scala.collection.mutable

# Queue

#### class Queue[A] extends MutableList[A] with GenericTraversableTemplate[A, Queue] with Cloneable[Queue[A]] with Serializable

`Queue` objects implement data structures that allow to insert and retrieve elements in a first-in-first-out (FIFO) manner.

Annotations
  @cloneable()
Source
  Queue.scala
Version

  2.8

Since

  1

See also

  "Scala's Collection Library overview" section on `Queues` for more information.

Linear Supertypes
MutableList[A], Serializable, Serializable, Builder[A, MutableList[A]], Growable[A], LinearSeqOptimized[A, MutableList[A]], LinearSeq[A], LinearSeq[A], LinearSeqLike[A, MutableList[A]], Seq[A], SeqLike[A, Seq[A]], Cloneable[Queue[A]], Seq[A], SeqLike[A, MutableList[A]], GenSeq[A], GenSeqLike[A, MutableList[A]], PartialFunction[Int, A], (Int) ⇒ A, Iterable[A], Iterable[A], IterableLike[A, MutableList[A]], Equals, GenIterable[A], GenIterableLike[A, MutableList[A]], Traversable[A], Mutable, Traversable[A], GenTraversable[A], GenericTraversableTemplate[A, Queue], TraversableLike[A, MutableList[A]], GenTraversableLike[A, MutableList[A]], Parallelizable[A, ParSeq[A]], TraversableOnce[A], GenTraversableOnce[A], FilterMonadic[A, MutableList[A]], HasNewBuilder[A, Queue[A]], AnyRef, Any
Known Subclasses
QueueProxy, SynchronizedQueue
Ordering

1. Alphabetic
2. By inheritance

Inherited

1. Hide All
2. Show all

1. Queue
2. MutableList
3. Serializable
4. Serializable
5. Builder
6. Growable
7. LinearSeqOptimized
8. LinearSeq
9. LinearSeq
10. LinearSeqLike
11. Seq
12. SeqLike
13. Cloneable
14. Seq
15. SeqLike
16. GenSeq
17. GenSeqLike
18. PartialFunction
19. Function1
20. Iterable
21. Iterable
22. IterableLike
23. Equals
24. GenIterable
25. GenIterableLike
26. Traversable
27. Mutable
28. Traversable
29. GenTraversable
30. GenericTraversableTemplate
31. TraversableLike
32. GenTraversableLike
33. Parallelizable
34. TraversableOnce
35. GenTraversableOnce
36. FilterMonadic
37. HasNewBuilder
38. AnyRef
39. Any

Visibility

1. Public
2. All

### Instance Constructors

1. #### new Queue()

### Type Members

1. #### type Self = MutableList[A]

   The type implementing this traversable

   The type implementing this traversable

   Attributes
     protected
   Definition Classes
     TraversableLike

2. #### class WithFilter extends FilterMonadic[A, Repr]

   A class supporting filtered operations.

### Value Members

1. #### final def !=(arg0: AnyRef): Boolean

   Definition Classes
     AnyRef

2. #### final def !=(arg0: Any): Boolean

   Test two objects for inequality.

   Test two objects for inequality.

   returns

     `true` if !(this == that), false otherwise.

   Definition Classes
     Any

3. #### final def ##(): Int

   Equivalent to `x.hashCode` except for boxed numeric types.

   Equivalent to `x.hashCode` except for boxed numeric types. For numerics, it returns a hash value which is consistent with value equality: if two value type instances compare as true, then ## will produce the same hash value for each of them.

   returns

     a hash value consistent with ==

   Definition Classes
     AnyRef → Any

4. #### abstract def ++[B](that: GenTraversableOnce[B]): mutable.Queue[B]

   [use case] Returns a new mutable queue containing the elements from the left hand operand followed by the elements from the right hand operand.

   [use case]

   Returns a new mutable queue containing the elements from the left hand operand followed by the elements from the right hand operand. The element type of the mutable queue is the most specific superclass encompassing the element types of the two operands (see example).

   B

     the element type of the returned collection.

   that

     the traversable to append.

   returns

     a new collection of type `That` which contains all elements of this mutable queue followed by all elements of `that`.

   Definition Classes
     GenTraversableLike

5. #### def ++[B >: A, That](that: GenTraversableOnce[B])(implicit bf: CanBuildFrom[MutableList[A], B, That]): That

   Returns a new mutable queue containing the elements from the left hand operand followed by the elements from the right hand operand.

   Returns a new mutable queue containing the elements from the left hand operand followed by the elements from the right hand operand. The element type of the mutable queue is the most specific superclass encompassing the element types of the two operands (see example).

   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 class of the returned collection. Where possible, `That` is the same class as the current collection class `Repr`, but this depends on the element type `B` being admissible for that class, which means that an implicit instance of type `CanBuildFrom[Repr, B, That]` is found.

   that

     the traversable to append.

   bf

     an implicit value of class `CanBuildFrom` which determines the result class `That` from the current representation type `Repr` and the new element type `B`.

   returns

     a new collection of type `That` which contains all elements of this mutable queue followed by all elements of `that`.

   Definition Classes
     TraversableLike → GenTraversableLike

6. #### def ++:[B >: A, That](that: Traversable[B])(implicit bf: CanBuildFrom[MutableList[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.

   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 mutable queue which contains all elements of this mutable queue followed by all elements of `that`.

   Definition Classes
     TraversableLike

7. #### abstract def ++:[B](that: TraversableOnce[B]): mutable.Queue[B]

   [use case] Concatenates this mutable queue with the elements of a traversable collection.

   [use case]

   Concatenates this mutable queue with the elements of a traversable collection. It differs from ++ in that the right operand determines the type of the resulting collection rather than the left one.

   B

     the element type of the returned collection.

   that

     the traversable to append.

   returns

     a new collection of type `That` which contains all elements of this mutable queue followed by all elements of `that`.

   Definition Classes
     TraversableLike

8. #### def ++:[B >: A, That](that: TraversableOnce[B])(implicit bf: CanBuildFrom[MutableList[A], B, That]): That

   Concatenates this mutable queue with the elements of a traversable collection.

   Concatenates this mutable queue with the elements of a traversable collection. It differs from ++ in that the right operand determines the type of the resulting collection rather than the left one.

   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 class of the returned collection. Where possible, `That` is the same class as the current collection class `Repr`, but this depends on the element type `B` being admissible for that class, which means that an implicit instance of type `CanBuildFrom[Repr, B, That]` is found.

   that

     the traversable to append.

   bf

     an implicit value of class `CanBuildFrom` which determines the result class `That` from the current representation type `Repr` and the new element type `B`.

   returns

     a new collection of type `That` which contains all elements of this mutable queue followed by all elements of `that`.

   Definition Classes
     TraversableLike

9. #### def ++=(xs: TraversableOnce[A]): Queue.this.type

   adds all elements produced by a TraversableOnce to this mutable queue.

   adds all elements produced by a TraversableOnce to this mutable queue.

   returns

     the mutable queue itself.

   Definition Classes
     Growable

10. #### abstract def +:(elem: A): mutable.Queue[A]

    [use case] A copy of the mutable queue with an element prepended.

    [use case]

    A copy of the mutable queue with an element prepended.

    elem

      the prepended element

    returns

      a new collection of type `That` consisting of `elem` followed by all elements of this mutable queue.

    Definition Classes
      GenSeqLike

11. #### def +:[B >: A, That](elem: B)(implicit bf: CanBuildFrom[MutableList[A], B, That]): That

    A copy of the mutable queue with an element prepended.

    A copy of the mutable queue with an element prepended.

    Note that :-ending operators are right associative (see example). Also, the original mutable 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)

    B

      the element type of the returned mutable queue.

    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.

    elem

      the prepended 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

      a new collection of type `That` consisting of `elem` followed by all elements of this mutable queue.

    Definition Classes
      SeqLike → GenSeqLike

12. #### def +=(elem: A): Queue.this.type

    Appends a single element to this buffer.

    Appends a single element to this buffer. This takes constant time.

    elem

      the element to append.

    returns

      the builder itself.

    Definition Classes
      MutableList → Builder → Growable

13. #### def +=(elem1: A, elem2: A, elems: A*): Queue.this.type

    adds two or more elements to this mutable queue.

    adds two or more elements to this mutable queue.

    elem1

      the first element to add.

    elem2

      the second element to add.

    elems

      the remaining elements to add.

    returns

      the mutable queue itself

    Definition Classes
      Growable

14. #### def +=:(elem: A): Queue.this.type

    Prepends a single element to this list.

    Prepends a single element to this list. This operation takes constant time.

    elem

      the element to prepend.

    returns

      this mutable queue.

    Definition Classes
      MutableList

15. #### def /:[B](z: B)(op: (B, A) ⇒ B): B

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

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

                      op(...op(op(z, x1), x2), ..., xn)

      where `x1, ..., xn` are the elements of this mutable queue.

    Definition Classes
      TraversableOnce → GenTraversableOnce

16. #### def /:\[A1 >: A](z: A1)(op: (A1, A1) ⇒ A1): A1

    A syntactic sugar for out of order folding.

    A syntactic sugar for out of order folding. See `fold`.

    Example:

             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

    Definition Classes
      GenTraversableOnce

17. #### abstract def :+(elem: A): mutable.Queue[A]

    [use case] A copy of this mutable queue with an element appended.

    [use case]

    A copy of this mutable queue with an element appended.

    elem

      the appended element

    returns

      a new collection of type `That` consisting of all elements of this mutable queue followed by `elem`.

    Definition Classes
      GenSeqLike

18. #### def :+[B >: A, That](elem: B)(implicit bf: CanBuildFrom[MutableList[A], B, That]): That

    A copy of this mutable queue with an element appended.

    A copy of this mutable queue with an element appended.

    B

      the element type of the returned mutable queue.

    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.

    elem

      the appended 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

      a new collection of type `That` consisting of all elements of this mutable queue followed by `elem`.

