scala.collection.immutable.Stream

Cons

class Cons [+A] extends Stream[A] with Serializable

A lazy cons cell, from which streams are built.

Attributes
final
Annotations
@SerialVersionUID( uid = 602202424901551803L )
Source
Stream.scala
Linear Supertypes
Serializable, Serializable, Stream[A], LinearSeqOptimized[A, Stream[A]], LinearSeq[A], LinearSeq[A], LinearSeqLike[A, Stream[A]], Seq[A], Seq[A], SeqLike[A, Stream[A]], GenSeq[A], GenSeqLike[A, Stream[A]], PartialFunction[Int, A], (Int) ⇒ A, Iterable[A], Iterable[A], IterableLike[A, Stream[A]], Equals, GenIterable[A], GenIterableLike[A, Stream[A]], Traversable[A], Immutable, Traversable[A], GenTraversable[A], GenericTraversableTemplate[A, Stream], TraversableLike[A, Stream[A]], GenTraversableLike[A, Stream[A]], Parallelizable[A, ParSeq[A]], TraversableOnce[A], GenTraversableOnce[A], FilterMonadic[A, Stream[A]], HasNewBuilder[A, Stream[A]], AnyRef, Any
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  1. Cons
  2. Serializable
  3. Serializable
  4. Stream
  5. LinearSeqOptimized
  6. LinearSeq
  7. LinearSeq
  8. LinearSeqLike
  9. Seq
  10. Seq
  11. SeqLike
  12. GenSeq
  13. GenSeqLike
  14. PartialFunction
  15. Function1
  16. Iterable
  17. Iterable
  18. IterableLike
  19. Equals
  20. GenIterable
  21. GenIterableLike
  22. Traversable
  23. Immutable
  24. Traversable
  25. GenTraversable
  26. GenericTraversableTemplate
  27. TraversableLike
  28. GenTraversableLike
  29. Parallelizable
  30. TraversableOnce
  31. GenTraversableOnce
  32. FilterMonadic
  33. HasNewBuilder
  34. AnyRef
  35. Any
Visibility
  1. Public
  2. All

Instance Constructors

  1. new Cons (hd: A, tl: ⇒ Stream[A])

Type Members

  1. type Self = Stream[A]

    The type implementing this traversable

    The type implementing this traversable

    Attributes
    protected
    Definition Classes
    TraversableLike
  2. class StreamWithFilter extends WithFilter

    A lazier implementation of WithFilter than TraversableLike's.

  3. class WithFilter extends FilterMonadic[A, Repr]

    A class supporting filtered operations.

Value Members

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

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

    Test two objects for inequality.

    Test two objects for inequality.

    returns

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

    Attributes
    final
    Definition Classes
    Any
  3. 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 ==

    Attributes
    final
    Definition Classes
    AnyRef → Any
  4. def ++ [B >: A, That] (that: GenTraversableOnce[B])(implicit bf: CanBuildFrom[Stream[A], B, That]): That

    Create a new stream which contains all elements of this stream followed by all elements of Traversable that.

    Create a new stream which contains all elements of this stream followed by all elements of Traversable that.

    B

    the element type of the returned collection.

    That

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

    that

    the traversable to append.

    bf

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

    returns

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

    Definition Classes
    StreamTraversableLike → GenTraversableLike
  5. def ++ [B >: A, That] (that: TraversableOnce[B])(implicit bf: CanBuildFrom[Stream[A], B, That]): That

    Definition Classes
    TraversableLike
    Annotations
    @bridge()
  6. def ++: [B >: A, That] (that: Traversable[B])(implicit bf: CanBuildFrom[Stream[A], B, That]): That

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

    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.

    Definition Classes
    TraversableLike
  7. def ++: [B] (that: TraversableOnce[B]): Stream[B]

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

    [use case]

    Concatenates this stream 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 stream followed by all elements of that.

    Attributes
    abstract
    Definition Classes
    TraversableLike
  8. def ++: [B >: A, That] (that: TraversableOnce[B])(implicit bf: CanBuildFrom[Stream[A], B, That]): That

    Concatenates this stream with the elements of a traversable collection.

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

    that

    the traversable to append.

    bf

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

    returns

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

    Definition Classes
    TraversableLike
  9. def +: (elem: A): Stream[A]

    [use case] Prepends an element to this stream

    [use case]

    Prepends an element to this stream

    elem

    the prepended element

    returns

    a new collection of type That consisting of elem followed by all elements of this stream.

    Attributes
    abstract
    Definition Classes
    GenSeqLike
  10. def +: [B >: A, That] (elem: B)(implicit bf: CanBuildFrom[Stream[A], B, That]): That

    Prepends an element to this stream

    Prepends an element to this stream

    B

    the element type of the returned stream.

    That

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

    elem

    the prepended element

    bf

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

    returns

    a new collection of type That consisting of elem followed by all elements of this stream.

    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 stream, going left to right.

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

    Note: /: is alternate syntax for foldLeft; z /: xs is the same as xs foldLeft z.

    Note: will not terminate for infinite-sized collections.

    B

    the result type of the binary operator.

    z

    the start value.

    op

    the binary operator.

    returns

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

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

    where x,,1,,, ..., x,,n,, are the elements of this stream.

    Definition Classes
    TraversableOnceGenTraversableOnce
  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.

    Definition Classes
    GenTraversableOnce
  13. def :+ (elem: A): Stream[A]

    [use case] Appends an element to this stream

    [use case]

    Appends an element to this stream

    Note: will not terminate for infinite-sized collections.

    elem

    the appended element

    returns

    a new collection of type That consisting of all elements of this stream followed by elem.

    Attributes
    abstract
    Definition Classes
    GenSeqLike
  14. def :+ [B >: A, That] (elem: B)(implicit bf: CanBuildFrom[Stream[A], B, That]): That

    Appends an element to this stream

    Appends an element to this stream

    Note: will not terminate for infinite-sized collections.

    B

    the element type of the returned stream.

    That

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

    elem

    the appended element

    bf

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

    returns

    a new collection of type That consisting of all elements of this stream 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 stream and a start value, going right to left.

    Applies a binary operator to all elements of this stream 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.

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

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

    where x,,1,,, ..., x,,n,, are the elements of this stream.

    Definition Classes
    TraversableOnceGenTraversableOnce
  16. def == (arg0: AnyRef): Boolean

    Attributes
    final
    Definition Classes
    AnyRef
  17. 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.

    Attributes
    final
    Definition Classes
    Any
  18. def addString (b: StringBuilder, start: String, sep: String, end: String): StringBuilder

    Write all defined elements of this iterable into given string builder.

    Write all defined elements of this iterable into given string builder. The written text begins with the string start and is finished by the string end. Inside, the string representations of defined elements (w.r.t. the method toString()) are separated by the string sep. The method will not force evaluation of undefined elements. A tail of such elements will be represented by a "?" instead.

    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
    StreamTraversableOnce
  19. def addString (b: StringBuilder): StringBuilder

    Appends all elements of this stream to a string builder.

    Appends all elements of this stream to a string builder. The written text consists of the string representations (w.r.t. the method toString) of all elements of this stream without any separator string.

    b

    the string builder to which elements are appended.

    returns

    the string builder b to which elements were appended.

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

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

    Appends all elements of this stream 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 stream, separated by the string sep.

    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
  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 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).

