Scala Library: scala.collection.mutable.SetProxy
scala.collection.mutable.SetProxy
This is a simple wrapper class for scala.collection.mutable.Set. It is most useful for assembling customized set abstractions dynamically using object composition and forwarding.
- Annotations
- @ deprecated
- Deprecated
- (Since version 2.11.0) Proxying is deprecated due to lack of use and compiler-level support.
- Source
- Version
- 1.1, 09/05/2004
- Since
- 1
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)
Concrete Value Members From scala.Proxy
def equals(that: Any): Boolean
Compares the receiver object ( this
) with the argument object ( that
) for
equivalence.
Any implementation of this method should be an equivalence relation :
- It is reflexive: for any instance
x
of typeAny
,x.equals(x)
should returntrue
. - It is symmetric: for any instances
x
andy
of typeAny
,x.equals(y)
should returntrue
if and only ify.equals(x)
returnstrue
. - It is transitive: for any instances
x
,y
, andz
of typeAny
ifx.equals(y)
returnstrue
andy.equals(z)
returnstrue
, thenx.equals(z)
should returntrue
.
If you override this method, you should verify that your implementation remains
an equivalence relation. Additionally, when overriding this method it is usually
necessary to override hashCode
to ensure that objects which are “equal” (
o1.equals(o2)
returns true
) hash to the same scala.Int. (
o1.hashCode.equals(o2.hashCode)
).
- that
- the object to compare against this object for equality.
- returns
true
if the receiver object is equivalent to the argument;false
otherwise.
- Definition Classes
- Proxy → Any
(defined at scala.Proxy)
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 thisCollection: collection.Iterable[A]
The underlying collection seen as an instance of Iterable
. By default this is
implemented as the current collection object itself, but this can be overridden.
- Attributes
- protected[this]
- Definition Classes
- IterableLike → TraversableLike
(defined at scala.collection.IterableLike)
def toCollection(repr: Set[A]): collection.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)
Concrete Value Members From scala.collection.IterableProxyLike
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
- IterableProxyLike → IterableLike
(defined at scala.collection.IterableProxyLike)
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
- IterableProxyLike → IterableLike
- See also
- scala.collection.Iterator, method
grouped
- scala.collection.Iterator, method
(defined at scala.collection.IterableProxyLike)
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 mutable 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
- IterableProxyLike → IterableLike → GenIterableLike
(defined at scala.collection.IterableProxyLike)
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
- IterableProxyLike → IterableLike
- See also
- scala.collection.Iterator, method
sliding
- scala.collection.Iterator, method
(defined at scala.collection.IterableProxyLike)
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
- IterableProxyLike → IterableLike
- See also
- scala.collection.Iterator, method
sliding
- scala.collection.Iterator, method
(defined at scala.collection.IterableProxyLike)
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
- IterableProxyLike → IterableLike
(defined at scala.collection.IterableProxyLike)
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
- IterableProxyLike → TraversableProxyLike → IterableLike → TraversableLike
(defined at scala.collection.IterableProxyLike)
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
- IterableProxyLike → TraversableProxyLike → IterableLike → TraversableLike
(defined at scala.collection.IterableProxyLike)
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 mutable set formed from this mutable 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 mutable set is shorter
than
that
.
- the element to be used to fill up the result if this mutable set is shorter
than
- thatElem
- the element to be used to fill up the result if
that
is shorter than this mutable set.
- the element to be used to fill up the result if
- returns
- a new mutable set containing pairs consisting of corresponding elements of
this mutable set and
that
. The length of the returned collection is the maximum of the lengths of this mutable set andthat
. If this mutable set is shorter thanthat
,thisElem
values are used to pad the result. Ifthat
is shorter than this mutable set,thatElem
values are used to pad the result.
- a new mutable set containing pairs consisting of corresponding elements of
this mutable set and
- Definition Classes
- IterableProxyLike → IterableLike → GenIterableLike
(defined at scala.collection.IterableProxyLike)
def zipWithIndex[A1 >: A, That](implicit bf: CanBuildFrom[Set[A], (A1, Int), That]): That
[use case]
Zips this mutable set with its indices.
Note: might return different results for different runs, unless the underlying collection type is ordered.
- returns
- A new mutable set containing pairs consisting of all elements of this
mutable set paired with their index. Indices start at
0
.
