scala.collection

GenSeqLike

trait GenSeqLike[+A, +Repr] extends GenIterableLike[A, Repr] with Equals with Parallelizable[A, ParSeq[A]]

A template trait for all sequences which may be traversed in parallel.

Source
GenSeqLike.scala
Linear Supertypes
Known Subclasses
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  1. GenSeqLike
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  4. GenTraversableLike
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  6. GenTraversableOnce
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Abstract Value Members

  1. abstract def ++[B >: A, That](that: GenTraversableOnce[B])(implicit bf: CanBuildFrom[Repr, B, That]): That

    Returns a new general sequence containing the elements from the left hand operand followed by the elements from the right hand operand.

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

    Example:

        scala> val a = LinkedList(1)
        a: scala.collection.mutable.LinkedList[Int] = LinkedList(1)
    
        scala> val b = LinkedList(2)
        b: scala.collection.mutable.LinkedList[Int] = LinkedList(2)
    
        scala> val c = a ++ b
        c: scala.collection.mutable.LinkedList[Int] = LinkedList(1, 2)
    
        scala> val d = LinkedList('a')
        d: scala.collection.mutable.LinkedList[Char] = LinkedList(a)
    
        scala> val e = c ++ d
        e: scala.collection.mutable.LinkedList[AnyVal] = LinkedList(1, 2, a)
    
    B

    the element type of the returned collection.

    That

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

    that

    the traversable to append.

    bf

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

    returns

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

    Definition Classes
    GenTraversableLike
  2. abstract def +:[B >: A, That](elem: B)(implicit bf: CanBuildFrom[Repr, B, That]): That

    A copy of the general sequence with an element prepended.

    A copy of the general sequence with an element prepended.

    Note that :-ending operators are right associative (see example). Also, the original general sequence is not modified, so you will want to capture the result.

    Example:

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

    the element type of the returned general sequence.

    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 and the new element type B.

    returns

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

  3. abstract def /:[B](z: B)(op: (B, A) ⇒ B): B

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

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

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

    Examples:

    Note that the folding function used to compute b is equivalent to that used to compute c.

         scala> val a = LinkedList(1,2,3,4)
         a: scala.collection.mutable.LinkedList[Int] = LinkedList(1, 2, 3, 4)
    
         scala> val b = (5 /: a)(_+_)
         b: Int = 15
    
         scala> val c = (5 /: a)((x,y) => x + y)
         c: Int = 15
    

    Note: will not terminate for infinite-sized collections.

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

    B

    the result type of the binary operator.

    z

    the start value.

    op

    the binary operator.

    returns

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

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

    where x1, ..., xn are the elements of this general sequence.

    Definition Classes
    GenTraversableOnce
  4. abstract def :+[B >: A, That](elem: B)(implicit bf: CanBuildFrom[Repr, B, That]): That

    A copy of this general sequence with an element appended.

    A copy of this general sequence with an element appended.

    Note: will not terminate for infinite-sized collections.

    B

    the element type of the returned general sequence.

    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 and the new element type B.

    returns

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

  5. abstract def :\[B](z: B)(op: (A, B) ⇒ B): B

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

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

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

    Note: will not terminate for infinite-sized collections.

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

    Examples:

    Note that the folding function used to compute b is equivalent to that used to compute c.

         scala> val a = LinkedList(1,2,3,4)
         a: scala.collection.mutable.LinkedList[Int] = LinkedList(1, 2, 3, 4)
    
         scala> val b = (a :\ 5)(_+_)
         b: Int = 15
    
         scala> val c = (a :\ 5)((x,y) => x + y)
         c: Int = 15
    
    
    B

    the result type of the binary operator.

    z

    the start value

    op

    the binary operator

    returns

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

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

    where x1, ..., xn are the elements of this general sequence.

    Definition Classes
    GenTraversableOnce
  6. abstract def aggregate[B](z: B)(seqop: (B, A) ⇒ B, combop: (B, B) ⇒ B): B

    Aggregates the results of applying an operator to subsequent elements.

    Aggregates the results of applying an operator to subsequent elements.

    This is a more general form of fold and reduce. It has similar semantics, but does not require the result to be a supertype of the element type. It traverses the elements in different partitions sequentially, using seqop to update the result, and then applies combop to results from different partitions. The implementation of this operation may operate on an arbitrary number of collection partitions, so combop may be invoked an arbitrary number of times.

    For example, one might want to process some elements and then produce a Set. In this case, seqop would process an element and append it to the list, while combop would concatenate two lists from different partitions together. The initial value z would be an empty set.

       pc.aggregate(Set[Int]())(_ += process(_), _ ++ _)
    

    Another example is calculating geometric mean from a collection of doubles (one would typically require big doubles for this).

    B

    the type of accumulated results

    z

    the initial value for the accumulated result of the partition - this will typically be the neutral element for the seqop operator (e.g. Nil for list concatenation or 0 for summation)

    seqop

    an operator used to accumulate results within a partition

    combop

    an associative operator used to combine results from different partitions

    Definition Classes
    GenTraversableOnce
  7. abstract def apply(idx: Int): A

    Selects an element by its index in the general sequence.

