Scala 3/scala.collection.mutable

scala.collection.mutable

package scala.collection.mutable

Type members

Classlikes

abstract class AbstractBuffer[A] extends AbstractSeq[A] with Buffer[A]

Explicit instantiation of the Buffer trait to reduce class file size in subclasses.

Explicit instantiation of the Buffer trait to reduce class file size in subclasses.

Source:
Buffer.scala
abstract class AbstractIterable[A] extends AbstractIterable[A] with Iterable[A]

Explicit instantiation of the Iterable trait to reduce class file size in subclasses.

Explicit instantiation of the Iterable trait to reduce class file size in subclasses.

Source:
Iterable.scala
abstract class AbstractMap[K, V] extends AbstractMap[K, V] with Map[K, V]

Explicit instantiation of the Map trait to reduce class file size in subclasses.

Explicit instantiation of the Map trait to reduce class file size in subclasses.

Source:
Map.scala
abstract class AbstractSeq[A] extends AbstractSeq[A] with Seq[A]

Explicit instantiation of the Seq trait to reduce class file size in subclasses.

Explicit instantiation of the Seq trait to reduce class file size in subclasses.

Source:
Seq.scala
abstract class AbstractSet[A] extends AbstractSet[A] with Set[A]

Explicit instantiation of the Set trait to reduce class file size in subclasses.

Explicit instantiation of the Set trait to reduce class file size in subclasses.

Source:
Set.scala
class AnyRefMap[K <: AnyRef, V] extends AbstractMap[K, V] with MapOps[K, V, Map, AnyRefMap[K, V]] with StrictOptimizedIterableOps[(K, V), Iterable, AnyRefMap[K, V]] with Serializable

This class implements mutable maps with AnyRef keys based on a hash table with open addressing.

This class implements mutable maps with AnyRef keys based on a hash table with open addressing.

Basic map operations on single entries, including contains and get, are typically significantly faster with AnyRefMap than HashMap. Note that numbers and characters are not handled specially in AnyRefMap; only plain equals and hashCode are used in comparisons.

Methods that traverse or regenerate the map, including foreach and map, are not in general faster than with HashMap. The methods foreachKey, foreachValue, mapValuesNow, and transformValues are, however, faster than alternative ways to achieve the same functionality.

Maps with open addressing may become less efficient at lookup after repeated addition/removal of elements. Although AnyRefMap makes a decent attempt to remain efficient regardless, calling repack on a map that will no longer have elements removed but will be used heavily may save both time and storage space.

This map is not intended to contain more than 229 entries (approximately 500 million). The maximum capacity is 230, but performance will degrade rapidly as 230 is approached.

Companion:
object
Source:
AnyRefMap.scala
object AnyRefMap
Companion:
class
Source:
AnyRefMap.scala
@SerialVersionUID(-1582447879429021880L)
class ArrayBuffer[A] extends AbstractBuffer[A] with IndexedBuffer[A] with IndexedSeqOps[A, ArrayBuffer, ArrayBuffer[A]] with StrictOptimizedSeqOps[A, ArrayBuffer, ArrayBuffer[A]] with IterableFactoryDefaults[A, ArrayBuffer] with DefaultSerializable

An implementation of the Buffer class using an array to represent the assembled sequence internally.

An implementation of the Buffer class using an array to represent the assembled sequence internally. Append, update and random access take constant time (amortized time). Prepends and removes are linear in the buffer size.

Type parameters:
A

the type of this arraybuffer's elements.

See also:

"Scala's Collection Library overview" section on Array Buffers for more information.

Companion:
object
Source:
ArrayBuffer.scala
object ArrayBuffer extends StrictOptimizedSeqFactory[ArrayBuffer]

Factory object for the ArrayBuffer class.

Factory object for the ArrayBuffer class.

This object provides a set of operations to create mutable.ArrayBuffer values.

Companion:
class
Source:
ArrayBuffer.scala
final class ArrayBufferView[A] extends AbstractIndexedSeqView[A]
sealed abstract class ArrayBuilder[T] extends ReusableBuilder[T, Array[T]] with Serializable

A builder class for arrays.

A builder class for arrays.

Type parameters:
T

the type of the elements for the builder.

Companion:
object
Source:
ArrayBuilder.scala
object ArrayBuilder

A companion object for array builders.

A companion object for array builders.

Companion:
class
Source:
ArrayBuilder.scala
class ArrayDeque[A] extends AbstractBuffer[A] with IndexedBuffer[A] with IndexedSeqOps[A, ArrayDeque, ArrayDeque[A]] with StrictOptimizedSeqOps[A, ArrayDeque, ArrayDeque[A]] with IterableFactoryDefaults[A, ArrayDeque] with ArrayDequeOps[A, ArrayDeque, ArrayDeque[A]] with Cloneable[ArrayDeque[A]] with DefaultSerializable

An implementation of a double-ended queue that internally uses a resizable circular buffer.