- A new mutable set containing pairs consisting of all elements of this
mutable set paired with their index. Indices start at
- Definition Classes
- IterableProxyLike → IterableLike → GenIterableLike
Example:
(defined at scala.collection.IterableProxyLike)
def zip[A1 >: A, B, That](that: GenIterable[B])(implicit bf: CanBuildFrom[Set[A], (A1, B), That]): That
[use case]
Returns a mutable set formed from this mutable 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 mutable set containing pairs consisting of corresponding elements of
this mutable set and
that
. The length of the returned collection is the minimum of the lengths of this mutable set andthat
.
- a new mutable set containing pairs consisting of corresponding elements of
this mutable set and
- Definition Classes
- IterableProxyLike → IterableLike → GenIterableLike
(defined at scala.collection.IterableProxyLike)
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.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)
Concrete Value Members From scala.collection.SetProxyLike
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
- SetProxyLike → GenSetLike
(defined at scala.collection.SetProxyLike)
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
- SetProxyLike → GenSetLike
(defined at scala.collection.SetProxyLike)
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
- SetProxyLike → GenSetLike → Function1
(defined at scala.collection.SetProxyLike)
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
- SetProxyLike → SetLike → GenSetLike
(defined at scala.collection.SetProxyLike)
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
- SetProxyLike → SetLike → GenSetLike
(defined at scala.collection.SetProxyLike)
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
- SetProxyLike → GenSetLike
(defined at scala.collection.SetProxyLike)
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
- SetProxyLike → GenSetLike
(defined at scala.collection.SetProxyLike)
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
- SetProxyLike → SetLike → GenSetLike
(defined at scala.collection.SetProxyLike)
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
- SetProxyLike → GenSetLike
(defined at scala.collection.SetProxyLike)
Concrete Value Members From scala.collection.TraversableLike
def ++:[B >: A, That](that: collection.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 mutable set which contains all elements of this mutable set followed
by all elements of
that
.
- a new mutable set which contains all elements of this mutable set followed
by all elements of
- Definition Classes
- TraversableLike
(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 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 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 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 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 mutable 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 mutable set with the smallest value measured by function f.
- Definition Classes
- TraversableOnce → GenTraversableOnce
(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 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)
Abstract Value Members From scala.collection.TraversableProxyLike
abstract def self: Set[A]
- Definition Classes
- TraversableProxyLike → Proxy
(defined at scala.collection.TraversableProxyLike)
Concrete Value Members From scala.collection.TraversableProxyLike
def ++[B >: A, That](xs: GenTraversableOnce[B])(implicit bf: CanBuildFrom[Set[A], B, That]): That
[use case]
Returns a new mutable set containing the elements from the left hand operand followed by the elements from the right hand operand. The element type of the mutable 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 mutable set which contains all elements of this mutable set followed
by all elements of
that
.
- a new mutable set which contains all elements of this mutable set followed
by all elements of
- Definition Classes
- TraversableProxyLike → TraversableLike → GenTraversableLike
(defined at scala.collection.TraversableProxyLike)
def /:[B](z: B)(op: (B, A) ⇒ B): B
Applies a binary operator to a start value and all elements of this traversable collection, 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 collection, going left to right with the start valuez
on the left:
- the result of inserting
where `x1, ..., xn` are the elements of this traversable collection.
- Definition Classes
- TraversableProxyLike → TraversableOnce → GenTraversableOnce
(defined at scala.collection.TraversableProxyLike)
def :\[B](z: B)(op: (A, B) ⇒ B): B
Applies a binary operator to all elements of this traversable collection 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 collection, going right to left with the start valuez
on the right:
- the result of inserting
where `x1, ..., xn` are the elements of this traversable collection.
- Definition Classes
- TraversableProxyLike → TraversableOnce → GenTraversableOnce
(defined at scala.collection.TraversableProxyLike)
def addString(b: StringBuilder): StringBuilder
Appends all elements of this traversable collection to a string builder. The
written text consists of the string representations (w.r.t. the method
toString
) of all elements of this traversable collection 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
- TraversableProxyLike → TraversableOnce
(defined at scala.collection.TraversableProxyLike)
def addString(b: StringBuilder, sep: String): StringBuilder
Appends all elements of this traversable 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 traversable collection,
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
- TraversableProxyLike → TraversableOnce
(defined at scala.collection.TraversableProxyLike)
def addString(b: StringBuilder, start: String, sep: String, end: String): StringBuilder
Appends all elements of this traversable 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 traversable collection
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
- TraversableProxyLike → TraversableOnce
(defined at scala.collection.TraversableProxyLike)
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 mutable set on which the function is defined.
- B
- the element type of the returned collection.
- pf
- the partial function which filters and maps the mutable set.