    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
    TraversableOnceGenTraversableOnce
  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
    PartialFunctionFunction1
  23. def append [B >: A] (rest: ⇒ TraversableOnce[B]): Stream[B]

    The stream resulting from the concatenation of this stream with the argument stream.

    The stream resulting from the concatenation of this stream with the argument stream.

    rest

    The stream that gets appended to this stream

    returns

    The stream containing elements of this stream and the traversable object.

    Definition Classes
    Stream
  24. def apply (n: Int): A

    Selects an element by its index in the stream.

    Selects an element by its index in the stream. Note: the execution of apply may take time proportial to the index value.

    returns

    the element of this stream at index idx, where 0 indicates the first element.

    Definition Classes
    LinearSeqOptimizedSeqLike → GenSeqLike
  25. 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.

    Attributes
    final
    Definition Classes
    Any
  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 stream should be compared

    returns

    true, if this stream can possibly equal that, false otherwise. The test takes into consideration only the run-time types of objects but ignores their elements.

    Definition Classes
    IterableLikeEquals
  27. 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()
  28. def collect [B] (pf: PartialFunction[A, B]): Stream[B]

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

    [use case]

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

    B

    the element type of the returned collection.

    pf

    the partial function which filters and maps the stream.

    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.

    Attributes
    abstract
    Definition Classes
    GenTraversableLike
  29. def collect [B, That] (pf: PartialFunction[A, B])(implicit bf: CanBuildFrom[Stream[A], B, That]): That

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

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

    B

    the element type of the returned collection.

    That

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

    pf

    the partial function which filters and maps the stream.

    bf

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

    returns

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

    Attributes
    final
    Definition Classes
    StreamTraversableLike → GenTraversableLike
  30. def collectFirst [B] (pf: PartialFunction[A, B]): Option[B]

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

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

    Note: may not terminate for infinite-sized collections.

    pf

    the partial function

    returns

    an option value containing pf applied to the first value for which it is defined, or None if none exists.

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

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

    Iterates over combinations.

    Iterates over combinations.

    returns

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

    Definition Classes
    SeqLike
    Example:
    1. "abbbc".combinations(2) = Iterator(ab, ac, bb, bc)

  32. def companion : GenericCompanion[Stream]

    The factory companion object that builds instances of class Stream.

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

    Definition Classes
    StreamLinearSeqLinearSeqSeqSeqGenSeqIterableIterableGenIterableTraversableTraversableGenTraversableGenericTraversableTemplate
  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 stream contains a given value as an element.

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

    Note: may not terminate for infinite-sized collections.

    elem

    the element to test.

    returns

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

    Definition Classes
    SeqLike
  35. def containsSlice [B] (that: Seq[B]): Boolean

    Definition Classes
    SeqLike
    Annotations
    @bridge()
  36. def containsSlice [B] (that: GenSeq[B]): Boolean

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

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

    Note: may not terminate for infinite-sized collections.

    that

    the sequence to test

    returns

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

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

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

    [use case]

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

    Attributes
    abstract
    Definition Classes
    TraversableLike
  38. def copyToArray [B >: A] (xs: Array[B], start: Int, len: Int): Unit

    Copies elements of this stream to an array.

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

    Note: will not terminate for infinite-sized collections.

    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
    IterableLikeTraversableLikeTraversableOnceGenTraversableOnce
  39. def copyToArray (xs: Array[A]): Unit

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

    [use case]

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

    xs

    the array to fill.

    Attributes
    abstract
    Definition Classes
    GenTraversableOnce
  40. def copyToArray [B >: A] (xs: Array[B]): Unit

    Copies values of this stream to an array.

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

    Note: will not terminate for infinite-sized collections.

    B

    the type of the elements of the array.

    xs

    the array to fill.

    Definition Classes
    TraversableOnceGenTraversableOnce
  41. def copyToArray (xs: Array[A], start: Int): Unit

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

    [use case]

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

    xs

    the array to fill.

    start

    the starting index.

    Attributes
    abstract
    Definition Classes
    GenTraversableOnce
  42. def copyToArray [B >: A] (xs: Array[B], start: Int): Unit

    Copies values of this stream to an array.

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

    Note: will not terminate for infinite-sized collections.

    B

    the type of the elements of the array.

    xs

    the array to fill.

    start

    the starting index.

    Definition Classes
    TraversableOnceGenTraversableOnce
  43. def copyToBuffer [B >: A] (dest: Buffer[B]): Unit

    Copies all elements of this stream to a buffer.

    Copies all elements of this stream to a buffer.

    Note: will not terminate for infinite-sized collections.

    dest

    The buffer to which elements are copied.

    Definition Classes
    TraversableOnce
  44. def corresponds [B] (that: Seq[B])(p: (A, B) ⇒ Boolean): Boolean

    Definition Classes
    SeqLike
    Annotations
    @bridge()
  45. def corresponds [B] (that: GenSeq[B])(p: (A, B) ⇒ Boolean): Boolean

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

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

    Definition Classes
    SeqLike → GenSeqLike
  46. def count (p: (A) ⇒ Boolean): Int

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

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

    p

    the predicate used to test elements.

    returns

    the number of elements satisfying the predicate p.

    Definition Classes
    LinearSeqOptimizedTraversableOnceGenTraversableOnce
  47. def diff [B >: A] (that: Seq[B]): Stream[A]

    Definition Classes
    SeqLike
    Annotations
    @bridge()
  48. def diff (that: Seq[A]): Stream[A]

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

    [use case]

    Computes the multiset difference between this stream and another sequence.

    Note: will not terminate for infinite-sized collections.

    that

    the sequence of elements to remove

    returns

    a new collection of type That which contains all elements of this stream 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.

    Attributes
    abstract
    Definition Classes
    SeqLike
  49. def diff [B >: A] (that: GenSeq[B]): Stream[A]

    Computes the multiset difference between this stream and another sequence.

    Computes the multiset difference between this stream and another sequence.

    Note: will not terminate for infinite-sized collections.

    B

    the element type of the returned stream.

    that

    the sequence of elements to remove

    returns

    a new collection of type That which contains all elements of this stream 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
  50. def distinct : Stream[A]

    Builds a new stream from this stream in which any duplicates (wrt to ==) removed.

    Builds a new stream from this stream in which any duplicates (wrt to ==) removed. Among duplicate elements, only the first one is retained in the result stream

    returns

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

    Definition Classes
    StreamSeqLike → GenSeqLike
  51. def drop (n: Int): Stream[A]

    Selects all elements except first n ones.

    Selects all elements except first n ones.

    n

    the number of elements to drop from this stream.

    returns

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

    Attributes
    final
    Definition Classes
    StreamLinearSeqOptimizedIterableLikeTraversableLike → GenTraversableLike
    Annotations
    @tailrec()
  52. def dropRight (n: Int): Stream[A]

    Selects all elements except last n ones.

    Selects all elements except last n ones.

    n

    The number of elements to take

    returns

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

    Definition Classes
    LinearSeqOptimizedIterableLike
  53. def dropWhile (p: (A) ⇒ Boolean): Stream[A]

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

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

    p

    the test predicate.

    returns

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

    Definition Classes
    StreamTraversableLike → GenTraversableLike
  54. def endsWith [B] (that: Seq[B]): Boolean

    Definition Classes
    SeqLike
    Annotations
    @bridge()
  55. def endsWith [B] (that: GenSeq[B]): Boolean

    Tests whether this stream ends with the given sequence.

    Tests whether this stream ends with the given sequence.

