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class ImmutableKeySet extends AbstractSet[K] with GenKeySet with DefaultSerializable

The implementation class of the set returned by keySet

Attributes
protected[immutable]
Source
Map.scala
Type Hierarchy
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Inherited
  1. ImmutableKeySet
  2. DefaultSerializable
  3. Serializable
  4. GenKeySet
  5. AbstractSet
  6. Set
  7. SetOps
  8. Iterable
  9. AbstractSet
  10. Set
  11. Equals
  12. SetOps
  13. Function1
  14. AbstractIterable
  15. Iterable
  16. IterableFactoryDefaults
  17. IterableOps
  18. IterableOnceOps
  19. IterableOnce
  20. AnyRef
  21. 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

Instance Constructors

  1. new ImmutableKeySet()

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: collection.Set[K]): Set[K]

    Alias for intersect

    Alias for intersect

    Definition Classes
    SetOps
    Annotations
    @inline()
  4. final def &~(that: collection.Set[K]): Set[K]

    Alias for diff

    Alias for diff

    Definition Classes
    SetOps
    Annotations
    @inline()
  5. final def +(elem: K): Set[K]

    Alias for incl

    Alias for incl

    Definition Classes
    SetOpsSetOps
  6. final def ++(that: IterableOnce[K]): Set[K]

    Alias for concat

    Alias for concat

    Definition Classes
    SetOps
    Annotations
    @inline()
  7. final def ++[B >: K](suffix: IterableOnce[B]): Set[B]

    Alias for concat

    Alias for concat

    Definition Classes
    IterableOps
    Annotations
    @inline()
  8. final def -(elem: K): Set[K]

    Alias for excl

    Alias for excl

    Definition Classes
    SetOpsSetOps
    Annotations
    @inline()
  9. final def --(that: IterableOnce[K]): Set[K]

    Alias for removedAll

    Alias for removedAll

    Definition Classes
    SetOpsSetOps
  10. def ->[B](y: B): (ImmutableKeySet, B)
    Implicit
    This member is added by an implicit conversion from ImmutableKeySet toArrowAssoc[ImmutableKeySet] performed by method ArrowAssoc in scala.Predef.
    Definition Classes
    ArrowAssoc
    Annotations
    @inline()
  11. 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
  12. final def addString(b: mutable.StringBuilder): b.type

    Appends all elements of this immutable set to a string builder.

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

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

    Appends all elements of this immutable 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 immutable 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()
  14. def addString(b: mutable.StringBuilder, start: String, sep: String, end: String): b.type

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

    Appends all elements of this immutable 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 immutable 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
  15. def andThen[A](g: (Boolean) => A): (K) => 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()
  16. final def apply(elem: K): 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()
  17. final def asInstanceOf[T0]: T0

    Forces the compiler to treat the receiver object as having type T0, even though doing so may violate type safety.

    Forces the compiler to treat the receiver object as having type T0, even though doing so may violate type safety.

    This method is useful when you believe you have type information the compiler doesn't, and it also isn't possible to check the type at runtime. In such situations, skipping type safety is the only option.

    It is platform dependent whether asInstanceOf has any effect at runtime. It might do a runtime type test on the erasure of T0, insert a conversion (such as boxing/unboxing), fill in a default value, or do nothing at all.

    In particular, asInstanceOf is not a type test. It does **not** mean:

    this match {
     case x: T0 => x
     case _     => throw ClassCastException("...")

    Use pattern matching or isInstanceOf for type testing instead.

    Situations where asInstanceOf is useful:

    • when flow analysis fails to deduce T0 automatically
    • when down-casting a type parameter or an abstract type member (which cannot be checked at runtime due to type erasure) If there is any doubt and you are able to type test instead, you should do so.

    Be careful of using asInstanceOf when T0 is a primitive type. When T0 is primitive, asInstanceOf may insert a conversion instead of a type test. If your intent is to convert, use a toT method (x.toChar, x.toByte, etc.).

    returns

    the receiver object.

    Definition Classes
    Any
    Exceptions thrown

    ClassCastException if the receiver is not an instance of the erasure of T0, if that can be checked on this platform

  18. def canEqual(that: Any): Boolean

    Checks whether this instance can possibly equal that.

    Checks whether this instance can possibly equal that.

    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
    SetEquals
  19. def className: String

    Defines the prefix of this object's toString representation.

    Defines the prefix of this object's toString representation.

    It is recommended to return the name of the concrete collection type, but not implementation subclasses. For example, for ListMap this method should return "ListMap", not "Map" (the supertype) or "Node" (an implementation subclass).

    The default implementation returns "Iterable". It is overridden for the basic collection kinds "Seq", "IndexedSeq", "LinearSeq", "Buffer", "Set", "Map", "SortedSet", "SortedMap" and "View".

    returns

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

    Attributes
    protected[this]
    Definition Classes
    Iterable
  20. 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

  21. final def coll: ImmutableKeySet.this.type

    returns

    This collection as a C.

    Attributes
    protected
    Definition Classes
    IterableIterableOps
  22. def collect[B](pf: PartialFunction[K, B]): Set[B]

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

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

    B

    the element type of the returned immutable set.

    pf

    the partial function which filters and maps the immutable set.

    returns

    a new immutable 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
  23. def collectFirst[B](pf: PartialFunction[K, B]): Option[B]

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

    Finds the first element of the immutable 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)

  24. def compose[A](g: (A) => K): (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()
  25. def concat(that: IterableOnce[K]): Set[K]

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

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

    This method takes a collection of elements and adds all elements, omitting duplicates, into immutable 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 immutable set with the given elements added, omitting duplicates.

    Definition Classes
    SetOps
  26. def concat[B >: K](suffix: IterableOnce[B]): Set[B]

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

    Returns a new immutable set containing the elements from the left hand operand followed by the elements from the right hand operand. The element type of the immutable set 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 immutable set which contains all elements of this immutable set followed by all elements of suffix.

