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Scala 3/scala/Enumeration/ValueSet

ValueSet

scala.Enumeration.ValueSet
See theValueSet companion object
class ValueSet extends AbstractSet[Value], SortedSet[Value], SortedSetOps[Value, SortedSet, ValueSet], StrictOptimizedIterableOps[Value, Set, ValueSet], Serializable

A class for sets of values. Iterating through this set will yield values in increasing order of their ids.

Value parameters

nnIds

The set of ids of values (adjusted so that the lowest value does not fall below zero), organized as a BitSet.

Attributes

Companion
object
Source
Enumeration.scala
Graph
Supertypes
trait Serializable
trait SortedSet[Value]
trait SortedSet[Value]
trait Set[Value]
trait Iterable[Value]
trait Set[Value]
trait Equals
trait Value => Boolean
trait Iterable[Value]
class Object
trait Matchable
class Any
Show all

Members list

Value members

Concrete methods

override def className: String

Defines the prefix of this object's toString representation.

Defines the prefix of this object's toString representation.

It is recommended to return the name of the concrete collection type, but not implementation subclasses. For example, for ListMap this method should return "ListMap", not "Map" (the supertype) or "Node" (an implementation subclass).

The default implementation returns "Iterable". It is overridden for the basic collection kinds "Seq", "IndexedSeq", "LinearSeq", "Buffer", "Set", "Map", "SortedSet", "SortedMap" and "View".

Attributes

Returns

a string representation which starts the result of toString applied to this $coll. By default the string prefix is the simple name of the collection class $coll.

Definition Classes
Source
Enumeration.scala
override def collect[B](pf: PartialFunction[Value, B])(implicit ev: Ordering[B]): SortedSet[B]

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

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

Type parameters

B

the element type of the returned collection.

Value parameters

pf

the partial function which filters and maps the $coll.

Attributes

Returns

a new $coll 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
Source
Enumeration.scala
def contains(v: Value): Boolean

Attributes

Source
Enumeration.scala
override def empty: ValueSet

The empty iterable of the same type as this iterable

The empty iterable of the same type as this iterable

Attributes

Returns

an empty iterable of type C.

Definition Classes
Source
Enumeration.scala
def excl(value: Value): ValueSet

Creates a new set with a given element removed from this set.

Creates a new set with a given element removed from this set.

Value parameters

elem

the element to be removed

Attributes

Returns

a new set that contains all elements of this set but that does not contain elem.

Source
Enumeration.scala
def flatMap(f: Value => IterableOnce[Value]): ValueSet

Attributes

Source
Enumeration.scala
override def flatMap[B](f: Value => IterableOnce[B])(implicit ev: Ordering[B]): SortedSet[B]

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

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

Type parameters

B

the element type of the returned collection.

Value parameters

f

the function to apply to each element.

Attributes

Returns

a new $coll resulting from applying the given collection-valued function f to each element of this $coll and concatenating the results.

Definition Classes
Source
Enumeration.scala
def incl(value: Value): ValueSet

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.

Value parameters

elem

the element to be added

Attributes

Returns

a new set that contains all elements of this set and that also contains elem.

Source
Enumeration.scala
override def isEmpty: Boolean

Tests whether the $coll is empty.

Tests whether the $coll is empty.

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

Attributes

Returns

true if the $coll contains no elements, false otherwise.

Definition Classes
Source
Enumeration.scala
def iterator: Iterator[Value]

Iterator can be used only once

Iterator can be used only once

Attributes

Source
Enumeration.scala
override def iteratorFrom(start: Value): Iterator[Value]

Creates an iterator that contains all values from this collection greater than or equal to start according to the ordering of this collection.

Creates an iterator that contains all values from this collection greater than or equal to start according to the ordering of this collection. x.iteratorFrom(y) is equivalent to but will usually be more efficient than x.from(y).iterator

Value parameters

start

The lower-bound (inclusive) of the iterator

Attributes

Definition Classes
Source
Enumeration.scala
override def knownSize: Int

Attributes

Returns

The number of elements in this $coll, if it can be cheaply computed, -1 otherwise. Cheaply usually means: Not requiring a collection traversal.

Definition Classes
Source
Enumeration.scala
def map(f: Value => Value): ValueSet

Attributes

Source
Enumeration.scala
override def map[B](f: Value => B)(implicit ev: Ordering[B]): SortedSet[B]

Builds a new sorted collection by applying a function to all elements of this $coll.

Builds a new sorted collection by applying a function to all elements of this $coll.

Type parameters

B

the element type of the returned collection.

Value parameters

f

the function to apply to each element.

Attributes

Returns

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

Definition Classes
Source
Enumeration.scala
def rangeImpl(from: Option[Value], until: Option[Value]): ValueSet

Creates a ranged projection of this collection.

Creates a ranged projection of this collection. Any mutations in the ranged projection will update this collection and vice versa.

Note: keys are not guaranteed to be consistent between this collection and the projection. This is the case for buffers where indexing is relative to the projection.

Value parameters

from

The lower-bound (inclusive) of the ranged projection. None if there is no lower bound.

until

The upper-bound (exclusive) of the ranged projection. None if there is no upper bound.

Attributes

Source
Enumeration.scala
def toBitMask: Array[Long]

Creates a bit mask for the zero-adjusted ids in this set as a new array of longs

Creates a bit mask for the zero-adjusted ids in this set as a new array of longs

Attributes

Source
Enumeration.scala
override def zip[B](that: IterableOnce[B])(implicit ev: Ordering[(Value, B)]): SortedSet[(Value, B)]

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

Returns a $coll formed from this $coll 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.

Type parameters

B

the type of the second half of the returned pairs

Value parameters

that

The iterable providing the second half of each result pair

Attributes

Returns

a new $coll containing pairs consisting of corresponding elements of this $coll and that. The length of the returned collection is the minimum of the lengths of this $coll and that.

Definition Classes
Source
Enumeration.scala

Inherited methods

final def &(that: Set[Value]): C

Alias for intersect

Alias for intersect

Attributes

Inherited from:
SetOps
Source
Set.scala
final def &~(that: Set[Value]): C

Alias for diff

Alias for diff

Attributes

Inherited from:
SetOps
Source
Set.scala
final override def +(elem: Value): C

Alias for incl

Alias for incl

Attributes

Definition Classes
Inherited from:
SetOps
Source
Set.scala
final def ++[B >: Value](suffix: IterableOnce[B]): CC[B]

Alias for concat

Alias for concat

Attributes

Inherited from:
IterableOps
Source
Iterable.scala
final def ++(that: IterableOnce[Value]): C

Alias for concat

Alias for concat

Attributes

Inherited from:
SetOps
Source
Set.scala
final override def -(elem: Value): C

Alias for excl

Alias for excl

Attributes

Definition Classes
Inherited from:
SetOps
Source
Set.scala
final override def --(that: IterableOnce[Value]): C

Alias for removedAll

Alias for removedAll

Attributes

Definition Classes
Inherited from:
SetOps
Source
Set.scala
final def addString(b: StringBuilder): StringBuilder

Appends all elements of this collection to a string builder.

Appends all elements of this collection to a string builder. The written text consists of the string representations (w.r.t. the method toString) of all elements of this collection without any separator string.