An implementation of a double-ended queue that internally uses a resizable circular buffer.

Append, prepend, removeFirst, removeLast and random-access (indexed-lookup and indexed-replacement) take amortized constant time. In general, removals and insertions at i-th index are O(min(i, n-i)) and thus insertions and removals from end/beginning are fast.

Type parameters:
A

the type of this ArrayDeque's elements.

Note:

Subclasses must override the ofArray protected method to return a more specific type.

Companion:
object
Source:
ArrayDeque.scala
object ArrayDeque extends StrictOptimizedSeqFactory[ArrayDeque]

This object provides a set of operations to create ArrayDeque values.

This object provides a set of operations to create ArrayDeque values.

Companion:
class
Source:
ArrayDeque.scala
trait ArrayDequeOps[A, +CC[_], +C <: AnyRef] extends StrictOptimizedSeqOps[A, CC, C]
sealed abstract class ArraySeq[T] extends AbstractSeq[T] with IndexedSeq[T] with IndexedSeqOps[T, ArraySeq, ArraySeq[T]] with StrictOptimizedSeqOps[T, ArraySeq, ArraySeq[T]] with Serializable

A collection representing Array[T].

A collection representing Array[T]. Unlike ArrayBuffer it is always backed by the same underlying Array, therefore it is not growable or shrinkable.

Type parameters:
T

type of the elements in this wrapped array.

Companion:
object
Source:
ArraySeq.scala
object ArraySeq extends StrictOptimizedClassTagSeqFactory[ArraySeq]

A companion object used to create instances of ArraySeq.

A companion object used to create instances of ArraySeq.

Companion:
class
Source:
ArraySeq.scala
class BitSet(var elems: Array[Long]) extends AbstractSet[Int] with SortedSet[Int] with SortedSetOps[Int, SortedSet, BitSet] with StrictOptimizedIterableOps[Int, Set, BitSet] with StrictOptimizedSortedSetOps[Int, SortedSet, BitSet] with BitSet with BitSetOps[BitSet] with Serializable

A class for mutable bitsets.

A class for mutable bitsets.

Bitsets are sets of non-negative integers which are represented as variable-size arrays of bits packed into 64-bit words. The lower bound of memory footprint of a bitset is determined by the largest number stored in it.

See also:

"Scala's Collection Library overview" section on Mutable Bitsets for more information.

Companion:
object
Source:
BitSet.scala
object BitSet extends SpecificIterableFactory[Int, BitSet]
Companion:
class
Source:
BitSet.scala
trait Buffer[A] extends Seq[A] with SeqOps[A, Buffer, Buffer[A]] with Growable[A] with Shrinkable[A] with IterableFactoryDefaults[A, Buffer]

A Buffer is a growable and shrinkable Seq.

A Buffer is a growable and shrinkable Seq.

Companion:
object
Source:
Buffer.scala
object Buffer extends Delegate[Buffer]
Companion:
class
Source:
Buffer.scala
trait Builder[-A, +To] extends Growable[A]

Base trait for collection builders.

Base trait for collection builders.

After calling result() the behavior of a Builder (which is not also a scala.collection.mutable.ReusableBuilder) is undefined. No further methods should be called. It is common for mutable collections to be their own non-reusable Builder, in which case result() simply returns this.

See also:

scala.collection.mutable.ReusableBuilder for Builders which can be reused after calling result()

Source:
Builder.scala
trait Clearable

This trait forms part of collections that can be cleared with a clear() call.

This trait forms part of collections that can be cleared with a clear() call.

Source:
Growable.scala
trait Cloneable[+C <: AnyRef] extends Cloneable

A trait for cloneable collections.

A trait for cloneable collections.

Type parameters:
C

Type of the collection, covariant and with reference types as upperbound.

Source:
Cloneable.scala
final class CollisionProofHashMap[K, V](initialCapacity: Int, loadFactor: Double)(implicit ordering: Ordering[K]) extends AbstractMap[K, V] with MapOps[K, V, Map, CollisionProofHashMap[K, V]] with StrictOptimizedIterableOps[(K, V), Iterable, CollisionProofHashMap[K, V]] with StrictOptimizedMapOps[K, V, Map, CollisionProofHashMap[K, V]]

This class implements mutable maps using a hashtable with red-black trees in the buckets for good worst-case performance on hash collisions.

This class implements mutable maps using a hashtable with red-black trees in the buckets for good worst-case performance on hash collisions. An Ordering is required for the element type. Equality as determined by the Ordering has to be consistent with equals and hashCode. Universal equality of numeric types is not supported (similar to AnyRefMap).