    Definition Classes
      SeqLike → GenSeqLike

19. #### def :\[B](z: B)(op: (A, B) ⇒ B): B

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

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

                      op(x1, op(x2, ... op(xn, z)...))

      where `x1, ..., xn` are the elements of this mutable queue.

    Definition Classes
      TraversableOnce → GenTraversableOnce

20. #### final def ==(arg0: AnyRef): Boolean

    Definition Classes
      AnyRef

21. #### final def ==(arg0: Any): Boolean

    Test two objects for equality.

    Test two objects for equality.

    returns

      `true` if the receiver object is equivalent to the argument; `false` otherwise.

    Definition Classes
      Any

22. #### def addString(b: StringBuilder): StringBuilder

    Appends all elements of this mutable queue to a string builder.

    Appends all elements of this mutable queue to a string builder. The written text consists of the string representations (w.r.t. the method `toString`) of all elements of this mutable 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

23. #### def addString(b: StringBuilder, sep: String): StringBuilder

    Appends all elements of this mutable queue to a string builder using a separator string.

    Appends all elements of this mutable 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 mutable 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

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

    Appends all elements of this mutable queue to a string builder using start, end, and separator strings.

    Appends all elements of this mutable 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 mutable 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

25. #### 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)

    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

26. #### 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

27. #### def appendElem(elem: A): Unit

    Attributes
      protected
    Definition Classes
      MutableList

28. #### def apply(n: Int): A

    Returns the `n`th element of this list.

    Returns the `n`th element of this list.

    returns

      the element of this mutable queue at index `idx`, where `0` indicates the first element.

    Definition Classes
      MutableList → LinearSeqOptimized → SeqLike → GenSeqLike → Function1
    Exceptions thrown
      IndexOutOfBoundsException

      if index does not exist.

29. #### final def asInstanceOf[T0]: T0

    Cast the receiver object to be of type `T0`.

    Cast the receiver object to be of type `T0`.

    Note that the success of a cast at runtime is modulo Scala's erasure semantics. Therefore the expression `1.asInstanceOf[String]` will throw a `ClassCastException` at runtime, while the expression `List(1).asInstanceOf[List[String]]` will not. In the latter example, because the type argument is erased as part of compilation it is not possible to check whether the contents of the list are of the requested type.

    returns

      the receiver object.

    Definition Classes
      Any
    Exceptions thrown
      ClassCastException

      if the receiver object is not an instance of the erasure of type `T0`.

30. #### def canEqual(that: Any): Boolean

    Method called from equality methods, so that user-defined subclasses can refuse to be equal to other collections of the same kind.

    Method called from equality methods, so that user-defined subclasses can refuse to be equal to other collections of the same kind.

    that

      The object with which this mutable queue should be compared

    returns

      `true`, if this mutable 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

31. #### def clear(): Unit

    Clears the contents of this builder.

    Clears the contents of this builder. After execution of this method the builder will contain no elements.

    Definition Classes
      MutableList → Builder → Growable

32. #### def clone(): Queue[A]

    Create a copy of the receiver object.

    Create a copy of the receiver object.

    The default implementation of the `clone` method is platform dependent.

    returns

      a copy of the receiver object.

    Definition Classes
      Cloneable → AnyRef
    Note

      not specified by SLS as a member of AnyRef

33. #### abstract def collect[B](pf: PartialFunction[A, B]): mutable.Queue[B]

    [use case] Builds a new collection by applying a partial function to all elements of this mutable queue on which the function is defined.

    [use case]

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

    B

      the element type of the returned collection.

    pf

      the partial function which filters and maps the mutable queue.

    returns

      a new collection of type `That` resulting from applying the partial function `pf` to each element on which it is defined and collecting the results. The order of the elements is preserved.

    Definition Classes
      GenTraversableLike

34. #### def collect[B, That](pf: PartialFunction[A, B])(implicit bf: CanBuildFrom[MutableList[A], B, That]): That

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

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

    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.

    pf

      the partial function which filters and maps the mutable queue.

    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` resulting from applying the 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

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

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

    Finds the first element of the mutable 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)`

36. #### def combinations(n: Int): Iterator[MutableList[A]]

    Iterates over combinations.

    Iterates over combinations.

    returns

      An Iterator which traverses the possible n-element combinations of this mutable queue.

    Definition Classes
      SeqLike
    Example:

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

37. #### def companion: GenericCompanion[Queue]

    The factory companion object that builds instances of class mutable.

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

    Definition Classes
      Queue → MutableList → LinearSeq → LinearSeq → Seq → Seq → GenSeq → Iterable → Iterable → GenIterable → Traversable → Traversable → GenTraversable → GenericTraversableTemplate

38. #### 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

39. #### def contains(elem: Any): Boolean

    Tests whether this mutable queue contains a given value as an element.

    Tests whether this mutable queue contains a given value as an element.

    elem

      the element to test.

    returns

      `true` if this mutable queue has an element that is is equal (wrt `==`) to `elem`, `false` otherwise.

    Definition Classes
      SeqLike

40. #### def containsSlice[B](that: GenSeq[B]): Boolean

    Tests whether this mutable queue contains a given sequence as a slice.

    Tests whether this mutable queue contains a given sequence as a slice.

    that

      the sequence to test

    returns

      `true` if this mutable queue contains a slice with the same elements as `that`, otherwise `false`.

    Definition Classes
      SeqLike

41. #### abstract def copyToArray(xs: Array[A], start: Int, len: Int): Unit

    [use case] Copies elements of this mutable queue to an array.

    [use case]

    Copies elements of this mutable queue to an array. Fills the given array `xs` with at most `len` elements of this mutable queue, starting at position `start`. Copying will stop once either the end of the current mutable 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
      TraversableLike

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

    Copies elements of this mutable queue to an array.

    Copies elements of this mutable queue to an array. Fills the given array `xs` with at most `len` elements of this mutable queue, starting at position `start`. Copying will stop once either the end of the current mutable queue is reached, or the end of the array is reached, or `len` elements have been copied.

    B

      the type of the elements of the array.

    xs

      the array to fill.

    start

      the starting index.

    len

      the maximal number of elements to copy.

    Definition Classes
      IterableLike → TraversableLike → TraversableOnce → GenTraversableOnce

43. #### abstract def copyToArray(xs: Array[A]): Unit

    [use case] Copies values of this mutable queue to an array.

    [use case]

    Copies values of this mutable queue to an array. Fills the given array `xs` with values of this mutable queue. Copying will stop once either the end of the current mutable queue is reached, or the end of the array is reached.

    xs

      the array to fill.

    Definition Classes
      GenTraversableOnce

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

    Copies values of this mutable queue to an array.

    Copies values of this mutable queue to an array. Fills the given array `xs` with values of this mutable queue. Copying will stop once either the end of the current mutable queue is reached, or the end of the array is reached.

    B

      the type of the elements of the array.

    xs

      the array to fill.

    Definition Classes
      TraversableOnce → GenTraversableOnce

45. #### abstract def copyToArray(xs: Array[A], start: Int): Unit

    [use case] Copies values of this mutable queue to an array.

    [use case]

    Copies values of this mutable queue to an array. Fills the given array `xs` with values of this mutable queue, beginning at index `start`. Copying will stop once either the end of the current mutable queue is reached, or the end of the array is reached.

    xs

      the array to fill.

    start

      the starting index.

    Definition Classes
      GenTraversableOnce

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

    Copies values of this mutable queue to an array.

    Copies values of this mutable queue to an array. Fills the given array `xs` with values of this mutable queue, beginning at index `start`. Copying will stop once either the end of the current mutable queue is reached, or the end of the array is reached.

    B

      the type of the elements of the array.

    xs

      the array to fill.

    start

      the starting index.

    Definition Classes
      TraversableOnce → GenTraversableOnce

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

    Copies all elements of this mutable queue to a buffer.

    Copies all elements of this mutable queue to a buffer.

    dest

      The buffer to which elements are copied.

    Definition Classes
      TraversableOnce

48. #### def corresponds[B](that: GenSeq[B])(p: (A, B) ⇒ Boolean): Boolean

    Tests whether every element of this mutable queue relates to the corresponding element of another sequence by satisfying a test predicate.

    Tests whether every element of this mutable 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 mutable queue and `y` of `that`, otherwise `false`.

    Definition Classes
      SeqLike → GenSeqLike

49. #### def count(p: (A) ⇒ Boolean): Int

    Counts the number of elements in the mutable queue which satisfy a predicate.

    Counts the number of elements in the mutable queue which satisfy a predicate.

    p

      the predicate used to test elements.

    returns

      the number of elements satisfying the predicate `p`.

    Definition Classes
      LinearSeqOptimized → TraversableOnce → GenTraversableOnce

50. #### def dequeue(): A

    Returns the first element in the queue, and removes this element from the queue.

    Returns the first element in the queue, and removes this element from the queue.

    returns

      the first element of the queue.

    Exceptions thrown
      Predef.NoSuchElementException

51. #### def dequeueAll(p: (A) ⇒ Boolean): Seq[A]

    Returns all elements in the queue which satisfy the given predicate, and removes those elements from the queue.

    Returns all elements in the queue which satisfy the given predicate, and removes those elements from the queue.

    p

      the predicate used for choosing elements

    returns

      a sequence of all elements in the queue for which p yields true.

52. #### def dequeueFirst(p: (A) ⇒ Boolean): Option[A]

    Returns the first element in the queue which satisfies the given predicate, and removes this element from the queue.

    Returns the first element in the queue which satisfies the given predicate, and removes this element from the queue.

    p

      the predicate used for choosing the first element

    returns

      the first element of the queue for which p yields true

53. #### abstract def diff(that: Seq[A]): mutable.Queue[A]

    [use case] Computes the multiset difference between this mutable queue and another sequence.

    [use case]

    Computes the multiset difference between this mutable queue and another sequence.

    that

      the sequence of elements to remove

    returns

      a new collection of type `That` which contains all elements of this mutable 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

54. #### def diff[B >: A](that: GenSeq[B]): MutableList[A]

    Computes the multiset difference between this mutable queue and another sequence.

    Computes the multiset difference between this mutable queue and another sequence.

