HashSet

final class HashSet[A](initialCapacity: Int, loadFactor: Double) extends AbstractSet[A] with SetOps[A, [A] =>> HashSet[A], HashSet[A]] with StrictOptimizedIterableOps[A, [A] =>> HashSet[A], HashSet[A]] with IterableFactoryDefaults[A, [A] =>> HashSet[A]] with Serializable
This class implements mutable sets using a hashtable.
See also
"Scala's Collection Library overview" section on Hash Tables for more information.
Companion
object
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class AbstractSet[A]
trait Set[A]
trait SetOps[A, [A] =>> HashSet[A], HashSet[A]]
trait Shrinkable[A]
trait Builder[A, HashSet[A]]
trait Growable[A]
trait Clearable
trait Cloneable
trait Iterable[A]
class AbstractSet[A]
trait Set[A]
trait Equals
trait SetOps[A, [A] =>> HashSet[A], HashSet[A]]
trait A => Boolean
trait Iterable[A]
trait IterableFactoryDefaults[A, [A] =>> HashSet[A]]
trait IterableOps[A, [A] =>> HashSet[A], HashSet[A]]
trait IterableOnceOps[A, [A] =>> HashSet[A], HashSet[A]]
class Object
trait Matchable
class Any

Value members

Constructors

def this()
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Methods

override def size: Int
Definition Classes
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override def contains(elem: A): Boolean
Definition Classes
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override def sizeHint(size: Int): Unit
Definition Classes
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override def add(elem: A): Boolean
Definition Classes
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override def addAll(xs: IterableOnce[A]): HashSet[A]
Definition Classes
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override def subtractAll(xs: IterableOnce[A]): HashSet[A]
Definition Classes
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override def remove(elem: A): Boolean
Definition Classes
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override def iterator: Iterator[A]
Definition Classes
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override def stepper[S <: Stepper[]](shape: StepperShape[A, S]): S & EfficientSplit
Definition Classes
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override def filterInPlace(p: A => Boolean): HashSet[A]
Definition Classes
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def clear(): Unit
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override def iterableFactory: IterableFactory[[A] =>> HashSet[A]]
Definition Classes
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def addOne(elem: A): HashSet[A]
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def subtractOne(elem: A): HashSet[A]
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override def knownSize: Int
Definition Classes
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override def isEmpty: Boolean
Definition Classes
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override def foreach[U](f: A => U): Unit
Definition Classes
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override def hashCode: Int
Definition Classes
Set -> Any
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Inherited methods

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.
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.
Type Params
B
the result type of the binary operator.
Value Params
op
the binary operator.
Returns
an option value containing the result of reduceRight(op) if this collection is nonempty, None otherwise.
Inhertied from
IterableOnceOps
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def last: A
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.
Throws
NoSuchElementException
NoSuchElementException
Inhertied from
IterableOps
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override def collect[B](pf: PartialFunction[A, B]): HashSet[B]
@deprecated("Use foldLeft instead of /:", "2.13.0") @inline
final def /:[B](z: B)(op: (B, A) => B): B
Inhertied from
IterableOnceOps
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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.
Note: may not terminate for infinite-sized collections.
Note: might return different results for different runs, unless the underlying collection type is ordered.
Value Params
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.
Example
Seq("a", 1, 5L).collectFirst({ case x: Int => x*10 }) = Some(10)
Inhertied from
IterableOnceOps
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def groupMap[K, B](key: A => K)(f: A => B): Map[K, HashSet[B]]
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.
Type Params
B
the type of values returned by the transformation function
K
the type of keys returned by the discriminator function
Value Params
f
the element transformation function
key
the discriminator function
Inhertied from
IterableOps
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def intersect(that: Set[A]): HashSet[A]
Computes the intersection between this set and another set.
Value Params
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.
Inhertied from
SetOps
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final def union(that: Set[A]): HashSet[A]
Computes the union between of set and another set.
Value Params
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.
