Packages

final class HashSet[A] extends AbstractSet[A] with SetOps[A, HashSet, HashSet[A]] with StrictOptimizedIterableOps[A, HashSet, HashSet[A]] with IterableFactoryDefaults[A, HashSet] with Serializable

This class implements mutable sets using a hashtable.

Source
HashSet.scala
See also

"Scala's Collection Library overview" section on Hash Tables for more information.

Type Hierarchy
Ordering
  1. Alphabetic
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Inherited
  1. HashSet
  2. Serializable
  3. StrictOptimizedIterableOps
  4. AbstractSet
  5. Set
  6. SetOps
  7. Shrinkable
  8. Builder
  9. Growable
  10. Clearable
  11. Cloneable
  12. Cloneable
  13. Iterable
  14. AbstractSet
  15. Set
  16. Equals
  17. SetOps
  18. Function1
  19. AbstractIterable
  20. Iterable
  21. IterableFactoryDefaults
  22. IterableOps
  23. IterableOnceOps
  24. IterableOnce
  25. AnyRef
  26. 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 HashSet()
  2. new HashSet(initialCapacity: Int, loadFactor: Double)

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[A]): HashSet[A]

    Alias for intersect

    Alias for intersect

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

    Alias for diff

    Alias for diff

    Definition Classes
    SetOps
    Annotations
    @inline()
  5. final def ++(that: IterableOnce[A]): HashSet[A]

    Alias for concat

    Alias for concat

    Definition Classes
    SetOps
    Annotations
    @inline()
  6. final def ++[B >: A](suffix: IterableOnce[B]): HashSet[B]

    Alias for concat

    Alias for concat

    Definition Classes
    IterableOps
    Annotations
    @inline()
  7. final def ++=(xs: IterableOnce[A]): HashSet.this.type

    Alias for addAll

    Alias for addAll

    Definition Classes
    Growable
    Annotations
    @inline()
  8. final def +=(elem: A): HashSet.this.type

    Alias for addOne

    Alias for addOne

    Definition Classes
    Growable
    Annotations
    @inline()
  9. final def --=(xs: IterableOnce[A]): HashSet.this.type

    Alias for subtractAll

    Alias for subtractAll

    Definition Classes
    Shrinkable
    Annotations
    @inline()
  10. final def -=(elem: A): HashSet.this.type

    Alias for subtractOne

    Alias for subtractOne

    Definition Classes
    Shrinkable
    Annotations
    @inline()
  11. def ->[B](y: B): (HashSet[A], B)
    Implicit
    This member is added by an implicit conversion from HashSet[A] toArrowAssoc[HashSet[A]] performed by method ArrowAssoc in scala.Predef.
    Definition Classes
    ArrowAssoc
    Annotations
    @inline()
  12. 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
  13. def add(elem: A): Boolean
    Definition Classes
    HashSetSetOps
  14. def addAll(xs: IterableOnce[A]): HashSet.this.type

    Adds all elements produced by an IterableOnce to this mutable hash set.

    Adds all elements produced by an IterableOnce to this mutable hash set.

    xs

    the IterableOnce producing the elements to add.

    returns

    the mutable hash set itself.

    Definition Classes
    HashSetGrowable
  15. def addOne(elem: A): HashSet.this.type

    Adds a single element to this mutable hash set.

    Adds a single element to this mutable hash set.

    elem

    the element to add.

    returns

    the mutable hash set itself

    Definition Classes
    HashSetGrowable
    Annotations
    @inline()
  16. final def addString(b: StringBuilder): StringBuilder

    Appends all elements of this collection to a string builder.

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

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

    Appends all elements of this collection 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 collection, 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()
  18. def addString(b: StringBuilder, start: String, sep: String, end: String): StringBuilder

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

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

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

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

    A

    the result type of function g

    g

    a function R => A

    returns

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

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

    Tests if some element is contained in this set.

    Tests if some element is contained in this set.

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

    elem

    the element to test for membership.

    returns

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

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

    Cast the receiver object to be of type T0.

    Cast the receiver object to be of type T0.

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

    returns

    the receiver object.

    Definition Classes
    Any
    Exceptions thrown

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

  22. def canEqual(that: Any): Boolean

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

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

    that

    the value being probed for possible equality

    returns

    true if this instance can possibly equal that, otherwise false

    Definition Classes
    SetEquals
  23. 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 mutable hash set. By default the string prefix is the simple name of the collection class mutable hash set.

    Attributes
    protected[this]
    Definition Classes
    HashSetIterable
  24. def clear(): Unit

    Clears the contents of this builder.

    Clears the contents of this builder. After execution of this method the builder will contain no elements.

    Definition Classes
    HashSetBuilderClearable
  25. def clone(): HashSet[A]

    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.

    Definition Classes
    SetOpsCloneable → AnyRef
    Note

    not specified by SLS as a member of AnyRef

  26. final def coll: HashSet.this.type

    returns

    This collection as a C.

    Attributes
    protected
    Definition Classes
    IterableIterableOps
  27. def collect[B](pf: PartialFunction[A, B]): HashSet[B]

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

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

    B

    the element type of the returned iterable collection.

    pf

    the partial function which filters and maps the iterable collection.

    returns

    a new iterable collection 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
    StrictOptimizedIterableOpsIterableOpsIterableOnceOps
  28. def collectFirst[B](pf: PartialFunction[A, B]): Option[B]

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

    Finds the first element of the collection 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)

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

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

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

    A

    the type to which function g can be applied

    g

    a function A => T1

    returns

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

    Definition Classes
    Function1
    Annotations
    @unspecialized()
  30. def concat(that: IterableOnce[A]): HashSet[A]

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

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

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

    Example:

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

    the collection containing the elements to add.

    returns

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

    Definition Classes
    SetOps
  31. def concat[B >: A](suffix: IterableOnce[B]): HashSet[B]

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

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

    B

    the element type of the returned collection.

    suffix

    the traversable to append.

    returns

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

    Definition Classes
    IterableOps
  32. def contains(elem: A): Boolean
    Definition Classes
    HashSetSetOps
  33. def copyToArray[B >: A](xs: Array[B], start: Int, len: Int): Int

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

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

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

    Copying will stop once either all the elements of this collection 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. Note: will not terminate for infinite-sized collections.

