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trait SetOps[A, +CC[_], +C <: SetOps[A, CC, C]] extends IterableOps[A, CC, C] with (A) => Boolean

Base trait for set operations

Source
Set.scala
Linear Supertypes
(A) => Boolean, IterableOps[A, CC, C], IterableOnceOps[A, CC, C], IterableOnce[A], AnyRef, Any
Type Hierarchy
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Inherited
  1. SetOps
  2. Function1
  3. IterableOps
  4. IterableOnceOps
  5. IterableOnce
  6. AnyRef
  7. Any
Implicitly
  1. by iterableOnceExtensionMethods
  2. by any2stringadd
  3. by StringFormat
  4. by Ensuring
  5. by ArrowAssoc
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Visibility
  1. Public
  2. Protected

Abstract Value Members

  1. abstract def coll: C

    returns

    This collection as a C.

    Attributes
    protected
    Definition Classes
    IterableOps
  2. abstract def contains(elem: A): Boolean
  3. abstract def diff(that: Set[A]): C

    Computes the difference of this set and another set.

    Computes the difference of this set and another set.

    that

    the set of elements to exclude.

    returns

    a set containing those elements of this set that are not also contained in the given set that.

  4. abstract def fromSpecific(coll: IterableOnce[A]): C

    Defines how to turn a given Iterable[A] into a collection of type C.

    Defines how to turn a given Iterable[A] into a collection of type C.

    This process can be done in a strict way or a non-strict way (ie. without evaluating the elements of the resulting collections). In other words, this methods defines the evaluation model of the collection.

    Attributes
    protected
    Definition Classes
    IterableOps
    Note

    When implementing a custom collection type and refining C to the new type, this method needs to be overridden (the compiler will issue an error otherwise). In the common case where C =:= CC[A], this can be done by mixing in the scala.collection.IterableFactoryDefaults trait, which implements the method using iterableFactory.

    ,

    As witnessed by the @uncheckedVariance annotation, using this method might be unsound. However, as long as it is called with an Iterable[A] obtained from this collection (as it is the case in the implementations of operations where we use a View[A]), it is safe.

  5. abstract def iterableFactory: IterableFactory[CC]

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

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

    Definition Classes
    IterableOps
    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).

  6. abstract def iterator: Iterator[A]

    Iterator can be used only once

    Iterator can be used only once

    Definition Classes
    IterableOnce
  7. abstract def newSpecificBuilder: Builder[A, C]

    returns

    a strict builder for the same collection type. Note that in the case of lazy collections (e.g. scala.collection.View or scala.collection.immutable.LazyList), it is possible to implement this method but the resulting Builder will break laziness. As a consequence, operations should preferably be implemented with fromSpecific instead of this method.

    Attributes
    protected
    Definition Classes
    IterableOps
    Note

    When implementing a custom collection type and refining C to the new type, this method needs to be overridden (the compiler will issue an error otherwise). In the common case where C =:= CC[A], this can be done by mixing in the scala.collection.IterableFactoryDefaults trait, which implements the method using iterableFactory.

    ,

    As witnessed by the @uncheckedVariance annotation, using this method might be unsound. However, as long as the returned builder is only fed with A values taken from this instance, it is safe.

  8. abstract def toIterable: Iterable[A]

    returns

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

    Definition Classes
    IterableOps
    Annotations
    @deprecated
    Deprecated

    (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

Concrete Value Members

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

    Test two objects for inequality.

    Test two objects for inequality.

    returns

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

    Definition Classes
    AnyRef → Any
  2. final def ##: Int

    Equivalent to x.hashCode except for boxed numeric types and null.

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

    returns

    a hash value consistent with ==

    Definition Classes
    AnyRef → Any
  3. final def &(that: Set[A]): C

    Alias for intersect

    Alias for intersect

    Annotations
    @inline()
  4. final def &~(that: Set[A]): C

    Alias for diff

    Alias for diff

    Annotations
    @inline()
  5. final def ++(that: IterableOnce[A]): C

    Alias for concat

    Alias for concat

    Annotations
    @inline()
  6. final def ++[B >: A](suffix: IterableOnce[B]): CC[B]

    Alias for concat

    Alias for concat

    Definition Classes
    IterableOps
    Annotations
    @inline()
  7. def ->[B](y: B): (SetOps[A, CC, C], B)
    Implicit
    This member is added by an implicit conversion from SetOps[A, CC, C] toArrowAssoc[SetOps[A, CC, C]] performed by method ArrowAssoc in scala.Predef.
    Definition Classes
    ArrowAssoc
    Annotations
    @inline()
  8. final def ==(arg0: Any): Boolean

    The expression x == that is equivalent to if (x eq null) that eq null else x.equals(that).

