_1), x_2), ..., x_n)
```
where x₁, ..., x_n are the elements of this immutable queue.
Definition Classes
TraversableOnce → GenTraversableOnce
def :+(elem: A): Queue[A]

[use case] A copy of this immutable queue with an element appended.
[use case]
A copy of this immutable queue with an element appended.
A mnemonic for +: vs. :+ is: the COLon goes on the COLlection side.
Example:
```
scala> import scala.collection.mutable.LinkedList
import scala.collection.mutable.LinkedList

scala> val a = LinkedList(1)
a: scala.collection.mutable.LinkedList[Int] = LinkedList(1)

scala> val b = a :+ 2
b: scala.collection.mutable.LinkedList[Int] = LinkedList(1, 2)

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

Definition Classes
SeqLike → GenSeqLike
Full Signature
def :+[B >: A, That](elem: B)(implicit bf: CanBuildFrom[Queue[A], B, That]): That
def :\[B](z: B)(op: (A, B) ⇒ B): B

Applies a binary operator to all elements of this immutable queue and a start value, going right to left.
Applies a binary operator to all elements of this immutable queue and a start value, going right to left.
Note: :\ is alternate syntax for foldRight; xs :\ z is the same as xs foldRight z.
Examples:
Note that the folding function used to compute b is equivalent to that used to compute c.
```
scala> val a = LinkedList(1,2,3,4)
a: scala.collection.mutable.LinkedList[Int] = LinkedList(1, 2, 3, 4)

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

scala> val c = (a :\ 5)((x,y) => x + y)
c: Int = 15
```
B
the result type of the binary operator.
z
the start value
op
the binary operator
returns
the result of inserting op between consecutive elements of this immutable queue, going right to left with the start value z on the right:
```
op(x_1, op(x_2, ... op(x_n, z)...))
```
where x₁, ..., x_n are the elements of this immutable queue.
Definition Classes
TraversableOnce → GenTraversableOnce
final def ==(arg0: AnyRef): Boolean

Definition Classes
AnyRef
final def ==(arg0: Any): Boolean

Definition Classes
Any
def addString(b: StringBuilder): StringBuilder

Appends all elements of this immutable queue to a string builder.
Appends all elements of this immutable queue to a string builder. The written text consists of the string representations (w.r.t. the method toString) of all elements of this immutable queue without any separator string.
Example:
```
scala> val a = LinkedList(1,2,3,4)
a: scala.collection.mutable.LinkedList[Int] = LinkedList(1, 2, 3, 4)

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

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

Definition Classes
TraversableOnce
def addString(b: StringBuilder, sep: String): StringBuilder

Appends all elements of this immutable queue to a string builder using a separator string.
Appends all elements of this immutable queue 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 queue, separated by the string sep.
Example:
```
scala> val a = LinkedList(1,2,3,4)
a: scala.collection.mutable.LinkedList[Int] = LinkedList(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.

Definition Classes
TraversableOnce
def addString(b: StringBuilder, start: String, sep: String, end: String): StringBuilder