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

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

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

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

    Copying will stop once either all the elements of this collection 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 Note: will not terminate for infinite-sized collections.

    Definition Classes
    IterableOnceOps
  35. def copyToArray[B >: A](xs: Array[B]): Int

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

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

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

    Copying will stop once either all the elements of this collection 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 Note: will not terminate for infinite-sized collections.

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

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

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

    Note: will not terminate for infinite-sized collections.

    B

    the type of the elements of that

    that

    the other collection

    p

    the test predicate, which relates elements from both collections

    returns

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

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

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

    Counts the number of elements in the collection 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
  38. def diff(that: collection.Set[A]): HashSet[A]

    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
  39. def drop(n: Int): HashSet[A]

    Selects all elements except first n ones.

    Selects all elements except first n ones.

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

    n

    the number of elements to drop from this iterable collection.

    returns

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

    Definition Classes
    IterableOpsIterableOnceOps
  40. def dropRight(n: Int): HashSet[A]

    The rest of the collection without its n last elements.

    The rest of the collection without its n last elements. For linear, immutable collections this should avoid making a copy.

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

    n

    the number of elements to drop from this iterable collection.

    returns

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

    Definition Classes
    StrictOptimizedIterableOpsIterableOps
  41. def dropWhile(p: (A) => Boolean): HashSet[A]

    Drops longest prefix of elements that satisfy a predicate.

    Drops longest prefix of elements that satisfy a predicate.

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

    p

    The predicate used to test elements.

    returns

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

    Definition Classes
    IterableOpsIterableOnceOps
  42. def empty: HashSet[A]

    The empty iterable of the same type as this iterable

    The empty iterable of the same type as this iterable

    returns

    an empty iterable of type C.

    Definition Classes
    IterableFactoryDefaultsIterableOps
  43. def ensuring(cond: (HashSet[A]) => Boolean, msg: => Any): HashSet[A]
    Implicit
    This member is added by an implicit conversion from HashSet[A] toEnsuring[HashSet[A]] performed by method Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  44. def ensuring(cond: (HashSet[A]) => Boolean): HashSet[A]
    Implicit
    This member is added by an implicit conversion from HashSet[A] toEnsuring[HashSet[A]] performed by method Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  45. def ensuring(cond: Boolean, msg: => Any): HashSet[A]
    Implicit
    This member is added by an implicit conversion from HashSet[A] toEnsuring[HashSet[A]] performed by method Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  46. def ensuring(cond: Boolean): HashSet[A]
    Implicit
    This member is added by an implicit conversion from HashSet[A] toEnsuring[HashSet[A]] performed by method Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  47. 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
  48. def equals(that: Any): Boolean

    The universal equality method defined in AnyRef.

    The universal equality method defined in AnyRef.

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

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

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

    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 collection, otherwise false

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

    Selects all elements of this iterable collection which satisfy a predicate.

    Selects all elements of this iterable collection which satisfy a predicate.

    returns

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

    Definition Classes
    StrictOptimizedIterableOpsIterableOpsIterableOnceOps
  51. def filterImpl(pred: (A) => Boolean, isFlipped: Boolean): HashSet[A]
    Attributes
    protected[collection]
    Definition Classes
    StrictOptimizedIterableOps
  52. def filterInPlace(p: (A) => Boolean): HashSet.this.type

    Removes all elements from the set for which do not satisfy a predicate.

    Removes all elements from the set for which do not satisfy a predicate.

    p

    the predicate used to test elements. Only elements for which p returns true are retained in the set; all others are removed.

    Definition Classes
    HashSetSetOps
  53. def filterNot(pred: (A) => Boolean): HashSet[A]

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

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

    pred

    the predicate used to test elements.

    returns

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

    Definition Classes
    StrictOptimizedIterableOpsIterableOpsIterableOnceOps
  54. 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

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

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

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

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

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

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

    Definition Classes
    StrictOptimizedIterableOpsIterableOpsIterableOnceOps
  57. def flatten[B](implicit toIterableOnce: (A) => IterableOnce[B]): HashSet[B]

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

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

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

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

    the type of the elements of each traversable collection.

    returns

    a new iterable collection resulting from concatenating all element iterable collections.

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

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

    Folds the elements of this collection using the specified associative binary operator. The default implementation in IterableOnce is equivalent to foldLeft but may be overridden for more efficient traversal orders.

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

    Note: will not terminate for infinite-sized collections.

    A1

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

    z

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

    op

    a binary operator that must be associative.

    returns

    the result of applying the fold operator op between all the elements and z, or z if this collection is empty.

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

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

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

    Note: will not terminate for infinite-sized collections.

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

    B

    the result type of the binary operator.

    z

    the start value.

    op

    the binary operator.

    returns

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

    op(...op(z, x_1), x_2, ..., x_n)

    where x1, ..., xn are the elements of this collection. Returns z if this collection is empty.

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

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

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

    Note: will not terminate for infinite-sized collections.

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

    B

    the result type of the binary operator.

    z

    the start value.

    op

    the binary operator.

    returns

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

    op(x_1, op(x_2, ... op(x_n, z)...))

    where x1, ..., xn are the elements of this collection. Returns z if this collection is empty.

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

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

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

    Note: may not terminate for infinite-sized collections.

    p

    the predicate used to test elements.

    returns

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

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

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

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

    Definition Classes
    HashSetIterableOnceOps
  63. 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 HashSet[A] toStringFormat[HashSet[A]] performed by method StringFormat in scala.Predef.
    Definition Classes
    StringFormat
    Annotations
    @inline()
  64. def fromSpecific(coll: IterableOnce[A]): HashSet[A]

    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.

  65. 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()
  66. def groupBy[K](f: (A) => K): immutable.Map[K, HashSet[A]]

    Partitions this iterable collection into a map of iterable collections according to some discriminator function.

    Partitions this iterable collection into a map of iterable collections 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 iterable collections 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 iterable collection of those elements x for which f(x) equals k.