    B

      the element type of the returned mutable queue.

    that

      the sequence of elements to remove

    returns

      a new collection of type `That` which contains all elements of this mutable 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

55. #### def distinct: MutableList[A]

    Builds a new mutable queue from this mutable queue without any duplicate elements.

    Builds a new mutable queue from this mutable queue without any duplicate elements.

    returns

      A new mutable queue which contains the first occurrence of every element of this mutable queue.

    Definition Classes
      SeqLike → GenSeqLike

56. #### def drop(n: Int): MutableList[A]

    Selects all elements except first n ones.

    Selects all elements except first n ones.

    n

      the number of elements to drop from this mutable queue.

    returns

      a mutable queue consisting of all elements of this mutable queue except the first `n` ones, or else the empty mutable queue, if this mutable queue has less than `n` elements.

    Definition Classes
      LinearSeqOptimized → IterableLike → TraversableLike → GenTraversableLike

57. #### def dropRight(n: Int): MutableList[A]

    Selects all elements except last n ones.

    Selects all elements except last n ones.

    n

      The number of elements to take

    returns

      a mutable queue consisting of all elements of this mutable queue except the last `n` ones, or else the empty mutable queue, if this mutable queue has less than `n` elements.

    Definition Classes
      LinearSeqOptimized → IterableLike

58. #### def dropWhile(p: (A) ⇒ Boolean): MutableList[A]

    Drops longest prefix of elements that satisfy a predicate.

    Drops longest prefix of elements that satisfy a predicate.

    p

      The predicate used to test elements.

    returns

      the longest suffix of this mutable queue whose first element does not satisfy the predicate `p`.

    Definition Classes
      TraversableLike → GenTraversableLike

59. #### def endsWith[B](that: GenSeq[B]): Boolean

    Tests whether this mutable queue ends with the given sequence.

    Tests whether this mutable queue ends with the given sequence.

    that

      the sequence to test

    returns

      `true` if this mutable queue has `that` as a suffix, `false` otherwise.

    Definition Classes
      SeqLike → GenSeqLike

60. #### def enqueue(elems: A*): Unit

    Adds all elements to the queue.

    Adds all elements to the queue.

    elems

      the elements to add.

61. #### final def eq(arg0: AnyRef): Boolean

    Tests whether the argument (`arg0`) is a reference to the receiver object (`this`).

    Tests whether the argument (`arg0`) is a reference to the receiver object (`this`).

    The `eq` method implements an equivalence relation on non-null instances of `AnyRef`, and has three additional properties:

    - It is consistent: for any non-null instances `x` and `y` of type `AnyRef`, multiple invocations of `x.eq(y)` consistently returns `true` or consistently returns `false`.
    - For any non-null instance `x` of type `AnyRef`, `x.eq(null)` and `null.eq(x)` returns `false`.
    - `null.eq(null)` returns `true`.

    When overriding the `equals` or `hashCode` methods, it is important to ensure that their behavior is consistent with reference equality. Therefore, if two objects are references to each other (`o1 eq o2`), they should be equal to each other (`o1 == o2`) and they should hash to the same value (`o1.hashCode == o2.hashCode`).

    returns

      `true` if the argument is a reference to the receiver object; `false` otherwise.

    Definition Classes
      AnyRef

62. #### 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 → AnyRef → Any

63. #### def exists(p: (A) ⇒ Boolean): Boolean

    Tests whether a predicate holds for some of the elements of this mutable queue.

    Tests whether a predicate holds for some of the elements of this mutable queue.

    p

      the predicate used to test elements.

    returns

      `true` if the given predicate `p` holds for some of the elements of this mutable queue, otherwise `false`.

    Definition Classes
      LinearSeqOptimized → IterableLike → TraversableLike → TraversableOnce → GenTraversableOnce

64. #### def extractFirst(start: LinkedList[A], p: (A) ⇒ Boolean): Option[LinkedList[A]]

    Return the proper suffix of this list which starts with the first element that satisfies `p`.

    Return the proper suffix of this list which starts with the first element that satisfies `p`. That element is unlinked from the list. If no element satisfies `p`, return None.

65. #### def filter(p: (A) ⇒ Boolean): MutableList[A]

    Selects all elements of this mutable queue which satisfy a predicate.

    Selects all elements of this mutable queue which satisfy a predicate.

    p

      the predicate used to test elements.

    returns

      a new mutable queue consisting of all elements of this mutable queue that satisfy the given predicate `p`. The order of the elements is preserved.

    Definition Classes
      TraversableLike → GenTraversableLike

66. #### def filterNot(p: (A) ⇒ Boolean): MutableList[A]

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

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

    p

      the predicate used to test elements.

    returns

      a new mutable queue consisting of all elements of this mutable queue that do not satisfy the given predicate `p`. The order of the elements is preserved.

    Definition Classes
      TraversableLike → GenTraversableLike

67. #### def finalize(): Unit

    Called by the garbage collector on the receiver object when there are no more references to the object.

    Called by the garbage collector on the receiver object when there are no more references to the object.

    The details of when and if the `finalize` method is invoked, as well as the interaction between `finalize` and non-local returns and exceptions, are all platform dependent.

    Attributes
      protected[lang]
    Definition Classes
      AnyRef
    Annotations
      @throws()
    Note

      not specified by SLS as a member of AnyRef

68. #### def find(p: (A) ⇒ Boolean): Option[A]

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

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

    p

      the predicate used to test elements.

    returns

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

    Definition Classes
      LinearSeqOptimized → IterableLike → TraversableLike → TraversableOnce → GenTraversableOnce

69. #### var first0: LinkedList[A]

    Attributes
      protected
    Definition Classes
      MutableList

70. #### abstract def flatMap[B](f: (A) ⇒ GenTraversableOnce[B]): mutable.Queue[B]

    [use case] Builds a new collection by applying a function to all elements of this mutable queue and using the elements of the resulting collections.

    [use case]

    Builds a new collection by applying a function to all elements of this mutable queue and using the elements of the resulting collections. For example:

    B

      the element type of the returned collection.

    f

      the function to apply to each element.

    returns

      a new collection of type `That` resulting from applying the given collection-valued function `f` to each element of this mutable queue and concatenating the results.

    Definition Classes
      GenTraversableLike

71. #### def flatMap[B, That](f: (A) ⇒ GenTraversableOnce[B])(implicit bf: CanBuildFrom[MutableList[A], B, That]): That

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

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

    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.

    f

      the function to apply to each 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

      a new collection of type `That` resulting from applying the given collection-valued function `f` to each element of this mutable queue and concatenating the results.

    Definition Classes
      TraversableLike → GenTraversableLike → FilterMonadic

72. #### abstract def flatten[B]: mutable.Queue[B]

    [use case] Converts this mutable queue of traversable collections into a mutable queue formed by the elements of these traversable collections.

    [use case]

    Converts this mutable queue of traversable collections into a mutable queue formed by the elements of these traversable collections.

    B

      the type of the elements of each traversable collection.

    returns

      a new mutable queue resulting from concatenating all element mutable queues.

    Definition Classes
      GenericTraversableTemplate

73. #### def fold[A1 >: A](z: A1)(op: (A1, A1) ⇒ A1): A1

    Folds the elements of this mutable queue using the specified associative binary operator.

    Folds the elements of this mutable 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

74. #### def foldLeft[B](z: B)(f: (B, A) ⇒ B): B

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

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

    B

      the result type of the binary operator.

    z

      the start value.

    returns

      the result of inserting `op` between consecutive elements of this mutable queue, going left to right with the start value `z` on the left:

                      op(...op(z, x1), x2, ..., xn)

      where `x1, ..., xn` are the elements of this mutable queue.

    Definition Classes
      LinearSeqOptimized → TraversableOnce → GenTraversableOnce

75. #### def foldRight[B](z: B)(f: (A, B) ⇒ B): B

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

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

    B

      the result type of the binary operator.

    z

      the start value.

    returns

      the result of inserting `op` between consecutive elements of this mutable queue, going right to left with the start value `z` on the right:

                      op(x1, op(x2, ... op(xn, z)...))

      where `x1, ..., xn` are the elements of this mutable queue.

    Definition Classes
      LinearSeqOptimized → IterableLike → TraversableOnce → GenTraversableOnce

76. #### def forall(p: (A) ⇒ Boolean): Boolean

    Tests whether a predicate holds for all elements of this mutable queue.

    Tests whether a predicate holds for all elements of this mutable queue.

    p

      the predicate used to test elements.

    returns

      `true` if the given predicate `p` holds for all elements of this mutable queue, otherwise `false`.

    Definition Classes
      LinearSeqOptimized → IterableLike → TraversableLike → TraversableOnce → GenTraversableOnce

77. #### abstract def foreach(f: (A) ⇒ Unit): Unit

    [use case] Applies a function `f` to all elements of this mutable queue.

    [use case]

    Applies a function `f` to all elements of this mutable queue.

    f

      the function that is applied for its side-effect to every element. The result of function `f` is discarded.

    Definition Classes
      IterableLike

78. #### def foreach[B](f: (A) ⇒ B): Unit

    Applies a function `f` to all elements of this mutable queue.

    Applies a function `f` to all elements of this mutable 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
      LinearSeqOptimized → IterableLike → TraversableLike → GenTraversableLike → TraversableOnce → GenTraversableOnce → FilterMonadic

79. #### 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.

80. #### def genericBuilder[B]: Builder[B, Queue[B]]

    The generic builder that builds instances of mutable.

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

    Definition Classes
      GenericTraversableTemplate

81. #### def get(n: Int): Option[A]

    Returns the `n`th element of this list or `None` if index does not exist.

    Returns the `n`th element of this list or `None` if index does not exist.

    Definition Classes
      MutableList

82. #### final def getClass(): java.lang.Class[_]

    A representation that corresponds to the dynamic class of the receiver object.

    A representation that corresponds to the dynamic class of the receiver object.

    The nature of the representation is platform dependent.

    returns

      a representation that corresponds to the dynamic class of the receiver object.

