Scala Library: scala.collection.AbstractSet
scala.collection.AbstractSet
Explicit instantiation of the Set
trait to reduce class file size in
subclasses.
Type Members
type Self = Set[A]
The type implementing this traversable
- Attributes
- protected[this]
- Definition Classes
- TraversableLike
class WithFilter extends FilterMonadic[A, Repr]
A class supporting filtered operations. Instances of this class are returned by
method withFilter
.
- Definition Classes
- TraversableLike
Concrete Value Members From scala.Function1
def andThen[A](g: (Boolean) ⇒ A): (A) ⇒ A
Composes two instances of Function1 in a new Function1, with this function applied first.
- A
- the result type of function
g
- the result type of function
- g
- a function R => A
- returns
- a new function
f
such thatf(x) == g(apply(x))
- a new function
- Definition Classes
- Function1
- Annotations
- @ unspecialized ()
(defined at scala.Function1)
def compose[A](g: (A) ⇒ A): (A) ⇒ Boolean
Composes two instances of Function1 in a new Function1, with this function applied last.
- A
- the type to which function
g
can be applied
- the type to which function
- g
- a function A => T1
- returns
- a new function
f
such thatf(x) == apply(g(x))
- a new function
- Definition Classes
- Function1
- Annotations
- @ unspecialized ()
(defined at scala.Function1)
Instance Constructors From scala.collection.AbstractSet
new AbstractSet()
(defined at scala.collection.AbstractSet)
Concrete Value Members From scala.collection.GenSetLike
abstract def iterator: Iterator[A]
- Definition Classes
- GenSetLike → GenIterableLike
(defined at scala.collection.GenSetLike)
def &(that: GenSet[A]): Set[A]
Computes the intersection between this set and another set.
Note: Same as intersect
.
- 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
.
- a new set consisting of all elements that are both in this set and in the
given set
- Definition Classes
- GenSetLike
(defined at scala.collection.GenSetLike)
def &~(that: GenSet[A]): Set[A]
The difference of this set and another set.
Note: Same as diff
.
- 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
.
- a set containing those elements of this set that are not also contained in
the given set
- Definition Classes
- GenSetLike
(defined at scala.collection.GenSetLike)
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.
- elem
- the element to test for membership.
- returns
true
ifelem
is contained in this set,false
otherwise.
- Definition Classes
- GenSetLike → Function1
(defined at scala.collection.GenSetLike)
def equals(that: Any): Boolean
Compares this set with another object for equality.
Note: This operation contains an unchecked cast: if that
is a set, it will
assume with an unchecked cast that it has the same element type as this set. Any
subsequent ClassCastException is treated as a false
result.
- that
- the other object
- returns
true
ifthat
is a set which contains the same elements as this set.
- Definition Classes
- GenSetLike → Equals → AnyRef → Any
(defined at scala.collection.GenSetLike)
def intersect(that: GenSet[A]): Set[A]
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
.
- a new set consisting of all elements that are both in this set and in the
given set
- Definition Classes
- GenSetLike
(defined at scala.collection.GenSetLike)
def subsetOf(that: GenSet[A]): Boolean
Tests whether this set is a subset of another set.
- that
- the set to test.
- returns
true
if this set is a subset ofthat
, i.e. if every element of this set is also an element ofthat
.
- Definition Classes
- GenSetLike
(defined at scala.collection.GenSetLike)
def |(that: GenSet[A]): Set[A]
Computes the union between this set and another set.
Note: Same as union
.
- 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
.
- a new set consisting of all elements that are in this set or in the given
set
- Definition Classes
- GenSetLike
(defined at scala.collection.GenSetLike)
Concrete Value Members From scala.collection.IterableLike
def canEqual(that: Any): Boolean
Method called from equality methods, so that user-defined subclasses can refuse to be equal to other collections of the same kind.
- that
- The object with which this iterable collection should be compared
- returns
true
, if this iterable collection can possibly equalthat
,false
otherwise. The test takes into consideration only the run-time types of objects but ignores their elements.
- Definition Classes
- IterableLike → Equals
(defined at scala.collection.IterableLike)
def copyToArray[B >: A](xs: Array[B], start: Int, len: Int): Unit
[use case]
Copies the elements of this set to an array. Fills the given array xs
with at
most len
elements of this set, starting at position start
. Copying will
stop once either the end of the current set is reached, or the end of the target
array is reached, or len
elements have been copied.
- xs
- the array to fill.
- start
- the starting index.
- len
- the maximal number of elements to copy.
- Definition Classes
- IterableLike → TraversableLike → TraversableOnce → GenTraversableOnce
(defined at scala.collection.IterableLike)
def drop(n: Int): Set[A]
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 thann
elements.
- a iterable collection consisting of all elements of this iterable collection
except the first
- Definition Classes
- IterableLike → TraversableLike → GenTraversableLike
(defined at scala.collection.IterableLike)
def dropRight(n: Int): Set[A]
Selects all elements except last n ones.
Note: might return different results for different runs, unless the underlying collection type is ordered.
- n
- The number of elements to take
- 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 thann
elements.
- a iterable collection consisting of all elements of this iterable collection
except the last
- Definition Classes
- IterableLike
(defined at scala.collection.IterableLike)
def exists(p: (A) ⇒ Boolean): Boolean
Tests whether a predicate holds for at least one element of this iterable collection.
Note: may not terminate for infinite-sized collections.
- p
- the predicate used to test elements.
- returns
false
if this iterable collection is empty, otherwisetrue
if the given predicatep
holds for some of the elements of this iterable collection, otherwisefalse
- Definition Classes
- IterableLike → TraversableLike → TraversableOnce → GenTraversableOnce
(defined at scala.collection.IterableLike)
def find(p: (A) ⇒ Boolean): Option[A]
Finds the first element of the iterable 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 iterable collection that
satisfies
p
, orNone
if none exists.