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

    Partitions this iterable collection into a map of iterable collections according to a discriminator function key.

    Partitions this iterable collection into a map of iterable collections 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
  68. def groupMapReduce[K, B](key: (A) => K)(f: (A) => B)(reduce: (B, B) => B): immutable.Map[K, B]

    Partitions this iterable collection into a map according to a discriminator function key.

    Partitions this iterable collection into a map according to a discriminator function key. All the values that have the same discriminator are then transformed by the value 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
  69. def grouped(size: Int): Iterator[HashSet[A]]

    Partitions elements in fixed size iterable collections.

    Partitions elements in fixed size iterable collections.

    size

    the number of elements per group

    returns

    An iterator producing iterable collections 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

  70. 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
    HashSetSet → AnyRef → Any
  71. def head: A

    Selects the first element of this iterable collection.

    Selects the first element of this iterable collection.

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

    returns

    the first element of this iterable collection.

    Definition Classes
    IterableOps
    Exceptions thrown

    NoSuchElementException if the iterable collection is empty.

  72. def headOption: Option[A]

    Optionally selects the first element.

    Optionally selects the first element.

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

    returns

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

    Definition Classes
    IterableOps
  73. def init: HashSet[A]

    The initial part of the collection without its last element.

    The initial part of the collection without its last element.

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

    Definition Classes
    IterableOps
  74. def inits: Iterator[HashSet[A]]

    Iterates over the inits of this iterable collection.

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

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

  75. def intersect(that: collection.Set[A]): HashSet[A]

    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
  76. def isEmpty: Boolean

    Tests whether the mutable hash set is empty.

    Tests whether the mutable hash set is empty.

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

    returns

    true if the mutable hash set contains no elements, false otherwise.

    Definition Classes
    HashSetIterableOnceOps
  77. final def isInstanceOf[T0]: Boolean

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

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

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

    returns

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

    Definition Classes
    Any
  78. def isTraversableAgain: Boolean

    Tests whether this iterable collection can be repeatedly traversed.

    Tests whether this iterable collection 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
  79. def iterableFactory: IterableFactory[HashSet]

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

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

    Definition Classes
    HashSetSetIterableSetIterableIterableOps
    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).

  80. def iterator: Iterator[A]

    Iterator can be used only once

    Iterator can be used only once

    Definition Classes
    HashSetIterableOnce
  81. def knownSize: Int

    returns

    The number of elements in the collection under construction, if it can be cheaply computed, -1 otherwise. The default implementation always returns -1.

    Definition Classes
    HashSetSetOpsGrowableIterableOnce
  82. def last: A

    Selects the last element.

    Selects the last element.

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

    returns

    The last element of this iterable collection.

    Definition Classes
    IterableOps
    Exceptions thrown

    NoSuchElementException If the iterable collection is empty.

  83. def lastOption: Option[A]

    Optionally selects the last element.

    Optionally selects the last element.

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

    returns

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

    Definition Classes
    IterableOps
  84. def lazyZip[B](that: collection.Iterable[B]): LazyZip2[A, B, HashSet.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
  85. def map[B](f: (A) => B): HashSet[B]

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

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

    B

    the element type of the returned iterable collection.

    f

    the function to apply to each element.

    returns

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

    Definition Classes
    StrictOptimizedIterableOpsIterableOpsIterableOnceOps
  86. def mapResult[NewTo](f: (HashSet[A]) => NewTo): Builder[A, NewTo]

    A builder resulting from this builder my mapping the result using f.

    A builder resulting from this builder my mapping the result using f.

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

    Finds the largest element.

    Finds the largest element.

    Note: will not terminate for infinite-sized collections.

    B

    The type over which the ordering is defined.

    ord

    An ordering to be used for comparing elements.

    returns

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

    Definition Classes
    IterableOnceOps
    Exceptions thrown

    UnsupportedOperationException if this collection is empty.

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

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

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

    Note: will not terminate for infinite-sized collections.

    B

    The result type of the function f.

    f

    The measuring function.

    cmp

    An ordering to be used for comparing elements.

    returns

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

    Definition Classes
    IterableOnceOps
    Exceptions thrown

    UnsupportedOperationException if this collection is empty.

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

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

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

    Note: will not terminate for infinite-sized collections.

    B

    The result type of the function f.

    f

    The measuring function.

    cmp

    An ordering to be used for comparing elements.

    returns

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

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

    Finds the largest element.

    Finds the largest element.

    Note: will not terminate for infinite-sized collections.

    B

    The type over which the ordering is defined.

    ord

    An ordering to be used for comparing elements.

    returns

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

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

    Finds the smallest element.

    Finds the smallest element.

    Note: will not terminate for infinite-sized collections.

    B

    The type over which the ordering is defined.

    ord

    An ordering to be used for comparing elements.

    returns

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

    Definition Classes
    IterableOnceOps
    Exceptions thrown

    UnsupportedOperationException if this collection is empty.

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

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

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

    Note: will not terminate for infinite-sized collections.

    B

    The result type of the function f.

    f

    The measuring function.

    cmp

    An ordering to be used for comparing elements.

    returns

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

    Definition Classes
    IterableOnceOps
    Exceptions thrown

    UnsupportedOperationException if this collection is empty.

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

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

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

    Note: will not terminate for infinite-sized collections.

    B

    The result type of the function f.

    f

    The measuring function.

    cmp

    An ordering to be used for comparing elements.

    returns

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

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

    Finds the smallest element.

    Finds the smallest element.

    Note: will not terminate for infinite-sized collections.

    B

    The type over which the ordering is defined.

    ord

    An ordering to be used for comparing elements.

    returns

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

    Definition Classes
    IterableOnceOps
  95. final def mkString: String

    Displays all elements of this collection in a string.

    Displays all elements of this collection in a string.

    Delegates to addString, which can be overridden.

    returns

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

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

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

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

    Delegates to addString, which can be overridden.

    sep

    the separator string.

    returns

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

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

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

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

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

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

  98. 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
  99. def newSpecificBuilder: Builder[A, HashSet[A]]

    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.

  100. def nonEmpty: Boolean

    Tests whether the collection is not empty.

