scala.collection.mutable

# DoubleLinkedList

#### class DoubleLinkedList[A] extends LinearSeq[A] with GenericTraversableTemplate[A, DoubleLinkedList] with DoubleLinkedListLike[A, DoubleLinkedList[A]] with Serializable

This class implements double linked lists where both the head (`elem`), the tail (`next`) and a reference to the previous node (`prev`) are mutable.

A

  the type of the elements contained in this double linked list.

Annotations
  @SerialVersionUID( uid = 8144992287952814767L )
Source
  DoubleLinkedList.scala
Version

  2.8

Since

  1

See also

  "Scala's Collection Library overview" section on `Double Linked Lists` for more information.

Linear Supertypes
Serializable, Serializable, DoubleLinkedListLike[A, DoubleLinkedList[A]], LinkedListLike[A, DoubleLinkedList[A]], LinearSeq[A], LinearSeq[A], LinearSeqLike[A, LinearSeq[A]], Seq[A], SeqLike[A, DoubleLinkedList[A]], Cloneable[DoubleLinkedList[A]], Seq[A], SeqLike[A, DoubleLinkedList[A]], GenSeq[A], GenSeqLike[A, DoubleLinkedList[A]], PartialFunction[Int, A], (Int) ⇒ A, Iterable[A], Iterable[A], IterableLike[A, DoubleLinkedList[A]], Equals, GenIterable[A], GenIterableLike[A, DoubleLinkedList[A]], Traversable[A], Mutable, Traversable[A], GenTraversable[A], GenericTraversableTemplate[A, DoubleLinkedList], TraversableLike[A, DoubleLinkedList[A]], GenTraversableLike[A, DoubleLinkedList[A]], Parallelizable[A, ParSeq[A]], TraversableOnce[A], GenTraversableOnce[A], FilterMonadic[A, DoubleLinkedList[A]], HasNewBuilder[A, DoubleLinkedList[A]], AnyRef, Any
Ordering

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Inherited

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

Visibility

1. Public
2. All

### Instance Constructors

1. #### new DoubleLinkedList(elem: A, next: DoubleLinkedList[A])

   Creates a node for the double linked list.

   Creates a node for the double linked list.

   elem

     the element this node contains.

   next

     the next node in the double linked list.

2. #### new DoubleLinkedList()

### Type Members

1. #### type Self = DoubleLinkedList[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]): DoubleLinkedList[B]

   [use case] Returns a new double linked list containing the elements from the left hand operand followed by the elements from the right hand operand.

   [use case]

   Returns a new double linked list containing the elements from the left hand operand followed by the elements from the right hand operand. The element type of the double linked list 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 double linked list followed by all elements of `that`.

   Definition Classes
     GenTraversableLike

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

   Returns a new double linked list containing the elements from the left hand operand followed by the elements from the right hand operand.

   Returns a new double linked list containing the elements from the left hand operand followed by the elements from the right hand operand. The element type of the double linked list 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. In the standard library configuration, `That` is always `DoubleLinkedList[B]` because an implicit of type `CanBuildFrom[DoubleLinkedList, B, DoubleLinkedList[B]]` is defined in object `DoubleLinkedList`.

   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`. This is usually the `canBuildFrom` value defined in object `DoubleLinkedList`.

   returns

     a new collection of type `That` which contains all elements of this double linked list followed by all elements of `that`.

   Definition Classes
     TraversableLike → GenTraversableLike

6. #### def ++:[B >: A, That](that: Traversable[B])(implicit bf: CanBuildFrom[DoubleLinkedList[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. In the standard library configuration, `That` is always `DoubleLinkedList[B]` because an implicit of type `CanBuildFrom[DoubleLinkedList, B, DoubleLinkedList[B]]` is defined in object `DoubleLinkedList`.

   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`. This is usually the `canBuildFrom` value defined in object `DoubleLinkedList`.

   returns

     a new double linked list which contains all elements of this double linked list followed by all elements of `that`.

   Definition Classes
     TraversableLike

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

   [use case] Concatenates this double linked list with the elements of a traversable collection.

   [use case]

   Concatenates this double linked list 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 double linked list followed by all elements of `that`.

   Definition Classes
     TraversableLike

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

   Concatenates this double linked list with the elements of a traversable collection.

   Concatenates this double linked list 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. In the standard library configuration, `That` is always `DoubleLinkedList[B]` because an implicit of type `CanBuildFrom[DoubleLinkedList, B, DoubleLinkedList[B]]` is defined in object `DoubleLinkedList`.

   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`. This is usually the `canBuildFrom` value defined in object `DoubleLinkedList`.

   returns

     a new collection of type `That` which contains all elements of this double linked list followed by all elements of `that`.

   Definition Classes
     TraversableLike

9. #### abstract def +:(elem: A): DoubleLinkedList[A]

   [use case] A copy of the double linked list with an element prepended.

   [use case]

   A copy of the double linked list with an element prepended.

   elem

     the prepended element

   returns

     a new collection of type `That` consisting of `elem` followed by all elements of this double linked list.

   Definition Classes
     GenSeqLike

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

    A copy of the double linked list with an element prepended.

    A copy of the double linked list with an element prepended.

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

    That

      the class of the returned collection. In the standard library configuration, `That` is always `DoubleLinkedList[B]` because an implicit of type `CanBuildFrom[DoubleLinkedList, B, DoubleLinkedList[B]]` is defined in object `DoubleLinkedList`.

    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`. This is usually the `canBuildFrom` value defined in object `DoubleLinkedList`.

    returns

      a new collection of type `That` consisting of `elem` followed by all elements of this double linked list.

    Definition Classes
      SeqLike → GenSeqLike

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

    Applies a binary operator to a start value and all elements of this double linked list, going left to right.

    Applies a binary operator to a start value and all elements of this double linked list, 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 double linked list, 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 double linked list.

    Definition Classes
      TraversableOnce → GenTraversableOnce

12. #### 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

13. #### abstract def :+(elem: A): DoubleLinkedList[A]

    [use case] A copy of this double linked list with an element appended.

    [use case]

    A copy of this double linked list with an element appended.

    elem

      the appended element

    returns

      a new collection of type `That` consisting of all elements of this double linked list followed by `elem`.

    Definition Classes
      GenSeqLike

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

    A copy of this double linked list with an element appended.

    A copy of this double linked list with an element appended.

    B

      the element type of the returned double linked list.

    That

      the class of the returned collection. In the standard library configuration, `That` is always `DoubleLinkedList[B]` because an implicit of type `CanBuildFrom[DoubleLinkedList, B, DoubleLinkedList[B]]` is defined in object `DoubleLinkedList`.

    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`. This is usually the `canBuildFrom` value defined in object `DoubleLinkedList`.

    returns

      a new collection of type `That` consisting of all elements of this double linked list followed by `elem`.