- returns
- a new mutable 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 mutable set resulting from applying the given partial function
- Definition Classes
- TraversableProxyLike → TraversableLike → GenTraversableLike
(defined at scala.collection.TraversableProxyLike)
def copyToArray[B >: A](xs: Array[B]): Unit
[use case]
Copies the elements of this mutable set to an array. Fills the given array xs
with values of this mutable set. Copying will stop once either the end of the
current mutable set is reached, or the end of the target array is reached.
- xs
- the array to fill.
- Definition Classes
- TraversableProxyLike → TraversableOnce → GenTraversableOnce
(defined at scala.collection.TraversableProxyLike)
def copyToArray[B >: A](xs: Array[B], start: Int): Unit
[use case]
Copies the elements of this mutable set to an array. Fills the given array xs
with values of this mutable set, beginning at index start
. Copying will stop
once either the end of the current mutable set is reached, or the end of the
target array is reached.
- xs
- the array to fill.
- start
- the starting index.
- Definition Classes
- TraversableProxyLike → TraversableOnce → GenTraversableOnce
(defined at scala.collection.TraversableProxyLike)
def copyToArray[B >: A](xs: Array[B], start: Int, len: Int): Unit
[use case]
Copies the elements of this mutable set to an array. Fills the given array xs
with at most len
elements of this mutable set, starting at position start
.
Copying will stop once either the end of the current mutable 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
- TraversableProxyLike → TraversableLike → TraversableOnce → GenTraversableOnce
(defined at scala.collection.TraversableProxyLike)
def copyToBuffer[B >: A](dest: Buffer[B]): Unit
Copies all elements of this traversable collection to a buffer.
Note: will not terminate for infinite-sized collections.
- dest
- The buffer to which elements are copied.
- Definition Classes
- TraversableProxyLike → TraversableOnce
(defined at scala.collection.TraversableProxyLike)
def count(p: (A) ⇒ Boolean): Int
Counts the number of elements in the traversable collection 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
- TraversableProxyLike → TraversableOnce → GenTraversableOnce
(defined at scala.collection.TraversableProxyLike)
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 traversable collection.
- returns
- a traversable collection consisting of all elements of this traversable
collection except the first
n
ones, or else the empty traversable collection, if this traversable collection has less thann
elements.
- a traversable collection consisting of all elements of this traversable
collection except the first
- Definition Classes
- TraversableProxyLike → TraversableLike → GenTraversableLike
(defined at scala.collection.TraversableProxyLike)
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
- TraversableProxyLike → TraversableLike → GenTraversableLike
(defined at scala.collection.TraversableProxyLike)
def exists(p: (A) ⇒ Boolean): Boolean
Tests whether a predicate holds for at least one element of this traversable collection.
Note: may not terminate for infinite-sized collections.
- p
- the predicate used to test elements.
- returns
false
if this traversable collection is empty, otherwisetrue
if the given predicatep
holds for some of the elements of this traversable collection, otherwisefalse
- Definition Classes
- TraversableProxyLike → TraversableLike → TraversableOnce → GenTraversableOnce
(defined at scala.collection.TraversableProxyLike)
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
- TraversableProxyLike → TraversableLike → GenTraversableLike
(defined at scala.collection.TraversableProxyLike)
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
- TraversableProxyLike → TraversableLike → GenTraversableLike
(defined at scala.collection.TraversableProxyLike)
def find(p: (A) ⇒ Boolean): Option[A]
Finds the first element of the traversable 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 traversable collection
that satisfies
p
, orNone
if none exists.
- an option value containing the first element in the traversable collection
that satisfies
- Definition Classes
- TraversableProxyLike → TraversableLike → TraversableOnce → GenTraversableOnce
(defined at scala.collection.TraversableProxyLike)
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 mutable set and using the elements of the resulting collections.
For example:
The type of the resulting collection is guided by the static type of mutable 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 mutable set resulting from applying the given collection-valued
function
f
to each element of this mutable set and concatenating the results.
- a new mutable set resulting from applying the given collection-valued
function
- Definition Classes
- TraversableProxyLike → TraversableLike → GenTraversableLike → FilterMonadic
(defined at scala.collection.TraversableProxyLike)
def foldLeft[B](z: B)(op: (B, A) ⇒ B): B
Applies a binary operator to a start value and all elements of this traversable collection, going left to right.
Note: will not terminate for infinite-sized collections.
Note: might return different results for different runs, unless the underlying collection type is ordered. or the operator is associative and commutative.
- B
- the result type of the binary operator.
- z
- the start value.