    Tests whether the collection is not empty.

    returns

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

    Definition Classes
    IterableOnceOps
    Annotations
    @deprecatedOverriding(message = "nonEmpty is defined as !isEmpty; override isEmpty instead", since = "2.13.0")
  101. 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

  102. 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

  103. def partition(p: (A) => Boolean): (HashSet[A], HashSet[A])

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

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

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

    Definition Classes
    StrictOptimizedIterableOpsIterableOps
  104. def partitionMap[A1, A2](f: (A) => Either[A1, A2]): (HashSet[A1], HashSet[A2])

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

    returns

    a pair of iterable collections: 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
    StrictOptimizedIterableOpsIterableOps
  105. def product[B >: A](implicit num: math.Numeric[B]): B

    Multiplies up the elements of this collection.

    Multiplies up the elements of this collection.

    Note: will not terminate for infinite-sized collections.

    B

    the result type of the * operator.

    num

    an implicit parameter defining a set of numeric operations which includes the * operator to be used in forming the product.

    returns

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

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

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

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

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

    B

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

    op

    A binary operator that must be associative.

    returns

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

    Definition Classes
    IterableOnceOps
    Exceptions thrown

    UnsupportedOperationException if this collection is empty.

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

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

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

    Note: will not terminate for infinite-sized collections.

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

    B

    the result type of the binary operator.

    op

    the binary operator.

    returns

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

    op( op( ... op(x_1, x_2) ..., x_{n-1}), x_n)

    where x1, ..., xn are the elements of this collection.

    Definition Classes
    IterableOnceOps
    Exceptions thrown

    UnsupportedOperationException if this collection is empty.

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

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

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

    Note: will not terminate for infinite-sized collections.

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

    B

    the result type of the binary operator.

    op

    the binary operator.

    returns

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

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

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

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

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

    B

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

    op

    A binary operator that must be associative.

    returns

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

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

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

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

    Note: will not terminate for infinite-sized collections.

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

    B

    the result type of the binary operator.

    op

    the binary operator.

    returns

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

    op(x_1, op(x_2, ..., op(x_{n-1}, x_n)...))

    where x1, ..., xn are the elements of this collection.

    Definition Classes
    IterableOnceOps
    Exceptions thrown

    UnsupportedOperationException if this collection is empty.

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

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

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

    Note: will not terminate for infinite-sized collections.

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

    B

    the result type of the binary operator.

    op

    the binary operator.

    returns

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

    Definition Classes
    IterableOnceOps
  112. def remove(elem: A): Boolean

    Removes an element from this set.

    Removes an element from this set.

    elem

    the element to be removed

    returns

    true if this set contained the element before it was removed

    Definition Classes
    HashSetSetOps
  113. def result(): HashSet[A]

    Result collection consisting of all elements appended so far.

    Result collection consisting of all elements appended so far.

    Definition Classes
    SetOpsBuilder
  114. def reversed: collection.Iterable[A]
    Attributes
    protected
    Definition Classes
    IterableOnceOps
  115. def scan[B >: A](z: B)(op: (B, B) => B): HashSet[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 iterable collection containing the prefix scan of the elements in this iterable collection

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

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

    Produces a iterable collection 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
    StrictOptimizedIterableOpsIterableOpsIterableOnceOps
  117. def scanRight[B](z: B)(op: (A, B) => B): HashSet[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
  118. def size: Int

    The size of this mutable hash set.

    The size of this mutable hash set.

    returns

    the number of elements in this mutable hash set.

    Definition Classes
    HashSetIterableOnceOps
  119. def sizeCompare(that: collection.Iterable[_]): Int

    Compares the size of this iterable collection to the size of another Iterable.

    Compares the size of this iterable collection to the size of another Iterable.

    that

    the Iterable whose size is compared with this iterable collection'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
  120. def sizeCompare(otherSize: Int): Int

    Compares the size of this iterable collection to a test value.

    Compares the size of this iterable collection 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

  121. def sizeHint(size: Int): Unit

    Gives a hint how many elements are expected to be added when the next result is called.

    Gives a hint how many elements are expected to be added when the next result is called. Some builder classes will optimize their representation based on the hint. However, builder implementations are still required to work correctly even if the hint is wrong, i.e. a different number of elements is added.

    size

    the hint how many elements will be added.

    Definition Classes
    HashSetBuilder
  122. final def sizeHint(coll: IterableOnce[_], delta: Int = 0): Unit

    Gives a hint that one expects the result of this builder to have the same size as the given collection, plus some delta.

    Gives a hint that one expects the result of this builder to have the same size as the given collection, plus some delta. This will provide a hint only if the collection has a known size Some builder classes will optimize their representation based on the hint. However, builder implementations are still required to work correctly even if the hint is wrong, i.e. a different number of elements is added.

    coll

    the collection which serves as a hint for the result's size.

    delta

    a correction to add to the coll.size to produce the size hint.

    Definition Classes
    Builder
  123. final def sizeHintBounded(size: Int, boundingColl: collection.Iterable[_]): Unit

    Gives a hint how many elements are expected to be added when the next result is called, together with an upper bound given by the size of some other collection.

    Gives a hint how many elements are expected to be added when the next result is called, together with an upper bound given by the size of some other collection. Some builder classes will optimize their representation based on the hint. However, builder implementations are still required to work correctly even if the hint is wrong, i.e. a different number of elements is added.

    size

    the hint how many elements will be added.

    boundingColl

    the bounding collection. If it is an IndexedSeqLike, then sizes larger than collection's size are reduced.

    Definition Classes
    Builder
  124. final def sizeIs: SizeCompareOps

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

    Returns a value class containing operations for comparing the size of this iterable collection 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()
  125. def slice(from: Int, until: Int): HashSet[A]

    Selects an interval of elements.

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

    from <= indexOf(x) < until

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

    from

    the lowest index to include from this iterable collection.

    until

    the lowest index to EXCLUDE from this iterable collection.

    returns

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

    Definition Classes
    IterableOpsIterableOnceOps
  126. def sliding(size: Int, step: Int): Iterator[HashSet[A]]

    Groups elements in fixed size blocks by passing a "sliding window" over them (as opposed to partitioning them, as is done in grouped.)