    Selects an element by its index in the general sequence.

    Example:

       scala> val x = LinkedList(1, 2, 3, 4, 5)
       x: scala.collection.mutable.LinkedList[Int] = LinkedList(1, 2, 3, 4, 5)
    
       scala> x(3)
       res1: Int = 4
    
    idx

    The index to select.

    returns

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

    Exceptions thrown
    `IndexOutOfBoundsException`

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

  8. abstract def canEqual(that: Any): Boolean

    A method that should be called from every well-designed equals method that is open to be overridden in a subclass.

    A method that should be called from every well-designed equals method that is open to be overridden in a subclass. See Programming in Scala, Chapter 28 for discussion and design.

    that

    the value being probed for possible equality

    returns

    true if this instance can possibly equal that, otherwise false

    Definition Classes
    Equals
  9. abstract def collect[B, That](pf: PartialFunction[A, B])(implicit bf: CanBuildFrom[Repr, B, That]): That

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

    Builds a new collection by applying a partial function to all elements of this general sequence 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 general sequence.

    bf

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

    returns

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

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

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

    Copies values of this general sequence to an array.

    Copies values of this general sequence to an array. Fills the given array xs with values of this general sequence, beginning at index start. Copying will stop once either the end of the current general sequence 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
    GenTraversableOnce
  12. abstract def copyToArray[B >: A](xs: Array[B]): Unit

    Copies values of this general sequence to an array.

    Copies values of this general sequence to an array. Fills the given array xs with values of this general sequence. Copying will stop once either the end of the current general sequence 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
    GenTraversableOnce
  13. abstract def corresponds[B](that: GenSeq[B])(p: (A, B) ⇒ Boolean): Boolean

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

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

  14. abstract def count(p: (A) ⇒ Boolean): Int

    Counts the number of elements in the general sequence which satisfy a predicate.

    Counts the number of elements in the general sequence which satisfy a predicate.

    p

    the predicate used to test elements.

    returns

    the number of elements satisfying the predicate p.

    Definition Classes
    GenTraversableOnce
  15. abstract def diff[B >: A](that: GenSeq[B]): Repr

    Computes the multiset difference between this general sequence and another sequence.

    Computes the multiset difference between this general sequence and another sequence.

    Note: will not terminate for infinite-sized collections.

    B

    the element type of the returned general sequence.

    that

    the sequence of elements to remove

    returns

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

  16. abstract def distinct: Repr

    Builds a new general sequence from this general sequence without any duplicate elements.

    Builds a new general sequence from this general sequence without any duplicate elements.

    Note: will not terminate for infinite-sized collections.

    returns

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

  17. abstract def drop(n: Int): Repr

    Selects all elements except first n ones.

    Selects all elements except first n ones.

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

    n

    the number of elements to drop from this general sequence.

    returns

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

    Definition Classes
    GenTraversableLike
  18. abstract def dropWhile(pred: (A) ⇒ Boolean): Repr

    Drops longest prefix of elements that satisfy a predicate.

    Drops longest prefix of elements that satisfy a predicate.

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

    returns

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

    Definition Classes
    GenTraversableLike
  19. abstract def endsWith[B](that: GenSeq[B]): Boolean

    Tests whether this general sequence ends with the given sequence.

    Tests whether this general sequence ends with the given sequence.

    Note: will not terminate for infinite-sized collections.

    that

    the sequence to test

    returns

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

  20. abstract def exists(pred: (A) ⇒ Boolean): Boolean

    Definition Classes
    GenTraversableOnce
  21. abstract def filter(pred: (A) ⇒ Boolean): Repr

    Selects all elements of this general sequence which satisfy a predicate.

    Selects all elements of this general sequence which satisfy a predicate.

    returns

    a new general sequence consisting of all elements of this general sequence that satisfy the given predicate p. Their order may not be preserved.

    Definition Classes
    GenTraversableLike
  22. abstract def filterNot(pred: (A) ⇒ Boolean): Repr

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

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

    returns

    a new general sequence consisting of all elements of this general sequence that do not satisfy the given predicate p. Their order may not be preserved.

    Definition Classes
    GenTraversableLike
  23. abstract def find(pred: (A) ⇒ Boolean): Option[A]

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

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

    Note: may not terminate for infinite-sized collections.