    Definition Classes
    IterableOps
  27. def contains(key: K): Boolean
    Definition Classes
    GenKeySet
  28. def copyToArray[B >: K](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 immutable set.

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

  29. def copyToArray[B >: K](xs: Array[B], start: Int): Int

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

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

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

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

  30. def copyToArray[B >: K](xs: Array[B]): Int

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

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

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

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

  31. def corresponds[B](that: IterableOnce[B])(p: (K, 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
  32. def count(p: (K) => Boolean): Int

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

    Counts the number of elements in the immutable 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
  33. def diff(that: collection.Set[K]): Set[K]

    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.

    Definition Classes
    SetOpsSetOps
  34. def drop(n: Int): Set[K]

    Selects all elements except the first n ones.

    Selects all elements except the 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 immutable set.

    returns

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

    Definition Classes
    IterableOpsIterableOnceOps
  35. def dropRight(n: Int): Set[K]

    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 immutable set.

    returns

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

    Definition Classes
    IterableOps
  36. def dropWhile(p: (K) => Boolean): Set[K]

    Selects all elements except the longest prefix that satisfies a predicate.

    Selects all elements except the longest prefix that satisfies a predicate.

    The matching prefix starts with the first element of this immutable set, and the element following the prefix is the first element that does not satisfy the predicate. The matching prefix may be empty, so that this method returns the entire immutable set.

    Example:

    scala> List(1, 2, 3, 100, 4).dropWhile(n => n < 10)
    val res0: List[Int] = List(100, 4)
    
    scala> List(1, 2, 3, 100, 4).dropWhile(n => n == 0)
    val res1: List[Int] = List(1, 2, 3, 100, 4)

    Use span to obtain both the prefix and suffix. Use filterNot to drop all elements that satisfy the 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 immutable set whose first element does not satisfy the predicate p.

    Definition Classes
    IterableOpsIterableOnceOps
  37. def empty: Set[K]

    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
  38. def ensuring(cond: (ImmutableKeySet) => Boolean, msg: => Any): ImmutableKeySet
    Implicit
    This member is added by an implicit conversion from ImmutableKeySet toEnsuring[ImmutableKeySet] performed by method Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  39. def ensuring(cond: (ImmutableKeySet) => Boolean): ImmutableKeySet
    Implicit
    This member is added by an implicit conversion from ImmutableKeySet toEnsuring[ImmutableKeySet] performed by method Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  40. def ensuring(cond: Boolean, msg: => Any): ImmutableKeySet
    Implicit
    This member is added by an implicit conversion from ImmutableKeySet toEnsuring[ImmutableKeySet] performed by method Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  41. def ensuring(cond: Boolean): ImmutableKeySet
    Implicit
    This member is added by an implicit conversion from ImmutableKeySet toEnsuring[ImmutableKeySet] performed by method Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  42. 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
  43. def equals(that: Any): Boolean

    Equality of sets is implemented using the lookup method contains.

    Equality of sets is implemented using the lookup method contains. This method returns true if

    • the argument that is a Set,
    • the two sets have the same size, and
    • for every element this set, other.contains(element) == true.

    The implementation of equals checks the canEqual method, so subclasses of Set can narrow down the equality to specific set types. The Set implementations in the standard library can all be compared, their canEqual methods return true.

    Note: The equals method only respects the equality laws (symmetry, transitivity) if the two sets use the same element equivalence function in their lookup operation. For example, the element equivalence operation in a scala.collection.immutable.TreeSet is defined by its ordering. Comparing a TreeSet with a HashSet leads to unexpected results if ordering.equiv(e1, e2) (used for lookup in TreeSet) is different from e1 == e2 (used for lookup in HashSet).

    scala> import scala.collection.immutable._
    scala> val ord: Ordering[String] = _ compareToIgnoreCase _
    
    scala> TreeSet("A")(ord) == HashSet("a")
    val res0: Boolean = false
    
    scala> HashSet("a") == TreeSet("A")(ord)
    val res1: Boolean = true
    that

    The set to which this set is compared

    returns

    true if the two sets are equal according to the description

    Definition Classes
    SetEquals → AnyRef → Any
  44. def excl(elem: K): Set[K]

    Creates a new set with a given element removed from this set.

    Creates a new set with a given element removed from this set.

    elem

    the element to be removed

    returns

    a new set that contains all elements of this set but that does not contain elem.

    Definition Classes
    ImmutableKeySetSetOps
  45. def exists(p: (K) => Boolean): Boolean

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

    Tests whether a predicate holds for at least one element of this immutable 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 immutable set, otherwise false

    Definition Classes
    IterableOnceOps
  46. def filter(pred: (K) => Boolean): Set[K]

    Selects all elements of this immutable set which satisfy a predicate.

    Selects all elements of this immutable set which satisfy a predicate.

    returns

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

    Definition Classes
    IterableOpsIterableOnceOps
  47. def filterNot(pred: (K) => Boolean): Set[K]

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

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

    pred

    the predicate used to test elements.

    returns

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

    Definition Classes
    IterableOpsIterableOnceOps
  48. 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

  49. def find(p: (K) => Boolean): Option[K]

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

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

    Definition Classes
    IterableOnceOps
  50. def flatMap[B](f: (K) => IterableOnce[B]): Set[B]

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

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

    Definition Classes
    IterableOpsIterableOnceOps
  51. def flatten[B](implicit asIterable: (K) => IterableOnce[B]): Set[B]

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

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

    The resulting collection's type will be guided by the type of immutable 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 iterable collection.

    asIterable

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

    returns

    a new immutable set resulting from concatenating all element immutable sets.

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

    Applies the given binary operator op to the given initial value z and all elements of this immutable set.

    Applies the given binary operator op to the given initial value z and all elements of this immutable set.