- op
- the binary operator.
- returns
- the result of inserting
op
between consecutive elements of this traversable collection, going left to right with the start valuez
on the left:
- the result of inserting
where `x1, ..., xn` are the elements of this traversable collection. Returns
`z` if this traversable collection is empty.
- Definition Classes
- TraversableProxyLike → TraversableOnce → GenTraversableOnce
(defined at scala.collection.TraversableProxyLike)
def foldRight[B](z: B)(op: (A, B) ⇒ B): B
Applies a binary operator to all elements of this traversable 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 traversable collection, going right to left with the start valuez
on the right:
- the result of inserting
where `x1, ..., xn` are the elements of this traversable collection. Returns
`z` if this traversable collection is empty.
- Definition Classes
- TraversableProxyLike → TraversableOnce → GenTraversableOnce
(defined at scala.collection.TraversableProxyLike)
def forall(p: (A) ⇒ Boolean): Boolean
Tests whether a predicate holds for all elements of this traversable collection.
Note: may not terminate for infinite-sized collections.
- p
- the predicate used to test elements.
- returns
true
if this traversable collection is empty or the given predicatep
holds for all elements of this traversable collection, otherwisefalse
.
- Definition Classes
- TraversableProxyLike → TraversableLike → TraversableOnce → GenTraversableOnce
(defined at scala.collection.TraversableProxyLike)
def foreach[U](f: (A) ⇒ U): Unit
[use case]
Applies a function f
to all elements of this mutable set.
Note: this method underlies the implementation of most other bulk operations. It’s important to implement this method in an efficient way.
- 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
- TraversableProxyLike → TraversableLike → GenTraversableLike → TraversableOnce → GenTraversableOnce → FilterMonadic
(defined at scala.collection.TraversableProxyLike)
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
- TraversableProxyLike → TraversableLike → GenTraversableLike
(defined at scala.collection.TraversableProxyLike)
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
- TraversableProxyLike → TraversableLike → GenTraversableLike
- Exceptions thrown
- UnsupportedOperationException if the traversable collection is empty.
(defined at scala.collection.TraversableProxyLike)
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 mutable set.
- B
- the element type of the returned collection.
- f
- the function to apply to each element.
- returns
- a new mutable set resulting from applying the given function
f
to each element of this mutable set and collecting the results.
- a new mutable set resulting from applying the given function
- Definition Classes
- TraversableProxyLike → TraversableLike → GenTraversableLike → FilterMonadic
(defined at scala.collection.TraversableProxyLike)
def mkString(sep: String): String
Displays all elements of this traversable collection in a string using a separator string.
- sep
- the separator string.
- returns
- a string representation of this traversable collection. In the resulting
string the string representations (w.r.t. the method
toString
) of all elements of this traversable collection are separated by the stringsep
.
- a string representation of this traversable collection. In the resulting
string the string representations (w.r.t. the method
- Definition Classes
- TraversableProxyLike → TraversableOnce → GenTraversableOnce
Example:
(defined at scala.collection.TraversableProxyLike)
def mkString(start: String, sep: String, end: String): String
Displays all elements of this traversable collection 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 collection. 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 collection are separated by the stringsep
.
- a string representation of this traversable collection. The resulting string
begins with the string
- Definition Classes
- TraversableProxyLike → TraversableOnce → GenTraversableOnce
Example:
(defined at scala.collection.TraversableProxyLike)
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
- TraversableProxyLike → TraversableLike → GenTraversableLike
(defined at scala.collection.TraversableProxyLike)
def reduceLeftOption[B >: A](op: (B, A) ⇒ B): Option[B]
Optionally applies a binary operator to all elements of this traversable collection, going left to right.
Note: will not terminate for infinite-sized collections.
Note: might return different results for different runs, unless the underlying collection type is ordered. or the operator is associative and commutative.
- B
- the result type of the binary operator.
- op
- the binary operator.
- returns
- an option value containing the result of
reduceLeft(op)
if this traversable collection is nonempty,None
otherwise.
- an option value containing the result of
- Definition Classes
- TraversableProxyLike → TraversableOnce → GenTraversableOnce
(defined at scala.collection.TraversableProxyLike)
def reduceLeft[B >: A](op: (B, A) ⇒ B): B
Applies a binary operator to all elements of this traversable collection, going left to right.
Note: will not terminate for infinite-sized collections.
Note: might return different results for different runs, unless the underlying collection type is ordered. or the operator is associative and commutative.
- B
- the result type of the binary operator.
- op
- the binary operator.