    Groups elements in fixed size blocks by passing a "sliding window" over them (as opposed to partitioning them, as is done in grouped.)

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

    size

    the number of elements per group

    step

    the distance between the first elements of successive groups

    returns

    An iterator producing iterable collections 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

  127. def sliding(size: Int): Iterator[HashSet[A]]

    Groups elements in fixed size blocks by passing a "sliding window" over them (as opposed to partitioning them, as is done in grouped.)

    Groups elements in fixed size blocks by passing a "sliding window" over them (as opposed to partitioning them, as is done in grouped.)

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

    size

    the number of elements per group

    returns

    An iterator producing iterable collections 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

  128. def span(p: (A) => Boolean): (HashSet[A], HashSet[A])

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

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

    Definition Classes
    StrictOptimizedIterableOpsIterableOpsIterableOnceOps
  129. def splitAt(n: Int): (HashSet[A], HashSet[A])

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

    Splits this iterable collection 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 iterable collections consisting of the first n elements of this iterable collection, and the other elements.

    Definition Classes
    IterableOpsIterableOnceOps
  130. def stepper[S <: Stepper[_]](implicit shape: StepperShape[A, S]): S with EfficientSplit

    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
    HashSetIterableOnce
  131. final def strictOptimizedCollect[B, C2](b: Builder[B, C2], pf: PartialFunction[A, B]): C2

    B

    Type of elements of the resulting collection (e.g. String)

    C2

    Type of the resulting collection (e.g. List[String])

    b

    Builder to use to build the resulting collection

    pf

    Element transformation partial function

    returns

    The resulting collection

    Attributes
    protected[this]
    Definition Classes
    StrictOptimizedIterableOps
    Annotations
    @inline()
  132. final def strictOptimizedConcat[B >: A, C2](that: IterableOnce[B], b: Builder[B, C2]): C2

    B

    Type of elements of the resulting collections (e.g. Int)

    C2

    Type of the resulting collection (e.g. List[Int])

    that

    Elements to concatenate to this collection

    b

    Builder to use to build the resulting collection

    returns

    The resulting collection

    Attributes
    protected[this]
    Definition Classes
    StrictOptimizedIterableOps
    Annotations
    @inline()
  133. final def strictOptimizedFlatMap[B, C2](b: Builder[B, C2], f: (A) => IterableOnce[B]): C2

    B

    Type of elements of the resulting collection (e.g. String)

    C2

    Type of the resulting collection (e.g. List[String])

    b

    Builder to use to build the resulting collection

    f

    Element transformation function

    returns

    The resulting collection

    Attributes
    protected[this]
    Definition Classes
    StrictOptimizedIterableOps
    Annotations
    @inline()
  134. final def strictOptimizedFlatten[B, C2](b: Builder[B, C2])(implicit toIterableOnce: (A) => IterableOnce[B]): C2

    B

    Type of elements of the resulting collection (e.g. Int)

    C2

    Type of the resulting collection (e.g. List[Int])

    b

    Builder to use to build the resulting collection

    toIterableOnce

    Evidence that A can be seen as an IterableOnce[B]

    returns

    The resulting collection

    Attributes
    protected[this]
    Definition Classes
    StrictOptimizedIterableOps
    Annotations
    @inline()
  135. final def strictOptimizedMap[B, C2](b: Builder[B, C2], f: (A) => B): C2

    B

    Type of elements of the resulting collection (e.g. String)

    C2

    Type of the resulting collection (e.g. List[String])

    b

    Builder to use to build the resulting collection

    f

    Element transformation function

    returns

    The resulting collection

    Attributes
    protected[this]
    Definition Classes
    StrictOptimizedIterableOps
    Annotations
    @inline()
  136. final def strictOptimizedZip[B, C2](that: IterableOnce[B], b: Builder[(A, B), C2]): C2

    B

    Type of elements of the second collection (e.g. String)

    C2

    Type of the resulting collection (e.g. List[(Int, String)])

    that

    Collection to zip with this collection

    b

    Builder to use to build the resulting collection

    returns

    The resulting collection

    Attributes
    protected[this]
    Definition Classes
    StrictOptimizedIterableOps
    Annotations
    @inline()
  137. def stringPrefix: String
    Attributes
    protected[this]
    Definition Classes
    SetIterable
  138. def subsetOf(that: collection.Set[A]): Boolean

    Tests whether this set is a subset of another set.

    Tests whether this set is a subset of another set.

    that

    the set to test.

    returns

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

    Definition Classes
    SetOps
  139. def subsets(): Iterator[HashSet[A]]

    An iterator over all subsets of this set.

    An iterator over all subsets of this set.

    returns

    the iterator.

    Definition Classes
    SetOps
  140. def subsets(len: Int): Iterator[HashSet[A]]

    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
  141. def subtractAll(xs: IterableOnce[A]): HashSet.this.type

    Removes all elements produced by an iterator from this mutable hash set.

    Removes all elements produced by an iterator from this mutable hash set.

    xs

    the iterator producing the elements to remove.

    returns

    the mutable hash set itself

    Definition Classes
    HashSetShrinkable
  142. def subtractOne(elem: A): HashSet.this.type

    Removes a single element from this mutable hash set.

    Removes a single element from this mutable hash set.

    elem

    the element to remove.

    returns

    the mutable hash set itself

    Definition Classes
    HashSetShrinkable
    Annotations
    @inline()
  143. def sum[B >: A](implicit num: math.Numeric[B]): B

    Sums up the elements of this collection.

    Sums up the elements of this collection.

    Note: will not terminate for infinite-sized collections.

    B

    the result type of the + operator.

    num

    an implicit parameter defining a set of numeric operations which includes the + operator to be used in forming the sum.

    returns

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

    Definition Classes
    IterableOnceOps
  144. 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
  145. def tail: HashSet[A]

    The rest of the collection without its first element.

    The rest of the collection without its first element.

    Definition Classes
    IterableOps
  146. def tails: Iterator[HashSet[A]]

    Iterates over the tails of this iterable collection.