    Definition Classes
      AnyRef → Any
    Note

      not specified by SLS as a member of AnyRef

83. #### def groupBy[K](f: (A) ⇒ K): Map[K, MutableList[A]]

    Partitions this mutable queue into a map of mutable queues according to some discriminator function.

    Partitions this mutable queue into a map of mutable 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 mutable queue.

    K

      the type of keys returned by the discriminator function.

    f

      the discriminator function.

    returns

      A map from keys to mutable 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 mutable queue of those elements `x` for which `f(x)` equals `k`.

    Definition Classes
      TraversableLike → GenTraversableLike

84. #### def grouped(size: Int): Iterator[MutableList[A]]

    Partitions elements in fixed size mutable queues.

    Partitions elements in fixed size mutable queues.

    size

      the number of elements per group

    returns

      An iterator producing mutable queues of size `size`, except the last will be truncated if the elements don't divide evenly.

    Definition Classes
      IterableLike
    See also

      Iterator#grouped

85. #### def hasDefiniteSize: Boolean

    Tests whether this mutable queue is known to have a finite size.

    Tests whether this mutable 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

86. #### def hashCode(): Int

    Hashcodes for mutable.

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

    returns

      the hash code value for this object.

    Definition Classes
      GenSeqLike → AnyRef → Any

87. #### def head: A

    Returns the first element in this list

    Returns the first element in this list

    returns

      the first element of this mutable queue.

    Definition Classes
      MutableList → LinearSeqOptimized → IterableLike → GenIterableLike → GenericTraversableTemplate → TraversableLike → GenTraversableLike

88. #### def headOption: Option[A]

    Optionally selects the first element.

    Optionally selects the first element.

    returns

      the first element of this mutable queue if it is nonempty, `None` if it is empty.

    Definition Classes
      TraversableLike

89. #### abstract def indexOf(elem: A, from: Int): Int

    [use case] Finds index of first occurrence of some value in this mutable queue after or at some start index.

    [use case]

    Finds index of first occurrence of some value in this mutable 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 mutable queue that is equal (wrt `==`) to `elem`, or `-1`, if none exists.

    Definition Classes
      GenSeqLike

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

    Finds index of first occurrence of some value in this mutable queue after or at some start index.

    Finds index of first occurrence of some value in this mutable queue after or at some start index.

    B

      the type of the element `elem`.

    elem

      the element value to search for.

    from

      the start index

    returns

      the index `>= from` of the first element of this mutable queue that is equal (wrt `==`) to `elem`, or `-1`, if none exists.

    Definition Classes
      GenSeqLike

91. #### abstract def indexOf(elem: A): Int

    [use case] Finds index of first occurrence of some value in this mutable queue.

    [use case]

    Finds index of first occurrence of some value in this mutable queue.

    elem

      the element value to search for.

    returns

      the index of the first element of this mutable queue that is equal (wrt `==`) to `elem`, or `-1`, if none exists.

    Definition Classes
      GenSeqLike

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

    Finds index of first occurrence of some value in this mutable queue.

    Finds index of first occurrence of some value in this mutable queue.

    B

      the type of the element `elem`.

    elem

      the element value to search for.

    returns

      the index of the first element of this mutable queue that is equal (wrt `==`) to `elem`, or `-1`, if none exists.

    Definition Classes
      GenSeqLike

93. #### def indexOfSlice[B >: A](that: GenSeq[B], from: Int): Int

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

    Finds first index after or at a start index where this mutable 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 mutable queue starting at this index match the elements of sequence `that`, or `-1` of no such subsequence exists.

    Definition Classes
      SeqLike

94. #### def indexOfSlice[B >: A](that: GenSeq[B]): Int

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

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

    that

      the sequence to test

    returns

      the first index such that the elements of this mutable queue starting at this index match the elements of sequence `that`, or `-1` of no such subsequence exists.

    Definition Classes
      SeqLike

95. #### 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 mutable queue that satisfies the predicate `p`, or `-1`, if none exists.

    Definition Classes
      LinearSeqOptimized → SeqLike → GenSeqLike

96. #### 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 mutable queue that satisfies the predicate `p`, or `-1`, if none exists.

    Definition Classes
      GenSeqLike

97. #### 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 mutable queue.

    Definition Classes
      SeqLike

98. #### def init: MutableList[A]

    Selects all elements except the last.

    Selects all elements except the last.

    returns

      a mutable queue consisting of all elements of this mutable queue except the last one.

    Definition Classes
      TraversableLike
    Exceptions thrown
      `UnsupportedOperationException`

      if the mutable queue is empty.

99. #### def inits: Iterator[MutableList[A]]

    Iterates over the inits of this mutable queue.

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

    returns

      an iterator over all the inits of this mutable queue

    Definition Classes
      TraversableLike
    Example:

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

100. #### abstract def intersect(that: Seq[A]): mutable.Queue[A]

     [use case] Computes the multiset intersection between this mutable queue and another sequence.

     [use case]

     Computes the multiset intersection between this mutable queue and another sequence.

     that

       the sequence of elements to intersect with.

     returns

       a new collection of type `That` which contains all elements of this mutable 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

101. #### def intersect[B >: A](that: GenSeq[B]): MutableList[A]

     Computes the multiset intersection between this mutable queue and another sequence.

     Computes the multiset intersection between this mutable queue and another sequence.

     B

       the element type of the returned mutable queue.

     that

       the sequence of elements to intersect with.

     returns

       a new collection of type `That` which contains all elements of this mutable 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

102. #### def isDefinedAt(x: Int): Boolean

     Tests whether this mutable queue contains given index.

     Tests whether this mutable queue contains given index.

     The implementations of methods `apply` and `isDefinedAt` turn a `Seq[A]` into a `PartialFunction[Int, A]`.

     returns

       `true` if this mutable queue contains an element at position `idx`, `false` otherwise.

     Definition Classes
       LinearSeqOptimized → GenSeqLike

103. #### def isEmpty: Boolean

     Is the list empty?

     Is the list empty?

     returns

       `true` if the mutable queue contains no elements, `false` otherwise.

     Definition Classes
       MutableList → LinearSeqOptimized → IterableLike → GenIterableLike → GenericTraversableTemplate → TraversableLike → TraversableOnce → GenTraversableOnce

104. #### final def isInstanceOf[T0]: Boolean

     Test whether the dynamic type of the receiver object is `T0`.

     Test whether the dynamic type of the receiver object is `T0`.

     Note that the result of the test is modulo Scala's erasure semantics. Therefore the expression `1.isInstanceOf[String]` will return `false`, while the expression `List(1).isInstanceOf[List[String]]` will return `true`. In the latter example, because the type argument is erased as part of compilation it is not possible to check whether the contents of the list are of the specified type.

     returns

       `true` if the receiver object is an instance of erasure of type `T0`; `false` otherwise.

     Definition Classes
       Any

105. #### final def isTraversableAgain: Boolean

     Tests whether this mutable queue can be repeatedly traversed.

     Tests whether this mutable queue can be repeatedly traversed.

     returns

       `true`

     Definition Classes
       GenTraversableLike → GenTraversableOnce

106. #### def iterator: Iterator[A]

     Returns an iterator over all elements of this list.

     Returns an iterator over all elements of this list.

     returns

       the new iterator

     Definition Classes
       MutableList → LinearSeqLike → IterableLike → GenIterableLike

107. #### def last: A

     Selects the last element.

     Selects the last element.

     returns

       The last element of this mutable queue.

     Definition Classes
       MutableList → LinearSeqOptimized → TraversableLike
     Exceptions thrown
       NoSuchElementException

       If the mutable queue is empty.

108. #### var last0: LinkedList[A]

     Attributes
       protected
     Definition Classes
       MutableList

109. #### abstract def lastIndexOf(elem: A, end: Int): Int

     [use case] Finds index of last occurrence of some value in this mutable queue before or at a given end index.

     [use case]

     Finds index of last occurrence of some value in this mutable 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 mutable queue that is equal (wrt `==`) to `elem`, or `-1`, if none exists.

     Definition Classes
       GenSeqLike

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

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

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

     B

       the type of the element `elem`.

     elem

       the element value to search for.

     end

       the end index.

     returns

       the index `<= end` of the last element of this mutable queue that is equal (wrt `==`) to `elem`, or `-1`, if none exists.

     Definition Classes
       GenSeqLike

111. #### abstract def lastIndexOf(elem: A): Int

     [use case] Finds index of last occurrence of some value in this mutable queue.

     [use case]

     Finds index of last occurrence of some value in this mutable queue.

     elem

       the element value to search for.

     returns

       the index of the last element of this mutable queue that is equal (wrt `==`) to `elem`, or `-1`, if none exists.

     Definition Classes
       GenSeqLike

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

     Finds index of last occurrence of some value in this mutable queue.

     Finds index of last occurrence of some value in this mutable queue.

     B

       the type of the element `elem`.

     elem

       the element value to search for.

     returns

       the index of the last element of this mutable queue that is equal (wrt `==`) to `elem`, or `-1`, if none exists.

     Definition Classes
       GenSeqLike

113. #### def lastIndexOfSlice[B >: A](that: GenSeq[B], end: Int): Int

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

     Finds last index before or at a given end index where this mutable 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 mutable queue starting at this index match the elements of sequence `that`, or `-1` of no such subsequence exists.

     Definition Classes
       SeqLike

114. #### def lastIndexOfSlice[B >: A](that: GenSeq[B]): Int

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

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

     that

       the sequence to test

     returns

       the last index such that the elements of this mutable queue starting a this index match the elements of sequence `that`, or `-1` of no such subsequence exists.

     Definition Classes
       SeqLike

115. #### 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 mutable queue that satisfies the predicate `p`, or `-1`, if none exists.

     Definition Classes
       LinearSeqOptimized → SeqLike → GenSeqLike

116. #### 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 mutable queue that satisfies the predicate `p`, or `-1`, if none exists.

     Definition Classes
       GenSeqLike

117. #### def lastOption: Option[A]

     Optionally selects the last element.

     Optionally selects the last element.

     returns

       the last element of this mutable queue$ if it is nonempty, `None` if it is empty.