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

    returns

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

    Definition Classes
    GenTraversableOnce
  24. abstract def flatMap[B, That](f: (A) ⇒ GenTraversableOnce[B])(implicit bf: CanBuildFrom[Repr, B, That]): That

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

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

     def getWords(lines: Seq[String]): Seq[String] = lines flatMap (line => line split "\\W+")
    

    The type of the resulting collection is guided by the static type of general sequence. This might cause unexpected results sometimes. For example:

     // lettersOf will return a Seq[Char] of likely repeated letters, instead of a Set
     def lettersOf(words: Seq[String]) = words flatMap (word => word.toSet)
    
     // lettersOf will return a Set[Char], not a Seq
     def lettersOf(words: Seq[String]) = words.toSet flatMap (word => word.toSeq)
    
     // xs will be a an Iterable[Int]
     val xs = Map("a" -> List(11,111), "b" -> List(22,222)).flatMap(_._2)
    
     // ys will be a Map[Int, Int]
     val ys = Map("a" -> List(1 -> 11,1 -> 111), "b" -> List(2 -> 22,2 -> 222)).flatMap(_._2)
    
    B

    the element type of the returned collection.

    That

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

    f

    the function to apply to each element.

    bf

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

    returns

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

    Definition Classes
    GenTraversableLike
  25. abstract def fold[A1 >: A](z: A1)(op: (A1, A1) ⇒ A1): A1

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

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

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

    A1

    a type parameter for the binary operator, a supertype of A.

    z

    a neutral element for the fold operation; may be added to the result an arbitrary number of times, and must not change the result (e.g., Nil for list concatenation, 0 for addition, or 1 for multiplication.)

    op

    a binary operator that must be associative

    returns

    the result of applying fold operator op between all the elements and z

    Definition Classes
    GenTraversableOnce
  26. abstract def foldLeft[B](z: B)(op: (B, A) ⇒ B): B

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

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

    Note: will not terminate for infinite-sized collections.

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

    B

    the result type of the binary operator.

    z

    the start value.

    op

    the binary operator.

    returns

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

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

    where x1, ..., xn are the elements of this general sequence.

    Definition Classes
    GenTraversableOnce
  27. abstract def foldRight[B](z: B)(op: (A, B) ⇒ B): B

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

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

    Note: will not terminate for infinite-sized collections.

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

    B

    the result type of the binary operator.

    z

    the start value.

    op

    the binary operator.

    returns

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

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

    where x1, ..., xn are the elements of this general sequence.

    Definition Classes
    GenTraversableOnce
  28. abstract def forall(pred: (A) ⇒ Boolean): Boolean

    Definition Classes
    GenTraversableOnce
  29. abstract def foreach[U](f: (A) ⇒ U): Unit

    Applies a function f to all elements of this general sequence.

    Applies a function f to all elements of this general sequence.

    U

    the type parameter describing the result of function f. This result will always be ignored. Typically U is Unit, but this is not necessary.

    f

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

    Definition Classes
    GenTraversableLikeGenTraversableOnce
  30. abstract def groupBy[K](f: (A) ⇒ K): GenMap[K, Repr]

    Partitions this general sequence into a map of general sequences according to some discriminator function.

    Partitions this general sequence into a map of general sequences 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 general sequence.

    K

    the type of keys returned by the discriminator function.

    f

    the discriminator function.

    returns

    A map from keys to general sequences 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 general sequence of those elements x for which f(x) equals k.

    Definition Classes
    GenTraversableLike
  31. abstract def hasDefiniteSize: Boolean

    Definition Classes
    GenTraversableOnce
  32. abstract 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 general sequence that satisfies the predicate p, or -1, if none exists.

  33. abstract def intersect[B >: A](that: GenSeq[B]): Repr

    Computes the multiset intersection between this general sequence and another sequence.

    Computes the multiset intersection between this general sequence and another sequence.

    Note: may not terminate for infinite-sized collections.

    B

    the element type of the returned general sequence.

    that

    the sequence of elements to intersect with.

    returns

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

  34. abstract def iterator: Iterator[A]

    Definition Classes
    GenIterableLike
  35. abstract 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 general sequence that satisfies the predicate p, or -1, if none exists.

  36. abstract def length: Int

    The length of the general sequence.

    The length of the general sequence.

    Note: will not terminate for infinite-sized collections.

    Note: xs.length and xs.size yield the same result.

    returns

    the number of elements in this general sequence.

  37. abstract def map[B, That](f: (A) ⇒ B)(implicit bf: CanBuildFrom[Repr, B, That]): That

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

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

    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 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 general sequence and collecting the results.

    Definition Classes
    GenTraversableLike
  38. abstract def max[A1 >: A](implicit ord: Ordering[A1]): A

    Finds the largest element.

    Finds the largest element.

    returns

    the largest element of this general sequence with respect to the ordering cmp.

    Definition Classes
    GenTraversableOnce
  39. abstract def maxBy[B](f: (A) ⇒ B)(implicit cmp: Ordering[B]): A

    Definition Classes
    GenTraversableOnce
  40. abstract def min[A1 >: A](implicit ord: Ordering[A1]): A

    Finds the smallest element.

    Finds the smallest element.

    returns

    the smallest element of this general sequence with respect to the ordering cmp.

    Definition Classes
    GenTraversableOnce
  41. abstract def minBy[B](f: (A) ⇒ B)(implicit cmp: Ordering[B]): A

    Definition Classes
    GenTraversableOnce
  42. abstract def mkString: String

    Displays all elements of this general sequence in a string.

