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trait Seq[+A] extends Iterable[A] with PartialFunction[Int, A] with SeqOps[A, Seq, Seq[A]] with IterableFactoryDefaults[A, Seq] with Equals

Base trait for sequence collections

A

the element type of the collection

Source
Seq.scala
Linear Supertypes
Equals, SeqOps[A, Seq, Seq[A]], PartialFunction[Int, A], (Int) => A, Iterable[A], IterableFactoryDefaults[A, [x]Seq[x]], IterableOps[A, [_]Seq[_], Seq[A]], IterableOnceOps[A, [_]Seq[_], Seq[A]], IterableOnce[A], AnyRef, Any
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Inherited
  1. Seq
  2. Equals
  3. SeqOps
  4. PartialFunction
  5. Function1
  6. Iterable
  7. IterableFactoryDefaults
  8. IterableOps
  9. IterableOnceOps
  10. IterableOnce
  11. AnyRef
  12. Any
Implicitly
  1. by UnliftOps
  2. by iterableOnceExtensionMethods
  3. by any2stringadd
  4. by StringFormat
  5. by Ensuring
  6. by ArrowAssoc
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Visibility
  1. Public
  2. Protected

Abstract Value Members

  1. abstract def apply(i: Int): A

    Get the element at the specified index.

    Get the element at the specified index. This operation is provided for convenience in Seq. It should not be assumed to be efficient unless you have an IndexedSeq.

    Definition Classes
    SeqOps
    Annotations
    @throws(cause = scala.this.throws.<init>$default$1[IndexOutOfBoundsException])
  2. abstract def iterator: Iterator[A]

    Iterator can be used only once

    Iterator can be used only once

    Definition Classes
    IterableOnce
  3. abstract def length: Int

    The length (number of elements) of the sequence.

    The length (number of elements) of the sequence. size is an alias for length in Seq collections.

    Definition Classes
    SeqOps

Concrete Value Members

  1. final def ++[B >: A](suffix: IterableOnce[B]): Seq[B]

    Alias for concat

    Alias for concat

    Definition Classes
    IterableOps
    Annotations
    @inline()
  2. final def ++:[B >: A](prefix: IterableOnce[B]): Seq[B]

    Alias for prependedAll

    Alias for prependedAll

    Definition Classes
    SeqOpsIterableOps
    Annotations
    @inline()
  3. final def +:[B >: A](elem: B): Seq[B]

    Alias for prepended.

    Alias for prepended.

    Note that :-ending operators are right associative (see example). A mnemonic for +: vs. :+ is: the COLon goes on the COLlection side.

    Definition Classes
    SeqOps
    Annotations
    @inline()
  4. final def :+[B >: A](elem: B): Seq[B]

    Alias for appended

    Alias for appended

    Note that :-ending operators are right associative (see example). A mnemonic for +: vs. :+ is: the COLon goes on the COLlection side.

    Definition Classes
    SeqOps
    Annotations
    @inline()
  5. final def :++[B >: A](suffix: IterableOnce[B]): Seq[B]

    Alias for appendedAll

    Alias for appendedAll

    Definition Classes
    SeqOps
    Annotations
    @inline()
  6. final def addString(b: mutable.StringBuilder): b.type

    Appends all elements of this sequence to a string builder.

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

    Example:

    scala> val a = List(1,2,3,4)
    a: List[Int] = List(1, 2, 3, 4)
    
    scala> val b = new StringBuilder()
    b: StringBuilder =
    
    scala> val h = a.addString(b)
    h: StringBuilder = 1234
    b

    the string builder to which elements are appended.

    returns

    the string builder b to which elements were appended.

    Definition Classes
    IterableOnceOps
    Annotations
    @inline()
  7. final def addString(b: mutable.StringBuilder, sep: String): b.type

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

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

    Example:

    scala> val a = List(1,2,3,4)
    a: List[Int] = List(1, 2, 3, 4)
    
    scala> val b = new StringBuilder()
    b: StringBuilder =
    
    scala> a.addString(b, ", ")
    res0: StringBuilder = 1, 2, 3, 4
    b

    the string builder to which elements are appended.

    sep

    the separator string.

    returns

    the string builder b to which elements were appended.

    Definition Classes
    IterableOnceOps
    Annotations
    @inline()
  8. def addString(b: mutable.StringBuilder, start: String, sep: String, end: String): b.type

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

    Appends all elements of this sequence to a string builder using start, end, and separator strings. The written text begins with the string start and ends with the string end. Inside, the string representations (w.r.t. the method toString) of all elements of this sequence are separated by the string sep.

    Example:

    scala> val a = List(1,2,3,4)
    a: List[Int] = List(1, 2, 3, 4)
    
    scala> val b = new StringBuilder()
    b: StringBuilder =
    
    scala> a.addString(b , "List(" , ", " , ")")
    res5: StringBuilder = List(1, 2, 3, 4)
    b

    the string builder to which elements are appended.

    start

    the starting string.

    sep

    the separator string.

    end

    the ending string.

    returns

    the string builder b to which elements were appended.

    Definition Classes
    IterableOnceOps
  9. def andThen[C](k: PartialFunction[A, C]): PartialFunction[Int, C]

    Composes this partial function with another partial function that gets applied to results of this partial function.

    Composes this partial function with another partial function that gets applied to results of this partial function.

    Note that calling isDefinedAt on the resulting partial function may apply the first partial function and execute its side effect. For efficiency, it is recommended to call applyOrElse instead of isDefinedAt or apply.

    C

    the result type of the transformation function.

    k

    the transformation function

    returns

    a partial function with the domain of this partial function narrowed by other partial function, which maps arguments x to k(this(x)).

    Definition Classes
    PartialFunction
  10. 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.

    If the runtime type of the function is a PartialFunction then the other andThen method is used (note its cautions).

    C

    the result type of the transformation function.

    k

    the transformation function

    returns

    a partial function with the domain of this partial function, possibly narrowed by the specified function, which maps arguments x to k(this(x)).

    Definition Classes
    PartialFunctionFunction1
  11. def appended[B >: A](elem: B): Seq[B]

    A copy of this sequence with an element appended.

    A copy of this sequence with an element appended.

    Note: will not terminate for infinite-sized collections.

    Example:

    scala> val a = List(1)
    a: List[Int] = List(1)
    
    scala> val b = a :+ 2
    b: List[Int] = List(1, 2)
    
    scala> println(a)
    List(1)
    B

    the element type of the returned sequence.

    elem

    the appended element

    returns

    a new sequence consisting of all elements of this sequence followed by value.

    Definition Classes
    SeqOps
  12. def appendedAll[B >: A](suffix: IterableOnce[B]): Seq[B]

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

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

    B

    the element type of the returned collection.

    suffix

    the iterable to append.

    returns

    a new collection of type CC[B] which contains all elements of this sequence followed by all elements of suffix.

    Definition Classes
    SeqOps
  13. def applyOrElse[A1 <: Int, B1 >: A](x: A1, default: (A1) => B1): B1

    Applies this partial function to the given argument when it is contained in the function domain.

    Applies this partial function to the given argument when it is contained in the function domain. Applies fallback function where this partial function is not defined.

    Note that expression pf.applyOrElse(x, default) is equivalent to

    if(pf isDefinedAt x) pf(x) else default(x)

    except that applyOrElse method can be implemented more efficiently. For all partial function literals the compiler generates an applyOrElse implementation which avoids double evaluation of pattern matchers and guards. This makes applyOrElse the basis for the efficient implementation for many operations and scenarios, such as:

    • combining partial functions into orElse/andThen chains does not lead to excessive apply/isDefinedAt evaluation
    • lift and unlift do not evaluate source functions twice on each invocation
    • runWith allows efficient imperative-style combining of partial functions with conditionally applied actions

    For non-literal partial function classes with nontrivial isDefinedAt method it is recommended to override applyOrElse with custom implementation that avoids double isDefinedAt evaluation. This may result in better performance and more predictable behavior w.r.t. side effects.

    x

    the function argument

    default

    the fallback function

    returns

    the result of this function or fallback function application.

    Definition Classes
    PartialFunction
  14. 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
    SeqEquals
  15. def collect[B](pf: PartialFunction[A, B]): Seq[B]

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

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

    B

    the element type of the returned sequence.

    pf

    the partial function which filters and maps the sequence.

    returns

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

    Definition Classes
    IterableOpsIterableOnceOps
  16. def collectFirst[B](pf: PartialFunction[A, B]): Option[B]

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

    Finds the first element of the sequence 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
    IterableOnceOps
    Example:
    1. Seq("a", 1, 5L).collectFirst({ case x: Int => x*10 }) = Some(10)

  17. def combinations(n: Int): Iterator[Seq[A]]

    Iterates over combinations of elements.

    Iterates over combinations of elements.

    A combination of length n is a sequence of n elements selected in order of their first index in this sequence.

    For example, "xyx" has two combinations of length 2. The x is selected first: "xx", "xy". The sequence "yx" is not returned as a combination because it is subsumed by "xy".

    If there is more than one way to generate the same combination, only one will be returned.