    Definition Classes
      SeqLike → GenSeqLike

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

    Applies a binary operator to all elements of this double linked list and a start value, going right to left.

    Applies a binary operator to all elements of this double linked list 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 double linked list, 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 double linked list.

    Definition Classes
      TraversableOnce → GenTraversableOnce

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

    Definition Classes
      AnyRef

17. #### 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

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

    Appends all elements of this double linked list to a string builder.

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

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

    Appends all elements of this double linked list to a string builder using a separator string.

    Appends all elements of this double linked list 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 double linked list, 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

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

    Appends all elements of this double linked list to a string builder using start, end, and separator strings.

    Appends all elements of this double linked list 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 double linked list 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

21. #### 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

22. #### 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

23. #### def append(that: DoubleLinkedList[A]): DoubleLinkedList[A]

    If `this` is empty then it does nothing and returns `that`.

    If `this` is empty then it does nothing and returns `that`. Otherwise, appends `that` to `this`. The append requires a full traversal of `this`.

    Examples:

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

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

             scala> a.append(b)
             res0: scala.collection.mutable.LinkedList[Int] = LinkedList(1, 2, 1, 2)

             scala> println(a)
             LinkedList(1, 2, 1, 2)

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

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

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

           scala> println(a)
           LinkedList()

    returns

      the list after append (this is the list itself if nonempty, or list `that` if list this is empty. )

    Definition Classes
      DoubleLinkedListLike → LinkedListLike

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

    Selects an element by its index in the double linked list.

    Selects an element by its index in the double linked list.

    Example:

           scala> val x = LinkedList(1, 2, 3, 4, 5)
           x: scala.collection.mutable.LinkedList[Int] = LinkedList(1, 2, 3, 4, 5)

           scala> x(3)
           res1: Int = 4

    returns

      the element of this double linked list at index `idx`, where `0` indicates the first element.

    Definition Classes
      DoubleLinkedListLike → LinkedListLike → SeqLike → GenSeqLike
    Exceptions thrown
      `IndexOutOfBoundsException`

      if `idx` does not satisfy `0 <= idx < length`.

25. #### 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`.

26. #### 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 double linked list should be compared

    returns

      `true`, if this double linked list 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

27. #### def clone(): DoubleLinkedList[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

28. #### abstract def collect[B](pf: PartialFunction[A, B]): DoubleLinkedList[B]

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

    [use case]

    Builds a new collection by applying a partial function to all elements of this double linked list on which the function is defined.

    B

      the element type of the returned collection.

    pf

      the partial function which filters and maps the double linked list.

    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

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

    Builds a new collection by applying a partial function to all elements of this double linked list on which the function is defined.

    Builds a new collection by applying a partial function to all elements of this double linked list on which the function is defined.

    B

      the element type of the returned collection.

    That

      the class of the returned collection. In the standard library configuration, `That` is always `DoubleLinkedList[B]` because an implicit of type `CanBuildFrom[DoubleLinkedList, B, DoubleLinkedList[B]]` is defined in object `DoubleLinkedList`.

    pf

      the partial function which filters and maps the double linked list.

    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`. This is usually the `canBuildFrom` value defined in object `DoubleLinkedList`.

    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

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

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

    Finds the first element of the double linked list 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)`

31. #### def combinations(n: Int): Iterator[DoubleLinkedList[A]]

    Iterates over combinations.

    Iterates over combinations.

    returns

      An Iterator which traverses the possible n-element combinations of this double linked list.

    Definition Classes
      SeqLike
    Example:

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

32. #### def companion: GenericCompanion[DoubleLinkedList]

    The factory companion object that builds instances of class DoubleLinkedList.

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

    Definition Classes
      DoubleLinkedList → LinearSeq → LinearSeq → Seq → Seq → GenSeq → Iterable → Iterable → GenIterable → Traversable → Traversable → GenTraversable → GenericTraversableTemplate

33. #### 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

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

    Tests whether this double linked list contains a given value as an element.

    Tests whether this double linked list contains a given value as an element.

    elem

      the element to test.

    returns

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

    Definition Classes
      SeqLike

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

    Tests whether this double linked list contains a given sequence as a slice.

    Tests whether this double linked list contains a given sequence as a slice.

    that

      the sequence to test

    returns

      `true` if this double linked list contains a slice with the same elements as `that`, otherwise `false`.

    Definition Classes
      SeqLike

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

    [use case] Copies elements of this double linked list to an array.

    [use case]

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

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

    Copies elements of this double linked list to an array.

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

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

    [use case] Copies values of this double linked list to an array.

    [use case]

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

    xs

      the array to fill.

    Definition Classes
      GenTraversableOnce

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

    Copies values of this double linked list to an array.

    Copies values of this double linked list to an array. Fills the given array `xs` with values of this double linked list. Copying will stop once either the end of the current double linked list 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

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

    [use case] Copies values of this double linked list to an array.

    [use case]

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

    xs

      the array to fill.

    start

      the starting index.

    Definition Classes
      GenTraversableOnce

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

    Copies values of this double linked list to an array.

    Copies values of this double linked list to an array. Fills the given array `xs` with values of this double linked list, beginning at index `start`. Copying will stop once either the end of the current double linked list 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

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

    Copies all elements of this double linked list to a buffer.

    Copies all elements of this double linked list to a buffer.

    dest

      The buffer to which elements are copied.

    Definition Classes
      TraversableOnce

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

    Tests whether every element of this double linked list relates to the corresponding element of another sequence by satisfying a test predicate.

    Tests whether every element of this double linked list 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 double linked list and `y` of `that`, otherwise `false`.

    Definition Classes
      SeqLike → GenSeqLike

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

    Counts the number of elements in the double linked list which satisfy a predicate.

    Counts the number of elements in the double linked list which satisfy a predicate.

    p

      the predicate used to test elements.

    returns

      the number of elements satisfying the predicate `p`.

    Definition Classes
      TraversableOnce → GenTraversableOnce

45. #### abstract def diff(that: Seq[A]): DoubleLinkedList[A]

    [use case] Computes the multiset difference between this double linked list and another sequence.

    [use case]

    Computes the multiset difference between this double linked list and another sequence.

    that

      the sequence of elements to remove

    returns

      a new collection of type `That` which contains all elements of this double linked list 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

46. #### def diff[B >: A](that: GenSeq[B]): DoubleLinkedList[A]

    Computes the multiset difference between this double linked list and another sequence.

    Computes the multiset difference between this double linked list and another sequence.

    B

      the element type of the returned double linked list.

    that

      the sequence of elements to remove

    returns

      a new collection of type `That` which contains all elements of this double linked list 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

47. #### def distinct: DoubleLinkedList[A]

    Builds a new double linked list from this double linked list without any duplicate elements.

    Builds a new double linked list from this double linked list without any duplicate elements.

    returns

      A new double linked list which contains the first occurrence of every element of this double linked list.