Inhertied from
SetOps
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override def zip[B](that: IterableOnce[B]): HashSet[(A, B)]
def drop(n: Int): HashSet[A]
Inhertied from
IterableOps
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Inhertied from
IterableOnceOps
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override def partitionMap[A1, A2](f: A => Either[A1, A2]): (HashSet[A1], HashSet[A2])
final def &~(that: Set[A]): HashSet[A]
Alias for diff
Inhertied from
SetOps
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@deprecated("Use .to(LazyList) instead of .toStream", "2.13.0") @inline
final def toStream: Stream[A]
Inhertied from
IterableOnceOps
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@deprecated("Use &- with an explicit collection argument instead of - with varargs", "2.13.0")
def -(elem1: A, elem2: A, elems: A*): HashSet[A]
Inhertied from
SetOps
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@deprecated("Consider requiring an immutable Set or fall back to Set.diff", "2.13.0")
def -(elem: A): HashSet[A]
Inhertied from
SetOps
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@deprecated("Consider requiring an immutable Set", "2.13.0")
def --(that: IterableOnce[A]): HashSet[A]
Inhertied from
SetOps
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def sum[B >: A](num: Numeric[B]): B
Sums up the elements of this collection.
Note: will not terminate for infinite-sized collections.
Type Params
B
the result type of the + operator.
Value Params
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.
Inhertied from
IterableOnceOps
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override def span(p: A => Boolean): (HashSet[A], HashSet[A])
override def flatMap[B](f: A => IterableOnce[B]): HashSet[B]
override def filterNot(pred: A => Boolean): HashSet[A]
An iterator over all subsets of this set.
Returns
the iterator.
Inhertied from
SetOps
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def subsets(len: Int): Iterator[HashSet[A]]
An iterator over all subsets of this set of the given size. If the requested size is impossible, an empty iterator is returned.
Value Params
len
the size of the subsets.
Returns
the iterator.
Inhertied from
SetOps
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@deprecated("Use `--=` aka `subtractAll` instead of varargs `-=`; infix operations with an operand of multiple args will be deprecated", "2.13.3")
def -=(elem1: A, elem2: A, elems: A*): HashSet[A]
Removes two or more elements from this shrinkable collection.
Value Params
elem1
the first element to remove.
elem2
the second element to remove.
elems
the remaining elements to remove.
Returns
the shrinkable collection itself
Inhertied from
Shrinkable
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final def -=(elem: A): HashSet[A]
Alias for subtractOne
Inhertied from
Shrinkable
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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.
Note: will not terminate for infinite-sized collections.
Type Params
B
the type of the elements of that
Value Params
p
the test predicate, which relates elements from both collections
that
the other collection
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
Inhertied from
IterableOnceOps
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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. 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)
Type Params
B
the type of the elements in the resulting collection
Value Params
op
the binary operator applied to the intermediate result and the element
z
the initial value
Returns
collection with intermediate results
Inhertied from
IterableOps
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def fold[A1 >: A](z: A1)(op: (A1, A1) => A1): A1
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.
Type Params
A1
a type parameter for the binary operator, a supertype of A.
Value Params
op
a binary operator that must be associative.
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).
Returns
the result of applying the fold operator op between all the elements and z, or z if this collection is empty.
Inhertied from
IterableOnceOps
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@deprecated("Iterable.seq always returns the iterable itself", "2.13.0")
def seq: HashSet[A]
Inhertied from
Iterable
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def minByOption[B](f: A => B)(cmp: Ordering[B]): Option[A]
Finds the first element which yields the smallest value measured by function f.
Note: will not terminate for infinite-sized collections.
Type Params
B
The result type of the function f.
Value Params
cmp
An ordering to be used for comparing elements.
f
The measuring function.
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.
Inhertied from
IterableOnceOps
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@deprecated("Use `++=` aka `addAll` instead of varargs `+=`; infix operations with an operand of multiple args will be deprecated", "2.13.0") @inline
final def +=(elem1: A, elem2: A, elems: A*): HashSet[A]
Adds two or more elements to this growable collection.
Value Params
elem1
the first element to add.
elem2
the second element to add.
elems
the remaining elements to add.
Returns
the growable collection itself
Inhertied from
Growable
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final def +=(elem: A): HashSet[A]
Alias for addOne
Inhertied from
Growable
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def toArray[B >: A](evidence$1: ClassTag[B]): Array[B]
Convert collection to array.
Implementation note: DO NOT call Array.from from this method.
Inhertied from
IterableOnceOps
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def subsetOf(that: Set[A]): Boolean
Tests whether this set is a subset of another set.
Value Params
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.