    The expression x == that is equivalent to if (x eq null) that eq null else x.equals(that).

    returns

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

    Definition Classes
    AnyRef → Any
  9. final def addString(b: mutable.StringBuilder): mutable.StringBuilder

    Appends all elements of this set to a string builder.

    Appends all elements of this set to a string builder. The written text consists of the string representations (w.r.t. the method toString) of all elements of this set 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()
  10. final def addString(b: mutable.StringBuilder, sep: String): mutable.StringBuilder

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

    Appends all elements of this set 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 set, 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()
  11. def addString(b: mutable.StringBuilder, start: String, sep: String, end: String): mutable.StringBuilder

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

    Appends all elements of this set 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 set 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
  12. def andThen[A](g: (Boolean) => A): (A) => A

    Composes two instances of Function1 in a new Function1, with this function applied first.

    Composes two instances of Function1 in a new Function1, with this function applied first.

    A

    the result type of function g

    g

    a function R => A

    returns

    a new function f such that f(x) == g(apply(x))

    Definition Classes
    Function1
    Annotations
    @unspecialized()
  13. final def apply(elem: A): Boolean

    Tests if some element is contained in this set.

    Tests if some element is contained in this set.

    This method is equivalent to contains. It allows sets to be interpreted as predicates.

    elem

    the element to test for membership.

    returns

    true if elem is contained in this set, false otherwise.

    Definition Classes
    SetOpsFunction1
    Annotations
    @inline()
  14. final def asInstanceOf[T0]: T0

    Cast the receiver object to be of type T0.

    Cast the receiver object to be of type T0.

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

    returns

    the receiver object.

    Definition Classes
    Any
    Exceptions thrown

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

  15. def clone(): AnyRef

    Create a copy of the receiver object.

    Create a copy of the receiver object.

    The default implementation of the clone method is platform dependent.

    returns

    a copy of the receiver object.

    Attributes
    protected[lang]
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.CloneNotSupportedException]) @native()
    Note

    not specified by SLS as a member of AnyRef

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

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

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

    B

    the element type of the returned set.

    pf

    the partial function which filters and maps the set.

    returns

    a new set 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
  17. def collectFirst[B](pf: PartialFunction[A, B]): Option[B]

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

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

    Note: may not terminate for infinite-sized collections.

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

    pf

    the partial function

    returns

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

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

  18. def compose[A](g: (A) => A): (A) => Boolean

    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()
  19. def concat(that: IterableOnce[A]): C

    Creates a new set by adding all elements contained in another collection to this set, omitting duplicates.

    Creates a new set by adding all elements contained in another collection to this set, omitting duplicates.

    This method takes a collection of elements and adds all elements, omitting duplicates, into set.

    Example:

    scala> val a = Set(1, 2) concat Set(2, 3)
    a: scala.collection.immutable.Set[Int] = Set(1, 2, 3)
    that

    the collection containing the elements to add.

    returns

    a new set with the given elements added, omitting duplicates.

  20. def concat[B >: A](suffix: IterableOnce[B]): CC[B]

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

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

    B

    the element type of the returned collection.

    suffix

    the traversable to append.

    returns

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

    Definition Classes
    IterableOps
  21. 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 set.

    Copying will stop once either all the elements of this set 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.

  22. 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 set.

    Copying will stop once either all the elements of this set 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.

  23. 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 set.

    Copying will stop once either all the elements of this set 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.

  24. 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
  25. def count(p: (A) => Boolean): Int

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

    Counts the number of elements in the set 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
  26. def drop(n: Int): C

    Selects all elements except first n ones.

    Selects all elements except first n ones.

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

    n

    the number of elements to drop from this set.

    returns

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

    Definition Classes
    IterableOpsIterableOnceOps
  27. def dropRight(n: Int): C

    Selects all elements except last n ones.

    Selects all elements except last n ones.

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

    n

    the number of elements to drop from this set.

    returns

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

    Definition Classes
    IterableOps
  28. def dropWhile(p: (A) => Boolean): C

    Drops longest prefix of elements that satisfy a predicate.

    Drops longest prefix of elements that satisfy a predicate.