    For each application of the operator, each operand is either an element of this immutable set, the initial value, or another such application of the operator.

    The order of applications of the operator is unspecified and may be nondeterministic. Each element appears exactly once in the computation. The initial value may be used an arbitrary number of times, but at least once.

    If this collection is ordered, then for any application of the operator, the element(s) appearing in the left operand will precede those in the right.

    Note: might return different results for different runs, unless either of the following conditions is met: (1) the operator is associative, and the underlying collection type is ordered; or (2) the operator is associative and commutative. In either case, it is also necessary that the initial value be a neutral value for the operator, e.g. Nil for List concatenation or 1 for multiplication.

    The default implementation in IterableOnce is equivalent to foldLeft but may be overridden for more efficient traversal orders.

    Note: will not terminate for infinite-sized collections.

    A1

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

    z

    An initial value; may be used an arbitrary number of times in the computation of the result; must be a neutral value for op for the result to always be the same across runs.

    op

    A binary operator; must be associative for the result to always be the same across runs.

    returns

    The result of applying op between all the elements and z, or z if this immutable set is empty.

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

    Applies the given binary operator op to the given initial value z and all elements of this immutable set, going left to right.

    Applies the given binary operator op to the given initial value z and all elements of this immutable set, going left to right. Returns the initial value if this immutable set is empty.

    "Going left to right" only makes sense if this collection is ordered: then if x1, x2, ..., xn are the elements of this immutable set, the result is op( op( ... op( op(z, x1), x2) ... ), xn).

    If this collection is not ordered, then for each application of the operator, each right operand is an element. In addition, the leftmost operand is the initial value, and each other left operand is itself an application of the operator. The elements of this immutable set and the initial value all appear exactly once in the computation.

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

    Note: will not terminate for infinite-sized collections.

    B

    The result type of the binary operator.

    z

    An initial value.

    op

    A binary operator.

    returns

    The result of applying op to z and all elements of this immutable set, going left to right. Returns z if this immutable set is empty.

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

    Applies the given binary operator op to all elements of this immutable set and the given initial value z, going right to left.

    Applies the given binary operator op to all elements of this immutable set and the given initial value z, going right to left. Returns the initial value if this immutable set is empty.

    "Going right to left" only makes sense if this collection is ordered: then if x1, x2, ..., xn are the elements of this immutable set, the result is op(x1, op(x2, op( ... op(xn, z) ... ))).

    If this collection is not ordered, then for each application of the operator, each left operand is an element. In addition, the rightmost operand is the initial value, and each other right operand is itself an application of the operator. The elements of this immutable set and the initial value all appear exactly once in the computation.

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

    Note: will not terminate for infinite-sized collections.

    B

    The result type of the binary operator.

    z

    An initial value.

    op

    A binary operator.

    returns

    The result of applying op to all elements of this immutable set and z, going right to left. Returns z if this immutable set is empty.

    Definition Classes
    IterableOnceOps
  55. def forall(p: (K) => Boolean): Boolean

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

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

    Note: may not terminate for infinite-sized collections.

    p

    the predicate used to test elements.

    returns

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

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

    Applies f to each element for its side effects.

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

    Definition Classes
    IterableOnceOps
  57. def fromSpecific(coll: IterableOnce[K]): Set[K]

    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
    IterableFactoryDefaultsIterableOps
    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.

  58. 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()
  59. def groupBy[K](f: (K) => K): Map[K, Set[K]]

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

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

    Definition Classes
    IterableOps
  60. def groupMap[K, B](key: (K) => K)(f: (K) => B): Map[K, Set[B]]

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

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

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

    Partitions this immutable 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
  62. def grouped(size: Int): Iterator[Set[K]]

    Partitions elements in fixed size immutable sets.

    Partitions elements in fixed size immutable sets.

    size

    the number of elements per group

    returns

    An iterator producing immutable 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

  63. 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
    Set → AnyRef → Any
  64. def head: K

    Selects the first element of this immutable set.

    Selects the first element of this immutable set.

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

    returns

    the first element of this immutable set.

    Definition Classes
    IterableOps
    Exceptions thrown

    NoSuchElementException if the immutable set is empty.

  65. def headOption: Option[K]

    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 immutable set if it is nonempty, None if it is empty.

    Definition Classes
    IterableOps
  66. def incl(elem: K): Set[K]

    Creates a new set with an additional element, unless the element is already present.

    Creates a new set with an additional element, unless the element is already present.

    elem

    the element to be added

    returns

    a new set that contains all elements of this set and that also contains elem.

    Definition Classes
    ImmutableKeySetSetOps
  67. def init: Set[K]

    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
  68. def inits: Iterator[Set[K]]

    Iterates over the inits of this immutable set.

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

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

  69. def intersect(that: collection.Set[K]): Set[K]

    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.

    Definition Classes
    SetOps
  70. def isEmpty: Boolean
    Definition Classes
    GenKeySet
  71. 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.

  72. def isTraversableAgain: Boolean

    Tests whether this immutable set can be repeatedly traversed.

    Tests whether this immutable 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
  73. def iterableFactory: IterableFactory[Set]

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

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

    Definition Classes
    SetSetIterableIterableIterableOps
    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).

  74. def iterator: Iterator[K]
    Definition Classes
    GenKeySet
  75. def knownSize: Int
    Definition Classes
    GenKeySet
  76. def last: K

    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 immutable set.

    Definition Classes
    IterableOps
    Exceptions thrown

    NoSuchElementException If the immutable set is empty.

  77. def lastOption: Option[K]

    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 immutable set$ if it is nonempty, None if it is empty.

    Definition Classes
    IterableOps
  78. def lazyZip[B](that: collection.Iterable[B]): LazyZip2[K, B, ImmutableKeySet.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
  79. def map[B](f: (K) => B): Set[B]

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

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

    B

    the element type of the returned immutable set.

    f

    the function to apply to each element.

    returns

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

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

    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 immutable set with respect to the ordering ord.

