scala.collection

# TraversableViewLike

#### trait TraversableViewLike[+A, +Coll, +This <: TraversableView[A, Coll] with TraversableViewLike[A, Coll, This]] extends Traversable[A] with TraversableLike[A, This] with ViewMkString[A] with GenTraversableViewLike[A, Coll, This]

A template trait for non-strict views of traversable collections.

A view is a lazy version of some collection. Collection transformers such as `map` or `filter` or `++` do not traverse any elements when applied on a view. Instead they create a new view which simply records that fact that the operation needs to be applied. The collection elements are accessed, and the view operations are applied, when a non-view result is needed, or when the `force` method is called on a view.

All views for traversable collections are defined by creating a new `foreach` method.

Implementation note: Methods such as `map` or `flatMap` on this view will not invoke the implicitly passed `Builder` factory, but will return a new view directly, to preserve by-name behavior. The new view is then cast to the factory's result type. This means that every `CanBuildFrom` that takes a `View` as its `From` type parameter must yield the same view (or a generic superclass of it) as its result parameter. If that assumption is broken, cast errors might result.

Self Type
  TraversableViewLike[A, Coll, This]
Source
  TraversableViewLike.scala

Linear Supertypes
GenTraversableViewLike[A, Coll, This], ViewMkString[A], Traversable[A], GenTraversable[A], GenericTraversableTemplate[A, Traversable], TraversableLike[A, This], GenTraversableLike[A, This], Parallelizable[A, ParIterable[A]], TraversableOnce[A], GenTraversableOnce[A], FilterMonadic[A, This], HasNewBuilder[A, This], AnyRef, Any
Known Subclasses
Appended, Appended, Appended, Appended, DroppedWhile, DroppedWhile, DroppedWhile, DroppedWhile, DroppedWhile, EmptyView, EmptyView, EmptyView, EmptyView, Filtered, Filtered, Filtered, Filtered, Filtered, FlatMapped, FlatMapped, FlatMapped, FlatMapped, Forced, Forced, Forced, Forced, IndexedSeqView, IterableView, IterableViewLike, Mapped, Mapped, Mapped, Mapped, Patched, Patched, Prepended, Prepended, Reversed, Reversed, Reversed, SeqView, SeqViewLike, Sliced, Sliced, Sliced, Sliced, Sliced, StreamView, StreamViewLike, TakenWhile, TakenWhile, TakenWhile, TakenWhile, TakenWhile, Transformed, Transformed, Transformed, Transformed, Transformed, TraversableView, Zipped, Zipped, Zipped, ZippedAll, ZippedAll, ZippedAll
Ordering

1. Alphabetic
2. By inheritance

Inherited

1. Hide All
2. Show all

1. TraversableViewLike
2. GenTraversableViewLike
3. ViewMkString
4. Traversable
5. GenTraversable
6. GenericTraversableTemplate
7. TraversableLike
8. GenTraversableLike
9. Parallelizable
10. TraversableOnce
11. GenTraversableOnce
12. FilterMonadic
13. HasNewBuilder
14. AnyRef
15. Any

Visibility

1. Public
2. All

### Type Members

1. #### trait Appended[B >: A] extends Transformed[B] with Appended[B]

   Definition Classes
     TraversableViewLike → GenTraversableViewLike

2. #### trait DroppedWhile extends Transformed[A] with DroppedWhile

   Definition Classes
     TraversableViewLike → GenTraversableViewLike

3. #### trait EmptyView extends Transformed[Nothing] with EmptyView

   Definition Classes
     TraversableViewLike → GenTraversableViewLike

4. #### trait Filtered extends Transformed[A] with Filtered

   Definition Classes
     TraversableViewLike → GenTraversableViewLike

5. #### trait FlatMapped[B] extends Transformed[B] with FlatMapped[B]

   Definition Classes
     TraversableViewLike → GenTraversableViewLike

6. #### trait Forced[B] extends Transformed[B] with Forced[B]

   A fall back which forces everything into a vector and then applies an operation on it.

7. #### trait Mapped[B] extends Transformed[B] with Mapped[B]

   Definition Classes
     TraversableViewLike → GenTraversableViewLike

8. #### type Self = This

   The type implementing this traversable

   The type implementing this traversable

   Attributes
     protected
   Definition Classes
     TraversableLike

9. #### trait Sliced extends Transformed[A] with Sliced

   Definition Classes
     TraversableViewLike → GenTraversableViewLike

10. #### trait TakenWhile extends Transformed[A] with TakenWhile

    Definition Classes
      TraversableViewLike → GenTraversableViewLike

11. #### trait Transformed[+B] extends TraversableView[B, Coll] with Transformed[B]

    The implementation base trait of this view.