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

    p

    The predicate used to test elements.

    returns

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

    Definition Classes
    IterableOpsIterableOnceOps
  29. def empty: C

    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
    IterableOps
  30. def ensuring(cond: (SetOps[A, CC, C]) => Boolean, msg: => Any): SetOps[A, CC, C]
    Implicit
    This member is added by an implicit conversion from SetOps[A, CC, C] toEnsuring[SetOps[A, CC, C]] performed by method Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  31. def ensuring(cond: (SetOps[A, CC, C]) => Boolean): SetOps[A, CC, C]
    Implicit
    This member is added by an implicit conversion from SetOps[A, CC, C] toEnsuring[SetOps[A, CC, C]] performed by method Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  32. def ensuring(cond: Boolean, msg: => Any): SetOps[A, CC, C]
    Implicit
    This member is added by an implicit conversion from SetOps[A, CC, C] toEnsuring[SetOps[A, CC, C]] performed by method Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  33. def ensuring(cond: Boolean): SetOps[A, CC, C]
    Implicit
    This member is added by an implicit conversion from SetOps[A, CC, C] toEnsuring[SetOps[A, CC, C]] performed by method Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  34. final def eq(arg0: AnyRef): Boolean

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

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

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

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

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

    returns

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

    Definition Classes
    AnyRef
  35. def equals(arg0: AnyRef): Boolean

    The equality method for reference types.

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

    See also equals in scala.Any.

    returns

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

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

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

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

    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 set, otherwise false

    Definition Classes
    IterableOnceOps
  37. def filter(pred: (A) => Boolean): C

    Selects all elements of this set which satisfy a predicate.

    Selects all elements of this set which satisfy a predicate.

    returns

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

    Definition Classes
    IterableOpsIterableOnceOps
  38. def filterNot(pred: (A) => Boolean): C

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

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

    pred

    the predicate used to test elements.

    returns

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

    Definition Classes
    IterableOpsIterableOnceOps
  39. def finalize(): Unit

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

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

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

    Attributes
    protected[lang]
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.Throwable])
    Note

    not specified by SLS as a member of AnyRef

  40. def find(p: (A) => Boolean): Option[A]

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

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

    Note: may not terminate for infinite-sized collections.

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

    p

    the predicate used to test elements.

    returns

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

    Definition Classes
    IterableOnceOps
  41. def flatMap[B](f: (A) => IterableOnce[B]): CC[B]

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

    Builds a new set by applying a function to all elements of this set 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 set. 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 set resulting from applying the given collection-valued function f to each element of this set and concatenating the results.

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

    Converts this set of traversable collections into a set formed by the elements of these traversable collections.

    Converts this set of traversable collections into a set formed by the elements of these traversable collections.

    The resulting collection's type will be guided by the type of set. 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 traversable collection.

    asIterable

    an implicit conversion which asserts that the element type of this set is a GenTraversable.

    returns

    a new set resulting from concatenating all element sets.

    Definition Classes
    IterableOpsIterableOnceOps
  43. def fold[A1 >: A](z: A1)(op: (A1, A1) => A1): A1

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

    Folds the elements of this set 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 set is empty.

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

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

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

    Note: will not terminate for infinite-sized collections.

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

    B

    the result type of the binary operator.

    z

    the start value.

    op

    the binary operator.

    returns

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

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

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

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

    Note: will not terminate for infinite-sized collections.

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

    B

    the result type of the binary operator.

    z

    the start value.

    op

    the binary operator.

    returns

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

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

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

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

    Note: may not terminate for infinite-sized collections.

    p

    the predicate used to test elements.

    returns

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

    Definition Classes
    IterableOnceOps
  47. 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
  48. final def getClass(): Class[_ <: AnyRef]

    Returns the runtime class representation of the object.

    Returns the runtime class representation of the object.

    returns

    a class object corresponding to the runtime type of the receiver.

    Definition Classes
    AnyRef → Any
    Annotations
    @native()
  49. def groupBy[K](f: (A) => K): immutable.Map[K, C]

    Partitions this set into a map of sets according to some discriminator function.

    Partitions this set into a map of sets 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 sets 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 set of those elements x for which f(x) equals k.

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

    Partitions this set into a map of sets according to a discriminator function key.

    Partitions this set into a map of sets 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
  51. def groupMapReduce[K, B](key: (A) => K)(f: (A) => B)(reduce: (B, B) => B): immutable.Map[K, B]

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

    Partitions this set 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
  52. def grouped(size: Int): Iterator[C]

    Partitions elements in fixed size sets.

    Partitions elements in fixed size sets.

    size

    the number of elements per group

    returns

    An iterator producing sets 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

  53. 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
    AnyRef → Any
    Annotations
    @native()
  54. def head: A

    Selects the first element of this set.