See also:

"Scala's Collection Library overview" section on Hash Tables for more information.

Companion:
object
Source:
CollisionProofHashMap.scala
object CollisionProofHashMap extends SortedMapFactory[CollisionProofHashMap]

This object provides a set of operations to create mutable.CollisionProofHashMap values.

This object provides a set of operations to create mutable.CollisionProofHashMap values.

Companion:
class
Source:
CollisionProofHashMap.scala
trait Growable[-A] extends Clearable

This trait forms part of collections that can be augmented using a += operator and that can be cleared of all elements using a clear method.

This trait forms part of collections that can be augmented using a += operator and that can be cleared of all elements using a clear method.

Companion:
object
Source:
Growable.scala
object Growable
Companion:
class
Source:
Growable.scala
class GrowableBuilder[Elem, To <: Growable[Elem]](val elems: To) extends Builder[Elem, To]

The canonical builder for collections that are growable, i.e.

The canonical builder for collections that are growable, i.e. that support an efficient += method which adds an element to the collection.

GrowableBuilders can produce only a single instance of the collection they are growing.

Source:
GrowableBuilder.scala
@deprecatedInheritance("HashMap will be made final; use .withDefault for the common use case of computing a default value", "2.13.0")
class HashMap[K, V](initialCapacity: Int, loadFactor: Double) extends AbstractMap[K, V] with MapOps[K, V, HashMap, HashMap[K, V]] with StrictOptimizedIterableOps[(K, V), Iterable, HashMap[K, V]] with StrictOptimizedMapOps[K, V, HashMap, HashMap[K, V]] with MapFactoryDefaults[K, V, HashMap, Iterable] with Serializable

This class implements mutable maps using a hashtable.

This class implements mutable maps using a hashtable.

Type parameters:
K

the type of the keys contained in this hash map.

V

the type of the values assigned to keys in this hash map.

See also:

"Scala's Collection Library overview" section on Hash Tables for more information.

Companion:
object
Source:
HashMap.scala
object HashMap extends MapFactory[HashMap]

This object provides a set of operations to create mutable.HashMap values.

This object provides a set of operations to create mutable.HashMap values.

Companion:
class
Source:
HashMap.scala
final class HashSet[A](initialCapacity: Int, loadFactor: Double) extends AbstractSet[A] with SetOps[A, HashSet, HashSet[A]] with StrictOptimizedIterableOps[A, HashSet, HashSet[A]] with IterableFactoryDefaults[A, HashSet] with Serializable

This class implements mutable sets using a hashtable.

This class implements mutable sets using a hashtable.

See also:

"Scala's Collection Library overview" section on Hash Tables for more information.

Companion:
object
Source:
HashSet.scala
object HashSet extends IterableFactory[HashSet]

This object provides a set of operations to create mutable.HashSet values.

This object provides a set of operations to create mutable.HashSet values.

Companion:
class
Source:
HashSet.scala
abstract class ImmutableBuilder[-A, C <: IterableOnce[_]](empty: C) extends ReusableBuilder[A, C]

Reusable builder for immutable collections

Reusable builder for immutable collections

Source:
ImmutableBuilder.scala
trait IndexedBuffer[A] extends IndexedSeq[A] with IndexedSeqOps[A, IndexedBuffer, IndexedBuffer[A]] with Buffer[A] with IterableFactoryDefaults[A, IndexedBuffer]
Companion:
object
Source:
Buffer.scala
object IndexedBuffer extends Delegate[IndexedBuffer]
Companion:
class
Source:
Buffer.scala
trait IndexedSeq[T] extends Seq[T] with IndexedSeq[T] with IndexedSeqOps[T, IndexedSeq, IndexedSeq[T]] with IterableFactoryDefaults[T, IndexedSeq]
Companion:
object
Source:
IndexedSeq.scala
object IndexedSeq extends Delegate[IndexedSeq]
Companion:
class
Source:
IndexedSeq.scala
trait IndexedSeqOps[A, +CC[_], +C <: AnyRef] extends IndexedSeqOps[A, CC, C] with SeqOps[A, CC, C]
trait Iterable[A] extends Iterable[A] with IterableOps[A, Iterable, Iterable[A]] with IterableFactoryDefaults[A, Iterable]
Companion:
object
Source:
Iterable.scala
object Iterable extends Delegate[Iterable]

This object provides a set of operations to create mutable.Iterable values.

This object provides a set of operations to create mutable.Iterable values.

Companion:
class
Source:
Iterable.scala
object LinkedHashMap extends MapFactory[LinkedHashMap]

This object provides a set of operations to create LinkedHashMap values.