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

    returns

    an iterator over all the tails of this iterable collection

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

  147. def take(n: Int): HashSet[A]

    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 iterable collection.

    returns

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

    Definition Classes
    IterableOpsIterableOnceOps
  148. def takeRight(n: Int): HashSet[A]

    A collection containing the last n elements of this collection.

    A collection containing the last n elements of this collection.

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

    n

    the number of elements to take from this iterable collection.

    returns

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

    Definition Classes
    StrictOptimizedIterableOpsIterableOps
  149. def takeWhile(p: (A) => Boolean): HashSet[A]

    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 iterable collection whose elements all satisfy the predicate p.

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

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

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

    U

    the return type of f

    f

    a function to apply to each element in this iterable collection

    returns

    The same logical collection as this

    Definition Classes
    StrictOptimizedIterableOpsIterableOpsIterableOnceOps
  151. def to[C1](factory: Factory[A, C1]): C1

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

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

    xs.to(List) xs.to(ArrayBuffer) xs.to(BitSet) // for xs: Iterable[Int]

    Definition Classes
    IterableOnceOps
  152. def toArray[B >: A](implicit arg0: ClassTag[B]): Array[B]

    Convert collection to array.

    Convert collection to array.

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

    Definition Classes
    IterableOnceOps
  153. final def toBuffer[B >: A]: Buffer[B]
    Definition Classes
    IterableOnceOps
    Annotations
    @inline()
  154. def toIndexedSeq: immutable.IndexedSeq[A]
    Definition Classes
    IterableOnceOps
  155. final def toIterable: HashSet.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
  156. def toList: immutable.List[A]
    Definition Classes
    IterableOnceOps
  157. def toMap[K, V](implicit ev: <:<[A, (K, V)]): immutable.Map[K, V]
    Definition Classes
    IterableOnceOps
  158. def toSeq: immutable.Seq[A]

    returns

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

    Definition Classes
    IterableOnceOps
  159. def toSet[B >: A]: immutable.Set[B]
    Definition Classes
    IterableOnceOps
  160. 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
  161. def toVector: immutable.Vector[A]
    Definition Classes
    IterableOnceOps
  162. def transpose[B](implicit asIterable: (A) => collection.Iterable[B]): HashSet[HashSet[B]]

    Transposes this iterable collection of iterable collections into a iterable collection of iterable collections.

    Transposes this iterable collection of iterable collections into a iterable collection of iterable collections.

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

    returns

    a two-dimensional iterable collection of iterable collections which has as nth row the nth column of this iterable collection.

    Definition Classes
    IterableOps
    Exceptions thrown

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

  163. final def union(that: collection.Set[A]): HashSet[A]

    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()
  164. def unzip[A1, A2](implicit asPair: (A) => (A1, A2)): (HashSet[A1], HashSet[A2])

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

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

    val xs = Iterable(
               (1, "one"),
               (2, "two"),
               (3, "three")).unzip
    // xs == (Iterable(1, 2, 3),
    //        Iterable(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 iterable collection is a pair.

    returns

    a pair of iterable collections, containing the first, respectively second half of each element pair of this iterable collection.

    Definition Classes
    StrictOptimizedIterableOpsIterableOps
  165. def unzip3[A1, A2, A3](implicit asTriple: (A) => (A1, A2, A3)): (HashSet[A1], HashSet[A2], HashSet[A3])

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

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

    val xs = Iterable(
               (1, "one", '1'),
               (2, "two", '2'),
               (3, "three", '3')).unzip3
    // xs == (Iterable(1, 2, 3),
    //        Iterable(one, two, three),
    //        Iterable(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 iterable collection is a triple.

    returns

    a triple of iterable collections, containing the first, second, respectively third member of each element triple of this iterable collection.

    Definition Classes
    StrictOptimizedIterableOpsIterableOps
  166. def update(elem: A, included: Boolean): Unit

    Updates the presence of a single element in this set.

    Updates the presence of a single element in this set.

    This method allows one to add or remove an element elem from this set depending on the value of parameter included. Typically, one would use the following syntax:

    set(elem) = true  // adds element
    set(elem) = false // removes element
    elem

    the element to be added or removed

    included

    a flag indicating whether element should be included or excluded.

    Definition Classes
    SetOps
  167. def view: View[A]

    A view over the elements of this collection.

    A view over the elements of this collection.

    Definition Classes
    IterableOps
  168. 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

  169. 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

  170. 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

  171. def withFilter(p: (A) => Boolean): WithFilter[A, [_]HashSet[_]]

    Creates a non-strict filter of this iterable collection.

    Creates a non-strict filter of this iterable collection.

    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 iterable collection which satisfy the predicate p.

    Definition Classes
    IterableOps
  172. def writeReplace(): AnyRef
    Attributes
    protected[this]
  173. def zip[B](that: IterableOnce[B]): HashSet[(A, B)]

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

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

    Definition Classes
    StrictOptimizedIterableOpsIterableOps
  174. def zipAll[A1 >: A, B](that: collection.Iterable[B], thisElem: A1, thatElem: B): HashSet[(A1, B)]

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

    Returns a iterable collection formed from this iterable collection 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 iterable collection is shorter than that.

    thatElem

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

    returns

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

    Definition Classes
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  175. def zipWithIndex: HashSet[(A, Int)]

    Zips this iterable collection with its indices.

    Zips this iterable collection with its indices.

    returns

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

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

  176. final def |(that: collection.Set[A]): HashSet[A]

    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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  1. def +(elem1: A, elem2: A, elems: A*): HashSet[A]
    Definition Classes
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  2. def +(elem: A): HashSet[A]
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  3. def ++:[B >: A](that: IterableOnce[B]): HashSet[B]
    Definition Classes
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    (Since version 2.13.0) Use ++ instead of ++: for collections of type Iterable

  4. final def +=(elem1: A, elem2: A, elems: A*): HashSet.this.type

    Adds two or more elements to this growable collection.