    Note: will not terminate for infinite-sized collections.

    that

    the sequence to test

    returns

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

    Definition Classes
    SeqLike → GenSeqLike
  56. 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.

    Attributes
    final
    Definition Classes
    AnyRef
  57. 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
  58. def exists (p: (A) ⇒ Boolean): Boolean

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

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

    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 stream, otherwise false.

    Definition Classes
    LinearSeqOptimizedIterableLikeTraversableLikeTraversableOnceGenTraversableOnce
  59. def filter (p: (A) ⇒ Boolean): Stream[A]

    Returns all the elements of this stream that satisfy the predicate p.

    Returns all the elements of this stream that satisfy the predicate p. The order of the elements is preserved.

    p

    the predicate used to filter the stream.

    returns

    the elements of this stream satisfying p.

    Definition Classes
    StreamTraversableLike → GenTraversableLike
  60. def filterNot (p: (A) ⇒ Boolean): Stream[A]

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

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

    p

    the predicate used to test elements.

    returns

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

    Definition Classes
    TraversableLike → GenTraversableLike
  61. 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()
  62. def find (p: (A) ⇒ Boolean): Option[A]

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

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

    Note: may not terminate for infinite-sized collections.

    p

    the predicate used to test elements.

    returns

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

    Definition Classes
    LinearSeqOptimizedIterableLikeTraversableLikeTraversableOnceGenTraversableOnce
  63. def flatMap [B, That] (f: (A) ⇒ GenTraversableOnce[B])(implicit bf: CanBuildFrom[Stream[A], B, That]): That

    Applies the given function f to each element of this stream, then concatenates the results.

    Applies the given function f to each element of this stream, then concatenates the results.

    B

    the element type of the returned collection.

    That

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

    f

    the function to apply on each element.

    bf

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

    returns

    f(a0) ::: ... ::: f(an) if this stream is [a0, ..., an].

    Attributes
    final
    Definition Classes
    StreamTraversableLike → GenTraversableLike → FilterMonadic
  64. def flatten [B] : Stream[B]

    [use case] Converts this stream of traversable collections into a stream in which all element collections are concatenated.

    [use case]

    Converts this stream of traversable collections into a stream in which all element collections are concatenated.

    B

    the type of the elements of each traversable collection.

    returns

    a new stream resulting from concatenating all element streams.

    Attributes
    abstract
    Definition Classes
    GenericTraversableTemplate
  65. def flatten [B] (implicit asTraversable: (A) ⇒ TraversableOnce[B]): Stream[B]

    Converts this stream of traversable collections into a stream in which all element collections are concatenated.

    Converts this stream of traversable collections into a stream in which all element collections are concatenated.

    B

    the type of the elements of each traversable collection.

    asTraversable

    an implicit conversion which asserts that the element type of this stream is a Traversable.

    returns

    a new stream resulting from concatenating all element streams.

    Definition Classes
    StreamTraversableGenericTraversableTemplate
  66. def fold [A1 >: A] (z: A1)(op: (A1, A1) ⇒ A1): A1

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

    Folds the elements of this sequence using the specified associative binary operator. The order in which the elements are reduced is unspecified and may be nondeterministic.

    Note this method has a different signature than the foldLeft and foldRight methods of the trait Traversable. The result of folding may only be a supertype of this parallel collection's type parameter T.

    z

    a neutral element for the fold operation, it may be added to the result an arbitrary number of times, not changing 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
    TraversableOnceGenTraversableOnce
  67. def foldLeft [B] (z: B)(op: (B, A) ⇒ B): B

    Stream specialization of foldLeft which allows GC to collect along the way.

    Stream specialization of foldLeft which allows GC to collect along the way.

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

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

    where x,,1,,, ..., x,,n,, are the elements of this stream.

    Attributes
    final
    Definition Classes
    StreamLinearSeqOptimizedTraversableOnceGenTraversableOnce
    Annotations
    @tailrec()
  68. def foldRight [B] (z: B)(f: (A, B) ⇒ B): B

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

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

    Note: will not terminate for infinite-sized collections.

    B

    the result type of the binary operator.

    z

    the start value.

    returns

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

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

    where x,,1,,, ..., x,,n,, are the elements of this stream.

    Definition Classes
    LinearSeqOptimizedIterableLikeTraversableOnceGenTraversableOnce
  69. def forall (p: (A) ⇒ Boolean): Boolean

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

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

    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 stream, otherwise false.

    Definition Classes
    LinearSeqOptimizedIterableLikeTraversableLikeTraversableOnceGenTraversableOnce
  70. def force : Stream[A]

    Forces evaluation of the whole stream and returns it.

    Forces evaluation of the whole stream and returns it.

    Definition Classes
    Stream
  71. def foreach [B] (f: (A) ⇒ B): Unit

    Apply the given function f to each element of this linear sequence (while respecting the order of the elements).

    Apply the given function f to each element of this linear sequence (while respecting the order of the elements).

    f

    the treatment to apply to each element.

    Attributes
    final
    Definition Classes
    StreamLinearSeqOptimizedIterableLikeGenericTraversableTemplateTraversableLike → GenTraversableLike → TraversableOnceGenTraversableOnceFilterMonadic
    Annotations
    @tailrec()
  72. def genericBuilder [B] : Builder[B, Stream[B]]

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

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

    Definition Classes
    GenericTraversableTemplate
  73. def getClass (): java.lang.Class[_ <: java.lang.Object]

    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.

    Attributes
    final
    Definition Classes
    AnyRef
  74. def groupBy [K] (f: (A) ⇒ K): Map[K, Stream[A]]

    Partitions this stream into a map of streams according to some discriminator function.

    Partitions this stream into a map of streams 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 stream.

    K

    the type of keys returned by the discriminator function.

    f

    the discriminator function.

    returns

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

    Definition Classes
    TraversableLike → GenTraversableLike
  75. def grouped (size: Int): Iterator[Stream[A]]

    Partitions elements in fixed size streams.

    Partitions elements in fixed size streams.

    size

    the number of elements per group

    returns

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

    Definition Classes
    IterableLike
    See also

    Iterator#grouped

  76. def hasDefiniteSize : Boolean

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

    Tests whether this stream 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
    StreamTraversableLikeTraversableOnceGenTraversableOnce
  77. def hashCode (): Int

    Hashcodes for Stream produce a value from the hashcodes of all the elements of the stream.

    Hashcodes for Stream produce a value from the hashcodes of all the elements of the stream.

    returns

    the hash code value for this object.

    Definition Classes
    GenSeqLike → AnyRef → Any
  78. def head : A

    The first element of this stream

    The first element of this stream

    returns

    the first element of this stream.

    Definition Classes
    ConsStreamLinearSeqOptimizedIterableLike → GenIterableLike → GenericTraversableTemplateTraversableLike → GenTraversableLike
  79. def headOption : Option[A]

    Optionally selects the first element.

    Optionally selects the first element.

    returns

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

    Definition Classes
    TraversableLike
  80. def indexOf (elem: A, from: Int): Int

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

    [use case]

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

    Attributes
    abstract
    Definition Classes
    GenSeqLike
  81. def indexOf [B >: A] (elem: B, from: Int): Int

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

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

    Note: may not terminate for infinite-sized collections.

    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 stream that is equal (wrt ==) to elem, or -1, if none exists.