This object provides a set of operations to create LinkedHashMap values.

Companion:
class
Source:
LinkedHashMap.scala
class LinkedHashMap[K, V] extends AbstractMap[K, V] with SeqMap[K, V] with MapOps[K, V, LinkedHashMap, LinkedHashMap[K, V]] with StrictOptimizedIterableOps[(K, V), Iterable, LinkedHashMap[K, V]] with StrictOptimizedMapOps[K, V, LinkedHashMap, LinkedHashMap[K, V]] with MapFactoryDefaults[K, V, LinkedHashMap, Iterable] with DefaultSerializable

This class implements mutable maps using a hashtable.

This class implements mutable maps using a hashtable. The iterator and all traversal methods of this class visit elements in the order they were inserted.

Type parameters:
K

the type of the keys contained in this hash map.

V

the type of the values assigned to keys in this hash map.

Companion:
object
Source:
LinkedHashMap.scala
class LinkedHashSet[A] extends AbstractSet[A] with SetOps[A, LinkedHashSet, LinkedHashSet[A]] with StrictOptimizedIterableOps[A, LinkedHashSet, LinkedHashSet[A]] with IterableFactoryDefaults[A, LinkedHashSet] with DefaultSerializable

This class implements mutable sets using a hashtable.

This class implements mutable sets using a hashtable. The iterator and all traversal methods of this class visit elements in the order they were inserted.

Type parameters:
A

the type of the elements contained in this set.

Companion:
object
Source:
LinkedHashSet.scala
object LinkedHashSet extends IterableFactory[LinkedHashSet]

This object provides a set of operations to create LinkedHashSet values.

This object provides a set of operations to create LinkedHashSet values.

Companion:
class
Source:
LinkedHashSet.scala
@SerialVersionUID(-8428291952499836345L)
class ListBuffer[A] extends AbstractBuffer[A] with SeqOps[A, ListBuffer, ListBuffer[A]] with StrictOptimizedSeqOps[A, ListBuffer, ListBuffer[A]] with ReusableBuilder[A, List[A]] with IterableFactoryDefaults[A, ListBuffer] with DefaultSerializable

A Buffer implementation backed by a list.

A Buffer implementation backed by a list. It provides constant time prepend and append. Most other operations are linear.

Type parameters:
A

the type of this list buffer's elements.

See also:

"Scala's Collection Library overview" section on List Buffers for more information.

Companion:
object
Source:
ListBuffer.scala
object ListBuffer extends StrictOptimizedSeqFactory[ListBuffer]
Companion:
class
Source:
ListBuffer.scala
final class LongMap[V] extends AbstractMap[Long, V] with MapOps[Long, V, Map, LongMap[V]] with StrictOptimizedIterableOps[(Long, V), Iterable, LongMap[V]] with Serializable

This class implements mutable maps with Long keys based on a hash table with open addressing.

This class implements mutable maps with Long keys based on a hash table with open addressing.

Basic map operations on single entries, including contains and get, are typically substantially faster with LongMap than HashMap. Methods that act on the whole map, including foreach and map are not in general expected to be faster than with a generic map, save for those that take particular advantage of the internal structure of the map: foreachKey, foreachValue, mapValuesNow, and transformValues.

Maps with open addressing may become less efficient at lookup after repeated addition/removal of elements. Although LongMap makes a decent attempt to remain efficient regardless, calling repack on a map that will no longer have elements removed but will be used heavily may save both time and storage space.

This map is not intended to contain more than 229 entries (approximately 500 million). The maximum capacity is 230, but performance will degrade rapidly as 2^30 is approached.

Companion:
object
Source:
LongMap.scala
object LongMap
Companion:
class
Source:
LongMap.scala
trait Map[K, V] extends Iterable[(K, V)] with Map[K, V] with MapOps[K, V, Map, Map[K, V]] with Growable[(K, V)] with Shrinkable[K] with MapFactoryDefaults[K, V, Map, Iterable]

Base type of mutable Maps

Base type of mutable Maps

Companion:
object
Source:
Map.scala
object Map extends Delegate[Map]

This object provides a set of operations to create mutable.Map values.

This object provides a set of operations to create mutable.Map values.

Companion:
class
Source:
Map.scala
trait MapOps[K, V, +CC <: (MapOps), +C <: MapOps[K, V, CC, C]] extends IterableOps[(K, V), Iterable, C] with MapOps[K, V, CC, C] with Cloneable[C] with Builder[(K, V), C] with Growable[(K, V)] with Shrinkable[K]
Source:
Map.scala
sealed class PriorityQueue[A](implicit val ord: Ordering[A]) extends AbstractIterable[A] with Iterable[A] with IterableOps[A, Iterable, PriorityQueue[A]] with StrictOptimizedIterableOps[A, Iterable, PriorityQueue[A]] with Builder[A, PriorityQueue[A]] with Cloneable[PriorityQueue[A]] with Growable[A] with Serializable

This class implements priority queues using a heap.