    Definition Classes
      SeqLike → GenSeqLike

48. #### def drop(n: Int): DoubleLinkedList[A]

    Selects all elements except first n ones.

    Selects all elements except first n ones.

    n

      the number of elements to drop from this double linked list.

    returns

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

    Definition Classes
      DoubleLinkedListLike → LinkedListLike → IterableLike → TraversableLike → GenTraversableLike

49. #### def dropRight(n: Int): DoubleLinkedList[A]

    Selects all elements except last n ones.

    Selects all elements except last n ones.

    n

      The number of elements to take

    returns

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

    Definition Classes
      IterableLike

50. #### def dropWhile(p: (A) ⇒ Boolean): DoubleLinkedList[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 double linked list whose first element does not satisfy the predicate `p`.

    Definition Classes
      TraversableLike → GenTraversableLike

51. #### var elem: A

    Definition Classes
      LinkedListLike

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

    Tests whether this double linked list ends with the given sequence.

    Tests whether this double linked list ends with the given sequence.

    that

      the sequence to test

    returns

      `true` if this double linked list has `that` as a suffix, `false` otherwise.

    Definition Classes
      SeqLike → GenSeqLike

53. #### 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

54. #### 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

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

    Tests whether a predicate holds for some of the elements of this double linked list.

    Tests whether a predicate holds for some of the elements of this double linked list.

    p

      the predicate used to test elements.

    returns

      `true` if the given predicate `p` holds for some of the elements of this double linked list, otherwise `false`.

    Definition Classes
      IterableLike → TraversableLike → TraversableOnce → GenTraversableOnce

56. #### def filter(p: (A) ⇒ Boolean): DoubleLinkedList[A]

    Selects all elements of this double linked list which satisfy a predicate.

    Selects all elements of this double linked list which satisfy a predicate.

    p

      the predicate used to test elements.

    returns

      a new double linked list consisting of all elements of this double linked list that satisfy the given predicate `p`. The order of the elements is preserved.

    Definition Classes
      TraversableLike → GenTraversableLike

57. #### def filterNot(p: (A) ⇒ Boolean): DoubleLinkedList[A]

    Selects all elements of this double linked list which do not satisfy a predicate.

    Selects all elements of this double linked list which do not satisfy a predicate.

    p

      the predicate used to test elements.

    returns

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

    Definition Classes
      TraversableLike → GenTraversableLike

58. #### 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

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

    Finds the first element of the double linked list satisfying a predicate, if any.

    Finds the first element of the double linked list satisfying a predicate, if any.

    p

      the predicate used to test elements.

    returns

      an option value containing the first element in the double linked list that satisfies `p`, or `None` if none exists.

    Definition Classes
      IterableLike → TraversableLike → TraversableOnce → GenTraversableOnce

60. #### abstract def flatMap[B](f: (A) ⇒ GenTraversableOnce[B]): DoubleLinkedList[B]

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

    [use case]

    Builds a new collection by applying a function to all elements of this double linked list 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 double linked list and concatenating the results.

    Definition Classes
      GenTraversableLike

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

    Builds a new collection by applying a function to all elements of this double linked list and using the elements of the resulting collections.

    Builds a new collection by applying a function to all elements of this double linked list 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 double linked list. 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. In the standard library configuration, `That` is always `DoubleLinkedList[B]` because an implicit of type `CanBuildFrom[DoubleLinkedList, B, DoubleLinkedList[B]]` is defined in object `DoubleLinkedList`.

    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`. This is usually the `canBuildFrom` value defined in object `DoubleLinkedList`.

    returns

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

    Definition Classes
      TraversableLike → GenTraversableLike → FilterMonadic

62. #### abstract def flatten[B]: DoubleLinkedList[B]

    [use case] Converts this double linked list of traversable collections into a double linked list formed by the elements of these traversable collections.

    [use case]

    Converts this double linked list of traversable collections into a double linked list formed by the elements of these traversable collections.

    B

      the type of the elements of each traversable collection.

    returns

      a new double linked list resulting from concatenating all element double linked lists.

    Definition Classes
      GenericTraversableTemplate

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

    Folds the elements of this double linked list using the specified associative binary operator.

    Folds the elements of this double linked list 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

64. #### def foldLeft[B](z: B)(op: (B, A) ⇒ B): B

    Applies a binary operator to a start value and all elements of this double linked list, going left to right.

    Applies a binary operator to a start value and all elements of this double linked list, going left to right.

    B

      the result type of the binary operator.

    z

      the start value.

    op

      the binary operator.

    returns

      the result of inserting `op` between consecutive elements of this double linked list, 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 double linked list.

    Definition Classes
      TraversableOnce → GenTraversableOnce

65. #### def foldRight[B](z: B)(op: (A, B) ⇒ B): B

    Applies a binary operator to all elements of this double linked list and a start value, going right to left.

    Applies a binary operator to all elements of this double linked list and a start value, going right to left.

    B

      the result type of the binary operator.

    z

      the start value.

    op

      the binary operator.

    returns

      the result of inserting `op` between consecutive elements of this double linked list, 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 double linked list.

    Definition Classes
      IterableLike → TraversableOnce → GenTraversableOnce

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

    Tests whether a predicate holds for all elements of this double linked list.

    Tests whether a predicate holds for all elements of this double linked list.

    p

      the predicate used to test elements.

    returns

      `true` if the given predicate `p` holds for all elements of this double linked list, otherwise `false`.

    Definition Classes
      IterableLike → TraversableLike → TraversableOnce → GenTraversableOnce

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

    [use case] Applies a function `f` to all elements of this double linked list.

    [use case]

    Applies a function `f` to all elements of this double linked list.

    f

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

    Definition Classes
      IterableLike

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

    Applies a function `f` to all elements of this double linked list.

    Applies a function `f` to all elements of this double linked list.

    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
      LinkedListLike → IterableLike → TraversableLike → GenTraversableLike → TraversableOnce → GenTraversableOnce → FilterMonadic

69. #### def genericBuilder[B]: Builder[B, DoubleLinkedList[B]]

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

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

    Definition Classes
      GenericTraversableTemplate

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

    Definition Classes
      DoubleLinkedListLike → LinkedListLike

71. #### 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

72. #### def groupBy[K](f: (A) ⇒ K): Map[K, DoubleLinkedList[A]]

    Partitions this double linked list into a map of double linked lists according to some discriminator function.

    Partitions this double linked list into a map of double linked lists 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 double linked list.

    K

      the type of keys returned by the discriminator function.

    f

      the discriminator function.

    returns

      A map from keys to double linked lists 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 double linked list of those elements `x` for which `f(x)` equals `k`.

    Definition Classes
      TraversableLike → GenTraversableLike

73. #### def grouped(size: Int): Iterator[DoubleLinkedList[A]]

    Partitions elements in fixed size double linked lists.