    Selects the first element of this set.

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

    returns

    the first element of this set.

    Definition Classes
    IterableOps
    Exceptions thrown

    NoSuchElementException if the set is empty.

  55. def headOption: Option[A]

    Optionally selects the first element.

    Optionally selects the first element.

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

    returns

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

    Definition Classes
    IterableOps
  56. def init: C

    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
  57. def inits: Iterator[C]

    Iterates over the inits of this set.

    Iterates over the inits of this set. The first value will be this set and the final one will be an empty set, 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 set

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

  58. def intersect(that: Set[A]): C

    Computes the intersection between this set and another set.

    Computes the intersection between this set and another set.

    that

    the set to intersect with.

    returns

    a new set consisting of all elements that are both in this set and in the given set that.

  59. def isEmpty: Boolean

    Tests whether the set is empty.

    Tests whether the set is empty.

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

    returns

    true if the set contains no elements, false otherwise.

    Definition Classes
    IterableOnceOps
  60. final def isInstanceOf[T0]: Boolean

    Test whether the dynamic type of the receiver object has the same erasure as T0.

    Test whether the dynamic type of the receiver object has the same erasure as T0.

    Depending on what T0 is, the test is done in one of the below ways:

    • T0 is a non-parameterized class type, e.g. BigDecimal: this method returns true if the value of the receiver object is a BigDecimal or a subtype of BigDecimal.
    • T0 is a parameterized class type, e.g. List[Int]: this method returns true if the value of the receiver object is some List[X] for any X. For example, List(1, 2, 3).isInstanceOf[List[String]] will return true.
    • T0 is some singleton type x.type or literal x: this method returns this.eq(x). For example, x.isInstanceOf[1] is equivalent to x.eq(1)
    • T0 is an intersection X with Y or X & Y: this method is equivalent to x.isInstanceOf[X] && x.isInstanceOf[Y]
    • T0 is a union X | Y: this method is equivalent to x.isInstanceOf[X] || x.isInstanceOf[Y]
    • T0 is a type parameter or an abstract type member: this method is equivalent to isInstanceOf[U] where U is T0's upper bound, Any if T0 is unbounded. For example, x.isInstanceOf[A] where A is an unbounded type parameter will return true for any value of x.

    This is exactly equivalent to the type pattern _: T0

    returns

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

    Definition Classes
    Any
    Note

    due to the unexpectedness of List(1, 2, 3).isInstanceOf[List[String]] returning true and x.isInstanceOf[A] where A is a type parameter or abstract member returning true, these forms issue a warning.

  61. def isTraversableAgain: Boolean

    Tests whether this set can be repeatedly traversed.

    Tests whether this set 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
  62. def knownSize: Int

    returns

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

    Definition Classes
    IterableOnce
  63. def last: A

    Selects the last element.

    Selects the last element.

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

    returns

    The last element of this set.

    Definition Classes
    IterableOps
    Exceptions thrown

    NoSuchElementException If the set is empty.

  64. def lastOption: Option[A]

    Optionally selects the last element.

    Optionally selects the last element.

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

    returns

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

    Definition Classes
    IterableOps
  65. def map[B](f: (A) => B): CC[B]

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

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

    B

    the element type of the returned set.

    f

    the function to apply to each element.

    returns

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

    Definition Classes
    IterableOpsIterableOnceOps
  66. 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 set with respect to the ordering ord.

    Definition Classes
    IterableOnceOps
    Exceptions thrown

    UnsupportedOperationException if this set is empty.

  67. def maxBy[B](f: (A) => B)(implicit cmp: 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.

    cmp

    An ordering to be used for comparing elements.

    returns

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

    Definition Classes
    IterableOnceOps
    Exceptions thrown

    UnsupportedOperationException if this set is empty.

  68. def maxByOption[B](f: (A) => B)(implicit cmp: 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.

    cmp

    An ordering to be used for comparing elements.

    returns

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

    Definition Classes
    IterableOnceOps
  69. 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 set with respect to the ordering ord.

    Definition Classes
    IterableOnceOps
  70. 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 set with respect to the ordering ord.

    Definition Classes
    IterableOnceOps
    Exceptions thrown

    UnsupportedOperationException if this set is empty.

  71. def minBy[B](f: (A) => B)(implicit cmp: 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.

    cmp

    An ordering to be used for comparing elements.

    returns

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

    Definition Classes
    IterableOnceOps
    Exceptions thrown

    UnsupportedOperationException if this set is empty.