Appends all elements of this immutable queue to a string builder using start, end, and separator strings.
Appends all elements of this immutable queue 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 queue are separated by the string sep.
Example:
```
scala> val a = LinkedList(1,2,3,4)
a: scala.collection.mutable.LinkedList[Int] = LinkedList(1, 2, 3, 4)

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

scala> a.addString(b, "LinkedList(", ", ", ")")
res1: StringBuilder = LinkedList(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.

Definition Classes
TraversableOnce
def aggregate[B](z: ⇒ B)(seqop: (B, A) ⇒ B, combop: (B, B) ⇒ B): B

Aggregates the results of applying an operator to subsequent elements.
Aggregates the results of applying an operator to subsequent elements.
This is a more general form of fold and reduce. It has similar semantics, but does not require the result to be a supertype of the element type. It traverses the elements in different partitions sequentially, using seqop to update the result, and then applies combop to results from different partitions. The implementation of this operation may operate on an arbitrary number of collection partitions, so combop may be invoked an arbitrary number of times.
For example, one might want to process some elements and then produce a Set. In this case, seqop would process an element and append it to the list, while combop would concatenate two lists from different partitions together. The initial value z would be an empty set.
```
pc.aggregate(Set[Int]())(_ += process(_), _ ++ _)
```
Another example is calculating geometric mean from a collection of doubles (one would typically require big doubles for this).
B
the type of accumulated results
z
the initial value for the accumulated result of the partition - this will typically be the neutral element for the seqop operator (e.g. Nil for list concatenation or 0 for summation) and may be evaluated more than once
seqop
an operator used to accumulate results within a partition
combop
an associative operator used to combine results from different partitions

Definition Classes
TraversableOnce → GenTraversableOnce
def andThen[C](k: (A) ⇒ C): PartialFunction[Int, C]

Composes this partial function with a transformation function that gets applied to results of this partial function.
Composes this partial function with a transformation function that gets applied to results of this partial function.
C
the result type of the transformation function.
k
the transformation function
returns
a partial function with the same domain as this partial function, which maps arguments x to k(this(x)).

Definition Classes
PartialFunction → Function1
def apply(n: Int): A

Returns the n-th element of this queue.
Returns the n-th element of this queue. The first element is at position 0.
n
index of the element to return
returns
the element at position n in this queue.

Definition Classes
Queue → SeqLike → GenSeqLike → Function1
Exceptions thrown
Predef.NoSuchElementException
if the queue is too short.
def applyOrElse[A1 <: Int, B1 >: A](x: A1, default: (A1) ⇒ B1): B1

Applies this partial function to the given argument when it is contained in the function domain.
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 compiler generates 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.

Definition Classes
PartialFunction
Since
2.10
final def asInstanceOf[T0]: T0

Definition Classes
Any
def asParIterable: ParIterable[A]

Implicit information
This member is added by an implicit conversion from Queue[A] to TraversableOps[A] performed by method traversable2ops in scala.collection.parallel.
Definition Classes
TraversableOps
def asParSeq: ParSeq[A]

Implicit information
This member is added by an implicit conversion from Queue[A] to TraversableOps[A] performed by method traversable2ops in scala.collection.parallel.
Definition Classes
TraversableOps
def canEqual(that: Any): Boolean

Method called from equality methods, so that user-defined subclasses can refuse to be equal to other collections of the same kind.
Method called from equality methods, so that user-defined subclasses can refuse to be equal to other collections of the same kind.
that
The object with which this immutable queue should be compared
returns
true, if this immutable queue can possibly equal that, false otherwise. The test takes into consideration only the run-time types of objects but ignores their elements.

Definition Classes
IterableLike → Equals
def clone(): AnyRef

Attributes
protected[java.lang]
Definition Classes
AnyRef
Annotations
@throws()
def collect[B](pf: PartialFunction[A, B]): Queue[B]

[use case] Builds a new collection by applying a partial function to all elements of this immutable queue on which the function is defined.
[use case]
Builds a new collection by applying a partial function to all elements of this immutable queue on which the function is defined.
B
the element type of the returned collection.
pf
the partial function which filters and maps the immutable queue.
returns
a new immutable queue 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.

Definition Classes
TraversableLike → GenTraversableLike
Full Signature
def collect[B, That](pf: PartialFunction[A, B])(implicit bf: CanBuildFrom[Queue[A], B, That]): That
def collectFirst[B](pf: PartialFunction[A, B]): Option[B]

Finds the first element of the immutable queue for which the given partial function is defined, and applies the partial function to it.
Finds the first element of the immutable queue for which the given partial function is defined, and applies the partial function to it.
pf
the partial function
returns
an option value containing pf applied to the first value for which it is defined, or None if none exists.
Definition Classes
TraversableOnce
Example:
1. Seq("a", 1, 5L).collectFirst({ case x: Int => x*10 }) = Some(10)
def combinations(n: Int): Iterator[Queue[A]]

Iterates over combinations.
Iterates over combinations.
returns
An Iterator which traverses the possible n-element combinations of this immutable queue.
Definition Classes
SeqLike
Example:
1. "abbbc".combinations(2) = Iterator(ab, ac, bb, bc)
def companion: GenericCompanion[Queue]

The factory companion object that builds instances of class immutable.Queue.
The factory companion object that builds instances of class immutable.Queue. (or its Iterable superclass where class immutable.Queue is not a Seq.)

Definition Classes
Queue → LinearSeq → LinearSeq → Seq → Iterable → Traversable → Seq → GenSeq → Iterable → GenIterable → Traversable → GenTraversable → GenericTraversableTemplate
def compose[A](g: (A) ⇒ Int): (A) ⇒ A

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

Definition Classes
Function1
Annotations
@unspecialized()
def contains[A1 >: A](elem: A1): Boolean

Tests whether this immutable queue contains a given value as an element.
Tests whether this immutable queue contains a given value as an element.
elem
the element to test.
returns
true if this immutable queue has an element that is equal (as determined by ==) to elem, false otherwise.

Definition Classes
SeqLike
def containsSlice[B](that: GenSeq[B]): Boolean

Tests whether this immutable queue contains a given sequence as a slice.
Tests whether this immutable queue contains a given sequence as a slice.
that
the sequence to test
returns
true if this immutable queue contains a slice with the same elements as that, otherwise false.

Definition Classes
SeqLike
def copyToArray(xs: Array[A], start: Int, len: Int): Unit

[use case] Copies elements of this immutable queue to an array.
[use case]
Copies elements of this immutable queue to an array. Fills the given array xs with at most len elements of this immutable queue, starting at position start. Copying will stop once either the end of the current immutable queue is reached, or the end of the array is reached, or len elements have been copied.
xs
the array to fill.
start
the starting index.
len
the maximal number of elements to copy.

Definition Classes
IterableLike → TraversableLike → TraversableOnce → GenTraversableOnce
Full Signature
def copyToArray[B >: A](xs: Array[B], start: Int, len: Int): Unit
def copyToArray(xs: Array[A]): Unit

[use case] Copies values of this immutable queue to an array.
[use case]
Copies values of this immutable queue to an array. Fills the given array xs with values of this immutable queue. Copying will stop once either the end of the current immutable queue is reached, or the end of the array is reached.
xs
the array to fill.

Definition Classes
TraversableOnce → GenTraversableOnce
Full Signature
def copyToArray[B >: A](xs: Array[B]): Unit
def copyToArray(xs: Array[A], start: Int): Unit

[use case] Copies values of this immutable queue to an array.
[use case]
Copies values of this immutable queue to an array. Fills the given array xs with values of this immutable queue, beginning at index start. Copying will stop once either the end of the current immutable queue is reached, or the end of the array is reached.
xs
the array to fill.
start
the starting index.

Definition Classes
TraversableOnce → GenTraversableOnce
Full Signature
def copyToArray[B >: A](xs: Array[B], start: Int): Unit
def copyToBuffer[B >: A](dest: Buffer[B]): Unit

Copies all elements of this immutable queue to a buffer.
Copies all elements of this immutable queue to a buffer.
dest
The buffer to which elements are copied.

Definition Classes
TraversableOnce
final def corresponds[B](that: GenSeq[B])(p: (A, B) ⇒ Boolean): Boolean

Tests whether every element of this immutable queue relates to the corresponding element of another sequence by satisfying a test predicate.
Tests whether every element of this immutable queue 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 queue and y of that, otherwise false.

Definition Classes
LinearSeqLike → SeqLike → GenSeqLike
Annotations
@tailrec()
def count(p: (A) ⇒ Boolean): Int

Counts the number of elements in the immutable queue which satisfy a predicate.
Counts the number of elements in the immutable queue which satisfy a predicate.
p
the predicate used to test elements.
returns
the number of elements satisfying the predicate p.

Definition Classes
TraversableOnce → GenTraversableOnce
def dequeue: (A, Queue[A])

Returns a tuple with the first element in the queue, and a new queue with this element removed.
Returns a tuple with the first element in the queue, and a new queue with this element removed.
returns
the first element of the queue.

Exceptions thrown
Predef.NoSuchElementException
def diff(that: collection.Seq[A]): Queue[A]

[use case] Computes the multiset difference between this immutable queue and another sequence.
[use case]
Computes the multiset difference between this immutable queue and another sequence.
that
the sequence of elements to remove
returns
a new immutable queue which contains all elements of this immutable queue 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.

Definition Classes
SeqLike → GenSeqLike
Full Signature
def diff[B >: A](that: GenSeq[B]): Queue[A]
def distinct: Queue[A]

Builds a new immutable queue from this immutable queue without any duplicate elements.
Builds a new immutable queue from this immutable queue without any duplicate elements.
returns
A new immutable queue which contains the first occurrence of every element of this immutable queue.

Definition Classes
SeqLike → GenSeqLike
def drop(n: Int): Queue[A]

Selects all elements except first n ones.
Selects all elements except first n ones.
n
the number of elements to drop from this immutable queue.
returns
a immutable queue consisting of all elements of this immutable queue except the first n ones, or else the empty immutable queue, if this immutable queue has less than n elements.

Definition Classes
IterableLike → TraversableLike → GenTraversableLike
def dropRight(n: Int): Queue[A]

Selects all elements except last n ones.
Selects all elements except last n ones.
n
The number of elements to take
returns
a immutable queue consisting of all elements of this immutable queue except the last n ones, or else the empty immutable queue, if this immutable queue has less than n elements.

Definition Classes
IterableLike
def dropWhile(p: (A) ⇒ Boolean): Queue[A]

Drops longest prefix of elements that satisfy a predicate.
Drops longest prefix of elements that satisfy a predicate.
returns
the longest suffix of this immutable queue whose first element does not satisfy the predicate p.

Definition Classes
TraversableLike → GenTraversableLike
def endsWith[B](that: GenSeq[B]): Boolean

Tests whether this immutable queue ends with the given sequence.
Tests whether this immutable queue ends with the given sequence.
that
the sequence to test
returns
true if this immutable queue has that as a suffix, false otherwise.

Definition Classes
SeqLike → GenSeqLike
def enqueue[B >: A](iter: Iterable[B]): Queue[B]

Returns a new queue with all elements provided by an Iterable object added at the end of the queue.
Returns a new queue with all elements provided by an Iterable object added at the end of the queue.
The elements are prepended in the order they are given out by the iterator.
iter
an iterable object
def enqueue[B >: A](elem: B): Queue[B]

Creates a new queue with element added at the end of the old queue.
Creates a new queue with element added at the end of the old queue.
elem
the element to insert
def ensuring(cond: (Queue[A]) ⇒ Boolean, msg: ⇒ Any): Queue[A]

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

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

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

Implicit information
This member is added by an implicit conversion from Queue[A] to Ensuring[Queue[A]] performed by method Ensuring in scala.Predef.
Definition Classes
Ensuring
final def eq(arg0: AnyRef): Boolean

Definition Classes
AnyRef
def equals(that: Any): Boolean

The equals method for arbitrary sequences.
The equals method for arbitrary sequences. Compares this sequence to some other object.
that
The object to compare the sequence to
returns
true if that is a sequence that has the same elements as this sequence in the same order, false otherwise

Definition Classes
GenSeqLike → Equals → Any
def exists(p: (A) ⇒ Boolean): Boolean

Tests whether a predicate holds for some of the elements of this immutable queue.
Tests whether a predicate holds for some of the elements of this immutable queue.
p
the predicate used to test elements.
returns
true if the given predicate p holds for some of the elements of this immutable queue, otherwise false.

Definition Classes
IterableLike → TraversableLike → TraversableOnce → GenTraversableOnce
def filter(p: (A) ⇒ Boolean): Queue[A]

Selects all elements of this immutable queue which satisfy a predicate.
Selects all elements of this immutable queue which satisfy a predicate.
p
the predicate used to test elements.
returns
a new immutable queue consisting of all elements of this immutable queue that satisfy the given predicate p. The order of the elements is preserved.

Definition Classes
TraversableLike → GenTraversableLike
def filterNot(p: (A) ⇒ Boolean): Queue[A]

Selects all elements of this immutable queue which do not satisfy a predicate.
Selects all elements of this immutable queue which do not satisfy a predicate.
p
the predicate used to test elements.
returns
a new immutable queue consisting of all elements of this immutable queue that do not satisfy the given predicate p. The order of the elements is preserved.

Definition Classes
TraversableLike → GenTraversableLike
def finalize(): Unit

Attributes
protected[java.lang]
Definition Classes
AnyRef
Annotations
@throws()
def find(p: (A) ⇒ Boolean): Option[A]

Finds the first element of the immutable queue satisfying a predicate, if any.
Finds the first element of the immutable queue satisfying a predicate, if any.
p
the predicate used to test elements.
returns
an option value containing the first element in the immutable queue that satisfies p, or None if none exists.

Definition Classes
IterableLike → TraversableLike → TraversableOnce → GenTraversableOnce
def flatMap[B](f: (A) ⇒ GenTraversableOnce[B]): Queue[B]

[use case] Builds a new collection by applying a function to all elements of this immutable queue and using the elements of the resulting collections.
[use case]
Builds a new collection by applying a function to all elements of this immutable queue 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 queue. This might cause unexpected results sometimes. For example:
```
// lettersOf will return a Seq[Char] of likely repeated letters, instead of a Set
def lettersOf(words: Seq[String]) = words flatMap (word => word.toSet)

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

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

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

Definition Classes
TraversableLike → GenTraversableLike → FilterMonadic
Full Signature
def flatMap[B, That](f: (A) ⇒ GenTraversableOnce[B])(implicit bf: CanBuildFrom[Queue[A], B, That]): That
def flatten[B]: Queue[B]

[use case] Converts this immutable queue of traversable collections into a immutable queue formed by the elements of these traversable collections.
[use case]
Converts this immutable queue of traversable collections into a immutable queue formed by the elements of these traversable collections.
The resulting collection's type will be guided by the static type of immutable queue. For example:
```
val xs = List(Set(1, 2, 3), Set(1, 2, 3))
// xs == List(1, 2, 3, 1, 2, 3)

val ys = Set(List(1, 2, 3), List(3, 2, 1))
// ys == Set(1, 2, 3)
```
B
the type of the elements of each traversable collection.
returns
a new immutable queue resulting from concatenating all element immutable queues.