Inhertied from
SetOps
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override def filter(pred: A => Boolean): HashSet[A]
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
Example
List(1,2,3).inits = Iterator(List(1,2,3), List(1,2), List(1), Nil)
Inhertied from
IterableOps
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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.)
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.
Value Params
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.
See also
Example
List(1, 2, 3, 4, 5).sliding(2, 2) = Iterator(List(1, 2), List(3, 4), List(5))
List(1, 2, 3, 4, 5, 6).sliding(2, 3) = Iterator(List(1, 2), List(4, 5))
Inhertied from
IterableOps
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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.)
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.
Value Params
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.
See also
Example
List().sliding(2) = empty iterator
List(1).sliding(2) = Iterator(List(1))
List(1, 2).sliding(2) = Iterator(List(1, 2))
List(1, 2, 3).sliding(2) = Iterator(List(1, 2), List(2, 3))
Inhertied from
IterableOps
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def tail: HashSet[A]
The rest of the collection without its first element.
Inhertied from
IterableOps
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@deprecated("`aggregate` is not relevant for sequential collections. Use `foldLeft(z)(seqop)` instead.", "2.13.0")
def aggregate[B](z: => B)(seqop: (B, A) => B, combop: (B, B) => B): B
Inhertied from
IterableOnceOps
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def transpose[B](asIterable: A => Iterable[B]): HashSet[HashSet[B]]
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.
Type Params
B
the type of the elements of each iterable collection.
Value Params
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.
Throws
IllegalArgumentException
IllegalArgumentException
Inhertied from
IterableOps
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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.
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.
Type Params
B
the result type of the binary operator.
Value Params
op
the binary operator.
z
the start value.
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, x1), x2, ..., xn) where x1, ..., xn are the elements of this collection. Returns z if this collection is empty.
Inhertied from
IterableOnceOps
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override def clone(): HashSet[A]
Definition Classes
Inhertied from
SetOps
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def withFilter(p: A => Boolean): WithFilter[A, [A] =>> HashSet[A]]
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.
Value Params
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.
Inhertied from
IterableOps
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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
Value Params
b
the string builder to which elements are appended.
Returns
the string builder b to which elements were appended.
Inhertied from
IterableOnceOps
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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
Value Params
b
the string builder to which elements are appended.
sep
the separator string.
Returns
the string builder b to which elements were appended.
Inhertied from
IterableOnceOps
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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)
Value Params
b
the string builder to which elements are appended.
end
the ending string.
sep
the separator string.
start
the starting string.
Returns
the string builder b to which elements were appended.
Inhertied from
IterableOnceOps
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final def |(that: Set[A]): HashSet[A]
Alias for union
Inhertied from
SetOps
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def toList: List[A]
Inhertied from
IterableOnceOps
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@deprecated("Use toIterable instead", "2.13.0")
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.
Inhertied from
IterableOps
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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.
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.
Type Params
B
the result type of the binary operator.
Value Params
op
the binary operator.
z
the start value.
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(x1, op(x2, ... op(xn, z)...)) where x1, ..., xn are the elements of this collection. Returns z if this collection is empty.
Inhertied from
IterableOnceOps
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override def map[B](f: A => B): HashSet[B]
def toSeq: Seq[A]
Returns
This collection as a Seq[A]. This is equivalent to to(Seq) but might be faster.
Inhertied from
IterableOnceOps
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def minBy[B](f: A => B)(cmp: Ordering[B]): A
Finds the first element which yields the smallest value measured by function f.
Note: will not terminate for infinite-sized collections.
Type Params
B
The result type of the function f.
Value Params
cmp
An ordering to be used for comparing elements.
f
The measuring function.
Returns
the first element of this collection with the smallest value measured by function f with respect to the ordering cmp.
Throws
UnsupportedOperationException
UnsupportedOperationException
Inhertied from
IterableOnceOps
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override def empty: HashSet[A]
override def partition(p: A => Boolean): (HashSet[A], HashSet[A])
final def ++=(xs: IterableOnce[A]): HashSet[A]
Alias for addAll
Inhertied from
Growable
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@deprecatedOverriding("nonEmpty is defined as !isEmpty; override isEmpty instead", "2.13.0")
Tests whether the collection is not empty.
Returns
true if the collection contains at least one element, false otherwise.