     Definition Classes
       TraversableLike

118. #### var len: Int

     Attributes
       protected
     Definition Classes
       MutableList

119. #### def length: Int

     Returns the length of this list.

     Returns the length of this list.

     returns

       the number of elements in this mutable queue.

     Definition Classes
       MutableList → LinearSeqOptimized → SeqLike → GenSeqLike

120. #### def lengthCompare(len: Int): Int

     Compares the length of this mutable queue to a test value.

     Compares the length of this mutable 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
       LinearSeqOptimized → SeqLike

121. #### 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

122. #### abstract def map[B](f: (A) ⇒ B): mutable.Queue[B]

     [use case] Builds a new collection by applying a function to all elements of this mutable queue.

     [use case]

     Builds a new collection by applying a function to all elements of this mutable queue.

     B

       the element type of the returned collection.

     f

       the function to apply to each element.

     returns

       a new collection of type `That` resulting from applying the given function `f` to each element of this mutable queue and collecting the results.

     Definition Classes
       GenTraversableLike

123. #### def map[B, That](f: (A) ⇒ B)(implicit bf: CanBuildFrom[MutableList[A], B, That]): That

     Builds a new collection by applying a function to all elements of this mutable queue.

     Builds a new collection by applying a function to all elements of this mutable queue.

     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.

     f

       the function to apply to each 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

       a new collection of type `That` resulting from applying the given function `f` to each element of this mutable queue and collecting the results.

     Definition Classes
       TraversableLike → GenTraversableLike → FilterMonadic

124. #### def mapResult[NewTo](f: (MutableList[A]) ⇒ NewTo): Builder[A, NewTo]

     Creates a new builder by applying a transformation function to the results of this builder.

     Creates a new builder by applying a transformation function to the results of this builder.

     NewTo

       the type of collection returned by `f`.

     f

       the transformation function.

     returns

       a new builder which is the same as the current builder except that a transformation function is applied to this builder's result.

     Definition Classes
       Builder

125. #### abstract def max: A

     [use case] Finds the largest element.

     [use case]

     Finds the largest element.

     returns

       the largest element of this mutable queue with respect to the ordering `cmp`.

     Definition Classes
       GenTraversableOnce

126. #### def max[B >: A](implicit cmp: Ordering[B]): A

     Finds the largest element.

     Finds the largest element.

     B

       The type over which the ordering is defined.

     cmp

       An ordering to be used for comparing elements.

     returns

       the largest element of this mutable queue with respect to the ordering `cmp`.

     Definition Classes
       TraversableOnce → GenTraversableOnce

127. #### def maxBy[B](f: (A) ⇒ B)(implicit cmp: Ordering[B]): A

     Definition Classes
       TraversableOnce → GenTraversableOnce

128. #### abstract def min: A

     [use case] Finds the smallest element.

     [use case]

     Finds the smallest element.

     returns

       the smallest element of this mutable queue with respect to the ordering `cmp`.

     Definition Classes
       GenTraversableOnce

129. #### def min[B >: A](implicit cmp: Ordering[B]): A

     Finds the smallest element.

     Finds the smallest element.

     B

       The type over which the ordering is defined.

     cmp

       An ordering to be used for comparing elements.

     returns

       the smallest element of this mutable queue with respect to the ordering `cmp`.

     Definition Classes
       TraversableOnce → GenTraversableOnce

130. #### def minBy[B](f: (A) ⇒ B)(implicit cmp: Ordering[B]): A

     Definition Classes
       TraversableOnce → GenTraversableOnce

131. #### def mkString: String

     Displays all elements of this mutable queue in a string.

     Displays all elements of this mutable queue in a string.

     returns

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

     Definition Classes
       TraversableOnce → GenTraversableOnce

132. #### def mkString(sep: String): String

     Displays all elements of this mutable queue in a string using a separator string.

     Displays all elements of this mutable queue in a string using a separator string.

     sep

       the separator string.

     returns

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

     Definition Classes
       TraversableOnce → GenTraversableOnce
     Example:

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

133. #### def mkString(start: String, sep: String, end: String): String

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

     Displays all elements of this mutable 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 mutable 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 mutable queue are separated by the string `sep`.

     Definition Classes
       TraversableOnce → GenTraversableOnce
     Example:

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

134. #### final def ne(arg0: AnyRef): Boolean

     Equivalent to `!(this eq that)`.

     Equivalent to `!(this eq that)`.

     returns

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

     Definition Classes
       AnyRef

135. #### def newBuilder: Builder[A, Queue[A]]

     The builder that builds instances of type mutable.

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

     Attributes
       protected[this]
     Definition Classes
       Queue → MutableList → GenericTraversableTemplate → TraversableLike → HasNewBuilder

136. #### def nonEmpty: Boolean

     Tests whether the mutable queue is not empty.

     Tests whether the mutable queue is not empty.

     returns

       `true` if the mutable queue contains at least one element, `false` otherwise.

     Definition Classes
       TraversableOnce → GenTraversableOnce

137. #### final def notify(): Unit

     Wakes up a single thread that is waiting on the receiver object's monitor.

     Wakes up a single thread that is waiting on the receiver object's monitor.

     Definition Classes
       AnyRef
     Note

       not specified by SLS as a member of AnyRef

138. #### final def notifyAll(): Unit

     Wakes up all threads that are waiting on the receiver object's monitor.

     Wakes up all threads that are waiting on the receiver object's monitor.

     Definition Classes
       AnyRef
     Note

       not specified by SLS as a member of AnyRef

139. #### 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

140. #### abstract def padTo(len: Int, elem: A): mutable.Queue[A]

     [use case] A copy of this mutable queue with an element value appended until a given target length is reached.

     [use case]

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

     len

       the target length

     elem

       the padding value

     returns

       a new collection of type `That` consisting of all elements of this mutable queue followed by the minimal number of occurrences of `elem` so that the resulting collection has a length of at least `len`.

     Definition Classes
       GenSeqLike

141. #### def padTo[B >: A, That](len: Int, elem: B)(implicit bf: CanBuildFrom[MutableList[A], B, That]): That

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

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

     B

       the element type of the returned mutable queue.

     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.

     len

       the target length

     elem

       the padding value

     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` consisting of all elements of this mutable queue followed by the minimal number of occurrences of `elem` so that the resulting collection has a length of at least `len`.

     Definition Classes
       SeqLike → GenSeqLike

142. #### 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

143. #### 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
       SeqLike → SeqLike → TraversableLike → Parallelizable

144. #### def partition(p: (A) ⇒ Boolean): (MutableList[A], MutableList[A])

     Partitions this mutable queue in two mutable queues according to a predicate.

     Partitions this mutable queue in two mutable queues according to a predicate.

     p

       the predicate on which to partition.

     returns

       a pair of mutable queues: the first mutable queue consists of all elements that satisfy the predicate `p` and the second mutable queue consists of all elements that don't. The relative order of the elements in the resulting mutable queues is the same as in the original mutable queue.

     Definition Classes
       TraversableLike → GenTraversableLike

145. #### abstract def patch(from: Int, that: GenSeq[A], replaced: Int): mutable.Queue[A]

     [use case] Produces a new mutable queue where a slice of elements in this mutable queue is replaced by another sequence.

     [use case]

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

     from

       the index of the first replaced element

     replaced

       the number of elements to drop in the original mutable queue

     returns

       a new mutable queue consisting of all elements of this mutable queue except that `replaced` elements starting from `from` are replaced by `patch`.

     Definition Classes
       GenSeqLike

146. #### def patch[B >: A, That](from: Int, patch: GenSeq[B], replaced: Int)(implicit bf: CanBuildFrom[MutableList[A], B, That]): That

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

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

     B

       the element type of the returned mutable queue.

     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.

     from

       the index of the first replaced element

     patch

       the replacement sequence

     replaced

       the number of elements to drop in the original mutable queue

     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 mutable queue consisting of all elements of this mutable queue except that `replaced` elements starting from `from` are replaced by `patch`.

     Definition Classes
       SeqLike → GenSeqLike

147. #### def permutations: Iterator[MutableList[A]]

     Iterates over distinct permutations.

     Iterates over distinct permutations.

     returns

       An Iterator which traverses the distinct permutations of this mutable queue.

     Definition Classes
       SeqLike
     Example:

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

148. #### 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 mutable queue such that every element of the segment satisfies the predicate `p`.

     Definition Classes
       GenSeqLike

149. #### def prependElem(elem: A): Unit

     Attributes
       protected
     Definition Classes
       MutableList

150. #### abstract 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 of this mutable queue with respect to the `*` operator in `num`.

     Definition Classes
       GenTraversableOnce

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

     Multiplies up the elements of this collection.

     Multiplies up the elements of this collection.

     B

       the result type of the `*` operator.

     num

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

     returns

       the product of all elements of this mutable queue with respect to the `*` operator in `num`.

     Definition Classes
       TraversableOnce → GenTraversableOnce

152. #### def reduce[A1 >: A](op: (A1, A1) ⇒ A1): A1

     Reduces the elements of this mutable queue using the specified associative binary operator.

     Reduces the elements of this mutable 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 mutable queue is nonempty.

     Definition Classes
       TraversableOnce → GenTraversableOnce
     Exceptions thrown
       UnsupportedOperationException

       if this mutable queue is empty.

153. #### def reduceLeft[B >: A](f: (B, A) ⇒ B): B

     Definition Classes
       LinearSeqOptimized → TraversableOnce

154. #### def reduceLeftOption[B >: A](op: (B, A) ⇒ B): Option[B]

     Optionally applies a binary operator to all elements of this mutable queue, going left to right.

     Optionally applies a binary operator to all elements of this mutable 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 mutable queue is nonempty, `None` otherwise.

     Definition Classes
       TraversableOnce → GenTraversableOnce

155. #### def reduceOption[A1 >: A](op: (A1, A1) ⇒ A1): Option[A1]

     Reduces the elements of this mutable queue, if any, using the specified associative binary operator.