- an option value containing the first element in the iterable collection that
satisfies
- Definition Classes
- IterableLike → TraversableLike → TraversableOnce → GenTraversableOnce
(defined at scala.collection.IterableLike)
def foldRight[B](z: B)(op: (A, B) ⇒ B): B
Applies a binary operator to all elements of this iterable 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 iterable collection, going right to left with the start valuez
on the right:
- the result of inserting
where `x1, ..., xn` are the elements of this iterable collection. Returns
`z` if this iterable collection is empty.
- Definition Classes
- IterableLike → TraversableOnce → GenTraversableOnce
(defined at scala.collection.IterableLike)
def forall(p: (A) ⇒ Boolean): Boolean
Tests whether a predicate holds for all elements of this iterable collection.
Note: may not terminate for infinite-sized collections.
- p
- the predicate used to test elements.
- returns
true
if this iterable collection is empty or the given predicatep
holds for all elements of this iterable collection, otherwisefalse
.
- Definition Classes
- IterableLike → TraversableLike → TraversableOnce → GenTraversableOnce
(defined at scala.collection.IterableLike)
def foreach[U](f: (A) ⇒ U): Unit
[use case]
Applies a function f
to all elements of this set.
Note: this method underlies the implementation of most other bulk operations. Subclasses should re-implement this method if a more efficient implementation exists.
- f
- the function that is applied for its side-effect to every element. The
result of function
f
is discarded.
- the function that is applied for its side-effect to every element. The
result of function
- Definition Classes
- IterableLike → TraversableLike → GenTraversableLike → TraversableOnce → GenTraversableOnce → FilterMonadic
(defined at scala.collection.IterableLike)
def grouped(size: Int): Iterator[Set[A]]
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 sizesize
if the elements don’t divide evenly.
- An iterator producing iterable collections of size
- Definition Classes
- IterableLike
- See also
- scala.collection.Iterator, method
grouped
- scala.collection.Iterator, method
(defined at scala.collection.IterableLike)
def reduceRight[B >: A](op: (A, B) ⇒ B): B
Applies a binary operator to all elements of this iterable 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 iterable collection, going right to left:
- the result of inserting
where `x1, ..., xn` are the elements of this iterable collection.
- Definition Classes
- IterableLike → TraversableOnce → GenTraversableOnce
- Exceptions thrown
- UnsupportedOperationException if this iterable collection is empty.
(defined at scala.collection.IterableLike)
def sameElements[B >: A](that: GenIterable[B]): Boolean
[use case]
Checks if the other iterable collection contains the same elements in the same order as this set.
Note: might return different results for different runs, unless the underlying collection type is ordered.
- that
- the collection to compare with.
- returns
true
, if both collections contain the same elements in the same order,false
otherwise.
- Definition Classes
- IterableLike → GenIterableLike
(defined at scala.collection.IterableLike)
def slice(from: Int, until: Int): Set[A]
Selects an interval of elements. The returned collection is made up of all
elements x
which satisfy the invariant:
Note: might return different results for different runs, unless the underlying collection type is ordered.
- returns
- a iterable collection containing the elements greater than or equal to index
from
extending up to (but not including) indexuntil
of this iterable collection.
- a iterable collection containing the elements greater than or equal to index
- Definition Classes
- IterableLike → TraversableLike → GenTraversableLike
(defined at scala.collection.IterableLike)
def sliding(size: Int): Iterator[Set[A]]
Groups elements in fixed size blocks by passing a “sliding window” over them (as opposed to partitioning them, as is done in grouped.) “Sliding window” step is 1 by default.
- size
- the number of elements per group
- returns
- An iterator producing iterable collections of size
size
, except the last and the only element will be truncated if there are fewer elements than size.
- An iterator producing iterable collections of size
- Definition Classes
- IterableLike
- See also
- scala.collection.Iterator, method
sliding
- scala.collection.Iterator, method
(defined at scala.collection.IterableLike)
def sliding(size: Int, step: Int): Iterator[Set[A]]
Groups elements in fixed size blocks by passing a “sliding window” over them (as opposed to partitioning them, as is done in grouped.)
- 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 and the only element will be truncated if there are fewer elements than size.
- An iterator producing iterable collections of size
- Definition Classes
- IterableLike
- See also
- scala.collection.Iterator, method
sliding
- scala.collection.Iterator, method
(defined at scala.collection.IterableLike)
def take(n: Int): Set[A]
Selects 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 thann
elements.
- a iterable collection consisting only of the first
- Definition Classes
- IterableLike → TraversableLike → GenTraversableLike
(defined at scala.collection.IterableLike)
def takeRight(n: Int): Set[A]
Selects last n elements.
Note: might return different results for different runs, unless the underlying collection type is ordered.
- n
- the number of elements to take
- 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 thann
elements.
- a iterable collection consisting only of the last
- Definition Classes
- IterableLike
(defined at scala.collection.IterableLike)
def takeWhile(p: (A) ⇒ Boolean): Set[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.
- returns
- the longest prefix of this iterable collection whose elements all satisfy
the predicate
p
.
- the longest prefix of this iterable collection whose elements all satisfy
the predicate
- Definition Classes
- IterableLike → TraversableLike → GenTraversableLike
(defined at scala.collection.IterableLike)
def toCollection(repr: Set[A]): Iterable[A]
A conversion from collections of type Repr
to Iterable
objects. By default
this is implemented as just a cast, but this can be overridden.
- Attributes
- protected[this]
- Definition Classes
- IterableLike → TraversableLike
(defined at scala.collection.IterableLike)
def toStream: immutable.Stream[A]
Converts this iterable collection to a stream.
- returns
- a stream containing all elements of this iterable collection.
- Definition Classes
- IterableLike → TraversableLike → GenTraversableOnce
(defined at scala.collection.IterableLike)
def view(from: Int, until: Int): IterableView[A, Set[A]]
Creates a non-strict view of a slice of this iterable collection.
Note: the difference between view
and slice
is that view
produces a view
of the current iterable collection, whereas slice
produces a new iterable
collection.
Note: view(from, to)
is equivalent to view.slice(from, to)
Note: might return different results for different runs, unless the underlying collection type is ordered.
- from
- the index of the first element of the view
- until
- the index of the element following the view
- returns
- a non-strict view of a slice of this iterable collection, starting at index
from
and extending up to (but not including) indexuntil
.