This class implements priority queues using a heap. To prioritize elements of type A there must be an implicit Ordering[A] available at creation.

If multiple elements have the same priority in the ordering of this PriorityQueue, no guarantees are made regarding the order in which elements are returned by dequeue or dequeueAll. In particular, that means this class does not guarantee first in first out behaviour that may be incorrectly inferred from the Queue part of the name of this class.

Only the dequeue and dequeueAll methods will return elements in priority order (while removing elements from the heap). Standard collection methods including drop, iterator, and toString will remove or traverse the heap in whichever order seems most convenient.

Therefore, printing a PriorityQueue will not reveal the priority order of the elements, though the highest-priority element will be printed first. To print the elements in order, one must duplicate the PriorityQueue (by using clone, for instance) and then dequeue them:

Type parameters:
A

type of the elements in this priority queue.

Value parameters:
ord

implicit ordering used to compare the elements of type A.

Example:

val pq = collection.mutable.PriorityQueue(1, 2, 5, 3, 7)
println(pq)                  // elements probably not in order
println(pq.clone.dequeueAll) // prints ArraySeq(7, 5, 3, 2, 1)
Companion:
object
Source:
PriorityQueue.scala
object PriorityQueue extends SortedIterableFactory[PriorityQueue]
Companion:
class
Source:
PriorityQueue.scala
class Queue[A] extends ArrayDeque[A] with IndexedSeqOps[A, Queue, Queue[A]] with StrictOptimizedSeqOps[A, Queue, Queue[A]] with IterableFactoryDefaults[A, Queue] with ArrayDequeOps[A, Queue, Queue[A]] with Cloneable[Queue[A]] with DefaultSerializable

Queue objects implement data structures that allow to insert and retrieve elements in a first-in-first-out (FIFO) manner.

Queue objects implement data structures that allow to insert and retrieve elements in a first-in-first-out (FIFO) manner.

Companion:
object
Source:
Queue.scala
object Queue extends StrictOptimizedSeqFactory[Queue]

This object provides a set of operations to create Queue values.

This object provides a set of operations to create Queue values.

Companion:
class
Source:
Queue.scala
trait ReusableBuilder[-Elem, +To] extends Builder[Elem, To]

ReusableBuilder is a marker trait that indicates that a Builder can be reused to build more than one instance of a collection.

ReusableBuilder is a marker trait that indicates that a Builder can be reused to build more than one instance of a collection. In particular, calling result() followed by clear() will produce a collection and reset the builder to begin building a new collection of the same type.

In general no method other than clear() may be called after result(). It is up to subclasses to implement and to document other allowed sequences of operations (e.g. calling other methods after result() in order to obtain different snapshots of a collection under construction).

Type parameters:
Elem

the type of elements that get added to the builder.

To

the type of collection that it produced.

Source:
ReusableBuilder.scala
trait Seq[A] extends Iterable[A] with Seq[A] with SeqOps[A, Seq, Seq[A]] with IterableFactoryDefaults[A, Seq]
Companion:
object
Source:
Seq.scala
object Seq extends Delegate[Seq]

This object provides a set of operations to create mutable.Seq values.

This object provides a set of operations to create mutable.Seq values.

Companion:
class
Source:
Seq.scala
trait SeqMap[K, V] extends Map[K, V] with SeqMap[K, V] with MapOps[K, V, SeqMap, SeqMap[K, V]] with MapFactoryDefaults[K, V, SeqMap, Iterable]

A generic trait for ordered mutable maps.

A generic trait for ordered mutable maps. Concrete classes have to provide functionality for the abstract methods in SeqMap.

Note that when checking for equality SeqMap does not take into account ordering.

Type parameters:
K

the type of the keys contained in this linked map.

V

the type of the values associated with the keys in this linked map.

Companion:
object
Source:
SeqMap.scala
object SeqMap extends Delegate[SeqMap]
Companion:
class
Source:
SeqMap.scala
trait SeqOps[A, +CC[_], +C <: AnyRef] extends SeqOps[A, CC, C] with Cloneable[C]
Source:
Seq.scala
trait Set[A] extends Iterable[A] with Set[A] with SetOps[A, Set, Set[A]] with IterableFactoryDefaults[A, Set]

Base trait for mutable sets

Base trait for mutable sets

Companion:
object
Source:
Set.scala
object Set extends Delegate[Set]

This object provides a set of operations to create mutable.Set values.