    Partitions elements in fixed size double linked lists.

    size

      the number of elements per group

    returns

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

    Definition Classes
      IterableLike
    See also

      Iterator#grouped

74. #### def hasDefiniteSize: Boolean

    Tests whether this double linked list is known to have a finite size.

    Tests whether this double linked list 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

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

    Hashcodes for DoubleLinkedList produce a value from the hashcodes of all the elements of the double linked list.

    Hashcodes for DoubleLinkedList produce a value from the hashcodes of all the elements of the double linked list.

    returns

      the hash code value for this object.

    Definition Classes
      GenSeqLike → AnyRef → Any

76. #### def head: A

    Selects the first element of this double linked list.

    Selects the first element of this double linked list.

    returns

      the first element of this double linked list.

    Definition Classes
      LinkedListLike → IterableLike → GenIterableLike → TraversableLike → GenTraversableLike
    Exceptions thrown
      `NoSuchElementException`

      if the double linked list is empty.

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

    Optionally selects the first element.

    Optionally selects the first element.

    returns

      the first element of this double linked list if it is nonempty, `None` if it is empty.

    Definition Classes
      TraversableLike

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

    [use case] Finds index of first occurrence of some value in this double linked list after or at some start index.

    [use case]

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

    Definition Classes
      GenSeqLike

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

    Finds index of first occurrence of some value in this double linked list after or at some start index.

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

    Definition Classes
      GenSeqLike

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

    [use case] Finds index of first occurrence of some value in this double linked list.

    [use case]

    Finds index of first occurrence of some value in this double linked list.

    elem

      the element value to search for.

    returns

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

    Definition Classes
      GenSeqLike

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

    Finds index of first occurrence of some value in this double linked list.

    Finds index of first occurrence of some value in this double linked list.

    B

      the type of the element `elem`.

    elem

      the element value to search for.

    returns

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

    Definition Classes
      GenSeqLike

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

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

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

    Definition Classes
      SeqLike

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

    Finds first index where this double linked list contains a given sequence as a slice.

    Finds first index where this double linked list contains a given sequence as a slice.

    that

      the sequence to test

    returns

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

    Definition Classes
      SeqLike

84. #### 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 double linked list that satisfies the predicate `p`, or `-1`, if none exists.

    Definition Classes
      SeqLike → GenSeqLike

85. #### 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 double linked list that satisfies the predicate `p`, or `-1`, if none exists.

    Definition Classes
      GenSeqLike

86. #### 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 double linked list.

    Definition Classes
      SeqLike

87. #### def init: DoubleLinkedList[A]

    Selects all elements except the last.

    Selects all elements except the last.

    returns

      a double linked list consisting of all elements of this double linked list except the last one.

    Definition Classes
      TraversableLike
    Exceptions thrown
      `UnsupportedOperationException`

      if the double linked list is empty.

88. #### def inits: Iterator[DoubleLinkedList[A]]

    Iterates over the inits of this double linked list.

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

    returns

      an iterator over all the inits of this double linked list

    Definition Classes
      TraversableLike
    Example:

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

89. #### def insert(that: DoubleLinkedList[A]): Unit

    Insert linked list `that` at current position of this linked list

    Insert linked list `that` at current position of this linked list

    Definition Classes
      DoubleLinkedListLike → LinkedListLike
    Note

      this linked list must not be empty

90. #### abstract def intersect(that: Seq[A]): DoubleLinkedList[A]

    [use case] Computes the multiset intersection between this double linked list and another sequence.

    [use case]

    Computes the multiset intersection between this double linked list and another sequence.

    that

      the sequence of elements to intersect with.

    returns

      a new collection of type `That` which contains all elements of this double linked list 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

91. #### def intersect[B >: A](that: GenSeq[B]): DoubleLinkedList[A]

    Computes the multiset intersection between this double linked list and another sequence.

    Computes the multiset intersection between this double linked list and another sequence.

    B

      the element type of the returned double linked list.

    that

      the sequence of elements to intersect with.

    returns

      a new collection of type `That` which contains all elements of this double linked list 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

92. #### def isDefinedAt(idx: Int): Boolean

    Tests whether this double linked list contains given index.

    Tests whether this double linked list contains given index.

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

    idx

      the index to test

    returns

      `true` if this double linked list contains an element at position `idx`, `false` otherwise.

    Definition Classes
      GenSeqLike

93. #### def isEmpty: Boolean

    Tests whether the double linked list is empty.

    Tests whether the double linked list is empty.

    returns

      `true` if the double linked list contains no elements, `false` otherwise.

    Definition Classes
      LinkedListLike → IterableLike → GenIterableLike → TraversableLike → TraversableOnce → GenTraversableOnce

94. #### 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

95. #### final def isTraversableAgain: Boolean

    Tests whether this double linked list can be repeatedly traversed.

    Tests whether this double linked list can be repeatedly traversed.

    returns

      `true`

    Definition Classes
      GenTraversableLike → GenTraversableOnce

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

    Creates a new iterator over all elements contained in this iterable object.

    Creates a new iterator over all elements contained in this iterable object.

    returns

      the new iterator

    Definition Classes
      LinkedListLike → IterableLike → GenIterableLike

97. #### def last: A

    Selects the last element.

    Selects the last element.

    returns

      The last element of this double linked list.

    Definition Classes
      TraversableLike
    Exceptions thrown
      NoSuchElementException

      If the double linked list is empty.

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

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

    [use case]

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

    Definition Classes
      GenSeqLike

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

    Finds index of last occurrence of some value in this double linked list before or at a given end index.

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

    Definition Classes
      GenSeqLike

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

     [use case] Finds index of last occurrence of some value in this double linked list.

     [use case]

     Finds index of last occurrence of some value in this double linked list.

     elem

       the element value to search for.

     returns

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

     Definition Classes
       GenSeqLike

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

     Finds index of last occurrence of some value in this double linked list.

     Finds index of last occurrence of some value in this double linked list.

     B

       the type of the element `elem`.

     elem

       the element value to search for.

     returns

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

     Definition Classes
       GenSeqLike

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

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

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

     Definition Classes
       SeqLike

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

     Finds last index where this double linked list contains a given sequence as a slice.

     Finds last index where this double linked list contains a given sequence as a slice.

     that

       the sequence to test

     returns

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

     Definition Classes
       SeqLike

104. #### 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 double linked list that satisfies the predicate `p`, or `-1`, if none exists.

     Definition Classes
       SeqLike → GenSeqLike

105. #### 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 double linked list that satisfies the predicate `p`, or `-1`, if none exists.

     Definition Classes
       GenSeqLike

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

     Optionally selects the last element.

     Optionally selects the last element.

     returns

       the last element of this double linked list$ if it is nonempty, `None` if it is empty.

     Definition Classes
       TraversableLike

107. #### def length: Int

     Determines the length of this double linked list by traversing and counting every node.