- a non-strict view of a slice of this iterable collection, starting at index
- Definition Classes
- IterableLike → TraversableLike
(defined at scala.collection.IterableLike)
def view: IterableView[A, Set[A]]
Creates a non-strict view of this iterable collection.
- returns
- a non-strict view of this iterable collection.
- Definition Classes
- IterableLike → TraversableLike
(defined at scala.collection.IterableLike)
def zipAll[B, A1 >: A, That](that: GenIterable[B], thisElem: A1, thatElem: B)(implicit bf: CanBuildFrom[Set[A], (A1, B), That]): That
[use case]
Returns a set formed from this set and another iterable collection by combining corresponding elements in pairs. If one of the two collections is shorter than the other, placeholder elements are used to extend the shorter collection to the length of the longer.
Note: might return different results for different runs, unless the underlying collection type is ordered.
- B
- the type of the second half of the returned pairs
- that
- The iterable providing the second half of each result pair
- thisElem
- the element to be used to fill up the result if this set is shorter than
that
.
- the element to be used to fill up the result if this set is shorter than
- thatElem
- the element to be used to fill up the result if
that
is shorter than this set.
- the element to be used to fill up the result if
- returns
- a new set containing pairs consisting of corresponding elements of this set
and
that
. The length of the returned collection is the maximum of the lengths of this set andthat
. If this set is shorter thanthat
,thisElem
values are used to pad the result. Ifthat
is shorter than this set,thatElem
values are used to pad the result.
- a new set containing pairs consisting of corresponding elements of this set
and
- Definition Classes
- IterableLike → GenIterableLike
(defined at scala.collection.IterableLike)
def zipWithIndex[A1 >: A, That](implicit bf: CanBuildFrom[Set[A], (A1, Int), That]): That
[use case]
Zips this set with its indices.
Note: might return different results for different runs, unless the underlying collection type is ordered.
- returns
- A new set containing pairs consisting of all elements of this set paired
with their index. Indices start at
0
.
- A new set containing pairs consisting of all elements of this set paired
with their index. Indices start at
- Definition Classes
- IterableLike → GenIterableLike
Example:
(defined at scala.collection.IterableLike)
def zip[A1 >: A, B, That](that: GenIterable[B])(implicit bf: CanBuildFrom[Set[A], (A1, B), That]): That
[use case]
Returns a set formed from this set and another iterable collection by combining corresponding elements in pairs. If one of the two collections is longer than the other, its remaining elements are ignored.
Note: might return different results for different runs, unless the underlying collection type is ordered.
- B
- the type of the second half of the returned pairs
- that
- The iterable providing the second half of each result pair
- returns
- a new set containing pairs consisting of corresponding elements of this set
and
that
. The length of the returned collection is the minimum of the lengths of this set andthat
.
- a new set containing pairs consisting of corresponding elements of this set
and
- Definition Classes
- IterableLike → GenIterableLike
(defined at scala.collection.IterableLike)
Concrete Value Members From scala.collection.Parallelizable
def par: ParSet[A]
Returns a parallel implementation of this collection.
For most collection types, this method creates a new parallel collection by
copying all the elements. For these collection, par
takes linear time. Mutable
collections in this category do not produce a mutable parallel collection that
has the same underlying dataset, so changes in one collection will not be
reflected in the other one.
Specific collections (e.g. ParArray
or mutable.ParHashMap
) override this
default behaviour by creating a parallel collection which shares the same
underlying dataset. For these collections, par
takes constant or sublinear
time.
All parallel collections return a reference to themselves.
- returns
- a parallel implementation of this collection
- Definition Classes
- Parallelizable
(defined at scala.collection.Parallelizable)
Concrete Value Members From scala.collection.Set
def companion: GenericCompanion[Set]
The factory companion object that builds instances of class Set. (or its
Iterable
superclass where class Set is not a Seq
.)
- Definition Classes
- Set → GenSet → Iterable → GenIterable → Traversable → GenTraversable → GenericTraversableTemplate
(defined at scala.collection.Set)
def seq: Set[A]
A version of this collection with all of the operations implemented sequentially (i.e., in a single-threaded manner).
This method returns a reference to this collection. In parallel collections, it is redefined to return a sequential implementation of this collection. In both cases, it has O(1) complexity.
- returns
- a sequential view of the collection.
- Definition Classes
- Set → GenSet → GenSetLike → Iterable → GenIterable → Traversable → GenTraversable → Parallelizable → TraversableOnce → GenTraversableOnce
(defined at scala.collection.Set)
Abstract Value Members From scala.collection.SetLike
abstract def +(elem: A): Set[A]
Creates a new set with an additional element, unless the element is already present.
- elem
- the element to be added
- returns
- a new set that contains all elements of this set and that also contains
elem
.
- a new set that contains all elements of this set and that also contains
- Definition Classes
- SetLike → GenSetLike
(defined at scala.collection.SetLike)
abstract def -(elem: A): Set[A]
Creates a new set with a given element removed from this set.
- elem
- the element to be removed
- returns
- a new set that contains all elements of this set but that does not contain
elem
.
- a new set that contains all elements of this set but that does not contain
- Definition Classes
- SetLike → Subtractable → GenSetLike
(defined at scala.collection.SetLike)
abstract def contains(elem: A): Boolean
Tests if some element is contained in this set.
- elem
- the element to test for membership.
- returns
true
ifelem
is contained in this set,false
otherwise.
- Definition Classes
- SetLike → GenSetLike
(defined at scala.collection.SetLike)
Concrete Value Members From scala.collection.SetLike
def +(elem1: A, elem2: A, elems: A*): Set[A]
Creates a new set with additional elements, omitting duplicates.
This method takes two or more elements to be added. Elements that already exist in the set will not be added. Another overloaded variant of this method handles the case where a single element is added.
Example:
- elem1
- the first element to add.
- elem2
- the second element to add.
- elems
- the remaining elements to add.
- returns
- a new set with the given elements added, omitting duplicates.
- Definition Classes
- SetLike
(defined at scala.collection.SetLike)
def ++(elems: GenTraversableOnce[A]): Set[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:
- elems
- the collection containing the elements to add.
