trait SetProxyLike[A, +This <: SetLike[A, This] with Set[A]] extends SetLike[A, This] with IterableProxyLike[A, This]
This trait implements a proxy for sets. It forwards all calls to a different set.
- Annotations
- @deprecated
- Deprecated
(Since version 2.11.0) proxying is deprecated due to lack of use and compiler-level support
- Source
- SetProxyLike.scala
- Since
2.8
- Alphabetic
- By Inheritance
- SetProxyLike
- IterableProxyLike
- TraversableProxyLike
- Proxy
- SetLike
- Subtractable
- GenSetLike
- Function1
- IterableLike
- GenIterableLike
- TraversableLike
- GenTraversableLike
- Parallelizable
- TraversableOnce
- GenTraversableOnce
- FilterMonadic
- HasNewBuilder
- Equals
- AnyRef
- Any
- by CollectionsHaveToParArray
- by MonadOps
- by any2stringadd
- by StringFormat
- by Ensuring
- by ArrowAssoc
- by alternateImplicit
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- Public
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Type Members
-
type
Self = This
The type implementing this traversable
The type implementing this traversable
- Attributes
- protected[this]
- Definition Classes
- TraversableLike
-
class
WithFilter extends FilterMonadic[A, Repr]
A class supporting filtered operations.
A class supporting filtered operations. Instances of this class are returned by method
withFilter
.- Definition Classes
- TraversableLike
Abstract Value Members
-
abstract
def
empty: This
The empty set of the same type as this set
The empty set of the same type as this set
- returns
an empty set of type
This
.
- Definition Classes
- SetProxyLike → SetLike
-
abstract
def
self: This
- Definition Classes
- TraversableProxyLike → Proxy
-
abstract
def
seq: Set[A]
- Definition Classes
- GenSetLike → Parallelizable → GenTraversableOnce
Concrete Value Members
-
final
def
!=(arg0: Any): Boolean
Test two objects for inequality.
Test two objects for inequality.
- returns
true
if !(this == that), false otherwise.
- Definition Classes
- AnyRef → Any
-
final
def
##(): Int
Equivalent to
x.hashCode
except for boxed numeric types andnull
.Equivalent to
x.hashCode
except for boxed numeric types andnull
. For numerics, it returns a hash value which is consistent with value equality: if two value type instances compare as true, then ## will produce the same hash value for each of them. Fornull
returns a hashcode wherenull.hashCode
throws aNullPointerException
.- returns
a hash value consistent with ==
- Definition Classes
- AnyRef → Any
-
def
&(that: GenSet[A]): This
Computes the intersection between this set and another set.
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
.
- Definition Classes
- SetProxyLike → GenSetLike
-
def
&~(that: GenSet[A]): This
The difference of this set and another set.
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
.
- Definition Classes
- SetProxyLike → GenSetLike
-
def
+(elem: A): This
Creates a new set with an additional element, unless the element is already present.
Creates a new set with an additional element, unless the element is already present.
- elem
the element to be added
- returns
a new set that contains all elements of this set and that also contains
elem
.
- Definition Classes
- SetProxyLike → SetLike → GenSetLike
-
def
+(elem1: A, elem2: A, elems: A*): This
Creates a new set with additional elements, omitting duplicates.
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:
scala> val a = Set(1, 3) + 2 + 3 a: scala.collection.immutable.Set[Int] = Set(1, 3, 2)
- 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
-
def
++[B >: A, That](xs: GenTraversableOnce[B])(implicit bf: CanBuildFrom[This, B, That]): That
Returns a new traversable collection containing the elements from the left hand operand followed by the elements from the right hand operand.
Returns a new traversable collection containing the elements from the left hand operand followed by the elements from the right hand operand. The element type of the traversable collection is the most specific superclass encompassing the element types of the two operands.
- 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.- bf
an implicit value of class
CanBuildFrom
which determines the result classThat
from the current representation typeRepr
and the new element typeB
.- returns
a new collection of type
That
which contains all elements of this traversable collection followed by all elements ofthat
.
- Definition Classes
- TraversableProxyLike → TraversableLike → GenTraversableLike
-
def
++(elems: GenTraversableOnce[A]): This
Creates a new set by adding all elements contained in another collection to this set, omitting duplicates.
Creates a new set by adding all elements contained in another collection to this set, omitting duplicates.
This method takes a collection of elements and adds all elements, omitting duplicates, into set.
Example:
scala> val a = Set(1, 2) ++ Set(2, "a") a: scala.collection.immutable.Set[Any] = Set(1, 2, a)
- elems
the collection containing the elements to add.
- returns
a new set with the given elements added, omitting duplicates.
- Definition Classes
- SetLike
-
def
++:[B >: A, That](that: Traversable[B])(implicit bf: CanBuildFrom[This, B, That]): That
As with
++
, returns a new collection containing the elements from the left operand followed by the elements from the right operand.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:
scala> val x = List(1) x: List[Int] = List(1) scala> val y = LinkedList(2) y: scala.collection.mutable.LinkedList[Int] = LinkedList(2) scala> val z = x ++: y z: scala.collection.mutable.LinkedList[Int] = LinkedList(1, 2)
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, butTraversable
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.- that
the traversable to append.
- bf
an implicit value of class
CanBuildFrom
which determines the result classThat
from the current representation typeRepr
and the new element typeB
.- returns
a new collection of type
That
which contains all elements of this traversable collection followed by all elements ofthat
.
- Definition Classes
- TraversableLike
-
def
++:[B](that: TraversableOnce[B]): Set[B]
[use case] As with
++
, returns a new collection containing the elements from the left operand followed by the elements from the right operand.[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:
scala> val x = List(1) x: List[Int] = List(1) scala> val y = LinkedList(2) y: scala.collection.mutable.LinkedList[Int] = LinkedList(2) scala> val z = x ++: y z: scala.collection.mutable.LinkedList[Int] = LinkedList(1, 2)
- 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
.
- Definition Classes
- TraversableLike
Full Signaturedef ++:[B >: A, That](that: TraversableOnce[B])(implicit bf: CanBuildFrom[This, B, That]): That
-
def
-(elem: A): This
Creates a new set with a given element removed from this set.
Creates a new set with a given element removed from this set.
- elem
the element to be removed
- returns
a new set that contains all elements of this set but that does not contain
elem
.
- Definition Classes
- SetProxyLike → SetLike → Subtractable → GenSetLike
-
def
-(elem1: A, elem2: A, elems: A*): This
Creates a new collection from this collection with some elements removed.
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
-
def
--(xs: GenTraversableOnce[A]): This
Creates a new collection from this collection by removing all elements of another collection.
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
.
- Definition Classes
- Subtractable
-
def
->[B](y: B): (SetProxyLike[A, This], B)
- Implicit
- This member is added by an implicit conversion from SetProxyLike[A, This] to ArrowAssoc[SetProxyLike[A, This]] performed by method ArrowAssoc in scala.Predef.