Definition Classes
GenericTraversableTemplate
Full Signature
def flatten[B](implicit asTraversable: (A) ⇒ GenTraversableOnce[B]): Queue[B]
def fold[A1 >: A](z: A1)(op: (A1, A1) ⇒ A1): A1

Folds the elements of this immutable queue using the specified associative binary operator.
Folds the elements of this immutable queue using the specified associative binary operator.
The order in which operations are performed on elements is unspecified and may be nondeterministic.
A1
a type parameter for the binary operator, a supertype of A.
z
a neutral element for the fold operation; may be added to the result an arbitrary number of times, and must not change the result (e.g., Nil for list concatenation, 0 for addition, or 1 for multiplication.)
op
a binary operator that must be associative
returns
the result of applying fold operator op between all the elements and z

Definition Classes
TraversableOnce → GenTraversableOnce
def foldLeft[B](z: B)(op: (B, A) ⇒ B): B

Applies a binary operator to a start value and all elements of this immutable queue, going left to right.
Applies a binary operator to a start value and all elements of this immutable queue, 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 immutable queue, going left to right with the start value z on the left:
```
op(...op(z, x_1), x_2, ..., x_n)
```
where x₁, ..., x_n are the elements of this immutable queue.
Definition Classes
TraversableOnce → GenTraversableOnce
def foldRight[B](z: B)(op: (A, B) ⇒ B): B

Applies a binary operator to all elements of this immutable queue and a start value, going right to left.
Applies a binary operator to all elements of this immutable queue 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 immutable queue, going right to left with the start value z on the right:
```
op(x_1, op(x_2, ... op(x_n, z)...))
```
where x₁, ..., x_n are the elements of this immutable queue.
Definition Classes
IterableLike → TraversableOnce → GenTraversableOnce
def forall(p: (A) ⇒ Boolean): Boolean

Tests whether a predicate holds for all elements of this immutable queue.
Tests whether a predicate holds for all elements of this immutable queue.
p
the predicate used to test elements.
returns
true if the given predicate p holds for all elements of this immutable queue, otherwise false.

Definition Classes
IterableLike → TraversableLike → TraversableOnce → GenTraversableOnce
def foreach(f: (A) ⇒ Unit): Unit

[use case] Applies a function f to all elements of this immutable queue.
[use case]
Applies a function f to all elements of this immutable queue.
Note: this method underlies the implementation of most other bulk operations. Subclasses should re-implement this method if a more efficient implementation exists.
f
the function that is applied for its side-effect to every element. The result of function f is discarded.

Definition Classes
IterableLike → TraversableLike → GenTraversableLike → TraversableOnce → GenTraversableOnce → FilterMonadic
Full Signature
def foreach[U](f: (A) ⇒ U): Unit
def formatted(fmtstr: String): String

Returns string formatted according to given format string.
Returns string formatted according to given format string. Format strings are as for String.format (@see java.lang.String.format).

Implicit information
This member is added by an implicit conversion from Queue[A] to StringFormat[Queue[A]] performed by method StringFormat in scala.Predef.
Definition Classes
StringFormat
Annotations
@inline()
def front: A

Returns the first element in the queue, or throws an error if there is no element contained in the queue.
Returns the first element in the queue, or throws an error if there is no element contained in the queue.
returns
the first element.

Exceptions thrown
Predef.NoSuchElementException
def genericBuilder[B]: Builder[B, Queue[B]]

The generic builder that builds instances of immutable.Queue at arbitrary element types.
The generic builder that builds instances of immutable.Queue at arbitrary element types.

Definition Classes
GenericTraversableTemplate
final def getClass(): Class[_]

Definition Classes
AnyRef → Any
def groupBy[K](f: (A) ⇒ K): Map[K, Queue[A]]

Partitions this immutable queue into a map of immutable queues according to some discriminator function.
Partitions this immutable queue into a map of immutable queues according to some discriminator function.
Note: this method is not re-implemented by views. This means when applied to a view it will always force the view and return a new immutable queue.
K
the type of keys returned by the discriminator function.
f
the discriminator function.
returns
A map from keys to immutable queues such that the following invariant holds:
```
(xs partition f)(k) = xs filter (x => f(x) == k)
```
That is, every key k is bound to a immutable queue of those elements x for which f(x) equals k.
Definition Classes
TraversableLike → GenTraversableLike
def grouped(size: Int): Iterator[Queue[A]]

Partitions elements in fixed size immutable queues.
Partitions elements in fixed size immutable queues.
size
the number of elements per group
returns
An iterator producing immutable queues of size size, except the last will be truncated if the elements don't divide evenly.

Definition Classes
IterableLike
See also
scala.collection.Iterator, method grouped
def hasDefiniteSize: Boolean

Tests whether this immutable queue is known to have a finite size.
Tests whether this immutable queue is known to have a finite size. All strict collections are known to have finite size. For a non-strict collection such as Stream, the predicate returns true if all elements have been computed. It returns false if the stream is not yet evaluated to the end.
Note: many collection methods will not work on collections of infinite sizes.
returns
true if this collection is known to have finite size, false otherwise.

Definition Classes
TraversableLike → TraversableOnce → GenTraversableOnce
def hashCode(): Int

Hashcodes for immutable.Queue produce a value from the hashcodes of all the elements of the immutable queue.
Hashcodes for immutable.Queue produce a value from the hashcodes of all the elements of the immutable queue.

Definition Classes
LinearSeqLike → GenSeqLike → AnyRef → Any
def head: A

Selects the first element of this immutable queue.
Selects the first element of this immutable queue.
returns
the first element of this immutable queue.

Definition Classes
Queue → IterableLike → GenericTraversableTemplate → TraversableLike → GenTraversableLike
Exceptions thrown
`NoSuchElementException`
if the immutable queue is empty.
def headOption: Option[A]

Optionally selects the first element.
Optionally selects the first element.
returns
the first element of this immutable queue if it is nonempty, None if it is empty.

Definition Classes
TraversableLike → GenTraversableLike
def ifParSeq[R](isbody: (ParSeq[A]) ⇒ R): (TraversableOps[A])#Otherwise[R]

Implicit information
This member is added by an implicit conversion from Queue[A] to TraversableOps[A] performed by method traversable2ops in scala.collection.parallel.
Definition Classes
TraversableOps
val in: List[A]

Attributes
protected
def indexOf(elem: A, from: Int): Int

[use case] Finds index of first occurrence of some value in this immutable queue after or at some start index.
[use case]
Finds index of first occurrence of some value in this immutable queue 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 immutable queue that is equal (as determined by ==) to elem, or -1, if none exists.

Definition Classes
GenSeqLike
Full Signature
def indexOf[B >: A](elem: B, from: Int): Int
def indexOf(elem: A): Int

[use case] Finds index of first occurrence of some value in this immutable queue.
[use case]
Finds index of first occurrence of some value in this immutable queue.
elem
the element value to search for.
returns
the index of the first element of this immutable queue that is equal (as determined by ==) to elem, or -1, if none exists.

Definition Classes
GenSeqLike
Full Signature
def indexOf[B >: A](elem: B): Int
def indexOfSlice[B >: A](that: GenSeq[B], from: Int): Int

Finds first index after or at a start index where this immutable queue contains a given sequence as a slice.
Finds first index after or at a start index where this immutable queue contains a given sequence as a slice.
that
the sequence to test
from
the start index
returns
the first index >= from such that the elements of this immutable queue starting at this index match the elements of sequence that, or -1 of no such subsequence exists.

Definition Classes
SeqLike
def indexOfSlice[B >: A](that: GenSeq[B]): Int

Finds first index where this immutable queue contains a given sequence as a slice.
Finds first index where this immutable queue contains a given sequence as a slice.
that
the sequence to test
returns
the first index such that the elements of this immutable queue starting at this index match the elements of sequence that, or -1 of no such subsequence exists.

Definition Classes
SeqLike
def indexWhere(p: (A) ⇒ Boolean, from: Int): Int

Finds index of the first element satisfying some predicate after or at some start index.
Finds index of the first element satisfying some predicate after or at some start index.
p
the predicate used to test elements.
from
the start index
returns
the index >= from of the first element of this immutable queue that satisfies the predicate p, or -1, if none exists.

Definition Classes
SeqLike → GenSeqLike
def indexWhere(p: (A) ⇒ Boolean): Int

Finds index of first element satisfying some predicate.
Finds index of first element satisfying some predicate.
p
the predicate used to test elements.
returns
the index of the first element of this immutable queue that satisfies the predicate p, or -1, if none exists.

Definition Classes
GenSeqLike
def indices: Range

Produces the range of all indices of this sequence.
Produces the range of all indices of this sequence.
returns
a Range value from 0 to one less than the length of this immutable queue.

Definition Classes
SeqLike
def init: Queue[A]

Selects all elements except the last.
Selects all elements except the last.
returns
a immutable queue consisting of all elements of this immutable queue except the last one.

Definition Classes
TraversableLike → GenTraversableLike
Exceptions thrown
`UnsupportedOperationException`
if the immutable queue is empty.
def inits: Iterator[Queue[A]]

Iterates over the inits of this immutable queue.
Iterates over the inits of this immutable queue. The first value will be this immutable queue and the final one will be an empty immutable queue, with the intervening values the results of successive applications of init.
returns
an iterator over all the inits of this immutable queue
Definition Classes
TraversableLike
Example:
1. List(1,2,3).inits = Iterator(List(1,2,3), List(1,2), List(1), Nil)
def intersect(that: collection.Seq[A]): Queue[A]

[use case] Computes the multiset intersection between this immutable queue and another sequence.
[use case]
Computes the multiset intersection between this immutable queue and another sequence.
that
the sequence of elements to intersect with.
returns
a new immutable queue which contains all elements of this immutable queue 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.

Definition Classes
SeqLike → GenSeqLike
Full Signature
def intersect[B >: A](that: GenSeq[B]): Queue[A]
def isDefinedAt(idx: Int): Boolean

Tests whether this immutable queue contains given index.
Tests whether this immutable queue 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 queue contains an element at position idx, false otherwise.

Definition Classes
GenSeqLike
def isEmpty: Boolean

Checks if the queue is empty.
Checks if the queue is empty.
returns
true, iff there is no element in the queue.