- returns
- a new set with the given elements added, omitting duplicates.
- Definition Classes
- SetLike
(defined at scala.collection.SetLike)
def diff(that: GenSet[A]): Set[A]
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
.
- a set containing those elements of this set that are not also contained in
the given set
- Definition Classes
- SetLike → GenSetLike
(defined at scala.collection.SetLike)
def map[B, That](f: (A) ⇒ B)(implicit bf: CanBuildFrom[Set[A], B, That]): That
[use case]
Builds a new collection by applying a function to all elements of this set.
- B
- the element type of the returned collection.
- f
- the function to apply to each element.
- returns
- a new set resulting from applying the given function
f
to each element of this set and collecting the results.
- a new set resulting from applying the given function
- Definition Classes
- SetLike → TraversableLike → GenTraversableLike → FilterMonadic
(defined at scala.collection.SetLike)
def newBuilder: Builder[A, Set[A]]
A common implementation of newBuilder
for all sets in terms of empty
.
Overridden for mutable sets in mutable.SetLike
.
- Attributes
- protected[this]
- Definition Classes
- SetLike → TraversableLike → HasNewBuilder
(defined at scala.collection.SetLike)
def parCombiner: Combiner[A, ParSet[A]]
The default par
implementation uses the combiner provided by this method to
create a new parallel collection.
- returns
- a combiner for the parallel collection of type
ParRepr
- a combiner for the parallel collection of type
- Attributes
- protected[this]
- Definition Classes
- SetLike → TraversableLike → Parallelizable
(defined at scala.collection.SetLike)
def subsets(): Iterator[Set[A]]
An iterator over all subsets of this set.
- returns
- the iterator.
- Definition Classes
- SetLike
(defined at scala.collection.SetLike)
def subsets(len: Int): Iterator[Set[A]]
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
- SetLike
(defined at scala.collection.SetLike)
def toBuffer[A1 >: A]: Buffer[A1]
Uses the contents of this set to create a new mutable buffer.
- returns
- a buffer containing all elements of this set.
- Definition Classes
- SetLike → TraversableOnce → GenTraversableOnce
(defined at scala.collection.SetLike)
def union(that: GenSet[A]): Set[A]
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
.
- a new set consisting of all elements that are in this set or in the given
set
- Definition Classes
- SetLike → GenSetLike
(defined at scala.collection.SetLike)
Concrete Value Members From scala.collection.TraversableLike
def ++:[B >: A, That](that: Traversable[B])(implicit bf: CanBuildFrom[Set[A], B, That]): That
As with ++
, returns a new collection containing the elements from the left
operand followed by the elements from the right operand.
It differs from ++
in that the right operand determines the type of the
resulting collection rather than the left one. Mnemonic: the COLon is on the
side of the new COLlection type.
Example:
This overload exists because: for the implementation of ++:
we should reuse
that of ++
because many collections override it with more efficient versions.
Since TraversableOnce
has no ++
method, we have to implement that directly,
but Traversable
and down can use the overload.
- B
- the element type of the returned collection.
- That
- the class of the returned collection. Where possible,
That
is the same class as the current collection classRepr
, but this depends on the element typeB
being admissible for that class, which means that an implicit instance of typeCanBuildFrom[Repr, B, That]
is found.
- the class of the returned collection. Where possible,
- that
- the traversable to append.
- bf
- an implicit value of class
CanBuildFrom
which determines the result classThat
from the current representation typeRepr
and and the new element typeB
.
- an implicit value of class
- returns
- a new collection of type
That
which contains all elements of this traversable collection followed by all elements ofthat
.
- a new collection of type
- Definition Classes
- TraversableLike
(defined at scala.collection.TraversableLike)
def ++:[B >: A, That](that: TraversableOnce[B])(implicit bf: CanBuildFrom[Set[A], B, That]): That
[use case]
As with ++
, returns a new collection containing the elements from the left
operand followed by the elements from the right operand.
It differs from ++
in that the right operand determines the type of the
resulting collection rather than the left one. Mnemonic: the COLon is on the
side of the new COLlection type.
Example:
- B
- the element type of the returned collection.
- that
- the traversable to append.
- returns
- a new set which contains all elements of this set followed by all elements
of
that
.
- a new set which contains all elements of this set followed by all elements
of
- Definition Classes
- TraversableLike
(defined at scala.collection.TraversableLike)
def ++[B >: A, That](that: GenTraversableOnce[B])(implicit bf: CanBuildFrom[Set[A], B, That]): That
[use case]
Returns a new set containing the elements from the left hand operand followed by the elements from the right hand operand. The element type of the set is the most specific superclass encompassing the element types of the two operands.
Example:
- B
- the element type of the returned collection.
- that
- the traversable to append.
- returns
- a new set which contains all elements of this set followed by all elements
of
that
.
- a new set which contains all elements of this set followed by all elements
of
- Definition Classes
- TraversableLike → GenTraversableLike
(defined at scala.collection.TraversableLike)
def collect[B, That](pf: PartialFunction[A, B])(implicit bf: CanBuildFrom[Set[A], B, That]): That
[use case]
Builds a new collection by applying a partial function to all elements of this set on which the function is defined.
- B
- the element type of the returned collection.
- pf
- the partial function which filters and maps the set.
- returns
- a new set resulting from applying the given partial function
pf
to each element on which it is defined and collecting the results. The order of the elements is preserved.
- a new set resulting from applying the given partial function
- Definition Classes
- TraversableLike → GenTraversableLike
(defined at scala.collection.TraversableLike)
def dropWhile(p: (A) ⇒ Boolean): Set[A]
Drops longest prefix of elements that satisfy a predicate.
Note: might return different results for different runs, unless the underlying collection type is ordered.
- returns
- the longest suffix of this traversable collection whose first element does
not satisfy the predicate
p
.
- the longest suffix of this traversable collection whose first element does
not satisfy the predicate
- Definition Classes
- TraversableLike → GenTraversableLike
(defined at scala.collection.TraversableLike)
def filter(p: (A) ⇒ Boolean): Set[A]
Selects all elements of this traversable collection which satisfy a predicate.