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

    A class supporting filtered operations.

### Abstract Value Members

1. #### abstract def underlying: Coll

   Attributes
     protected
   Definition Classes
     TraversableViewLike → GenTraversableViewLike

### Concrete 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 and `null`.

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

   returns

     a hash value consistent with ==

   Definition Classes
     AnyRef → Any

4. #### def ++[B](that: GenTraversableOnce[B]): CC[B]

   [use case]

   [use case]
   B

     the element type of the returned collection.

   that

     the traversable to append.

   returns

     a new collection which contains all elements of this collection followed by all elements of `that`.

   Definition Classes
     TraversableViewLike → TraversableLike → GenTraversableLike

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

   As with `++`, returns a new collection containing the elements from the left operand followed by the elements from the right operand.

   As with `++`, returns a new collection containing the elements from the left operand followed by the elements from the right operand.

   It differs from `++` in that the right operand determines the type of the resulting collection rather than the left one. Mnemonic: the COLon is on the side of the new COLlection type.

   Example:

           scala> val x = List(1)
           x: List[Int] = List(1)

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

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

   This overload exists because: for the implementation of `++:` we should reuse that of `++` because many collections override it with more efficient versions.

   Since `TraversableOnce` has no `++` method, we have to implement that directly, but `Traversable` and down can use the overload.

   B

     the element type of the returned collection.

   That

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

   that

     the traversable to append.

   bf

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

   returns

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

   Definition Classes
     TraversableLike

6. #### def ++:[B](that: TraversableOnce[B]): CC[B]

   [use case]

   [use case]
   B

     the element type of the returned collection.

   that

     the traversable to append.

   returns

     a new collection which contains all elements of this collection followed by all elements of `that`.

   Definition Classes
     TraversableLike

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

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

   Applies a binary operator to a start value and all elements of this collection, 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

   Note: will not terminate for infinite-sized collections.

   Note: might return different results for different runs, unless the underlying collection type is ordered. or the operator is associative and commutative.

   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 collection, 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 collection.

   Definition Classes
     TraversableOnce → GenTraversableOnce

8. #### 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

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

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

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

   Note: `:\` is alternate syntax for `foldRight`; `xs :\ z` is the same as `xs foldRight z`.

   Note: will not terminate for infinite-sized collections.

   Note: might return different results for different runs, unless the underlying collection type is ordered. or the operator is associative and commutative.

   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 collection, 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 collection.

   Definition Classes
     TraversableOnce → GenTraversableOnce

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

    Definition Classes
      AnyRef

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

    Test two objects for equality.

    Test two objects for equality. The expression `x == that` is equivalent to `if (x eq null) that eq null else x.equals(that)`.

    returns

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

    Definition Classes
      Any

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

    Definition Classes
      ViewMkString

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

    Appends all elements of this collection to a string builder.

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

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

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

    Appends all elements of this collection 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 collection, 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

15. #### 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

16. #### 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`.

17. #### def clone(): AnyRef

    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.

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

      not specified by SLS as a member of AnyRef

18. #### def collect[B](pf: PartialFunction[A, B]): CC[B]

    [use case]

    [use case]
    B

      the element type of the returned collection.

    pf

      the partial function which filters and maps the collection.

    returns

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

    Definition Classes
      TraversableViewLike → TraversableLike → GenTraversableLike

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

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

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

    Note: may not terminate for infinite-sized collections.

    Note: might return different results for different runs, unless the underlying collection type is ordered.

    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)`

20. #### def companion: GenericCompanion[Traversable]

    The factory companion object that builds instances of class CC.

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

    Definition Classes
      Traversable → GenTraversable → GenericTraversableTemplate

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

    [use case]

    [use case]
    xs

      the array to fill.

    start

      the starting index.

    len

      the maximal number of elements to copy.

    Definition Classes
      TraversableLike → TraversableOnce → GenTraversableOnce

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

    [use case]

    [use case]
    xs

      the array to fill.

    Definition Classes
      TraversableOnce → GenTraversableOnce

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

    [use case]

    [use case]
    xs

      the array to fill.

    start

      the starting index.