Definition Classes
Queue → SeqLike → IterableLike → GenericTraversableTemplate → TraversableLike → TraversableOnce → GenTraversableOnce
final def isInstanceOf[T0]: Boolean

Definition Classes
Any
def isParIterable: Boolean

Implicit information
This member is added by an implicit conversion from Queue[A] to TraversableOps[A] performed by method traversable2ops in scala.collection.parallel.
Definition Classes
TraversableOps
def isParSeq: Boolean

Implicit information
This member is added by an implicit conversion from Queue[A] to TraversableOps[A] performed by method traversable2ops in scala.collection.parallel.
Definition Classes
TraversableOps
def isParallel: Boolean

Implicit information
This member is added by an implicit conversion from Queue[A] to TraversableOps[A] performed by method traversable2ops in scala.collection.parallel.
Definition Classes
TraversableOps
final def isTraversableAgain: Boolean

Tests whether this immutable queue can be repeatedly traversed.
Tests whether this immutable queue can be repeatedly traversed.
returns
true

Definition Classes
TraversableLike → GenTraversableLike → GenTraversableOnce
def iterator: Iterator[A]

Returns the elements in the list as an iterator
Returns the elements in the list as an iterator
returns
the new iterator

Definition Classes
Queue → LinearSeqLike → IterableLike → GenIterableLike
def last: A

Selects the last element.
Selects the last element.
returns
The last element of this immutable queue.

Definition Classes
TraversableLike → GenTraversableLike
Exceptions thrown
NoSuchElementException
If the immutable queue is empty.
def lastIndexOf(elem: A, end: Int): Int

[use case] Finds index of last occurrence of some value in this immutable queue before or at a given end index.
[use case]
Finds index of last occurrence of some value in this immutable queue 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 immutable queue that is equal (as determined by ==) to elem, or -1, if none exists.

Definition Classes
GenSeqLike
Full Signature
def lastIndexOf[B >: A](elem: B, end: Int): Int
def lastIndexOf(elem: A): Int

[use case] Finds index of last occurrence of some value in this immutable queue.
[use case]
Finds index of last occurrence of some value in this immutable queue.
elem
the element value to search for.
returns
the index of the last element of this immutable queue that is equal (as determined by ==) to elem, or -1, if none exists.

Definition Classes
GenSeqLike
Full Signature
def lastIndexOf[B >: A](elem: B): Int
def lastIndexOfSlice[B >: A](that: GenSeq[B], end: Int): Int

Finds last index before or at a given end index where this immutable queue contains a given sequence as a slice.
Finds last index before or at a given end index where this immutable queue contains a given sequence as a slice.
that
the sequence to test
end
the end index
returns
the last index <= end such that the elements of this immutable queue starting at this index match the elements of sequence that, or -1 of no such subsequence exists.

Definition Classes
SeqLike
def lastIndexOfSlice[B >: A](that: GenSeq[B]): Int

Finds last index where this immutable queue contains a given sequence as a slice.
Finds last index where this immutable queue contains a given sequence as a slice.
that
the sequence to test
returns
the last index such that the elements of this immutable queue starting a this index match the elements of sequence that, or -1 of no such subsequence exists.

Definition Classes
SeqLike
def lastIndexWhere(p: (A) ⇒ Boolean, end: Int): Int

Finds index of last element satisfying some predicate before or at given end index.
Finds index of last element satisfying some predicate before or at given end index.
p
the predicate used to test elements.
returns
the index <= end of the last element of this immutable queue that satisfies the predicate p, or -1, if none exists.

Definition Classes
SeqLike → GenSeqLike
def lastIndexWhere(p: (A) ⇒ Boolean): Int

Finds index of last element satisfying some predicate.
Finds index of last element satisfying some predicate.
p
the predicate used to test elements.
returns
the index of the last element of this immutable queue that satisfies the predicate p, or -1, if none exists.

Definition Classes
GenSeqLike
def lastOption: Option[A]

Optionally selects the last element.
Optionally selects the last element.
returns
the last element of this immutable queue$ if it is nonempty, None if it is empty.

Definition Classes
TraversableLike → GenTraversableLike
def length: Int

Returns the length of the queue.
Returns the length of the queue.
returns
the number of elements in this immutable queue.

Definition Classes
Queue → SeqLike → GenSeqLike
def lengthCompare(len: Int): Int

Compares the length of this immutable queue to a test value.
Compares the length of this immutable queue to a test value.
len
the test value that gets compared with the length.
returns
A value x where
```
x <  0       if this.length <  len
x == 0       if this.length == len
x >  0       if this.length >  len
```
The method as implemented here does not call length directly; its running time is O(length min len) instead of O(length). The method should be overwritten if computing length is cheap.
Definition Classes
SeqLike
def lift: (Int) ⇒ Option[A]

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

Definition Classes
PartialFunction
See also
Function.unlift
def map[B](f: (A) ⇒ B): Queue[B]

[use case] Builds a new collection by applying a function to all elements of this immutable queue.
[use case]
Builds a new collection by applying a function to all elements of this immutable queue.
B
the element type of the returned collection.
f
the function to apply to each element.
returns
a new immutable queue resulting from applying the given function f to each element of this immutable queue and collecting the results.

Definition Classes
TraversableLike → GenTraversableLike → FilterMonadic
Full Signature
def map[B, That](f: (A) ⇒ B)(implicit bf: CanBuildFrom[Queue[A], B, That]): That
def max: A

[use case] Finds the largest element.
[use case]
Finds the largest element.
returns
the largest element of this immutable queue.

Definition Classes
TraversableOnce → GenTraversableOnce
Full Signature
def max[B >: A](implicit cmp: Ordering[B]): A
def maxBy[B](f: (A) ⇒ B)(implicit cmp: Ordering[B]): A

Definition Classes
TraversableOnce → GenTraversableOnce
def min: A

[use case] Finds the smallest element.
[use case]
Finds the smallest element.
returns
the smallest element of this immutable queue

Definition Classes
TraversableOnce → GenTraversableOnce
Full Signature
def min[B >: A](implicit cmp: Ordering[B]): A
def minBy[B](f: (A) ⇒ B)(implicit cmp: Ordering[B]): A

Definition Classes
TraversableOnce → GenTraversableOnce
def mkString: String

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

Definition Classes
TraversableOnce → GenTraversableOnce
def mkString(sep: String): String

Displays all elements of this immutable queue in a string using a separator string.
Displays all elements of this immutable queue in a string using a separator string.
sep
the separator string.
returns
a string representation of this immutable queue. In the resulting string the string representations (w.r.t. the method toString) of all elements of this immutable queue are separated by the string sep.
Definition Classes
TraversableOnce → GenTraversableOnce
Example:
1. List(1, 2, 3).mkString("|") = "1|2|3"
def mkString(start: String, sep: String, end: String): String

Displays all elements of this immutable queue in a string using start, end, and separator strings.
Displays all elements of this immutable queue in a string using start, end, and separator strings.
start
the starting string.
sep
the separator string.
end
the ending string.
returns
a string representation of this immutable queue. 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 queue are separated by the string sep.
Definition Classes
TraversableOnce → GenTraversableOnce
Example:
1. List(1, 2, 3).mkString("(", "; ", ")") = "(1; 2; 3)"
final def ne(arg0: AnyRef): Boolean

Definition Classes
AnyRef
def newBuilder: Builder[A, Queue[A]]

The builder that builds instances of type immutable.Queue[A]
The builder that builds instances of type immutable.Queue[A]

Attributes
protected[this]
Definition Classes
GenericTraversableTemplate → HasNewBuilder
def nonEmpty: Boolean

Tests whether the immutable queue is not empty.
Tests whether the immutable queue is not empty.
returns
true if the immutable queue contains at least one element, false otherwise.

Definition Classes
TraversableOnce → GenTraversableOnce
final def notify(): Unit

Definition Classes
AnyRef
final def notifyAll(): Unit

Definition Classes
AnyRef
def orElse[A1 <: Int, B1 >: A](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.
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.

Definition Classes
PartialFunction
val out: List[A]

Attributes
protected
def padTo(len: Int, elem: A): Queue[A]

[use case] A copy of this immutable queue with an element value appended until a given target length is reached.
[use case]
A copy of this immutable queue with an element value appended until a given target length is reached.
len
the target length
elem
the padding value
returns
a new immutable queue consisting of all elements of this immutable queue followed by the minimal number of occurrences of elem so that the resulting immutable queue has a length of at least len.

Definition Classes
SeqLike → GenSeqLike
Full Signature
def padTo[B >: A, That](len: Int, elem: B)(implicit bf: CanBuildFrom[Queue[A], B, That]): That
def par: ParSeq[A]

Returns a parallel implementation of this collection.
Returns a parallel implementation of this collection.
For most collection types, this method creates a new parallel collection by copying all the elements. For these collection, par takes linear time. Mutable collections in this category do not produce a mutable parallel collection that has the same underlying dataset, so changes in one collection will not be reflected in the other one.
Specific collections (e.g. ParArray or mutable.ParHashMap) override this default behaviour by creating a parallel collection which shares the same underlying dataset. For these collections, par takes constant or sublinear time.
All parallel collections return a reference to themselves.
returns
a parallel implementation of this collection

Definition Classes
Parallelizable
def parCombiner: Combiner[A, ParSeq[A]]

The default par implementation uses the combiner provided by this method to create a new parallel collection.
The default par implementation uses the combiner provided by this method to create a new parallel collection.
returns
a combiner for the parallel collection of type ParRepr

Attributes
protected[this]
Definition Classes
Seq → SeqLike → Iterable → TraversableLike → Parallelizable
def partition(p: (A) ⇒ Boolean): (Queue[A], Queue[A])

Partitions this immutable queue in two immutable queues according to a predicate.
Partitions this immutable queue in two immutable queues according to a predicate.
p
the predicate on which to partition.
returns
a pair of immutable queues: the first immutable queue consists of all elements that satisfy the predicate p and the second immutable queue consists of all elements that don't. The relative order of the elements in the resulting immutable queues is the same as in the original immutable queue.