    For example, the result "xy" arbitrarily selected one of the x elements.

    As a further illustration, "xyxx" has three different ways to generate "xy" because there are three elements x to choose from. Moreover, there are three unordered pairs "xx" but only one is returned.

    It is not specified which of these equal combinations is returned. It is an implementation detail that should not be relied on. For example, the combination "xx" does not necessarily contain the first x in this sequence. This behavior is observable if the elements compare equal but are not identical.

    As a consequence, "xyx".combinations(3).next() is "xxy": the combination does not reflect the order of the original sequence, but the order in which elements were selected, by "first index"; the order of each x element is also arbitrary.

    Note: Even when applied to a view or a lazy collection it will always force the elements.

    returns

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

    Definition Classes
    SeqOps
    Example:
    1. Seq('a', 'b', 'b', 'b', 'c').combinations(2).foreach(println)
      // List(a, b)
      // List(a, c)
      // List(b, b)
      // List(b, c)
      Seq('b', 'a', 'b').combinations(2).foreach(println)
      // List(b, b)
      // List(b, a)
  18. def compose[R](k: PartialFunction[R, Int]): PartialFunction[R, A]

    Composes another partial function k with this partial function so that this partial function gets applied to results of k.

    Composes another partial function k with this partial function so that this partial function gets applied to results of k.

    Note that calling isDefinedAt on the resulting partial function may apply the first partial function and execute its side effect. For efficiency, it is recommended to call applyOrElse instead of isDefinedAt or apply.

    R

    the parameter type of the transformation function.

    k

    the transformation function

    returns

    a partial function with the domain of other partial function narrowed by this partial function, which maps arguments x to this(k(x)).

    Definition Classes
    PartialFunction
  19. 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
    Annotations
    @unspecialized()
  20. final def concat[B >: A](suffix: IterableOnce[B]): Seq[B]

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

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

    B

    the element type of the returned collection.

    suffix

    the iterable to append.

    returns

    a new sequence which contains all elements of this sequence followed by all elements of suffix.

    Definition Classes
    SeqOpsIterableOps
    Annotations
    @inline()
  21. def contains[A1 >: A](elem: A1): Boolean

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

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

    Note: may not terminate for infinite-sized collections.

    elem

    the element to test.

    returns

    true if this sequence has an element that is equal (as determined by ==) to elem, false otherwise.

    Definition Classes
    SeqOps
  22. def containsSlice[B >: A](that: Seq[B]): Boolean

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

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

    Note: may not terminate for infinite-sized collections.

    that

    the sequence to test

    returns

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

    Definition Classes
    SeqOps
  23. def copyToArray[B >: A](xs: Array[B], start: Int, len: Int): Int

    Copy elements to an array, returning the number of elements written.

    Copy elements to an array, returning the number of elements written.

    Fills the given array xs starting at index start with at most len elements of this sequence.

    Copying will stop once either all the elements of this sequence have been copied, or the end of the array is reached, or len elements have been copied.

    B

    the type of the elements of the array.

    xs

    the array to fill.

    start

    the starting index of xs.

    len

    the maximal number of elements to copy.

    returns

    the number of elements written to the array

    Definition Classes
    IterableOnceOps
    Note

    Reuse: After calling this method, one should discard the iterator it was called on. Using it is undefined and subject to change.

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

    Copy elements to an array, returning the number of elements written.

    Copy elements to an array, returning the number of elements written.

    Fills the given array xs starting at index start with values of this sequence.

    Copying will stop once either all the elements of this sequence have been copied, or the end of the array is reached.

    B

    the type of the elements of the array.

    xs

    the array to fill.

    start

    the starting index of xs.

    returns

    the number of elements written to the array

    Definition Classes
    IterableOnceOps
    Annotations
    @deprecatedOverriding()
    Note

    Reuse: After calling this method, one should discard the iterator it was called on. Using it is undefined and subject to change.

  25. def copyToArray[B >: A](xs: Array[B]): Int

    Copy elements to an array, returning the number of elements written.

    Copy elements to an array, returning the number of elements written.

    Fills the given array xs starting at index start with values of this sequence.

    Copying will stop once either all the elements of this sequence have been copied, or the end of the array is reached.

    B

    the type of the elements of the array.

    xs

    the array to fill.

    returns

    the number of elements written to the array

    Definition Classes
    IterableOnceOps
    Annotations
    @deprecatedOverriding()
    Note

    Reuse: After calling this method, one should discard the iterator it was called on. Using it is undefined and subject to change.

  26. def corresponds[B](that: Seq[B])(p: (A, B) => Boolean): Boolean

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

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

    Definition Classes
    SeqOps
  27. def corresponds[B](that: IterableOnce[B])(p: (A, B) => Boolean): Boolean

    Tests whether every element of this collection's iterator relates to the corresponding element of another collection by satisfying a test predicate.

    Tests whether every element of this collection's iterator relates to the corresponding element of another collection by satisfying a test predicate.

    Note: will not terminate for infinite-sized collections.

    B

    the type of the elements of that

    that

    the other collection

    p

    the test predicate, which relates elements from both collections

    returns

    true if both collections have the same length and p(x, y) is true for all corresponding elements x of this iterator and y of that, otherwise false

    Definition Classes
    IterableOnceOps
  28. def count(p: (A) => Boolean): Int

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

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

    Note: will not terminate for infinite-sized collections.

    p

    the predicate used to test elements.

    returns

    the number of elements satisfying the predicate p.

    Definition Classes
    IterableOnceOps
  29. def diff[B >: A](that: Seq[B]): Seq[A]

    Computes the multiset difference between this sequence and another sequence.

    Computes the multiset difference between this sequence and another sequence.

    that

    the sequence of elements to remove

    returns

    a new sequence which contains all elements of this 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.

    Definition Classes
    SeqOps
  30. def distinct: Seq[A]

    Selects all the elements of this sequence ignoring the duplicates.

    Selects all the elements of this sequence ignoring the duplicates.

    returns

    a new sequence consisting of all the elements of this sequence without duplicates.

    Definition Classes
    SeqOps
  31. def distinctBy[B](f: (A) => B): Seq[A]

    Selects all the elements of this sequence ignoring the duplicates as determined by == after applying the transforming function f.

    Selects all the elements of this sequence ignoring the duplicates as determined by == after applying the transforming function f.

    B

    the type of the elements after being transformed by f

    f

    The transforming function whose result is used to determine the uniqueness of each element

    returns

    a new sequence consisting of all the elements of this sequence without duplicates.

    Definition Classes
    SeqOps
  32. def drop(n: Int): Seq[A]

    Selects all elements except first n ones.

    Selects all elements except first n ones.

    n

    the number of elements to drop from this sequence.

    returns

    a sequence consisting of all elements of this sequence except the first n ones, or else the empty sequence, if this sequence has less than n elements. If n is negative, don't drop any elements.

    Definition Classes
    IterableOpsIterableOnceOps
  33. def dropRight(n: Int): Seq[A]

    Selects all elements except last n ones.

    Selects all elements except last n ones.

    n

    the number of elements to drop from this sequence.

    returns

    a sequence consisting of all elements of this sequence except the last n ones, or else the empty sequence, if this sequence has less than n elements. If n is negative, don't drop any elements.

    Definition Classes
    IterableOps
  34. def dropWhile(p: (A) => Boolean): Seq[A]

    Drops longest prefix of elements that satisfy a predicate.

    Drops longest prefix of elements that satisfy a predicate.

    p

    The predicate used to test elements.

    returns

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

    Definition Classes
    IterableOpsIterableOnceOps
  35. def elementWise: ElementWiseExtractor[Int, A]

    Returns an extractor object with a unapplySeq method, which extracts each element of a sequence data.

    Returns an extractor object with a unapplySeq method, which extracts each element of a sequence data.

    Definition Classes
    PartialFunction
    Example:
    1. val firstChar: String => Option[Char] = _.headOption
      
      Seq("foo", "bar", "baz") match {
        case firstChar.unlift.elementWise(c0, c1, c2) =>
          println(s"$c0, $c1, $c2") // Output: f, b, b
      }
  36. def empty: Seq[A]

    The empty iterable of the same type as this iterable

    The empty iterable of the same type as this iterable

    returns

    an empty iterable of type C.

    Definition Classes
    IterableFactoryDefaultsIterableOps
  37. def endsWith[B >: A](that: Iterable[B]): Boolean

    Tests whether this sequence ends with the given sequence.

    Tests whether this sequence ends with the given sequence.

    Note: will not terminate for infinite-sized collections.

    that

    the sequence to test

    returns

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

    Definition Classes
    SeqOps
  38. def equals(o: Any): Boolean

    The universal equality method defined in AnyRef.

    The universal equality method defined in AnyRef.

    Definition Classes
    SeqEquals → AnyRef → Any
  39. def exists(p: (A) => Boolean): Boolean

    Tests whether a predicate holds for at least one element of this sequence.

    Tests whether a predicate holds for at least one element of this sequence.