  72. def minByOption[B](f: (A) => B)(implicit cmp: 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.

    cmp

    An ordering to be used for comparing elements.

    returns

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

    Definition Classes
    IterableOnceOps
  73. 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 set with respect to the ordering ord.

    Definition Classes
    IterableOnceOps
  74. final def mkString: String

    Displays all elements of this set in a string.

    Displays all elements of this set in a string.

    Delegates to addString, which can be overridden.

    returns

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

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

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

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

    Delegates to addString, which can be overridden.

    sep

    the separator string.

    returns

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

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

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

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

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

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

  77. final def ne(arg0: AnyRef): Boolean

    Equivalent to !(this eq that).

    Equivalent to !(this eq that).

    returns

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

    Definition Classes
    AnyRef
  78. def nonEmpty: Boolean

    Tests whether the set is not empty.

    Tests whether the set is not empty.

    returns

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

    Definition Classes
    IterableOnceOps
    Annotations
    @deprecatedOverriding()
  79. final def notify(): Unit

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

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

    Definition Classes
    AnyRef
    Annotations
    @native()
    Note

    not specified by SLS as a member of AnyRef

  80. final def notifyAll(): Unit

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

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

    Definition Classes
    AnyRef
    Annotations
    @native()
    Note

    not specified by SLS as a member of AnyRef

  81. def partition(p: (A) => Boolean): (C, C)

    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
  82. def partitionMap[A1, A2](f: (A) => Either[A1, A2]): (CC[A1], CC[A2])

    Applies a function f to each element of the set and returns a pair of sets: 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 set and returns a pair of sets: 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 = `Set`(1, "one", 2, "two", 3, "three") partitionMap {
     case i: Int => Left(i)
     case s: String => Right(s)
    }
    // xs == (`Set`(1, 2, 3),
    //        `Set`(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 set to an scala.util.Either

    returns

    a pair of sets: 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
  83. def product[B >: A](implicit num: math.Numeric[B]): B

    Multiplies up the elements of this collection.

    Multiplies up the elements of this collection.

    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 set with respect to the * operator in num.

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

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

    Reduces the elements of this set 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 set is nonempty.

    Definition Classes
    IterableOnceOps
    Exceptions thrown

    UnsupportedOperationException if this set is empty.

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

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

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

    Note: will not terminate for infinite-sized collections.

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

    B

    the result type of the binary operator.

    op

    the binary operator.

    returns

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

    Definition Classes
    IterableOnceOps
    Exceptions thrown

    UnsupportedOperationException if this set is empty.

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

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

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

    Note: will not terminate for infinite-sized collections.

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

    B

    the result type of the binary operator.

    op

    the binary operator.

    returns

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

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

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

    Reduces the elements of this set, 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
  88. def reduceRight[B >: A](op: (A, B) => B): B

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

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

    Note: will not terminate for infinite-sized collections.

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

    B

    the result type of the binary operator.

    op

    the binary operator.

    returns

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

    Definition Classes
    IterableOnceOps
    Exceptions thrown

    UnsupportedOperationException if this set is empty.

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

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

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

    Note: will not terminate for infinite-sized collections.

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

    B

    the result type of the binary operator.

    op

    the binary operator.

    returns

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

    Definition Classes
    IterableOnceOps
  90. def reversed: Iterable[A]
    Attributes
    protected
    Definition Classes
    IterableOnceOps
  91. def scan[B >: A](z: B)(op: (B, B) => B): CC[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 set containing the prefix scan of the elements in this set

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

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

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

    Note: will not terminate for infinite-sized collections.

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

    B

    the type of the elements in the resulting collection

    z

    the initial value

    op

    the binary operator applied to the intermediate result and the element

    returns

    collection with intermediate results

    Definition Classes
    IterableOpsIterableOnceOps
  93. def scanRight[B](z: B)(op: (A, B) => B): CC[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: might return different results for different runs, unless the underlying collection type is ordered.

    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
  94. def size: Int

    The size of this set.

    The size of this set.

    Note: will not terminate for infinite-sized collections.

    returns

    the number of elements in this set.

    Definition Classes
    IterableOnceOps
  95. def sizeCompare(that: Iterable[_]): Int

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

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

    that

    the Iterable whose size is compared with this set'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
    IterableOps
  96. def sizeCompare(otherSize: Int): Int

    Compares the size of this set to a test value.