    Displays all elements of this general sequence in a string.

    returns

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

    Definition Classes
    GenTraversableOnce
  43. abstract def mkString(sep: String): String

    Displays all elements of this general sequence in a string using a separator string.

    Displays all elements of this general sequence in a string using a separator string.

    sep

    the separator string.

    returns

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

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

  44. abstract def mkString(start: String, sep: String, end: String): String

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

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

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

  45. abstract def nonEmpty: Boolean

    Tests whether the general sequence is not empty.

    Tests whether the general sequence is not empty.

    returns

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

    Definition Classes
    GenTraversableOnce
  46. abstract def padTo[B >: A, That](len: Int, elem: B)(implicit bf: CanBuildFrom[Repr, B, That]): That

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

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

    B

    the element type of the returned general sequence.

    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 and the new element type B.

    returns

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

  47. abstract 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
    Parallelizable
  48. abstract def partition(pred: (A) ⇒ Boolean): (Repr, Repr)

    Partitions this general sequence in two general sequences according to a predicate.

    Partitions this general sequence in two general sequences according to a predicate.

    returns

    a pair of general sequences: the first general sequence consists of all elements that satisfy the predicate p and the second general sequence consists of all elements that don't. The relative order of the elements in the resulting general sequences may not be preserved.

    Definition Classes
    GenTraversableLike
  49. abstract def patch[B >: A, That](from: Int, patch: GenSeq[B], replaced: Int)(implicit bf: CanBuildFrom[Repr, B, That]): That

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

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

    B

    the element type of the returned general sequence.

    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 general sequence

    bf

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

    returns

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

  50. abstract def product[A1 >: A](implicit num: Numeric[A1]): A1

    Multiplies up the elements of this collection.

    Multiplies up the elements of this collection.

    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 general sequence with respect to the * operator in num.

    Definition Classes
    GenTraversableOnce
  51. abstract def reduce[A1 >: A](op: (A1, A1) ⇒ A1): A1

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

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

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

    A1

    A type parameter for the binary operator, a supertype of A.

    op

    A binary operator that must be associative.

    returns

    The result of applying reduce operator op between all the elements if the general sequence is nonempty.

    Definition Classes
    GenTraversableOnce
    Exceptions thrown
    UnsupportedOperationException

    if this general sequence is empty.

  52. abstract def reduceLeftOption[B >: A](op: (B, A) ⇒ B): Option[B]

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

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

    Note: will not terminate for infinite-sized collections.

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

    B

    the result type of the binary operator.

    op

    the binary operator.

    returns

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

    Definition Classes
    GenTraversableOnce
  53. abstract def reduceOption[A1 >: A](op: (A1, A1) ⇒ A1): Option[A1]

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

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

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

    A1

    A type parameter for the binary operator, a supertype of A.

    op

    A binary operator that must be associative.

    returns

    An option value containing result of applying reduce operator op between all the elements if the collection is nonempty, and None otherwise.

    Definition Classes
    GenTraversableOnce
  54. abstract def reduceRight[B >: A](op: (A, B) ⇒ B): B

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

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

    Note: will not terminate for infinite-sized collections.

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

    B

    the result type of the binary operator.

    op

    the binary operator.

    returns

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

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

    where x1, ..., xn are the elements of this general sequence.

    Definition Classes
    GenTraversableOnce
    Exceptions thrown
    `UnsupportedOperationException`

    if this general sequence is empty.

  55. abstract def reduceRightOption[B >: A](op: (A, B) ⇒ B): Option[B]

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

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

    Note: will not terminate for infinite-sized collections.

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

    B

    the result type of the binary operator.

    op

    the binary operator.

    returns

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

    Definition Classes
    GenTraversableOnce
  56. abstract def repr: Repr

    Definition Classes
    GenTraversableLike
  57. abstract def reverse: Repr

    Returns new general sequence wih elements in reversed order.

    Returns new general sequence wih elements in reversed order.

    Note: will not terminate for infinite-sized collections.

    returns

    A new general sequence with all elements of this general sequence in reversed order.

  58. abstract def reverseMap[B, That](f: (A) ⇒ B)(implicit bf: CanBuildFrom[Repr, B, That]): That

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

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

  59. abstract def sameElements[A1 >: A](that: GenIterable[A1]): Boolean

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

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

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

    Note: will not terminate for infinite-sized collections.

    that

    the collection to compare with.

    returns

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

    Definition Classes
    GenIterableLike
  60. abstract def scan[B >: A, That](z: B)(op: (B, B) ⇒ B)(implicit cbf: CanBuildFrom[Repr, 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 general sequence containing the prefix scan of the elements in this general sequence

    Definition Classes
    GenTraversableLike
  61. abstract def scanLeft[B, That](z: B)(op: (B, A) ⇒ B)(implicit bf: CanBuildFrom[Repr, B, That]): That

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

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

    Note: will not terminate for infinite-sized collections.