Inhertied from
IterableOnceOps
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@deprecated("Check .knownSize instead of .hasDefiniteSize for more actionable information (see scaladoc for details)", "2.13.0")
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.
See also
method knownSize for a more useful alternative
Inhertied from
IterableOnceOps
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def compose[A](g: A => A): A => Boolean
Composes two instances of Function1 in a new Function1, with this function applied last.
Type Params
A
the type to which function g can be applied
Value Params
g
a function A => T1
Returns
a new function f such that f(x) == apply(g(x))
Inhertied from
Function1
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@deprecated("Use ++ with an explicit collection argument instead of + with varargs", "2.13.0")
def +(elem1: A, elem2: A, elems: A*): HashSet[A]
Inhertied from
SetOps
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@deprecated("Consider requiring an immutable Set or fall back to Set.union", "2.13.0")
def +(elem: A): HashSet[A]
Inhertied from
SetOps
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def sizeCompare(that: Iterable[]): Int
Compares the size of this iterable collection to the size of another Iterable.
Value Params
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.
Inhertied from
IterableOps
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def sizeCompare(otherSize: Int): Int
Compares the size of this iterable collection to a test value.
Value Params
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.
See also
Inhertied from
IterableOps
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def mapResult[NewTo](f: HashSet[A] => NewTo): Builder[A, NewTo]
A builder resulting from this builder my mapping the result using f.
Inhertied from
Builder
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override def toString(): String
Definition Classes
Set -> Function1 -> Iterable -> Any
Inhertied from
Set
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override def tapEach[U](f: A => U): HashSet[A]
def lazyZip[B](that: Iterable[B]): LazyZip2[A, B, HashSet[A]]
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)
Type Params
B
the type of the second element in each eventual pair
Value Params
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.
Inhertied from
Iterable
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protected def reversed: Iterable[A]
Inhertied from
IterableOnceOps
Source
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def reduceRight[B >: A](op: (A, B) => B): B
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.
Type Params
B
the result type of the binary operator.
Value Params
op
the binary operator.
Returns
the result of inserting op between consecutive elements of this collection, going right to left: op(x1, op(x2, ..., op(xn-1, xn)...)) where x1, ..., xn are the elements of this collection.
Throws
UnsupportedOperationException
UnsupportedOperationException
Inhertied from
IterableOnceOps
Source
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def min[B >: A](ord: Ordering[B]): A
Finds the smallest element.
Note: will not terminate for infinite-sized collections.
Type Params
B
The type over which the ordering is defined.
Value Params
ord
An ordering to be used for comparing elements.
Returns
the smallest element of this collection with respect to the ordering ord.
Throws
UnsupportedOperationException
UnsupportedOperationException
Inhertied from
IterableOnceOps
Source
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@deprecated("Use `dest ++= coll` instead", "2.13.0") @inline
final def copyToBuffer[B >: A](dest: Buffer[B]): Unit
Inhertied from
IterableOnceOps
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def toMap[K, V](ev: A <:< (K, V)): Map[K, V]
Inhertied from
IterableOnceOps
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def maxByOption[B](f: A => B)(cmp: Ordering[B]): Option[A]
Finds the first element which yields the largest value measured by function f.
Note: will not terminate for infinite-sized collections.
Type Params
B
The result type of the function f.
Value Params
cmp
An ordering to be used for comparing elements.
f
The measuring function.
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.
Inhertied from
IterableOnceOps
Source
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override def splitAt(n: Int): (HashSet[A], HashSet[A])
Definition Classes
Inhertied from
IterableOps
Source
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def groupBy[K](f: A => K): Map[K, HashSet[A]]
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.
Type Params
K
the type of keys returned by the discriminator function.
Value Params
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.
Inhertied from
IterableOps
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def result(): HashSet[A]
Inhertied from
SetOps
Source
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@deprecated("Use .iterator instead of .toIterator", "2.13.0") @inline
final def toIterator: Iterator[A]
Inhertied from
IterableOnceOps
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final def sizeHint(coll: IterableOnce[], delta: Int): Unit
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.
Value Params
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.
Inhertied from
Builder
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def find(p: A => Boolean): Option[A]
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.
Value Params
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.