    Compares the size of this set 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
    IterableOps
    See also

    sizeIs

  97. final def sizeIs: SizeCompareOps

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

    Returns a value class containing operations for comparing the size of this set 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()
  98. def slice(from: Int, until: Int): C

    Selects an interval of elements.

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

    from <= indexOf(x) < until

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

    from

    the lowest index to include from this set.

    until

    the lowest index to EXCLUDE from this set.

    returns

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

    Definition Classes
    IterableOpsIterableOnceOps
  99. def sliding(size: Int, step: Int): Iterator[C]

    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 sets 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

  100. def sliding(size: Int): Iterator[C]

    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 sets 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

  101. def span(p: (A) => Boolean): (C, C)

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

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

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

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

    p

    the test predicate

    returns

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

    Definition Classes
    IterableOpsIterableOnceOps
  102. def splitAt(n: Int): (C, C)

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

    Splits this set 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).

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

    n

    the position at which to split.

    returns

    a pair of sets consisting of the first n elements of this set, and the other elements.

    Definition Classes
    IterableOpsIterableOnceOps
  103. 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
  104. def subsetOf(that: Set[A]): Boolean

    Tests whether this set is a subset of another set.

    Tests whether this set is a subset of another set.

    that

    the set to test.

    returns

    true if this set is a subset of that, i.e. if every element of this set is also an element of that.

  105. def subsets(): Iterator[C]

    An iterator over all subsets of this set.

    An iterator over all subsets of this set.

    returns

    the iterator.

  106. def subsets(len: Int): Iterator[C]

    An iterator over all subsets of this set of the given size.

    An iterator over all subsets of this set of the given size. If the requested size is impossible, an empty iterator is returned.

    len

    the size of the subsets.

    returns

    the iterator.

  107. def sum[B >: A](implicit num: math.Numeric[B]): B

    Sums up the elements of this collection.

    Sums up the elements of this collection.

    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 set with respect to the + operator in num.

    Definition Classes
    IterableOnceOps
  108. final def synchronized[T0](arg0: => T0): T0

    Executes the code in body with an exclusive lock on this.

    Executes the code in body with an exclusive lock on this.

    returns

    the result of body

    Definition Classes
    AnyRef
  109. def tail: C

    The rest of the collection without its first element.

    The rest of the collection without its first element.

    Definition Classes
    IterableOps
  110. def tails: Iterator[C]

    Iterates over the tails of this set.

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

    returns

    an iterator over all the tails of this set

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

  111. def take(n: Int): C

    Selects the first n elements.

    Selects the first n elements.

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

    n

    the number of elements to take from this set.

    returns

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

    Definition Classes
    IterableOpsIterableOnceOps
  112. def takeRight(n: Int): C

    Selects the last n elements.

    Selects the last n elements.

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

    n

    the number of elements to take from this set.

    returns

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

    Definition Classes
    IterableOps
  113. def takeWhile(p: (A) => Boolean): C

    Takes longest prefix of elements that satisfy a predicate.

    Takes longest prefix of elements that satisfy a predicate.

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

    p

    The predicate used to test elements.

    returns

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

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

    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 set

    returns

    The same logical collection as this

    Definition Classes
    IterableOpsIterableOnceOps
  115. 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
  116. 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
  117. final def toBuffer[B >: A]: Buffer[B]
    Definition Classes
    IterableOnceOps
    Annotations
    @inline()
  118. def toIndexedSeq: immutable.IndexedSeq[A]
    Definition Classes
    IterableOnceOps
  119. def toList: immutable.List[A]
    Definition Classes
    IterableOnceOps
  120. def toMap[K, V](implicit ev: <:<[A, (K, V)]): immutable.Map[K, V]
    Definition Classes
    IterableOnceOps
  121. 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
  122. def toSet[B >: A]: immutable.Set[B]
    Definition Classes
    IterableOnceOps
  123. 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
    Function1 → AnyRef → Any
  124. def toVector: immutable.Vector[A]
    Definition Classes
    IterableOnceOps
  125. def transpose[B](implicit asIterable: (A) => Iterable[B]): CC[CC[B]]

    Transposes this set of iterable collections into a set of sets.

    Transposes this set of iterable collections into a set of sets.

    The resulting collection's type will be guided by the static type of set. 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 set is an Iterable.

    returns

    a two-dimensional set of sets which has as nth row the nth column of this set.

    Definition Classes
    IterableOps
    Exceptions thrown

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

  126. final def union(that: Set[A]): C

    Computes the union between of set and another set.

    Computes the union between of set and another set.

    that

    the set to form the union with.

    returns

    a new set consisting of all elements that are in this set or in the given set that.