Example:

scala> val a = List(1,2,3,4)
a: List[Int] = List(1, 2, 3, 4)

scala> val b = new StringBuilder()
b: StringBuilder =

scala> val h = a.addString(b)
h: StringBuilder = 1234

Value parameters

b

the string builder to which elements are appended.

Attributes

Returns

the string builder b to which elements were appended.

Inherited from:
IterableOnceOps
Source
IterableOnce.scala
final def addString(b: StringBuilder, sep: String): StringBuilder

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

Appends all elements of this collection to a string builder using a separator string. The written text consists of the string representations (w.r.t. the method toString) of all elements of this collection, separated by the string sep.

Example:

scala> val a = List(1,2,3,4)
a: List[Int] = List(1, 2, 3, 4)

scala> val b = new StringBuilder()
b: StringBuilder =

scala> a.addString(b, ", ")
res0: StringBuilder = 1, 2, 3, 4

Value parameters

b

the string builder to which elements are appended.

sep

the separator string.

Attributes

Returns

the string builder b to which elements were appended.

Inherited from:
IterableOnceOps
Source
IterableOnce.scala
def addString(b: StringBuilder, start: String, sep: String, end: String): StringBuilder

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

Appends all elements of this collection to a string builder using start, end, and separator strings. The written text begins with the string start and ends with the string end. Inside, the string representations (w.r.t. the method toString) of all elements of this collection are separated by the string sep.

Example:

scala> val a = List(1,2,3,4)
a: List[Int] = List(1, 2, 3, 4)

scala> val b = new StringBuilder()
b: StringBuilder =

scala> a.addString(b , "List(" , ", " , ")")
res5: StringBuilder = List(1, 2, 3, 4)

Value parameters

b

the string builder to which elements are appended.

end

the ending string.

sep

the separator string.

start

the starting string.

Attributes

Returns

the string builder b to which elements were appended.

Inherited from:
IterableOnceOps
Source
IterableOnce.scala
def andThen[A](g: Boolean => A): T1 => 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.

Type parameters

A

the result type of function g

Value parameters

g

a function R => A

Attributes

Returns

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

Inherited from:
Function1
Source
Function1.scala
final def apply(elem: Value): 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.

Value parameters

elem

the element to test for membership.

Attributes

Returns

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

Inherited from:
SetOps
Source
Set.scala
def canEqual(that: Any): Boolean

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

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

Value parameters

that

the value being probed for possible equality

Attributes

Returns

true if this instance can possibly equal that, otherwise false

Inherited from:
Set
Source
Set.scala
override def collect[B](pf: PartialFunction[Value, B]): CC[B]

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

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

Type parameters

B

the element type of the returned iterable collection.

Value parameters

pf

the partial function which filters and maps the iterable collection.

Attributes

Returns

a new iterable collection resulting from applying the given partial function pf to each element on which it is defined and collecting the results. The order of the elements is preserved.

Definition Classes
Inherited from:
StrictOptimizedIterableOps
Source
StrictOptimizedIterableOps.scala
def collectFirst[B](pf: PartialFunction[Value, B]): Option[B]

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

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

Note: may not terminate for infinite-sized collections.

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

Value parameters

pf

the partial function

Attributes

Returns

an option value containing pf applied to the first value for which it is defined, or None if none exists.

Example

Seq("a", 1, 5L).collectFirst({ case x: Int => x*10 }) = Some(10)

Inherited from:
IterableOnceOps
Source
IterableOnce.scala
def compose[A](g: A => Value): A => R

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.

Type parameters

A

the type to which function g can be applied

Value parameters

g

a function A => T1

Attributes

Returns

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

Inherited from:
Function1
Source
Function1.scala
def concat[B >: Value](suffix: IterableOnce[B]): CC[B]

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

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

Type parameters

B

the element type of the returned collection.

Value parameters

suffix

the iterable to append.

Attributes

Returns

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

Inherited from:
IterableOps
Source
Iterable.scala
def concat(that: IterableOnce[Value]): C

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

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

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

Example:

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

Value parameters

that

the collection containing the elements to add.

Attributes

Returns

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

Inherited from:
SetOps
Source
Set.scala
def copyToArray[B >: Value](xs: Array[B], start: Int, len: Int): Int

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

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

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

Copying will stop once either all the elements of this collection have been copied, or the end of the array is reached, or len elements have been copied.

Type parameters

B

the type of the elements of the array.

Value parameters

len

the maximal number of elements to copy.

start

the starting index of xs.

xs

the array to fill.

Attributes

Returns

the number of elements written to the array

Note

Reuse: After calling this method, one should discard the iterator it was called on. Using it is undefined and subject to change.

Inherited from:
IterableOnceOps
Source
IterableOnce.scala
def copyToArray[B >: Value](xs: Array[B], start: Int): Int

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

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

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

Copying will stop once either all the elements of this collection have been copied, or the end of the array is reached.

Type parameters

B

the type of the elements of the array.

Value parameters

start

the starting index of xs.

xs

the array to fill.

Attributes

Returns

the number of elements written to the array

Note

Reuse: After calling this method, one should discard the iterator it was called on. Using it is undefined and subject to change.

Inherited from:
IterableOnceOps
Source
IterableOnce.scala
def copyToArray[B >: Value](xs: Array[B]): Int

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

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

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

Copying will stop once either all the elements of this collection have been copied, or the end of the array is reached.

Type parameters

B

the type of the elements of the array.

Value parameters

xs

the array to fill.

Attributes

Returns

the number of elements written to the array

Note

Reuse: After calling this method, one should discard the iterator it was called on. Using it is undefined and subject to change.

Inherited from:
IterableOnceOps
Source
IterableOnce.scala
def corresponds[B](that: IterableOnce[B])(p: (Value, B) => Boolean): Boolean

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

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

Note: will not terminate for infinite-sized collections.

Type parameters

B

the type of the elements of that

Value parameters

p

the test predicate, which relates elements from both collections

that

the other collection

Attributes

Returns

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

Inherited from:
IterableOnceOps
Source
IterableOnce.scala
def count(p: Value => Boolean): Int

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

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

Note: will not terminate for infinite-sized collections.

Value parameters

p

the predicate used to test elements.

Attributes

Returns

the number of elements satisfying the predicate p.

Inherited from:
IterableOnceOps
Source
IterableOnce.scala
def diff(that: Set[Value]): C

Computes the difference of this set and another set.

Computes the difference of this set and another set.

Value parameters

that

the set of elements to exclude.

Attributes

Returns

a set containing those elements of this set that are not also contained in the given set that.

Inherited from:
SetOps
Source
Set.scala
def drop(n: Int): C

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.

Value parameters

n

the number of elements to drop from this iterable collection.

Attributes

Returns

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

Inherited from:
IterableOps
Source
Iterable.scala
override def dropRight(n: Int): C

The rest of the collection without its n last elements.

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

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

Attributes

Definition Classes
Inherited from:
StrictOptimizedIterableOps
Source
StrictOptimizedIterableOps.scala
def dropWhile(p: Value => Boolean): C

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.

Value parameters

p

The predicate used to test elements.

Attributes

Returns

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

Inherited from:
IterableOps
Source
Iterable.scala
override def equals(that: Any): Boolean

Equality of sets is implemented using the lookup method contains.