    Definition Classes
    IterableOnceOps
    Exceptions thrown

    UnsupportedOperationException if this immutable set is empty.

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

    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 immutable set with the largest value measured by function f with respect to the ordering cmp.

    Definition Classes
    IterableOnceOps
    Exceptions thrown

    UnsupportedOperationException if this immutable set is empty.

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

    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 immutable set with the largest value measured by function f with respect to the ordering cmp.

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

    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 immutable set with respect to the ordering ord.

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

    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 immutable set with respect to the ordering ord.

    Definition Classes
    IterableOnceOps
    Exceptions thrown

    UnsupportedOperationException if this immutable set is empty.

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

    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 immutable set with the smallest value measured by function f with respect to the ordering cmp.

    Definition Classes
    IterableOnceOps
    Exceptions thrown

    UnsupportedOperationException if this immutable set is empty.

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

    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 immutable set with the smallest value measured by function f with respect to the ordering cmp.

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

    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 immutable set with respect to the ordering ord.

    Definition Classes
    IterableOnceOps
  88. final def mkString: String

    Displays all elements of this immutable set in a string.

    Displays all elements of this immutable set in a string.

    Delegates to addString, which can be overridden.

    returns

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

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

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

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

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

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

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

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

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

  91. 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
  92. def newSpecificBuilder: Builder[K, Set[K]]

    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
    IterableFactoryDefaultsIterableOps
    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.

  93. def nonEmpty: Boolean

    Tests whether the immutable set is not empty.

    Tests whether the immutable set is not empty.

    returns

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

    Definition Classes
    IterableOnceOps
    Annotations
    @deprecatedOverriding()
  94. 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

  95. 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

  96. def partition(p: (K) => Boolean): (Set[K], Set[K])

    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.

    The two immutable set correspond to the result of filter and filterNot, respectively.

    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
  97. def partitionMap[A1, A2](f: (K) => Either[A1, A2]): (Set[A1], Set[A2])

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

    returns

    a pair of immutable 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
  98. def product[B >: K](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 immutable set with respect to the * operator in num.

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

    Applies the given binary operator op to all elements of this immutable set.

    Applies the given binary operator op to all elements of this immutable set.

    For each application of the operator, each operand is either an element of this immutable set or another such application of the operator. The order of applications of the operator is unspecified and may be nondeterministic. Each element appears exactly once in the computation.

    If this collection is ordered, then for any application of the operator, the element(s) appearing in the left operand will precede those in the right.

    Note: might return different results for different runs, unless either of the following conditions is met: (1) the operator is associative, and the underlying collection type is ordered; or (2) the operator is associative and commutative.

    Note: will not terminate for infinite-sized collections.

    B

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

    op

    A binary operator; must be associative for the result to always be the same across runs.

    returns

    The result of applying op between all the elements if the immutable set is nonempty.

    Definition Classes
    IterableOnceOps
    Exceptions thrown

    UnsupportedOperationException if this immutable set is empty.

  100. def reduceLeft[B >: K](op: (B, K) => B): B

    Applies the given binary operator op to all elements of this immutable set, going left to right.

    Applies the given binary operator op to all elements of this immutable set, going left to right.

    "Going left to right" only makes sense if this collection is ordered: then if x1, x2, ..., xn are the elements of this immutable set, the result is op( op( op( ... op(x1, x2) ... ), xn-1), xn).

    If this collection is not ordered, then for each application of the operator, each right operand is an element. In addition, the leftmost operand is the first element of this immutable set and each other left operand is itself an application of the operator. Each element appears exactly once in the computation.

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

    Note: will not terminate for infinite-sized collections.

    B

    The result type of the binary operator, a supertype of A.

    op

    A binary operator.

    returns

    The result of applying op to all elements of this immutable set, going left to right.

    Definition Classes
    IterableOnceOps
    Exceptions thrown

    UnsupportedOperationException if this immutable set is empty.

  101. def reduceLeftOption[B >: K](op: (B, K) => B): Option[B]

    If this immutable set is nonempty, reduces it with the given binary operator op, going left to right.

    If this immutable set is nonempty, reduces it with the given binary operator op, going left to right.

    The behavior is the same as reduceLeft except that the value is None if the immutable set is empty. Each element appears exactly once in the computation.

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

    Note: will not terminate for infinite-sized collections.

    B

    The result type of the binary operator, a supertype of A.

    op

    A binary operator.

    returns

    The result of reducing this immutable set with op going left to right if the immutable set is nonempty, inside a Some, and None otherwise.

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

    If this immutable set is nonempty, reduces it with the given binary operator op.

    If this immutable set is nonempty, reduces it with the given binary operator op.

    The behavior is the same as reduce except that the value is None if the immutable set is empty. The order of applications of the operator is unspecified and may be nondeterministic. Each element appears exactly once in the computation.

    Note: might return different results for different runs, unless either of the following conditions is met: (1) the operator is associative, and the underlying collection type is ordered; or (2) the operator is associative and commutative.

    Note: will not terminate for infinite-sized collections.

    B

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

    op

    A binary operator; must be associative for the result to always be the same across runs.

    returns

    The result of reducing this immutable set with op if the immutable set is nonempty, inside a Some, and None otherwise.

    Definition Classes
    IterableOnceOps
  103. def reduceRight[B >: K](op: (K, B) => B): B

    Applies the given binary operator op to all elements of this immutable set, going right to left.

    Applies the given binary operator op to all elements of this immutable set, going right to left.

    "Going right to left" only makes sense if this collection is ordered: then if x1, x2, ..., xn are the elements of this immutable set, the result is op(x1, op(x2, op( ... op(xn-1, xn) ... ))).

    If this collection is not ordered, then for each application of the operator, each left operand is an element. In addition, the rightmost operand is the last element of this immutable set and each other right operand is itself an application of the operator. Each element appears exactly once in the computation.