- Definition Classes
- ArrowAssoc
- Annotations
- @inline()
-
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.
Applies a binary operator to a start value and all elements of this traversable collection, going left to right.
Note:
/:
is alternate syntax forfoldLeft
;z /: xs
is the same asxs foldLeft z
.Examples:
Note that the folding function used to compute b is equivalent to that used to compute c.
scala> val a = List(1,2,3,4) a: List[Int] = List(1, 2, 3, 4) scala> val b = (5 /: a)(_+_) b: Int = 15 scala> val c = (5 /: a)((x,y) => x + y) c: Int = 15
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:op(...op(op(z, x_1), x_2), ..., x_n)
where
x1, ..., xn
are the elements of this traversable collection.
- Definition Classes
- TraversableProxyLike → TraversableOnce → GenTraversableOnce
-
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.
Applies a binary operator to all elements of this traversable collection and a start value, going right to left.
Note:
:\
is alternate syntax forfoldRight
;xs :\ z
is the same asxs 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.
scala> val a = List(1,2,3,4) a: List[Int] = List(1, 2, 3, 4) scala> val b = (a :\ 5)(_+_) b: Int = 15 scala> val c = (a :\ 5)((x,y) => x + y) c: Int = 15
- 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:op(x_1, op(x_2, ... op(x_n, z)...))
where
x1, ..., xn
are the elements of this traversable collection.
- Definition Classes
- TraversableProxyLike → TraversableOnce → GenTraversableOnce
-
final
def
==(arg0: Any): Boolean
The expression
x == that
is equivalent toif (x eq null) that eq null else x.equals(that)
.The expression
x == that
is equivalent toif (x eq null) that eq null else x.equals(that)
.- returns
true
if the receiver object is equivalent to the argument;false
otherwise.
- Definition Classes
- AnyRef → Any
-
def
addString(b: mutable.StringBuilder): mutable.StringBuilder
Appends all elements of this traversable collection to a string builder.
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:
scala> val a = List(1,2,3,4) a: List[Int] = List(1, 2, 3, 4) scala> val b = new StringBuilder() b: StringBuilder = scala> val h = a.addString(b) h: StringBuilder = 1234
- b
the string builder to which elements are appended.
- returns
the string builder
b
to which elements were appended.
- Definition Classes
- TraversableProxyLike → TraversableOnce
-
def
addString(b: mutable.StringBuilder, sep: String): mutable.StringBuilder
Appends all elements of this traversable collection to a string builder using a separator string.
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 stringsep
.Example:
scala> val a = List(1,2,3,4) a: List[Int] = List(1, 2, 3, 4) scala> val b = new StringBuilder() b: StringBuilder = scala> a.addString(b, ", ") res0: StringBuilder = 1, 2, 3, 4
- b
the string builder to which elements are appended.
- sep
the separator string.
- returns
the string builder
b
to which elements were appended.
- Definition Classes
- TraversableProxyLike → TraversableOnce
-
def
addString(b: mutable.StringBuilder, start: String, sep: String, end: String): mutable.StringBuilder
Appends all elements of this traversable collection to a string builder using start, end, and separator strings.
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 stringend
. Inside, the string representations (w.r.t. the methodtoString
) of all elements of this traversable collection are separated by the stringsep
.Example:
scala> val a = List(1,2,3,4) a: List[Int] = List(1, 2, 3, 4) scala> val b = new StringBuilder() b: StringBuilder = scala> a.addString(b , "List(" , ", " , ")") res5: StringBuilder = List(1, 2, 3, 4)
- b
the string builder to which elements are appended.
- start
the starting string.
- sep
the separator string.
- end
the ending string.
- returns
the string builder
b
to which elements were appended.
- Definition Classes
- TraversableProxyLike → 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.
Aggregates the results of applying an operator to subsequent elements.
This is a more general form of
fold
andreduce
. It is similar tofoldLeft
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 applyingseqop
, starting withz
(likefoldLeft
). Those intermediate results are then combined by usingcombop
(likefold
). The implementation of this operation may operate on an arbitrary number of collection partitions (even 1), socombop
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:List('a', 'b', 'c').aggregate(0)({ (sum, ch) => sum + ch.toInt }, { (p1, p2) => p1 + p2 })
- 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- 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
-
def
andThen[A](g: (Boolean) ⇒ A): (A) ⇒ A
Composes two instances of Function1 in a new Function1, with this function applied first.
Composes two instances of Function1 in a new Function1, with this function applied first.
- A
the result type of function
g
- g
a function R => A
- returns
a new function
f
such thatf(x) == g(apply(x))
- Definition Classes
- Function1
- Annotations
- @unspecialized()
-
def
apply(elem: A): Boolean
Tests if some element is contained in this set.
Tests if some element is contained in this set.
This method is equivalent to
contains
. It allows sets to be interpreted as predicates.- elem
the element to test for membership.
- returns
true
ifelem
is contained in this set,false
otherwise.
- Definition Classes
- SetProxyLike → GenSetLike → Function1
-
final
def
asInstanceOf[T0]: T0
Cast the receiver object to be of type
T0
.Cast the receiver object to be of type
T0
.Note that the success of a cast at runtime is modulo Scala's erasure semantics. Therefore the expression
1.asInstanceOf[String]
will throw aClassCastException
at runtime, while the expressionList(1).asInstanceOf[List[String]]
will not. In the latter example, because the type argument is erased as part of compilation it is not possible to check whether the contents of the list are of the requested type.- returns
the receiver object.
- Definition Classes
- Any
- Exceptions thrown
ClassCastException
if the receiver object is not an instance of the erasure of typeT0
.
-
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.
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
-
def
clone(): AnyRef
Create a copy of the receiver object.
-
def
collect[B](pf: PartialFunction[A, B]): Set[B]
[use case] Builds a new collection by applying a partial function to all elements of this set on which the function is defined.
[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.
- Definition Classes
- TraversableProxyLike → TraversableLike → GenTraversableLike
Full Signaturedef collect[B, That](pf: PartialFunction[A, B])(implicit bf: CanBuildFrom[This, B, That]): That
-
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.
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.
- Definition Classes
- TraversableOnce
Seq("a", 1, 5L).collectFirst({ case x: Int => x*10 }) = Some(10)
Example: -
def
compose[A](g: (A) ⇒ A): (A) ⇒ Boolean
Composes two instances of Function1 in a new Function1, with this function applied last.
Composes two instances of Function1 in a new Function1, with this function applied last.
- A
the type to which function
g
can be applied- g
a function A => T1
- returns
a new function
f
such thatf(x) == apply(g(x))
- Definition Classes
- Function1
- Annotations
- @unspecialized()
-
def
contains(elem: A): Boolean
Tests if some element is contained in this set.
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
-
def
copyToArray(xs: Array[A]): Unit
[use case] Copies the elements of this set to an array.