    Note: may not terminate for infinite-sized collections.

    p

    the predicate used to test elements.

    returns

    true if the given predicate p is satisfied by at least one element of this sequence, otherwise false

    Definition Classes
    IterableOnceOps
  40. def filter(pred: (A) => Boolean): Seq[A]

    Selects all elements of this sequence which satisfy a predicate.

    Selects all elements of this sequence which satisfy a predicate.

    returns

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

    Definition Classes
    IterableOpsIterableOnceOps
  41. def filterNot(pred: (A) => Boolean): Seq[A]

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

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

    pred

    the predicate used to test elements.

    returns

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

    Definition Classes
    IterableOpsIterableOnceOps
  42. def find(p: (A) => Boolean): Option[A]

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

    Finds the first element of the sequence 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 sequence that satisfies p, or None if none exists.

    Definition Classes
    IterableOnceOps
  43. def findLast(p: (A) => Boolean): Option[A]

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

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

    Note: will not terminate for infinite-sized collections.

    p

    the predicate used to test elements.

    returns

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

    Definition Classes
    SeqOps
  44. def flatMap[B](f: (A) => IterableOnce[B]): Seq[B]

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

    Builds a new sequence by applying a function to all elements of this 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 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: String) => word.toSeq)
    
    // xs will be 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.

    f

    the function to apply to each element.

    returns

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

    Definition Classes
    IterableOpsIterableOnceOps
  45. def flatten[B](implicit asIterable: (A) => IterableOnce[B]): Seq[B]

    Converts this sequence of iterable collections into a sequence formed by the elements of these iterable collections.

    Converts this sequence of iterable collections into a sequence formed by the elements of these iterable collections.

    The resulting collection's type will be guided by the type of sequence. For example:

    val xs = List(
               Set(1, 2, 3),
               Set(1, 2, 3)
             ).flatten
    // xs == List(1, 2, 3, 1, 2, 3)
    
    val ys = Set(
               List(1, 2, 3),
               List(3, 2, 1)
             ).flatten
    // ys == Set(1, 2, 3)
    B

    the type of the elements of each iterable collection.

    asIterable

    an implicit conversion which asserts that the element type of this sequence is an Iterable.

    returns

    a new sequence resulting from concatenating all element sequences.

    Definition Classes
    IterableOpsIterableOnceOps
  46. 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 default implementation in IterableOnce is equivalent to foldLeft but may be overridden for more efficient traversal orders.

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

    Note: will not terminate for infinite-sized collections.

    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 the fold operator op between all the elements and z, or z if this sequence is empty.

    Definition Classes
    IterableOnceOps
  47. def foldLeft[B](z: B)(op: (B, A) => B): B

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

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

    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 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 sequence. Returns z if this sequence is empty.

    Definition Classes
    IterableOnceOps
  48. def foldRight[B](z: B)(op: (A, B) => B): B

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

    Applies a binary operator to all elements of this sequence 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.

    op

    the binary operator.

    returns

    the result of inserting op between consecutive elements of this 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 sequence. Returns z if this sequence is empty.

    Definition Classes
    IterableOnceOps
  49. def forall(p: (A) => Boolean): Boolean

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

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

    Note: may not terminate for infinite-sized collections.

    p

    the predicate used to test elements.

    returns

    true if this sequence is empty or the given predicate p holds for all elements of this sequence, otherwise false.

    Definition Classes
    IterableOnceOps
  50. def foreach[U](f: (A) => U): Unit

    Apply f to each element for its side effects Note: [U] parameter needed to help scalac's type inference.

    Apply f to each element for its side effects Note: [U] parameter needed to help scalac's type inference.

    Definition Classes
    IterableOnceOps
  51. def groupBy[K](f: (A) => K): immutable.Map[K, Seq[A]]

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

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

    Note: Even when applied to a view or a lazy collection it will always force the elements.

    K

    the type of keys returned by the discriminator function.

    f

    the discriminator function.

    returns

    A map from keys to sequences such that the following invariant holds:

    (xs groupBy f)(k) = xs filter (x => f(x) == k)

    That is, every key k is bound to a sequence of those elements x for which f(x) equals k.

    Definition Classes
    IterableOps
  52. def groupMap[K, B](key: (A) => K)(f: (A) => B): immutable.Map[K, Seq[B]]

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

    Partitions this sequence into a map of sequences according to a discriminator function key. Each element in a group is transformed into a value of type B using the value function.

    It is equivalent to groupBy(key).mapValues(_.map(f)), but more efficient.

    case class User(name: String, age: Int)
    
    def namesByAge(users: Seq[User]): Map[Int, Seq[String]] =
      users.groupMap(_.age)(_.name)

    Note: Even when applied to a view or a lazy collection it will always force the elements.

    K

    the type of keys returned by the discriminator function

    B

    the type of values returned by the transformation function

    key

    the discriminator function

    f

    the element transformation function

    Definition Classes
    IterableOps
  53. def groupMapReduce[K, B](key: (A) => K)(f: (A) => B)(reduce: (B, B) => B): immutable.Map[K, B]

    Partitions this sequence into a map according to a discriminator function key.

    Partitions this sequence into a map according to a discriminator function key. All the values that have the same discriminator are then transformed by the f function and then reduced into a single value with the reduce function.

    It is equivalent to groupBy(key).mapValues(_.map(f).reduce(reduce)), but more efficient.

    def occurrences[A](as: Seq[A]): Map[A, Int] =
      as.groupMapReduce(identity)(_ => 1)(_ + _)

    Note: Even when applied to a view or a lazy collection it will always force the elements.

    Definition Classes
    IterableOps
  54. def grouped(size: Int): Iterator[Seq[A]]

    Partitions elements in fixed size sequences.

    Partitions elements in fixed size sequences.

    size

    the number of elements per group

    returns

    An iterator producing sequences of size size, except the last will be less than size size if the elements don't divide evenly.

    Definition Classes
    IterableOps
    See also

    scala.collection.Iterator, method grouped

  55. def hashCode(): Int

    The hashCode method for reference types.

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

    returns

    the hash code value for this object.

    Definition Classes
    Seq → AnyRef → Any
  56. def head: A

    Selects the first element of this sequence.

    Selects the first element of this sequence.

    returns

    the first element of this sequence.

    Definition Classes
    IterableOps
    Exceptions thrown

    NoSuchElementException if the sequence is empty.

  57. def headOption: Option[A]

    Optionally selects the first element.

    Optionally selects the first element.

    returns

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

    Definition Classes
    IterableOps
  58. def indexOf[B >: A](elem: B): Int

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

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

    B

    the type of the element elem.

    elem

    the element value to search for.

    returns

    the index >= 0 of the first element of this sequence that is equal (as determined by ==) to elem, or -1, if none exists.

    Definition Classes
    SeqOps
    Annotations
    @deprecatedOverriding()
  59. def indexOf[B >: A](elem: B, from: Int): Int

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

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

    B

    the type of the element elem.

    elem

    the element value to search for.

    from

    the start index

    returns

    the index >= from of the first element of this sequence that is equal (as determined by ==) to elem, or -1, if none exists.

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

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

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

    Note: may not terminate for infinite-sized collections.

    that

    the sequence to test

    returns

    the first index >= 0 such that the elements of this sequence starting at this index match the elements of sequence that, or -1 if no such subsequence exists.

    Definition Classes
    SeqOps
    Annotations
    @deprecatedOverriding()
  61. def indexOfSlice[B >: A](that: Seq[B], from: Int): Int

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

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

    Definition Classes
    SeqOps
  62. def indexWhere(p: (A) => Boolean): Int

    Finds index of the first element satisfying some predicate.

    Finds index of the first element satisfying some predicate.

    Note: may not terminate for infinite-sized collections.

    p

    the predicate used to test elements.

    returns

    the index >= 0 of the first element of this sequence that satisfies the predicate p, or -1, if none exists.

    Definition Classes
    SeqOps
    Annotations
    @deprecatedOverriding()
  63. 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 sequence that satisfies the predicate p, or -1, if none exists.

    Definition Classes
    SeqOps
  64. def indices: immutable.Range

    Produces the range of all indices of this sequence.

    Produces the range of all indices of this sequence.

    Note: Even when applied to a view or a lazy collection it will always force the elements.

    returns

    a Range value from 0 to one less than the length of this sequence.

    Definition Classes
    SeqOps
  65. def init: Seq[A]

    The initial part of the collection without its last element.

    The initial part of the collection without its last element.

    Note: Even when applied to a view or a lazy collection it will always force the elements.

    Definition Classes
    IterableOps
  66. def inits: Iterator[Seq[A]]

    Iterates over the inits of this sequence.

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

    Note: Even when applied to a view or a lazy collection it will always force the elements.

    returns

    an iterator over all the inits of this sequence

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

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

    Computes the multiset intersection between this sequence and another sequence.

    Computes the multiset intersection between this sequence and another sequence.

    that

    the sequence of elements to intersect with.

    returns

    a new sequence which contains all elements of this 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.

    Definition Classes
    SeqOps
  68. def isDefinedAt(idx: Int): Boolean

    Tests whether this sequence contains given index.

    Tests whether this 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 sequence contains an element at position idx, false otherwise.