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

    Note: will not terminate for infinite-sized collections.

    B

    The result type of the binary operator, a supertype of A.

    op

    A binary operator.

    returns

    The result of applying op to all elements of this immutable set, going right to left.

    Definition Classes
    IterableOnceOps
    Exceptions thrown

    UnsupportedOperationException if this immutable set is empty.

  104. def reduceRightOption[B >: K](op: (K, B) => B): Option[B]

    If this immutable set is nonempty, reduces it with the given binary operator op, going right to left.

    If this immutable set is nonempty, reduces it with the given binary operator op, going right to left.

    The behavior is the same as reduceRight except that the value is None if the immutable set is empty. Each element appears exactly once in the computation.

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

    Note: will not terminate for infinite-sized collections.

    B

    The result type of the binary operator, a supertype of A.

    op

    A binary operator.

    returns

    The result of reducing this immutable set with op going right to left if the immutable set is nonempty, inside a Some, and None otherwise.

    Definition Classes
    IterableOnceOps
  105. def removedAll(that: IterableOnce[K]): Set[K]

    Creates a new immutable set from this immutable set by removing all elements of another collection.

    Creates a new immutable set from this immutable set by removing all elements of another collection.

    that

    the collection containing the elements to remove.

    returns

    a new immutable set with the given elements removed, omitting duplicates.

    Definition Classes
    SetOps
  106. def reversed: collection.Iterable[K]
    Attributes
    protected
    Definition Classes
    IterableOnceOps
  107. def scan[B >: K](z: B)(op: (B, B) => B): Set[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 immutable set containing the prefix scan of the elements in this immutable set

    Definition Classes
    IterableOps
  108. def scanLeft[B](z: B)(op: (B, K) => B): Set[B]

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

    Produces a immutable 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
  109. def scanRight[B](z: B)(op: (K, B) => B): Set[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
  110. def size: Int
    Definition Classes
    GenKeySet
  111. def sizeCompare(that: collection.Iterable[_]): Int

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

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

    that

    the Iterable whose size is compared with this immutable 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
  112. def sizeCompare(otherSize: Int): Int

    Compares the size of this immutable set to a test value.

    Compares the size of this immutable 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

  113. final def sizeIs: SizeCompareOps

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

    Returns a value class containing operations for comparing the size of this immutable 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()
  114. def slice(from: Int, until: Int): Set[K]

    Selects an interval of elements.

    Selects an interval of elements. The returned immutable 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 immutable set.

    until

    the lowest index to EXCLUDE from this immutable set.

    returns

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

    Definition Classes
    IterableOpsIterableOnceOps
  115. def sliding(size: Int, step: Int): Iterator[Set[K]]

    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 immutable 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

  116. def sliding(size: Int): Iterator[Set[K]]

    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 immutable 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

  117. def span(p: (K) => Boolean): (Set[K], Set[K])

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

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

    Definition Classes
    IterableOpsIterableOnceOps
  118. def splitAt(n: Int): (Set[K], Set[K])

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

    Splits this immutable 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 immutable sets consisting of the first n elements of this immutable set, and the other elements.

    Definition Classes
    IterableOpsIterableOnceOps
  119. def stepper[S <: Stepper[_]](implicit shape: StepperShape[K, 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
  120. def stringPrefix: String
    Attributes
    protected[this]
    Definition Classes
    SetIterable
    Annotations
    @nowarn()
  121. def subsetOf(that: collection.Set[K]): 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.

    Definition Classes
    SetOps
  122. def subsets(): Iterator[Set[K]]

    An iterator over all subsets of this set.

    An iterator over all subsets of this set.

    returns

    the iterator.

    Definition Classes
    SetOps
  123. def subsets(len: Int): Iterator[Set[K]]

    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.

    Definition Classes
    SetOps
  124. def sum[B >: K](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 immutable set with respect to the + operator in num.

    Definition Classes
    IterableOnceOps
  125. 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
  126. def tail: Set[K]

    The rest of the collection without its first element.

    The rest of the collection without its first element.

    Definition Classes
    IterableOps
  127. def tails: Iterator[Set[K]]

    Iterates over the tails of this immutable set.

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

    returns

    an iterator over all the tails of this immutable set

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

  128. def take(n: Int): Set[K]

    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 immutable set.

    returns

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

    Definition Classes
    IterableOpsIterableOnceOps
  129. def takeRight(n: Int): Set[K]

    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 immutable set.

    returns

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

    Definition Classes
    IterableOps
  130. def takeWhile(p: (K) => Boolean): Set[K]

    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 immutable set whose elements all satisfy the predicate p.

    Definition Classes
    IterableOpsIterableOnceOps
  131. def tapEach[U](f: (K) => U): Set[K]

    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 immutable set

    returns

    The same logical collection as this

    Definition Classes
    IterableOpsIterableOnceOps
  132. def to[C1](factory: Factory[K, C1]): C1

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

    Given a collection factory factory, converts this immutable set 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
  133. def toArray[B >: K](implicit arg0: ClassTag[B]): Array[B]

    Converts this immutable set to an Array.

    Converts this immutable set to an Array.

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

    B

    The type of elements of the result, a supertype of A.

    returns

    This immutable set as an Array[B].

    Definition Classes
    IterableOnceOps
  134. final def toBuffer[B >: K]: Buffer[B]

    Converts this immutable set to a Buffer.

    Converts this immutable set to a Buffer.

    B

    The type of elements of the result, a supertype of A.

    returns

    This immutable set as a Buffer[B].

    Definition Classes
    IterableOnceOps
    Annotations
    @inline()
  135. def toIndexedSeq: IndexedSeq[K]

    Converts this immutable set to an IndexedSeq.

    Converts this immutable set to an IndexedSeq.

    returns

    This immutable set as an IndexedSeq[A].