[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
- TraversableProxyLike → TraversableOnce → GenTraversableOnce
-
def
copyToArray(xs: Array[A], start: Int): Unit
[use case] Copies the elements of this set to an array.
[use case]Copies the elements of this set to an array. Fills the given array
xs
with values of this set, beginning at indexstart
. 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
- TraversableProxyLike → TraversableOnce → GenTraversableOnce
-
def
copyToArray(xs: Array[A], start: Int, len: Int): Unit
[use case] Copies the elements of this set to an array.
[use case]Copies the elements of this set to an array. Fills the given array
xs
with at mostlen
elements of this set, starting at positionstart
. Copying will stop once either the end of the current set is reached, or the end of the target array is reached, orlen
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
-
def
copyToBuffer[B >: A](dest: Buffer[B]): Unit
Copies all elements of this traversable collection to a buffer.
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
-
def
count(p: (A) ⇒ Boolean): Int
Counts the number of elements in the traversable collection which satisfy a predicate.
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
.
- Definition Classes
- TraversableProxyLike → TraversableOnce → GenTraversableOnce
-
def
diff(that: GenSet[A]): This
Computes the difference of this set and another set.
Computes the difference of this set and another set.
- that
the set of elements to exclude.
- returns
a set containing those elements of this set that are not also contained in the given set
that
.
- Definition Classes
- SetProxyLike → SetLike → GenSetLike
-
def
drop(n: Int): This
Selects all elements except first n ones.
Selects all elements except first n ones.
Note: might return different results for different runs, unless the underlying collection type is ordered.
- n
the number of elements to drop from this 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. Ifn
is negative, don't drop any elements.
- Definition Classes
- TraversableProxyLike → TraversableLike → GenTraversableLike
-
def
dropRight(n: Int): This
Selects all elements except last n ones.
Selects all elements except last n ones.
Note: might return different results for different runs, unless the underlying collection type is ordered.
- n
The number of elements to 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.
- Definition Classes
- IterableProxyLike → IterableLike
-
def
dropWhile(p: (A) ⇒ Boolean): This
Drops longest prefix of elements that satisfy a predicate.
Drops longest prefix of elements that satisfy a predicate.
Note: might return different results for different runs, unless the underlying collection type is ordered.
- returns
the longest suffix of this traversable collection whose first element does not satisfy the predicate
p
.
- Definition Classes
- TraversableProxyLike → TraversableLike → GenTraversableLike
-
def
ensuring(cond: (SetProxyLike[A, This]) ⇒ Boolean, msg: ⇒ Any): SetProxyLike[A, This]
- Implicit
- This member is added by an implicit conversion from SetProxyLike[A, This] to Ensuring[SetProxyLike[A, This]] performed by method Ensuring in scala.Predef.
- Definition Classes
- Ensuring
-
def
ensuring(cond: (SetProxyLike[A, This]) ⇒ Boolean): SetProxyLike[A, This]
- Implicit
- This member is added by an implicit conversion from SetProxyLike[A, This] to Ensuring[SetProxyLike[A, This]] performed by method Ensuring in scala.Predef.
- Definition Classes
- Ensuring
-
def
ensuring(cond: Boolean, msg: ⇒ Any): SetProxyLike[A, This]
- Implicit
- This member is added by an implicit conversion from SetProxyLike[A, This] to Ensuring[SetProxyLike[A, This]] performed by method Ensuring in scala.Predef.
- Definition Classes
- Ensuring
-
def
ensuring(cond: Boolean): SetProxyLike[A, This]
- Implicit
- This member is added by an implicit conversion from SetProxyLike[A, This] to Ensuring[SetProxyLike[A, This]] performed by method Ensuring in scala.Predef.
- Definition Classes
- Ensuring
-
final
def
eq(arg0: AnyRef): Boolean
Tests whether the argument (
that
) is a reference to the receiver object (this
).Tests whether the argument (
that
) is a reference to the receiver object (this
).The
eq
method implements an equivalence relation on non-null instances ofAnyRef
, and has three additional properties:- It is consistent: for any non-null instances
x
andy
of typeAnyRef
, multiple invocations ofx.eq(y)
consistently returnstrue
or consistently returnsfalse
. - For any non-null instance
x
of typeAnyRef
,x.eq(null)
andnull.eq(x)
returnsfalse
. null.eq(null)
returnstrue
.
When overriding the
equals
orhashCode
methods, it is important to ensure that their behavior is consistent with reference equality. Therefore, if two objects are references to each other (o1 eq o2
), they should be equal to each other (o1 == o2
) and they should hash to the same value (o1.hashCode == o2.hashCode
).- returns
true
if the argument is a reference to the receiver object;false
otherwise.
- Definition Classes
- AnyRef
- It is consistent: for any non-null instances
-
def
equals(that: Any): Boolean
Compares the receiver object (
this
) with the argument object (that
) for equivalence.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)
returnstrue
) 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.
- It is reflexive: for any instance
-
def
exists(p: (A) ⇒ Boolean): Boolean
Tests whether a predicate holds for at least one element of this traversable collection.
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
-
def
filter(p: (A) ⇒ Boolean): This
Selects all elements of this traversable collection which satisfy a predicate.
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.
- Definition Classes
- TraversableProxyLike → TraversableLike → GenTraversableLike
-
def
filterNot(p: (A) ⇒ Boolean): This
Selects all elements of this traversable collection which do not satisfy a predicate.
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.
- Definition Classes
- TraversableProxyLike → TraversableLike → GenTraversableLike
-
def
finalize(): Unit
Called by the garbage collector on the receiver object when there are no more references to the object.
Called by the garbage collector on the receiver object when there are no more references to the object.
The details of when and if the
finalize
method is invoked, as well as the interaction betweenfinalize
and non-local returns and exceptions, are all platform dependent.- Attributes
- protected[lang]
- Definition Classes
- AnyRef
- Annotations
- @throws( classOf[java.lang.Throwable] )
- Note
not specified by SLS as a member of AnyRef
-
def
find(p: (A) ⇒ Boolean): Option[A]
Finds the first element of the traversable collection satisfying a predicate, if any.
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.
- Definition Classes
- TraversableProxyLike → TraversableLike → TraversableOnce → GenTraversableOnce
-
def
flatMap[B](f: (A) ⇒ GenTraversableOnce[B]): Set[B]
[use case] Builds a new collection by applying a function to all elements of this set and using the elements of the resulting collections.
[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:
def getWords(lines: Seq[String]): Seq[String] = lines flatMap (line => line split "\\W+")
The type of the resulting collection is guided by the static type of set. This might cause unexpected results sometimes. For example:
// lettersOf will return a Seq[Char] of likely repeated letters, instead of a Set def lettersOf(words: Seq[String]) = words flatMap (word => word.toSet) // lettersOf will return a Set[Char], not a Seq def lettersOf(words: Seq[String]) = words.toSet flatMap (word => word.toSeq) // xs will be an Iterable[Int] val xs = Map("a" -> List(11,111), "b" -> List(22,222)).flatMap(_._2) // ys will be a Map[Int, Int] val ys = Map("a" -> List(1 -> 11,1 -> 111), "b" -> List(2 -> 22,2 -> 222)).flatMap(_._2)
- B
the element type of the returned collection.