    Definition Classes
    SeqOps
  69. def isEmpty: Boolean

    Tests whether the sequence is empty.

    Tests whether the sequence is empty.

    Note: The default implementation creates and discards an iterator.

    Note: Implementations in subclasses that are not repeatedly iterable must take care not to consume any elements when isEmpty is called.

    returns

    true if the sequence contains no elements, false otherwise.

    Definition Classes
    SeqOpsIterableOnceOps
  70. def isTraversableAgain: Boolean

    Tests whether this sequence can be repeatedly traversed.

    Tests whether this sequence can be repeatedly traversed. Always true for Iterables and false for Iterators unless overridden.

    returns

    true if it is repeatedly traversable, false otherwise.

    Definition Classes
    IterableOpsIterableOnceOps
  71. def iterableFactory: SeqFactory[Seq]

    The companion object of this sequence, providing various factory methods.

    The companion object of this sequence, providing various factory methods.

    Definition Classes
    SeqIterableIterableOps
    Note

    When implementing a custom collection type and refining CC to the new type, this method needs to be overridden to return a factory for the new type (the compiler will issue an error otherwise).

  72. def knownSize: Int

    returns

    The number of elements in this sequence, if it can be cheaply computed, -1 otherwise. Cheaply usually means: Not requiring a collection traversal.

    Definition Classes
    IterableOnce
  73. def last: A

    Selects the last element.

    Selects the last element.

    returns

    The last element of this sequence.

    Definition Classes
    IterableOps
    Exceptions thrown

    NoSuchElementException If the sequence is empty.

  74. def lastIndexOf[B >: A](elem: B, end: Int = length - 1): Int

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

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

    Note: will not terminate for infinite-sized collections.

    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 sequence that is equal (as determined by ==) to elem, or -1, if none exists.

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

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

    Finds last index where this sequence 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 sequence starting at this index match the elements of sequence that, or -1 if no such subsequence exists.

    Definition Classes
    SeqOps
    Annotations
    @deprecatedOverriding()
  76. def lastIndexOfSlice[B >: A](that: Seq[B], end: Int): Int

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

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

    Note: will not terminate for infinite-sized collections.

    that

    the sequence to test

    end

    the end index

    returns

    the last index <= end such that the elements of this sequence starting at this index match the elements of sequence that, or -1 if no such subsequence exists.

    Definition Classes
    SeqOps
  77. 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 sequence that satisfies the predicate p, or -1, if none exists.

    Definition Classes
    SeqOps
    Annotations
    @deprecatedOverriding()
  78. 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.

    Note: will not terminate for infinite-sized collections.

    p

    the predicate used to test elements.

    returns

    the index <= end of the last element of this sequence that satisfies the predicate p, or -1, if none exists.

    Definition Classes
    SeqOps
  79. def lastOption: Option[A]

    Optionally selects the last element.

    Optionally selects the last element.

    returns

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

    Definition Classes
    IterableOps
  80. def lazyZip[B](that: Iterable[B]): LazyZip2[A, B, Seq.this.type]

    Analogous to zip except that the elements in each collection are not consumed until a strict operation is invoked on the returned LazyZip2 decorator.

    Analogous to zip except that the elements in each collection are not consumed until a strict operation is invoked on the returned LazyZip2 decorator.

    Calls to lazyZip can be chained to support higher arities (up to 4) without incurring the expense of constructing and deconstructing intermediary tuples.

    val xs = List(1, 2, 3)
    val res = (xs lazyZip xs lazyZip xs lazyZip xs).map((a, b, c, d) => a + b + c + d)
    // res == List(4, 8, 12)
    B

    the type of the second element in each eventual pair

    that

    the iterable providing the second element of each eventual pair

    returns

    a decorator LazyZip2 that allows strict operations to be performed on the lazily evaluated pairs or chained calls to lazyZip. Implicit conversion to Iterable[(A, B)] is also supported.

    Definition Classes
    Iterable
  81. def lengthCompare(that: Iterable[_]): Int

    Compares the length of this sequence to the size of another Iterable.

    Compares the length of this sequence to the size of another Iterable.

    that

    the Iterable whose size is compared with this sequence's length.

    returns

    A value x where

    x <  0       if this.length <  that.size
    x == 0       if this.length == that.size
    x >  0       if this.length >  that.size

    The method as implemented here does not call length or size directly; its running time is O(this.length min that.size) instead of O(this.length + that.size). The method should be overridden if computing size is cheap and knownSize returns -1.

    Definition Classes
    SeqOps
  82. def lengthCompare(len: Int): Int

    Compares the length of this sequence to a test value.

    Compares the length of this sequence 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 overridden if computing length is cheap and knownSize returns -1.

    Definition Classes
    SeqOps
    See also

    lengthIs

  83. final def lengthIs: SizeCompareOps

    Returns a value class containing operations for comparing the length of this sequence to a test value.

    Returns a value class containing operations for comparing the length of this sequence to a test value.

    These operations are implemented in terms of lengthCompare(Int), and allow the following more readable usages:

    this.lengthIs < len     // this.lengthCompare(len) < 0
    this.lengthIs <= len    // this.lengthCompare(len) <= 0
    this.lengthIs == len    // this.lengthCompare(len) == 0
    this.lengthIs != len    // this.lengthCompare(len) != 0
    this.lengthIs >= len    // this.lengthCompare(len) >= 0
    this.lengthIs > len     // this.lengthCompare(len) > 0
    Definition Classes
    SeqOps
    Annotations
    @inline()
  84. def lift: (Int) => Option[A]

    Turns this partial function into a plain function returning an Option result.

    Turns this partial function into a 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

  85. def map[B](f: (A) => B): Seq[B]

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

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

    B

    the element type of the returned sequence.

    f

    the function to apply to each element.

    returns

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

    Definition Classes
    IterableOpsIterableOnceOps
  86. def max[B >: A](implicit ord: math.Ordering[B]): A

    Finds the largest element.

    Finds the largest element.

    Note: will not terminate for infinite-sized collections.

    B

    The type over which the ordering is defined.

    ord

    An ordering to be used for comparing elements.

    returns

    the largest element of this sequence with respect to the ordering ord.

    Definition Classes
    IterableOnceOps
    Exceptions thrown

    UnsupportedOperationException if this sequence is empty.

  87. def maxBy[B](f: (A) => B)(implicit ord: math.Ordering[B]): A

    Finds the first element which yields the largest value measured by function f.

    Finds the first element which yields the largest value measured by function f.

    Note: will not terminate for infinite-sized collections.

    B

    The result type of the function f.

    f

    The measuring function.

    returns

    the first element of this sequence with the largest value measured by function f with respect to the ordering cmp.

    Definition Classes
    IterableOnceOps
    Exceptions thrown

    UnsupportedOperationException if this sequence is empty.

  88. def maxByOption[B](f: (A) => B)(implicit ord: math.Ordering[B]): Option[A]

    Finds the first element which yields the largest value measured by function f.

    Finds the first element which yields the largest value measured by function f.

    Note: will not terminate for infinite-sized collections.

    B

    The result type of the function f.

    f

    The measuring function.

    returns

    an option value containing the first element of this sequence with the largest value measured by function f with respect to the ordering cmp.

    Definition Classes
    IterableOnceOps
  89. def maxOption[B >: A](implicit ord: math.Ordering[B]): Option[A]

    Finds the largest element.

    Finds the largest element.

    Note: will not terminate for infinite-sized collections.

    B

    The type over which the ordering is defined.

    ord

    An ordering to be used for comparing elements.

    returns

    an option value containing the largest element of this sequence with respect to the ordering ord.

    Definition Classes
    IterableOnceOps
  90. def min[B >: A](implicit ord: math.Ordering[B]): A

    Finds the smallest element.

    Finds the smallest element.

    Note: will not terminate for infinite-sized collections.

    B

    The type over which the ordering is defined.

    ord

    An ordering to be used for comparing elements.

    returns

    the smallest element of this sequence with respect to the ordering ord.

    Definition Classes
    IterableOnceOps
    Exceptions thrown

    UnsupportedOperationException if this sequence is empty.

  91. def minBy[B](f: (A) => B)(implicit ord: math.Ordering[B]): A

    Finds the first element which yields the smallest value measured by function f.

    Finds the first element which yields the smallest value measured by function f.

    Note: will not terminate for infinite-sized collections.

    B

    The result type of the function f.

    f

    The measuring function.

    returns

    the first element of this sequence with the smallest value measured by function f with respect to the ordering cmp.

    Definition Classes
    IterableOnceOps
    Exceptions thrown

    UnsupportedOperationException if this sequence is empty.

  92. def minByOption[B](f: (A) => B)(implicit ord: math.Ordering[B]): Option[A]

    Finds the first element which yields the smallest value measured by function f.

    Finds the first element which yields the smallest value measured by function f.

    Note: will not terminate for infinite-sized collections.

    B

    The result type of the function f.

    f

    The measuring function.

    returns

    an option value containing the first element of this sequence with the smallest value measured by function f with respect to the ordering cmp.