    Definition Classes
    IterableOnceOps
  136. def toList: List[K]

    Converts this immutable set to a List.

    Converts this immutable set to a List.

    returns

    This immutable set as a List[A].

    Definition Classes
    IterableOnceOps
  137. def toMap[K, V](implicit ev: <:<[K, (K, V)]): Map[K, V]

    Converts this immutable set to a Map, given an implicit coercion from the immutable set's type to a key-value tuple.

    Converts this immutable set to a Map, given an implicit coercion from the immutable set's type to a key-value tuple.

    K

    The key type for the resulting map.

    V

    The value type for the resulting map.

    ev

    An implicit coercion from A to [K, V].

    returns

    This immutable set as a Map[K, V].

    Definition Classes
    IterableOnceOps
  138. def toSeq: Seq[K]

    returns

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

    Definition Classes
    IterableOnceOps
  139. def toSet[B >: K]: Set[B]

    Converts this immutable set to a Set.

    Converts this immutable set to a Set.

    B

    The type of elements of the result, a supertype of A.

    returns

    This immutable set as a Set[B].

    Definition Classes
    IterableOnceOps
  140. 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
    SetFunction1Iterable → AnyRef → Any
  141. def toVector: Vector[K]

    Converts this immutable set to a Vector.

    Converts this immutable set to a Vector.

    returns

    This immutable set as a Vector[A].

    Definition Classes
    IterableOnceOps
  142. def transpose[B](implicit asIterable: (K) => collection.Iterable[B]): Set[Set[B]]

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

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

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

    returns

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

    Definition Classes
    IterableOps
    Exceptions thrown

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

  143. final def union(that: collection.Set[K]): Set[K]

    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.

    Definition Classes
    SetOps
    Annotations
    @inline()
  144. def unzip[A1, A2](implicit asPair: (K) => (A1, A2)): (Set[A1], Set[A2])

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

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

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

    returns

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

    Definition Classes
    IterableOps
  145. def unzip3[A1, A2, A3](implicit asTriple: (K) => (A1, A2, A3)): (Set[A1], Set[A2], Set[A3])

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

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

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

    returns

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

    Definition Classes
    IterableOps
  146. def view: View[K]

    A view over the elements of this collection.

    A view over the elements of this collection.

    Definition Classes
    IterableOps
  147. 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

  148. 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

  149. 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

  150. def withFilter(p: (K) => Boolean): WithFilter[K, [_]Set[_]]

    Creates a non-strict filter of this immutable set.

    Creates a non-strict filter of this immutable 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 immutable set which satisfy the predicate p.

    Definition Classes
    IterableOps
  151. def writeReplace(): AnyRef
    Attributes
    protected[this]
    Definition Classes
    DefaultSerializable
  152. def zip[B](that: IterableOnce[B]): Set[(K, B)]

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

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

    Definition Classes
    IterableOps
  153. def zipAll[A1 >: K, B](that: collection.Iterable[B], thisElem: A1, thatElem: B): Set[(A1, B)]

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

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

    thatElem

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

    returns

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

    Definition Classes
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  154. def zipWithIndex: Set[(K, Int)]

    Zips this immutable set with its indices.

    Zips this immutable set with its indices.

    returns

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

  155. final def |(that: collection.Set[K]): Set[K]

    Alias for union

    Alias for union

    Definition Classes
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Shadowed Implicit Value Members

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

  1. def +(elem1: K, elem2: K, elems: K*): Set[K]
    Definition Classes
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    (Since version 2.13.0) Use ++ with an explicit collection argument instead of + with varargs

  2. def ++:[B >: K](that: IterableOnce[B]): Set[B]
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  3. def -(elem1: K, elem2: K, elems: K*): Set[K]
    Definition Classes
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  4. def /:[B](z: B)(op: (B, K) => B): B
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  5. final def /:[B](z: B)(op: (B, K) => B): B
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  6. def :\[B](z: B)(op: (K, B) => B): B
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  7. final def :\[B](z: B)(op: (K, B) => B): B
    Definition Classes
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  8. def aggregate[B](z: => B)(seqop: (B, K) => B, combop: (B, B) => B): B

    Aggregates the results of applying an operator to subsequent elements.

    Aggregates the results of applying an operator to subsequent elements.

    Since this method degenerates to foldLeft for sequential (non-parallel) collections, where the combining operation is ignored, it is advisable to prefer foldLeft for that case.

    For parallel collections, use the aggregate method specified by scala.collection.parallel.ParIterableLike.

    B

    the result type, produced by seqop, combop, and by this function as a final result.

    z

    the start value, a neutral element for seqop.

    seqop

    the binary operator used to accumulate the result.

    combop

    an associative operator for combining sequential results, unused for sequential collections.

    Definition Classes
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    Annotations
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    Deprecated

    (Since version 2.13.0) For sequential collections, prefer foldLeft(z)(seqop). For parallel collections, use ParIterableLike#aggregate.

  9. def collectFirst[B](f: PartialFunction[K, B]): Option[B]
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  10. def companion: IterableFactory[[_]Set[_]]
    Definition Classes
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  11. def copyToBuffer(dest: Buffer[K]): Unit
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  12. final def copyToBuffer[B >: K](dest: Buffer[B]): Unit
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  13. def count(f: (K) => Boolean): Int
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  14. def exists(f: (K) => Boolean): Boolean
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  15. def filter(f: (K) => Boolean): Iterator[K]
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  16. def find(p: (K) => Boolean): Option[K]
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  17. def flatMap[B](f: (K) => IterableOnce[B]): IterableOnce[B]
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  18. def fold[A1 >: A](z: A1)(op: (A1, A1) => A1): A1
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  19. def foldLeft[B](z: B)(op: (B, K) => B): B
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  20. def foldRight[B](z: B)(op: (K, B) => B): B
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  21. def forall(f: (K) => Boolean): Boolean
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  22. def foreach[U](f: (K) => U): Unit
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  23. 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
    This member is added by an implicit conversion from ImmutableKeySet toStringFormat[ImmutableKeySet] performed by method StringFormat in scala.Predef.
    Definition Classes
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    @deprecated @inline()
    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.