- returns
- the result of inserting
op
between consecutive elements of this traversable collection, going left to right:
- the result of inserting
where `x1, ..., xn` are the elements of this traversable collection.
- Definition Classes
- TraversableProxyLike → TraversableOnce
- Exceptions thrown
- UnsupportedOperationException if this traversable collection is empty.
(defined at scala.collection.TraversableProxyLike)
def reduceRightOption[B >: A](op: (A, B) ⇒ B): Option[B]
Optionally applies a binary operator to all elements of this traversable collection, going right to left.
Note: will not terminate for infinite-sized collections.
Note: might return different results for different runs, unless the underlying collection type is ordered. or the operator is associative and commutative.
- B
- the result type of the binary operator.
- op
- the binary operator.
- returns
- an option value containing the result of
reduceRight(op)
if this traversable collection is nonempty,None
otherwise.
- an option value containing the result of
- Definition Classes
- TraversableProxyLike → TraversableOnce → GenTraversableOnce
(defined at scala.collection.TraversableProxyLike)
def reduceRight[B >: A](op: (A, B) ⇒ B): B
Applies a binary operator to all elements of this traversable 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 traversable collection, going right to left:
- the result of inserting
where `x1, ..., xn` are the elements of this traversable collection.
- Definition Classes
- TraversableProxyLike → TraversableOnce → GenTraversableOnce
- Exceptions thrown
- UnsupportedOperationException if this traversable collection is empty.
(defined at scala.collection.TraversableProxyLike)
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
- TraversableProxyLike → TraversableLike → GenTraversableLike
(defined at scala.collection.TraversableProxyLike)
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
- TraversableProxyLike → TraversableLike → GenTraversableLike
(defined at scala.collection.TraversableProxyLike)
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 traversable collection containing the elements greater than or equal to
index
from
extending up to (but not including) indexuntil
of this traversable collection.
- a traversable collection containing the elements greater than or equal to
index
- Definition Classes
- TraversableProxyLike → TraversableLike → GenTraversableLike
(defined at scala.collection.TraversableProxyLike)
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
- TraversableProxyLike → TraversableLike → GenTraversableLike
(defined at scala.collection.TraversableProxyLike)
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
- TraversableProxyLike → TraversableLike → GenTraversableLike
(defined at scala.collection.TraversableProxyLike)
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
- TraversableProxyLike → TraversableLike → GenTraversableLike
- Exceptions thrown
UnsupportedOperationException
if the traversable collection is empty.
(defined at scala.collection.TraversableProxyLike)
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 traversable collection.
- returns
- a traversable collection consisting only of the first
n
elements of this traversable collection, or else the whole traversable collection, if it has less thann
elements.
- a traversable collection consisting only of the first
- Definition Classes
- TraversableProxyLike → TraversableLike → GenTraversableLike
(defined at scala.collection.TraversableProxyLike)
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 traversable collection whose elements all satisfy
the predicate
p
.
- the longest prefix of this traversable collection whose elements all satisfy
the predicate
- Definition Classes
- TraversableProxyLike → TraversableLike → GenTraversableLike
(defined at scala.collection.TraversableProxyLike)
def toBuffer[B >: A]: Buffer[B]
Uses the contents of this traversable collection to create a new mutable buffer.
Note: will not terminate for infinite-sized collections.
- returns
- a buffer containing all elements of this traversable collection.
- Definition Classes
- TraversableProxyLike → TraversableOnce → GenTraversableOnce
(defined at scala.collection.TraversableProxyLike)
def toIndexedSeq: immutable.IndexedSeq[A]
Converts this traversable collection to an indexed sequence.
Note: will not terminate for infinite-sized collections.
- returns
- an indexed sequence containing all elements of this traversable collection.
- Definition Classes
- TraversableProxyLike → TraversableOnce → GenTraversableOnce
(defined at scala.collection.TraversableProxyLike)
def toIterable: collection.Iterable[A]
Converts this traversable collection to an iterable collection. Note that the
choice of target Iterable
is lazy in this default implementation as this
TraversableOnce
may be lazy and unevaluated (i.e. it may be an iterator which
is only traversable once).
Note: will not terminate for infinite-sized collections.
- returns
- an
Iterable
containing all elements of this traversable collection.
- an
- Definition Classes
- TraversableProxyLike → TraversableOnce → GenTraversableOnce
(defined at scala.collection.TraversableProxyLike)
def toMap[T, U](implicit ev: <:<[A, (T, U)]): immutable.Map[T, U]
[use case]
Converts this mutable 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 mutable set.