Definition Classes
TraversableLike → GenTraversableLike
def patch(from: Int, that: GenSeq[A], replaced: Int): Queue[A]

[use case] Produces a new immutable queue where a slice of elements in this immutable queue is replaced by another sequence.
[use case]
Produces a new immutable queue where a slice of elements in this immutable queue is replaced by another sequence.
from
the index of the first replaced element
replaced
the number of elements to drop in the original immutable queue
returns
a new immutable queue consisting of all elements of this immutable queue except that replaced elements starting from from are replaced by patch.

Definition Classes
SeqLike → GenSeqLike
Full Signature
def patch[B >: A, That](from: Int, patch: GenSeq[B], replaced: Int)(implicit bf: CanBuildFrom[Queue[A], B, That]): That
def permutations: Iterator[Queue[A]]

Iterates over distinct permutations.
Iterates over distinct permutations.
returns
An Iterator which traverses the distinct permutations of this immutable queue.
Definition Classes
SeqLike
Example:
1. "abb".permutations = Iterator(abb, bab, bba)
def prefixLength(p: (A) ⇒ Boolean): Int

Returns the length of the longest prefix whose elements all satisfy some predicate.
Returns the length of the longest prefix whose elements all satisfy some predicate.
p
the predicate used to test elements.
returns
the length of the longest prefix of this immutable queue such that every element of the segment satisfies the predicate p.

Definition Classes
GenSeqLike
def product: A

[use case] Multiplies up the elements of this collection.
[use case]
Multiplies up the elements of this collection.
returns
the product of all elements in this immutable queue of numbers of type Int. Instead of Int, any other type T with an implicit Numeric[T] implementation can be used as element type of the immutable queue and as result type of product. Examples of such types are: Long, Float, Double, BigInt.

Definition Classes
TraversableOnce → GenTraversableOnce
Full Signature
def product[B >: A](implicit num: Numeric[B]): B
def reduce[A1 >: A](op: (A1, A1) ⇒ A1): A1

Reduces the elements of this immutable queue using the specified associative binary operator.
Reduces the elements of this immutable queue using the specified associative binary operator.
The order in which operations are performed on elements is unspecified and may be nondeterministic.
A1
A type parameter for the binary operator, a supertype of A.
op
A binary operator that must be associative.
returns
The result of applying reduce operator op between all the elements if the immutable queue is nonempty.

Definition Classes
TraversableOnce → GenTraversableOnce
Exceptions thrown
UnsupportedOperationException
if this immutable queue is empty.
def reduceLeft[B >: A](op: (B, A) ⇒ B): B

Applies a binary operator to all elements of this immutable queue, going left to right.
Applies a binary operator to all elements of this immutable queue, going left to right.
B
the result type of the binary operator.
op
the binary operator.
returns
the result of inserting op between consecutive elements of this immutable queue, going left to right:
```
op( op( ... op(x_1, x_2) ..., x_{n-1}), x_n)
```
where x₁, ..., x_n are the elements of this immutable queue.
Definition Classes
TraversableOnce
Exceptions thrown
`UnsupportedOperationException`
if this immutable queue is empty.
def reduceLeftOption[B >: A](op: (B, A) ⇒ B): Option[B]

Optionally applies a binary operator to all elements of this immutable queue, going left to right.
Optionally applies a binary operator to all elements of this immutable queue, going left to right.
B
the result type of the binary operator.
op
the binary operator.
returns
an option value containing the result of reduceLeft(op) is this immutable queue is nonempty, None otherwise.

Definition Classes
TraversableOnce → GenTraversableOnce
def reduceOption[A1 >: A](op: (A1, A1) ⇒ A1): Option[A1]

Reduces the elements of this immutable queue, if any, using the specified associative binary operator.
Reduces the elements of this immutable queue, if any, using the specified associative binary operator.
The order in which operations are performed on elements is unspecified and may be nondeterministic.
A1
A type parameter for the binary operator, a supertype of A.
op
A binary operator that must be associative.
returns
An option value containing result of applying reduce operator op between all the elements if the collection is nonempty, and None otherwise.

Definition Classes
TraversableOnce → GenTraversableOnce
def reduceRight[B >: A](op: (A, B) ⇒ B): B

Applies a binary operator to all elements of this immutable queue, going right to left.
Applies a binary operator to all elements of this immutable queue, going right to left.
B
the result type of the binary operator.
op
the binary operator.
returns
the result of inserting op between consecutive elements of this immutable queue, going right to left:
```
op(x_1, op(x_2, ..., op(x_{n-1}, x_n)...))
```
where x₁, ..., x_n are the elements of this immutable queue.
Definition Classes
IterableLike → TraversableOnce → GenTraversableOnce
Exceptions thrown
`UnsupportedOperationException`
if this immutable queue is empty.
def reduceRightOption[B >: A](op: (A, B) ⇒ B): Option[B]

Optionally applies a binary operator to all elements of this immutable queue, going right to left.
Optionally applies a binary operator to all elements of this immutable queue, going right to left.
B
the result type of the binary operator.
op
the binary operator.
returns
an option value containing the result of reduceRight(op) is this immutable queue is nonempty, None otherwise.

Definition Classes
TraversableOnce → GenTraversableOnce
def repr: Queue[A]

The collection of type immutable queue underlying this TraversableLike object.
The collection of type immutable queue underlying this TraversableLike object. By default this is implemented as the TraversableLike object itself, but this can be overridden.

Definition Classes
TraversableLike → GenTraversableLike
def reverse: Queue[A]

Returns new immutable queue wih elements in reversed order.
Returns new immutable queue wih elements in reversed order.
returns
A new immutable queue with all elements of this immutable queue in reversed order.

Definition Classes
SeqLike → GenSeqLike
def reverseIterator: Iterator[A]

An iterator yielding elements in reversed order.
An iterator yielding elements in reversed order.
Note: xs.reverseIterator is the same as xs.reverse.iterator but might be more efficient.
returns
an iterator yielding the elements of this immutable queue in reversed order

Definition Classes
SeqLike
def reverseMap[B](f: (A) ⇒ B): Queue[B]

[use case] Builds a new collection by applying a function to all elements of this immutable queue and collecting the results in reversed order.
[use case]
Builds a new collection by applying a function to all elements of this immutable queue and collecting the results in reversed order.
Note: xs.reverseMap(f) is the same as xs.reverse.map(f) but might be more efficient.
B
the element type of the returned collection.
f
the function to apply to each element.
returns
a new immutable queue resulting from applying the given function f to each element of this immutable queue and collecting the results in reversed order.

Definition Classes
SeqLike → GenSeqLike
Full Signature
def reverseMap[B, That](f: (A) ⇒ B)(implicit bf: CanBuildFrom[Queue[A], B, That]): That
def reversed: scala.List[A]

Attributes
protected[this]
Definition Classes
TraversableOnce
def runWith[U](action: (A) ⇒ U): (Int) ⇒ Boolean

Composes this partial function with an action function which gets applied to results of this partial function.
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.

Definition Classes
PartialFunction
Since
2.10
See also
applyOrElse.
def sameElements(that: GenIterable[A]): Boolean

[use case] Checks if the other iterable collection contains the same elements in the same order as this immutable queue.
[use case]
Checks if the other iterable collection contains the same elements in the same order as this immutable queue.
that
the collection to compare with.
returns
true, if both collections contain the same elements in the same order, false otherwise.

Definition Classes
IterableLike → GenIterableLike
Full Signature
def sameElements[B >: A](that: GenIterable[B]): Boolean
def scan[B >: A, That](z: B)(op: (B, B) ⇒ B)(implicit cbf: CanBuildFrom[Queue[A], B, That]): That

Computes a prefix scan of the elements of the collection.
Computes a prefix scan of the elements of the collection.
Note: The neutral element z may be applied more than once.
B
element type of the resulting collection
That
type of the resulting collection
z
neutral element for the operator op
op
the associative operator for the scan
cbf
combiner factory which provides a combiner
returns
a new immutable queue containing the prefix scan of the elements in this immutable queue

Definition Classes
TraversableLike → GenTraversableLike
def scanLeft[B, That](z: B)(op: (B, A) ⇒ B)(implicit bf: CanBuildFrom[Queue[A], B, That]): That

Produces a collection containing cumulative results of applying the operator going left to right.
Produces a collection containing cumulative results of applying the operator going left to right.
B
the type of the elements in the resulting collection
That
the actual type of the resulting collection
z
the initial value
op
the binary operator applied to the intermediate result and the element
bf
an implicit value of class CanBuildFrom which determines the result class That from the current representation type Repr and the new element type B.
returns
collection with intermediate results

Definition Classes
TraversableLike → GenTraversableLike
def scanRight[B, That](z: B)(op: (A, B) ⇒ B)(implicit bf: CanBuildFrom[Queue[A], B, That]): That

Produces a collection containing cumulative results of applying the operator going right to left.
Produces a collection containing cumulative results of applying the operator going right to left. The head of the collection is the last cumulative result.
Example:
```
List(1, 2, 3, 4).scanRight(0)(_ + _) == List(10, 9, 7, 4, 0)
```
B
the type of the elements in the resulting collection
That
the actual type of the resulting collection
z
the initial value
op
the binary operator applied to the intermediate result and the element
bf
an implicit value of class CanBuildFrom which determines the result class That from the current representation type Repr and the new element type B.
returns
collection with intermediate results

Definition Classes
TraversableLike → GenTraversableLike
Annotations
@migration
Migration
(Changed in version 2.9.0) The behavior of scanRight has changed. The previous behavior can be reproduced with scanRight.reverse.
def segmentLength(p: (A) ⇒ Boolean, from: Int): Int

Computes length of longest segment whose elements all satisfy some predicate.
Computes length of longest segment whose elements all satisfy some predicate.
p
the predicate used to test elements.
from
the index where the search starts.
returns
the length of the longest segment of this immutable queue starting from index from such that every element of the segment satisfies the predicate p.