Equality of sets is implemented using the lookup method contains. This method returns true if

  • the argument that is a Set,

  • the two sets have the same size, and

  • for every element this set, other.contains(element) == true.

The implementation of equals checks the canEqual method, so subclasses of Set can narrow down the equality to specific set types. The Set implementations in the standard library can all be compared, their canEqual methods return true.

Note: The equals method only respects the equality laws (symmetry, transitivity) if the two sets use the same element equivalence function in their lookup operation. For example, the element equivalence operation in a scala.collection.immutable.TreeSet is defined by its ordering. Comparing a TreeSet with a HashSet leads to unexpected results if ordering.equiv(e1, e2) (used for lookup in TreeSet) is different from e1 == e2 (used for lookup in HashSet).

scala> import scala.collection.immutable._
scala> val ord: Ordering[String] = _ compareToIgnoreCase _

scala> TreeSet("A")(ord) == HashSet("a")
val res0: Boolean = false

scala> HashSet("a") == TreeSet("A")(ord)
val res1: Boolean = true

Value parameters

that

The set to which this set is compared

Attributes

Returns

true if the two sets are equal according to the description

Definition Classes
SortedSet -> Set -> Equals -> Any
Inherited from:
SortedSet
Source
SortedSet.scala
def exists(p: Value => Boolean): Boolean

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

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

Note: may not terminate for infinite-sized collections.

Value parameters

p

the predicate used to test elements.

Attributes

Returns

true if the given predicate p is satisfied by at least one element of this collection, otherwise false

Inherited from:
IterableOnceOps
Source
IterableOnce.scala
override def filter(pred: Value => Boolean): C

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

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

Value parameters

p

the predicate used to test elements.

Attributes

Returns

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

Definition Classes
Inherited from:
StrictOptimizedIterableOps
Source
StrictOptimizedIterableOps.scala
override def filterNot(pred: Value => Boolean): C

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

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

Value parameters

pred

the predicate used to test elements.

Attributes

Returns

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

Definition Classes
Inherited from:
StrictOptimizedIterableOps
Source
StrictOptimizedIterableOps.scala
def find(p: Value => Boolean): Option[A]

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

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

Note: may not terminate for infinite-sized collections.

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

Value parameters

p

the predicate used to test elements.

Attributes

Returns

an option value containing the first element in the collection that satisfies p, or None if none exists.

Inherited from:
IterableOnceOps
Source
IterableOnce.scala
def firstKey: A

Returns the first key of the collection.

Returns the first key of the collection.

Attributes

Inherited from:
SortedSetOps
Source
SortedSet.scala
override def flatMap[B](f: Value => IterableOnce[B]): CC[B]

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

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

For example:

def getWords(lines: Seq[String]): Seq[String] = lines flatMap (line => line split "\\W+")

The type of the resulting collection is guided by the static type of iterable collection. This might cause unexpected results sometimes. For example:

// lettersOf will return a Seq[Char] of likely repeated letters, instead of a Set
def lettersOf(words: Seq[String]) = words flatMap (word => word.toSet)

// lettersOf will return a Set[Char], not a Seq
def lettersOf(words: Seq[String]) = words.toSet flatMap ((word: String) => word.toSeq)

// xs will be an Iterable[Int]
val xs = Map("a" -> List(11,111), "b" -> List(22,222)).flatMap(_._2)

// ys will be a Map[Int, Int]
val ys = Map("a" -> List(1 -> 11,1 -> 111), "b" -> List(2 -> 22,2 -> 222)).flatMap(_._2)

Type parameters

B

the element type of the returned collection.

Value parameters

f

the function to apply to each element.

Attributes

Returns

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

Definition Classes
Inherited from:
StrictOptimizedIterableOps
Source
StrictOptimizedIterableOps.scala
override def flatten[B](implicit toIterableOnce: Value => IterableOnce[B]): CC[B]

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

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

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

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

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

Type parameters

B

the type of the elements of each iterable collection.

Value parameters

asIterable

an implicit conversion which asserts that the element type of this iterable collection is an Iterable.

Attributes

Returns

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

Definition Classes
Inherited from:
StrictOptimizedIterableOps
Source
StrictOptimizedIterableOps.scala
def fold[A1 >: Value](z: A1)(op: (A1, A1) => A1): A1

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

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

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

Note: will not terminate for infinite-sized collections.

Type parameters

A1

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

Value parameters

op

a binary operator that must be associative.

z

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

Attributes

Returns

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

Inherited from:
IterableOnceOps
Source
IterableOnce.scala
def foldLeft[B](z: B)(op: (B, Value) => B): B

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

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

Note: will not terminate for infinite-sized collections.

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

Type parameters

B

the result type of the binary operator.

Value parameters

op

the binary operator.

z

the start value.

Attributes

Returns

the result of inserting op between consecutive elements of this collection, going left to right with the start value z on the left: op(...op(z, x1), x2, ..., xn) where x1, ..., xn are the elements of this collection. Returns z if this collection is empty.

Inherited from:
IterableOnceOps
Source
IterableOnce.scala
def foldRight[B](z: B)(op: (Value, B) => B): B

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

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

Note: will not terminate for infinite-sized collections.

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

Type parameters

B

the result type of the binary operator.

Value parameters

op

the binary operator.

z

the start value.

Attributes

Returns

the result of inserting op between consecutive elements of this collection, going right to left with the start value z on the right: op(x1, op(x2, ... op(xn, z)...)) where x1, ..., xn are the elements of this collection. Returns z if this collection is empty.

Inherited from:
IterableOnceOps
Source
IterableOnce.scala
def forall(p: Value => Boolean): Boolean

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

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

Note: may not terminate for infinite-sized collections.

Value parameters

p

the predicate used to test elements.

Attributes

Returns

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

Inherited from:
IterableOnceOps
Source
IterableOnce.scala
def foreach[U](f: Value => U): Unit

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

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

Attributes

Inherited from:
IterableOnceOps
Source
IterableOnce.scala
def groupBy[K](f: Value => K): Map[K, C]

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

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

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

Type parameters

K

the type of keys returned by the discriminator function.

Value parameters

f

the discriminator function.

Attributes

Returns

A map from keys to iterable collections such that the following invariant holds:

(xs groupBy f)(k) = xs filter (x => f(x) == k)

That is, every key k is bound to a iterable collection of those elements x for which f(x) equals k.

Inherited from:
IterableOps
Source
Iterable.scala
def groupMap[K, B](key: Value => K)(f: Value => B): Map[K, CC[B]]

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

Partitions this iterable collection into a map of iterable collections according to a discriminator function key. Each element in a group is transformed into a value of type B using the value function.

It is equivalent to groupBy(key).mapValues(_.map(f)), but more efficient.

case class User(name: String, age: Int)

def namesByAge(users: Seq[User]): Map[Int, Seq[String]] =
  users.groupMap(_.age)(_.name)

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

Type parameters

B

the type of values returned by the transformation function

K

the type of keys returned by the discriminator function

Value parameters

f

the element transformation function

key

the discriminator function

Attributes

Inherited from:
IterableOps
Source
Iterable.scala
def groupMapReduce[K, B](key: Value => K)(f: Value => B)(reduce: (B, B) => B): Map[K, B]

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

Partitions this iterable collection into a map according to a discriminator function key. All the values that have the same discriminator are then transformed by the f function and then reduced into a single value with the reduce function.