    Adds two or more elements to this growable collection.

    elem1

    the first element to add.

    elem2

    the second element to add.

    elems

    the remaining elements to add.

    returns

    the growable collection itself

    Definition Classes
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  5. def -(elem1: A, elem2: A, elems: A*): HashSet[A]
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  6. def -(elem: A): HashSet[A]
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  7. def --(that: IterableOnce[A]): HashSet[A]
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  8. def -=(elem1: A, elem2: A, elems: A*): HashSet.this.type

    Removes two or more elements from this shrinkable collection.

    Removes two or more elements from this shrinkable collection.

    elem1

    the first element to remove.

    elem2

    the second element to remove.

    elems

    the remaining elements to remove.

    returns

    the shrinkable collection itself

    Definition Classes
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  9. def /:[B](z: B)(op: (B, A) => B): B
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  10. final def /:[B](z: B)(op: (B, A) => B): B
    Definition Classes
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  11. def :\[B](z: B)(op: (A, B) => B): B
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  12. final def :\[B](z: B)(op: (A, B) => B): B
    Definition Classes
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    (Since version 2.13.0) Use foldRight instead of :\

  13. def aggregate[B](z: => B)(seqop: (B, A) => B, combop: (B, B) => B): B
    Definition Classes
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    Annotations
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    (Since version 2.13.0) aggregate is not relevant for sequential collections. Use foldLeft(z)(seqop) instead.

  14. def collectFirst[B](f: PartialFunction[A, B]): Option[B]
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  15. def companion: IterableFactory[[_]HashSet[_]]
    Definition Classes
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  16. def copyToBuffer(dest: Buffer[A]): Unit
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  17. final def copyToBuffer[B >: A](dest: Buffer[B]): Unit
    Definition Classes
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    (Since version 2.13.0) Use dest ++= coll instead

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

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

    Tests whether this collection 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

  29. def isEmpty: Boolean
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  30. def map[B](f: (A) => B): IterableOnce[B]
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  31. def max(implicit ord: math.Ordering[A]): A
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  32. def maxBy[B](f: (A) => B)(implicit cmp: math.Ordering[B]): A
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  33. def min(implicit ord: math.Ordering[A]): A
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  34. def minBy[B](f: (A) => B)(implicit cmp: math.Ordering[B]): A
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  35. def mkString: String
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  36. def mkString(sep: String): String
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  37. def mkString(start: String, sep: String, end: String): String
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  38. def nonEmpty: Boolean
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  39. def product(implicit num: math.Numeric[A]): A
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  40. def reduce(f: (A, A) => A): A
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  41. def reduceLeft(f: (A, A) => A): A
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  42. def reduceLeftOption(f: (A, A) => A): Option[A]
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  43. def reduceOption(f: (A, A) => A): Option[A]
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  44. def reduceRight(f: (A, A) => A): A
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  45. def reduceRightOption(f: (A, A) => A): Option[A]
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  46. final def repr: HashSet[A]
    Definition Classes
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    (Since version 2.13.0) Use coll instead of repr in a collection implementation, use the collection value itself from the outside

  47. final def retain(p: (A) => Boolean): Unit
    Definition Classes
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    Deprecated

    (Since version 2.13.0) Use filterInPlace instead

  48. def sameElements[B >: A](that: IterableOnce[B]): Boolean
    Implicit
    This member is added by an implicit conversion from HashSet[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
    Definition Classes
    IterableOnceExtensionMethods
    Annotations
    @deprecated
    Deprecated

    (Since version 2.13.0) Use .iterator.sameElements instead

  49. def seq: HashSet.this.type
    Definition Classes
    Iterable
    Annotations
    @deprecated
    Deprecated

    (Since version 2.13.0) Iterable.seq always returns the iterable itself

  50. def size: Int
    Implicit
    This member is added by an implicit conversion from HashSet[A] toIterableOnceExtensionMethods[A] 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:
    (hashSet: IterableOnceExtensionMethods[A]).size
    Definition Classes
    IterableOnceExtensionMethods
    Annotations
    @deprecated
    Deprecated

    (Since version 2.13.0) Use .iterator.size instead

  51. def sum(implicit num: math.Numeric[A]): A
    Implicit
    This member is added by an implicit conversion from HashSet[A] toIterableOnceExtensionMethods[A] 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:
    (hashSet: IterableOnceExtensionMethods[A]).sum(num)
    Definition Classes
    IterableOnceExtensionMethods
    Annotations
    @deprecated
    Deprecated

    (Since version 2.13.0) Use .iterator.sum instead

  52. def to[C1](factory: Factory[A, C1]): C1
    Implicit
    This member is added by an implicit conversion from HashSet[A] toIterableOnceExtensionMethods[A] 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:
    (hashSet: IterableOnceExtensionMethods[A]).to(factory)
    Definition Classes
    IterableOnceExtensionMethods
    Annotations
    @deprecated
    Deprecated

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

  53. def toArray[B >: A](implicit arg0: ClassTag[B]): Array[B]
    Implicit
    This member is added by an implicit conversion from HashSet[A] toIterableOnceExtensionMethods[A] 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:
    (hashSet: IterableOnceExtensionMethods[A]).toArray(arg0)
    Definition Classes
    IterableOnceExtensionMethods
    Annotations
    @deprecated
    Deprecated

    (Since version 2.13.0) Use .iterator.toArray

  54. def toBuffer[B >: A]: Buffer[B]
    Implicit
    This member is added by an implicit conversion from HashSet[A] toIterableOnceExtensionMethods[A] 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:
    (hashSet: IterableOnceExtensionMethods[A]).toBuffer
    Definition Classes
    IterableOnceExtensionMethods
    Annotations
    @deprecated
    Deprecated

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

  55. def toIndexedSeq: collection.IndexedSeq[A]
    Implicit
    This member is added by an implicit conversion from HashSet[A] toIterableOnceExtensionMethods[A] 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:
    (hashSet: IterableOnceExtensionMethods[A]).toIndexedSeq
    Definition Classes
    IterableOnceExtensionMethods
    Annotations
    @deprecated
    Deprecated