Definition Classes
SeqLike → GenSeqLike
def seq: LinearSeq[A]

A version of this collection with all of the operations implemented sequentially (i.
A version of this collection with all of the operations implemented sequentially (i.e. in a single-threaded manner).
This method returns a reference to this collection. In parallel collections, it is redefined to return a sequential implementation of this collection. In both cases, it has O(1) complexity.
returns
a sequential view of the collection.

Definition Classes
LinearSeq → LinearSeq → LinearSeqLike → Seq → Seq → GenSeq → GenSeqLike → Iterable → Iterable → GenIterable → Traversable → Traversable → GenTraversable → Parallelizable → TraversableOnce → GenTraversableOnce
def size: Int

The size of this immutable queue, equivalent to length.
The size of this immutable queue, equivalent to length.
returns
the number of elements in this immutable queue.

Definition Classes
SeqLike → GenTraversableLike → TraversableOnce → GenTraversableOnce
def slice(from: Int, until: Int): Queue[A]

Selects an interval of elements.
Selects an interval of elements. The returned collection is made up of all elements x which satisfy the invariant:
```
from <= indexOf(x) < until
```
returns
a immutable queue containing the elements greater than or equal to index from extending up to (but not including) index until of this immutable queue.

Definition Classes
IterableLike → TraversableLike → GenTraversableLike
def sliding(size: Int, step: Int): Iterator[Queue[A]]

Groups elements in fixed size blocks by passing a "sliding window" over them (as opposed to partitioning them, as is done in grouped.
Groups elements in fixed size blocks by passing a "sliding window" over them (as opposed to partitioning them, as is done in grouped.)
size
the number of elements per group
step
the distance between the first elements of successive groups (defaults to 1)
returns
An iterator producing immutable queues of size size, except the last and the only element will be truncated if there are fewer elements than size.

Definition Classes
IterableLike
See also
scala.collection.Iterator, method sliding
def sliding(size: Int): Iterator[Queue[A]]

Groups elements in fixed size blocks by passing a "sliding window" over them (as opposed to partitioning them, as is done in grouped.
Groups elements in fixed size blocks by passing a "sliding window" over them (as opposed to partitioning them, as is done in grouped.)
size
the number of elements per group
returns
An iterator producing immutable queues of size size, except the last and the only element will be truncated if there are fewer elements than size.

Definition Classes
IterableLike
See also
scala.collection.Iterator, method sliding
def sortBy[B](f: (A) ⇒ B)(implicit ord: math.Ordering[B]): Queue[A]

Sorts this immutable.Queue according to the Ordering which results from transforming an implicitly given Ordering with a transformation function.
Sorts this immutable.Queue according to the Ordering which results from transforming an implicitly given Ordering with a transformation function.
B
the target type of the transformation f, and the type where the ordering ord is defined.
f
the transformation function mapping elements to some other domain B.
ord
the ordering assumed on domain B.
returns
a immutable queue consisting of the elements of this immutable queue sorted according to the ordering where x < y if ord.lt(f(x), f(y)).
Definition Classes
SeqLike
Example:
1. val words = "The quick brown fox jumped over the lazy dog".split(' ') // this works because scala.Ordering will implicitly provide an Ordering[Tuple2[Int, Char]] words.sortBy(x => (x.length, x.head)) res0: Array[String] = Array(The, dog, fox, the, lazy, over, brown, quick, jumped)
See also
scala.math.Ordering
def sortWith(lt: (A, A) ⇒ Boolean): Queue[A]

Sorts this immutable queue according to a comparison function.
Sorts this immutable queue according to a comparison function.
The sort is stable. That is, elements that are equal (as determined by lt) appear in the same order in the sorted sequence as in the original.
lt
the comparison function which tests whether its first argument precedes its second argument in the desired ordering.
returns
a immutable queue consisting of the elements of this immutable queue sorted according to the comparison function lt.
Definition Classes
SeqLike
Example:
1. List("Steve", "Tom", "John", "Bob").sortWith(_.compareTo(_) < 0) = List("Bob", "John", "Steve", "Tom")
def sorted[B >: A](implicit ord: math.Ordering[B]): Queue[A]

Sorts this immutable queue according to an Ordering.
Sorts this immutable queue according to an Ordering.
The sort is stable. That is, elements that are equal (as determined by lt) appear in the same order in the sorted sequence as in the original.
ord
the ordering to be used to compare elements.
returns
a immutable queue consisting of the elements of this immutable queue sorted according to the ordering ord.

Definition Classes
SeqLike
See also
scala.math.Ordering
def span(p: (A) ⇒ Boolean): (Queue[A], Queue[A])

Splits this immutable queue into a prefix/suffix pair according to a predicate.
Splits this immutable queue into a prefix/suffix pair according to a predicate.
Note: c span p is equivalent to (but possibly more efficient than) (c takeWhile p, c dropWhile p), provided the evaluation of the predicate p does not cause any side-effects.
returns
a pair consisting of the longest prefix of this immutable queue whose elements all satisfy p, and the rest of this immutable queue.

Definition Classes
TraversableLike → GenTraversableLike
def splitAt(n: Int): (Queue[A], Queue[A])

Splits this immutable queue into two at a given position.
Splits this immutable queue into two at a given position. Note: c splitAt n is equivalent to (but possibly more efficient than) (c take n, c drop n).
n
the position at which to split.
returns
a pair of immutable queues consisting of the first n elements of this immutable queue, and the other elements.

Definition Classes
TraversableLike → GenTraversableLike
def startsWith[B](that: GenSeq[B], offset: Int): Boolean

Tests whether this immutable queue contains the given sequence at a given index.
Tests whether this immutable queue 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 queue at index offset, otherwise false.

Definition Classes
SeqLike → GenSeqLike
def startsWith[B](that: GenSeq[B]): Boolean

Tests whether this immutable queue starts with the given sequence.
Tests whether this immutable queue starts with the given sequence.
that
the sequence to test
returns
true if this collection has that as a prefix, false otherwise.

Definition Classes
GenSeqLike
def stringPrefix: String

Defines the prefix of this object's toString representation.
Defines the prefix of this object's toString representation.
returns
a string representation which starts the result of toString applied to this immutable queue. By default the string prefix is the simple name of the collection class immutable queue.

Definition Classes
TraversableLike → GenTraversableLike
def sum: A

[use case] Sums up the elements of this collection.
[use case]
Sums up the elements of this collection.
returns
the sum of all elements in this immutable queue of numbers of type Int. Instead of Int, any other type T with an implicit Numeric[T] implementation can be used as element type of the immutable queue and as result type of sum. Examples of such types are: Long, Float, Double, BigInt.

Definition Classes
TraversableOnce → GenTraversableOnce
Full Signature
def sum[B >: A](implicit num: Numeric[B]): B
final def synchronized[T0](arg0: ⇒ T0): T0

Definition Classes
AnyRef
def tail: Queue[A]

Selects all elements except the first.
Selects all elements except the first.
returns
a immutable queue consisting of all elements of this immutable queue except the first one.

Definition Classes
Queue → TraversableLike → GenTraversableLike
Exceptions thrown
`UnsupportedOperationException`
if the immutable queue is empty.
def tails: Iterator[Queue[A]]

Iterates over the tails of this immutable queue.
Iterates over the tails of this immutable queue. The first value will be this immutable queue and the final one will be an empty immutable queue, with the intervening values the results of successive applications of tail.
returns
an iterator over all the tails of this immutable queue
Definition Classes
TraversableLike
Example:
1. List(1,2,3).tails = Iterator(List(1,2,3), List(2,3), List(3), Nil)
def take(n: Int): Queue[A]

Selects first n elements.
Selects first n elements.
n
the number of elements to take from this immutable queue.
returns
a immutable queue consisting only of the first n elements of this immutable queue, or else the whole immutable queue, if it has less than n elements.

Definition Classes
IterableLike → TraversableLike → GenTraversableLike
def takeRight(n: Int): Queue[A]

Selects last n elements.
Selects last n elements.
n
the number of elements to take
returns
a immutable queue consisting only of the last n elements of this immutable queue, or else the whole immutable queue, if it has less than n elements.

Definition Classes
IterableLike
def takeWhile(p: (A) ⇒ Boolean): Queue[A]

Takes longest prefix of elements that satisfy a predicate.
Takes longest prefix of elements that satisfy a predicate.
returns
the longest prefix of this immutable queue whose elements all satisfy the predicate p.

Definition Classes
IterableLike → TraversableLike → GenTraversableLike
def thisCollection: collection.LinearSeq[A]

The underlying collection seen as an instance of immutable.Queue.
The underlying collection seen as an instance of immutable.Queue. By default this is implemented as the current collection object itself, but this can be overridden.

Attributes
protected[this]
Definition Classes
LinearSeqLike → SeqLike → IterableLike → TraversableLike
def to[Col[_]]: Col[A]

[use case] Converts this immutable queue into another by copying all elements.
[use case]
Converts this immutable queue into another by copying all elements.
Col
The collection type to build.
returns
a new collection containing all elements of this immutable queue.

Definition Classes
TraversableLike → TraversableOnce → GenTraversableOnce
Full Signature
def to[Col[_]](implicit cbf: CanBuildFrom[Nothing, A, Col[A]]): Col[A]
def toArray: Array[A]

[use case] Converts this immutable queue to an array.
[use case]
Converts this immutable queue to an array.
returns
an array containing all elements of this immutable queue. An ClassTag must be available for the element type of this immutable queue.