    Definition Classes
    GenSeqLike
  82. def indexOf (elem: A): Int

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

    [use case]

    Finds index of first occurrence of some value in this stream.

    elem

    the element value to search for.

    returns

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

    Attributes
    abstract
    Definition Classes
    GenSeqLike
  83. def indexOf [B >: A] (elem: B): Int

    Finds index of first occurrence of some value in this stream.

    Finds index of first occurrence of some value in this stream.

    Note: may not terminate for infinite-sized collections.

    B

    the type of the element elem.

    elem

    the element value to search for.

    returns

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

    Definition Classes
    GenSeqLike
  84. def indexOfSlice [B >: A] (that: Seq[B], from: Int): Int

    Definition Classes
    SeqLike
    Annotations
    @bridge()
  85. def indexOfSlice [B >: A] (that: GenSeq[B], from: Int): Int

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

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

    Note: may not terminate for infinite-sized collections.

    that

    the sequence to test

    from

    the start index

    returns

    the first index >= from such that the elements of this stream starting at this index match the elements of sequence that, or -1 of no such subsequence exists.

    Definition Classes
    SeqLike
  86. def indexOfSlice [B >: A] (that: Seq[B]): Int

    Definition Classes
    SeqLike
    Annotations
    @bridge()
  87. def indexOfSlice [B >: A] (that: GenSeq[B]): Int

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

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

    Note: may not terminate for infinite-sized collections.

    that

    the sequence to test

    returns

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

    Definition Classes
    SeqLike
  88. 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.

    Note: may not terminate for infinite-sized collections.

    p

    the predicate used to test elements.

    from

    the start index

    returns

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

    Definition Classes
    LinearSeqOptimizedSeqLike → GenSeqLike
  89. def indexWhere (p: (A) ⇒ Boolean): Int

    Finds index of first element satisfying some predicate.

    Finds index of first element satisfying some predicate.

    Note: may not terminate for infinite-sized collections.

    p

    the predicate used to test elements.

    returns

    the index of the first element of this stream that satisfies the predicate p, or -1, if none exists.

    Definition Classes
    GenSeqLike
  90. 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 stream.

    Definition Classes
    SeqLike
  91. def init : Stream[A]

    The stream without its last element.

    The stream without its last element.

    returns

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

    Definition Classes
    StreamTraversableLike
  92. def inits : Iterator[Stream[A]]

    Iterates over the inits of this stream.

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

    returns

    an iterator over all the inits of this stream

    Definition Classes
    TraversableLike
    Example:
    1. List(1,2,3).inits = Iterator(List(1,2,3), List(1,2), List(1), Nil)

  93. def intersect [B >: A] (that: Seq[B]): Stream[A]

    Definition Classes
    SeqLike
    Annotations
    @bridge()
  94. def intersect (that: Seq[A]): Stream[A]

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

    [use case]

    Computes the multiset intersection between this stream and another sequence.

    Note: may not terminate for infinite-sized collections.

    that

    the sequence of elements to intersect with.

    returns

    a new collection of type That which contains all elements of this stream 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.

    Attributes
    abstract
    Definition Classes
    SeqLike
  95. def intersect [B >: A] (that: GenSeq[B]): Stream[A]

    Computes the multiset intersection between this stream and another sequence.

    Computes the multiset intersection between this stream and another sequence.

    Note: may not terminate for infinite-sized collections.

    B

    the element type of the returned stream.

    that

    the sequence of elements to intersect with.

    returns

    a new collection of type That which contains all elements of this stream 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
  96. def isDefinedAt (x: Int): Boolean

    Tests whether this stream contains given index.

    Tests whether this stream contains given index.

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

    returns

    true if this stream contains an element at position idx, false otherwise.

    Definition Classes
    LinearSeqOptimized → GenSeqLike
  97. def isEmpty : Boolean

    is this stream empty?

    is this stream empty?

    returns

    true if the stream contains no elements, false otherwise.

    Definition Classes
    ConsStreamLinearSeqOptimizedIterableLike → GenIterableLike → GenericTraversableTemplateTraversableLikeTraversableOnceGenTraversableOnce
  98. 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.

    Attributes
    final
    Definition Classes
    Any
  99. def isTraversableAgain : Boolean

    Tests whether this stream can be repeatedly traversed.

    Tests whether this stream can be repeatedly traversed.

    returns

    true

    Attributes
    final
    Definition Classes
    GenTraversableLike → GenTraversableOnce
  100. def iterator : Iterator[A]

    A lazier Iterator than LinearSeqLike's.

    A lazier Iterator than LinearSeqLike's.

    returns

    the new iterator

    Definition Classes
    StreamLinearSeqLikeIterableLike → GenIterableLike
  101. def last : A

    Selects the last element.

    Selects the last element.

    returns

    The last element of this stream.

    Definition Classes
    LinearSeqOptimizedTraversableLike
  102. def lastIndexOf (elem: A, end: Int): Int

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

    [use case]

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

    Attributes
    abstract
    Definition Classes
    GenSeqLike
  103. def lastIndexOf [B >: A] (elem: B, end: Int): Int

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

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

    Definition Classes
    GenSeqLike
  104. def lastIndexOf (elem: A): Int

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

    [use case]

    Finds index of last occurrence of some value in this stream.

    elem

    the element value to search for.

    returns

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

    Attributes
    abstract
    Definition Classes
    GenSeqLike
  105. def lastIndexOf [B >: A] (elem: B): Int

    Finds index of last occurrence of some value in this stream.

    Finds index of last occurrence of some value in this stream.

    Note: will not terminate for infinite-sized collections.

    B

    the type of the element elem.

    elem

    the element value to search for.

    returns

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

    Definition Classes
    GenSeqLike
  106. def lastIndexOfSlice [B >: A] (that: Seq[B], end: Int): Int

    Definition Classes
    SeqLike
    Annotations
    @bridge()
  107. def lastIndexOfSlice [B >: A] (that: GenSeq[B], end: Int): Int

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

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

    Definition Classes
    SeqLike
  108. def lastIndexOfSlice [B >: A] (that: Seq[B]): Int

    Definition Classes
    SeqLike
    Annotations
    @bridge()
  109. def lastIndexOfSlice [B >: A] (that: GenSeq[B]): Int

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

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

    Note: will not terminate for infinite-sized collections.

    that

    the sequence to test

    returns

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

    Definition Classes
    SeqLike
  110. 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 stream that satisfies the predicate p, or -1, if none exists.

    Definition Classes
    LinearSeqOptimizedSeqLike → GenSeqLike
  111. def lastIndexWhere (p: (A) ⇒ Boolean): Int

    Finds index of last element satisfying some predicate.

    Finds index of last element satisfying some predicate.

    Note: will not terminate for infinite-sized collections.

    p

    the predicate used to test elements.

    returns

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

    Definition Classes
    GenSeqLike
  112. def lastOption : Option[A]

    Optionally selects the last element.

    Optionally selects the last element.

    returns

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

    Definition Classes
    TraversableLike
  113. def length : Int

    The length of the stream.

    The length of the stream.

    Note: will not terminate for infinite-sized collections.

    Note: the execution of length may take time proportial to the length of the sequence.

    returns

    the number of elements in this stream.

    Definition Classes
    StreamLinearSeqOptimizedSeqLike → GenSeqLike
  114. def lengthCompare (len: Int): Int

    Compares the length of this stream to a test value.

    Compares the length of this stream 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
    LinearSeqOptimizedSeqLike
  115. 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

  116. def map [B, That] (f: (A) ⇒ B)(implicit bf: CanBuildFrom[Stream[A], B, That]): That

    Returns the stream resulting from applying the given function f to each element of this stream.