- a map of type
- Definition Classes
- TraversableProxyLike → TraversableOnce → GenTraversableOnce
(defined at scala.collection.TraversableProxyLike)
def toSeq: collection.Seq[A]
Converts this traversable collection to a sequence. As with toIterable
, it’s
lazy in this default implementation, as this TraversableOnce
may be lazy and
unevaluated.
Note: will not terminate for infinite-sized collections.
- returns
- a sequence containing all elements of this traversable collection.
- Definition Classes
- TraversableProxyLike → TraversableOnce → GenTraversableOnce
(defined at scala.collection.TraversableProxyLike)
def toSet[B >: A]: immutable.Set[B]
Converts this traversable collection to a set.
Note: will not terminate for infinite-sized collections.
- returns
- a set containing all elements of this traversable collection.
- Definition Classes
- TraversableProxyLike → TraversableOnce → GenTraversableOnce
(defined at scala.collection.TraversableProxyLike)
def toTraversable: collection.Traversable[A]
Converts this traversable collection to an unspecified Traversable. Will return the same collection if this instance is already Traversable.
Note: will not terminate for infinite-sized collections.
- returns
- a Traversable containing all elements of this traversable collection.
- Definition Classes
- TraversableProxyLike → TraversableLike → TraversableOnce → GenTraversableOnce
(defined at scala.collection.TraversableProxyLike)
Concrete Value Members From scala.collection.generic.GenericTraversableTemplate ——————————————————————————–
def flatten[B](implicit asTraversable: (A) ⇒ GenTraversableOnce[B]): Set[B]
[use case]
Converts this mutable set of traversable collections into a mutable set formed by the elements of these traversable collections.
The resulting collection’s type will be guided by the static type of mutable set. For example:
- B
- the type of the elements of each traversable collection.
- returns
- a new mutable set resulting from concatenating all element mutable 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.Growable
def ++=(xs: TraversableOnce[A]): SetProxy.this.type
adds all elements produced by a TraversableOnce to this growable collection.
- xs
- the TraversableOnce producing the elements to add.
- returns
- the growable collection itself.
- Definition Classes
- Growable
(defined at scala.collection.generic.Growable)
def +=(elem1: A, elem2: A, elems: A*): SetProxy.this.type
adds two or more elements to this growable collection.
- elem1
- the first element to add.
- elem2
- the second element to add.
- elems
- the remaining elements to add.
- returns
- the growable collection itself
- Definition Classes
- Growable
(defined at scala.collection.generic.Growable)
Concrete Value Members From scala.collection.generic.Shrinkable
def --=(xs: TraversableOnce[A]): SetProxy.this.type
Removes all elements produced by an iterator from this shrinkable collection.
- xs
- the iterator producing the elements to remove.
- returns
- the shrinkable collection itself
- Definition Classes
- Shrinkable
(defined at scala.collection.generic.Shrinkable)
def -=(elem1: A, elem2: A, elems: A*): SetProxy.this.type
Removes two or more elements from this shrinkable collection.
- elem1
- the first element to remove.
- elem2
- the second element to remove.
- elems
- the remaining elements to remove.
- returns
- the shrinkable collection itself
- Definition Classes
- Shrinkable
(defined at scala.collection.generic.Shrinkable)
Concrete Value Members From scala.collection.mutable.Builder
def mapResult[NewTo](f: (Set[A]) ⇒ NewTo): Builder[A, NewTo]
Creates a new builder by applying a transformation function to the results of this builder.
- NewTo
- the type of collection returned by
f
.
- the type of collection returned by
- f
- the transformation function.
- returns
- a new builder which is the same as the current builder except that a transformation function is applied to this builder’s result.
- Definition Classes
- Builder
- Note
- The original builder should no longer be used after
mapResult
is called.
- The original builder should no longer be used after
(defined at scala.collection.mutable.Builder)
def sizeHint(size: Int): Unit
Gives a hint how many elements are expected to be added when the next result
is called. Some builder classes will optimize their representation based on the
hint. However, builder implementations are still required to work correctly even
if the hint is wrong, i.e. a different number of elements is added.
- size
- the hint how many elements will be added.
- Definition Classes
- Builder
(defined at scala.collection.mutable.Builder)
def sizeHint(coll: TraversableLike[_, _]): 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 is known to have a cheap size
method. Currently this is assumed to
be the case if and only if the collection is of type IndexedSeqLike
. Some
builder classes will optimize their representation based on the hint. However,
builder implementations are still required to work correctly even if the hint is
wrong, i.e. a different number of elements is added.