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

    B

    the type of the elements in the resulting collection

    That

    the actual type of the resulting collection

    z

    the initial value

    op

    the binary operator applied to the intermediate result and the element

    bf

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

    returns

    collection with intermediate results

    Definition Classes
    GenTraversableLike
  62. abstract def scanRight[B, That](z: B)(op: (A, B) ⇒ B)(implicit bf: CanBuildFrom[Repr, B, That]): That

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

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

    Note: will not terminate for infinite-sized collections.

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

    Example:

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

    the type of the elements in the resulting collection

    That

    the actual type of the resulting collection

    z

    the initial value

    op

    the binary operator applied to the intermediate result and the element

    bf

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

    returns

    collection with intermediate results

    Definition Classes
    GenTraversableLike
    Annotations
    @migration
    Migration

    (Changed in version 2.9.0) The behavior of scanRight has changed. The previous behavior can be reproduced with scanRight.reverse.

  63. abstract 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 general sequence starting from index from such that every element of the segment satisfies the predicate p.

  64. abstract def seq: TraversableOnce[A]

    Definition Classes
    Parallelizable
  65. abstract def size: Int

    The size of this general sequence.

    The size of this general sequence.

    Note: will not terminate for infinite-sized collections.

    returns

    the number of elements in this general sequence.

    Definition Classes
    GenTraversableLikeGenTraversableOnce
  66. abstract def slice(unc_from: Int, unc_until: Int): Repr

    Selects an interval of elements.

    Selects an interval of elements. The returned collection is made up of all elements x which satisfy the invariant:

       from <= indexOf(x) < until
    

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

    returns

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

    Definition Classes
    GenTraversableLike
  67. abstract def span(pred: (A) ⇒ Boolean): (Repr, Repr)

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

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

    Note: c span p is equivalent to (but possibly more efficient than) (c takeWhile p, c dropWhile p), provided the evaluation of the predicate p does not cause any side-effects.

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

    returns

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

    Definition Classes
    GenTraversableLike
  68. abstract def splitAt(n: Int): (Repr, Repr)

    Splits this general sequence into two at a given position.

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

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

    n

    the position at which to split.

    returns

    a pair of general sequences consisting of the first n elements of this general sequence, and the other elements.

    Definition Classes
    GenTraversableLike
  69. abstract def startsWith[B](that: GenSeq[B], offset: Int): Boolean

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

    Tests whether this general sequence 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 general sequence at index offset, otherwise false.

  70. abstract def stringPrefix: String

    Defines the prefix of this object's toString representation.

    Defines the prefix of this object's toString representation.

    returns

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

    Definition Classes
    GenTraversableLike
  71. abstract def sum[A1 >: A](implicit num: Numeric[A1]): A1

    Sums up the elements of this collection.

    Sums up the elements of this collection.

    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 general sequence with respect to the + operator in num.

    Definition Classes
    GenTraversableOnce
  72. abstract def take(n: Int): Repr

    Selects first n elements.

    Selects first n elements.

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

    n

    Tt number of elements to take from this general sequence.

    returns

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

    Definition Classes
    GenTraversableLike
  73. abstract def takeWhile(pred: (A) ⇒ Boolean): Repr

    Takes longest prefix of elements that satisfy a predicate.

    Takes longest prefix of elements that satisfy a predicate.

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

    returns

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

    Definition Classes
    GenTraversableLike
  74. abstract def toArray[A1 >: A](implicit arg0: ClassManifest[A1]): Array[A1]

    Converts this general sequence to an array.

    Converts this general sequence to an array.

    Note: will not terminate for infinite-sized collections.

    returns

    an array containing all elements of this general sequence.

    Definition Classes
    GenTraversableOnce
  75. abstract def toBuffer[A1 >: A]: Buffer[A1]

    Converts this general sequence to a mutable buffer.

    Converts this general sequence to a mutable buffer.

    Note: will not terminate for infinite-sized collections.

    returns

    a buffer containing all elements of this general sequence.

    Definition Classes
    GenTraversableOnce
  76. abstract def toIndexedSeq[A1 >: A]: IndexedSeq[A1]

    Converts this general sequence to an indexed sequence.

    Converts this general sequence to an indexed sequence.

    Note: will not terminate for infinite-sized collections.

    returns

    an indexed sequence containing all elements of this general sequence.

    Definition Classes
    GenTraversableOnce
  77. abstract def toIterable: GenIterable[A]

    Converts this general sequence to an iterable collection.

    Converts this general sequence 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 general sequence.

    Definition Classes
    GenTraversableOnce
  78. abstract def toIterator: Iterator[A]

    Returns an Iterator over the elements in this general sequence.

    Returns an Iterator over the elements in this general sequence. 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 general sequence.

    Definition Classes
    GenTraversableOnce
  79. abstract def toList: List[A]

    Converts this general sequence to a list.

    Converts this general sequence to a list.