    (Since version 2.13.0) Use .iterator.toIndexedSeq instead

  56. final def toIterable: collection.Iterable[A]
    Implicit
    This member is added by an implicit conversion from HashSet[A] toIterableOnceExtensionMethods[A] 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:
    (hashSet: IterableOnceExtensionMethods[A]).toIterable
    Definition Classes
    IterableOnceExtensionMethods
    Annotations
    @deprecated @inline()
    Deprecated

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

  57. def toIterator: Iterator[A]
    Implicit
    This member is added by an implicit conversion from HashSet[A] toIterableOnceExtensionMethods[A] 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:
    (hashSet: IterableOnceExtensionMethods[A]).toIterator
    Definition Classes
    IterableOnceExtensionMethods
    Annotations
    @deprecated @inline()
    Deprecated

    (Since version 2.13.0) Use .iterator instead

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

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

  59. def toList: immutable.List[A]
    Implicit
    This member is added by an implicit conversion from HashSet[A] toIterableOnceExtensionMethods[A] 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:
    (hashSet: IterableOnceExtensionMethods[A]).toList
    Definition Classes
    IterableOnceExtensionMethods
    Annotations
    @deprecated
    Deprecated

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

  60. def toMap[K, V](implicit ev: <:<[A, (K, V)]): immutable.Map[K, V]
    Implicit
    This member is added by an implicit conversion from HashSet[A] toIterableOnceExtensionMethods[A] 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:
    (hashSet: IterableOnceExtensionMethods[A]).toMap(ev)
    Definition Classes
    IterableOnceExtensionMethods
    Annotations
    @deprecated
    Deprecated

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

  61. def toSeq: immutable.Seq[A]
    Implicit
    This member is added by an implicit conversion from HashSet[A] toIterableOnceExtensionMethods[A] 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:
    (hashSet: IterableOnceExtensionMethods[A]).toSeq
    Definition Classes
    IterableOnceExtensionMethods
    Annotations
    @deprecated @inline()
    Deprecated

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

  62. def toSet[B >: A]: immutable.Set[B]
    Implicit
    This member is added by an implicit conversion from HashSet[A] toIterableOnceExtensionMethods[A] 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:
    (hashSet: IterableOnceExtensionMethods[A]).toSet
    Definition Classes
    IterableOnceExtensionMethods
    Annotations
    @deprecated @inline()
    Deprecated

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

  63. def toStream: immutable.Stream[A]
    Implicit
    This member is added by an implicit conversion from HashSet[A] toIterableOnceExtensionMethods[A] 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:
    (hashSet: IterableOnceExtensionMethods[A]).toStream
    Definition Classes
    IterableOnceExtensionMethods
    Annotations
    @deprecated @inline()
    Deprecated

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

  64. final def toStream: immutable.Stream[A]
    Definition Classes
    IterableOnceOps
    Annotations
    @deprecated @inline()
    Deprecated

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

  65. final def toTraversable: collection.Traversable[A]
    Implicit
    This member is added by an implicit conversion from HashSet[A] toIterableOnceExtensionMethods[A] 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:
    (hashSet: IterableOnceExtensionMethods[A]).toTraversable
    Definition Classes
    IterableOnceExtensionMethods
    Annotations
    @deprecated @inline()
    Deprecated

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

  66. final def toTraversable: collection.Traversable[A]

    Converts this iterable collection to an unspecified Iterable.

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

    returns

    An Iterable containing all elements of this iterable collection.

    Definition Classes
    IterableOps
    Annotations
    @deprecated
    Deprecated

    (Since version 2.13.0) Use toIterable instead

  67. def toVector: immutable.Vector[A]
    Implicit
    This member is added by an implicit conversion from HashSet[A] toIterableOnceExtensionMethods[A] 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:
    (hashSet: IterableOnceExtensionMethods[A]).toVector
    Definition Classes
    IterableOnceExtensionMethods
    Annotations
    @deprecated @inline()
    Deprecated

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

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

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

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

    Definition Classes
    IterableOps
    Annotations
    @deprecated
    Deprecated

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

  69. def withFilter(f: (A) => Boolean): Iterator[A]
    Implicit
    This member is added by an implicit conversion from HashSet[A] toIterableOnceExtensionMethods[A] 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:
    (hashSet: IterableOnceExtensionMethods[A]).withFilter(f)
    Definition Classes
    IterableOnceExtensionMethods
    Annotations
    @deprecated
    Deprecated

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

  70. def [B](y: B): (HashSet[A], B)
    Implicit
    This member is added by an implicit conversion from HashSet[A] toArrowAssoc[HashSet[A]] 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 java.io.Serializable

Inherited from AbstractSet[A]

Inherited from Set[A]

Inherited from SetOps[A, [X]HashSet[X], HashSet[A]]

Inherited from Shrinkable[A]

Inherited from Builder[A, HashSet[A]]

Inherited from Growable[A]

Inherited from Clearable

Inherited from Cloneable[HashSet[A]]

Inherited from java.lang.Cloneable

Inherited from Iterable[A]

Inherited from collection.AbstractSet[A]

Inherited from collection.Set[A]

Inherited from Equals

Inherited from collection.SetOps[A, [_]HashSet[_], HashSet[A]]

Inherited from (A) => Boolean

Inherited from collection.AbstractIterable[A]

Inherited from collection.Iterable[A]

Inherited from IterableFactoryDefaults[A, [x]HashSet[x]]

Inherited from IterableOps[A, [_]HashSet[_], HashSet[A]]

Inherited from IterableOnceOps[A, [_]HashSet[_], HashSet[A]]

Inherited from IterableOnce[A]

Inherited from AnyRef

Inherited from Any

Inherited by implicit conversion iterableOnceExtensionMethods fromHashSet[A] to IterableOnceExtensionMethods[A]

Inherited by implicit conversion any2stringadd fromHashSet[A] to any2stringadd[HashSet[A]]

Inherited by implicit conversion StringFormat fromHashSet[A] to StringFormat[HashSet[A]]

Inherited by implicit conversion Ensuring fromHashSet[A] to Ensuring[HashSet[A]]

Inherited by implicit conversion ArrowAssoc fromHashSet[A] to ArrowAssoc[HashSet[A]]

Ungrouped