     Reduces the elements of this mutable 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

156. #### def reduceRight[B >: A](op: (A, B) ⇒ B): B

     Applies a binary operator to all elements of this mutable queue, going right to left.

     Applies a binary operator to all elements of this mutable 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 mutable queue, going right to left:

                       op(x,,1,,, op(x,,2,,, ..., op(x,,n-1,,, x,,n,,)...))

       where `x1, ..., xn` are the elements of this mutable queue.

     Definition Classes
       LinearSeqOptimized → IterableLike → TraversableOnce → GenTraversableOnce
     Exceptions thrown
       `UnsupportedOperationException`

       if this mutable queue is empty.

157. #### def reduceRightOption[B >: A](op: (A, B) ⇒ B): Option[B]

     Optionally applies a binary operator to all elements of this mutable queue, going right to left.

     Optionally applies a binary operator to all elements of this mutable 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 mutable queue is nonempty, `None` otherwise.

     Definition Classes
       TraversableOnce → GenTraversableOnce

158. #### def repr: MutableList[A]

     The collection of type mutable queue underlying this `TraversableLike` object.

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

     Definition Classes
       TraversableLike → GenTraversableLike

159. #### def result(): MutableList[A]

     Produces a collection from the added elements.

     Produces a collection from the added elements. The builder's contents are undefined after this operation.

     returns

       a collection containing the elements added to this builder.

     Definition Classes
       MutableList → Builder

160. #### def reverse: MutableList[A]

     Returns new mutable queue wih elements in reversed order.

     Returns new mutable queue wih elements in reversed order.

     returns

       A new mutable queue with all elements of this mutable queue in reversed order.

     Definition Classes
       SeqLike → GenSeqLike

161. #### 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 mutable queue in reversed order

     Definition Classes
       SeqLike

162. #### abstract def reverseMap[B](f: (A) ⇒ B): mutable.Queue[B]

     [use case] Builds a new collection by applying a function to all elements of this mutable queue and collecting the results in reversed order.

     [use case]

     Builds a new collection by applying a function to all elements of this mutable queue and collecting the results in reversed order.

     B

       the element type of the returned collection.

     f

       the function to apply to each element.

     returns

       a new collection of type `That` resulting from applying the given function `f` to each element of this mutable 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.

     Definition Classes
       GenSeqLike

163. #### def reverseMap[B, That](f: (A) ⇒ B)(implicit bf: CanBuildFrom[MutableList[A], B, That]): That

     Builds a new collection by applying a function to all elements of this mutable queue and collecting the results in reversed order.

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

     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.

     f

       the function to apply to each 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

       a new collection of type `That` resulting from applying the given function `f` to each element of this mutable queue and collecting the results in reversed order.

     Definition Classes
       SeqLike → GenSeqLike

164. #### def reversed: List[A]

     Attributes
       protected[this]
     Definition Classes
       TraversableOnce

165. #### abstract def sameElements(that: GenIterable[A]): Boolean

     [use case] Checks if the other iterable collection contains the same elements in the same order as this mutable queue.

     [use case]

     Checks if the other iterable collection contains the same elements in the same order as this mutable queue.

     that

       the collection to compare with.

     returns

       `true`, if both collections contain the same elements in the same order, `false` otherwise.

     Definition Classes
       GenIterableLike

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

     Checks if the other iterable collection contains the same elements in the same order as this mutable queue.

     Checks if the other iterable collection contains the same elements in the same order as this mutable queue.

     B

       the type of the elements of collection `that`.

     that

       the collection to compare with.

     returns

       `true`, if both collections contain the same elements in the same order, `false` otherwise.

     Definition Classes
       LinearSeqOptimized → IterableLike → GenIterableLike

167. #### def scan[B >: A, That](z: B)(op: (B, B) ⇒ B)(implicit cbf: CanBuildFrom[MutableList[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 mutable queue containing the prefix scan of the elements in this mutable queue

     Definition Classes
       TraversableLike → GenTraversableLike

168. #### def scanLeft[B, That](z: B)(op: (B, A) ⇒ B)(implicit bf: CanBuildFrom[MutableList[A], B, That]): That

     Produces a collection containing cummulative results of applying the operator going left to right.

     Produces a collection containing cummulative 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

169. #### def scanRight[B, That](z: B)(op: (A, B) ⇒ B)(implicit bf: CanBuildFrom[MutableList[A], B, That]): That

     Produces a collection containing cummulative results of applying the operator going right to left.

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

170. #### 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 mutable queue starting from index `from` such that every element of the segment satisfies the predicate `p`.

     Definition Classes
       LinearSeqOptimized → SeqLike → GenSeqLike

171. #### def seq: Seq[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
       Seq → Seq → GenSeq → Iterable → Iterable → GenIterable → Traversable → Traversable → GenTraversable → Parallelizable → TraversableOnce → GenTraversableOnce

172. #### def size: Int

     The size of this mutable queue, equivalent to `length`.

     The size of this mutable queue, equivalent to `length`.

     returns

       the number of elements in this mutable queue.

     Definition Classes
       SeqLike → GenTraversableLike → TraversableOnce → GenTraversableOnce

173. #### def sizeHint(coll: scala.collection.TraversableLike[_, _], delta: Int = 0): Unit

     Gives a hint that one expects the `result` of this builder to have the same size as the given collection, plus some delta.

     Gives a hint that one expects the `result` of this builder to have the same size as the given collection, plus some delta. This will provide a hint only if the collection is known to have a cheap `size` method. Currently this is assumed to be the case if and only if the collection is of type `IndexedSeqLike`. Some builder classes will optimize their representation based on the hint. However, builder implementations are still required to work correctly even if the hint is wrong, i.e. a different number of elements is added.

     coll

       the collection which serves as a hint for the result's size.

     delta

       a correction to add to the `coll.size` to produce the size hint.

     Definition Classes
       Builder

174. #### def sizeHint(size: Int): Unit

     Gives a hint how many elements are expected to be added when the next `result` is called.

     Gives a hint how many elements are expected to be added when the next `result` is called. Some builder classes will optimize their representation based on the hint. However, builder implementations are still required to work correctly even if the hint is wrong, i.e. a different number of elements is added.

     size

       the hint how many elements will be added.

     Definition Classes
       Builder

175. #### def sizeHintBounded(size: Int, boundingColl: scala.collection.TraversableLike[_, _]): Unit

     Gives a hint how many elements are expected to be added when the next `result` is called, together with an upper bound given by the size of some other collection.

     Gives a hint how many elements are expected to be added when the next `result` is called, together with an upper bound given by the size of some other collection. Some builder classes will optimize their representation based on the hint. However, builder implementations are still required to work correctly even if the hint is wrong, i.e. a different number of elements is added.

     size

       the hint how many elements will be added.

     boundingColl

       the bounding collection. If it is an IndexedSeqLike, then sizes larger than collection's size are reduced.

     Definition Classes
       Builder

176. #### def slice(from: Int, until: Int): MutableList[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

     from

       the lowest index to include from this mutable queue.

     until

       the highest index to EXCLUDE from this mutable queue.

     returns

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

     Definition Classes
       LinearSeqOptimized → IterableLike → TraversableLike → GenTraversableLike

177. #### def sliding[B >: A](size: Int, step: Int): Iterator[MutableList[A]]

     Definition Classes
       IterableLike

178. #### def sliding[B >: A](size: Int): Iterator[MutableList[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 mutable 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

       Iterator#sliding

179. #### def sortBy[B](f: (A) ⇒ B)(implicit ord: Ordering[B]): MutableList[A]

     Sorts this mutable.

     Sorts this mutable.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 mutable queue consisting of the elements of this mutable 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

180. #### def sortWith(lt: (A, A) ⇒ Boolean): MutableList[A]

     Sorts this mutable queue according to a comparison function.

     Sorts this mutable queue according to a comparison function.

     The sort is stable. That is, elements that are equal wrt `lt` appear in the same order in the sorted sequence as in the original.

     lt

       the comparison function which tests whether its first argument precedes its second argument in the desired ordering.

     returns

       a mutable queue consisting of the elements of this mutable 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")

181. #### def sorted[B >: A](implicit ord: Ordering[B]): MutableList[A]

     Sorts this mutable queue according to an Ordering.

     Sorts this mutable queue according to an Ordering.

     The sort is stable. That is, elements that are equal wrt `lt` appear in the same order in the sorted sequence as in the original.

     ord

       the ordering to be used to compare elements.

     returns

       a mutable queue consisting of the elements of this mutable queue sorted according to the ordering `ord`.

     Definition Classes
       SeqLike
     See also

       scala.math.Ordering

182. #### def span(p: (A) ⇒ Boolean): (MutableList[A], MutableList[A])

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

     Splits this mutable 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.

     p

       the test predicate

     returns

       a pair consisting of the longest prefix of this mutable queue whose elements all satisfy `p`, and the rest of this mutable queue.

     Definition Classes
       LinearSeqOptimized → TraversableLike → GenTraversableLike

183. #### def splitAt(n: Int): (MutableList[A], MutableList[A])

     Splits this mutable queue into two at a given position.

     Splits this mutable 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 mutable queues consisting of the first `n` elements of this mutable queue, and the other elements.

     Definition Classes
       TraversableLike → GenTraversableLike

184. #### def startsWith[B](that: GenSeq[B], offset: Int): Boolean

     Tests whether this mutable queue contains the given sequence at a given index.

     Tests whether this mutable queue contains the given sequence at a given index.

     If the both the receiver object, `this` and the argument, `that` are infinite sequences this method may not terminate.

     that

       the sequence to test

     offset

       the index where the sequence is searched.

     returns

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

     Definition Classes
       SeqLike → GenSeqLike

185. #### def startsWith[B](that: GenSeq[B]): Boolean

     Tests whether this mutable queue starts with the given sequence.

     Tests whether this mutable 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

186. #### def stringPrefix: String

     Defines the prefix of this object's `toString` representation.

     Defines the prefix of this object's `toString` representation.

     returns

       a string representation which starts the result of `toString` applied to this mutable queue. By default the string prefix is the simple name of the collection class mutable queue.