    Note: will not terminate for infinite-sized collections.

    returns

    a list containing all elements of this general sequence.

    Definition Classes
    GenTraversableOnce
  80. abstract def toMap[K, V](implicit ev: <:<[A, (K, V)]): GenMap[K, V]

    Converts this general sequence to a map.

    Converts this general sequence 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 general sequence.

    Definition Classes
    GenTraversableOnce
  81. abstract def toSeq: GenSeq[A]

    Converts this general sequence to a sequence.

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

    Note: will not terminate for infinite-sized collections.

    returns

    a sequence containing all elements of this general sequence.

    Definition Classes
    GenSeqLikeGenTraversableOnce
  82. abstract def toSet[A1 >: A]: GenSet[A1]

    Converts this general sequence to a set.

    Converts this general sequence to a set.

    Note: will not terminate for infinite-sized collections.

    returns

    a set containing all elements of this general sequence.

    Definition Classes
    GenTraversableOnce
  83. abstract def toStream: Stream[A]

    Converts this general sequence to a stream.

    Converts this general sequence to a stream.

    Note: will not terminate for infinite-sized collections.

    returns

    a stream containing all elements of this general sequence.

    Definition Classes
    GenTraversableOnce
  84. abstract def toTraversable: GenTraversable[A]

    Converts this general sequence to an unspecified Traversable.

    Converts this general sequence 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 general sequence.

    Definition Classes
    GenTraversableOnce
  85. abstract def updated[B >: A, That](index: Int, elem: B)(implicit bf: CanBuildFrom[Repr, B, That]): That

    A copy of this general sequence with one single replaced element.

    A copy of this general sequence with one single replaced element.

    B

    the element type of the returned general sequence.

    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 and the new element type B.

    returns

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

  86. abstract def zip[A1 >: A, B, That](that: GenIterable[B])(implicit bf: CanBuildFrom[Repr, (A1, B), That]): That

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

    Returns a general sequence formed from this general sequence and another iterable collection by combining corresponding elements in pairs. If one of the two collections is longer than the other, its remaining elements are ignored.

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

    A1

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

    B

    the type of the second half of the returned pairs

    That

    the class of the returned collection. Where possible, That is the same class as the current collection class Repr, but this depends on the element type (A1, B) being admissible for that class, which means that an implicit instance of type CanBuildFrom[Repr, (A1, B), That]. is found.

    that

    The iterable providing the second half of each result pair

    bf

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

    returns

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

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

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

    Returns a general sequence formed from this general sequence 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.

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

    that

    the iterable providing the second half of each result pair

    thisElem

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

    thatElem

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

    returns

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

    Definition Classes
    GenIterableLike
  88. abstract def zipWithIndex[A1 >: A, That](implicit bf: CanBuildFrom[Repr, (A1, Int), That]): That

    Zips this general sequence with its indices.

    Zips this general sequence with its indices.

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

    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 general sequence paired with their index. Indices start at 0.

    Definition Classes
    GenIterableLike

Concrete Value Members

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

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

    Test two objects for inequality.

    Test two objects for inequality.

    returns

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

    Definition Classes
    Any
  3. final def ##(): Int

    Equivalent to x.hashCode except for boxed numeric types.

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

    returns

    a hash value consistent with ==

    Definition Classes
    AnyRef → Any
  4. abstract def ++[B](that: GenTraversableOnce[B]): GenSeq[B]

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

    [use case]

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

    B

    the element type of the returned collection.

    that

    the traversable to append.

    returns

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

    Definition Classes
    GenTraversableLike
  5. abstract def +:(elem: A): GenSeq[A]

    [use case] A copy of the general sequence with an element prepended.

    [use case]

    A copy of the general sequence with an element prepended.

    elem

    the prepended element

    returns

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

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

    A syntactic sugar for out of order folding.

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

    Example:

         scala> val a = LinkedList(1,2,3,4)
         a: scala.collection.mutable.LinkedList[Int] = LinkedList(1, 2, 3, 4)
    
         scala> val b = (a /:\ 5)(_+_)
         b: Int = 15
    
    Definition Classes
    GenTraversableOnce
  7. abstract def :+(elem: A): GenSeq[A]

    [use case] A copy of this general sequence with an element appended.

    [use case]

    A copy of this general sequence with an element appended.

    elem

    the appended element

    returns

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

  8. final def ==(arg0: AnyRef): Boolean

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

    Test two objects for equality.

    Test two objects for equality.

    returns

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

    Definition Classes
    Any
  10. final def asInstanceOf[T0]: T0

    Cast the receiver object to be of type T0.

    Cast the receiver object to be of type T0.

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

    returns

    the receiver object.

    Definition Classes
    Any
    Exceptions thrown
    ClassCastException

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

  11. def clone(): AnyRef

    Create a copy of the receiver object.

    Create a copy of the receiver object.

    The default implementation of the clone method is platform dependent.

    returns

    a copy of the receiver object.