    Returns the stream resulting from applying the given function f to each element of this stream.

    B

    the element type of the returned collection.

    That

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

    f

    function to apply to each element.

    bf

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

    returns

    f(a0), ..., f(an) if this sequence is a0, ..., an.

    Attributes
    final
    Definition Classes
    StreamTraversableLike → GenTraversableLike → FilterMonadic
  117. def max : A

    [use case] Finds the largest element.

    [use case]

    Finds the largest element.

    returns

    the largest element of this stream with respect to the ordering cmp.

    Attributes
    abstract
    Definition Classes
    GenTraversableOnce
  118. 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 stream with respect to the ordering cmp.

    Definition Classes
    TraversableOnceGenTraversableOnce
  119. def maxBy [B] (f: (A) ⇒ B)(implicit cmp: Ordering[B]): A

    Definition Classes
    TraversableOnceGenTraversableOnce
  120. def min : A

    [use case] Finds the smallest element.

    [use case]

    Finds the smallest element.

    returns

    the smallest element of this stream with respect to the ordering cmp.

    Attributes
    abstract
    Definition Classes
    GenTraversableOnce
  121. 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 stream with respect to the ordering cmp.

    Definition Classes
    TraversableOnceGenTraversableOnce
  122. def minBy [B] (f: (A) ⇒ B)(implicit cmp: Ordering[B]): A

    Definition Classes
    TraversableOnceGenTraversableOnce
  123. def mkString (start: String, sep: String, end: String): String

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

    Displays all elements of this stream 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 stream. 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 stream are separated by the string sep.

    Definition Classes
    StreamTraversableOnceGenTraversableOnce
    Example:
    1. List(1, 2, 3).mkString("(", "; ", ")") = "(1; 2; 3)"

  124. def mkString : String

    Displays all elements of this stream in a string.

    Displays all elements of this stream in a string.

    returns

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

    Definition Classes
    StreamTraversableOnceGenTraversableOnce
  125. def mkString (sep: String): String

    Displays all elements of this stream in a string using a separator string.

    Displays all elements of this stream in a string using a separator string.

    sep

    the separator string.

    returns

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

    Definition Classes
    StreamTraversableOnceGenTraversableOnce
    Example:
    1. List(1, 2, 3).mkString("|") = "1|2|3"

  126. 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.

    Attributes
    final
    Definition Classes
    AnyRef
  127. def newBuilder : Builder[A, Stream[A]]

    The builder that builds instances of type Stream[A]

    The builder that builds instances of type Stream[A]

    Attributes
    protected[this]
    Definition Classes
    GenericTraversableTemplateHasNewBuilder
  128. def nonEmpty : Boolean

    Tests whether the stream is not empty.

    Tests whether the stream is not empty.

    returns

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

    Definition Classes
    TraversableOnceGenTraversableOnce
  129. 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.

    Attributes
    final
    Definition Classes
    AnyRef
  130. 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.

    Attributes
    final
    Definition Classes
    AnyRef
  131. 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
  132. def padTo [B >: A, That] (len: Int, elem: B)(implicit bf: CanBuildFrom[Stream[A], B, That]): That

    Returns a new sequence of given length containing the elements of this sequence followed by zero or more occurrences of given elements.

    Returns a new sequence of given length containing the elements of this sequence followed by zero or more occurrences of given elements.

    B

    the element type of the returned stream.

    That

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

    len

    the target length

    elem

    the padding value

    bf

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

    returns

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

    Definition Classes
    StreamSeqLike → GenSeqLike
  133. 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
  134. 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
    SeqSeqLikeIterableTraversableLikeParallelizable
  135. def partition (p: (A) ⇒ Boolean): (Stream[A], Stream[A])

    Returns all the elements of this stream that satisfy the predicate p.

    Returns all the elements of this stream that satisfy the predicate p. The order of the elements is preserved.

    p

    the predicate used to filter the stream.

    returns

    the elements of this stream satisfying p.

    Definition Classes
    StreamTraversableLike → GenTraversableLike
  136. def patch [B >: A, That] (from: Int, patch: Seq[B], replaced: Int)(implicit bf: CanBuildFrom[Stream[A], B, That]): That

    Definition Classes
    SeqLike
    Annotations
    @bridge()
  137. def patch (from: Int, that: GenSeq[A], replaced: Int): Stream[A]

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

    [use case]

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

    from

    the index of the first replaced element

    replaced

    the number of elements to drop in the original stream

    returns

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

    Attributes
    abstract
    Definition Classes
    GenSeqLike
  138. def patch [B >: A, That] (from: Int, patch: GenSeq[B], replaced: Int)(implicit bf: CanBuildFrom[Stream[A], B, That]): That

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

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

    B

    the element type of the returned stream.

    That

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

    from

    the index of the first replaced element

    patch

    the replacement sequence

    replaced

    the number of elements to drop in the original stream

    bf

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

    returns

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

    Definition Classes
    SeqLike → GenSeqLike
  139. def permutations : Iterator[Stream[A]]

    Iterates over distinct permutations.

    Iterates over distinct permutations.

    returns

    An Iterator which traverses the distinct permutations of this stream.

    Definition Classes
    SeqLike
    Example:
    1. "abb".permutations = Iterator(abb, bab, bba)

  140. 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.

    Note: may not terminate for infinite-sized collections.

    p

    the predicate used to test elements.

    returns

    the length of the longest prefix of this stream such that every element of the segment satisfies the predicate p.

    Definition Classes
    GenSeqLike
  141. def print (sep: String): Unit

    Prints elements of this stream one by one, separated by sep.

    Prints elements of this stream one by one, separated by sep.

    sep

    The separator string printed between consecutive elements.

    Definition Classes
    Stream
  142. def print (): Unit

    Prints elements of this stream one by one, separated by commas.

    Prints elements of this stream one by one, separated by commas.

    Definition Classes
    Stream
  143. 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 stream with respect to the * operator in num.

    Attributes
    abstract
    Definition Classes
    GenTraversableOnce
  144. 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 stream with respect to the * operator in num.

    Definition Classes
    TraversableOnceGenTraversableOnce
  145. def reduce [A1 >: A] (op: (A1, A1) ⇒ A1): A1

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

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

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

    Note this method has a different signature than the reduceLeft and reduceRight methods of the trait Traversable. The result of reducing may only be a supertype of this parallel collection's type parameter T.

    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
    TraversableOnceGenTraversableOnce
  146. def reduceLeft [B >: A] (f: (B, A) ⇒ B): B

    Stream specialization of reduceLeft which allows GC to collect along the way.

    Stream specialization of reduceLeft which allows GC to collect along the way.

    Attributes
    final
    Definition Classes
    StreamLinearSeqOptimizedTraversableOnce
  147. def reduceLeftOption [B >: A] (op: (B, A) ⇒ B): Option[B]

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

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

    Note: will not terminate for infinite-sized collections.

    B

    the result type of the binary operator.

    op

    the binary operator.

    returns

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

    Definition Classes
    TraversableOnceGenTraversableOnce
  148. def reduceOption [A1 >: A] (op: (A1, A1) ⇒ A1): Option[A1]

    Optionally reduces the elements of this sequence using the specified associative binary operator.

    Optionally reduces the elements of this sequence using the specified associative binary operator.