It is equivalent to groupBy(key).mapValues(_.map(f).reduce(reduce)), but more efficient.

def occurrences[A](as: Seq[A]): Map[A, Int] =
  as.groupMapReduce(identity)(_ => 1)(_ + _)

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

Attributes

Inherited from:
IterableOps
Source
Iterable.scala
def grouped(size: Int): Iterator[C]

Partitions elements in fixed size iterable collections.

Partitions elements in fixed size iterable collections.

Value parameters

size

the number of elements per group

Attributes

Returns

An iterator producing iterable collections of size size, except the last will be less than size size if the elements don't divide evenly.

See also

scala.collection.Iterator, method grouped

Inherited from:
IterableOps
Source
Iterable.scala
override 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) returns false). A degenerate implementation could always return 0. However, it is required that if two objects are equal (o1.equals(o2) returns true) 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 the equals method.

Attributes

Returns

the hash code value for this object.

Definition Classes
Set -> Any
Inherited from:
Set
Source
Set.scala
def head: A

Selects the first element of this iterable collection.

Selects the first element of this iterable collection.

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

Attributes

Returns

the first element of this iterable collection.

Throws

NoSuchElementException if the iterable collection is empty.

Inherited from:
IterableOps
Source
Iterable.scala
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.

Attributes

Returns

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

Inherited from:
IterableOps
Source
Iterable.scala
def init: C

The initial part of the collection without its last element.

The initial part of the collection without its last element.

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

Attributes

Inherited from:
IterableOps
Source
Iterable.scala
def inits: Iterator[C]

Iterates over the inits of this iterable collection.

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

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

Attributes

Returns

an iterator over all the inits of this iterable collection

Example

List(1,2,3).inits = Iterator(List(1,2,3), List(1,2), List(1), Nil)

Inherited from:
IterableOps
Source
Iterable.scala
def intersect(that: Set[Value]): C

Computes the intersection between this set and another set.

Computes the intersection between this set and another set.

Value parameters

that

the set to intersect with.

Attributes

Returns

a new set consisting of all elements that are both in this set and in the given set that.

Inherited from:
SetOps
Source
Set.scala
override def isTraversableAgain: Boolean

Tests whether this iterable collection can be repeatedly traversed.

Tests whether this iterable collection can be repeatedly traversed. Always true for Iterables and false for Iterators unless overridden.

Attributes

Returns

true if it is repeatedly traversable, false otherwise.

Definition Classes
Inherited from:
IterableOps
Source
Iterable.scala
override def iterableFactory: IterableFactory[Set]

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

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

Attributes

Note

When implementing a custom collection type and refining CC to the new type, this method needs to be overridden to return a factory for the new type (the compiler will issue an error otherwise).

Definition Classes
Inherited from:
Set
Source
Set.scala
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.

Attributes

Returns

The last element of this iterable collection.

Throws

NoSuchElementException If the iterable collection is empty.

Inherited from:
IterableOps
Source
Iterable.scala
def lastKey: A

Returns the last key of the collection.

Returns the last key of the collection.

Attributes

Inherited from:
SortedSetOps
Source
SortedSet.scala
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.

Attributes

Returns

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

Inherited from:
IterableOps
Source
Iterable.scala
def lazyZip[B](that: Iterable[B]): LazyZip2[A, B, Iterable]

Analogous to zip except that the elements in each collection are not consumed until a strict operation is invoked on the returned LazyZip2 decorator.

Analogous to zip except that the elements in each collection are not consumed until a strict operation is invoked on the returned LazyZip2 decorator.

Calls to lazyZip can be chained to support higher arities (up to 4) without incurring the expense of constructing and deconstructing intermediary tuples.

val xs = List(1, 2, 3)
val res = (xs lazyZip xs lazyZip xs lazyZip xs).map((a, b, c, d) => a + b + c + d)
// res == List(4, 8, 12)

Type parameters

B

the type of the second element in each eventual pair

Value parameters

that

the iterable providing the second element of each eventual pair

Attributes

Returns

a decorator LazyZip2 that allows strict operations to be performed on the lazily evaluated pairs or chained calls to lazyZip. Implicit conversion to Iterable[(A, B)] is also supported.

Inherited from:
Iterable
Source
Iterable.scala
override def map[B](f: Value => B): CC[B]

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

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

Type parameters

B

the element type of the returned iterable collection.

Value parameters

f

the function to apply to each element.

Attributes

Returns

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

Definition Classes
Inherited from:
StrictOptimizedIterableOps
Source
StrictOptimizedIterableOps.scala
override def max[B >: Value](implicit ord: Ordering[B]): A

Finds the largest element.

Finds the largest element.

Note: will not terminate for infinite-sized collections.

Type parameters

B

The type over which the ordering is defined.

Value parameters

ord

An ordering to be used for comparing elements.

Attributes

Returns

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

Throws

UnsupportedOperationException if this set is empty.

Definition Classes
Inherited from:
SortedSetOps
Source
SortedSet.scala
def maxBefore(key: Value): Option[A]

Find the largest element less than a given key.

Find the largest element less than a given key.

Value parameters

key

The given key.

Attributes

Returns

None if there is no such node.

Inherited from:
SortedSetOps
Source
SortedSet.scala
def maxBy[B](f: Value => B)(implicit cmp: Ordering[B]): A

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

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

Note: will not terminate for infinite-sized collections.

Type parameters

B

The result type of the function f.

Value parameters

cmp

An ordering to be used for comparing elements.

f

The measuring function.

Attributes

Returns

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

Throws

UnsupportedOperationException if this collection is empty.

Inherited from:
IterableOnceOps
Source
IterableOnce.scala
def maxByOption[B](f: Value => B)(implicit cmp: Ordering[B]): Option[A]

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

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

Note: will not terminate for infinite-sized collections.

Type parameters

B

The result type of the function f.

Value parameters

cmp

An ordering to be used for comparing elements.

f

The measuring function.

Attributes

Returns

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

Inherited from:
IterableOnceOps
Source
IterableOnce.scala
def maxOption[B >: Value](implicit ord: Ordering[B]): Option[A]

Finds the largest element.

Finds the largest element.

Note: will not terminate for infinite-sized collections.

Type parameters

B

The type over which the ordering is defined.

Value parameters

ord

An ordering to be used for comparing elements.

Attributes

Returns

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

Inherited from:
IterableOnceOps
Source
IterableOnce.scala
override def min[B >: Value](implicit ord: Ordering[B]): A

Finds the smallest element.

Finds the smallest element.

Note: will not terminate for infinite-sized collections.

Type parameters

B

The type over which the ordering is defined.

Value parameters

ord

An ordering to be used for comparing elements.

Attributes

Returns

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

Throws

UnsupportedOperationException if this set is empty.

Definition Classes
Inherited from:
SortedSetOps
Source
SortedSet.scala
def minAfter(key: Value): Option[A]

Find the smallest element larger than or equal to a given key.

Find the smallest element larger than or equal to a given key.

Value parameters

key

The given key.

Attributes

Returns

None if there is no such node.