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

    not specified by SLS as a member of AnyRef

  12. abstract def collect[B](pf: PartialFunction[A, B]): GenSeq[B]

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

    [use case]

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

    B

    the element type of the returned collection.

    pf

    the partial function which filters and maps the general sequence.

    returns

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

    Definition Classes
    GenTraversableLike
  13. abstract def copyToArray(xs: Array[A], start: Int): Unit

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

    [use case]

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

    xs

    the array to fill.

    start

    the starting index.

    Definition Classes
    GenTraversableOnce
  14. abstract def copyToArray(xs: Array[A]): Unit

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

    [use case]

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

    xs

    the array to fill.

    Definition Classes
    GenTraversableOnce
  15. abstract def diff(that: GenSeq[A]): GenSeq[A]

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

    [use case]

    Computes the multiset difference between this general sequence 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 general sequence 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.

  16. final def eq(arg0: AnyRef): Boolean

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

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

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

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

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

    returns

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

    Definition Classes
    AnyRef
  17. 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
    GenSeqLikeEquals → AnyRef → Any
  18. def finalize(): Unit

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

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

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

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

    not specified by SLS as a member of AnyRef

  19. abstract def flatMap[B](f: (A) ⇒ GenTraversableOnce[B]): GenSeq[B]

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

    [use case]

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

    B

    the element type of the returned collection.

    f

    the function to apply to each element.

    returns

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

    Definition Classes
    GenTraversableLike
  20. abstract def foreach(f: (A) ⇒ Unit): Unit

    [use case] Applies a function f to all elements of this general sequence.

    [use case]

    Applies a function f to all elements of this general sequence.

    f

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

    Definition Classes
    GenTraversableLike
  21. final def getClass(): java.lang.Class[_]

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

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

    The nature of the representation is platform dependent.

    returns

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

    Definition Classes
    AnyRef → Any
    Note

    not specified by SLS as a member of AnyRef

  22. def hashCode(): Int

    Hashcodes for GenSeq produce a value from the hashcodes of all the elements of the general sequence.

    Hashcodes for GenSeq produce a value from the hashcodes of all the elements of the general sequence.

    returns

    the hash code value for this object.

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

    Definition Classes
    GenIterableLikeGenTraversableLike
  24. abstract def indexOf(elem: A, from: Int): Int

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

    [use case]

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

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

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

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

  26. abstract def indexOf(elem: A): Int

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

    [use case]

    Finds index of first occurrence of some value in this general sequence.

    elem

    the element value to search for.

    returns

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

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

    Finds index of first occurrence of some value in this general sequence.

    Finds index of first occurrence of some value in this general sequence.

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

  28. 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 general sequence that satisfies the predicate p, or -1, if none exists.

  29. abstract def intersect(that: GenSeq[A]): GenSeq[A]

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

    [use case]

    Computes the multiset intersection between this general sequence 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 general sequence 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.

  30. def isDefinedAt(idx: Int): Boolean

    Tests whether this general sequence contains given index.

    Tests whether this general sequence contains given index.

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

    idx

    the index to test

    returns

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

  31. def isEmpty: Boolean

    Tests whether the general sequence is empty.

    Tests whether the general sequence is empty.

    returns

    true if the general sequence contains no elements, false otherwise.

    Definition Classes
    GenIterableLikeGenTraversableOnce
  32. final def isInstanceOf[T0]: Boolean

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

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

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

    returns

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

    Definition Classes
    Any
  33. final def isTraversableAgain: Boolean

    Tests whether this general sequence can be repeatedly traversed.

    Tests whether this general sequence can be repeatedly traversed.

    returns

    true

    Definition Classes
    GenTraversableLikeGenTraversableOnce
  34. abstract def lastIndexOf(elem: A, end: Int): Int

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

    [use case]

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

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

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

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

  36. abstract def lastIndexOf(elem: A): Int

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

    [use case]

    Finds index of last occurrence of some value in this general sequence.

    elem

    the element value to search for.

    returns

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

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

    Finds index of last occurrence of some value in this general sequence.

    Finds index of last occurrence of some value in this general sequence.

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

  38. 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 general sequence that satisfies the predicate p, or -1, if none exists.

  39. abstract def map[B](f: (A) ⇒ B): GenSeq[B]

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

    [use case]

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

    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 general sequence and collecting the results.

    Definition Classes
    GenTraversableLike
  40. abstract def max: A

    [use case] Finds the largest element.

    [use case]

    Finds the largest element.

    returns

    the largest element of this general sequence with respect to the ordering cmp.

    Definition Classes
    GenTraversableOnce
  41. abstract def min: A

    [use case] Finds the smallest element.

    [use case]

    Finds the smallest element.

    returns

    the smallest element of this general sequence with respect to the ordering cmp.

    Definition Classes
    GenTraversableOnce
  42. final def ne(arg0: AnyRef): Boolean

    Equivalent to !(this eq that).