    Definition Classes
    IterableOnceOps
  93. def minOption[B >: A](implicit ord: math.Ordering[B]): Option[A]

    Finds the smallest element.

    Finds the smallest element.

    Note: will not terminate for infinite-sized collections.

    B

    The type over which the ordering is defined.

    ord

    An ordering to be used for comparing elements.

    returns

    an option value containing the smallest element of this sequence with respect to the ordering ord.

    Definition Classes
    IterableOnceOps
  94. final def mkString: String

    Displays all elements of this sequence in a string.

    Displays all elements of this sequence in a string.

    Delegates to addString, which can be overridden.

    returns

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

    Definition Classes
    IterableOnceOps
    Annotations
    @inline()
  95. final def mkString(sep: String): String

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

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

    Delegates to addString, which can be overridden.

    sep

    the separator string.

    returns

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

    Definition Classes
    IterableOnceOps
    Annotations
    @inline()
    Example:
    1. List(1, 2, 3).mkString("|") = "1|2|3"

  96. final def mkString(start: String, sep: String, end: String): String

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

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

    Delegates to addString, which can be overridden.

    start

    the starting string.

    sep

    the separator string.

    end

    the ending string.

    returns

    a string representation of this 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 sequence are separated by the string sep.

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

  97. def nonEmpty: Boolean

    Tests whether the sequence is not empty.

    Tests whether the sequence is not empty.

    returns

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

    Definition Classes
    IterableOnceOps
    Annotations
    @deprecatedOverriding()
  98. 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
  99. def padTo[B >: A](len: Int, elem: B): Seq[B]

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

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

    B

    the element type of the returned sequence.

    len

    the target length

    elem

    the padding value

    returns

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

    Definition Classes
    SeqOps
  100. def partition(p: (A) => Boolean): (Seq[A], Seq[A])

    A pair of, first, all elements that satisfy predicate p and, second, all elements that do not.

    A pair of, first, all elements that satisfy predicate p and, second, all elements that do not. Interesting because it splits a collection in two.

    The default implementation provided here needs to traverse the collection twice. Strict collections have an overridden version of partition in StrictOptimizedIterableOps, which requires only a single traversal.

    Definition Classes
    IterableOps
  101. def partitionMap[A1, A2](f: (A) => Either[A1, A2]): (Seq[A1], Seq[A2])

    Applies a function f to each element of the sequence and returns a pair of sequences: the first one made of those values returned by f that were wrapped in scala.util.Left, and the second one made of those wrapped in scala.util.Right.

    Applies a function f to each element of the sequence and returns a pair of sequences: the first one made of those values returned by f that were wrapped in scala.util.Left, and the second one made of those wrapped in scala.util.Right.

    Example:

    val xs = `Seq`(1, "one", 2, "two", 3, "three") partitionMap {
     case i: Int => Left(i)
     case s: String => Right(s)
    }
    // xs == (`Seq`(1, 2, 3),
    //        `Seq`(one, two, three))
    A1

    the element type of the first resulting collection

    A2

    the element type of the second resulting collection

    f

    the 'split function' mapping the elements of this sequence to an scala.util.Either

    returns

    a pair of sequences: the first one made of those values returned by f that were wrapped in scala.util.Left, and the second one made of those wrapped in scala.util.Right.

    Definition Classes
    IterableOps
  102. def patch[B >: A](from: Int, other: IterableOnce[B], replaced: Int): Seq[B]

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

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

    Patching at negative indices is the same as patching starting at 0. Patching at indices at or larger than the length of the original sequence appends the patch to the end. If more values are replaced than actually exist, the excess is ignored.

    B

    the element type of the returned sequence.

    from

    the index of the first replaced element

    other

    the replacement sequence

    replaced

    the number of elements to drop in the original sequence

    returns

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

    Definition Classes
    SeqOps
  103. def permutations: Iterator[Seq[A]]

    Iterates over distinct permutations of elements.

    Iterates over distinct permutations of elements.

    Note: Even when applied to a view or a lazy collection it will always force the elements.

    returns

    An Iterator which traverses the distinct permutations of this sequence.

    Definition Classes
    SeqOps
    Example:
    1. Seq('a', 'b', 'b').permutations.foreach(println)
      // List(a, b, b)
      // List(b, a, b)
      // List(b, b, a)
  104. def prepended[B >: A](elem: B): Seq[B]

    A copy of the sequence with an element prepended.

    A copy of the sequence with an element prepended.

    Also, the original sequence is not modified, so you will want to capture the result.

    Example:

    scala> val x = List(1)
    x: List[Int] = List(1)
    
    scala> val y = 2 +: x
    y: List[Int] = List(2, 1)
    
    scala> println(x)
    List(1)
    B

    the element type of the returned sequence.

    elem

    the prepended element

    returns

    a new sequence consisting of value followed by all elements of this sequence.

    Definition Classes
    SeqOps
  105. def prependedAll[B >: A](prefix: IterableOnce[B]): Seq[B]

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

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

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

    B

    the element type of the returned collection.

    prefix

    the iterable to prepend.

    returns

    a new sequence which contains all elements of prefix followed by all the elements of this sequence.

    Definition Classes
    SeqOps
  106. def product[B >: A](implicit num: math.Numeric[B]): B

    Multiplies together the elements of this collection.

    Multiplies together the elements of this collection.

    The default implementation uses reduce for a known non-empty collection, foldLeft otherwise.

    Note: will not terminate for infinite-sized collections.

    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 sequence with respect to the * operator in num.

    Definition Classes
    IterableOnceOps
  107. def reduce[B >: A](op: (B, B) => B): B

    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.

    B

    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 sequence is nonempty.

    Definition Classes
    IterableOnceOps
    Exceptions thrown

    UnsupportedOperationException if this sequence is empty.

  108. def reduceLeft[B >: A](op: (B, A) => B): B

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

    Applies a binary operator to all elements of this sequence, 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

    the result of inserting op between consecutive elements of this sequence, going left to right: op( op( ... op(x1, x2) ..., xn-1), xn) where x1, ..., xn are the elements of this sequence.

    Definition Classes
    IterableOnceOps
    Exceptions thrown

    UnsupportedOperationException if this sequence is empty.

  109. def reduceLeftOption[B >: A](op: (B, A) => B): Option[B]

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

    Optionally applies a binary operator to all elements of this sequence, 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) if this sequence is nonempty, None otherwise.

    Definition Classes
    IterableOnceOps
  110. def reduceOption[B >: A](op: (B, B) => B): Option[B]

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

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

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

    B

    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
    IterableOnceOps
  111. def reduceRight[B >: A](op: (A, B) => B): B

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

    Applies a binary operator to all elements of this sequence, 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 sequence, going right to left: op(x1, op(x2, ..., op(xn-1, xn)...)) where x1, ..., xn are the elements of this sequence.

    Definition Classes
    IterableOnceOps
    Exceptions thrown

    UnsupportedOperationException if this sequence is empty.

  112. def reduceRightOption[B >: A](op: (A, B) => B): Option[B]

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

    Optionally applies a binary operator to all elements of this sequence, 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) if this sequence is nonempty, None otherwise.

    Definition Classes
    IterableOnceOps
  113. def reverse: Seq[A]

    Returns new sequence with elements in reversed order.

    Returns new sequence with elements in reversed order.

    Note: will not terminate for infinite-sized collections.

    Note: Even when applied to a view or a lazy collection it will always force the elements.

    returns

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

    Definition Classes
    SeqOps
  114. 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 sequence in reversed order

    Definition Classes
    SeqOps
  115. def runWith[U](action: (A) => U): (Int) => Boolean

    Composes this partial function with an action function which gets applied to results of this partial function.

    Composes this partial function with an action function which gets applied to results of this partial function. The action function is invoked only for its side effects; its result is ignored.

    Note that expression pf.runWith(action)(x) is equivalent to

    if(pf isDefinedAt x) { action(pf(x)); true } else false

    except that runWith is implemented via applyOrElse and thus potentially more efficient. Using runWith avoids double evaluation of pattern matchers and guards for partial function literals.

    action

    the action function

    returns

    a function which maps arguments x to isDefinedAt(x). The resulting function runs action(this(x)) where this is defined.

    Definition Classes
    PartialFunction
    See also

    applyOrElse.

  116. def sameElements[B >: A](that: IterableOnce[B]): Boolean

    Are the elements of this collection the same (and in the same order) as those of that?

    Are the elements of this collection the same (and in the same order) as those of that?

    Definition Classes
    SeqOps
  117. def scan[B >: A](z: B)(op: (B, B) => B): Seq[B]

    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

    z

    neutral element for the operator op

    op

    the associative operator for the scan

    returns

    a new sequence containing the prefix scan of the elements in this sequence

    Definition Classes
    IterableOps
  118. def scanLeft[B](z: B)(op: (B, A) => B): Seq[B]

    Produces a sequence containing cumulative results of applying the operator going left to right, including the initial value.

    Produces a sequence containing cumulative results of applying the operator going left to right, including the initial value.

    Note: will not terminate for infinite-sized collections.