- p
- the predicate used to test elements.
- returns
- a new traversable collection consisting of all elements of this traversable
collection that satisfy the given predicate
p
. The order of the elements is preserved.
- a new traversable collection consisting of all elements of this traversable
collection that satisfy the given predicate
- Definition Classes
- TraversableLike → GenTraversableLike
(defined at scala.collection.TraversableLike)
def filterNot(p: (A) ⇒ Boolean): Set[A]
Selects all elements of this traversable collection which do not satisfy a predicate.
- p
- the predicate used to test elements.
- returns
- a new traversable collection consisting of all elements of this traversable
collection that do not satisfy the given predicate
p
. The order of the elements is preserved.
- a new traversable collection consisting of all elements of this traversable
collection that do not satisfy the given predicate
- Definition Classes
- TraversableLike → GenTraversableLike
(defined at scala.collection.TraversableLike)
def flatMap[B, That](f: (A) ⇒ GenTraversableOnce[B])(implicit bf: CanBuildFrom[Set[A], B, That]): That
[use case]
Builds a new collection by applying a function to all elements of this set and using the elements of the resulting collections.
For example:
The type of the resulting collection is guided by the static type of set. This might cause unexpected results sometimes. For example:
- B
- the element type of the returned collection.
- f
- the function to apply to each element.
- returns
- a new set resulting from applying the given collection-valued function
f
to each element of this set and concatenating the results.
- a new set resulting from applying the given collection-valued function
- Definition Classes
- TraversableLike → GenTraversableLike → FilterMonadic
(defined at scala.collection.TraversableLike)
def groupBy[K](f: (A) ⇒ K): immutable.Map[K, Set[A]]
Partitions this traversable collection into a map of traversable collections according to some discriminator function.
Note: this method is not re-implemented by views. This means when applied to a view it will always force the view and return a new traversable collection.
- K
- the type of keys returned by the discriminator function.
- f
- the discriminator function.
- returns
- A map from keys to traversable collections such that the following invariant holds:
That is, every key `k` is bound to a traversable collection of those
elements `x` for which `f(x)` equals `k` .
- Definition Classes
- TraversableLike → GenTraversableLike
(defined at scala.collection.TraversableLike)
def init: Set[A]
Selects all elements except the last.
Note: might return different results for different runs, unless the underlying collection type is ordered.
- returns
- a traversable collection consisting of all elements of this traversable collection except the last one.
- Definition Classes
- TraversableLike → GenTraversableLike
- Exceptions thrown
- UnsupportedOperationException if the traversable collection is empty.
(defined at scala.collection.TraversableLike)
def inits: Iterator[Set[A]]
Iterates over the inits of this traversable collection. The first value will be
this traversable collection and the final one will be an empty traversable
collection, with the intervening values the results of successive applications
of init
.
- returns
- an iterator over all the inits of this traversable collection
- Definition Classes
- TraversableLike
Example:
(defined at scala.collection.TraversableLike)
def partition(p: (A) ⇒ Boolean): (Set[A], Set[A])
Partitions this traversable collection in two traversable collections according to a predicate.
- p
- the predicate on which to partition.
- returns
- a pair of traversable collections: the first traversable collection consists
of all elements that satisfy the predicate
p
and the second traversable collection consists of all elements that don’t. The relative order of the elements in the resulting traversable collections is the same as in the original traversable collection.
- a pair of traversable collections: the first traversable collection consists
of all elements that satisfy the predicate
- Definition Classes
- TraversableLike → GenTraversableLike
(defined at scala.collection.TraversableLike)
def repr: Set[A]
The collection of type traversable collection underlying this TraversableLike
object. By default this is implemented as the TraversableLike
object itself,
but this can be overridden.
- Definition Classes
- TraversableLike → GenTraversableLike
(defined at scala.collection.TraversableLike)
def scanLeft[B, That](z: B)(op: (B, A) ⇒ B)(implicit bf: CanBuildFrom[Set[A], B, That]): That
Produces a collection containing cumulative results of applying the operator 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.
- B
- the type of the elements in the resulting collection
- That
- the actual type of the resulting collection
- z
- the initial value
- op
- the binary operator applied to the intermediate result and the element
- bf
- an implicit value of class
CanBuildFrom
which determines the result classThat
from the current representation typeRepr
and and the new element typeB
.
- an implicit value of class
- returns
- collection with intermediate results
- Definition Classes
- TraversableLike → GenTraversableLike
(defined at scala.collection.TraversableLike)
def scanRight[B, That](z: B)(op: (A, B) ⇒ B)(implicit bf: CanBuildFrom[Set[A], B, That]): That
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.
Example:
- B
- the type of the elements in the resulting collection
- That
- the actual type of the resulting collection
- z
- the initial value
- op
- the binary operator applied to the intermediate result and the element
- bf
- an implicit value of class
CanBuildFrom
which determines the result classThat
from the current representation typeRepr
and and the new element typeB
.
- an implicit value of class
- returns
- collection with intermediate results
- Definition Classes
- TraversableLike → GenTraversableLike
- Annotations
- @migration
- Migration
- (Changed in version 2.9.0) The behavior of
scanRight
has changed. The previous behavior can be reproduced with scanRight.reverse.
- (Changed in version 2.9.0) The behavior of
(defined at scala.collection.TraversableLike)
def scan[B >: A, That](z: B)(op: (B, B) ⇒ B)(implicit cbf: CanBuildFrom[Set[A], B, That]): That
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
- That
- type of the resulting collection
- z
- neutral element for the operator
op
- neutral element for the operator
- op
- the associative operator for the scan
- cbf
- combiner factory which provides a combiner
- returns
- a new traversable collection containing the prefix scan of the elements in this traversable collection
- Definition Classes
- TraversableLike → GenTraversableLike
(defined at scala.collection.TraversableLike)
def span(p: (A) ⇒ Boolean): (Set[A], Set[A])
Splits this traversable 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.
- returns
- a pair consisting of the longest prefix of this traversable collection whose
elements all satisfy
p
, and the rest of this traversable collection.