Inherited from:
SortedSetOps
Source
SortedSet.scala
def minBy[B](f: Value => B)(implicit cmp: Ordering[B]): A

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

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

Note: will not terminate for infinite-sized collections.

Type parameters

B

The result type of the function f.

Value parameters

cmp

An ordering to be used for comparing elements.

f

The measuring function.

Attributes

Returns

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

Throws

UnsupportedOperationException if this collection is empty.

Inherited from:
IterableOnceOps
Source
IterableOnce.scala
def minByOption[B](f: Value => B)(implicit cmp: Ordering[B]): Option[A]

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

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

Note: will not terminate for infinite-sized collections.

Type parameters

B

The result type of the function f.

Value parameters

cmp

An ordering to be used for comparing elements.

f

The measuring function.

Attributes

Returns

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

Inherited from:
IterableOnceOps
Source
IterableOnce.scala
def minOption[B >: Value](implicit ord: Ordering[B]): Option[A]

Finds the smallest element.

Finds the smallest element.

Note: will not terminate for infinite-sized collections.

Type parameters

B

The type over which the ordering is defined.

Value parameters

ord

An ordering to be used for comparing elements.

Attributes

Returns

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

Inherited from:
IterableOnceOps
Source
IterableOnce.scala
final def mkString: String

Displays all elements of this collection in a string.

Displays all elements of this collection in a string.

Delegates to addString, which can be overridden.

Attributes

Returns

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

Inherited from:
IterableOnceOps
Source
IterableOnce.scala
final def mkString(sep: String): String

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

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

Delegates to addString, which can be overridden.

Value parameters

sep

the separator string.

Attributes

Returns

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

Example

List(1, 2, 3).mkString("|") = "1|2|3"

Inherited from:
IterableOnceOps
Source
IterableOnce.scala
final def mkString(start: String, sep: String, end: String): String

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

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

Delegates to addString, which can be overridden.

Value parameters

end

the ending string.

sep

the separator string.

start

the starting string.

Attributes

Returns

a string representation of this collection. The resulting string begins with the string start and ends with the string end. Inside, the string representations (w.r.t. the method toString) of all elements of this collection are separated by the string sep.

Example

List(1, 2, 3).mkString("(", "; ", ")") = "(1; 2; 3)"

Inherited from:
IterableOnceOps
Source
IterableOnce.scala
def nonEmpty: Boolean

Tests whether the collection is not empty.

Tests whether the collection is not empty.

Attributes

Returns

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

Inherited from:
IterableOnceOps
Source
IterableOnce.scala
override def partition(p: Value => Boolean): (C, C)

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

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

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

Attributes

Definition Classes
Inherited from:
StrictOptimizedIterableOps
Source
StrictOptimizedIterableOps.scala
override def partitionMap[A1, A2](f: Value => Either[A1, A2]): (CC[A1], CC[A2])

Applies a function f to each element of the iterable collection and returns a pair of iterable collections: the first one made of those values returned by f that were wrapped in scala.util.Left, and the second one made of those wrapped in scala.util.Right.

Applies a function f to each element of the iterable collection and returns a pair of iterable collections: the first one made of those values returned by f that were wrapped in scala.util.Left, and the second one made of those wrapped in scala.util.Right.

Example:

val xs = Iterable(1, "one", 2, "two", 3, "three") partitionMap {
 case i: Int => Left(i)
 case s: String => Right(s)
}
// xs == (Iterable(1, 2, 3),
//        Iterable(one, two, three))

Type parameters

A1

the element type of the first resulting collection

A2

the element type of the second resulting collection

Value parameters

f

the 'split function' mapping the elements of this iterable collection to an scala.util.Either

Attributes

Returns

a pair of iterable collections: the first one made of those values returned by f that were wrapped in scala.util.Left, and the second one made of those wrapped in scala.util.Right.

Definition Classes
Inherited from:
StrictOptimizedIterableOps
Source
StrictOptimizedIterableOps.scala
def product[B >: Value](implicit num: Numeric[B]): B

Multiplies up the elements of this collection.

Multiplies up the elements of this collection.

Note: will not terminate for infinite-sized collections.

Type parameters

B

the result type of the * operator.

Value parameters

num

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

Attributes

Returns

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

Inherited from:
IterableOnceOps
Source
IterableOnce.scala
def range(from: Value, until: Value): C

Creates a ranged projection of this collection with both a lower-bound and an upper-bound.

Creates a ranged projection of this collection with both a lower-bound and an upper-bound.

Value parameters

from

The lower-bound (inclusive) of the ranged projection.

until

The upper-bound (exclusive) of the ranged projection.

Attributes

Inherited from:
SortedOps
Source
SortedOps.scala
def rangeFrom(from: Value): C

Creates a ranged projection of this collection with no upper-bound.

Creates a ranged projection of this collection with no upper-bound.

Value parameters

from

The lower-bound (inclusive) of the ranged projection.

Attributes

Inherited from:
SortedOps
Source
SortedOps.scala
def rangeTo(to: Value): C

Create a range projection of this collection with no lower-bound.

Create a range projection of this collection with no lower-bound.

Value parameters

to

The upper-bound (inclusive) of the ranged projection.

Attributes

Inherited from:
SortedSetOps
Source
SortedSet.scala
def rangeUntil(until: Value): C

Creates a ranged projection of this collection with no lower-bound.

Creates a ranged projection of this collection with no lower-bound.

Value parameters

until

The upper-bound (exclusive) of the ranged projection.

Attributes

Inherited from:
SortedOps
Source
SortedOps.scala
def reduce[B >: Value](op: (B, B) => B): B

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

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

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

Type parameters

B

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

Value parameters

op

A binary operator that must be associative.

Attributes

Returns

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

Throws

UnsupportedOperationException if this collection is empty.

Inherited from:
IterableOnceOps
Source
IterableOnce.scala
def reduceLeft[B >: Value](op: (B, Value) => B): B

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

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

Note: will not terminate for infinite-sized collections.

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

Type parameters

B

the result type of the binary operator.

Value parameters

op

the binary operator.

Attributes

Returns

the result of inserting op between consecutive elements of this collection, going left to right: op( op( ... op(x1, x2) ..., xn-1), xn) where x1, ..., xn are the elements of this collection.

Throws

UnsupportedOperationException if this collection is empty.

Inherited from:
IterableOnceOps
Source
IterableOnce.scala
def reduceLeftOption[B >: Value](op: (B, Value) => B): Option[B]

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

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

Note: will not terminate for infinite-sized collections.

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

Type parameters

B

the result type of the binary operator.

Value parameters

op

the binary operator.

Attributes

Returns

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

Inherited from:
IterableOnceOps
Source
IterableOnce.scala
def reduceOption[B >: Value](op: (B, B) => B): Option[B]

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

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

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

Type parameters

B

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

Value parameters

op

A binary operator that must be associative.

Attributes

Returns

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

Inherited from:
IterableOnceOps
Source
IterableOnce.scala
def reduceRight[B >: Value](op: (Value, B) => B): B

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

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

Note: will not terminate for infinite-sized collections.

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

Type parameters

B

the result type of the binary operator.

Value parameters

op

the binary operator.

Attributes

Returns

the result of inserting op between consecutive elements of this collection, going right to left: op(x1, op(x2, ..., op(xn-1, xn)...)) where x1, ..., xn are the elements of this collection.