Inhertied from
IterableOnceOps
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def dropWhile(p: A => Boolean): HashSet[A]
Inhertied from
IterableOps
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final def toIterable: HashSet[A]
Inhertied from
Iterable
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@deprecated("Use iterableFactory instead", "2.13.0") @deprecatedOverriding("Use iterableFactory instead", "2.13.0") @inline
Inhertied from
IterableOps
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def maxBy[B](f: A => B)(cmp: Ordering[B]): A
Finds the first element which yields the largest value measured by function f.
Note: will not terminate for infinite-sized collections.
Type Params
B
The result type of the function f.
Value Params
cmp
An ordering to be used for comparing elements.
f
The measuring function.
Returns
the first element of this collection with the largest value measured by function f with respect to the ordering cmp.
Throws
UnsupportedOperationException
UnsupportedOperationException
Inhertied from
IterableOnceOps
Source
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def andThen[A](g: Boolean => A): A => A
Composes two instances of Function1 in a new Function1, with this function applied first.
Type Params
A
the result type of function g
Value Params
g
a function R => A
Returns
a new function f such that f(x) == g(apply(x))
Inhertied from
Function1
Source
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override def takeRight(n: Int): HashSet[A]
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.
Definition Classes
Inhertied from
StrictOptimizedIterableOps
Source
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override def scanLeft[B](z: B)(op: (B, A) => B): HashSet[B]
def slice(from: Int, until: Int): HashSet[A]
Inhertied from
IterableOps
Source
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override def unzip[A1, A2](asPair: A => (A1, A2)): (HashSet[A1], HashSet[A2])
def grouped(size: Int): Iterator[HashSet[A]]
Partitions elements in fixed size iterable collections.
Value Params
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.
See also
Inhertied from
IterableOps
Source
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def maxOption[B >: A](ord: Ordering[B]): Option[A]
Finds the largest element.
Note: will not terminate for infinite-sized collections.
Type Params
B
The type over which the ordering is defined.
Value Params
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.
Inhertied from
IterableOnceOps
Source
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def product[B >: A](num: Numeric[B]): B
Multiplies up the elements of this collection.
Note: will not terminate for infinite-sized collections.
Type Params
B
the result type of the * operator.
Value Params
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.
Inhertied from
IterableOnceOps
Source
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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. Example uses:
xs.to(List) xs.to(ArrayBuffer) xs.to(BitSet) // for xs: Iterable[Int]
Inhertied from
IterableOnceOps
Source
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@deprecated("Use foldRight instead of :\\", "2.13.0") @inline
final def :\[B](z: B)(op: (A, B) => B): B
Inhertied from
IterableOnceOps
Source
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final def apply(elem: A): Boolean
Tests if some element is contained in this set.
This method is equivalent to contains. It allows sets to be interpreted as predicates.
Value Params
elem
the element to test for membership.
Returns
true if elem is contained in this set, false otherwise.
Inhertied from
SetOps
Source
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def scan[B >: A](z: B)(op: (B, B) => B): HashSet[B]
Computes a prefix scan of the elements of the collection.
Note: The neutral element z may be applied more than once.
Type Params
B
element type of the resulting collection
Value Params
op
the associative operator for the scan
z
neutral element for the operator op
Returns
a new iterable collection containing the prefix scan of the elements in this iterable collection
Inhertied from
IterableOps
Source
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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.
Inhertied from
IterableOps
Source
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def forall(p: A => Boolean): Boolean
Tests whether a predicate holds for all elements of this collection.
Note: may not terminate for infinite-sized collections.
Value Params
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.
Inhertied from
IterableOnceOps
Source
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def diff(that: Set[A]): HashSet[A]
Inhertied from
SetOps
Source
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final def ++[B >: A](suffix: IterableOnce[B]): HashSet[B]
Alias for concat
Inhertied from
IterableOps
Source
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final def ++(that: IterableOnce[A]): HashSet[A]
Alias for concat
Inhertied from
SetOps
Source
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final def &(that: Set[A]): HashSet[A]
Alias for intersect
Inhertied from
SetOps
Source
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def copyToArray[B >: A](xs: Array[B], start: Int, len: Int): Int
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.
Type Params
B
the type of the elements of the array.
Value Params
len
the maximal number of elements to copy.
start
the starting index of xs.
xs
the array to fill.