- f
the function to apply to each element.
- returns
a new set resulting from applying the given collection-valued function
f
to each element of this set and concatenating the results.
- Definition Classes
- TraversableProxyLike → TraversableLike → GenTraversableLike → FilterMonadic
Full Signaturedef flatMap[B, That](f: (A) ⇒ GenTraversableOnce[B])(implicit bf: CanBuildFrom[This, B, That]): That
-
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.
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
.- z
a neutral element for the fold operation; may be added to the result an arbitrary number of times, and must not change the result (e.g.,
Nil
for list concatenation, 0 for addition, or 1 for multiplication).- op
a binary operator that must be associative.
- returns
the result of applying the fold operator
op
between all the elements andz
, orz
if this traversable or iterator is empty.
- Definition Classes
- TraversableOnce → GenTraversableOnce
-
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.
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:op(...op(z, x_1), x_2, ..., x_n)
where
x1, ..., xn
are the elements of this traversable collection. Returnsz
if this traversable collection is empty.
- Definition Classes
- TraversableProxyLike → TraversableOnce → GenTraversableOnce
-
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.
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:op(x_1, op(x_2, ... op(x_n, z)...))
where
x1, ..., xn
are the elements of this traversable collection. Returnsz
if this traversable collection is empty.
- Definition Classes
- TraversableProxyLike → TraversableOnce → GenTraversableOnce
-
def
forall(p: (A) ⇒ Boolean): Boolean
Tests whether a predicate holds for all elements of this traversable collection.
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
-
def
foreach(f: (A) ⇒ Unit): Unit
[use case] Applies a function
f
to all elements of this set.[use case]Applies a function
f
to all elements of this 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.
- Definition Classes
- TraversableProxyLike → TraversableLike → GenTraversableLike → TraversableOnce → GenTraversableOnce → FilterMonadic
Full Signaturedef foreach[U](f: (A) ⇒ U): Unit
-
def
formatted(fmtstr: String): String
Returns string formatted according to given
format
string.Returns string formatted according to given
format
string. Format strings are as forString.format
(@see java.lang.String.format).- Implicit
- This member is added by an implicit conversion from SetProxyLike[A, This] to StringFormat[SetProxyLike[A, This]] performed by method StringFormat in scala.Predef.
- Definition Classes
- StringFormat
- Annotations
- @inline()
-
final
def
getClass(): Class[_]
Returns the runtime class representation of the object.
-
def
groupBy[K](f: (A) ⇒ K): immutable.Map[K, This]
Partitions this traversable collection into a map of traversable collections according to some discriminator function.
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:
(xs groupBy f)(k) = xs filter (x => f(x) == k)
That is, every key
k
is bound to a traversable collection of those elementsx
for whichf(x)
equalsk
.
- Definition Classes
- TraversableProxyLike → TraversableLike → GenTraversableLike
-
def
grouped(size: Int): Iterator[This]
Partitions elements in fixed size iterable collections.
Partitions elements in fixed size iterable collections.
- size
the number of elements per group
- returns
An iterator producing iterable collections of size
size
, except the last will be less than sizesize
if the elements don't divide evenly.
- Definition Classes
- IterableProxyLike → IterableLike
- See also
scala.collection.Iterator, method
grouped
-
def
hasDefiniteSize: Boolean
Tests whether this traversable collection is known to have a finite size.
Tests whether this traversable collection is known to have a finite size. All strict collections are known to have finite size. For a non-strict collection such as
Stream
, the predicate returnstrue
if all elements have been computed. It returnsfalse
if the stream is not yet evaluated to the end. Non-empty Iterators usually returnfalse
even if they were created from a collection with a known finite size.Note: many collection methods will not work on collections of infinite sizes. The typical failure mode is an infinite loop. These methods always attempt a traversal without checking first that
hasDefiniteSize
returnstrue
. However, checkinghasDefiniteSize
can provide an assurance that size is well-defined and non-termination is not a concern.- returns
true
if this collection is known to have finite size,false
otherwise.
- Definition Classes
- TraversableProxyLike → TraversableLike → TraversableOnce → GenTraversableOnce
-
def
hashCode(): Int
Calculate a hash code value for the object.
Calculate a hash code value for the object.
The default hashing algorithm is platform dependent.
Note that it is allowed for two objects to have identical hash codes (
o1.hashCode.equals(o2.hashCode)
) yet not be equal (o1.equals(o2)
returnsfalse
). A degenerate implementation could always return0
. However, it is required that if two objects are equal (o1.equals(o2)
returnstrue
) that they have identical hash codes (o1.hashCode.equals(o2.hashCode)
). Therefore, when overriding this method, be sure to verify that the behavior is consistent with theequals
method.- returns
the hash code value for this object.
-
def
head: A
Selects the first element of this traversable collection.
Selects the first element of this traversable collection.
Note: might return different results for different runs, unless the underlying collection type is ordered.
- returns
the first element of this traversable collection.
- Definition Classes
- TraversableProxyLike → TraversableLike → GenTraversableLike
- Exceptions thrown
NoSuchElementException
if the traversable collection is empty.
-
def
headOption: Option[A]
Optionally selects the first element.
Optionally selects the first element.
Note: might return different results for different runs, unless the underlying collection type is ordered.
- returns
the first element of this traversable collection if it is nonempty,
None
if it is empty.
- Definition Classes
- TraversableProxyLike → TraversableLike → GenTraversableLike
-
def
init: This
Selects all elements except the last.
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.
-
def
inits: Iterator[This]
Iterates over the inits of this traversable collection.
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
List(1,2,3).inits = Iterator(List(1,2,3), List(1,2), List(1), Nil)
Example: -
def
intersect(that: GenSet[A]): This
Computes the intersection between this set and another set.
Computes the intersection between this set and another set.
- that
the set to intersect with.
- returns
a new set consisting of all elements that are both in this set and in the given set
that
.
- Definition Classes
- SetProxyLike → GenSetLike
-
def
isEmpty: Boolean
Tests whether this set is empty.
Tests whether this set is empty.
- returns
true
if the set contain no elements,false
otherwise.
- Definition Classes
- SetProxyLike → TraversableProxyLike → SetLike → IterableLike → TraversableLike → TraversableOnce → GenTraversableOnce
-
final
def
isInstanceOf[T0]: Boolean
Test whether the dynamic type of the receiver object is
T0
.Test whether the dynamic type of the receiver object is
T0
.Note that the result of the test is modulo Scala's erasure semantics. Therefore the expression
1.isInstanceOf[String]
will returnfalse
, while the expressionList(1).isInstanceOf[List[String]]
will returntrue
. In the latter example, because the type argument is erased as part of compilation it is not possible to check whether the contents of the list are of the specified type.- returns
true
if the receiver object is an instance of erasure of typeT0
;false
otherwise.