     Determines the length of this double linked list by traversing and counting every node.

     returns

       the number of elements in this double linked list.

     Definition Classes
       LinkedListLike → SeqLike → GenSeqLike

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

     Compares the length of this double linked list to a test value.

     Compares the length of this double linked list to a test value.

     len

       the test value that gets compared with the length.

     returns

       A value `x` where

                  x <  0       if this.length <  len
                  x == 0       if this.length == len
                  x >  0       if this.length >  len

       The method as implemented here does not call `length` directly; its running time is `O(length min len)` instead of `O(length)`. The method should be overwritten if computing `length` is cheap.

     Definition Classes
       SeqLike

109. #### 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

110. #### abstract def map[B](f: (A) ⇒ B): DoubleLinkedList[B]

     [use case] Builds a new collection by applying a function to all elements of this double linked list.

     [use case]

     Builds a new collection by applying a function to all elements of this double linked list.

     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 double linked list and collecting the results.

     Definition Classes
       GenTraversableLike

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

     Builds a new collection by applying a function to all elements of this double linked list.

     Builds a new collection by applying a function to all elements of this double linked list.

     B

       the element type of the returned collection.

     That

       the class of the returned collection. In the standard library configuration, `That` is always `DoubleLinkedList[B]` because an implicit of type `CanBuildFrom[DoubleLinkedList, B, DoubleLinkedList[B]]` is defined in object `DoubleLinkedList`.

     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`. This is usually the `canBuildFrom` value defined in object `DoubleLinkedList`.

     returns

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

     Definition Classes
       TraversableLike → GenTraversableLike → FilterMonadic

112. #### abstract def max: A

     [use case] Finds the largest element.

     [use case]

     Finds the largest element.

     returns

       the largest element of this double linked list with respect to the ordering `cmp`.

     Definition Classes
       GenTraversableOnce

113. #### 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 double linked list with respect to the ordering `cmp`.

     Definition Classes
       TraversableOnce → GenTraversableOnce

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

     Definition Classes
       TraversableOnce → GenTraversableOnce

115. #### abstract def min: A

     [use case] Finds the smallest element.

     [use case]

     Finds the smallest element.

     returns

       the smallest element of this double linked list with respect to the ordering `cmp`.

     Definition Classes
       GenTraversableOnce

116. #### 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 double linked list with respect to the ordering `cmp`.

     Definition Classes
       TraversableOnce → GenTraversableOnce

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

     Definition Classes
       TraversableOnce → GenTraversableOnce

118. #### def mkString: String

     Displays all elements of this double linked list in a string.

     Displays all elements of this double linked list in a string.

     returns

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

     Definition Classes
       TraversableOnce → GenTraversableOnce

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

     Displays all elements of this double linked list in a string using a separator string.

     Displays all elements of this double linked list in a string using a separator string.

     sep

       the separator string.

     returns

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

     Definition Classes
       TraversableOnce → GenTraversableOnce
     Example:

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

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

     Displays all elements of this double linked list in a string using start, end, and separator strings.

     Displays all elements of this double linked list 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 double linked list. 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 double linked list are separated by the string `sep`.

     Definition Classes
       TraversableOnce → GenTraversableOnce
     Example:

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

121. #### 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

122. #### def newBuilder: Builder[A, DoubleLinkedList[A]]

     The builder that builds instances of type DoubleLinkedList[A]

     The builder that builds instances of type DoubleLinkedList[A]

     Attributes
       protected[this]
     Definition Classes
       GenericTraversableTemplate → HasNewBuilder

123. #### var next: DoubleLinkedList[A]

     Definition Classes
       LinkedListLike

124. #### def nonEmpty: Boolean

     Tests whether the double linked list is not empty.

     Tests whether the double linked list is not empty.

     returns

       `true` if the double linked list contains at least one element, `false` otherwise.

     Definition Classes
       TraversableOnce → GenTraversableOnce

125. #### 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

126. #### 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

127. #### 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

128. #### abstract def padTo(len: Int, elem: A): DoubleLinkedList[A]

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

     [use case]

     A copy of this double linked list 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 double linked list followed by the minimal number of occurrences of `elem` so that the resulting collection has a length of at least `len`.

     Definition Classes
       GenSeqLike

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

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

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

     B

       the element type of the returned double linked list.

     That

       the class of the returned collection. In the standard library configuration, `That` is always `DoubleLinkedList[B]` because an implicit of type `CanBuildFrom[DoubleLinkedList, B, DoubleLinkedList[B]]` is defined in object `DoubleLinkedList`.

     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`. This is usually the `canBuildFrom` value defined in object `DoubleLinkedList`.

     returns

       a new collection of type `That` consisting of all elements of this double linked list 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

130. #### 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

131. #### 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

132. #### def partition(p: (A) ⇒ Boolean): (DoubleLinkedList[A], DoubleLinkedList[A])

     Partitions this double linked list in two double linked lists according to a predicate.

     Partitions this double linked list in two double linked lists according to a predicate.

     p

       the predicate on which to partition.

     returns

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

     Definition Classes
       TraversableLike → GenTraversableLike

133. #### abstract def patch(from: Int, that: GenSeq[A], replaced: Int): DoubleLinkedList[A]

     [use case] Produces a new double linked list where a slice of elements in this double linked list is replaced by another sequence.

     [use case]

     Produces a new double linked list where a slice of elements in this double linked list is replaced by another sequence.

     from

       the index of the first replaced element

     replaced

       the number of elements to drop in the original double linked list

     returns

       a new double linked list consisting of all elements of this double linked list except that `replaced` elements starting from `from` are replaced by `patch`.

     Definition Classes
       GenSeqLike

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

     Produces a new double linked list where a slice of elements in this double linked list is replaced by another sequence.

     Produces a new double linked list where a slice of elements in this double linked list is replaced by another sequence.

     B

       the element type of the returned double linked list.

     That

       the class of the returned collection. In the standard library configuration, `That` is always `DoubleLinkedList[B]` because an implicit of type `CanBuildFrom[DoubleLinkedList, B, DoubleLinkedList[B]]` is defined in object `DoubleLinkedList`.

     from

       the index of the first replaced element

     patch

       the replacement sequence

     replaced

       the number of elements to drop in the original double linked list

     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`. This is usually the `canBuildFrom` value defined in object `DoubleLinkedList`.

     returns

       a new double linked list consisting of all elements of this double linked list except that `replaced` elements starting from `from` are replaced by `patch`.

     Definition Classes
       SeqLike → GenSeqLike

135. #### def permutations: Iterator[DoubleLinkedList[A]]

     Iterates over distinct permutations.

     Iterates over distinct permutations.

     returns

       An Iterator which traverses the distinct permutations of this double linked list.

     Definition Classes
       SeqLike
     Example:

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

136. #### 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 double linked list such that every element of the segment satisfies the predicate `p`.