Definition Classes
TraversableOnce → GenTraversableOnce
Full Signature
def toArray[B >: A](implicit arg0: ClassTag[B]): Array[B]
def toBuffer[B >: A]: Buffer[B]

Converts this immutable queue to a mutable buffer.
Converts this immutable queue to a mutable buffer.
returns
a buffer containing all elements of this immutable queue.

Definition Classes
TraversableOnce → GenTraversableOnce
def toCollection(repr: Queue[A]): collection.LinearSeq[A]

A conversion from collections of type Repr to immutable.Queue objects.
A conversion from collections of type Repr to immutable.Queue objects. By default this is implemented as just a cast, but this can be overridden.

Attributes
protected[this]
Definition Classes
LinearSeqLike → SeqLike → IterableLike → TraversableLike
def toIndexedSeq: IndexedSeq[A]

Converts this immutable queue to an indexed sequence.
Converts this immutable queue to an indexed sequence.
returns
an indexed sequence containing all elements of this immutable queue.

Definition Classes
TraversableOnce → GenTraversableOnce
def toIterable: collection.Iterable[A]

Converts this immutable queue to an iterable collection.
Converts this immutable queue to an iterable collection. Note that the choice of target Iterable is lazy in this default implementation as this TraversableOnce may be lazy and unevaluated (i.e. it may be an iterator which is only traversable once).
returns
an Iterable containing all elements of this immutable queue.

Definition Classes
IterableLike → TraversableOnce → GenTraversableOnce
def toIterator: Iterator[A]

Returns an Iterator over the elements in this immutable queue.
Returns an Iterator over the elements in this immutable queue. Will return the same Iterator if this instance is already an Iterator.
returns
an Iterator containing all elements of this immutable queue.

Definition Classes
IterableLike → TraversableLike → GenTraversableOnce
def toList: scala.List[A]

Converts this immutable queue to a list.
Converts this immutable queue to a list.
returns
a list containing all elements of this immutable queue.

Definition Classes
TraversableOnce → GenTraversableOnce
def toMap[T, U]: collection.Map[T, U]

[use case] Converts this immutable queue to a map.
[use case]
Converts this immutable queue to a map. This method is unavailable unless the elements are members of Tuple2, each ((T, U)) becoming a key-value pair in the map. Duplicate keys will be overwritten by later keys: if this is an unordered collection, which key is in the resulting map is undefined.
returns
a map of type immutable.Map[T, U] containing all key/value pairs of type (T, U) of this immutable queue.

Definition Classes
TraversableOnce → GenTraversableOnce
Full Signature
def toMap[T, U](implicit ev: <:<[A, (T, U)]): Map[T, U]
def toParArray: ParArray[A]

Implicit information
This member is added by an implicit conversion from Queue[A] to TraversableOps[A] performed by method traversable2ops in scala.collection.parallel.
Definition Classes
TraversableOps
def toSeq: Seq[A]

Converts this immutable queue to a sequence.
Converts this immutable queue to a sequence.
Overridden for efficiency.
returns
a sequence containing all elements of this immutable queue.

Definition Classes
Seq → SeqLike → GenSeqLike → TraversableOnce → GenTraversableOnce
def toSet[B >: A]: Set[B]

Converts this immutable queue to a set.
Converts this immutable queue to a set.
returns
a set containing all elements of this immutable queue.

Definition Classes
TraversableOnce → GenTraversableOnce
def toStream: Stream[A]

Converts this immutable queue to a stream.
Converts this immutable queue to a stream.
returns
a stream containing all elements of this immutable queue.

Definition Classes
IterableLike → TraversableLike → GenTraversableOnce
def toString(): String

Returns a string representation of this queue.
Returns a string representation of this queue.
returns
a string representation of this collection. By default this string consists of the stringPrefix of this immutable queue, followed by all elements separated by commas and enclosed in parentheses.

Definition Classes
Queue → SeqLike → Function1 → TraversableLike → AnyRef → Any
def toTraversable: collection.Traversable[A]

Converts this immutable queue to an unspecified Traversable.
Converts this immutable queue to an unspecified Traversable. Will return the same collection if this instance is already Traversable.
returns
a Traversable containing all elements of this immutable queue.

Definition Classes
TraversableLike → TraversableOnce → GenTraversableOnce
def toVector: scala.Vector[A]

Converts this immutable queue to a Vector.
Converts this immutable queue to a Vector.
returns
a vector containing all elements of this immutable queue.

Definition Classes
TraversableOnce → GenTraversableOnce
def transpose[B](implicit asTraversable: (A) ⇒ GenTraversableOnce[B]): Queue[Queue[B]]

Transposes this immutable queue of traversable collections into a immutable queue of immutable queues.
Transposes this immutable queue of traversable collections into a immutable queue of immutable queues.
B
the type of the elements of each traversable collection.
asTraversable
an implicit conversion which asserts that the element type of this immutable queue is a Traversable.
returns
a two-dimensional immutable queue of immutable queues which has as nth row the nth column of this immutable queue.

Definition Classes
GenericTraversableTemplate
Annotations
@migration
Migration
(Changed in version 2.9.0) transpose throws an IllegalArgumentException if collections are not uniformly sized.
Exceptions thrown
`IllegalArgumentException`
if all collections in this immutable queue are not of the same size.
def union(that: collection.Seq[A]): Queue[A]

[use case] Produces a new sequence which contains all elements of this immutable queue and also all elements of a given sequence.
[use case]
Produces a new sequence which contains all elements of this immutable queue and also all elements of a given sequence. xs union ys is equivalent to xs ++ ys.
Another way to express this is that xs union ys computes the order-presevring multi-set union of xs and ys. union is hence a counter-part of diff and intersect which also work on multi-sets.
that
the sequence to add.
returns
a new immutable queue which contains all elements of this immutable queue followed by all elements of that.

Definition Classes
SeqLike → GenSeqLike
Full Signature
def union[B >: A, That](that: GenSeq[B])(implicit bf: CanBuildFrom[Queue[A], B, That]): That
def unzip[A1, A2](implicit asPair: (A) ⇒ (A1, A2)): (Queue[A1], Queue[A2])

Converts this immutable queue of pairs into two collections of the first and second half of each pair.
Converts this immutable queue of pairs into two collections of the first and second half of each pair.
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 queue is a pair.
returns
a pair immutable queues, containing the first, respectively second half of each element pair of this immutable queue.

Definition Classes
GenericTraversableTemplate
def unzip3[A1, A2, A3](implicit asTriple: (A) ⇒ (A1, A2, A3)): (Queue[A1], Queue[A2], Queue[A3])

Converts this immutable queue of triples into three collections of the first, second, and third element of each triple.
Converts this immutable queue of triples into three collections of the first, second, and third element of each triple.
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 queue is a triple.
returns
a triple immutable queues, containing the first, second, respectively third member of each element triple of this immutable queue.

Definition Classes
GenericTraversableTemplate
def updated(index: Int, elem: A): Queue[A]

[use case] A copy of this immutable queue with one single replaced element.
[use case]
A copy of this immutable queue with one single replaced element.
index
the position of the replacement
elem
the replacing element
returns
a copy of this immutable queue with the element at position index replaced by elem.

Definition Classes
SeqLike → GenSeqLike
Full Signature
def updated[B >: A, That](index: Int, elem: B)(implicit bf: CanBuildFrom[Queue[A], B, That]): That
def view(from: Int, until: Int): SeqView[A, Queue[A]]

Creates a non-strict view of a slice of this immutable queue.
Creates a non-strict view of a slice of this immutable queue.
Note: the difference between view and slice is that view produces a view of the current immutable queue, whereas slice produces a new immutable queue.
Note: view(from, to) is equivalent to view.slice(from, to)
from
the index of the first element of the view
until
the index of the element following the view
returns
a non-strict view of a slice of this immutable queue, starting at index from and extending up to (but not including) index until.

Definition Classes
SeqLike → IterableLike → TraversableLike
def view: SeqView[A, Queue[A]]

Creates a non-strict view of this immutable queue.
Creates a non-strict view of this immutable queue.
returns
a non-strict view of this immutable queue.

Definition Classes
SeqLike → IterableLike → TraversableLike
final def wait(): Unit

Definition Classes
AnyRef
Annotations
@throws()
final def wait(arg0: Long, arg1: Int): Unit

Definition Classes
AnyRef
Annotations
@throws()
final def wait(arg0: Long): Unit

Definition Classes
AnyRef
Annotations
@throws()
def withFilter(p: (A) ⇒ Boolean): FilterMonadic[A, Queue[A]]

Creates a non-strict filter of this immutable queue.
Creates a non-strict filter of this immutable queue.
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 queue which satisfy the predicate p.

Definition Classes
TraversableLike → FilterMonadic
def zip[B](that: GenIterable[B]): Queue[(A, B)]

[use case] Returns a immutable queue formed from this immutable queue and another iterable collection by combining corresponding elements in pairs.
[use case]
Returns a immutable queue formed from this immutable queue 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 queue containing pairs consisting of corresponding elements of this immutable queue and that. The length of the returned collection is the minimum of the lengths of this immutable queue and that.