- Definition Classes
- Any
-
final
def
isTraversableAgain: Boolean
Tests whether this traversable collection can be repeatedly traversed.
Tests whether this traversable collection can be repeatedly traversed.
- returns
true
- Definition Classes
- TraversableLike → GenTraversableLike → GenTraversableOnce
-
def
iterator: Iterator[A]
Creates a new iterator over all elements contained in this iterable object.
Creates a new iterator over all elements contained in this iterable object.
- returns
the new iterator
- Definition Classes
- IterableProxyLike → IterableLike → GenIterableLike
-
def
last: A
Selects the last element.
Selects the last element.
Note: might return different results for different runs, unless the underlying collection type is ordered.
- returns
The last element of this traversable collection.
- Definition Classes
- TraversableProxyLike → TraversableLike → GenTraversableLike
- Exceptions thrown
NoSuchElementException
If the traversable collection is empty.
-
def
lastOption: Option[A]
Optionally selects the last element.
Optionally selects the last element.
Note: might return different results for different runs, unless the underlying collection type is ordered.
- returns
the last element of this traversable collection$ if it is nonempty,
None
if it is empty.
- Definition Classes
- TraversableProxyLike → TraversableLike → GenTraversableLike
-
def
map[B](f: (A) ⇒ B): Set[B]
[use case] Builds a new collection by applying a function to all elements of this set.
[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.
- Definition Classes
- TraversableProxyLike → TraversableLike → GenTraversableLike → FilterMonadic
Full Signaturedef map[B, That](f: (A) ⇒ B)(implicit bf: CanBuildFrom[This, B, That]): That
-
def
max: A
[use case] Finds the largest element.
[use case]Finds the largest element.
- returns
the largest element of this set.
- Definition Classes
- TraversableProxyLike → TraversableOnce → GenTraversableOnce
- Exceptions thrown
UnsupportedOperationException
if this set is empty.
Full Signaturedef max[B >: A](implicit cmp: Ordering[B]): A
-
def
maxBy[B](f: (A) ⇒ B): A
[use case] Finds the first element which yields the largest value measured by function f.
[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
- Exceptions thrown
UnsupportedOperationException
if this set is empty.
Full Signaturedef maxBy[B](f: (A) ⇒ B)(implicit cmp: Ordering[B]): A
-
def
min: A
[use case] Finds the smallest element.
[use case]Finds the smallest element.
- returns
the smallest element of this set
- Definition Classes
- TraversableProxyLike → TraversableOnce → GenTraversableOnce
- Exceptions thrown
UnsupportedOperationException
if this set is empty.
Full Signaturedef min[B >: A](implicit cmp: Ordering[B]): A
-
def
minBy[B](f: (A) ⇒ B): A
[use case] Finds the first element which yields the smallest value measured by function f.
[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
- Exceptions thrown
UnsupportedOperationException
if this set is empty.
Full Signaturedef minBy[B](f: (A) ⇒ B)(implicit cmp: Ordering[B]): A
-
def
mkString: String
Displays all elements of this traversable collection in a string.
Displays all elements of this traversable collection in a 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 follow each other without any separator string.
- Definition Classes
- TraversableProxyLike → TraversableOnce → GenTraversableOnce
-
def
mkString(sep: String): String
Displays all elements of this traversable collection in a string using a separator 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
.
- Definition Classes
- TraversableProxyLike → TraversableOnce → GenTraversableOnce
List(1, 2, 3).mkString("|") = "1|2|3"
Example: -
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.
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
.
- Definition Classes
- TraversableProxyLike → TraversableOnce → GenTraversableOnce
List(1, 2, 3).mkString("(", "; ", ")") = "(1; 2; 3)"
Example: -
final
def
ne(arg0: AnyRef): Boolean
Equivalent to
!(this eq that)
.Equivalent to
!(this eq that)
.- returns
true
if the argument is not a reference to the receiver object;false
otherwise.
- Definition Classes
- AnyRef
-
def
newBuilder: Builder[A, This]
A common implementation of
newBuilder
for all sets in terms ofempty
.A common implementation of
newBuilder
for all sets in terms ofempty
. Overridden for mutable sets in `mutable.SetLike`.- Attributes
- protected[this]
- Definition Classes
- SetLike → TraversableLike → HasNewBuilder
-
def
nonEmpty: Boolean
Tests whether the traversable collection is not empty.
Tests whether the traversable collection is not empty.
- returns
true
if the traversable collection contains at least one element,false
otherwise.
- Definition Classes
- TraversableProxyLike → TraversableOnce → GenTraversableOnce
-
final
def
notify(): Unit
Wakes up a single thread that is waiting on the receiver object's monitor.
Wakes up a single thread that is waiting on the receiver object's monitor.
- Definition Classes
- AnyRef
- Annotations
- @native()
- Note
not specified by SLS as a member of AnyRef
-
final
def
notifyAll(): Unit
Wakes up all threads that are waiting on the receiver object's monitor.
Wakes up all threads that are waiting on the receiver object's monitor.
- Definition Classes
- AnyRef
- Annotations
- @native()
- Note
not specified by SLS as a member of AnyRef
-
def
par: ParSet[A]
Returns a parallel implementation of this collection.
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
ormutable.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
-
def
parCombiner: Combiner[A, ParSet[A]]
The default
par
implementation uses the combiner provided by this method to create a new parallel collection.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
- Attributes
- protected[this]
- Definition Classes
- SetLike → TraversableLike → Parallelizable
-
def
partition(p: (A) ⇒ Boolean): (This, This)
Partitions this traversable collection in two traversable collections according to a predicate.
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.
- Definition Classes
- TraversableProxyLike → TraversableLike → GenTraversableLike
-
def
product: A
[use case] Multiplies up the elements of this collection.
[use case]Multiplies up the elements of this collection.
- returns
the product of all elements in this set of numbers of type
Int
. Instead ofInt
, any other typeT
with an implicitNumeric[T]
implementation can be used as element type of the set and as result type ofproduct
. Examples of such types are:Long
,Float
,Double
,BigInt
.
- Definition Classes
- TraversableProxyLike → TraversableOnce → GenTraversableOnce
Full Signaturedef product[B >: A](implicit num: Numeric[B]): B
-
def
reduce[A1 >: A](op: (A1, A1) ⇒ A1): A1
Reduces the elements of this traversable or iterator using the specified associative binary operator.
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
.- 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.
- Definition Classes
- TraversableOnce → GenTraversableOnce
- Exceptions thrown
UnsupportedOperationException
if this traversable or iterator is empty.
-
def
reduceLeft[B >: A](op: (B, A) ⇒ B): B
Applies a binary operator to all elements of this traversable collection, going left to right.