     Definition Classes
       TraversableLike → GenTraversableLike

187. #### abstract 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 of this mutable queue with respect to the `+` operator in `num`.

     Definition Classes
       GenTraversableOnce

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

     Sums up the elements of this collection.

     Sums up the elements of this collection.

     B

       the result type of the `+` operator.

     num

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

     returns

       the sum of all elements of this mutable queue with respect to the `+` operator in `num`.

     Definition Classes
       TraversableOnce → GenTraversableOnce

189. #### final def synchronized[T0](arg0: ⇒ T0): T0

     Definition Classes
       AnyRef

190. #### def tail: MutableList[A]

     Returns the rest of this list

     Returns the rest of this list

     returns

       a mutable queue consisting of all elements of this mutable queue except the first one.

     Definition Classes
       MutableList → LinearSeqOptimized → TraversableLike → GenTraversableLike

191. #### def tails: Iterator[MutableList[A]]

     Iterates over the tails of this mutable queue.

     Iterates over the tails of this mutable queue. The first value will be this mutable queue and the final one will be an empty mutable queue, with the intervening values the results of successive applications of `tail`.

     returns

       an iterator over all the tails of this mutable queue

     Definition Classes
       TraversableLike
     Example:

     1. `List(1,2,3).tails = Iterator(List(1,2,3), List(2,3), List(3), Nil)`

192. #### def take(n: Int): MutableList[A]

     Selects first n elements.

     Selects first n elements.

     n

       Tt number of elements to take from this mutable queue.

     returns

       a mutable queue consisting only of the first `n` elements of this mutable queue, or else the whole mutable queue, if it has less than `n` elements.

     Definition Classes
       LinearSeqOptimized → IterableLike → TraversableLike → GenTraversableLike

193. #### def takeRight(n: Int): MutableList[A]

     Selects last n elements.

     Selects last n elements.

     n

       the number of elements to take

     returns

       a mutable queue consisting only of the last `n` elements of this mutable queue, or else the whole mutable queue, if it has less than `n` elements.

     Definition Classes
       IterableLike

194. #### def takeWhile(p: (A) ⇒ Boolean): MutableList[A]

     Takes longest prefix of elements that satisfy a predicate.

     Takes longest prefix of elements that satisfy a predicate.

     p

       The predicate used to test elements.

     returns

       the longest prefix of this mutable queue whose elements all satisfy the predicate `p`.

     Definition Classes
       LinearSeqOptimized → IterableLike → TraversableLike → GenTraversableLike

195. #### def thisCollection: LinearSeq[A]

     The underlying collection seen as an instance of `mutable.Queue`.

     The underlying collection seen as an instance of `mutable.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

196. #### abstract def toArray: Array[A]

     [use case] Converts this mutable queue to an array.

     [use case]

     Converts this mutable queue to an array.

     returns

       an array containing all elements of this mutable queue.

     Definition Classes
       GenTraversableOnce

197. #### def toArray[B >: A](implicit arg0: ClassManifest[B]): Array[B]

     Converts this mutable queue to an array.

     Converts this mutable queue to an array.

     B

       the type of the elements of the array. A `ClassManifest` for this type must be available.

     returns

       an array containing all elements of this mutable queue.

     Definition Classes
       TraversableOnce → GenTraversableOnce

198. #### def toBuffer[B >: A]: Buffer[B]

     Converts this mutable queue to a mutable buffer.

     Converts this mutable queue to a mutable buffer.

     returns

       a buffer containing all elements of this mutable queue.

     Definition Classes
       TraversableOnce → GenTraversableOnce

199. #### def toCollection(repr: MutableList[A]): LinearSeq[A]

     A conversion from collections of type `Repr` to `mutable.Queue` objects.

     A conversion from collections of type `Repr` to `mutable.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

200. #### def toIndexedSeq[B >: A]: IndexedSeq[B]

     Converts this mutable queue to an indexed sequence.

     Converts this mutable queue to an indexed sequence.

     returns

       an indexed sequence containing all elements of this mutable queue.

     Definition Classes
       TraversableOnce → GenTraversableOnce

201. #### def toIterable: Iterable[A]

     Converts this mutable queue to an iterable collection.

     Converts this mutable 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 mutable queue.

     Definition Classes
       IterableLike → TraversableOnce → GenTraversableOnce

202. #### def toIterator: Iterator[A]

     Returns an Iterator over the elements in this mutable queue.

     Returns an Iterator over the elements in this mutable queue. Will return the same Iterator if this instance is already an Iterator.

     returns

       an Iterator containing all elements of this mutable queue.

     Definition Classes
       TraversableLike → GenTraversableOnce

203. #### def toList: List[A]

     Returns an instance of `scala.List` containing the same sequence of elements.

     Returns an instance of `scala.List` containing the same sequence of elements.

     returns

       a list containing all elements of this mutable queue.

     Definition Classes
       MutableList → TraversableOnce → GenTraversableOnce

204. #### abstract def toMap[T, U]: Map[T, U]

     [use case] Converts this mutable queue to a map.

     [use case]

     Converts this mutable 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 containing all elements of this mutable queue.

     Definition Classes
       GenTraversableOnce

205. #### def toMap[T, U](implicit ev: <:<[A, (T, U)]): Map[T, U]

     Converts this mutable queue to a map.

     Converts this mutable 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 containing all elements of this mutable queue.

     Definition Classes
       TraversableOnce → GenTraversableOnce

206. #### def toQueue: Queue[A]

     Definition Classes
       MutableList

207. #### def toSeq: Seq[A]

     Converts this mutable queue to a sequence.

     Converts this mutable queue to a sequence.

     Overridden for efficiency.

     returns

       a sequence containing all elements of this mutable queue.

     Definition Classes
       SeqLike → GenSeqLike → TraversableOnce → GenTraversableOnce

208. #### def toSet[B >: A]: Set[B]

     Converts this mutable queue to a set.

     Converts this mutable queue to a set.

     returns

       a set containing all elements of this mutable queue.

     Definition Classes
       TraversableOnce → GenTraversableOnce

209. #### def toStream: Stream[A]

     Converts this mutable queue to a stream.

     Converts this mutable queue to a stream.

     returns

       a stream containing all elements of this mutable queue.

     Definition Classes
       IterableLike → TraversableLike → GenTraversableOnce

210. #### def toString(): String

     Converts this mutable queue to a string.

     Converts this mutable queue to a string.

     returns

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

     Definition Classes
       SeqLike → TraversableLike → AnyRef → Any

211. #### def toTraversable: Traversable[A]

     Converts this mutable queue to an unspecified Traversable.

     Converts this mutable queue to an unspecified Traversable. Will return the same collection if this instance is already Traversable.

     returns

       a Traversable containing all elements of this mutable queue.

     Definition Classes
       TraversableLike → TraversableOnce → GenTraversableOnce

212. #### def transform(f: (A) ⇒ A): Queue.this.type

     Applies a transformation function to all values contained in this sequence.

     Applies a transformation function to all values contained in this sequence. The transformation function produces new values from existing elements.

     f

       the transformation to apply

     returns

       the sequence itself.

     Definition Classes
       SeqLike

213. #### def transpose[B](implicit asTraversable: (A) ⇒ GenTraversableOnce[B]): Queue[Queue[B]]

     Transposes this mutable queue of traversable collections into a mutable queue of mutable queues.

     Transposes this mutable queue of traversable collections into a mutable queue of mutable queues.

     B

       the type of the elements of each traversable collection.

     asTraversable

       an implicit conversion which asserts that the element type of this mutable queue is a `Traversable`.

     returns

       a two-dimensional mutable queue of mutable queues which has as nth row the nth column of this mutable 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 mutable queue are not of the same size.

214. #### abstract def union(that: Seq[A]): mutable.Queue[A]

     [use case] Produces a new sequence which contains all elements of this mutable queue and also all elements of a given sequence.

     [use case]

     Produces a new sequence which contains all elements of this mutable queue and also all elements of a given sequence. `xs union ys` is equivalent to `xs ++ ys`.

     that

       the sequence to add.

     returns

       a new collection of type `That` which contains all elements of this mutable queue followed by all elements of `that`.

     Definition Classes
       SeqLike

215. #### def union[B >: A, That](that: GenSeq[B])(implicit bf: CanBuildFrom[MutableList[A], B, That]): That

     Produces a new sequence which contains all elements of this mutable queue and also all elements of a given sequence.

     Produces a new sequence which contains all elements of this mutable 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.

     B

       the element type of the returned mutable queue.

     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 sequence to add.

     bf

       an implicit value of class `CanBuildFrom` which determines the result class `That` from the current representation type `Repr` and the new element type `B`.

     returns

       a new collection of type `That` which contains all elements of this mutable queue followed by all elements of `that`.

     Definition Classes
       SeqLike → GenSeqLike

216. #### def unzip[A1, A2](implicit asPair: (A) ⇒ (A1, A2)): (Queue[A1], Queue[A2])

     Converts this mutable queue of pairs into two collections of the first and second half of each pair.

     Converts this mutable queue of pairs into two collections of the first and second half of each pair.

     asPair

       an implicit conversion which asserts that the element type of this mutable queue is a pair.

     returns

       a pair mutable queues, containing the first, respectively second half of each element pair of this mutable queue.

     Definition Classes
       GenericTraversableTemplate

217. #### def unzip3[A1, A2, A3](implicit asTriple: (A) ⇒ (A1, A2, A3)): (Queue[A1], Queue[A2], Queue[A3])

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

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

     asTriple

       an implicit conversion which asserts that the element type of this mutable queue is a triple.

     returns

       a triple mutable queues, containing the first, second, respectively third member of each element triple of this mutable queue.

     Definition Classes
       GenericTraversableTemplate

218. #### def update(n: Int, x: A): Unit

     Updates the `n`th element of this list to a new value.

     Updates the `n`th element of this list to a new value.

     n

       the index of the element to replace.

     Definition Classes
       MutableList → SeqLike
     Exceptions thrown
       IndexOutOfBoundsException

       if index does not exist.