- a pair consisting of the longest prefix of this traversable collection whose
elements all satisfy
- Definition Classes
- TraversableLike → GenTraversableLike
(defined at scala.collection.TraversableLike)
def splitAt(n: Int): (Set[A], Set[A])
Splits this traversable collection into two 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 traversable collections consisting of the first
n
elements of this traversable collection, and the other elements.
- a pair of traversable collections consisting of the first
- Definition Classes
- TraversableLike → GenTraversableLike
(defined at scala.collection.TraversableLike)
def tail: Set[A]
Selects all elements except the first.
Note: might return different results for different runs, unless the underlying collection type is ordered.
- returns
- a traversable collection consisting of all elements of this traversable collection except the first one.
- Definition Classes
- TraversableLike → GenTraversableLike
- Exceptions thrown
UnsupportedOperationException
if the traversable collection is empty.
(defined at scala.collection.TraversableLike)
def tails: Iterator[Set[A]]
Iterates over the tails of this traversable collection. The first value will be
this traversable collection and the final one will be an empty traversable
collection, with the intervening values the results of successive applications
of tail
.
- returns
- an iterator over all the tails of this traversable collection
- Definition Classes
- TraversableLike
Example:
(defined at scala.collection.TraversableLike)
def withFilter(p: (A) ⇒ Boolean): FilterMonadic[A, Set[A]]
Creates a non-strict filter of this traversable 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 supportsmap
,flatMap
,foreach
, andwithFilter
operations. All these operations apply to those elements of this traversable collection which satisfy the predicatep
.
- an object of class
- Definition Classes
- TraversableLike → FilterMonadic
(defined at scala.collection.TraversableLike)
Concrete Value Members From scala.collection.TraversableOnce
def /:[B](z: B)(op: (B, A) ⇒ B): B
Applies a binary operator to a start value and all elements of this traversable or iterator, going left to right.
Note: /:
is alternate syntax for foldLeft
; z /: xs
is the same as
xs foldLeft z
.
Examples:
Note that the folding function used to compute b is equivalent to that used to compute c.
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 traversable or iterator, going left to right with the start valuez
on the left:
- the result of inserting
where `x1, ..., xn` are the elements of this traversable or iterator.
- Definition Classes
- TraversableOnce → GenTraversableOnce
(defined at scala.collection.TraversableOnce)
def :\[B](z: B)(op: (A, B) ⇒ B): B
Applies a binary operator to all elements of this traversable or iterator and a start value, going right to left.
Note: :\
is alternate syntax for foldRight
; xs :\ z
is the same as
xs foldRight z
.
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.
Examples:
Note that the folding function used to compute b is equivalent to that used to compute c.
- 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 traversable or iterator, going right to left with the start valuez
on the right:
- the result of inserting
where `x1, ..., xn` are the elements of this traversable or iterator.
- Definition Classes
- TraversableOnce → GenTraversableOnce
(defined at scala.collection.TraversableOnce)
def addString(b: StringBuilder): StringBuilder
Appends all elements of this traversable or iterator to a string builder. The
written text consists of the string representations (w.r.t. the method
toString
) of all elements of this traversable or iterator without any
separator string.
Example:
- b
- the string builder to which elements are appended.
- returns
- the string builder
b
to which elements were appended.
- the string builder
- Definition Classes
- TraversableOnce
(defined at scala.collection.TraversableOnce)
def addString(b: StringBuilder, sep: String): StringBuilder
Appends all elements of this traversable or iterator 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 traversable or iterator,
separated by the string sep
.
Example:
- b
- the string builder to which elements are appended.
- sep
- the separator string.
- returns
- the string builder
b
to which elements were appended.
- the string builder
- Definition Classes
- TraversableOnce
(defined at scala.collection.TraversableOnce)
def addString(b: StringBuilder, start: String, sep: String, end: String): StringBuilder
Appends all elements of this traversable or iterator 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 traversable or iterator
are separated by the string sep
.
Example:
- 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.
- the string builder
- Definition Classes
- TraversableOnce
(defined at scala.collection.TraversableOnce)
def aggregate[B](z: ⇒ B)(seqop: (B, A) ⇒ B, combop: (B, B) ⇒ B): B
Aggregates the results of applying an operator to subsequent elements.
This is a more general form of fold
and reduce
. It is similar to
foldLeft
in that it doesn’t require the result to be a supertype of the
element type. In addition, it allows parallel collections to be processed in
chunks, and then combines the intermediate results.
aggregate
splits the traversable or iterator into partitions and processes
each partition by sequentially applying seqop
, starting with z
(like
foldLeft
). Those intermediate results are then combined by using combop
(like fold
). The implementation of this operation may operate on an arbitrary
number of collection partitions (even 1), so combop
may be invoked an
arbitrary number of times (even 0).
As an example, consider summing up the integer values of a list of chars. The
initial value for the sum is 0. First, seqop
transforms each input character
to an Int and adds it to the sum (of the partition). Then, combop
just needs
to sum up the intermediate results of the partitions:
- B
- the type of accumulated results
- z
- the initial value for the accumulated result of the partition - this will
typically be the neutral element for the
seqop
operator (e.g.Nil
for list concatenation or0
for summation) and may be evaluated more than once
- the initial value for the accumulated result of the partition - this will
typically be the neutral element for the
- seqop
- an operator used to accumulate results within a partition
- combop
- an associative operator used to combine results from different partitions
- Definition Classes
- TraversableOnce → GenTraversableOnce
(defined at scala.collection.TraversableOnce)
def collectFirst[B](pf: PartialFunction[A, B]): Option[B]
Finds the first element of the traversable or iterator 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.
- an option value containing pf applied to the first value for which it is
defined, or
- Definition Classes
- TraversableOnce
Example:
(defined at scala.collection.TraversableOnce)
def copyToArray[B >: A](xs: Array[B]): Unit
[use case]
Copies the elements of this set to an array. Fills the given array xs
with
values of this set. Copying will stop once either the end of the current set is
reached, or the end of the target array is reached.
- xs
- the array to fill.