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:op( op( ... op(x_1, x_2) ..., x_{n-1}), x_n)
where
x1, ..., xn
are the elements of this traversable collection.
- Definition Classes
- TraversableProxyLike → TraversableOnce
- Exceptions thrown
UnsupportedOperationException
if this traversable collection is empty.
-
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.
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.
- Definition Classes
- TraversableProxyLike → TraversableOnce → GenTraversableOnce
-
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.
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
.- 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.
- Definition Classes
- TraversableOnce → GenTraversableOnce
-
def
reduceRight[B >: A](op: (A, B) ⇒ B): B
Applies a binary operator to all elements of this traversable collection, going right to left.
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:op(x_1, op(x_2, ..., op(x_{n-1}, x_n)...))
where
x1, ..., xn
are the elements of this traversable collection.
- Definition Classes
- TraversableProxyLike → TraversableOnce → GenTraversableOnce
- Exceptions thrown
UnsupportedOperationException
if this traversable collection is empty.
-
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.
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.
- Definition Classes
- TraversableProxyLike → TraversableOnce → GenTraversableOnce
-
def
repr: This
The collection of type traversable collection underlying this
TraversableLike
object.The collection of type traversable collection underlying this
TraversableLike
object. By default this is implemented as theTraversableLike
object itself, but this can be overridden.- Definition Classes
- TraversableLike → GenTraversableLike
-
def
reversed: List[A]
- Attributes
- protected[this]
- Definition Classes
- TraversableOnce
-
def
sameElements(that: GenIterable[A]): Boolean
[use case] Checks if the other iterable collection contains the same elements in the same order as this set.
[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
- IterableProxyLike → IterableLike → GenIterableLike
Full Signaturedef sameElements[B >: A](that: GenIterable[B]): Boolean
-
def
scan[B >: A, That](z: B)(op: (B, B) ⇒ B)(implicit cbf: CanBuildFrom[This, B, That]): That
Computes a prefix scan of the elements of the collection.
Computes a prefix scan of the elements of the collection.
Note: The neutral element
z
may be applied more than once.- B
element type of the resulting collection
- That
type of the resulting collection
- z
neutral element for the operator
op
- 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
-
def
scanLeft[B, That](z: B)(op: (B, A) ⇒ B)(implicit bf: CanBuildFrom[This, B, That]): That
Produces a collection containing cumulative results of applying the operator going left to right.
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 the new element typeB
.- returns
collection with intermediate results
- Definition Classes
- TraversableProxyLike → TraversableLike → GenTraversableLike
-
def
scanRight[B, That](z: B)(op: (A, B) ⇒ B)(implicit bf: CanBuildFrom[This, B, That]): That
Produces a collection containing cumulative results of applying the operator going right to left.
Produces a collection containing cumulative results of applying the operator going right to left. The head of the collection is the last cumulative result.
Note: will not terminate for infinite-sized collections.
Note: might return different results for different runs, unless the underlying collection type is ordered.
Example:
List(1, 2, 3, 4).scanRight(0)(_ + _) == List(10, 9, 7, 4, 0)
- 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 the new element typeB
.- returns
collection with intermediate results
- Definition Classes
- TraversableProxyLike → TraversableLike → GenTraversableLike
-
def
size: Int
The size of this traversable collection.
The size of this traversable collection.
Note: will not terminate for infinite-sized collections.
- returns
the number of elements in this traversable collection.
- Definition Classes
- TraversableProxyLike → GenTraversableLike → TraversableOnce → GenTraversableOnce
-
def
sizeHintIfCheap: Int
The size of this collection or iterator, if it can be cheaply computed
The size of this collection or iterator, if it can be cheaply computed
- returns
the number of elements in this collection or iterator, or -1 if the size cannot be determined cheaply
- Attributes
- protected[collection]
- Definition Classes
- GenTraversableOnce
-
def
slice(from: Int, until: Int): This
Selects an interval of elements.
Selects an interval of elements. The returned collection is made up of all elements
x
which satisfy the invariant:from <= indexOf(x) < until
Note: might return different results for different runs, unless the underlying collection type is ordered.
- 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.
- Definition Classes
- TraversableProxyLike → TraversableLike → GenTraversableLike
-
def
sliding(size: Int, step: Int): Iterator[This]
Groups elements in fixed size blocks by passing a "sliding window" over them (as opposed to partitioning them, as is done in grouped.)
Groups elements in fixed size blocks by passing a "sliding window" over them (as opposed to partitioning them, as is done in grouped.)
- size
the number of elements per group
- step
the distance between the first elements of successive groups
- returns
An iterator producing iterable collections of size
size
, except the last element (which may be the only element) will be truncated if there are fewer thansize
elements remaining to be grouped.
- Definition Classes
- IterableProxyLike → IterableLike
- See also
scala.collection.Iterator, method
sliding
-
def
sliding(size: Int): Iterator[This]
Groups elements in fixed size blocks by passing a "sliding window" over them (as opposed to partitioning them, as is done in
grouped
.) The "sliding window" step is set to one.Groups elements in fixed size blocks by passing a "sliding window" over them (as opposed to partitioning them, as is done in
grouped
.) The "sliding window" step is set to one.- size
the number of elements per group
- returns
An iterator producing iterable collections of size
size
, except the last element (which may be the only element) will be truncated if there are fewer thansize
elements remaining to be grouped.
- Definition Classes
- IterableProxyLike → IterableLike
- See also
scala.collection.Iterator, method
sliding
-
def
span(p: (A) ⇒ Boolean): (This, This)
Splits this traversable collection into a prefix/suffix pair according to a predicate.
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 predicatep
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.
- Definition Classes
- TraversableProxyLike → TraversableLike → GenTraversableLike
-
def
splitAt(n: Int): (This, This)
Splits this traversable collection into two at a given position.
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.
- Definition Classes
- TraversableProxyLike → TraversableLike → GenTraversableLike
-
def
stringPrefix: String
Defines the prefix of this object's
toString
representation.Defines the prefix of this object's
toString
representation.- returns
a string representation which starts the result of
toString
applied to this traversable collection. By default the string prefix is the simple name of the collection class traversable collection.
- Definition Classes
- TraversableProxyLike → TraversableLike → GenTraversableLike
-
def
subsetOf(that: GenSet[A]): Boolean
Tests whether this set is a subset of another set.
Tests whether this set is a subset of another set.
- that
the set to test.
- returns
true
if this set is a subset ofthat
, i.e. if every element of this set is also an element ofthat
.
- Definition Classes
- SetProxyLike → GenSetLike
-
def
subsets(): Iterator[This]
An iterator over all subsets of this set.
-
def
subsets(len: Int): Iterator[This]
An iterator over all subsets of this set of the given size.
An iterator over all subsets of this set of the given size. If the requested size is impossible, an empty iterator is returned.