- coll
- the collection which serves as a hint for the result’s size.
- Definition Classes
- Builder
(defined at scala.collection.mutable.Builder)
def sizeHint(coll: TraversableLike[_, _], 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 is known to have a cheap size
method. Currently this is assumed to
be the case if and only if the collection is of type IndexedSeqLike
. Some
builder classes will optimize their representation based on the hint. However,
builder implementations are still required to work correctly even if the hint is
wrong, i.e. a different number of elements is added.
- coll
- the collection which serves as a hint for the result’s size.
- delta
- a correction to add to the
coll.size
to produce the size hint.
- a correction to add to the
- Definition Classes
- Builder
(defined at scala.collection.mutable.Builder)
def sizeHintBounded(size: Int, boundingColl: TraversableLike[_, _]): 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.
- size
- the hint how many elements will be added.
- boundingColl
- the bounding collection. If it is an IndexedSeqLike, then sizes larger than collection’s size are reduced.
- Definition Classes
- Builder
(defined at scala.collection.mutable.Builder)
Concrete Value Members From scala.collection.mutable.Set
def companion: GenericCompanion[Set]
The factory companion object that builds instances of class mutable.Set
. (or
its Iterable
superclass where class mutable.Set
is not a Seq
.)
- Definition Classes
- Set → Set → GenSet → Iterable → Iterable → GenIterable → Traversable → Traversable → GenTraversable → GenericTraversableTemplate
(defined at scala.collection.mutable.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 → Set → GenSet → GenSetLike → Iterable → Iterable → GenIterable → Traversable → Traversable → GenTraversable → Parallelizable → TraversableOnce → GenTraversableOnce
(defined at scala.collection.mutable.Set)
Concrete Value Members From scala.collection.mutable.SetLike
def +(elem1: A, elem2: A, elems: A*): Set[A]
Creates a new set consisting of all the elements of this set and two or more specified elements.
Note that duplicates (elements for which equals
yields true) will be removed,
but it is not specified whether it will be an element of this set or a newly
added element.
- elem1
- the first element to add.
- elem2
- the second element to add.
- elems
- the remaining elements to add.
- returns
- a new set consisting of all the elements of this set,
elem1
,elem2
and those inelems
.
- a new set consisting of all the elements of this set,
- Definition Classes
- SetLike → SetLike
- Annotations
- @migration
- Migration
- (Changed in version 2.8.0)
+
creates a new set. Use+=
to add an element to this set and return that set itself.
- (Changed in version 2.8.0)
(defined at scala.collection.mutable.SetLike)
def ++(xs: GenTraversableOnce[A]): Set[A]
Creates a new set consisting of all the elements of this set and those provided by the specified traversable object.
Note that duplicates (elements for which equals
yields true) will be removed,
but it is not specified whether it will be an element of this set or a newly
added element.
- xs
- the traversable object.
- returns
- a new set consisting of elements of this set and those in
xs
.
- a new set consisting of elements of this set and those in
- Definition Classes
- SetLike → SetLike
- Annotations
- @migration
- Migration
- (Changed in version 2.8.0)
++
creates a new set. Use++=
to add elements to this set and return that set itself.
- (Changed in version 2.8.0)
(defined at scala.collection.mutable.SetLike)
def -(elem1: A, elem2: A, elems: A*): Set[A]
Creates a new set consisting of all the elements of this set except the two or more specified elements.
- elem1
- the first element to remove.
- elem2
- the second element to remove.
- elems
- the remaining elements to remove.
- returns
- a new set consisting of all the elements of this set except
elem1
,elem2
andelems
.
- a new set consisting of all the elements of this set except
- Definition Classes
- SetLike → Subtractable
- Annotations
- @migration
- Migration
- (Changed in version 2.8.0)
-
creates a new set. Use-=
to remove an element from this set and return that set itself.
- (Changed in version 2.8.0)
(defined at scala.collection.mutable.SetLike)
def --(xs: GenTraversableOnce[A]): Set[A]
Creates a new set consisting of all the elements of this set except those provided by the specified traversable object.
- xs
- the traversable object.
- returns
- a new set consisting of all the elements of this set except elements from
xs
.
- a new set consisting of all the elements of this set except elements from
- Definition Classes
- SetLike → Subtractable
- Annotations
- @migration
- Migration
- (Changed in version 2.8.0)
--
creates a new set. Use--=
to remove elements from this set and return that set itself.
- (Changed in version 2.8.0)
(defined at scala.collection.mutable.SetLike)
def add(elem: A): Boolean
Adds an element to this mutable set.