    Annotations
    @inline()
  127. def unzip[A1, A2](implicit asPair: (A) => (A1, A2)): (CC[A1], CC[A2])

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

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

    val xs = `Set`(
               (1, "one"),
               (2, "two"),
               (3, "three")).unzip
    // xs == (`Set`(1, 2, 3),
    //        `Set`(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 set is a pair.

    returns

    a pair of sets, containing the first, respectively second half of each element pair of this set.

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

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

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

    val xs = `Set`(
               (1, "one", '1'),
               (2, "two", '2'),
               (3, "three", '3')).unzip3
    // xs == (`Set`(1, 2, 3),
    //        `Set`(one, two, three),
    //        `Set`(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 set is a triple.

    returns

    a triple of sets, containing the first, second, respectively third member of each element triple of this set.

    Definition Classes
    IterableOps
  129. def view: View[A]

    A view over the elements of this collection.

    A view over the elements of this collection.

    Definition Classes
    IterableOps
  130. final def wait(): Unit

    See https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#wait--.

    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.InterruptedException])
    Note

    not specified by SLS as a member of AnyRef

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

    See https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#wait-long-int-

    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.InterruptedException])
    Note

    not specified by SLS as a member of AnyRef

  132. final def wait(arg0: Long): Unit

    See https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#wait-long-.

    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.InterruptedException]) @native()
    Note

    not specified by SLS as a member of AnyRef

  133. def withFilter(p: (A) => Boolean): WithFilter[A, CC]

    Creates a non-strict filter of this set.

    Creates a non-strict filter of this set.

    Note: the difference between c filter p and c withFilter p is that the former creates a new collection, whereas the latter only restricts the domain of subsequent map, flatMap, foreach, and withFilter operations.

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

    p

    the predicate used to test elements.

    returns

    an object of class WithFilter, which supports map, flatMap, foreach, and withFilter operations. All these operations apply to those elements of this set which satisfy the predicate p.

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

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

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

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

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

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

    thatElem

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

    returns

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

    Definition Classes
    IterableOps
  136. def zipWithIndex: CC[(A, Int)]

    Zips this set with its indices.

    Zips this set with its indices.

    returns

    A new set containing pairs consisting of all elements of this set 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))

  137. final def |(that: Set[A]): C

    Alias for union

    Alias for union

    Annotations
    @inline()

Shadowed Implicit Value Members

  1. def +(other: String): String
    Implicit
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Deprecated Value Members

  1. def +(elem1: A, elem2: A, elems: A*): C
    Annotations
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    Deprecated

    (Since version 2.13.0) Use ++ with an explicit collection argument instead of + with varargs

  2. def +(elem: A): C
    Annotations
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  3. def ++:[B >: A](that: IterableOnce[B]): CC[B]
    Definition Classes
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    (Since version 2.13.0) Use ++ instead of ++: for collections of type Iterable

  4. def -(elem1: A, elem2: A, elems: A*): C
    Annotations
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  5. def -(elem: A): C
    Annotations
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  6. def --(that: IterableOnce[A]): C
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  7. def /:[B](z: B)(op: (B, A) => B): B
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  8. final def /:[B](z: B)(op: (B, A) => B): B
    Definition Classes
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    @deprecated @inline()
    Deprecated

    (Since version 2.13.0) Use foldLeft instead of /:

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

    (Since version 2.13.0) Use foldRight instead of :\

  11. 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.

  12. def collectFirst[B](f: PartialFunction[A, B]): Option[B]
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  13. def companion: IterableFactory[CC]
    Definition Classes
    IterableOps
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    @deprecated @deprecatedOverriding() @inline()
    Deprecated

    (Since version 2.13.0) Use iterableFactory instead

  14. def copyToBuffer(dest: Buffer[A]): Unit
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  15. final def copyToBuffer[B >: A](dest: Buffer[B]): Unit
    Definition Classes
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    @deprecated @inline()
    Deprecated

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

  16. def count(f: (A) => Boolean): Int
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  17. def exists(f: (A) => Boolean): Boolean
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  18. def filter(f: (A) => Boolean): Iterator[A]
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  19. def find(p: (A) => Boolean): Option[A]
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  20. def flatMap[B](f: (A) => IterableOnce[B]): IterableOnce[B]
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  21. def fold[A1 >: A](z: A1)(op: (A1, A1) => A1): A1
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  22. def foldLeft[B](z: B)(op: (B, A) => B): B
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  23. def foldRight[B](z: B)(op: (A, B) => B): B
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  24. def forall(f: (A) => Boolean): Boolean
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  25. def foreach[U](f: (A) => U): Unit
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  26. def formatted(fmtstr: String): String

    Returns string formatted according to given format string.