This object provides a set of operations to create mutable.Set values.

Companion:
class
Source:
Set.scala
trait SetOps[A, +CC[X], +C <: SetOps[A, CC, C]] extends SetOps[A, CC, C] with IterableOps[A, CC, C] with Cloneable[C] with Builder[A, C] with Growable[A] with Shrinkable[A]
Source:
Set.scala
trait Shrinkable[-A]

This trait forms part of collections that can be reduced using a -= operator.

This trait forms part of collections that can be reduced using a -= operator.

Source:
Shrinkable.scala
trait SortedMap[K, V] extends SortedMap[K, V] with Map[K, V] with SortedMapOps[K, V, SortedMap, SortedMap[K, V]] with SortedMapFactoryDefaults[K, V, SortedMap, Iterable, Map]

Base type for mutable sorted map collections

Base type for mutable sorted map collections

Companion:
object
Source:
SortedMap.scala
object SortedMap extends Delegate[SortedMap]
Companion:
class
Source:
SortedMap.scala
trait SortedMapOps[K, V, +CC <: ([X, Y] =>> Map[X, Y] & SortedMapOps[X, Y, CC, _]), +C <: SortedMapOps[K, V, CC, C]] extends SortedMapOps[K, V, CC, C] with MapOps[K, V, Map, C]
trait SortedSet[A] extends Set[A] with SortedSet[A] with SortedSetOps[A, SortedSet, SortedSet[A]] with SortedSetFactoryDefaults[A, SortedSet, Set]

Base type for mutable sorted set collections

Base type for mutable sorted set collections

Companion:
object
Source:
SortedSet.scala
object SortedSet extends Delegate[SortedSet]

This object provides a set of operations to create mutable.Sortedset values.

This object provides a set of operations to create mutable.Sortedset values.

Companion:
class
Source:
SortedSet.scala
trait SortedSetOps[A, +CC <: (SortedSet), +C <: SortedSetOps[A, CC, C]] extends SetOps[A, Set, C] with SortedSetOps[A, CC, C]
@migration("Stack is now based on an ArrayDeque instead of a linked list", "2.13.0")
class Stack[A] extends ArrayDeque[A] with IndexedSeqOps[A, Stack, Stack[A]] with StrictOptimizedSeqOps[A, Stack, Stack[A]] with IterableFactoryDefaults[A, Stack] with ArrayDequeOps[A, Stack, Stack[A]] with Cloneable[Stack[A]] with DefaultSerializable

A stack implements a data structure which allows to store and retrieve objects in a last-in-first-out (LIFO) fashion.

A stack implements a data structure which allows to store and retrieve objects in a last-in-first-out (LIFO) fashion.

Note that operations which consume and produce iterables preserve order, rather than reversing it (as would be expected from building a new stack by pushing an element at a time).

Type parameters:
A

type of the elements contained in this stack.

Companion:
object
Source:
Stack.scala
object Stack extends StrictOptimizedSeqFactory[Stack]

This object provides a set of operations to create Stack values.

This object provides a set of operations to create Stack values.

Companion:
class
Source:
Stack.scala
final class StringBuilder(val underlying: StringBuilder) extends AbstractSeq[Char] with ReusableBuilder[Char, String] with IndexedSeq[Char] with IndexedSeqOps[Char, IndexedSeq, StringBuilder] with IterableFactoryDefaults[Char, IndexedSeq] with CharSequence with Serializable

A builder for mutable sequence of characters.

A builder for mutable sequence of characters. This class provides an API mostly compatible with java.lang.StringBuilder, except where there are conflicts with the Scala collections API (such as the reverse method.)

This Builder can be reused after calling result() without an intermediate call to clear() in order to build multiple related results.

Companion:
object
Source:
StringBuilder.scala
object StringBuilder
Companion:
class
Source:
StringBuilder.scala
sealed class TreeMap[K, V] extends AbstractMap[K, V] with SortedMap[K, V] with SortedMapOps[K, V, TreeMap, TreeMap[K, V]] with StrictOptimizedIterableOps[(K, V), Iterable, TreeMap[K, V]] with StrictOptimizedMapOps[K, V, Map, TreeMap[K, V]] with StrictOptimizedSortedMapOps[K, V, TreeMap, TreeMap[K, V]] with SortedMapFactoryDefaults[K, V, TreeMap, Iterable, Map] with DefaultSerializable

A mutable sorted map implemented using a mutable red-black tree as underlying data structure.

A mutable sorted map implemented using a mutable red-black tree as underlying data structure.

Type parameters:
K

the type of the keys contained in this tree map.

V

the type of the values associated with the keys.

Value parameters:
ordering

the implicit ordering used to compare objects of type A.