     Definition Classes
       GenSeqLike

137. #### var prev: DoubleLinkedList[A]

     A reference to the node in the linked list preceeding the current node.

     A reference to the node in the linked list preceeding the current node.

     Definition Classes
       DoubleLinkedListLike

138. #### 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 double linked list with respect to the `*` operator in `num`.

     Definition Classes
       GenTraversableOnce

139. #### 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 double linked list with respect to the `*` operator in `num`.

     Definition Classes
       TraversableOnce → GenTraversableOnce

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

     Reduces the elements of this double linked list using the specified associative binary operator.

     Reduces the elements of this double linked list 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 double linked list is nonempty.

     Definition Classes
       TraversableOnce → GenTraversableOnce
     Exceptions thrown
       UnsupportedOperationException

       if this double linked list is empty.

141. #### def reduceLeft[B >: A](op: (B, A) ⇒ B): B

     Definition Classes
       TraversableOnce

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

     Optionally applies a binary operator to all elements of this double linked list, going left to right.

     Optionally applies a binary operator to all elements of this double linked list, 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 double linked list is nonempty, `None` otherwise.

     Definition Classes
       TraversableOnce → GenTraversableOnce

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

     Reduces the elements of this double linked list, if any, using the specified associative binary operator.

     Reduces the elements of this double linked list, 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

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

     Applies a binary operator to all elements of this double linked list, going right to left.

     Applies a binary operator to all elements of this double linked list, 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 double linked list, going right to left:

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

       where `x1, ..., xn` are the elements of this double linked list.

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

       if this double linked list is empty.

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

     Optionally applies a binary operator to all elements of this double linked list, going right to left.

     Optionally applies a binary operator to all elements of this double linked list, 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 double linked list is nonempty, `None` otherwise.

     Definition Classes
       TraversableOnce → GenTraversableOnce

146. #### def remove(): Unit

     Removes the current node from the double linked list.

     Removes the current node from the double linked list. If the node was chained into a double linked list, it will no longer be a part of it. If the node was the last node in the list, i.e. a sentinel, this method does nothing.

     Note: this method will not set the fields `elem`, `next` or `prev` of the current node, i.e. `this` node itself will still point "into" the list it was in.

     Definition Classes
       DoubleLinkedListLike
     Annotations
       @migration
     Migration

       (Changed in version 2.9.0) Double linked list now removes the current node from the list.

147. #### def repr: DoubleLinkedList[A]

     The collection of type double linked list underlying this `TraversableLike` object.

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

     Definition Classes
       TraversableLike → GenTraversableLike

148. #### def reverse: DoubleLinkedList[A]

     Returns new double linked list wih elements in reversed order.

     Returns new double linked list wih elements in reversed order.

     returns

       A new double linked list with all elements of this double linked list in reversed order.

     Definition Classes
       SeqLike → GenSeqLike

149. #### 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 double linked list in reversed order

     Definition Classes
       SeqLike

150. #### abstract def reverseMap[B](f: (A) ⇒ B): DoubleLinkedList[B]

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

     [use case]

     Builds a new collection by applying a function to all elements of this double linked list 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 double linked list 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

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

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

     Builds a new collection by applying a function to all elements of this double linked list 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. In the standard library configuration, `That` is always `DoubleLinkedList[B]` because an implicit of type `CanBuildFrom[DoubleLinkedList, B, DoubleLinkedList[B]]` is defined in object `DoubleLinkedList`.

     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`. This is usually the `canBuildFrom` value defined in object `DoubleLinkedList`.

     returns

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

     Definition Classes
       SeqLike → GenSeqLike

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

     Attributes
       protected[this]
     Definition Classes
       TraversableOnce

153. #### 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 double linked list.

     [use case]

     Checks if the other iterable collection contains the same elements in the same order as this double linked list.

     that

       the collection to compare with.

     returns

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

     Definition Classes
       GenIterableLike

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

     Checks if the other iterable collection contains the same elements in the same order as this double linked list.

     Checks if the other iterable collection contains the same elements in the same order as this double linked list.

     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
       IterableLike → GenIterableLike

155. #### def scan[B >: A, That](z: B)(op: (B, B) ⇒ B)(implicit cbf: CanBuildFrom[DoubleLinkedList[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 double linked list containing the prefix scan of the elements in this double linked list

     Definition Classes
       TraversableLike → GenTraversableLike

156. #### def scanLeft[B, That](z: B)(op: (B, A) ⇒ B)(implicit bf: CanBuildFrom[DoubleLinkedList[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`. This is usually the `canBuildFrom` value defined in object `DoubleLinkedList`.

     returns

       collection with intermediate results

     Definition Classes
       TraversableLike → GenTraversableLike

157. #### def scanRight[B, That](z: B)(op: (A, B) ⇒ B)(implicit bf: CanBuildFrom[DoubleLinkedList[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`. This is usually the `canBuildFrom` value defined in object `DoubleLinkedList`.

     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.

158. #### 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 double linked list starting from index `from` such that every element of the segment satisfies the predicate `p`.

     Definition Classes
       SeqLike → GenSeqLike

159. #### 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

160. #### def size: Int

     The size of this double linked list, equivalent to `length`.

     The size of this double linked list, equivalent to `length`.

     returns

       the number of elements in this double linked list.

     Definition Classes
       SeqLike → GenTraversableLike → TraversableOnce → GenTraversableOnce

161. #### def slice(from: Int, until: Int): DoubleLinkedList[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 double linked list.

     until

       the highest index to EXCLUDE from this double linked list.

     returns

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

     Definition Classes
       IterableLike → TraversableLike → GenTraversableLike

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

     Definition Classes
       IterableLike

163. #### def sliding[B >: A](size: Int): Iterator[DoubleLinkedList[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 double linked lists 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

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

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

     Sorts this DoubleLinkedList 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 double linked list consisting of the elements of this double linked list 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

165. #### def sortWith(lt: (A, A) ⇒ Boolean): DoubleLinkedList[A]

     Sorts this double linked list according to a comparison function.

     Sorts this double linked list 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 double linked list consisting of the elements of this double linked list 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")

166. #### def sorted[B >: A](implicit ord: Ordering[B]): DoubleLinkedList[A]

     Sorts this double linked list according to an Ordering.

     Sorts this double linked list 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 double linked list consisting of the elements of this double linked list sorted according to the ordering `ord`.

     Definition Classes
       SeqLike
     See also

       scala.math.Ordering

167. #### def span(p: (A) ⇒ Boolean): (DoubleLinkedList[A], DoubleLinkedList[A])

     Splits this double linked list into a prefix/suffix pair according to a predicate.

     Splits this double linked list 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 double linked list whose elements all satisfy `p`, and the rest of this double linked list.

     Definition Classes
       TraversableLike → GenTraversableLike

168. #### def splitAt(n: Int): (DoubleLinkedList[A], DoubleLinkedList[A])

     Splits this double linked list into two at a given position.