Definition Classes
IterableLike → GenIterableLike
Full Signature
def zip[A1 >: A, B, That](that: GenIterable[B])(implicit bf: CanBuildFrom[Queue[A], (A1, B), That]): That
def zipAll[B](that: collection.Iterable[B], thisElem: A, thatElem: B): Queue[(A, B)]

[use case] Returns a immutable queue formed from this immutable queue and another iterable collection by combining corresponding elements in pairs.
[use case]
Returns a immutable queue formed from this immutable queue and another iterable collection by combining corresponding elements in pairs. If one of the two collections is shorter than the other, placeholder elements are used to extend the shorter collection to the length of the longer.
B
the type of the second half of the returned pairs
that
The iterable providing the second half of each result pair
thisElem
the element to be used to fill up the result if this immutable queue is shorter than that.
thatElem
the element to be used to fill up the result if that is shorter than this immutable queue.
returns
a new immutable queue containing pairs consisting of corresponding elements of this immutable queue and that. The length of the returned collection is the maximum of the lengths of this immutable queue and that. If this immutable queue is shorter than that, thisElem values are used to pad the result. If that is shorter than this immutable queue, thatElem values are used to pad the result.

Definition Classes
IterableLike → GenIterableLike
Full Signature
def zipAll[B, A1 >: A, That](that: GenIterable[B], thisElem: A1, thatElem: B)(implicit bf: CanBuildFrom[Queue[A], (A1, B), That]): That
def zipWithIndex: Queue[(A, Int)]

[use case] Zips this immutable queue with its indices.
[use case]
Zips this immutable queue with its indices.
returns
A new immutable queue containing pairs consisting of all elements of this immutable queue paired with their index. Indices start at 0.
Definition Classes
IterableLike → GenIterableLike
Full Signature
def zipWithIndex[A1 >: A, That](implicit bf: CanBuildFrom[Queue[A], (A1, Int), That]): That
Example:
1. List("a", "b", "c").zipWithIndex = List(("a", 0), ("b", 1), ("c", 2))
def →[B](y: B): (Queue[A], B)

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

Shadowed Implicit Value Members

def filter(p: (A) ⇒ Boolean): TraversableOnce[A]
Implicit information
This member is added by an implicit conversion from Queue[A] to MonadOps[A] performed by method MonadOps in scala.collection.TraversableOnce.
Shadowing
This implicitly inherited member is shadowed by one or more members in this class.
To access this member you can use a type ascription:
(queue: MonadOps[A]).filter(p)
Definition Classes
MonadOps
def flatMap[B](f: (A) ⇒ GenTraversableOnce[B]): TraversableOnce[B]
Implicit information
This member is added by an implicit conversion from Queue[A] to MonadOps[A] performed by method MonadOps in scala.collection.TraversableOnce.
Shadowing
This implicitly inherited member is shadowed by one or more members in this class.
To access this member you can use a type ascription:
(queue: MonadOps[A]).flatMap(f)
Definition Classes
MonadOps
def map[B](f: (A) ⇒ B): TraversableOnce[B]
Implicit information
This member is added by an implicit conversion from Queue[A] to MonadOps[A] performed by method MonadOps in scala.collection.TraversableOnce.
Shadowing
This implicitly inherited member is shadowed by one or more members in this class.
To access this member you can use a type ascription:
(queue: MonadOps[A]).map(f)
Definition Classes
MonadOps
def withFilter(p: (A) ⇒ Boolean): Iterator[A]
Implicit information
This member is added by an implicit conversion from Queue[A] to MonadOps[A] performed by method MonadOps in scala.collection.TraversableOnce.
Shadowing
This implicitly inherited member is shadowed by one or more members in this class.
To access this member you can use a type ascription:
(queue: MonadOps[A]).withFilter(p)
Definition Classes
MonadOps

Inherited from Serializable

Inherited from java.io.Serializable

Inherited from LinearSeq[A]

Inherited from collection.LinearSeq[A]

Inherited from LinearSeqLike[A, Queue[A]]

Inherited from Seq[A]

Inherited from Iterable[A]

Inherited from Traversable[A]

Inherited from Immutable

Inherited from AbstractSeq[A]

Inherited from collection.Seq[A]

Inherited from SeqLike[A, Queue[A]]

Inherited from GenSeq[A]

Inherited from GenSeqLike[A, Queue[A]]

Inherited from PartialFunction[Int, A]

Inherited from (Int) ⇒ A

Inherited from AbstractIterable[A]

Inherited from collection.Iterable[A]

Inherited from IterableLike[A, Queue[A]]

Inherited from Equals

Inherited from GenIterable[A]

Inherited from GenIterableLike[A, Queue[A]]

Inherited from AbstractTraversable[A]

Inherited from collection.Traversable[A]

Inherited from GenTraversable[A]

Inherited from GenericTraversableTemplate[A, Queue]

Inherited from TraversableLike[A, Queue[A]]

Inherited from GenTraversableLike[A, Queue[A]]

Inherited from Parallelizable[A, ParSeq[A]]

Inherited from TraversableOnce[A]

Inherited from GenTraversableOnce[A]

Inherited from FilterMonadic[A, Queue[A]]

Inherited from HasNewBuilder[A, scala.collection.immutable.Queue[A] @scala.annotation.unchecked.uncheckedVariance]

Inherited from AnyRef

Inherited from Any

Inherited by implicit conversion traversable2ops from Queue[A] to TraversableOps[A]

Inherited by implicit conversion MonadOps from Queue[A] to MonadOps[A]

Inherited by implicit conversion StringAdd from Queue[A] to StringAdd[Queue[A]]

Inherited by implicit conversion StringFormat from Queue[A] to StringFormat[Queue[A]]

Inherited by implicit conversion Ensuring from Queue[A] to Ensuring[Queue[A]]

Inherited by implicit conversion ArrowAssoc from Queue[A] to ArrowAssoc[Queue[A]]

Inherited by implicit conversion alternateImplicit from Queue[A] to ForceImplicitAmbiguity

Ungrouped

class Queue[+A] extends AbstractSeq[A] with LinearSeq[A] with GenericTraversableTemplate[A, Queue] with LinearSeqLike[A, Queue[A]] with Serializable

Instance Constructors

new Queue(in: List[A], out: List[A])

Type Members

type Self = Queue[A]

class WithFilter extends FilterMonadic[A, Repr]

Value Members

final def !=(arg0: AnyRef): Boolean

final def !=(arg0: Any): Boolean

final def ##(): Int

def +(other: String): String

def ++[B](that: GenTraversableOnce[B]): Queue[B]

def ++[B >: A, That](that: GenTraversableOnce[B])(implicit bf: CanBuildFrom[Queue[A], B, That]): That

def ++:[B >: A, That](that: collection.Traversable[B])(implicit bf: CanBuildFrom[Queue[A], B, That]): That

def ++:[B](that: TraversableOnce[B]): Queue[B]

def ++:[B >: A, That](that: TraversableOnce[B])(implicit bf: CanBuildFrom[Queue[A], B, That]): That

def +:(elem: A): Queue[A]

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

def ->[B](y: B): (Queue[A], B)

def /:[B](z: B)(op: (B, A) ⇒ B): B

def :+(elem: A): Queue[A]

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

def :\[B](z: B)(op: (A, B) ⇒ B): B

final def ==(arg0: AnyRef): Boolean

final def ==(arg0: Any): Boolean

def addString(b: StringBuilder): StringBuilder

def addString(b: StringBuilder, sep: String): StringBuilder

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

def aggregate[B](z: ⇒ B)(seqop: (B, A) ⇒ B, combop: (B, B) ⇒ B): B

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

def apply(n: Int): A

def applyOrElse[A1 <: Int, B1 >: A](x: A1, default: (A1) ⇒ B1): B1

final def asInstanceOf[T0]: T0

def asParIterable: ParIterable[A]

def asParSeq: ParSeq[A]

def canEqual(that: Any): Boolean

def clone(): AnyRef

def collect[B](pf: PartialFunction[A, B]): Queue[B]

def collect[B, That](pf: PartialFunction[A, B])(implicit bf: CanBuildFrom[Queue[A], B, That]): That

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

def combinations(n: Int): Iterator[Queue[A]]

def companion: GenericCompanion[Queue]

def compose[A](g: (A) ⇒ Int): (A) ⇒ A

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

def containsSlice[B](that: GenSeq[B]): Boolean

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

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

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

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

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

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

def copyToBuffer[B >: A](dest: Buffer[B]): Unit

final def corresponds[B](that: GenSeq[B])(p: (A, B) ⇒ Boolean): Boolean

def count(p: (A) ⇒ Boolean): Int

def dequeue: (A, Queue[A])

def diff(that: collection.Seq[A]): Queue[A]

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

def distinct: Queue[A]

def drop(n: Int): Queue[A]

def dropRight(n: Int): Queue[A]

def dropWhile(p: (A) ⇒ Boolean): Queue[A]

def endsWith[B](that: GenSeq[B]): Boolean

def enqueue[B >: A](iter: Iterable[B]): Queue[B]

def enqueue[B >: A](elem: B): Queue[B]

def ensuring(cond: (Queue[A]) ⇒ Boolean, msg: ⇒ Any): Queue[A]

def ensuring(cond: (Queue[A]) ⇒ Boolean): Queue[A]

def ensuring(cond: Boolean, msg: ⇒ Any): Queue[A]

def ensuring(cond: Boolean): Queue[A]

final def eq(arg0: AnyRef): Boolean

def equals(that: Any): Boolean

def exists(p: (A) ⇒ Boolean): Boolean

def filter(p: (A) ⇒ Boolean): Queue[A]

def filterNot(p: (A) ⇒ Boolean): Queue[A]

def finalize(): Unit

def find(p: (A) ⇒ Boolean): Option[A]

def flatMap[B](f: (A) ⇒ GenTraversableOnce[B]): Queue[B]

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

def flatten[B]: Queue[B]

def flatten[B](implicit asTraversable: (A) ⇒ GenTraversableOnce[B]): Queue[B]