    B

    the type of the elements in the resulting collection

    z

    the initial value

    op

    the binary operator applied to the intermediate result and the element

    returns

    collection with intermediate results

    Definition Classes
    IterableOpsIterableOnceOps
  119. def scanRight[B](z: B)(op: (A, B) => B): Seq[B]

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

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

    Note: will not terminate for infinite-sized collections.

    Note: Even when applied to a view or a lazy collection it will always force the elements.

    Example:

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

    the type of the elements in the resulting collection

    z

    the initial value

    op

    the binary operator applied to the intermediate result and the element

    returns

    collection with intermediate results

    Definition Classes
    IterableOps
  120. def search[B >: A](elem: B, from: Int, to: Int)(implicit ord: Ordering[B]): SearchResult

    Search within an interval in this sorted sequence for a specific element.

    Search within an interval in this sorted sequence for a specific element. If this sequence is an IndexedSeq, a binary search is used. Otherwise, a linear search is used.

    The sequence should be sorted with the same Ordering before calling; otherwise, the results are undefined.

    elem

    the element to find.

    from

    the index where the search starts.

    to

    the index following where the search ends.

    ord

    the ordering to be used to compare elements.

    returns

    a Found value containing the index corresponding to the element in the sequence, or the InsertionPoint where the element would be inserted if the element is not in the sequence.

    Definition Classes
    SeqOps
    Note

    if to <= from, the search space is empty, and an InsertionPoint at from is returned

    See also

    scala.collection.IndexedSeq

    scala.math.Ordering

    scala.collection.SeqOps, method sorted

  121. def search[B >: A](elem: B)(implicit ord: Ordering[B]): SearchResult

    Search this sorted sequence for a specific element.

    Search this sorted sequence for a specific element. If the sequence is an IndexedSeq, a binary search is used. Otherwise, a linear search is used.

    The sequence should be sorted with the same Ordering before calling; otherwise, the results are undefined.

    elem

    the element to find.

    ord

    the ordering to be used to compare elements.

    returns

    a Found value containing the index corresponding to the element in the sequence, or the InsertionPoint where the element would be inserted if the element is not in the sequence.

    Definition Classes
    SeqOps
    See also

    scala.collection.IndexedSeq

    scala.math.Ordering

    scala.collection.SeqOps, method sorted

  122. def segmentLength(p: (A) => Boolean, from: Int): Int

    Computes the length of the longest segment that starts from some index and whose elements all satisfy some predicate.

    Computes the length of the longest segment that starts from some index and 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 sequence starting from index from such that every element of the segment satisfies the predicate p.

    Definition Classes
    SeqOps
  123. final def segmentLength(p: (A) => Boolean): Int

    Computes the length of the longest segment that starts from the first element and whose elements all satisfy some predicate.

    Computes the length of the longest segment that starts from the first element and 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 segment of this sequence that starts from the first element such that every element of the segment satisfies the predicate p.

    Definition Classes
    SeqOps
  124. final def size: Int

    The size of this sequence.

    The size of this sequence.

    Note: will not terminate for infinite-sized collections.

    returns

    the number of elements in this sequence.

    Definition Classes
    SeqOpsIterableOnceOps
  125. final def sizeCompare(that: Iterable[_]): Int

    Compares the size of this sequence to the size of another Iterable.

    Compares the size of this sequence to the size of another Iterable.

    that

    the Iterable whose size is compared with this sequence's size.

    returns

    A value x where

    x <  0       if this.size <  that.size
    x == 0       if this.size == that.size
    x >  0       if this.size >  that.size

    The method as implemented here does not call size directly; its running time is O(this.size min that.size) instead of O(this.size + that.size). The method should be overridden if computing size is cheap and knownSize returns -1.

    Definition Classes
    SeqOpsIterableOps
  126. final def sizeCompare(otherSize: Int): Int

    Compares the size of this sequence to a test value.

    Compares the size of this sequence to a test value.

    otherSize

    the test value that gets compared with the size.

    returns

    A value x where

    x <  0       if this.size <  otherSize
    x == 0       if this.size == otherSize
    x >  0       if this.size >  otherSize

    The method as implemented here does not call size directly; its running time is O(size min otherSize) instead of O(size). The method should be overridden if computing size is cheap and knownSize returns -1.

    Definition Classes
    SeqOpsIterableOps
    See also

    sizeIs

  127. final def sizeIs: SizeCompareOps

    Returns a value class containing operations for comparing the size of this sequence to a test value.

    Returns a value class containing operations for comparing the size of this sequence to a test value.

    These operations are implemented in terms of sizeCompare(Int), and allow the following more readable usages:

    this.sizeIs < size     // this.sizeCompare(size) < 0
    this.sizeIs <= size    // this.sizeCompare(size) <= 0
    this.sizeIs == size    // this.sizeCompare(size) == 0
    this.sizeIs != size    // this.sizeCompare(size) != 0
    this.sizeIs >= size    // this.sizeCompare(size) >= 0
    this.sizeIs > size     // this.sizeCompare(size) > 0
    Definition Classes
    IterableOps
    Annotations
    @inline()
  128. def slice(from: Int, until: Int): Seq[A]

    Selects an interval of elements.

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

    from <= indexOf(x) < until
    from

    the lowest index to include from this sequence.

    until

    the lowest index to EXCLUDE from this sequence.

    returns

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

    Definition Classes
    IterableOpsIterableOnceOps
  129. def sliding(size: Int, step: Int): Iterator[Seq[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.)

    The returned iterator will be empty when called on an empty collection. The last element the iterator produces may be smaller than the window size when the original collection isn't exhausted by the window before it and its last element isn't skipped by the step before it.

    size

    the number of elements per group

    step

    the distance between the first elements of successive groups

    returns

    An iterator producing sequences of size size, except the last element (which may be the only element) will be smaller if there are fewer than size elements remaining to be grouped.

    Definition Classes
    IterableOps
    Examples:
    1. List(1, 2, 3, 4, 5).sliding(2, 2) = Iterator(List(1, 2), List(3, 4), List(5))

    2. ,
    3. List(1, 2, 3, 4, 5, 6).sliding(2, 3) = Iterator(List(1, 2), List(4, 5))

    See also

    scala.collection.Iterator, method sliding

  130. def sliding(size: Int): Iterator[Seq[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.)

    An empty collection returns an empty iterator, and a non-empty collection containing fewer elements than the window size returns an iterator that will produce the original collection as its only element.

    size

    the number of elements per group

    returns

    An iterator producing sequences of size size, except for a non-empty collection with less than size elements, which returns an iterator that produces the source collection itself as its only element.

    Definition Classes
    IterableOps
    Examples:
    1. List().sliding(2) = empty iterator

    2. ,
    3. List(1).sliding(2) = Iterator(List(1))

    4. ,
    5. List(1, 2).sliding(2) = Iterator(List(1, 2))

    6. ,
    7. List(1, 2, 3).sliding(2) = Iterator(List(1, 2), List(2, 3))

    See also

    scala.collection.Iterator, method sliding

  131. def sortBy[B](f: (A) => B)(implicit ord: Ordering[B]): Seq[A]

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

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

    Note: will not terminate for infinite-sized collections.

    Note: Even when applied to a view or a lazy collection it will always force the elements.

    The sort is stable. That is, elements that are equal (as determined by ord.compare) appear in the same order in the sorted sequence as in the original.

    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 sequence consisting of the elements of this sequence sorted according to the ordering where x < y if ord.lt(f(x), f(y)).

    Definition Classes
    SeqOps
    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

  132. def sortWith(lt: (A, A) => Boolean): Seq[A]

    Sorts this sequence according to a comparison function.

    Sorts this sequence according to a comparison function.

    Note: will not terminate for infinite-sized collections.

    Note: Even when applied to a view or a lazy collection it will always force the elements.

    The sort is stable. That is, elements that are equal (lt returns false for both directions of comparison) appear in the same order in the sorted sequence as in the original.

    lt

    a predicate that is true if its first argument strictly precedes its second argument in the desired ordering.

    returns

    a sequence consisting of the elements of this sequence sorted according to the comparison function lt.

    Definition Classes
    SeqOps
    Example:
    1. List("Steve", "Bobby", "Tom", "John", "Bob").sortWith((x, y) => x.take(3).compareTo(y.take(3)) < 0) =
      List("Bobby", "Bob", "John", "Steve", "Tom")
  133. def sorted[B >: A](implicit ord: Ordering[B]): Seq[A]

    Sorts this sequence according to an Ordering.

    Sorts this sequence according to an Ordering.

    The sort is stable. That is, elements that are equal (as determined by ord.compare) appear in the same order in the sorted sequence as in the original.

    ord

    the ordering to be used to compare elements.

    returns

    a sequence consisting of the elements of this sequence sorted according to the ordering ord.

    Definition Classes
    SeqOps
    See also

    scala.math.Ordering Note: Even when applied to a view or a lazy collection it will always force the elements.

  134. def span(p: (A) => Boolean): (Seq[A], Seq[A])

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

    Splits this 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.

    p

    the test predicate

    returns

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

    Definition Classes
    IterableOpsIterableOnceOps
  135. def splitAt(n: Int): (Seq[A], Seq[A])

    Splits this sequence into a prefix/suffix pair at a given position.