- elem
- the element to be added
- returns
true
if the element was not yet present in the set,false
otherwise.
- Definition Classes
- SetLike
(defined at scala.collection.mutable.SetLike)
def clone(): Set[A]
Create a copy of the receiver object.
The default implementation of the clone
method is platform dependent.
- returns
- a copy of the receiver object.
- Definition Classes
- SetLike → Cloneable → AnyRef
- Note
- not specified by SLS as a member of AnyRef
(defined at scala.collection.mutable.SetLike)
def newBuilder: Builder[A, Set[A]]
A common implementation of newBuilder
for all mutable sets in terms of
empty
. Overrides the implementation in collection.SetLike
for better
efficiency.
- Attributes
- protected[this]
- Definition Classes
- SetLike → SetLike → TraversableLike → HasNewBuilder
(defined at scala.collection.mutable.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 → SetLike → TraversableLike → Parallelizable
(defined at scala.collection.mutable.SetLike)
def remove(elem: A): Boolean
Removes an element from this set.
- elem
- The element to be removed.
- returns
true
if the element was previously present in the set,false
otherwise.
- Definition Classes
- SetLike
(defined at scala.collection.mutable.SetLike)
def result(): Set[A]
The result when this set is used as a builder
- returns
- the set representation itself.
- Definition Classes
- SetLike → Builder
(defined at scala.collection.mutable.SetLike)
def retain(p: (A) ⇒ Boolean): Unit
Removes all elements from the set for which do not satisfy a predicate.
- p
- the predicate used to test elements. Only elements for which
p
returnstrue
are retained in the set; all others are removed.
- the predicate used to test elements. Only elements for which
- Definition Classes
- SetLike
(defined at scala.collection.mutable.SetLike)
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:
- elem
- the element to be added or removed
- included
- a flag indicating whether element should be included or excluded.
- Definition Classes
- SetLike
(defined at scala.collection.mutable.SetLike)
Deprecated Value Members From scala.collection.mutable.SetLike
def <<(cmd: Message[A]): Unit
Send a message to this scriptable object.
- cmd
- the message to send.
- Definition Classes
- SetLike → Scriptable
- Annotations
- @ deprecated
- Deprecated
- (Since version 2.11.0) Scripting is deprecated.
- Exceptions thrown
- UnsupportedOperationException if the message was not understood.
(defined at scala.collection.mutable.SetLike)
Concrete Value Members From scala.collection.mutable.SetProxy
def +(elem: A): SetProxy[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
- SetProxy → SetProxyLike → SetLike → SetLike → GenSetLike
(defined at scala.collection.mutable.SetProxy)
def +=(elem: A): SetProxy.this.type
Adds a single element to the set.
- elem
- the element to be added.
- returns
- the builder itself.
- Definition Classes
- SetProxy → SetLike → Builder → Growable
(defined at scala.collection.mutable.SetProxy)
def -(elem: A): SetProxy[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
- SetProxy → SetProxyLike → SetLike → SetLike → Subtractable → GenSetLike
(defined at scala.collection.mutable.SetProxy)
def -=(elem: A): SetProxy.this.type
Removes a single element from this mutable set.
- elem
- the element to remove.
- returns
- the mutable set itself
- Definition Classes
- SetProxy → SetLike → Shrinkable
(defined at scala.collection.mutable.SetProxy)
def empty: SetProxy[A] { val self: scala.collection.mutable.Set[A] }
The empty set of the same type as this set
- returns
- an empty set of type
This
.
- an empty set of type
- Definition Classes
- SetProxy → SetProxyLike → SetLike → GenericSetTemplate
(defined at scala.collection.mutable.SetProxy)
def repr: SetProxy[A]
The representation object of type Repr
which contains the collection’s
elements
- Definition Classes
- SetProxy → Subtractable → TraversableLike → GenTraversableLike
(defined at scala.collection.mutable.SetProxy)
Concrete Value Members From Implicit scala.collection.parallel.CollectionsHaveToParArray ——————————————————————————–
def toParArray: ParArray[T]
- Implicit information
- This member is added by an implicit conversion from SetProxy [A] to CollectionsHaveToParArray [SetProxy [A], T] performed by method CollectionsHaveToParArray in scala.collection.parallel. This conversion will take place only if an implicit value of type (SetProxy [A]) ⇒ GenTraversableOnce [T] is in scope.
- Definition Classes
- CollectionsHaveToParArray (added by implicit convertion: scala.collection.parallel.CollectionsHaveToParArray)
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