    Equivalent to !(this eq that).

    returns

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

    Definition Classes
    AnyRef
  43. final def notify(): Unit

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

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

    Definition Classes
    AnyRef
    Note

    not specified by SLS as a member of AnyRef

  44. final def notifyAll(): Unit

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

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

    Definition Classes
    AnyRef
    Note

    not specified by SLS as a member of AnyRef

  45. abstract def padTo(len: Int, elem: A): GenSeq[A]

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

    [use case]

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

    len

    the target length

    elem

    the padding value

    returns

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

  46. 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
  47. abstract def patch(from: Int, that: GenSeq[A], replaced: Int): GenSeq[A]

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

    [use case]

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

    from

    the index of the first replaced element

    replaced

    the number of elements to drop in the original general sequence

    returns

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

  48. 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 general sequence such that every element of the segment satisfies the predicate p.

  49. abstract def product: A

    [use case] Multiplies up the elements of this collection.

    [use case]

    Multiplies up the elements of this collection.

    returns

    the product of all elements of this general sequence with respect to the * operator in num.

    Definition Classes
    GenTraversableOnce
  50. abstract def reverseMap[B](f: (A) ⇒ B): GenSeq[B]

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

    [use case]

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

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

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

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

    [use case]

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

    that

    the collection to compare with.

    returns

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

    Definition Classes
    GenIterableLike
  52. def startsWith[B](that: GenSeq[B]): Boolean

    Tests whether this general sequence starts with the given sequence.

    Tests whether this general sequence starts with the given sequence.

    that

    the sequence to test

    returns

    true if this collection has that as a prefix, false otherwise.

  53. abstract def sum: A

    [use case] Sums up the elements of this collection.

    [use case]

    Sums up the elements of this collection.

    returns

    the sum of all elements of this general sequence with respect to the + operator in num.

    Definition Classes
    GenTraversableOnce
  54. final def synchronized[T0](arg0: ⇒ T0): T0

    Definition Classes
    AnyRef
  55. def tail: Repr

    Selects all elements except the first.

    Selects all elements except the first.

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

    returns

    a general sequence consisting of all elements of this general sequence except the first one.

    Definition Classes
    GenTraversableLike
    Exceptions thrown
    `UnsupportedOperationException`

    if the general sequence is empty.

  56. abstract def toArray: Array[A]

    [use case] Converts this general sequence to an array.

    [use case]

    Converts this general sequence to an array.

    Note: will not terminate for infinite-sized collections.

    returns

    an array containing all elements of this general sequence.

    Definition Classes
    GenTraversableOnce
  57. abstract def toMap[T, U]: Map[T, U]

    [use case] Converts this general sequence to a map.

    [use case]

    Converts this general sequence 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 general sequence.

    Definition Classes
    GenTraversableOnce
  58. def toString(): String

    Creates a String representation of this object.

    Creates a String representation of this object. The default representation is platform dependent. On the java platform it is the concatenation of the class name, "@", and the object's hashcode in hexadecimal.

    returns

    a String representation of the object.

    Definition Classes
    AnyRef → Any
  59. abstract def union(that: GenSeq[A]): GenSeq[A]

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

    [use case]

    Produces a new sequence which contains all elements of this general sequence 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 general sequence followed by all elements of that.

  60. def union[B >: A, That](that: GenSeq[B])(implicit bf: CanBuildFrom[Repr, B, That]): That

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

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

    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 and the new element type B.

    returns

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

  61. abstract def updated(index: Int, elem: A): GenSeq[A]

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

    [use case]

    A copy of this general sequence with one single replaced element.

    index

    the position of the replacement

    elem

    the replacing element

    returns

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

  62. final def wait(): Unit

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

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

    Definition Classes
    AnyRef
    Annotations
    @throws()
  65. abstract def zip[B](that: GenIterable[B]): GenSeq[(A, B)]

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

    [use case]

    Returns a general sequence formed from this general sequence and another iterable collection by combining corresponding elements in pairs. If one of the two collections is longer than the other, its remaining elements are ignored.

    B

    the type of the second half of the returned pairs

    that

    The iterable providing the second half of each result pair

    returns

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

    Definition Classes
    GenIterableLike
  66. abstract def zipAll[B](that: Iterable[B], thisElem: A, thatElem: B): GenSeq[(A, B)]

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

    [use case]

    Returns a general sequence formed from this general sequence 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 general sequence is shorter than that.

    thatElem

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

    returns

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

    Definition Classes
    GenIterableLike
  67. abstract def zipWithIndex: GenSeq[(A, Int)]

    [use case] Zips this general sequence with its indices.

    [use case]

    Zips this general sequence with its indices.

    returns

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

    Definition Classes
    GenIterableLike

Inherited from Equals

Inherited from GenIterableLike[A, Repr]

Inherited from GenTraversableLike[A, Repr]

Inherited from Parallelizable[A, ParSeq[A]]

Inherited from GenTraversableOnce[A]

Inherited from AnyRef

Inherited from Any