    Splits this sequence into a prefix/suffix pair 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 sequences consisting of the first n elements of this sequence, and the other elements.

    Definition Classes
    IterableOpsIterableOnceOps
  136. def startsWith[B >: A](that: IterableOnce[B], offset: Int = 0): Boolean

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

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

    Note: 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 sequence at index offset, otherwise false.

    Definition Classes
    SeqOps
  137. def stepper[S <: Stepper[_]](implicit shape: StepperShape[A, S]): S

    Returns a scala.collection.Stepper for the elements of this collection.

    Returns a scala.collection.Stepper for the elements of this collection.

    The Stepper enables creating a Java stream to operate on the collection, see scala.jdk.StreamConverters. For collections holding primitive values, the Stepper can be used as an iterator which doesn't box the elements.

    The implicit scala.collection.StepperShape parameter defines the resulting Stepper type according to the element type of this collection.

    Note that this method is overridden in subclasses and the return type is refined to S with EfficientSplit, for example scala.collection.IndexedSeqOps.stepper. For Steppers marked with scala.collection.Stepper.EfficientSplit, the converters in scala.jdk.StreamConverters allow creating parallel streams, whereas bare Steppers can be converted only to sequential streams.

    Definition Classes
    IterableOnce
  138. def sum[B >: A](implicit num: math.Numeric[B]): B

    Sums the elements of this collection.

    Sums the elements of this collection.

    The default implementation uses reduce for a known non-empty collection, foldLeft otherwise.

    Note: will not terminate for infinite-sized collections.

    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 sequence with respect to the + operator in num.

    Definition Classes
    IterableOnceOps
  139. def tail: Seq[A]

    The rest of the collection without its first element.

    The rest of the collection without its first element.

    Definition Classes
    IterableOps
  140. def tails: Iterator[Seq[A]]

    Iterates over the tails of this sequence.

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

    returns

    an iterator over all the tails of this sequence

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

  141. def take(n: Int): Seq[A]

    Selects the first n elements.

    Selects the first n elements.

    n

    the number of elements to take from this sequence.

    returns

    a sequence consisting only of the first n elements of this sequence, or else the whole sequence, if it has less than n elements. If n is negative, returns an empty sequence.

    Definition Classes
    IterableOpsIterableOnceOps
  142. def takeRight(n: Int): Seq[A]

    Selects the last n elements.

    Selects the last n elements.

    n

    the number of elements to take from this sequence.

    returns

    a sequence consisting only of the last n elements of this sequence, or else the whole sequence, if it has less than n elements. If n is negative, returns an empty sequence.

    Definition Classes
    IterableOps
  143. def takeWhile(p: (A) => Boolean): Seq[A]

    Takes longest prefix of elements that satisfy a predicate.

    Takes longest prefix of elements that satisfy a predicate.

    p

    The predicate used to test elements.

    returns

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

    Definition Classes
    IterableOpsIterableOnceOps
  144. def tapEach[U](f: (A) => U): Seq[A]

    Applies a side-effecting function to each element in this collection.

    Applies a side-effecting function to each element in this collection. Strict collections will apply f to their elements immediately, while lazy collections like Views and LazyLists will only apply f on each element if and when that element is evaluated, and each time that element is evaluated.

    U

    the return type of f

    f

    a function to apply to each element in this sequence

    returns

    The same logical collection as this

    Definition Classes
    IterableOpsIterableOnceOps
  145. def to[C1](factory: Factory[A, C1]): C1

    Given a collection factory factory, convert this collection to the appropriate representation for the current element type A.

    Given a collection factory factory, convert this collection to the appropriate representation for the current element type A. Example uses:

    xs.to(List)
    xs.to(ArrayBuffer)
    xs.to(BitSet) // for xs: Iterable[Int]
    Definition Classes
    IterableOnceOps
  146. def toArray[B >: A](implicit arg0: ClassTag[B]): Array[B]

    Convert collection to array.

    Convert collection to array.

    Implementation note: DO NOT call Array.from from this method.

    Definition Classes
    IterableOnceOps
  147. final def toBuffer[B >: A]: Buffer[B]
    Definition Classes
    IterableOnceOps
    Annotations
    @inline()
  148. def toIndexedSeq: immutable.IndexedSeq[A]
    Definition Classes
    IterableOnceOps
  149. def toList: immutable.List[A]
    Definition Classes
    IterableOnceOps
  150. def toMap[K, V](implicit ev: <:<[A, (K, V)]): immutable.Map[K, V]
    Definition Classes
    IterableOnceOps
  151. def toSeq: immutable.Seq[A]

    returns

    This collection as a Seq[A]. This is equivalent to to(Seq) but might be faster.

    Definition Classes
    IterableOnceOps
  152. def toSet[B >: A]: immutable.Set[B]
    Definition Classes
    IterableOnceOps
  153. 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
    SeqFunction1Iterable → AnyRef → Any
  154. def toVector: immutable.Vector[A]
    Definition Classes
    IterableOnceOps
  155. def transpose[B](implicit asIterable: (A) => Iterable[B]): Seq[Seq[B]]

    Transposes this sequence of iterable collections into a sequence of sequences.

    Transposes this sequence of iterable collections into a sequence of sequences.

    The resulting collection's type will be guided by the static type of sequence. For example:

    val xs = List(
               Set(1, 2, 3),
               Set(4, 5, 6)).transpose
    // xs == List(
    //         List(1, 4),
    //         List(2, 5),
    //         List(3, 6))
    
    val ys = Vector(
               List(1, 2, 3),
               List(4, 5, 6)).transpose
    // ys == Vector(
    //         Vector(1, 4),
    //         Vector(2, 5),
    //         Vector(3, 6))

    Note: Even when applied to a view or a lazy collection it will always force the elements.

    B

    the type of the elements of each iterable collection.

    asIterable

    an implicit conversion which asserts that the element type of this sequence is an Iterable.

    returns

    a two-dimensional sequence of sequences which has as nth row the nth column of this sequence.

    Definition Classes
    IterableOps
    Exceptions thrown

    IllegalArgumentException if all collections in this sequence are not of the same size.

  156. def unapply(a: Int): Option[A]

    Tries to extract a B from an A in a pattern matching expression.

    Tries to extract a B from an A in a pattern matching expression.

    Definition Classes
    PartialFunction
  157. def unlift: PartialFunction[Int, B]

    Converts an optional function to a partial function.

    Converts an optional function to a partial function.

    Implicit
    This member is added by an implicit conversion from Seq[A] toUnliftOps[Int, B] performed by method UnliftOps in scala.Function1.This conversion will take place only if A is a subclass of Option[B] (A <: Option[B]).
    Definition Classes
    UnliftOps
    Example:
    1. Unlike Function.unlift, this UnliftOps.unlift method can be used in extractors.

      val of: Int => Option[String] = { i =>
        if (i == 2) {
          Some("matched by an optional function")
        } else {
          None
        }
      }
      
      util.Random.nextInt(4) match {
        case of.unlift(m) => // Convert an optional function to a pattern
          println(m)
        case _ =>
          println("Not matched")
      }
  158. def unzip[A1, A2](implicit asPair: (A) => (A1, A2)): (Seq[A1], Seq[A2])

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

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

    val xs = `Seq`(
               (1, "one"),
               (2, "two"),
               (3, "three")).unzip
    // xs == (`Seq`(1, 2, 3),
    //        `Seq`(one, two, three))
    A1

    the type of the first half of the element pairs

    A2

    the type of the second half of the element pairs

    asPair

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

    returns

    a pair of sequences, containing the first, respectively second half of each element pair of this sequence.

    Definition Classes
    IterableOps
  159. def unzip3[A1, A2, A3](implicit asTriple: (A) => (A1, A2, A3)): (Seq[A1], Seq[A2], Seq[A3])

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

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

    val xs = `Seq`(
               (1, "one", '1'),
               (2, "two", '2'),
               (3, "three", '3')).unzip3
    // xs == (`Seq`(1, 2, 3),
    //        `Seq`(one, two, three),
    //        `Seq`(1, 2, 3))
    A1

    the type of the first member of the element triples

    A2

    the type of the second member of the element triples

    A3

    the type of the third member of the element triples

    asTriple

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

    returns

    a triple of sequences, containing the first, second, respectively third member of each element triple of this sequence.

    Definition Classes
    IterableOps
  160. def updated[B >: A](index: Int, elem: B): Seq[B]

    A copy of this sequence with one single replaced element.

    A copy of this sequence with one single replaced element.

    B

    the element type of the returned sequence.

    index

    the position of the replacement

    elem

    the replacing element

    returns

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

    Definition Classes
    SeqOps
    Exceptions thrown

    IndexOutOfBoundsException if index does not satisfy 0 <= index < length. In case of a lazy collection this exception may be thrown at a later time or not at all (if the end of the collection is never evaluated).

  161. def view: SeqView[A]

    A view over the elements of this collection.

    A view over the elements of this collection.