219. #### abstract def updated(index: Int, elem: A): mutable.Queue[A]

     [use case] A copy of this mutable queue with one single replaced element.

     [use case]

     A copy of this mutable queue with one single replaced element.

     index

       the position of the replacement

     elem

       the replacing element

     returns

       a new mutable queue`which is a copy of this mutable queue with the element at position` index`replaced by` elem`.`

     Definition Classes
       GenSeqLike

220. #### def updated[B >: A, That](index: Int, elem: B)(implicit bf: CanBuildFrom[MutableList[A], B, That]): That

     A copy of this mutable queue with one single replaced element.

     A copy of this mutable queue with one single replaced element.

     B

       the element type of the returned mutable queue.

     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.

     index

       the position of the replacement

     elem

       the replacing 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

       a new mutable queue`which is a copy of this mutable queue with the element at position` index`replaced by` elem`.`

     Definition Classes
       SeqLike → GenSeqLike

221. #### def view(from: Int, until: Int): SeqView[A, MutableList[A]]

     Creates a non-strict view of a slice of this mutable queue.

     Creates a non-strict view of a slice of this mutable queue.

     Note: the difference between `view` and `slice` is that `view` produces a view of the current mutable queue, whereas `slice` produces a new mutable 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 mutable queue, starting at index `from` and extending up to (but not including) index `until`.

     Definition Classes
       SeqLike → IterableLike → TraversableLike

222. #### def view: SeqView[A, MutableList[A]]

     Creates a non-strict view of this mutable queue.

     Creates a non-strict view of this mutable queue.

     returns

       a non-strict view of this mutable queue.

     Definition Classes
       SeqLike → IterableLike → TraversableLike

223. #### final def wait(): Unit

     Definition Classes
       AnyRef
     Annotations
       @throws()

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

     Definition Classes
       AnyRef
     Annotations
       @throws()

225. #### final def wait(arg0: Long): Unit

     Definition Classes
       AnyRef
     Annotations
       @throws()

226. #### def withFilter(p: (A) ⇒ Boolean): FilterMonadic[A, MutableList[A]]

     Creates a non-strict filter of this mutable queue.

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

     Definition Classes
       TraversableLike → FilterMonadic

227. #### abstract def zip[B](that: GenIterable[B]): mutable.Queue[(A, B)]

     [use case] Returns a mutable queue formed from this mutable queue and another iterable collection by combining corresponding elements in pairs.

     [use case]

     Returns a mutable queue formed from this mutable 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 collection of type `That` containing pairs consisting of corresponding elements of this mutable queue and `that`. The length of the returned collection is the minimum of the lengths of this mutable queue and `that`.

     Definition Classes
       GenIterableLike

228. #### def zip[A1 >: A, B, That](that: GenIterable[B])(implicit bf: CanBuildFrom[MutableList[A], (A1, B), That]): That

     Returns a mutable queue formed from this mutable queue and another iterable collection by combining corresponding elements in pairs.

     Returns a mutable queue formed from this mutable 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.

     A1

       the type of the first half of the returned pairs (this is always a supertype of the collection's element type `A`).

     B

       the type of the second half of the returned pairs

     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 `(A1, B)` being admissible for that class, which means that an implicit instance of type `CanBuildFrom[Repr, (A1, B), That]`. is found.

     that

       The iterable providing the second half of each result pair

     bf

       an implicit value of class `CanBuildFrom` which determines the result class `That` from the current representation type `Repr` and the new element type `(A1, B)`.

     returns

       a new collection of type `That` containing pairs consisting of corresponding elements of this mutable queue and `that`. The length of the returned collection is the minimum of the lengths of this mutable queue and `that`.

     Definition Classes
       IterableLike → GenIterableLike

229. #### abstract def zipAll[B](that: Iterable[B], thisElem: A, thatElem: B): mutable.Queue[(A, B)]

     [use case] Returns a mutable queue formed from this mutable queue and another iterable collection by combining corresponding elements in pairs.

     [use case]

     Returns a mutable queue formed from this mutable 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.

     that

       the iterable providing the second half of each result pair

     thisElem

       the element to be used to fill up the result if this mutable queue is shorter than `that`.

     thatElem

       the element to be used to fill up the result if `that` is shorter than this mutable queue.

     returns

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

     Definition Classes
       GenIterableLike

230. #### def zipAll[B, A1 >: A, That](that: GenIterable[B], thisElem: A1, thatElem: B)(implicit bf: CanBuildFrom[MutableList[A], (A1, B), That]): That

     Returns a mutable queue formed from this mutable queue and another iterable collection by combining corresponding elements in pairs.

     Returns a mutable queue formed from this mutable 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.

     that

       the iterable providing the second half of each result pair

     thisElem

       the element to be used to fill up the result if this mutable queue is shorter than `that`.

     thatElem

       the element to be used to fill up the result if `that` is shorter than this mutable queue.

     returns

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

     Definition Classes
       IterableLike → GenIterableLike

231. #### abstract def zipWithIndex: mutable.Queue[(A, Int)]

     [use case] Zips this mutable queue with its indices.

     [use case]

     Zips this mutable queue with its indices.

     returns

       A new collection of type `That` containing pairs consisting of all elements of this mutable queue paired with their index. Indices start at `0`.

     Definition Classes
       GenIterableLike

232. #### def zipWithIndex[A1 >: A, That](implicit bf: CanBuildFrom[MutableList[A], (A1, Int), That]): That

     Zips this mutable queue with its indices.

     Zips this mutable queue with its indices.

     A1

       the type of the first half of the returned pairs (this is always a supertype of the collection's element type `A`).

     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 `(A1, Int)` being admissible for that class, which means that an implicit instance of type `CanBuildFrom[Repr, (A1, Int), That]`. is found.

     returns

       A new collection of type `That` containing pairs consisting of all elements of this mutable queue paired with their index. Indices start at `0`.

     Definition Classes
       IterableLike → GenIterableLike

### Deprecated Value Members

1. #### def elements: Iterator[A]

   Definition Classes
     IterableLike
   Annotations
     @deprecated
   Deprecated

     (Since version 2.8.0) use `iterator' instead`

2. #### def equalsWith[B](that: Seq[B])(f: (A, B) ⇒ Boolean): Boolean

   Tests whether every element of this mutable queue relates to the corresponding element of another sequence by satisfying a test predicate.

   Tests whether every element of this mutable 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

   returns

     `true` if both sequences have the same length and `p(x, y)` is `true` for all corresponding elements `x` of this mutable queue and `y` of `that`, otherwise `false`.

   Definition Classes
     SeqLike
   Annotations
     @deprecated
   Deprecated

     (Since version 2.8.0) use `corresponds` instead

3. #### def findIndexOf(p: (A) ⇒ Boolean): Int

   Returns index of the first element satisfying a predicate, or `-1`.

   Returns index of the first element satisfying a predicate, or `-1`.

   Definition Classes
     SeqLike
   Annotations
     @deprecated
   Deprecated

     (Since version 2.8.0) Use indexWhere(p) instead.

4. #### def findLastIndexOf(p: (A) ⇒ Boolean): Int

   Returns index of the last element satisfying a predicate, or -1.

   Returns index of the last element satisfying a predicate, or -1.

   Definition Classes
     SeqLike
   Annotations
     @deprecated
   Deprecated

     (Since version 2.8.0) use `lastIndexWhere` instead

5. #### def first: A

   Definition Classes
     IterableLike
   Annotations
     @deprecated
   Deprecated

     (Since version 2.8.0) use `head' instead`

6. #### def firstOption: Option[A]

   `None` if iterable is empty.

   `None` if iterable is empty.

   Definition Classes
     IterableLike
   Annotations
     @deprecated
   Deprecated

     (Since version 2.8.0) use `headOption' instead`

7. #### def projection: SeqView[A, MutableList[A]]

   returns a projection that can be used to call non-strict `filter`, `map`, and `flatMap` methods that build projections of the collection.

   returns a projection that can be used to call non-strict `filter`, `map`, and `flatMap` methods that build projections of the collection.

   Definition Classes
     SeqLike → IterableLike
   Annotations
     @deprecated
   Deprecated

     (Since version 2.8.0) use `view' instead`

8. #### def reset(): Unit

   Definition Classes
     MutableList
   Annotations
     @deprecated
   Deprecated

     (Since version 2.8.0) use clear() instead

9. #### def reversedElements: Iterator[A]

   Definition Classes
     SeqLike
   Annotations
     @deprecated
   Deprecated

     (Since version 2.8.0) use `reverseIterator' instead`

### Inherited from MutableList[A]

### Inherited from Serializable

### Inherited from Builder[A, MutableList[A]]

### Inherited from Growable[A]

### Inherited from LinearSeqOptimized[A, MutableList[A]]

### Inherited from LinearSeq[A]

### Inherited from LinearSeqLike[A, MutableList[A]]

### Inherited from Seq[A]

### Inherited from SeqLike[A, Seq[A]]

### Inherited from Cloneable[Queue[A]]

### Inherited from Seq[A]

### Inherited from SeqLike[A, MutableList[A]]

### Inherited from GenSeq[A]

### Inherited from GenSeqLike[A, MutableList[A]]

### Inherited from PartialFunction[Int, A]

### Inherited from (Int) ⇒ A

### Inherited from Iterable[A]

### Inherited from IterableLike[A, MutableList[A]]

### Inherited from Equals

### Inherited from GenIterable[A]

### Inherited from GenIterableLike[A, MutableList[A]]

### Inherited from Traversable[A]

### Inherited from Mutable

### Inherited from Traversable[A]

### Inherited from GenTraversable[A]

### Inherited from GenericTraversableTemplate[A, Queue]

### Inherited from TraversableLike[A, MutableList[A]]

### Inherited from GenTraversableLike[A, MutableList[A]]

### Inherited from Parallelizable[A, ParSeq[A]]

### Inherited from TraversableOnce[A]

### Inherited from GenTraversableOnce[A]

### Inherited from FilterMonadic[A, MutableList[A]]

### Inherited from HasNewBuilder[A, Queue[A]]

### Inherited from AnyRef

### Inherited from Any