    Definition Classes
      TraversableOnce → GenTraversableOnce

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

    Copies all elements of this collection to a buffer.

    Copies all elements of this collection to a buffer.

    Note: will not terminate for infinite-sized collections.

    dest

      The buffer to which elements are copied.

    Definition Classes
      TraversableOnce

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

    Counts the number of elements in the collection which satisfy a predicate.

    Counts the number of elements in the collection which satisfy a predicate.

    p

      the predicate used to test elements.

    returns

      the number of elements satisfying the predicate `p`.

    Definition Classes
      TraversableOnce → GenTraversableOnce

26. #### def drop(n: Int): This

    Selects all elements except first n ones.

    Selects all elements except first n ones.

    Note: might return different results for different runs, unless the underlying collection type is ordered.

    n

      the number of elements to drop from this collection.

    returns

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

    Definition Classes
      TraversableViewLike → TraversableLike → GenTraversableLike

27. #### def dropWhile(p: (A) ⇒ Boolean): This

    Drops longest prefix of elements that satisfy a predicate.

    Drops longest prefix of elements that satisfy a predicate.

    Note: might return different results for different runs, unless the underlying collection type is ordered.

    p

      The predicate used to test elements.

    returns

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

    Definition Classes
      TraversableViewLike → TraversableLike → GenTraversableLike

28. #### 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

29. #### def equals(arg0: Any): Boolean

    The equality method for reference types.

    The equality method for reference types. Default implementation delegates to `eq`.

    See also `equals` in Any.

    returns

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

    Definition Classes
      AnyRef → Any

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

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

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

    Note: may not terminate for infinite-sized collections.

    p

      the predicate used to test elements.

    returns

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

    Definition Classes
      TraversableLike → TraversableOnce → GenTraversableOnce

31. #### def filter(p: (A) ⇒ Boolean): This

    Selects all elements of this collection which satisfy a predicate.

    Selects all elements of this collection which satisfy a predicate.

    p

      the predicate used to test elements.

    returns

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

    Definition Classes
      TraversableViewLike → TraversableLike → GenTraversableLike

32. #### def filterNot(p: (A) ⇒ Boolean): This

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

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

    p

      the predicate used to test elements.

    returns

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

    Definition Classes
      TraversableLike → GenTraversableLike

33. #### 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

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

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

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

    Note: may not terminate for infinite-sized collections.

    Note: might return different results for different runs, unless the underlying collection type is ordered.

    p

      the predicate used to test elements.

    returns

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

    Definition Classes
      TraversableLike → TraversableOnce → GenTraversableOnce

35. #### def flatMap[B](f: (A) ⇒ GenTraversableOnce[B]): CC[B]

    [use case]

    [use case]
    B

      the element type of the returned collection.

    f

      the function to apply to each element.

    returns

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

    Definition Classes
      TraversableViewLike → TraversableLike → GenTraversableLike → FilterMonadic

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

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

    Folds the elements of this collection 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

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

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

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

    Note: will not terminate for infinite-sized collections.

    Note: might return different results for different runs, unless the underlying collection type is ordered. or the operator is associative and commutative.

    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 collection, 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 collection.

    Definition Classes
      TraversableOnce → GenTraversableOnce

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

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

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

    Note: will not terminate for infinite-sized collections.

    Note: might return different results for different runs, unless the underlying collection type is ordered. or the operator is associative and commutative.

    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 collection, 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 collection.

    Definition Classes
      TraversableOnce → GenTraversableOnce

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

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

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

    Note: may not terminate for infinite-sized collections.

    p

      the predicate used to test elements.

    returns

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

    Definition Classes
      TraversableLike → TraversableOnce → GenTraversableOnce

40. #### def force[B >: A, That](implicit bf: CanBuildFrom[Coll, B, That]): That

    Definition Classes
      TraversableViewLike → GenTraversableViewLike

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

    [use case]

    [use case]
    f

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

    Definition Classes
      GenericTraversableTemplate

42. #### def genericBuilder[B]: Builder[B, Traversable[B]]

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

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

    Definition Classes
      GenericTraversableTemplate

43. #### final def getClass(): 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

44. #### def groupBy[K](f: (A) ⇒ K): Map[K, This]

    Partitions this collection into a map of collections according to some discriminator function.

    Partitions this collection into a map of collections 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 collection.