- len
the size of the subsets.
- returns
the iterator.
- Definition Classes
- SetLike
-
def
sum: A
[use case] Sums up the elements of this collection.
[use case]Sums up the elements of this collection.
- returns
the sum of all elements in this set of numbers of type
Int
. Instead ofInt
, any other typeT
with an implicitNumeric[T]
implementation can be used as element type of the set and as result type ofsum
. Examples of such types are:Long
,Float
,Double
,BigInt
.
- Definition Classes
- TraversableProxyLike → TraversableOnce → GenTraversableOnce
Full Signaturedef sum[B >: A](implicit num: Numeric[B]): B
-
final
def
synchronized[T0](arg0: ⇒ T0): T0
- Definition Classes
- AnyRef
-
def
tail: This
Selects all elements except the first.
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
java.lang.UnsupportedOperationException
if the traversable collection is empty.
-
def
tails: Iterator[This]
Iterates over the tails of this traversable collection.
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
List(1,2,3).tails = Iterator(List(1,2,3), List(2,3), List(3), Nil)
Example: -
def
take(n: Int): This
Selects first n elements.
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. Ifn
is negative, returns an empty traversable collection.
- Definition Classes
- TraversableProxyLike → TraversableLike → GenTraversableLike
-
def
takeRight(n: Int): This
Selects last n elements.
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.
- Definition Classes
- IterableProxyLike → IterableLike
-
def
takeWhile(p: (A) ⇒ Boolean): This
Takes longest prefix of elements that satisfy a predicate.
Takes longest prefix of elements that satisfy a predicate.
Note: might return different results for different runs, unless the underlying collection type is ordered.
- returns
the longest prefix of this traversable collection whose elements all satisfy the predicate
p
.
- Definition Classes
- TraversableProxyLike → TraversableLike → GenTraversableLike
-
def
thisCollection: Iterable[A]
The underlying collection seen as an instance of
Iterable
.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
-
def
to[Col[_]]: Col[A]
[use case] Converts this set into another by copying all elements.
[use case]Converts this set into another by copying all elements.
- Col
The collection type to build.
- returns
a new collection containing all elements of this set.
- Definition Classes
- TraversableLike → TraversableOnce → GenTraversableOnce
Full Signaturedef to[Col[_]](implicit cbf: CanBuildFrom[Nothing, A, Col[A]]): Col[A]
-
def
toArray: Array[A]
[use case] Converts this set to an array.
[use case]Converts this set to an array.
- returns
an array containing all elements of this set. An
ClassTag
must be available for the element type of this set.
- Definition Classes
- TraversableProxyLike → TraversableOnce → GenTraversableOnce
-
def
toBuffer[B >: A]: Buffer[B]
Uses the contents of this traversable collection to create a new mutable buffer.
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
-
def
toCollection(repr: This): Iterable[A]
A conversion from collections of type
Repr
toIterable
objects.A conversion from collections of type
Repr
toIterable
objects. By default this is implemented as just a cast, but this can be overridden.- Attributes
- protected[this]
- Definition Classes
- IterableLike → TraversableLike
-
def
toIndexedSeq: immutable.IndexedSeq[A]
Converts this traversable collection to an indexed sequence.
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
-
def
toIterable: Iterable[A]
Converts this traversable collection to an iterable collection.
Converts this traversable collection to an iterable collection. Note that the choice of target
Iterable
is lazy in this default implementation as thisTraversableOnce
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.
- Definition Classes
- TraversableProxyLike → TraversableOnce → GenTraversableOnce
-
def
toIterator: Iterator[A]
Returns an Iterator over the elements in this traversable collection.
Returns an Iterator over the elements in this traversable collection. Will return the same Iterator if this instance is already an Iterator.
Note: will not terminate for infinite-sized collections.
- returns
an Iterator containing all elements of this traversable collection.
- Definition Classes
- TraversableProxyLike → TraversableLike → GenTraversableOnce
-
def
toList: List[A]
Converts this traversable collection to a list.
Converts this traversable collection to a list.
Note: will not terminate for infinite-sized collections.
- returns
a list containing all elements of this traversable collection.
- Definition Classes
- TraversableProxyLike → TraversableOnce → GenTraversableOnce
-
def
toMap[T, U]: Map[T, U]
[use case] Converts this set to a map.
[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.
- Definition Classes
- TraversableProxyLike → TraversableOnce → GenTraversableOnce
Full Signaturedef toMap[T, U](implicit ev: <:<[A, (T, U)]): immutable.Map[T, U]
-
def
toParArray: ParArray[T]
- Implicit
- This member is added by an implicit conversion from SetProxyLike[A, This] to CollectionsHaveToParArray[SetProxyLike[A, This], T] performed by method CollectionsHaveToParArray in scala.collection.parallel. This conversion will take place only if an implicit value of type (SetProxyLike[A, This]) ⇒ GenTraversableOnce[T] is in scope.
- Definition Classes
- CollectionsHaveToParArray
-
def
toSeq: Seq[A]
Converts this traversable collection to a sequence.
Converts this traversable collection to a sequence. As with
toIterable
, it's lazy in this default implementation, as thisTraversableOnce
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
-
def
toSet[B >: A]: immutable.Set[B]
Converts this traversable collection to a set.
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
-
def
toStream: Stream[A]
Converts this traversable collection to a stream.
Converts this traversable collection to a stream.
- returns
a stream containing all elements of this traversable collection.
- Definition Classes
- TraversableProxyLike → TraversableLike → GenTraversableOnce
-
def
toString(): String
Returns a string representation of the object.
-
def
toTraversable: Traversable[A]
Converts this traversable collection to an unspecified Traversable.
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
-
def
toVector: Vector[A]
Converts this traversable or iterator to a Vector.
Converts this traversable or iterator to a Vector.
Note: will not terminate for infinite-sized collections.
- returns
a vector containing all elements of this traversable or iterator.
- Definition Classes
- TraversableOnce → GenTraversableOnce
-
def
union(that: GenSet[A]): This
Computes the union between of set and another set.
Computes the union between of set and another set.
- that
the set to form the union with.
- returns
a new set consisting of all elements that are in this set or in the given set
that
.
- Definition Classes
- SetProxyLike → SetLike → GenSetLike
-
def
view(from: Int, until: Int): IterableView[A, This]
Creates a non-strict view of a slice of this iterable collection.
Creates a non-strict view of a slice of this iterable collection.
Note: the difference between
view
andslice
is thatview
produces a view of the current iterable collection, whereasslice
produces a new iterable collection.Note:
view(from, to)
is equivalent toview.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
.
- Definition Classes
- IterableProxyLike → TraversableProxyLike → IterableLike → TraversableLike
-
def
view: IterableView[A, This]
Creates a non-strict view of this iterable collection.
Creates a non-strict view of this iterable collection.
- returns
a non-strict view of this iterable collection.