Returns
the number of elements written to the array
Note
Reuse: After calling this method, one should discard the iterator it was called on. Using it is undefined and subject to change.
Inhertied from
IterableOnceOps
Source
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@deprecatedOverriding("This should always forward to the 3-arg version of this method", since = "2.13.4")
def copyToArray[B >: A](xs: Array[B], start: Int): Int
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.
Type Params
B
the type of the elements of the array.
Value Params
start
the starting index of xs.
xs
the array to fill.
Returns
the number of elements written to the array
Note
Reuse: After calling this method, one should discard the iterator it was called on. Using it is undefined and subject to change.
Inhertied from
IterableOnceOps
Source
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@deprecatedOverriding("This should always forward to the 3-arg version of this method", since = "2.13.4")
def copyToArray[B >: A](xs: Array[B]): Int
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.
Type Params
B
the type of the elements of the array.
Value Params
xs
the array to fill.
Returns
the number of elements written to the array
Note
Reuse: After calling this method, one should discard the iterator it was called on. Using it is undefined and subject to change.
Inhertied from
IterableOnceOps
Source
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def minOption[B >: A](ord: Ordering[B]): Option[A]
Finds the smallest element.
Note: will not terminate for infinite-sized collections.
Type Params
B
The type over which the ordering is defined.
Value Params
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.
Inhertied from
IterableOnceOps
Source
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final def mkString: 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.
Inhertied from
IterableOnceOps
Source
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final def mkString(sep: String): String
Displays all elements of this collection in a string using a separator string.
Delegates to addString, which can be overridden.
Value Params
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.
Example
List(1, 2, 3).mkString("|") = "1|2|3"
Inhertied from
IterableOnceOps
Source
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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.
Delegates to addString, which can be overridden.
Value Params
end
the ending string.
sep
the separator string.
start
the starting 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.
Example
List(1, 2, 3).mkString("(", "; ", ")") = "(1; 2; 3)"
Inhertied from
IterableOnceOps
Source
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def reduceOption[B >: A](op: (B, B) => B): Option[B]
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.
Type Params
B
A type parameter for the binary operator, a supertype of A.
Value Params
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.
Inhertied from
IterableOnceOps
Source
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protected def fromSpecific(coll: IterableOnce[A]): HashSet[A]
def groupMapReduce[K, B](key: A => K)(f: A => B)(reduce: (B, B) => B): Map[K, B]
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 f function and then reduced into a single value with the reduce function.
It is equivalent to groupBy(key).mapValues(_.map(f).reduce(reduce)), but more efficient.
def occurrences[A](as: Seq[A]): Map[A, Int] =
  as.groupMapReduce(identity)(_ => 1)(_ + _)
Note: Even when applied to a view or a lazy collection it will always force the elements.
Inhertied from
IterableOps
Source
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def count(p: A => Boolean): Int
Counts the number of elements in the collection which satisfy a predicate.
Note: will not terminate for infinite-sized collections.
Value Params
p
the predicate used to test elements.
Returns
the number of elements satisfying the predicate p.
Inhertied from
IterableOnceOps
Source
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def canEqual(that: Any): Boolean
Inhertied from
Set
Source
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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. The element type of the iterable collection is the most specific superclass encompassing the element types of the two operands.
Type Params
B
the element type of the returned collection.
Value Params
suffix
the traversable to append.
Returns
a new iterable collection which contains all elements of this iterable collection followed by all elements of suffix.
Inhertied from
IterableOps
Source
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def concat(that: IterableOnce[A]): HashSet[A]
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)
Value Params
that
the collection containing the elements to add.
Returns
a new set with the given elements added, omitting duplicates.
Inhertied from
SetOps
Source
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Definition Classes
Inhertied from
IterableOps
Source
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final def --=(xs: IterableOnce[A]): HashSet[A]
Alias for subtractAll
Inhertied from
Shrinkable
Source
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@deprecated("Use filterInPlace instead", "2.13.0") @inline
final def retain(p: A => Boolean): Unit
Inhertied from
SetOps
Source
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def init: HashSet[A]
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.
Inhertied from
IterableOps
Source
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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
Inhertied from
IterableOps
Source
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@deprecated("Use coll instead of repr in a collection implementation, use the collection value itself from the outside", "2.13.0")
final def repr: HashSet[A]
Inhertied from
IterableOps
Source
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def reduceLeft[B >: A](op: (B, A) => B): B
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.