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

    Note this method has a different signature than the reduceLeftOption and reduceRightOption methods of the trait Traversable. The result of reducing may only be a supertype of this parallel collection's type parameter T.

    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
    TraversableOnceGenTraversableOnce
  149. def reduceRight [B >: A] (op: (A, B) ⇒ B): B

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

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

    Note: will not terminate for infinite-sized collections.

    B

    the result type of the binary operator.

    op

    the binary operator.

    returns

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

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

    where x,,1,,, ..., x,,n,, are the elements of this stream.

    Definition Classes
    LinearSeqOptimizedIterableLikeTraversableOnceGenTraversableOnce
  150. def reduceRightOption [B >: A] (op: (A, B) ⇒ B): Option[B]

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

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

    Note: will not terminate for infinite-sized collections.

    B

    the result type of the binary operator.

    op

    the binary operator.

    returns

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

    Definition Classes
    TraversableOnceGenTraversableOnce
  151. def repr : Stream[A]

    The collection of type stream underlying this TraversableLike object.

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

    Definition Classes
    TraversableLike → GenTraversableLike
  152. def reverse : Stream[A]

    A list consisting of all elements of this list in reverse order.

    A list consisting of all elements of this list in reverse order.

    returns

    A new stream with all elements of this stream in reversed order.

    Definition Classes
    StreamSeqLike → GenSeqLike
  153. def reverseIterator : Iterator[A]

    An iterator yielding elements in reversed order.

    An iterator yielding elements in reversed order.

    Note: will not terminate for infinite-sized collections.

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

    returns

    an iterator yielding the elements of this stream in reversed order

    Definition Classes
    SeqLike
  154. def reverseMap [B] (f: (A) ⇒ B): Stream[B]

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

    [use case]

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

    Note: xs.reverseMap(f) is the same as xs.reverse.map(f) but might be more efficient.

    Attributes
    abstract
    Definition Classes
    GenSeqLike
  155. def reverseMap [B, That] (f: (A) ⇒ B)(implicit bf: CanBuildFrom[Stream[A], B, That]): That

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

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

    Note: will not terminate for infinite-sized collections.

    Note: xs.reverseMap(f) is the same as xs.reverse.map(f) but might be more efficient.

    B

    the element type of the returned collection.

    That

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

    f

    the function to apply to each element.

    bf

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

    returns

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

    Definition Classes
    SeqLike → GenSeqLike
  156. def reversed : List[A]

    Attributes
    protected[this]
    Definition Classes
    TraversableOnce
  157. def sameElements (that: GenIterable[A]): Boolean

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

    [use case]

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

    that

    the collection to compare with.

    returns

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

    Attributes
    abstract
    Definition Classes
    GenIterableLike
  158. def sameElements [B >: A] (that: GenIterable[B]): Boolean

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

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

    Note: will not terminate for infinite-sized collections.

    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
    LinearSeqOptimizedIterableLike → GenIterableLike
  159. def sameElements [B >: A] (that: Iterable[B]): Boolean

    Definition Classes
    IterableLike
    Annotations
    @bridge()
  160. def scan [B >: A, That] (z: B)(op: (B, B) ⇒ B)(implicit cbf: CanBuildFrom[Stream[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 stream containing the prefix scan of the elements in this stream

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

    Create a new stream which contains all intermediate results of applying the operator to subsequent elements left to right.

    Create a new stream which contains all intermediate results of applying the operator to subsequent elements left to right.

    B

    the type of the elements in the resulting collection

    That

    the actual type of the resulting collection

    z

    the initial value

    op

    the binary operator applied to the intermediate result and the element

    bf

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

    returns

    collection with intermediate results

    Attributes
    final
    Definition Classes
    StreamTraversableLike → GenTraversableLike
  162. def scanRight [B, That] (z: B)(op: (A, B) ⇒ B)(implicit bf: CanBuildFrom[Stream[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.

    Note: will not terminate for infinite-sized collections.

    Example:

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

    the type of the elements in the resulting collection

    That

    the actual type of the resulting collection

    z

    the initial value

    op

    the binary operator applied to the intermediate result and the element

    bf

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

    returns

    collection with intermediate results

    Definition Classes
    TraversableLike → GenTraversableLike
    Annotations
    @migration
    Migration

    "This scanRight definition has changed in 2.9.\n" + "The previous behavior can be reproduced with scanRight.reverse."

  163. 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.

    Note: may not terminate for infinite-sized collections.

    p

    the predicate used to test elements.

    from

    the index where the search starts.

    returns

    the length of the longest segment of this stream starting from index from such that every element of the segment satisfies the predicate p.

    Definition Classes
    LinearSeqOptimizedSeqLike → GenSeqLike
  164. 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
    SeqSeqGenSeqIterableIterableGenIterableTraversableTraversableGenTraversableParallelizableTraversableOnceGenTraversableOnce
  165. def size : Int

    The size of this stream, equivalent to length.

    The size of this stream, equivalent to length.

    Note: will not terminate for infinite-sized collections.

    returns

    the number of elements in this stream.

    Definition Classes
    SeqLike → GenTraversableLike → TraversableOnceGenTraversableOnce
  166. def slice (from: Int, until: Int): Stream[A]

    A substream starting at index from and extending up to (but not including) index until.

    A substream starting at index from and extending up to (but not including) index until.

    from

    the lowest index to include from this stream.

    until

    the highest index to EXCLUDE from this stream.

    returns

    a stream containing the elements greater than or equal to index from extending up to (but not including) index until of this [email protected] start The index of the first element of the returned subsequence

    Definition Classes
    StreamLinearSeqOptimizedIterableLikeTraversableLike → GenTraversableLike
  167. def sliding [B >: A] (size: Int, step: Int): Iterator[Stream[A]]

    Definition Classes
    IterableLike
  168. def sliding [B >: A] (size: Int): Iterator[Stream[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 streams 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

  169. def sortBy [B] (f: (A) ⇒ B)(implicit ord: Ordering[B]): Stream[A]

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

    Sorts this Stream 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 stream consisting of the elements of this stream 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

    Note: will not terminate for infinite-sized collections.

  170. def sortWith (lt: (A, A) ⇒ Boolean): Stream[A]

    Sorts this stream according to a comparison function.

    Sorts this stream according to a comparison function.

    Note: will not terminate for infinite-sized collections.

    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 stream consisting of the elements of this stream 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")
      
  171. def sorted [B >: A] (implicit ord: Ordering[B]): Stream[A]

    Sorts this stream according to an Ordering.

    Sorts this stream 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 stream consisting of the elements of this stream sorted according to the ordering ord.

    Definition Classes
    SeqLike
    See also

    scala.math.Ordering

  172. def span (p: (A) ⇒ Boolean): (Stream[A], Stream[A])

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

    Splits this stream 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 stream whose elements all satisfy p, and the rest of this stream.

    Definition Classes
    LinearSeqOptimizedTraversableLike → GenTraversableLike
  173. def splitAt (n: Int): (Stream[A], Stream[A])

    Splits this stream into two at a given position.

    Splits this stream 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 streams consisting of the first n elements of this stream, and the other elements.

    Definition Classes
    StreamTraversableLike → GenTraversableLike
  174. def startsWith [B] (that: Seq[B], offset: Int): Boolean

    Definition Classes
    SeqLike
    Annotations
    @bridge()
  175. def startsWith [B] (that: GenSeq[B], offset: Int): Boolean

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

    Tests whether this stream 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 stream at index offset, otherwise false.