     Splits this double linked list 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 double linked lists consisting of the first `n` elements of this double linked list, and the other elements.

     Definition Classes
       TraversableLike → GenTraversableLike

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

     Tests whether this double linked list contains the given sequence at a given index.

     Tests whether this double linked list 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 double linked list at index `offset`, otherwise `false`.

     Definition Classes
       SeqLike → GenSeqLike

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

     Tests whether this double linked list starts with the given sequence.

     Tests whether this double linked list 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

171. #### 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 double linked list. By default the string prefix is the simple name of the collection class double linked list.

     Definition Classes
       TraversableLike → GenTraversableLike

172. #### 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 double linked list with respect to the `+` operator in `num`.

     Definition Classes
       GenTraversableOnce

173. #### 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 double linked list with respect to the `+` operator in `num`.

     Definition Classes
       TraversableOnce → GenTraversableOnce

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

     Definition Classes
       AnyRef

175. #### def tail: DoubleLinkedList[A]

     Selects all elements except the first.

     Selects all elements except the first.

     returns

       a double linked list consisting of all elements of this double linked list except the first one.

     Definition Classes
       DoubleLinkedListLike → LinkedListLike → TraversableLike → GenTraversableLike
     Exceptions thrown
       `UnsupportedOperationException`

       if the double linked list is empty.

176. #### def tails: Iterator[DoubleLinkedList[A]]

     Iterates over the tails of this double linked list.

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

     returns

       an iterator over all the tails of this double linked list

     Definition Classes
       TraversableLike
     Example:

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

177. #### def take(n: Int): DoubleLinkedList[A]

     Selects first n elements.

     Selects first n elements.

     n

       Tt number of elements to take from this double linked list.

     returns

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

     Definition Classes
       IterableLike → TraversableLike → GenTraversableLike

178. #### def takeRight(n: Int): DoubleLinkedList[A]

     Selects last n elements.

     Selects last n elements.

     n

       the number of elements to take

     returns

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

     Definition Classes
       IterableLike

179. #### def takeWhile(p: (A) ⇒ Boolean): DoubleLinkedList[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 double linked list whose elements all satisfy the predicate `p`.

     Definition Classes
       IterableLike → TraversableLike → GenTraversableLike

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

     The underlying collection seen as an instance of `DoubleLinkedList`.

     The underlying collection seen as an instance of `DoubleLinkedList`. 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

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

     [use case] Converts this double linked list to an array.

     [use case]

     Converts this double linked list to an array.

     returns

       an array containing all elements of this double linked list.

     Definition Classes
       GenTraversableOnce

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

     Converts this double linked list to an array.

     Converts this double linked list 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 double linked list.

     Definition Classes
       TraversableOnce → GenTraversableOnce

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

     Converts this double linked list to a mutable buffer.

     Converts this double linked list to a mutable buffer.

     returns

       a buffer containing all elements of this double linked list.

     Definition Classes
       TraversableOnce → GenTraversableOnce

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

     A conversion from collections of type `Repr` to `DoubleLinkedList` objects.

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

     Attributes
       protected[this]
     Definition Classes
       LinearSeqLike → SeqLike → IterableLike → TraversableLike

185. #### def toCollection(repr: DoubleLinkedList[A]): Seq[A]

     A conversion from collections of type `Repr` to `DoubleLinkedList` objects.

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

     Attributes
       protected[this]
     Definition Classes
       SeqLike → IterableLike → TraversableLike

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

     Converts this double linked list to an indexed sequence.

     Converts this double linked list to an indexed sequence.

     returns

       an indexed sequence containing all elements of this double linked list.

     Definition Classes
       TraversableOnce → GenTraversableOnce

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

     Converts this double linked list to an iterable collection.

     Converts this double linked list 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 double linked list.

     Definition Classes
       IterableLike → TraversableOnce → GenTraversableOnce

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

     Returns an Iterator over the elements in this double linked list.

     Returns an Iterator over the elements in this double linked list. Will return the same Iterator if this instance is already an Iterator.

     returns

       an Iterator containing all elements of this double linked list.

     Definition Classes
       TraversableLike → GenTraversableOnce

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

     Converts this double linked list to a list.

     Converts this double linked list to a list.

     returns

       a list containing all elements of this double linked list.

     Definition Classes
       TraversableOnce → GenTraversableOnce

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

     [use case] Converts this double linked list to a map.

     [use case]

     Converts this double linked list 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 double linked list.

     Definition Classes
       GenTraversableOnce

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

     Converts this double linked list to a map.

     Converts this double linked list 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 double linked list.

     Definition Classes
       TraversableOnce → GenTraversableOnce

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

     Converts this double linked list to a sequence.

     Converts this double linked list to a sequence.

     Overridden for efficiency.

     returns

       a sequence containing all elements of this double linked list.

     Definition Classes
       SeqLike → GenSeqLike → TraversableOnce → GenTraversableOnce

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

     Converts this double linked list to a set.

     Converts this double linked list to a set.

     returns

       a set containing all elements of this double linked list.

     Definition Classes
       TraversableOnce → GenTraversableOnce

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

     Converts this double linked list to a stream.

     Converts this double linked list to a stream.

     returns

       a stream containing all elements of this double linked list.

     Definition Classes
       IterableLike → TraversableLike → GenTraversableOnce

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

     Converts this double linked list to a string.

     Converts this double linked list to a string.

     returns

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

     Definition Classes
       SeqLike → TraversableLike → AnyRef → Any

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

     Converts this double linked list to an unspecified Traversable.

     Converts this double linked list to an unspecified Traversable. Will return the same collection if this instance is already Traversable.

     returns

       a Traversable containing all elements of this double linked list.

     Definition Classes
       TraversableLike → TraversableOnce → GenTraversableOnce

197. #### def transform(f: (A) ⇒ A): DoubleLinkedList.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

198. #### def transpose[B](implicit asTraversable: (A) ⇒ GenTraversableOnce[B]): DoubleLinkedList[DoubleLinkedList[B]]

     Transposes this double linked list of traversable collections into a double linked list of double linked lists.

     Transposes this double linked list of traversable collections into a double linked list of double linked lists.

     B

       the type of the elements of each traversable collection.

     asTraversable

       an implicit conversion which asserts that the element type of this double linked list is a `Traversable`.

     returns

       a two-dimensional double linked list of double linked lists which has as nth row the nth column of this double linked list.

     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 double linked list are not of the same size.

199. #### abstract def union(that: Seq[A]): DoubleLinkedList[A]

     [use case] Produces a new sequence which contains all elements of this double linked list and also all elements of a given sequence.

     [use case]

     Produces a new sequence which contains all elements of this double linked list 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 double linked list followed by all elements of `that`.

     Definition Classes
       SeqLike

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

     Produces a new sequence which contains all elements of this double linked list and also all elements of a given sequence.