  24. def hasDefiniteSize: Boolean

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

    Tests whether this immutable 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
    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

  25. def isEmpty: Boolean
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  26. def map[B](f: (K) => B): IterableOnce[B]
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  27. def max(implicit ord: math.Ordering[K]): K
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  28. def maxBy[B](f: (K) => B)(implicit cmp: math.Ordering[B]): K
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  29. def min(implicit ord: math.Ordering[K]): K
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  30. def minBy[B](f: (K) => B)(implicit cmp: math.Ordering[B]): K
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  31. def mkString: String
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  32. def mkString(sep: String): String
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  33. def mkString(start: String, sep: String, end: String): String
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  34. def nonEmpty: Boolean
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  35. def product(implicit num: math.Numeric[K]): K
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  36. def reduce(f: (K, K) => K): K
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  37. def reduceLeft(f: (K, K) => K): K
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  38. def reduceLeftOption(f: (K, K) => K): Option[K]
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  39. def reduceOption(f: (K, K) => K): Option[K]
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  40. def reduceRight(f: (K, K) => K): K
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  41. def reduceRightOption(f: (K, K) => K): Option[K]
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  42. final def repr: Set[K]
    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

  43. def sameElements[B >: A](that: IterableOnce[B]): Boolean
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  44. def seq: ImmutableKeySet.this.type
    Definition Classes
    Iterable
    Annotations
    @deprecated
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    (Since version 2.13.0) Iterable.seq always returns the iterable itself

  45. def size: Int
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    (Since version 2.13.0) Use .iterator.size instead

  46. def sum(implicit num: math.Numeric[K]): K
    Implicit
    This member is added by an implicit conversion from ImmutableKeySet toIterableOnceExtensionMethods[K] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
    Shadowing
    This implicitly inherited member is shadowed by one or more members in this class.
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    (immutableKeySet: IterableOnceExtensionMethods[K]).sum(num)
    Definition Classes
    IterableOnceExtensionMethods
    Annotations
    @deprecated
    Deprecated

    (Since version 2.13.0) Use .iterator.sum instead

  47. def to[C1](factory: Factory[K, C1]): C1
    Implicit
    This member is added by an implicit conversion from ImmutableKeySet toIterableOnceExtensionMethods[K] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
    Shadowing
    This implicitly inherited member is shadowed by one or more members in this class.
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    (immutableKeySet: IterableOnceExtensionMethods[K]).to(factory)
    Definition Classes
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    Annotations
    @deprecated
    Deprecated

    (Since version 2.13.0) Use .iterator.to(factory) instead

  48. def toArray[B >: A](implicit arg0: ClassTag[B]): Array[B]
    Implicit
    This member is added by an implicit conversion from ImmutableKeySet toIterableOnceExtensionMethods[K] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
    Shadowing
    This implicitly inherited member is shadowed by one or more members in this class.
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    (immutableKeySet: IterableOnceExtensionMethods[K]).toArray(arg0)
    Definition Classes
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    @deprecated
    Deprecated

    (Since version 2.13.0) Use .iterator.toArray

  49. def toBuffer[B >: A]: Buffer[B]
    Implicit
    This member is added by an implicit conversion from ImmutableKeySet toIterableOnceExtensionMethods[K] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
    Shadowing
    This implicitly inherited member is shadowed by one or more members in this class.
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    (immutableKeySet: IterableOnceExtensionMethods[K]).toBuffer
    Definition Classes
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    @deprecated
    Deprecated

    (Since version 2.13.0) Use .iterator.to(ArrayBuffer) instead

  50. def toIndexedSeq: collection.IndexedSeq[K]
    Implicit
    This member is added by an implicit conversion from ImmutableKeySet toIterableOnceExtensionMethods[K] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
    Shadowing
    This implicitly inherited member is shadowed by one or more members in this class.
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    (immutableKeySet: IterableOnceExtensionMethods[K]).toIndexedSeq
    Definition Classes
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    @deprecated
    Deprecated

    (Since version 2.13.0) Use .iterator.toIndexedSeq instead

  51. final def toIterable: collection.Iterable[K]
    Implicit
    This member is added by an implicit conversion from ImmutableKeySet toIterableOnceExtensionMethods[K] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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    This implicitly inherited member is shadowed by one or more members in this class.
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    (immutableKeySet: IterableOnceExtensionMethods[K]).toIterable
    Definition Classes
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    @deprecated @inline()
    Deprecated

    (Since version 2.13.0) Use .iterator.to(Iterable) instead

  52. final def toIterable: ImmutableKeySet.this.type

    returns

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

    Definition Classes
    IterableIterableOps
    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

  53. def toIterator: Iterator[K]
    Implicit
    This member is added by an implicit conversion from ImmutableKeySet toIterableOnceExtensionMethods[K] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
    Shadowing
    This implicitly inherited member is shadowed by one or more members in this class.
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    (immutableKeySet: IterableOnceExtensionMethods[K]).toIterator
    Definition Classes
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    Annotations
    @deprecated @inline()
    Deprecated

    (Since version 2.13.0) Use .iterator instead

  54. final def toIterator: Iterator[K]
    Definition Classes
    IterableOnceOps
    Annotations
    @deprecated @inline()
    Deprecated

    (Since version 2.13.0) Use .iterator instead of .toIterator

  55. def toList: List[K]
    Implicit
    This member is added by an implicit conversion from ImmutableKeySet toIterableOnceExtensionMethods[K] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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    This implicitly inherited member is shadowed by one or more members in this class.
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    (immutableKeySet: IterableOnceExtensionMethods[K]).toList
    Definition Classes
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    @deprecated
    Deprecated