    Definition Classes
    SeqLike → GenSeqLike
  176. def startsWith [B] (that: Seq[B]): Boolean

    Definition Classes
    GenSeqLike
    Annotations
    @bridge()
  177. def startsWith [B] (that: GenSeq[B]): Boolean

    Tests whether this stream starts with the given sequence.

    Tests whether this stream 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
  178. def stringPrefix : String

    Defines the prefix of this object's toString representation as Stream.

    Defines the prefix of this object's toString representation as Stream.

    returns

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

    Definition Classes
    StreamTraversableLike → GenTraversableLike
  179. 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 stream with respect to the + operator in num.

    Attributes
    abstract
    Definition Classes
    GenTraversableOnce
  180. 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 stream with respect to the + operator in num.

    Definition Classes
    TraversableOnceGenTraversableOnce
  181. def synchronized [T0] (arg0: ⇒ T0): T0

    Attributes
    final
    Definition Classes
    AnyRef
  182. def tail : Stream[A]

    A stream consisting of the remaining elements of this stream after the first one.

    A stream consisting of the remaining elements of this stream after the first one.

    returns

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

    Definition Classes
    ConsStreamLinearSeqOptimizedTraversableLike → GenTraversableLike
  183. def tailDefined : Boolean

    Is the tail of this stream defined?

    Is the tail of this stream defined?

    Definition Classes
    ConsStream
  184. def tails : Iterator[Stream[A]]

    Iterates over the tails of this stream.

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

    returns

    an iterator over all the tails of this stream

    Definition Classes
    TraversableLike
    Example:
    1. List(1,2,3).tails = Iterator(List(1,2,3), List(2,3), List(3), Nil)

  185. def take (n: Int): Stream[A]

    Returns the n first elements of this stream, or else the whole stream, if it has less than n elements.

    Returns the n first elements of this stream, or else the whole stream, if it has less than n elements.

    n

    the number of elements to take.

    returns

    the n first elements of this stream.

    Definition Classes
    StreamLinearSeqOptimizedIterableLikeTraversableLike → GenTraversableLike
  186. def takeRight (n: Int): Stream[A]

    Returns the rightmost n elements from this iterable.

    Returns the rightmost n elements from this iterable.

    n

    the number of elements to take

    returns

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

    Definition Classes
    StreamIterableLike
  187. def takeWhile (p: (A) ⇒ Boolean): Stream[A]

    Returns the longest prefix of this stream whose elements satisfy the predicate p.

    Returns the longest prefix of this stream whose elements satisfy the predicate p.

    p

    the test predicate.

    returns

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

    Definition Classes
    StreamLinearSeqOptimizedIterableLikeTraversableLike → GenTraversableLike
  188. def thisCollection : LinearSeq[A]

    The underlying collection seen as an instance of Stream.

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

    Attributes
    protected[this]
    Definition Classes
    LinearSeqLikeSeqLikeIterableLikeTraversableLike
  189. def toArray : Array[A]

    [use case] Converts this stream to an array.

    [use case]

    Converts this stream to an array.

    Note: will not terminate for infinite-sized collections.

    returns

    an array containing all elements of this stream.

    Attributes
    abstract
    Definition Classes
    GenTraversableOnce
  190. def toArray [B >: A] (implicit arg0: ClassManifest[B]): Array[B]

    Converts this stream to an array.

    Converts this stream to an array.

    Note: will not terminate for infinite-sized collections.

    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 stream.

    Definition Classes
    TraversableOnceGenTraversableOnce
  191. def toBuffer [B >: A] : Buffer[B]

    Converts this stream to a mutable buffer.

    Converts this stream to a mutable buffer.

    Note: will not terminate for infinite-sized collections.

    returns

    a buffer containing all elements of this stream.

    Definition Classes
    TraversableOnceGenTraversableOnce
  192. def toCollection (repr: Stream[A]): LinearSeq[A]

    A conversion from collections of type Repr to Stream objects.

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

    Attributes
    protected[this]
    Definition Classes
    LinearSeqLikeSeqLikeIterableLikeTraversableLike
  193. def toIndexedSeq [B >: A] : IndexedSeq[B]

    Converts this stream to an indexed sequence.

    Converts this stream to an indexed sequence.

    Note: will not terminate for infinite-sized collections.

    returns

    an indexed sequence containing all elements of this stream.

    Definition Classes
    TraversableOnceGenTraversableOnce
  194. def toIterable : Iterable[A]

    Converts this stream to an iterable collection.

    Converts this stream 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 stream.

    Definition Classes
    IterableLikeTraversableOnceGenTraversableOnce
  195. def toIterator : Iterator[A]

    Returns an Iterator over the elements in this stream.

    Returns an Iterator over the elements in this stream. 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 stream.

    Definition Classes
    TraversableLikeGenTraversableOnce
  196. def toList : List[A]

    Converts this stream to a list.

    Converts this stream to a list.

    Note: will not terminate for infinite-sized collections.

    returns

    a list containing all elements of this stream.

    Definition Classes
    TraversableOnceGenTraversableOnce
  197. def toMap [T, U] : Map[T, U]

    [use case] Converts this stream to a map.

    [use case]

    Converts this stream 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.

    Note: will not terminate for infinite-sized collections.

    returns

    a map containing all elements of this stream.

    Attributes
    abstract
    Definition Classes
    GenTraversableOnce
  198. def toMap [T, U] (implicit ev: <:<[A, (T, U)]): Map[T, U]

    Converts this stream to a map.

    Converts this stream 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.

    Note: will not terminate for infinite-sized collections.

    returns

    a map containing all elements of this stream.

    Definition Classes
    TraversableOnceGenTraversableOnce
  199. def toSeq : Seq[A]

    Converts this stream to a sequence.

    Converts this stream to a sequence.

    Note: will not terminate for infinite-sized collections.

    Overridden for efficiency.

    returns

    a sequence containing all elements of this stream.

    Definition Classes
    SeqSeqLike → GenSeqLike → TraversableOnceGenTraversableOnce
  200. def toSet [B >: A] : Set[B]

    Converts this stream to a set.

    Converts this stream to a set.

    Note: will not terminate for infinite-sized collections.

    returns

    a set containing all elements of this stream.

    Definition Classes
    TraversableOnceGenTraversableOnce
  201. def toStream : Stream[A]

    Converts this stream to a stream.

    Converts this stream to a stream.

    Note: will not terminate for infinite-sized collections.

    returns

    a stream containing all elements of this stream.

    Definition Classes
    StreamIterableLikeTraversableLikeGenTraversableOnce
  202. def toString (): String

    Converts this stream to a string.

    Converts this stream to a string.

    returns

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

    Definition Classes
    StreamSeqLikeFunction1TraversableLike → AnyRef → Any
  203. def toTraversable : Traversable[A]

    Converts this stream to an unspecified Traversable.

    Converts this stream 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 stream.

    Definition Classes
    TraversableLikeTraversableOnceGenTraversableOnce
  204. def transpose [B] (implicit asTraversable: (A) ⇒ TraversableOnce[B]): Traversable[Traversable[B]]

    Transposes this stream of traversable collections into a stream of streams.

    Transposes this stream of traversable collections into a stream of streams.

    B

    the type of the elements of each traversable collection.

    asTraversable

    an implicit conversion which asserts that the element type of this stream is a Traversable.

    returns

    a two-dimensional stream of streams which has as nth row the nth column of this stream.