    K

      the type of keys returned by the discriminator function.

    f

      the discriminator function.

    returns

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

    Definition Classes
      TraversableViewLike → TraversableLike → GenTraversableLike

45. #### def hasDefiniteSize: Boolean

    Tests whether this collection is known to have a finite size.

    Tests whether this collection 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

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

    The hashCode method for reference types.

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

    returns

      the hash code value for this object.

    Definition Classes
      AnyRef → Any

47. #### def head: A

    Selects the first element of this collection.

    Selects the first element of this collection.

    Note: might return different results for different runs, unless the underlying collection type is ordered.

    returns

      the first element of this collection.

    Definition Classes
      TraversableLike → GenTraversableLike
    Exceptions thrown
      `NoSuchElementException`

      if the collection is empty.

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

    Optionally selects the first element.

    Optionally selects the first element.

    Note: might return different results for different runs, unless the underlying collection type is ordered.

    returns

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

    Definition Classes
      TraversableLike

49. #### def init: This

    Selects all elements except the last.

    Selects all elements except the last.

    Note: might return different results for different runs, unless the underlying collection type is ordered.

    returns

      a collection consisting of all elements of this collection except the last one.

    Definition Classes
      TraversableViewLike → TraversableLike
    Exceptions thrown
      `UnsupportedOperationException`

      if the collection is empty.

50. #### def inits: Iterator[This]

    Iterates over the inits of this collection.

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

    returns

      an iterator over all the inits of this collection

    Definition Classes
      TraversableLike
    Example:

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

51. #### def isEmpty: Boolean

    Tests whether this collection is empty.

    Tests whether this collection is empty.

    returns

      `true` if the collection contain no elements, `false` otherwise.

    Definition Classes
      TraversableLike → TraversableOnce → GenTraversableOnce

52. #### 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

53. #### final def isTraversableAgain: Boolean

    Tests whether this collection can be repeatedly traversed.

    Tests whether this collection can be repeatedly traversed.

    returns

      `true`

    Definition Classes
      GenTraversableLike → GenTraversableOnce

54. #### def last: A

    Selects the last element.

    Selects the last element.

    Note: might return different results for different runs, unless the underlying collection type is ordered.

    returns

      The last element of this collection.

    Definition Classes
      TraversableLike
    Exceptions thrown
      NoSuchElementException

      If the collection is empty.

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

    Optionally selects the last element.

    Optionally selects the last element.

    Note: might return different results for different runs, unless the underlying collection type is ordered.

    returns

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

    Definition Classes
      TraversableLike

56. #### def map[B](f: (A) ⇒ B): CC[B]

    [use case]

    [use case]
    B

      the element type of the returned collection.

    f

      the function to apply to each element.

    returns

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

    Definition Classes
      TraversableViewLike → TraversableLike → GenTraversableLike → FilterMonadic

57. #### def max: A

    [use case]

    [use case]
    returns

      the largest element of this collection.

    Definition Classes
      TraversableOnce → GenTraversableOnce

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

    Definition Classes
      TraversableOnce → GenTraversableOnce

59. #### def min: A

    [use case]

    [use case]
    returns

      the smallest element of this collection

    Definition Classes
      TraversableOnce → GenTraversableOnce

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

    Definition Classes
      TraversableOnce → GenTraversableOnce

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

    Definition Classes
      ViewMkString

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

    Definition Classes
      ViewMkString

63. #### def mkString: String

    Definition Classes
      ViewMkString

64. #### 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

65. #### def newAppended[B >: A](that: GenTraversable[B]): Transformed[B]

    Attributes
      protected

66. #### def newBuilder: Builder[A, This]

    The builder that builds instances of type CC[A]

    The builder that builds instances of type CC[A]

    Attributes
      protected[this]
    Definition Classes
      TraversableViewLike → GenericTraversableTemplate → TraversableLike → HasNewBuilder

67. #### def newDropped(n: Int): Transformed[A]

    Attributes
      protected

68. #### def newDroppedWhile(p: (A) ⇒ Boolean): Transformed[A]

    Attributes
      protected

69. #### def newFiltered(p: (A) ⇒ Boolean): Transformed[A]

    Attributes
      protected

70. #### def newFlatMapped[B](f: (A) ⇒ GenTraversableOnce[B]): Transformed[B]

    Attributes
      protected

71. #### def newForced[B](xs: ⇒ GenSeq[B]): Transformed[B]