    (Since version 2.13.0) Use .iterator.to(List) instead

  56. def toMap[K, V](implicit ev: <:<[K, (K, V)]): Map[K, V]
    Implicit
    This member is added by an implicit conversion from ImmutableKeySet toIterableOnceExtensionMethods[K] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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    This implicitly inherited member is shadowed by one or more members in this class.
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    (immutableKeySet: IterableOnceExtensionMethods[K]).toMap(ev)
    Definition Classes
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    @deprecated
    Deprecated

    (Since version 2.13.0) Use .iterator.to(Map) instead

  57. def toSeq: Seq[K]
    Implicit
    This member is added by an implicit conversion from ImmutableKeySet toIterableOnceExtensionMethods[K] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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    This implicitly inherited member is shadowed by one or more members in this class.
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    (immutableKeySet: IterableOnceExtensionMethods[K]).toSeq
    Definition Classes
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    @deprecated @inline()
    Deprecated

    (Since version 2.13.0) Use .iterator.to(Seq) instead

  58. def toSet[B >: A]: Set[B]
    Implicit
    This member is added by an implicit conversion from ImmutableKeySet toIterableOnceExtensionMethods[K] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
    Shadowing
    This implicitly inherited member is shadowed by one or more members in this class.
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    (immutableKeySet: IterableOnceExtensionMethods[K]).toSet
    Definition Classes
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    @deprecated @inline()
    Deprecated

    (Since version 2.13.0) Use .iterator.to(Set) instead

  59. def toStream: Stream[K]
    Implicit
    This member is added by an implicit conversion from ImmutableKeySet toIterableOnceExtensionMethods[K] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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    This implicitly inherited member is shadowed by one or more members in this class.
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    (immutableKeySet: IterableOnceExtensionMethods[K]).toStream
    Definition Classes
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    Annotations
    @deprecated @inline()
    Deprecated

    (Since version 2.13.0) Use .iterator.to(LazyList) instead

  60. final def toStream: Stream[K]
    Definition Classes
    IterableOnceOps
    Annotations
    @deprecated @inline()
    Deprecated

    (Since version 2.13.0) Use .to(LazyList) instead of .toStream

  61. final def toTraversable: collection.Traversable[K]
    Implicit
    This member is added by an implicit conversion from ImmutableKeySet toIterableOnceExtensionMethods[K] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
    Shadowing
    This implicitly inherited member is shadowed by one or more members in this class.
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    (immutableKeySet: IterableOnceExtensionMethods[K]).toTraversable
    Definition Classes
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    Annotations
    @deprecated @inline()
    Deprecated

    (Since version 2.13.0) Use .iterator.to(Iterable) instead

  62. final def toTraversable: collection.Traversable[K]

    Converts this immutable set to an unspecified Iterable.

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

    returns

    An Iterable containing all elements of this immutable 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

  63. def toVector: Vector[K]
    Implicit
    This member is added by an implicit conversion from ImmutableKeySet toIterableOnceExtensionMethods[K] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
    Shadowing
    This implicitly inherited member is shadowed by one or more members in this class.
    To access this member you can use a type ascription:
    (immutableKeySet: IterableOnceExtensionMethods[K]).toVector
    Definition Classes
    IterableOnceExtensionMethods
    Annotations
    @deprecated @inline()
    Deprecated

    (Since version 2.13.0) Use .iterator.to(Vector) instead

  64. def view(from: Int, until: Int): View[K]

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

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

    Definition Classes
    IterableOps
    Annotations
    @deprecated
    Deprecated

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

  65. def withFilter(f: (K) => Boolean): Iterator[K]
    Implicit
    This member is added by an implicit conversion from ImmutableKeySet toIterableOnceExtensionMethods[K] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
    Shadowing
    This implicitly inherited member is shadowed by one or more members in this class.
    To access this member you can use a type ascription:
    (immutableKeySet: IterableOnceExtensionMethods[K]).withFilter(f)
    Definition Classes
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    Annotations
    @deprecated
    Deprecated

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

  66. def [B](y: B): (ImmutableKeySet, B)
    Implicit
    This member is added by an implicit conversion from ImmutableKeySet toArrowAssoc[ImmutableKeySet] performed by method ArrowAssoc in scala.Predef.
    Definition Classes
    ArrowAssoc
    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 DefaultSerializable

Inherited from java.io.Serializable

Inherited from MapOps.GenKeySet

Inherited from AbstractSet[K]

Inherited from Set[K]

Inherited from SetOps[K, Set, Set[K]]

Inherited from Iterable[K]

Inherited from collection.AbstractSet[K]

Inherited from collection.Set[K]

Inherited from Equals

Inherited from collection.SetOps[K, [_]Set[_], Set[K]]

Inherited from (K) => Boolean

Inherited from AbstractIterable[K]

Inherited from collection.Iterable[K]

Inherited from IterableFactoryDefaults[K, [x]Set[x]]

Inherited from IterableOps[K, [_]Set[_], Set[K]]

Inherited from IterableOnceOps[K, [_]Set[_], Set[K]]

Inherited from IterableOnce[K]

Inherited from AnyRef

Inherited from Any

Inherited by implicit conversion iterableOnceExtensionMethods fromImmutableKeySet to IterableOnceExtensionMethods[K]

Inherited by implicit conversion any2stringadd fromImmutableKeySet to any2stringadd[ImmutableKeySet]

Inherited by implicit conversion StringFormat fromImmutableKeySet to StringFormat[ImmutableKeySet]

Inherited by implicit conversion Ensuring fromImmutableKeySet to Ensuring[ImmutableKeySet]

Inherited by implicit conversion ArrowAssoc fromImmutableKeySet to ArrowAssoc[ImmutableKeySet]

Ungrouped