Companion:
object
Source:
TreeMap.scala
object TreeMap extends SortedMapFactory[TreeMap]

This object provides a set of operations to create mutable.TreeMap values.

This object provides a set of operations to create mutable.TreeMap values.

Companion:
class
Source:
TreeMap.scala
sealed class TreeSet[A] extends AbstractSet[A] with SortedSet[A] with SortedSetOps[A, TreeSet, TreeSet[A]] with StrictOptimizedIterableOps[A, Set, TreeSet[A]] with StrictOptimizedSortedSetOps[A, TreeSet, TreeSet[A]] with SortedSetFactoryDefaults[A, TreeSet, Set] with DefaultSerializable

A mutable sorted set implemented using a mutable red-black tree as underlying data structure.

A mutable sorted set implemented using a mutable red-black tree as underlying data structure.

Type parameters:
A

the type of the keys contained in this tree set.

Value parameters:
ordering

the implicit ordering used to compare objects of type A.

Companion:
object
Source:
TreeSet.scala
object TreeSet extends SortedIterableFactory[TreeSet]

This object provides a set of operations to create mutable.TreeSet values.

This object provides a set of operations to create mutable.TreeSet values.

Companion:
class
Source:
TreeSet.scala
sealed class UnrolledBuffer[T](implicit val tag: ClassTag[T]) extends AbstractBuffer[T] with Buffer[T] with Seq[T] with SeqOps[T, UnrolledBuffer, UnrolledBuffer[T]] with StrictOptimizedSeqOps[T, UnrolledBuffer, UnrolledBuffer[T]] with EvidenceIterableFactoryDefaults[T, UnrolledBuffer, ClassTag] with Builder[T, UnrolledBuffer[T]] with DefaultSerializable

A buffer that stores elements in an unrolled linked list.

A buffer that stores elements in an unrolled linked list.

Unrolled linked lists store elements in linked fixed size arrays.

Unrolled buffers retain locality and low memory overhead properties of array buffers, but offer much more efficient element addition, since they never reallocate and copy the internal array.

However, they provide O(n/m) complexity random access, where n is the number of elements, and m the size of internal array chunks.

Ideal to use when: - elements are added to the buffer and then all of the elements are traversed sequentially - two unrolled buffers need to be concatenated (see concat)

Better than singly linked lists for random access, but should still be avoided for such a purpose.

Companion:
object
Source:
UnrolledBuffer.scala
object UnrolledBuffer extends StrictOptimizedClassTagSeqFactory[UnrolledBuffer]
Companion:
class
Source:
UnrolledBuffer.scala
class WeakHashMap[K, V] extends JMapWrapper[K, V] with JMapWrapperLike[K, V, WeakHashMap, WeakHashMap[K, V]] with MapFactoryDefaults[K, V, WeakHashMap, Iterable]

A hash map with references to entries which are weakly reachable.

A hash map with references to entries which are weakly reachable. Entries are removed from this map when the key is no longer (strongly) referenced. This class wraps java.util.WeakHashMap.

Type parameters:
K

type of keys contained in this map

V

type of values associated with the keys

See also:

"Scala's Collection Library overview" section on Weak Hash Maps for more information.

Companion:
object
Source:
WeakHashMap.scala
object WeakHashMap extends MapFactory[WeakHashMap]

This object provides a set of operations to create WeakHashMap values.

This object provides a set of operations to create WeakHashMap values.

Companion:
class
Source:
WeakHashMap.scala

Deprecated classlikes

@deprecated("Use an immutable.ListMap assigned to a var instead of mutable.ListMap", "2.13.0")
class ListMap[K, V] extends AbstractMap[K, V] with MapOps[K, V, ListMap, ListMap[K, V]] with StrictOptimizedIterableOps[(K, V), Iterable, ListMap[K, V]] with StrictOptimizedMapOps[K, V, ListMap, ListMap[K, V]] with MapFactoryDefaults[K, V, ListMap, Iterable] with DefaultSerializable

A simple mutable map backed by a list, so it preserves insertion order.

A simple mutable map backed by a list, so it preserves insertion order.

Type parameters:
K

the type of the keys contained in this list map.

V

the type of the values assigned to keys in this list map.

Companion:
object
Deprecated
Source:
ListMap.scala
@SerialVersionUID(3L) @deprecated("Use an immutable.ListMap assigned to a var instead of mutable.ListMap", "2.13.0")
object ListMap extends MapFactory[ListMap]

This object provides a set of operations to create mutable.ListMap values.

This object provides a set of operations to create mutable.ListMap values.

Companion:
class
Deprecated
Source:
ListMap.scala
@deprecated("Use a scala.collection.mutable.MultiDict in the scala-collection-contrib module", "2.13.0")
trait MultiMap[K, V] extends Map[K, Set[V]]

A trait for mutable maps with multiple values assigned to a key.