    Definition Classes
    TraversableGenericTraversableTemplate
    Annotations
    @bridge()
  205. def union (that: Seq[A]): Stream[A]

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

    [use case]

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

    Note: will not terminate for infinite-sized collections.

    that

    the sequence to add.

    returns

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

    Attributes
    abstract
    Definition Classes
    SeqLike
  206. def union [B >: A, That] (that: GenSeq[B])(implicit bf: CanBuildFrom[Stream[A], B, That]): That

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

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

    Note: will not terminate for infinite-sized collections.

    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.

    Note: will not terminate for infinite-sized collections.

    B

    the element type of the returned stream.

    That

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

    that

    the sequence to add.

    bf

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

    returns

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

    Definition Classes
    SeqLike → GenSeqLike
  207. def union [B >: A, That] (that: Seq[B])(implicit bf: CanBuildFrom[Stream[A], B, That]): That

    Definition Classes
    GenSeqLike
    Annotations
    @bridge()
  208. def unzip [A1, A2] (implicit asPair: (A) ⇒ (A1, A2)): (Stream[A1], Stream[A2])

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

    Converts this stream 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 stream is a pair.

    returns

    a pair streams, containing the first, respectively second half of each element pair of this stream.

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

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

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

    returns

    a triple streams, containing the first, second, respectively third member of each element triple of this stream.

    Definition Classes
    GenericTraversableTemplate
  210. def updated (index: Int, elem: A): Stream[A]

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

    [use case]

    A copy of this stream with one single replaced element.

    index

    the position of the replacement

    elem

    the replacing element

    returns

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

    Attributes
    abstract
    Definition Classes
    GenSeqLike
  211. def updated [B >: A, That] (index: Int, elem: B)(implicit bf: CanBuildFrom[Stream[A], B, That]): That

    A copy of this stream with one single replaced element.

    A copy of this stream with one single replaced element.

    B

    the element type of the returned stream.

    That

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

    index

    the position of the replacement

    elem

    the replacing element

    bf

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

    returns

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

    Definition Classes
    SeqLike → GenSeqLike
  212. def view : StreamView[A, Stream[A]]

    Creates a non-strict view of this stream.

    Creates a non-strict view of this stream.

    returns

    a non-strict view of this stream.

    Definition Classes
    StreamSeqLikeIterableLikeTraversableLike
  213. def view (from: Int, until: Int): SeqView[A, Stream[A]]

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

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

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

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

    Definition Classes
    SeqLikeIterableLikeTraversableLike
  214. def wait (): Unit

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

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

    Attributes
    final
    Definition Classes
    AnyRef
    Annotations
    @throws()
  217. def withFilter (p: (A) ⇒ Boolean): StreamWithFilter

    Creates a non-strict filter of this stream.

    Creates a non-strict filter of this stream.

    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 stream which satisfy the predicate p.

    Attributes
    final
    Definition Classes
    StreamTraversableLikeFilterMonadic
  218. def zip [A1 >: A, B, That] (that: GenIterable[B])(implicit bf: CanBuildFrom[Stream[A], (A1, B), That]): That

    Returns a stream formed from this stream and the specified stream that by associating each element of the former with the element at the same position in the latter.

    Returns a stream formed from this stream and the specified stream that by associating each element of the former with the element at the same position in the latter. If one of the two streams 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

    Stream({a0,b0}, ..., {amin(m,n),bmin(m,n))} when Stream(a0, ..., am) zip Stream(b0, ..., bn) is invoked.

    Attributes
    final
    Definition Classes
    StreamIterableLike → GenIterableLike
  219. def zip [A1 >: A, B, That] (that: Iterable[B])(implicit bf: CanBuildFrom[Stream[A], (A1, B), That]): That

    Definition Classes
    IterableLike
    Annotations
    @bridge()
  220. def zipAll [B, A1 >: A, That] (that: Iterable[B], thisElem: A1, thatElem: B)(implicit bf: CanBuildFrom[Stream[A], (A1, B), That]): That

    Definition Classes
    IterableLike
    Annotations
    @bridge()
  221. def zipAll [B] (that: Iterable[B], thisElem: A, thatElem: B): Stream[(A, B)]

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

    [use case]

    Returns a stream formed from this stream 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 stream is shorter than that.

    thatElem

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

    returns

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

    Attributes
    abstract
    Definition Classes
    GenIterableLike
  222. def zipAll [B, A1 >: A, That] (that: GenIterable[B], thisElem: A1, thatElem: B)(implicit bf: CanBuildFrom[Stream[A], (A1, B), That]): That

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

    Returns a stream formed from this stream 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 stream is shorter than that.

    thatElem

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

    returns

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

    Definition Classes
    IterableLike → GenIterableLike
  223. def zipWithIndex [A1 >: A, That] (implicit bf: CanBuildFrom[Stream[A], (A1, Int), That]): That

    Zips this iterable with its indices.

    Zips this iterable with its indices. s.zipWithIndex is equivalent to s zip s.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 stream paired with their index. Indices start at 0.

    Definition Classes
    StreamIterableLike → GenIterableLike
  224. def elements : Iterator[A]

    Definition Classes
    IterableLike
    Annotations
    @deprecated
    Deprecated

    use iterator' instead

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

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

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

    Definition Classes
    SeqLike
    Annotations
    @deprecated
    Deprecated

    use corresponds instead

  226. 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

    Use indexWhere(p) instead.

  227. 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

    use lastIndexWhere instead

  228. def first : A

    Definition Classes
    IterableLike
    Annotations
    @deprecated
    Deprecated

    use head' instead

  229. def firstOption : Option[A]

    None if iterable is empty.

    None if iterable is empty.

    Definition Classes
    IterableLike
    Annotations
    @deprecated
    Deprecated

    use headOption' instead

  230. def projection : SeqView[A, Stream[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
    SeqLikeIterableLike
    Annotations
    @deprecated
    Deprecated

    use view' instead

  231. def reversedElements : Iterator[A]

    Definition Classes
    SeqLike
    Annotations
    @deprecated
    Deprecated

    use reverseIterator' instead

Inherited from Serializable

Inherited from Serializable

Inherited from Stream[A]

Inherited from LinearSeqOptimized[A, Stream[A]]

Inherited from LinearSeq[A]

Inherited from LinearSeq[A]

Inherited from LinearSeqLike[A, Stream[A]]

Inherited from Seq[A]

Inherited from Seq[A]

Inherited from SeqLike[A, Stream[A]]

Inherited from GenSeq[A]

Inherited from GenSeqLike[A, Stream[A]]

Inherited from PartialFunction[Int, A]

Inherited from (Int) ⇒ A

Inherited from Iterable[A]

Inherited from Iterable[A]

Inherited from IterableLike[A, Stream[A]]

Inherited from Equals

Inherited from GenIterable[A]

Inherited from GenIterableLike[A, Stream[A]]

Inherited from Traversable[A]

Inherited from Immutable

Inherited from Traversable[A]

Inherited from GenTraversable[A]

Inherited from GenericTraversableTemplate[A, Stream]

Inherited from TraversableLike[A, Stream[A]]

Inherited from GenTraversableLike[A, Stream[A]]

Inherited from Parallelizable[A, ParSeq[A]]

Inherited from TraversableOnce[A]

Inherited from GenTraversableOnce[A]

Inherited from FilterMonadic[A, Stream[A]]

Inherited from HasNewBuilder[A, Stream[A]]

Inherited from AnyRef

Inherited from Any