Type Params
B
the result type of the binary operator.
Value Params
op
the binary operator.
Returns
the result of inserting op between consecutive elements of this collection, going left to right: op( op( ... op(x1, x2) ..., xn-1), xn) where x1, ..., xn are the elements of this collection.
Throws
UnsupportedOperationException
UnsupportedOperationException
Inhertied from
IterableOnceOps
Source
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def toSet[B >: A]: Set[B]
Inhertied from
IterableOnceOps
Source
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def exists(p: A => Boolean): Boolean
Tests whether a predicate holds for at least one element of this collection.
Note: may not terminate for infinite-sized collections.
Value Params
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
Inhertied from
IterableOnceOps
Source
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final def toBuffer[B >: A]: Buffer[B]
Inhertied from
IterableOnceOps
Source
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override def dropRight(n: Int): HashSet[A]
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.
Definition Classes
Inhertied from
StrictOptimizedIterableOps
Source
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def update(elem: A, included: Boolean): Unit
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
Value Params
elem
the element to be added or removed
included
a flag indicating whether element should be included or excluded.
Inhertied from
SetOps
Source
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def takeWhile(p: A => Boolean): HashSet[A]
Takes longest prefix of elements that satisfy a predicate.
Note: might return different results for different runs, unless the underlying collection type is ordered.
Value Params
p
The predicate used to test elements.
Returns
the longest prefix of this iterable collection whose elements all satisfy the predicate p.
Inhertied from
IterableOps
Source
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def take(n: Int): HashSet[A]
Inhertied from
IterableOps
Source
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override def unzip3[A1, A2, A3](asTriple: A => (A1, A2, A3)): (HashSet[A1], HashSet[A2], HashSet[A3])
def zipAll[A1 >: A, B](that: 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. 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.
Value Params
that
the iterable providing the second half of each result pair
thatElem
the element to be used to fill up the result if that is shorter than this iterable collection.
thisElem
the element to be used to fill up the result if this iterable collection is shorter than that.
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.
Inhertied from
IterableOps
Source
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def max[B >: A](ord: Ordering[B]): A
Finds the largest element.
Note: will not terminate for infinite-sized collections.
Type Params
B
The type over which the ordering is defined.
Value Params
ord
An ordering to be used for comparing elements.
Returns
the largest element of this collection with respect to the ordering ord.
Throws
UnsupportedOperationException
UnsupportedOperationException
Inhertied from
IterableOnceOps
Source
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final def sizeHintBounded(size: Int, boundingColl: 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. 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.
Value Params
boundingColl
the bounding collection. If it is an IndexedSeqLike, then sizes larger than collection's size are reduced.
size
the hint how many elements will be added.
Inhertied from
Builder
Source
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override def flatten[B](toIterableOnce: A => IterableOnce[B]): HashSet[B]
@deprecated("Use ++ instead of ++: for collections of type Iterable", "2.13.0")
def ++:[B >: A](that: IterableOnce[B]): HashSet[B]
Inhertied from
IterableOps
Source
(source)
@deprecated("Use .view.slice(from, until) instead of .view(from, until)", "2.13.0")
def view(from: Int, until: Int): View[A]
A view over a slice of the elements of this collection.
Inhertied from
IterableOps
Source
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def view: View[A]
A view over the elements of this collection.
Inhertied from
IterableOps
Source
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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.
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.
Type Params
B
the result type of the binary operator.
Value Params
op
the binary operator.
Returns
an option value containing the result of reduceLeft(op) if this collection is nonempty, None otherwise.
Inhertied from
IterableOnceOps
Source
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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
Example
List(1,2,3).tails = Iterator(List(1,2,3), List(2,3), List(3), Nil)
Inhertied from
IterableOps
Source
(source)
override def equals(that: Any): Boolean
Definition Classes
Set -> Equals -> Any
Inhertied from
Set
Source
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def reduce[B >: A](op: (B, B) => B): B
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.
Type Params
B
A type parameter for the binary operator, a supertype of A.
Value Params
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.
Throws
UnsupportedOperationException
UnsupportedOperationException
Inhertied from
IterableOnceOps
Source
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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.
Inhertied from
IterableOps
Source
(source)