     Produces a new sequence which contains all elements of this double linked list 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 double linked list.

     That

       the class of the returned collection. In the standard library configuration, `That` is always `DoubleLinkedList[B]` because an implicit of type `CanBuildFrom[DoubleLinkedList, B, DoubleLinkedList[B]]` is defined in object `DoubleLinkedList`.

     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`. This is usually the `canBuildFrom` value defined in object `DoubleLinkedList`.

     returns

       a new collection of type `That` which contains all elements of this double linked list followed by all elements of `that`.

     Definition Classes
       SeqLike → GenSeqLike

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

     Converts this double linked list of pairs into two collections of the first and second half of each pair.

     Converts this double linked list 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 double linked list is a pair.

     returns

       a pair double linked lists, containing the first, respectively second half of each element pair of this double linked list.

     Definition Classes
       GenericTraversableTemplate

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

     Converts this double linked list of triples into three collections of the first, second, and third element of each triple.

     Converts this double linked list 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 double linked list is a triple.

     returns

       a triple double linked lists, containing the first, second, respectively third member of each element triple of this double linked list.

     Definition Classes
       GenericTraversableTemplate

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

     Replaces element at given index with a new value.

     Replaces element at given index with a new value.

     n

       the index of the element to replace.

     Definition Classes
       DoubleLinkedListLike → LinkedListLike → SeqLike
     Exceptions thrown
       IndexOutOfBoundsException

       if the index is not valid.

204. #### abstract def updated(index: Int, elem: A): DoubleLinkedList[A]

     [use case] A copy of this double linked list with one single replaced element.

     [use case]

     A copy of this double linked list with one single replaced element.

     index

       the position of the replacement

     elem

       the replacing element

     returns

       a new double linked list`which is a copy of this double linked list with the element at position` index`replaced by` elem`.`

     Definition Classes
       GenSeqLike

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

     A copy of this double linked list with one single replaced element.

     A copy of this double linked list with one single replaced element.

     B

       the element type of the returned double linked list.

     That

       the class of the returned collection. In the standard library configuration, `That` is always `DoubleLinkedList[B]` because an implicit of type `CanBuildFrom[DoubleLinkedList, B, DoubleLinkedList[B]]` is defined in object `DoubleLinkedList`.

     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`. This is usually the `canBuildFrom` value defined in object `DoubleLinkedList`.

     returns

       a new double linked list`which is a copy of this double linked list with the element at position` index`replaced by` elem`.`

     Definition Classes
       SeqLike → GenSeqLike

206. #### def view(from: Int, until: Int): SeqView[A, DoubleLinkedList[A]]

     Creates a non-strict view of a slice of this double linked list.

     Creates a non-strict view of a slice of this double linked list.

     Note: the difference between `view` and `slice` is that `view` produces a view of the current double linked list, whereas `slice` produces a new double linked list.

     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 double linked list, starting at index `from` and extending up to (but not including) index `until`.

     Definition Classes
       SeqLike → IterableLike → TraversableLike

207. #### def view: SeqView[A, DoubleLinkedList[A]]

     Creates a non-strict view of this double linked list.

     Creates a non-strict view of this double linked list.

     returns

       a non-strict view of this double linked list.

     Definition Classes
       SeqLike → IterableLike → TraversableLike

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

     Definition Classes
       AnyRef
     Annotations
       @throws()

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

     Definition Classes
       AnyRef
     Annotations
       @throws()

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

     Definition Classes
       AnyRef
     Annotations
       @throws()

211. #### def withFilter(p: (A) ⇒ Boolean): FilterMonadic[A, DoubleLinkedList[A]]

     Creates a non-strict filter of this double linked list.

     Creates a non-strict filter of this double linked list.

     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 double linked list which satisfy the predicate `p`.

     Definition Classes
       TraversableLike → FilterMonadic

212. #### abstract def zip[B](that: GenIterable[B]): DoubleLinkedList[(A, B)]

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

     [use case]

     Returns a double linked list formed from this double linked list 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 double linked list and `that`. The length of the returned collection is the minimum of the lengths of this double linked list and `that`.

     Definition Classes
       GenIterableLike

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

     Returns a double linked list formed from this double linked list and another iterable collection by combining corresponding elements in pairs.

     Returns a double linked list formed from this double linked list 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 double linked list and `that`. The length of the returned collection is the minimum of the lengths of this double linked list and `that`.

     Definition Classes
       IterableLike → GenIterableLike

214. #### abstract def zipAll[B](that: Iterable[B], thisElem: A, thatElem: B): DoubleLinkedList[(A, B)]

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

     [use case]

     Returns a double linked list formed from this double linked list 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 double linked list is shorter than `that`.

     thatElem

       the element to be used to fill up the result if `that` is shorter than this double linked list.

     returns

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

     Definition Classes
       GenIterableLike

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

     Returns a double linked list formed from this double linked list and another iterable collection by combining corresponding elements in pairs.

     Returns a double linked list formed from this double linked list 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 double linked list is shorter than `that`.

     thatElem

       the element to be used to fill up the result if `that` is shorter than this double linked list.

     returns

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

     Definition Classes
       IterableLike → GenIterableLike

216. #### abstract def zipWithIndex: DoubleLinkedList[(A, Int)]

     [use case] Zips this double linked list with its indices.

     [use case]

     Zips this double linked list with its indices.

     returns

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

     Definition Classes
       GenIterableLike

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

     Zips this double linked list with its indices.

     Zips this double linked list 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 double linked list 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 double linked list relates to the corresponding element of another sequence by satisfying a test predicate.

   Tests whether every element of this double linked list 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 double linked list 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, DoubleLinkedList[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 reversedElements: Iterator[A]

   Definition Classes
     SeqLike
   Annotations
     @deprecated
   Deprecated

     (Since version 2.8.0) use `reverseIterator' instead`

### Inherited from Serializable

### Inherited from DoubleLinkedListLike[A, DoubleLinkedList[A]]

### Inherited from LinkedListLike[A, DoubleLinkedList[A]]

### Inherited from LinearSeq[A]

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

### Inherited from Seq[A]

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

### Inherited from Cloneable[DoubleLinkedList[A]]

### Inherited from Seq[A]

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

### Inherited from GenSeq[A]

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

### Inherited from PartialFunction[Int, A]

### Inherited from (Int) ⇒ A

### Inherited from Iterable[A]

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

### Inherited from Equals

### Inherited from GenIterable[A]

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

### Inherited from Traversable[A]

### Inherited from Mutable

### Inherited from Traversable[A]

### Inherited from GenTraversable[A]

### Inherited from GenericTraversableTemplate[A, DoubleLinkedList]

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

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

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

### Inherited from TraversableOnce[A]

### Inherited from GenTraversableOnce[A]

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

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

### Inherited from AnyRef

### Inherited from Any