    Boilerplate method, to override in each subclass This method could be eliminated if Scala had virtual classes

    Boilerplate method, to override in each subclass This method could be eliminated if Scala had virtual classes

    Attributes
      protected

72. #### def newMapped[B](f: (A) ⇒ B): Transformed[B]

    Attributes
      protected

73. #### def newSliced(_endpoints: SliceInterval): Transformed[A]

    Attributes
      protected

74. #### def newTaken(n: Int): Transformed[A]

    Attributes
      protected

75. #### def newTakenWhile(p: (A) ⇒ Boolean): Transformed[A]

    Attributes
      protected

76. #### def nonEmpty: Boolean

    Tests whether the collection is not empty.

    Tests whether the collection is not empty.

    returns

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

    Definition Classes
      TraversableOnce → GenTraversableOnce

77. #### 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

78. #### 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

79. #### def par: ParIterable[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

80. #### def parCombiner: Combiner[A, ParIterable[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
      TraversableLike → Parallelizable

81. #### def partition(p: (A) ⇒ Boolean): (This, This)

    Partitions this collection in two collections according to a predicate.

    Partitions this collection in two collections according to a predicate.

    p

      the predicate on which to partition.

    returns

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

    Definition Classes
      TraversableViewLike → TraversableLike → GenTraversableLike

82. #### def product: A

    [use case]

    [use case]
    returns

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

    Definition Classes
      TraversableOnce → GenTraversableOnce

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

    Reduces the elements of this collection using the specified associative binary operator.

    Reduces the elements of this collection 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 collection is nonempty.

    Definition Classes
      TraversableOnce → GenTraversableOnce
    Exceptions thrown
      UnsupportedOperationException

      if this collection is empty.

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

    Definition Classes
      TraversableOnce

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

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

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

    Note: will not terminate for infinite-sized collections.

    Note: might return different results for different runs, unless the underlying collection type is ordered. or the operator is associative and commutative.

    B

      the result type of the binary operator.

    op

      the binary operator.

    returns

      an option value containing the result of `reduceLeft(op)` is this collection is nonempty, `None` otherwise.

    Definition Classes
      TraversableOnce → GenTraversableOnce

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

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

    Reduces the elements of this collection, 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

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

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

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

    Note: will not terminate for infinite-sized collections.

    Note: might return different results for different runs, unless the underlying collection type is ordered. or the operator is associative and commutative.

    B

      the result type of the binary operator.

    op

      the binary operator.

    returns

      the result of inserting `op` between consecutive elements of this collection, going right to left:

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

      where `x1, ..., xn` are the elements of this collection.

    Definition Classes
      TraversableOnce → GenTraversableOnce
    Exceptions thrown
      `UnsupportedOperationException`

      if this collection is empty.

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

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

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

    Note: will not terminate for infinite-sized collections.

    Note: might return different results for different runs, unless the underlying collection type is ordered. or the operator is associative and commutative.

    B

      the result type of the binary operator.

    op

      the binary operator.

    returns

      an option value containing the result of `reduceRight(op)` is this collection is nonempty, `None` otherwise.

    Definition Classes
      TraversableOnce → GenTraversableOnce

89. #### def repr: This

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

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

    Definition Classes
      TraversableLike → GenTraversableLike

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

    Attributes
      protected[this]
    Definition Classes
      TraversableOnce

91. #### def scan[B >: A, That](z: B)(op: (B, B) ⇒ B)(implicit cbf: CanBuildFrom[This, 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 collection containing the prefix scan of the elements in this collection

    Definition Classes
      TraversableLike → GenTraversableLike

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

    Note: will not terminate for infinite-sized collections.

    Note: might return different results for different runs, unless the underlying collection type is ordered.

    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 and the new element type `B`.

    returns

      collection with intermediate results

    Definition Classes
      TraversableViewLike → TraversableLike → GenTraversableLike

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

    Note: will not terminate for infinite-sized collections.

    Note: might return different results for different runs, unless the underlying collection type is ordered.

    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 and the new element type `B`.

    returns

      collection with intermediate results

    Definition Classes
      TraversableViewLike → 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.

94. #### def seq: Traversable[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
      Traversable → GenTraversable → Parallelizable → TraversableOnce → GenTraversableOnce

95. #### def size: Int

    The size of this collection.

    The size of this collection.

    Note: will not terminate for infinite-sized collections.

    returns

      the number of elements in this collection.