Throws

UnsupportedOperationException if this collection is empty.

Inherited from:
IterableOnceOps
Source
IterableOnce.scala
def reduceRightOption[B >: Value](op: (Value, B) => B): Option[B]

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

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

Note: will not terminate for infinite-sized collections.

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

Type parameters

B

the result type of the binary operator.

Value parameters

op

the binary operator.

Attributes

Returns

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

Inherited from:
IterableOnceOps
Source
IterableOnce.scala
def removedAll(that: IterableOnce[Value]): C

Creates a new immutable set from this immutable set by removing all elements of another collection.

Creates a new immutable set from this immutable set by removing all elements of another collection.

Value parameters

that

the collection containing the elements to remove.

Attributes

Returns

a new immutable set with the given elements removed, omitting duplicates.

Inherited from:
SetOps
Source
Set.scala
protected def reversed: Iterable[A]

Attributes

Inherited from:
IterableOnceOps
Source
IterableOnce.scala
def scan[B >: Value](z: B)(op: (B, B) => B): CC[B]

Computes a prefix scan of the elements of the collection.

Computes a prefix scan of the elements of the collection.

Note: The neutral element z may be applied more than once.

Type parameters

B

element type of the resulting collection

Value parameters

op

the associative operator for the scan

z

neutral element for the operator op

Attributes

Returns

a new iterable collection containing the prefix scan of the elements in this iterable collection

Inherited from:
IterableOps
Source
Iterable.scala
override def scanLeft[B](z: B)(op: (B, Value) => B): CC[B]

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

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

Note: will not terminate for infinite-sized collections.

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

Type parameters

B

the type of the elements in the resulting collection

Value parameters

op

the binary operator applied to the intermediate result and the element

z

the initial value

Attributes

Returns

collection with intermediate results

Definition Classes
Inherited from:
StrictOptimizedIterableOps
Source
StrictOptimizedIterableOps.scala
def scanRight[B](z: B)(op: (Value, B) => B): CC[B]

Produces a collection containing cumulative results of applying the operator going right to left.

Produces a collection containing cumulative results of applying the operator going right to left. The head of the collection is the last cumulative result.

Note: will not terminate for infinite-sized collections.

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

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

Example:

List(1, 2, 3, 4).scanRight(0)(_ + _) == List(10, 9, 7, 4, 0)

Type parameters

B

the type of the elements in the resulting collection

Value parameters

op

the binary operator applied to the intermediate result and the element

z

the initial value

Attributes

Returns

collection with intermediate results

Inherited from:
IterableOps
Source
Iterable.scala
def size: Int

The size of this collection.

The size of this collection.

Note: will not terminate for infinite-sized collections.

Attributes

Returns

the number of elements in this collection.

Inherited from:
IterableOnceOps
Source
IterableOnce.scala
def sizeCompare(that: Iterable[_]): Int

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

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

Value parameters

that

the Iterable whose size is compared with this iterable collection's size.

Attributes

Returns

A value x where

x <  0       if this.size <  that.size
x == 0       if this.size == that.size
x >  0       if this.size >  that.size

The method as implemented here does not call size directly; its running time is O(this.size min that.size) instead of O(this.size + that.size). The method should be overridden if computing size is cheap and knownSize returns -1.

Inherited from:
IterableOps
Source
Iterable.scala
def sizeCompare(otherSize: Int): Int

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

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

Value parameters

otherSize

the test value that gets compared with the size.

Attributes

Returns

A value x where

x <  0       if this.size <  otherSize
x == 0       if this.size == otherSize
x >  0       if this.size >  otherSize

The method as implemented here does not call size directly; its running time is O(size min otherSize) instead of O(size). The method should be overridden if computing size is cheap and knownSize returns -1.

See also
Inherited from:
IterableOps
Source
Iterable.scala
final def sizeIs: SizeCompareOps

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

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

These operations are implemented in terms of sizeCompare(Int), and allow the following more readable usages:

this.sizeIs < size     // this.sizeCompare(size) < 0
this.sizeIs <= size    // this.sizeCompare(size) <= 0
this.sizeIs == size    // this.sizeCompare(size) == 0
this.sizeIs != size    // this.sizeCompare(size) != 0
this.sizeIs >= size    // this.sizeCompare(size) >= 0
this.sizeIs > size     // this.sizeCompare(size) > 0

Attributes

Inherited from:
IterableOps
Source
Iterable.scala
def slice(from: Int, until: Int): C

Selects an interval of elements.

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

from <= indexOf(x) < until

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

Value parameters

from

the lowest index to include from this iterable collection.

until

the lowest index to EXCLUDE from this iterable collection.

Attributes

Returns

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

Inherited from:
IterableOps
Source
Iterable.scala
def sliding(size: Int, step: Int): Iterator[C]

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

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

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

Value parameters

size

the number of elements per group

step

the distance between the first elements of successive groups

Attributes

Returns

An iterator producing iterable collections of size size, except the last element (which may be the only element) will be smaller if there are fewer than size elements remaining to be grouped.

See also

scala.collection.Iterator, method sliding

Example

List(1, 2, 3, 4, 5).sliding(2, 2) = Iterator(List(1, 2), List(3, 4), List(5))

List(1, 2, 3, 4, 5, 6).sliding(2, 3) = Iterator(List(1, 2), List(4, 5))

Inherited from:
IterableOps
Source
Iterable.scala
def sliding(size: Int): Iterator[C]

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

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

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

Value parameters

size

the number of elements per group

Attributes

Returns

An iterator producing iterable collections of size size, except for a non-empty collection with less than size elements, which returns an iterator that produces the source collection itself as its only element.

See also

scala.collection.Iterator, method sliding

Example

List().sliding(2) = empty iterator

List(1).sliding(2) = Iterator(List(1))

List(1, 2).sliding(2) = Iterator(List(1, 2))

List(1, 2, 3).sliding(2) = Iterator(List(1, 2), List(2, 3))

Inherited from:
IterableOps
Source
Iterable.scala
override def sortedIterableFactory: SortedIterableFactory[SortedSet]

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

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

Attributes

Note

When implementing a custom collection type and refining CC to the new type, this method needs to be overridden to return a factory for the new type (the compiler will issue an error otherwise).

Definition Classes
Inherited from:
SortedSet
Source
SortedSet.scala
override def span(p: Value => Boolean): (C, C)

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

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

Note: c span p is equivalent to (but possibly more efficient than) (c takeWhile p, c dropWhile p), provided the evaluation of the predicate p does not cause any side-effects.

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

Value parameters

p

the test predicate

Attributes

Returns

a pair consisting of the longest prefix of this iterable collection whose elements all satisfy p, and the rest of this iterable collection.

Definition Classes
Inherited from:
StrictOptimizedIterableOps
Source
StrictOptimizedIterableOps.scala
override def splitAt(n: Int): (C, C)

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

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

Note: c splitAt n is equivalent to (but possibly more efficient than) (c take n, c drop n).

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

Value parameters

n

the position at which to split.

Attributes

Returns

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

Definition Classes
Inherited from:
IterableOps
Source
Iterable.scala
def stepper[S <: Stepper[_]](implicit shape: StepperShape[Value, S]): S

Returns a scala.collection.Stepper for the elements of this collection.