- Definition Classes
- TraversableOnce → GenTraversableOnce
(defined at scala.collection.TraversableOnce)
def copyToArray[B >: A](xs: Array[B], start: Int): Unit
[use case]
Copies the elements of this set to an array. Fills the given array xs
with
values of this set, beginning at index start
. Copying will stop once either
the end of the current set is reached, or the end of the target array is
reached.
- xs
- the array to fill.
- start
- the starting index.
- Definition Classes
- TraversableOnce → GenTraversableOnce
(defined at scala.collection.TraversableOnce)
def copyToBuffer[B >: A](dest: Buffer[B]): Unit
Copies all elements of this traversable or iterator to a buffer.
Note: will not terminate for infinite-sized collections.
- dest
- The buffer to which elements are copied.
- Definition Classes
- TraversableOnce
(defined at scala.collection.TraversableOnce)
def count(p: (A) ⇒ Boolean): Int
Counts the number of elements in the traversable or iterator which satisfy a predicate.
- p
- the predicate used to test elements.
- returns
- the number of elements satisfying the predicate
p
.
- the number of elements satisfying the predicate
- Definition Classes
- TraversableOnce → GenTraversableOnce
(defined at scala.collection.TraversableOnce)
def foldLeft[B](z: B)(op: (B, A) ⇒ B): B
Applies a binary operator to a start value and all elements of this traversable or iterator, 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 traversable or iterator, going left to right with the start valuez
on the left:
- the result of inserting
where `x1, ..., xn` are the elements of this traversable or iterator.
Returns `z` if this traversable or iterator is empty.
- Definition Classes
- TraversableOnce → GenTraversableOnce
(defined at scala.collection.TraversableOnce)
def fold[A1 >: A](z: A1)(op: (A1, A1) ⇒ A1): A1
Folds the elements of this traversable or iterator using the specified associative binary operator.
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
.
- a type parameter for the binary operator, a supertype of
- 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).
- 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.,
- op
- a binary operator that must be associative.
- returns
- the result of applying the fold operator
op
between all the elements andz
, orz
if this traversable or iterator is empty.
- the result of applying the fold operator
- Definition Classes
- TraversableOnce → GenTraversableOnce
(defined at scala.collection.TraversableOnce)
def maxBy[B](f: (A) ⇒ B)(implicit cmp: Ordering[B]): A
[use case]
Finds the first element which yields the largest value measured by function f.
- B
- The result type of the function f.
- f
- The measuring function.
- returns
- the first element of this set with the largest value measured by function f.
- Definition Classes
- TraversableOnce → GenTraversableOnce
(defined at scala.collection.TraversableOnce)
def minBy[B](f: (A) ⇒ B)(implicit cmp: Ordering[B]): A
[use case]
Finds the first element which yields the smallest value measured by function f.
- B
- The result type of the function f.
- f
- The measuring function.
- returns
- the first element of this set with the smallest value measured by function f.
- Definition Classes
- TraversableOnce → GenTraversableOnce
(defined at scala.collection.TraversableOnce)
def mkString(sep: String): String
Displays all elements of this traversable or iterator in a string using a separator string.
- sep
- the separator string.
- returns
- a string representation of this traversable or iterator. In the resulting
string the string representations (w.r.t. the method
toString
) of all elements of this traversable or iterator are separated by the stringsep
.
- a string representation of this traversable or iterator. In the resulting
string the string representations (w.r.t. the method
- Definition Classes
- TraversableOnce → GenTraversableOnce
Example:
(defined at scala.collection.TraversableOnce)
def mkString(start: String, sep: String, end: String): String
Displays all elements of this traversable or iterator in a string using start, end, and separator strings.
- start
- the starting string.
- sep
- the separator string.
- end
- the ending string.
- returns
- a string representation of this traversable or iterator. The resulting
string begins with the string
start
and ends with the stringend
. Inside, the string representations (w.r.t. the methodtoString
) of all elements of this traversable or iterator are separated by the stringsep
.
- a string representation of this traversable or iterator. The resulting
string begins with the string
- Definition Classes
- TraversableOnce → GenTraversableOnce
Example:
(defined at scala.collection.TraversableOnce)
def reduceLeftOption[B >: A](op: (B, A) ⇒ B): Option[B]
Optionally applies a binary operator to all elements of this traversable or iterator, 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 traversable or iterator is nonempty,None
otherwise.
- an option value containing the result of
- Definition Classes
- TraversableOnce → GenTraversableOnce
(defined at scala.collection.TraversableOnce)
def reduceLeft[B >: A](op: (B, A) ⇒ B): B
Applies a binary operator to all elements of this traversable or iterator, 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 traversable or iterator, going left to right:
- the result of inserting
where `x1, ..., xn` are the elements of this traversable or iterator.
- Definition Classes
- TraversableOnce
- Exceptions thrown
- UnsupportedOperationException if this traversable or iterator is empty.
(defined at scala.collection.TraversableOnce)
def reduceOption[A1 >: A](op: (A1, A1) ⇒ A1): Option[A1]
Reduces the elements of this traversable or iterator, if any, using the specified associative binary operator.
The order in which operations are performed on elements is unspecified and may be nondeterministic.
- A1
- A type parameter for the binary operator, a supertype of
A
.
- A type parameter for the binary operator, a supertype of
- 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, andNone
otherwise.
- An option value containing result of applying reduce operator
- Definition Classes
- TraversableOnce → GenTraversableOnce
(defined at scala.collection.TraversableOnce)
def reduceRightOption[B >: A](op: (A, B) ⇒ B): Option[B]
Optionally applies a binary operator to all elements of this traversable or iterator, 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 traversable or iterator is nonempty,None
otherwise.
- an option value containing the result of
- Definition Classes
- TraversableOnce → GenTraversableOnce
(defined at scala.collection.TraversableOnce)
def reduce[A1 >: A](op: (A1, A1) ⇒ A1): A1
Reduces the elements of this traversable or iterator using the specified associative binary operator.
The order in which operations are performed on elements is unspecified and may be nondeterministic.
- A1
- A type parameter for the binary operator, a supertype of
A
.
- A type parameter for the binary operator, a supertype of
- op
- A binary operator that must be associative.