A trait for mutable maps with multiple values assigned to a key.

This class is typically used as a mixin. It turns maps which map K to Set[V] objects into multimaps that map K to V objects.

Example:

// first import all necessary types from package `collection.mutable`
import collection.mutable.{ HashMap, MultiMap, Set }
// to create a `MultiMap` the easiest way is to mixin it into a normal
// `Map` instance
val mm = new HashMap[Int, Set[String]] with MultiMap[Int, String]
// to add key-value pairs to a multimap it is important to use
// the method `addBinding` because standard methods like `+` will
// overwrite the complete key-value pair instead of adding the
// value to the existing key
mm.addBinding(1, "a")
mm.addBinding(2, "b")
mm.addBinding(1, "c")
// mm now contains `Map(2 -> Set(b), 1 -> Set(c, a))`
// to check if the multimap contains a value there is method
// `entryExists`, which allows to traverse the including set
mm.entryExists(1, _ == "a") == true
mm.entryExists(1, _ == "b") == false
mm.entryExists(2, _ == "b") == true
// to remove a previous added value there is the method `removeBinding`
mm.removeBinding(1, "a")
mm.entryExists(1, _ == "a") == false
Deprecated
Source:
MultiMap.scala
@deprecated("Use HashMap or one of the specialized versions (LongMap, AnyRefMap) instead of OpenHashMap", "2.13.0") @SerialVersionUID(3L)
object OpenHashMap extends MapFactory[OpenHashMap]
Companion:
class
Deprecated
Source:
OpenHashMap.scala
@deprecated("Use HashMap or one of the specialized versions (LongMap, AnyRefMap) instead of OpenHashMap", "2.13.0")
class OpenHashMap[Key, Value](initialSize: Int) extends AbstractMap[Key, Value] with MapOps[Key, Value, OpenHashMap, OpenHashMap[Key, Value]] with StrictOptimizedIterableOps[(Key, Value), Iterable, OpenHashMap[Key, Value]] with MapFactoryDefaults[Key, Value, OpenHashMap, Iterable] with DefaultSerializable

A mutable hash map based on an open addressing method.

A mutable hash map based on an open addressing method. The precise scheme is undefined, but it should make a reasonable effort to ensure that an insert with consecutive hash codes is not unnecessarily penalised. In particular, mappings of consecutive integer keys should work without significant performance loss.

Type parameters:
Key

type of the keys in this map.

Value

type of the values in this map.

Value parameters:
initialSize

the initial size of the internal hash table.

Companion:
object
Deprecated
Source:
OpenHashMap.scala

Deprecated types

@deprecated("Use Stack instead of ArrayStack; it now uses an array-based implementation", "2.13.0")
type ArrayStack[X] = Stack[X]
Deprecated
Source:
package.scala
@deprecated("GrowingBuilder has been renamed to GrowableBuilder", "2.13.0")
type GrowingBuilder[Elem, To <: Growable[Elem]] = GrowableBuilder[Elem, To]
Deprecated
Source:
package.scala
@deprecated("IndexedOptimizedBuffer has been renamed to IndexedBuffer", "2.13.0")
type IndexedOptimizedBuffer[A] = IndexedBuffer[A]
Deprecated
Source:
package.scala
@deprecated("IndexedOptimizedSeq has been renamed to IndexedSeq", "2.13.0")
type IndexedOptimizedSeq[A] = IndexedSeq[A]
Deprecated
Source:
package.scala
@deprecated("mutable.LinearSeq has been removed; use LinearSeq with mutable.Seq instead", "2.13.0")
type LinearSeq[X] = Seq[X] & LinearSeq[X]
Deprecated
Source:
package.scala
@deprecated("Use Iterable instead of Traversable", "2.13.0")
type Traversable[X] = Iterable[X]
Deprecated
Source:
package.scala
@deprecated("Use ArraySeq instead of WrappedArray; it can represent both, boxed and unboxed arrays", "2.13.0")
type WrappedArray[X] = ArraySeq[X]
Deprecated
Source:
package.scala

Value members

Deprecated fields

@deprecated("Use Stack instead of ArrayStack; it now uses an array-based implementation", "2.13.0")
val ArrayStack: Stack.type
Deprecated
Source:
package.scala
@deprecated("Use Iterable instead of Traversable", "2.13.0")
val Traversable: Iterable.type
Deprecated
Source:
package.scala
@deprecated("Use ArraySeq instead of WrappedArray; it can represent both, boxed and unboxed arrays", "2.13.0")
val WrappedArray: ArraySeq.type
Deprecated
Source:
package.scala