Returns a scala.collection.Stepper for the elements of this collection.

The Stepper enables creating a Java stream to operate on the collection, see scala.jdk.StreamConverters. For collections holding primitive values, the Stepper can be used as an iterator which doesn't box the elements.

The implicit scala.collection.StepperShape parameter defines the resulting Stepper type according to the element type of this collection.

Note that this method is overridden in subclasses and the return type is refined to S with EfficientSplit, for example scala.collection.IndexedSeqOps.stepper. For Steppers marked with scala.collection.Stepper.EfficientSplit, the converters in scala.jdk.StreamConverters allow creating parallel streams, whereas bare Steppers can be converted only to sequential streams.

Attributes

Inherited from:
IterableOnce
Source
IterableOnce.scala
def subsetOf(that: Set[Value]): Boolean

Tests whether this set is a subset of another set.

Tests whether this set is a subset of another set.

Value parameters

that

the set to test.

Attributes

Returns

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

Inherited from:
SetOps
Source
Set.scala
def subsets(): Iterator[C]

An iterator over all subsets of this set.

An iterator over all subsets of this set.

Attributes

Returns

the iterator.

Inherited from:
SetOps
Source
Set.scala
def subsets(len: Int): Iterator[C]

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.

Value parameters

len

the size of the subsets.

Attributes

Returns

the iterator.

Inherited from:
SetOps
Source
Set.scala
def sum[B >: Value](implicit num: Numeric[B]): B

Sums up the elements of this collection.

Sums up the elements of this collection.

Note: will not terminate for infinite-sized collections.

Type parameters

B

the result type of the + operator.

Value parameters

num

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

Attributes

Returns

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

Inherited from:
IterableOnceOps
Source
IterableOnce.scala
def tail: C

The rest of the collection without its first element.

The rest of the collection without its first element.

Attributes

Inherited from:
IterableOps
Source
Iterable.scala
def tails: Iterator[C]

Iterates over the tails of this iterable collection.

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

Attributes

Returns

an iterator over all the tails of this iterable collection

Example

List(1,2,3).tails = Iterator(List(1,2,3), List(2,3), List(3), Nil)

Inherited from:
IterableOps
Source
Iterable.scala
def take(n: Int): C

Selects the first n elements.

Selects the first n elements.

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

Value parameters

n

the number of elements to take from this iterable collection.

Attributes

Returns

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

Inherited from:
IterableOps
Source
Iterable.scala
override def takeRight(n: Int): C

A collection containing the last n elements of this collection.

A collection containing the last n elements of this collection.

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

Attributes

Definition Classes
Inherited from:
StrictOptimizedIterableOps
Source
StrictOptimizedIterableOps.scala
def takeWhile(p: Value => Boolean): C

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.

Value parameters

p

The predicate used to test elements.

Attributes

Returns

the longest prefix of this iterable collection whose elements all satisfy the predicate p.

Inherited from:
IterableOps
Source
Iterable.scala
override def tapEach[U](f: Value => U): C

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

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

Type parameters

U

the return type of f

Value parameters

f

a function to apply to each element in this iterable collection

Attributes

Returns

The same logical collection as this

Definition Classes
Inherited from:
StrictOptimizedIterableOps
Source
StrictOptimizedIterableOps.scala
def to[C1](factory: Factory[Value, C1]): C1

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

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

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

Attributes

Inherited from:
IterableOnceOps
Source
IterableOnce.scala
def toArray[B >: Value : ClassTag]: Array[B]

Convert collection to array.

Convert collection to array.

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

Attributes

Inherited from:
IterableOnceOps
Source
IterableOnce.scala
final def toBuffer[B >: Value]: Buffer[B]

Attributes

Inherited from:
IterableOnceOps
Source
IterableOnce.scala
def toIndexedSeq: IndexedSeq[A]

Attributes

Inherited from:
IterableOnceOps
Source
IterableOnce.scala
def toList: List[A]

Attributes

Inherited from:
IterableOnceOps
Source
IterableOnce.scala
def toMap[K, V](implicit ev: Value <:< (K, V)): Map[K, V]

Attributes

Inherited from:
IterableOnceOps
Source
IterableOnce.scala
def toSeq: Seq[A]

Attributes

Returns

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

Inherited from:
IterableOnceOps
Source
IterableOnce.scala
def toSet[B >: Value]: Set[B]

Attributes

Inherited from:
IterableOnceOps
Source
IterableOnce.scala
override def toString(): String

Returns a string representation of the object.

Returns a string representation of the object.

The default representation is platform dependent.

Attributes

Returns

a string representation of the object.

Definition Classes
Inherited from:
Set
Source
Set.scala
def toVector: Vector[A]

Attributes

Inherited from:
IterableOnceOps
Source
IterableOnce.scala
def transpose[B](implicit asIterable: Value => Iterable[B]): CC[CC[B]]

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

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

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

val xs = List(
           Set(1, 2, 3),
           Set(4, 5, 6)).transpose
// xs == List(
//         List(1, 4),
//         List(2, 5),
//         List(3, 6))

val ys = Vector(
           List(1, 2, 3),
           List(4, 5, 6)).transpose
// ys == Vector(
//         Vector(1, 4),
//         Vector(2, 5),
//         Vector(3, 6))

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

Type parameters

B

the type of the elements of each iterable collection.

Value parameters

asIterable

an implicit conversion which asserts that the element type of this iterable collection is an Iterable.

Attributes

Returns

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

Throws

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

Inherited from:
IterableOps
Source
Iterable.scala
final def union(that: Set[Value]): C

Computes the union between of set and another set.

Computes the union between of set and another set.

Value parameters

that

the set to form the union with.

Attributes

Returns

a new set consisting of all elements that are in this set or in the given set that.

Inherited from:
SetOps
Source
Set.scala
override def unsorted: Set[A]

Attributes

Definition Classes
Inherited from:
SortedSet
Source
SortedSet.scala
override def unzip[A1, A2](implicit asPair: Value => (A1, A2)): (CC[A1], CC[A2])

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

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

val xs = $Coll(
           (1, "one"),
           (2, "two"),
           (3, "three")).unzip
// xs == ($Coll(1, 2, 3),
//        $Coll(one, two, three))

Type parameters

A1

the type of the first half of the element pairs

A2

the type of the second half of the element pairs

Value parameters

asPair

an implicit conversion which asserts that the element type of this collection is a pair.

Attributes

Returns

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

Definition Classes
Inherited from:
StrictOptimizedIterableOps
Source
StrictOptimizedIterableOps.scala
override def unzip3[A1, A2, A3](implicit asTriple: Value => (A1, A2, A3)): (CC[A1], CC[A2], CC[A3])

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

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

val xs = Iterable(
           (1, "one", '1'),
           (2, "two", '2'),
           (3, "three", '3')).unzip3
// xs == (Iterable(1, 2, 3),
//        Iterable(one, two, three),
//        Iterable(1, 2, 3))

Type parameters

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

Value parameters

asTriple

an implicit conversion which asserts that the element type of this iterable collection is a triple.

Attributes

Returns

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

Definition Classes
Inherited from:
StrictOptimizedIterableOps
Source
StrictOptimizedIterableOps.scala
def view: View[A]

A view over the elements of this collection.

A view over the elements of this collection.