    Returns string formatted according to given format string. Format strings are as for String.format (@see java.lang.String.format).

    Implicit
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    Definition Classes
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    Deprecated

    (Since version 2.12.16) Use formatString.format(value) instead of value.formatted(formatString), or use the f"" string interpolator. In Java 15 and later, formatted resolves to the new method in String which has reversed parameters.

  27. def hasDefiniteSize: Boolean

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

    Tests whether this set 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
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    @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

  28. def isEmpty: Boolean
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  29. def map[B](f: (A) => B): IterableOnce[B]
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  30. def max(implicit ord: math.Ordering[A]): A
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  31. def maxBy[B](f: (A) => B)(implicit cmp: math.Ordering[B]): A
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  32. def min(implicit ord: math.Ordering[A]): A
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  33. def minBy[B](f: (A) => B)(implicit cmp: math.Ordering[B]): A
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  34. def mkString: String
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  35. def mkString(sep: String): String
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  36. def mkString(start: String, sep: String, end: String): String
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  37. def nonEmpty: Boolean
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  38. def product(implicit num: math.Numeric[A]): A
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  39. def reduce(f: (A, A) => A): A
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  40. def reduceLeft(f: (A, A) => A): A
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  41. def reduceLeftOption(f: (A, A) => A): Option[A]
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  42. def reduceOption(f: (A, A) => A): Option[A]
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  43. def reduceRight(f: (A, A) => A): A
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  44. def reduceRightOption(f: (A, A) => A): Option[A]
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  45. final def repr: C
    Definition Classes
    IterableOps
    Annotations
    @deprecated
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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

  46. def sameElements[B >: A](that: IterableOnce[B]): Boolean
    Implicit
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  47. def size: Int
    Implicit
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  48. def sum(implicit num: math.Numeric[A]): A
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  49. def to[C1](factory: Factory[A, C1]): C1
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  50. def toArray[B >: A](implicit arg0: ClassTag[B]): Array[B]
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  51. def toBuffer[B >: A]: Buffer[B]
    Implicit
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  52. def toIndexedSeq: IndexedSeq[A]
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  53. final def toIterable: Iterable[A]
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  54. def toIterator: Iterator[A]
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  55. final def toIterator: Iterator[A]
    Definition Classes
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    (Since version 2.13.0) Use .iterator instead of .toIterator

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

  62. final def toTraversable: Traversable[A]
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  63. final def toTraversable: Traversable[A]

    Converts this set to an unspecified Iterable.

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

    returns

    An Iterable containing all elements of this set.

    Definition Classes
    IterableOps
    Annotations
    @deprecated
    Deprecated

    (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

  64. def toVector: immutable.Vector[A]
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  65. 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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    Annotations
    @deprecated
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    (Since version 2.13.0) Use .view.slice(from, until) instead of .view(from, until)

  66. def withFilter(f: (A) => Boolean): Iterator[A]
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  67. def [B](y: B): (SetOps[A, CC, C], B)
    Implicit
    This member is added by an implicit conversion from SetOps[A, CC, C] toArrowAssoc[SetOps[A, CC, C]] performed by method ArrowAssoc in scala.Predef.
    Definition Classes
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    Annotations
    @deprecated
    Deprecated

    (Since version 2.13.0) Use -> instead. If you still wish to display it as one character, consider using a font with programming ligatures such as Fira Code.

Inherited from (A) => Boolean

Inherited from IterableOps[A, CC, C]

Inherited from IterableOnceOps[A, CC, C]

Inherited from IterableOnce[A]

Inherited from AnyRef

Inherited from Any

Inherited by implicit conversion iterableOnceExtensionMethods fromSetOps[A, CC, C] to IterableOnceExtensionMethods[A]

Inherited by implicit conversion any2stringadd fromSetOps[A, CC, C] to any2stringadd[SetOps[A, CC, C]]

Inherited by implicit conversion StringFormat fromSetOps[A, CC, C] to StringFormat[SetOps[A, CC, C]]

Inherited by implicit conversion Ensuring fromSetOps[A, CC, C] to Ensuring[SetOps[A, CC, C]]

Inherited by implicit conversion ArrowAssoc fromSetOps[A, CC, C] to ArrowAssoc[SetOps[A, CC, C]]

Ungrouped