- returns
- The result of applying reduce operator
op
between all the elements if the traversable or iterator is nonempty.
- The result of applying reduce operator
- Definition Classes
- TraversableOnce → GenTraversableOnce
- Exceptions thrown
- UnsupportedOperationException if this traversable or iterator is empty.
(defined at scala.collection.TraversableOnce)
def toIndexedSeq: immutable.IndexedSeq[A]
Converts this traversable or iterator to an indexed sequence.
Note: will not terminate for infinite-sized collections.
- returns
- an indexed sequence containing all elements of this traversable or iterator.
- Definition Classes
- TraversableOnce → GenTraversableOnce
(defined at scala.collection.TraversableOnce)
def toMap[T, U](implicit ev: <:<[A, (T, U)]): immutable.Map[T, U]
[use case]
Converts this set to a map. This method is unavailable unless the elements are members of Tuple2, each ((T, U)) becoming a key-value pair in the map. Duplicate keys will be overwritten by later keys: if this is an unordered collection, which key is in the resulting map is undefined.
- returns
- a map of type
immutable.Map[T, U]
containing all key/value pairs of type(T, U)
of this set.
- a map of type
- Definition Classes
- TraversableOnce → GenTraversableOnce
(defined at scala.collection.TraversableOnce)
def toSet[B >: A]: immutable.Set[B]
Converts this traversable or iterator to a set.
Note: will not terminate for infinite-sized collections.
- returns
- a set containing all elements of this traversable or iterator.
- Definition Classes
- TraversableOnce → GenTraversableOnce
(defined at scala.collection.TraversableOnce)
Concrete Value Members From scala.collection.generic.GenericSetTemplate
def empty: Set[A]
- Definition Classes
- GenericSetTemplate
(defined at scala.collection.generic.GenericSetTemplate)
Concrete Value Members From scala.collection.generic.GenericTraversableTemplate ——————————————————————————–
def flatten[B](implicit asTraversable: (A) ⇒ GenTraversableOnce[B]): Set[B]
[use case]
Converts this set of traversable collections into a set formed by the elements of these traversable collections.
The resulting collection’s type will be guided by the static type of set. For example:
- B
- the type of the elements of each traversable collection.
- returns
- a new set resulting from concatenating all element sets.
- Definition Classes
- GenericTraversableTemplate
(defined at scala.collection.generic.GenericTraversableTemplate)
def genericBuilder[B]: Builder[B, Set[B]]
The generic builder that builds instances of Traversable at arbitrary element types.
- Definition Classes
- GenericTraversableTemplate
(defined at scala.collection.generic.GenericTraversableTemplate)
def transpose[B](implicit asTraversable: (A) ⇒ GenTraversableOnce[B]): Set[Set[B]]
Transposes this collection of traversable collections into a collection of collections.
The resulting collection’s type will be guided by the static type of collection. For example:
- B
- the type of the elements of each traversable collection.
- asTraversable
- an implicit conversion which asserts that the element type of this
collection is a
Traversable
.
- an implicit conversion which asserts that the element type of this
collection is a
- returns
- a two-dimensional collection of collections which has as n th row the n th column of this collection.
- Definition Classes
- GenericTraversableTemplate
- Annotations
- @migration
- Migration
- (Changed in version 2.9.0)
transpose
throws anIllegalArgumentException
if collections are not uniformly sized.
- (Changed in version 2.9.0)
- Exceptions thrown
- IllegalArgumentException if all collections in this collection are not of the same size.
(defined at scala.collection.generic.GenericTraversableTemplate)
def unzip3[A1, A2, A3](implicit asTriple: (A) ⇒ (A1, A2, A3)): (Set[A1], Set[A2], Set[A3])
Converts this collection of triples into three collections of the first, second, and third element of each triple.
- 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 collection is a triple.
- returns
- a triple of collections, containing the first, second, respectively third member of each element triple of this collection.
- Definition Classes
- GenericTraversableTemplate
(defined at scala.collection.generic.GenericTraversableTemplate)
def unzip[A1, A2](implicit asPair: (A) ⇒ (A1, A2)): (Set[A1], Set[A2])
Converts this collection of pairs into two collections of the first and second half of each pair.
- 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 collection is a pair.
- returns
- a pair of collections, containing the first, respectively second half of each element pair of this collection.
- Definition Classes
- GenericTraversableTemplate
(defined at scala.collection.generic.GenericTraversableTemplate)
Concrete Value Members From scala.collection.generic.Subtractable
def -(elem1: A, elem2: A, elems: A*): Set[A]
Creates a new collection from this collection with some elements removed.
This method takes two or more elements to be removed. Another overloaded variant of this method handles the case where a single element is removed.
- elem1
- the first element to remove.
- elem2
- the second element to remove.
- elems
- the remaining elements to remove.
- returns
- a new collection that contains all elements of the current collection except one less occurrence of each of the given elements.
- Definition Classes
- Subtractable
(defined at scala.collection.generic.Subtractable)
def --(xs: GenTraversableOnce[A]): Set[A]
Creates a new collection from this collection by removing all elements of another collection.
- xs
- the collection containing the removed elements.
- returns
- a new collection that contains all elements of the current collection except
one less occurrence of each of the elements of
elems
.
- a new collection that contains all elements of the current collection except
one less occurrence of each of the elements of
- Definition Classes
- Subtractable
(defined at scala.collection.generic.Subtractable)
Concrete Value Members From Implicit scala.collection.parallel.CollectionsHaveToParArray ——————————————————————————–
def toParArray: ParArray[T]
- Implicit information
- This member is added by an implicit conversion from AbstractSet [A] to CollectionsHaveToParArray [AbstractSet [A], T] performed by method CollectionsHaveToParArray in scala.collection.parallel. This conversion will take place only if an implicit value of type (AbstractSet [A]) ⇒ GenTraversableOnce [T] is in scope.
- Definition Classes
- CollectionsHaveToParArray (added by implicit convertion: scala.collection.parallel.CollectionsHaveToParArray)
Full Source:
Interested in Scala?
I send out weekly, personalized emails with articles and conference talks.
Subscribe now.