    Definition Classes
      TraversableOnce → GenTraversableOnce

96. #### def slice(from: Int, until: Int): This

    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

    Note: might return different results for different runs, unless the underlying collection type is ordered.

    from

      the lowest index to include from this collection.

    until

      the highest index to EXCLUDE from this collection.

    returns

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

    Definition Classes
      TraversableViewLike → TraversableLike → GenTraversableLike

97. #### def span(p: (A) ⇒ Boolean): (This, This)

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

    Splits this collection 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.

    Note: might return different results for different runs, unless the underlying collection type is ordered.

    p

      the test predicate

    returns

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

    Definition Classes
      TraversableViewLike → TraversableLike → GenTraversableLike

98. #### def splitAt(n: Int): (This, This)

    Splits this collection into two at a given position.

    Splits this collection into two at a given position. Note: `c splitAt n` is equivalent to (but possibly more efficient than) `(c take n, c drop n)`.

    Note: might return different results for different runs, unless the underlying collection type is ordered.

    n

      the position at which to split.

    returns

      a pair of collections consisting of the first `n` elements of this collection, and the other elements.

    Definition Classes
      TraversableViewLike → TraversableLike → GenTraversableLike

99. #### 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 collection. By default the string prefix is the simple name of the collection class collection.

    Definition Classes
      TraversableViewLike → TraversableLike → GenTraversableLike

100. #### def sum: A

     [use case]

     [use case]
     returns

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

     Definition Classes
       TraversableOnce → GenTraversableOnce

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

     Definition Classes
       AnyRef

102. #### def tail: This

     Selects all elements except the first.

     Selects all elements except the first.

     Note: might return different results for different runs, unless the underlying collection type is ordered.

     returns

       a collection consisting of all elements of this collection except the first one.

     Definition Classes
       TraversableLike → GenTraversableLike
     Exceptions thrown
       `UnsupportedOperationException`

       if the collection is empty.

103. #### def tails: Iterator[This]

     Iterates over the tails of this collection.

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

     returns

       an iterator over all the tails of this collection

     Definition Classes
       TraversableLike
     Example:

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

104. #### def take(n: Int): This

     Selects first n elements.

     Selects first n elements.

     Note: might return different results for different runs, unless the underlying collection type is ordered.

     n

       Tt number of elements to take from this collection.

     returns

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

     Definition Classes
       TraversableViewLike → TraversableLike → GenTraversableLike

105. #### def takeWhile(p: (A) ⇒ Boolean): This

     Takes longest prefix of elements that satisfy a predicate.

     Takes longest prefix of elements that satisfy a predicate.

     Note: might return different results for different runs, unless the underlying collection type is ordered.

     p

       The predicate used to test elements.

     returns

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

     Definition Classes
       TraversableViewLike → TraversableLike → GenTraversableLike

106. #### def thisCollection: Traversable[A]

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

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

     Attributes
       protected[this]
     Definition Classes
       TraversableLike

107. #### def thisSeq: Seq[A]

     Attributes
       protected[this]
     Definition Classes
       ViewMkString

108. #### def toArray: Array[A]

     [use case]

     [use case]
     returns

       an array containing all elements of this collection. A `ClassManifest` must be available for the element type of this collection.

     Definition Classes
       TraversableOnce → GenTraversableOnce

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

     Converts this collection to a mutable buffer.

     Converts this collection to a mutable buffer.

     Note: will not terminate for infinite-sized collections.

     returns

       a buffer containing all elements of this collection.

     Definition Classes
       TraversableOnce → GenTraversableOnce

110. #### def toCollection(repr: This): Traversable[A]

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

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

     Attributes
       protected[this]
     Definition Classes
       TraversableLike

111. #### def toIndexedSeq: IndexedSeq[A]

     Converts this collection to an indexed sequence.

     Converts this collection to an indexed sequence.

     Note: will not terminate for infinite-sized collections.

     returns

       an indexed sequence containing all elements of this collection.

     Definition Classes
       TraversableOnce → GenTraversableOnce

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

     Converts this collection to an iterable collection.

     Converts this collection 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).

     Note: will not terminate for infinite-sized collections.

     returns

       an `Iterable` containing all elements of this collection.

     Definition Classes
       TraversableOnce → GenTraversableOnce

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

     Returns an Iterator over the elements in this collection.

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

     Note: will not terminate for infinite-sized collections.

     returns

       an Iterator containing all elements of this collection.