Attributes

Inherited from:
IterableOps
Source
Iterable.scala
override def withFilter(p: Value => Boolean): WithFilter[A, WithFilterCC, CC]

Creates a non-strict filter of this set.

Creates a non-strict filter of this set.

Note: the difference between c filter p and c withFilter p is that the former creates a new collection, whereas the latter only restricts the domain of subsequent map, flatMap, foreach, and withFilter operations.

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

Value parameters

p

the predicate used to test elements.

Attributes

Returns

an object of class WithFilter, which supports map, flatMap, foreach, and withFilter operations. All these operations apply to those elements of this set which satisfy the predicate p.

Definition Classes
Inherited from:
SortedSetFactoryDefaults
Source
Iterable.scala
override def zip[B](that: IterableOnce[B]): CC[(A, B)]

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

Returns a iterable collection formed from this iterable collection and another iterable collection by combining corresponding elements in pairs. If one of the two collections is longer than the other, its remaining elements are ignored.

Type parameters

B

the type of the second half of the returned pairs

Value parameters

that

The iterable providing the second half of each result pair

Attributes

Returns

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

Definition Classes
Inherited from:
StrictOptimizedIterableOps
Source
StrictOptimizedIterableOps.scala
def zipAll[A1 >: Value, B](that: Iterable[B], thisElem: A1, thatElem: B): CC[(A1, B)]

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

Returns a iterable collection formed from this iterable collection and another iterable collection by combining corresponding elements in pairs. If one of the two collections is shorter than the other, placeholder elements are used to extend the shorter collection to the length of the longer.

Value parameters

that

the iterable providing the second half of each result pair

thatElem

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

thisElem

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

Attributes

Returns

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

Inherited from:
IterableOps
Source
Iterable.scala
override def zipWithIndex: CC[(A, Int)]

Zips this iterable collection with its indices.

Zips this iterable collection with its indices.

Attributes

Returns

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

Example

List("a", "b", "c").zipWithIndex == List(("a", 0), ("b", 1), ("c", 2))

Definition Classes
Inherited from:
StrictOptimizedIterableOps
Source
StrictOptimizedIterableOps.scala
final def |(that: Set[Value]): C

Alias for union

Alias for union

Attributes

Inherited from:
SetOps
Source
Set.scala

Deprecated and Inherited methods

def +(elem1: Value, elem2: Value, elems: Value*): C

Attributes

Deprecated
true
Inherited from:
SetOps
Source
Set.scala
def ++:[B >: Value](that: IterableOnce[B]): CC[B]

Attributes

Deprecated
true
Inherited from:
IterableOps
Source
Iterable.scala
def -(elem1: Value, elem2: Value, elems: Value*): C

Attributes

Deprecated
true
Inherited from:
SetOps
Source
Set.scala
final def /:[B](z: B)(op: (B, Value) => B): B

Attributes

Deprecated
true
Inherited from:
IterableOnceOps
Source
IterableOnce.scala
final def :\[B](z: B)(op: (Value, B) => B): B

Attributes

Deprecated
true
Inherited from:
IterableOnceOps
Source
IterableOnce.scala
def aggregate[B](z: => B)(seqop: (B, Value) => B, combop: (B, B) => B): B

Attributes

Deprecated
true
Inherited from:
IterableOnceOps
Source
IterableOnce.scala
def companion: IterableFactory[CC]

Attributes

Deprecated
true
Inherited from:
IterableOps
Source
Iterable.scala
def compare(k0: Value, k1: Value): Int

Comparison function that orders keys.

Comparison function that orders keys.

Attributes

Deprecated
true
Inherited from:
SortedOps
Source
SortedOps.scala
final def copyToBuffer[B >: Value](dest: Buffer[B]): Unit

Attributes

Deprecated
true
Inherited from:
IterableOnceOps
Source
IterableOnce.scala
final def from(from: Value): C

Creates a ranged projection of this collection with no upper-bound.

Creates a ranged projection of this collection with no upper-bound.

Value parameters

from

The lower-bound (inclusive) of the ranged projection.

Attributes

Deprecated
true
Inherited from:
SortedOps
Source
SortedOps.scala
def hasDefiniteSize: Boolean

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

Tests whether this collection is known to have a finite size. All strict collections are known to have finite size. For a non-strict collection such as Stream, the predicate returns true if all elements have been computed. It returns false if the stream is not yet evaluated to the end. Non-empty Iterators usually return false even if they were created from a collection with a known finite size.

Note: many collection methods will not work on collections of infinite sizes. The typical failure mode is an infinite loop. These methods always attempt a traversal without checking first that hasDefiniteSize returns true. However, checking hasDefiniteSize can provide an assurance that size is well-defined and non-termination is not a concern.

Attributes

Returns

true if this collection is known to have finite size, false otherwise.

See also

method knownSize for a more useful alternative

Deprecated

This method is deprecated in 2.13 because it does not provide any actionable information. As noted above, even the collection library itself does not use it. When there is no guarantee that a collection is finite, it is generally best to attempt a computation anyway and document that it will not terminate for infinite collections rather than backing out because this would prevent performing the computation on collections that are in fact finite even though hasDefiniteSize returns false.

Inherited from:
IterableOnceOps
Source
IterableOnce.scala
def keysIteratorFrom(start: Value): Iterator[A]

Attributes

Deprecated
true
Inherited from:
SortedSetOps
Source
SortedSet.scala
final def repr: C

Attributes

Deprecated
true
Inherited from:
IterableOps
Source
Iterable.scala
def seq: Iterable.this.type

Attributes

Deprecated
true
Inherited from:
Iterable
Source
Iterable.scala
final def to(to: Value): C

Create a range projection of this collection with no lower-bound.

Create a range projection of this collection with no lower-bound.

Value parameters

to

The upper-bound (inclusive) of the ranged projection.

Attributes

Deprecated
true
Inherited from:
SortedOps
Source
SortedOps.scala
final def toIterable: Iterable.this.type

Attributes

Returns

This collection as an Iterable[A]. No new collection will be built if this is already an Iterable[A].

Deprecated
true
Inherited from:
Iterable
Source
Iterable.scala
final def toIterator: Iterator[A]

Attributes

Deprecated
true
Inherited from:
IterableOnceOps
Source
IterableOnce.scala
final def toStream: Stream[A]

Attributes

Deprecated
true
Inherited from:
IterableOnceOps
Source
IterableOnce.scala
final def toTraversable: Iterable[A]

Converts this iterable collection to an unspecified Iterable.

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

Attributes

Returns

An Iterable containing all elements of this iterable collection.

Deprecated
true
Inherited from:
IterableOps
Source
Iterable.scala
final def until(until: Value): C

Creates a ranged projection of this collection with no lower-bound.

Creates a ranged projection of this collection with no lower-bound.

Value parameters

until

The upper-bound (exclusive) of the ranged projection.

Attributes

Deprecated
true
Inherited from:
SortedOps
Source
SortedOps.scala
def view(from: Int, until: Int): View[A]

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

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

Attributes

Deprecated
true
Inherited from:
IterableOps
Source
Iterable.scala

Implicits

Implicits

implicit def ordering: Ordering[Value]

Attributes

Source
Enumeration.scala
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Copyright (c) 2002-2023, LAMP/EPFL