- Definition Classes
- IterableProxyLike → TraversableProxyLike → IterableLike → TraversableLike
-
final
def
wait(): Unit
- Definition Classes
- AnyRef
- Annotations
- @throws( ... )
-
final
def
wait(arg0: Long, arg1: Int): Unit
- Definition Classes
- AnyRef
- Annotations
- @throws( ... )
- final def wait(arg0: Long): Unit
-
def
withFilter(p: (A) ⇒ Boolean): FilterMonadic[A, This]
Creates a non-strict filter of this traversable collection.
Creates a non-strict filter of this traversable collection.
Note: the difference between
c filter p
andc withFilter p
is that the former creates a new collection, whereas the latter only restricts the domain of subsequentmap
,flatMap
,foreach
, andwithFilter
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
.
- Definition Classes
- TraversableLike → FilterMonadic
-
def
zip[B](that: GenIterable[B]): Set[(A, B)]
[use case] Returns a set formed from this set and another iterable collection by combining corresponding elements in pairs.
[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
.
- Definition Classes
- IterableProxyLike → IterableLike → GenIterableLike
Full Signaturedef zip[A1 >: A, B, That](that: GenIterable[B])(implicit bf: CanBuildFrom[This, (A1, B), That]): That
-
def
zipAll[B](that: Iterable[B], thisElem: A, thatElem: B): Set[(A, B)]
[use case] Returns a set formed from this set and another iterable collection by combining corresponding elements in pairs.
[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
.- thatElem
the element to be used to fill up the result if
that
is shorter than this set.- 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.
- Definition Classes
- IterableProxyLike → IterableLike → GenIterableLike
Full Signaturedef zipAll[B, A1 >: A, That](that: GenIterable[B], thisElem: A1, thatElem: B)(implicit bf: CanBuildFrom[This, (A1, B), That]): That
-
def
zipWithIndex: Set[(A, Int)]
[use case] Zips this set with its indices.
[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
.
- Definition Classes
- IterableProxyLike → IterableLike → GenIterableLike
List("a", "b", "c").zipWithIndex = List(("a", 0), ("b", 1), ("c", 2))
Full Signaturedef zipWithIndex[A1 >: A, That](implicit bf: CanBuildFrom[This, (A1, Int), That]): That
Example: -
def
|(that: GenSet[A]): This
Computes the union between this set and another set.
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
.
- Definition Classes
- SetProxyLike → GenSetLike
-
def
→[B](y: B): (SetProxyLike[A, This], B)
- Implicit
- This member is added by an implicit conversion from SetProxyLike[A, This] to ArrowAssoc[SetProxyLike[A, This]] performed by method ArrowAssoc in scala.Predef.
- Definition Classes
- ArrowAssoc
Shadowed Implicit Value Members
-
def
+(other: String): String
- Implicit
- This member is added by an implicit conversion from SetProxyLike[A, This] to any2stringadd[SetProxyLike[A, This]] performed by method any2stringadd in scala.Predef.
- Shadowing
- This implicitly inherited member is shadowed by one or more members in this class.
To access this member you can use a type ascription:(setProxyLike: any2stringadd[SetProxyLike[A, This]]).+(other)
- Definition Classes
- any2stringadd
-
def
filter(p: (A) ⇒ Boolean): TraversableOnce[A]
- Implicit
- This member is added by an implicit conversion from SetProxyLike[A, This] to MonadOps[A] performed by method MonadOps in scala.collection.TraversableOnce.
- Shadowing
- This implicitly inherited member is shadowed by one or more members in this class.
To access this member you can use a type ascription:(setProxyLike: MonadOps[A]).filter(p)
- Definition Classes
- MonadOps
-
def
flatMap[B](f: (A) ⇒ GenTraversableOnce[B]): TraversableOnce[B]
- Implicit
- This member is added by an implicit conversion from SetProxyLike[A, This] to MonadOps[A] performed by method MonadOps in scala.collection.TraversableOnce.
- Shadowing
- This implicitly inherited member is shadowed by one or more members in this class.
To access this member you can use a type ascription:(setProxyLike: MonadOps[A]).flatMap(f)
- Definition Classes
- MonadOps
-
def
map[B](f: (A) ⇒ B): TraversableOnce[B]
- Implicit
- This member is added by an implicit conversion from SetProxyLike[A, This] to MonadOps[A] performed by method MonadOps in scala.collection.TraversableOnce.
- Shadowing
- This implicitly inherited member is shadowed by one or more members in this class.
To access this member you can use a type ascription:(setProxyLike: MonadOps[A]).map(f)
- Definition Classes
- MonadOps
-
def
withFilter(p: (A) ⇒ Boolean): Iterator[A]
- Implicit
- This member is added by an implicit conversion from SetProxyLike[A, This] to MonadOps[A] performed by method MonadOps in scala.collection.TraversableOnce.
- Shadowing
- This implicitly inherited member is shadowed by one or more members in this class.
To access this member you can use a type ascription:(setProxyLike: MonadOps[A]).withFilter(p)
- Definition Classes
- MonadOps
This is the documentation for the Scala standard library.
Package structure
The scala package contains core types like
Int
,Float
,Array
orOption
which are accessible in all Scala compilation units without explicit qualification or imports.Notable packages include:
scala.collection
and its sub-packages contain Scala's collections frameworkscala.collection.immutable
- Immutable, sequential data-structures such asVector
,List
,Range
,HashMap
orHashSet
scala.collection.mutable
- Mutable, sequential data-structures such asArrayBuffer
,StringBuilder
,HashMap
orHashSet
scala.collection.concurrent
- Mutable, concurrent data-structures such asTrieMap
scala.collection.parallel.immutable
- Immutable, parallel data-structures such asParVector
,ParRange
,ParHashMap
orParHashSet
scala.collection.parallel.mutable
- Mutable, parallel data-structures such asParArray
,ParHashMap
,ParTrieMap
orParHashSet
scala.concurrent
- Primitives for concurrent programming such asFutures
andPromises
scala.io
- Input and output operationsscala.math
- Basic math functions and additional numeric types likeBigInt
andBigDecimal
scala.sys
- Interaction with other processes and the operating systemscala.util.matching
- Regular expressionsOther packages exist. See the complete list on the right.
Additional parts of the standard library are shipped as separate libraries. These include:
scala.reflect
- Scala's reflection API (scala-reflect.jar)scala.xml
- XML parsing, manipulation, and serialization (scala-xml.jar)scala.swing
- A convenient wrapper around Java's GUI framework called Swing (scala-swing.jar)scala.util.parsing
- Parser combinators (scala-parser-combinators.jar)Automatic imports
Identifiers in the scala package and the
scala.Predef
object are always in scope by default.Some of these identifiers are type aliases provided as shortcuts to commonly used classes. For example,
List
is an alias forscala.collection.immutable.List
.Other aliases refer to classes provided by the underlying platform. For example, on the JVM,
String
is an alias forjava.lang.String
.