     Definition Classes
       TraversableLike → GenTraversableOnce

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

     Converts this collection to a list.

     Converts this collection to a list.

     Note: will not terminate for infinite-sized collections.

     returns

       a list containing all elements of this collection.

     Definition Classes
       TraversableOnce → GenTraversableOnce

115. #### def toMap[T, U]: Map[T, U]

     [use case]

     [use case]
     returns

       a map of type `immutable.Map[T, U]` containing all key/value pairs of type `(T, U)` of this collection.

     Definition Classes
       TraversableOnce → GenTraversableOnce

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

     Converts this collection to a sequence.

     Converts this collection to a sequence. As with `toIterable`, it's lazy in this default implementation, as this `TraversableOnce` may be lazy and unevaluated.

     Note: will not terminate for infinite-sized collections.

     returns

       a sequence containing all elements of this collection.

     Definition Classes
       TraversableOnce → GenTraversableOnce

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

     Converts this collection to a set.

     Converts this collection to a set.

     Note: will not terminate for infinite-sized collections.

     returns

       a set containing all elements of this collection.

     Definition Classes
       TraversableOnce → GenTraversableOnce

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

     Converts this collection to a stream.

     Converts this collection to a stream.

     Note: will not terminate for infinite-sized collections.

     returns

       a stream containing all elements of this collection.

     Definition Classes
       TraversableLike → GenTraversableOnce

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

     Converts this collection to a string.

     Converts this collection to a string.

     returns

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

     Definition Classes
       TraversableViewLike → TraversableLike → AnyRef → Any

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

     Converts this collection to an unspecified Traversable.

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

     Note: will not terminate for infinite-sized collections.

     returns

       a Traversable containing all elements of this collection.

     Definition Classes
       TraversableLike → TraversableOnce → GenTraversableOnce

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

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

     Converts this collection 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 collection is a pair.

     returns

       a pair collections, containing the first, respectively second half of each element pair of this collection.

     Definition Classes
       TraversableViewLike → GenericTraversableTemplate

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

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

     Converts this collection 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 collection is a triple.

     returns

       a triple collections, containing the first, second, respectively third member of each element triple of this collection.

     Definition Classes
       TraversableViewLike → GenericTraversableTemplate

123. #### def view(from: Int, until: Int): TraversableView[A, This]

     Creates a non-strict view of a slice of this collection.

     Creates a non-strict view of a slice of this collection.

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

     Note: `view(from, to)` is equivalent to `view.slice(from, to)`

     Note: might return different results for different runs, unless the underlying collection type is ordered.

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

     Definition Classes
       TraversableLike

124. #### def view: TraversableView[A, This]

     Creates a non-strict view of this collection.

     Creates a non-strict view of this collection.

     returns

       a non-strict view of this collection.

     Definition Classes
       TraversableLike

125. #### def viewIdString: String

     Attributes
       protected[this]
     Definition Classes
       TraversableViewLike → GenTraversableViewLike

126. #### def viewIdentifier: String

     Attributes
       protected[this]
     Definition Classes
       TraversableViewLike → GenTraversableViewLike

127. #### def viewToString: String

     Definition Classes
       GenTraversableViewLike

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

     Definition Classes
       AnyRef
     Annotations
       @throws()

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

     Definition Classes
       AnyRef
     Annotations
       @throws()

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

     Definition Classes
       AnyRef
     Annotations
       @throws()

131. #### def withFilter(p: (A) ⇒ Boolean): This

     Creates a non-strict filter of this collection.

     Creates a non-strict filter of this collection.

     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.

     Note: might return different results for different runs, unless the underlying collection type is ordered.

     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 collection which satisfy the predicate `p`.

     Definition Classes
       TraversableViewLike → TraversableLike → FilterMonadic

### Inherited from GenTraversableViewLike[A, Coll, This]

### Inherited from ViewMkString[A]

### Inherited from Traversable[A]

### Inherited from GenTraversable[A]

### Inherited from GenericTraversableTemplate[A, Traversable]

### Inherited from TraversableLike[A, This]

### Inherited from GenTraversableLike[A, This]

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

### Inherited from TraversableOnce[A]

### Inherited from GenTraversableOnce[A]

### Inherited from FilterMonadic[A, This]

### Inherited from HasNewBuilder[A, This]

### Inherited from AnyRef

### Inherited from Any