    Definition Classes
    SeqOpsIterableOps
  162. def withFilter(p: (A) => Boolean): WithFilter[A, [_]Seq[_]]

    Creates a non-strict filter of this sequence.

    Creates a non-strict filter of this sequence.

    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 sequence which satisfy the predicate p.

    Definition Classes
    IterableOps
  163. def zip[B](that: IterableOnce[B]): Seq[(A, B)]

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

    Returns a sequence formed from this 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 sequence containing pairs consisting of corresponding elements of this sequence and that. The length of the returned collection is the minimum of the lengths of this sequence and that.

    Definition Classes
    IterableOps
  164. def zipAll[A1 >: A, B](that: Iterable[B], thisElem: A1, thatElem: B): Seq[(A1, B)]

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

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

    thatElem

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

    returns

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

    Definition Classes
    IterableOps
  165. def zipWithIndex: Seq[(A, Int)]

    Zips this sequence with its indices.

    Zips this sequence with its indices.

    returns

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

    Definition Classes
    IterableOpsIterableOnceOps
    Example:
    1. List("a", "b", "c").zipWithIndex == List(("a", 0), ("b", 1), ("c", 2))

Deprecated Value Members

  1. def /:[B](z: B)(op: (B, A) => B): B
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    Annotations
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    Deprecated

    (Since version 2.13.0) Use .iterator.foldLeft instead

  2. final def /:[B](z: B)(op: (B, A) => B): B
    Definition Classes
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    Annotations
    @deprecated @inline()
    Deprecated

    (Since version 2.13.0) Use foldLeft instead of /:

  3. def :\[B](z: B)(op: (A, B) => B): B
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  4. final def :\[B](z: B)(op: (A, B) => B): B
    Definition Classes
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    Annotations
    @deprecated @inline()
    Deprecated

    (Since version 2.13.0) Use foldRight instead of :\

  5. def aggregate[B](z: => B)(seqop: (B, A) => B, combop: (B, B) => B): B
    Definition Classes
    IterableOnceOps
    Annotations
    @deprecated
    Deprecated

    (Since version 2.13.0) aggregate is not relevant for sequential collections. Use foldLeft(z)(seqop) instead.

  6. def collectFirst[B](f: PartialFunction[A, B]): Option[B]
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  7. def companion: IterableFactory[[_]Seq[_]]
    Definition Classes
    IterableOps
    Annotations
    @deprecated @deprecatedOverriding() @inline()
    Deprecated

    (Since version 2.13.0) Use iterableFactory instead

  8. def copyToBuffer(dest: Buffer[A]): Unit
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  9. final def copyToBuffer[B >: A](dest: Buffer[B]): Unit
    Definition Classes
    IterableOnceOps
    Annotations
    @deprecated @inline()
    Deprecated

    (Since version 2.13.0) Use dest ++= coll instead

  10. def count(f: (A) => Boolean): Int
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  11. def exists(f: (A) => Boolean): Boolean
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  12. def filter(f: (A) => Boolean): Iterator[A]
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  13. def find(p: (A) => Boolean): Option[A]
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  14. def flatMap[B](f: (A) => IterableOnce[B]): IterableOnce[B]
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    Annotations
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    (Since version 2.13.0) Use .iterator.flatMap instead or consider requiring an Iterable

  15. def fold[A1 >: A](z: A1)(op: (A1, A1) => A1): A1
    Implicit
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  16. def foldLeft[B](z: B)(op: (B, A) => B): B
    Implicit
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  17. def foldRight[B](z: B)(op: (A, B) => B): B
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    Deprecated

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  18. def forall(f: (A) => Boolean): Boolean
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  19. def foreach[U](f: (A) => U): Unit
    Implicit
    This member is added by an implicit conversion from Seq[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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    Annotations
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    Deprecated

    (Since version 2.13.0) Use .iterator.foreach(...) instead

  20. def hasDefiniteSize: Boolean

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

    Tests whether this sequence 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. Non-empty Iterators usually return false even if they were created from a collection with a known finite size.

    Note: many collection methods will not work on collections of infinite sizes. The typical failure mode is an infinite loop. These methods always attempt a traversal without checking first that hasDefiniteSize returns true. However, checking hasDefiniteSize can provide an assurance that size is well-defined and non-termination is not a concern.

    returns

    true if this collection is known to have finite size, false otherwise.

    Definition Classes
    IterableOnceOps
    Annotations
    @deprecated
    Deprecated

    (Since version 2.13.0) Check .knownSize instead of .hasDefiniteSize for more actionable information (see scaladoc for details)

    See also

    method knownSize for a more useful alternative

  21. def isEmpty: Boolean
    Implicit
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    (Since version 2.13.0) Use .iterator.isEmpty instead

  22. def map[B](f: (A) => B): IterableOnce[B]
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    (Since version 2.13.0) Use .iterator.map instead or consider requiring an Iterable

  23. def max(implicit ord: math.Ordering[A]): A
    Implicit
    This member is added by an implicit conversion from Seq[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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    Annotations
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    (Since version 2.13.0) Use .iterator.max instead

  24. def maxBy[B](f: (A) => B)(implicit cmp: math.Ordering[B]): A
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    (Since version 2.13.0) Use .iterator.maxBy(...) instead

  25. def min(implicit ord: math.Ordering[A]): A
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    Annotations
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    (Since version 2.13.0) Use .iterator.min instead

  26. def minBy[B](f: (A) => B)(implicit cmp: math.Ordering[B]): A
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    (Since version 2.13.0) Use .iterator.minBy(...) instead

  27. def mkString: String
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  28. def mkString(sep: String): String
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  29. def mkString(start: String, sep: String, end: String): String
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  30. def nonEmpty: Boolean
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  31. final 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 sequence such that every element of the segment satisfies the predicate p.

    Definition Classes
    SeqOps
    Annotations
    @deprecated @inline()
    Deprecated

    (Since version 2.13.0) Use segmentLength instead of prefixLength

  32. def product(implicit num: math.Numeric[A]): A
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  33. def reduce(f: (A, A) => A): A
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  34. def reduceLeft(f: (A, A) => A): A
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  35. def reduceLeftOption(f: (A, A) => A): Option[A]
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  36. def reduceOption(f: (A, A) => A): Option[A]
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  37. def reduceRight(f: (A, A) => A): A
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  38. def reduceRightOption(f: (A, A) => A): Option[A]
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  39. final def repr: Seq[A]
    Definition Classes
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    (Since version 2.13.0) Use coll instead of repr in a collection implementation, use the collection value itself from the outside

  40. def reverseMap[B](f: (A) => B): Seq[B]
    Definition Classes
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    (Since version 2.13.0) Use .reverseIterator.map(f).to(...) instead of .reverseMap(f)

  41. def sameElements[B >: A](that: IterableOnce[B]): Boolean
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  42. def seq: Seq.this.type
    Definition Classes
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    (Since version 2.13.0) Iterable.seq always returns the iterable itself

  43. def size: Int
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  44. def sum(implicit num: math.Numeric[A]): A
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  45. def to[C1](factory: Factory[A, C1]): C1
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  46. def toArray[B >: A](implicit arg0: ClassTag[B]): Array[B]
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  47. def toBuffer[B >: A]: Buffer[B]
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  48. def toIndexedSeq: IndexedSeq[A]
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  49. final def toIterable: Iterable[A]
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  50. final def toIterable: Seq.this.type

    returns

    This collection as an Iterable[A]. No new collection will be built if this is already an Iterable[A].

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    (Since version 2.13.7) toIterable is internal and will be made protected; its name is similar to toList or toSeq, but it doesn't copy non-immutable collections

  51. def toIterator: Iterator[A]
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  52. final def toIterator: Iterator[A]
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  53. def toList: immutable.List[A]
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  54. def toMap[K, V](implicit ev: <:<[A, (K, V)]): immutable.Map[K, V]
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  55. def toSeq: immutable.Seq[A]
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  56. def toSet[B >: A]: immutable.Set[B]
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  57. def toStream: immutable.Stream[A]
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  58. final def toStream: immutable.Stream[A]
    Definition Classes
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    (Since version 2.13.0) Use .to(LazyList) instead of .toStream

  59. final def toTraversable: Traversable[A]
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  60. final def toTraversable: Traversable[A]

    Converts this sequence to an unspecified Iterable.

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

    returns

    An Iterable containing all elements of this sequence.

    Definition Classes
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    (Since version 2.13.0) toTraversable is internal and will be made protected; its name is similar to toList or toSeq, but it doesn't copy non-immutable collections

  61. def toVector: immutable.Vector[A]
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  62. final def union[B >: A](that: Seq[B]): Seq[B]

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

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

    B

    the element type of the returned sequence.

    that

    the sequence to add.

    returns

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

    Definition Classes
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    (Since version 2.13.0) Use concat instead

  63. def view(from: Int, until: Int): View[A]

    A view over a slice of the elements of this collection.

    A view over a slice of the elements of this collection.

    Definition Classes
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    (Since version 2.13.0) Use .view.slice(from, until) instead of .view(from, until)

  64. def withFilter(f: (A) => Boolean): Iterator[A]
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