Scala Standard Library2.12.18 < Back
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# Packages

-  package root

  This is the documentation for the Scala standard library.

  This is the documentation for the Scala standard library.

  #### Package structure

  The scala package contains core types like `Int`, `Float`, `Array` or `Option` which are accessible in all Scala compilation units without explicit qualification or imports.

  Notable packages include:

  - `scala.collection` and its sub-packages contain Scala's collections framework
    - `scala.collection.immutable` - Immutable, sequential data-structures such as `Vector`, `List`, `Range`, `HashMap` or `HashSet`
    - `scala.collection.mutable` - Mutable, sequential data-structures such as `ArrayBuffer`, `StringBuilder`, `HashMap` or `HashSet`
    - `scala.collection.concurrent` - Mutable, concurrent data-structures such as `TrieMap`
    - `scala.collection.parallel.immutable` - Immutable, parallel data-structures such as `ParVector`, `ParRange`, `ParHashMap` or `ParHashSet`
    - `scala.collection.parallel.mutable` - Mutable, parallel data-structures such as `ParArray`, `ParHashMap`, `ParTrieMap` or `ParHashSet`
  - `scala.concurrent` - Primitives for concurrent programming such as `Futures` and `Promises`
  - `scala.io` - Input and output operations
  - `scala.math` - Basic math functions and additional numeric types like `BigInt` and `BigDecimal`
  - `scala.sys` - Interaction with other processes and the operating system
  - `scala.util.matching` - Regular expressions

  Other packages exist. See the complete list on the right.

  Additional parts of the standard library are shipped as separate libraries. These include:

  - `scala.reflect` - Scala's reflection API (scala-reflect.jar)
  - `scala.xml` - XML parsing, manipulation, and serialization (scala-xml.jar)
  - `scala.swing` - A convenient wrapper around Java's GUI framework called Swing (scala-swing.jar)
  - `scala.util.parsing` - Parser combinators (scala-parser-combinators.jar)

  #### Automatic imports

  Identifiers in the scala package and the `scala.Predef` object are always in scope by default.

  Some of these identifiers are type aliases provided as shortcuts to commonly used classes. For example, `List` is an alias for `scala.collection.immutable.List`.

  Other aliases refer to classes provided by the underlying platform. For example, on the JVM, `String` is an alias for `java.lang.String`.

  Definition Classes
    root
-  package scala

  Core Scala types.

  Core Scala types. They are always available without an explicit import.

  Definition Classes
    root
-  package collection

  Contains the base traits and objects needed to use and extend Scala's collection library.

  Contains the base traits and objects needed to use and extend Scala's collection library.

  #### Guide

  A detailed guide for using the collections library is available at http://docs.scala-lang.org/overviews/collections/introduction.html. Developers looking to extend the collections library can find a description of its architecture at http://docs.scala-lang.org/overviews/core/architecture-of-scala-collections.html.

  #### Using Collections

  It is convenient to treat all collections as either a scala.collection.Traversable or scala.collection.Iterable, as these traits define the vast majority of operations on a collection.

  Collections can, of course, be treated as specifically as needed, and the library is designed to ensure that the methods that transform collections will return a collection of the same type:

      scala> val array = Array(1,2,3,4,5,6)
      array: Array[Int] = Array(1, 2, 3, 4, 5, 6)

      scala> array map { _.toString }
      res0: Array[String] = Array(1, 2, 3, 4, 5, 6)

      scala> val list = List(1,2,3,4,5,6)
      list: List[Int] = List(1, 2, 3, 4, 5, 6)

      scala> list map { _.toString }
      res1: List[String] = List(1, 2, 3, 4, 5, 6)

  #### Creating Collections

  The most common way to create a collection is to use its companion object as a factory. The three most commonly used collections are scala.collection.Seq, scala.collection.immutable.Set, and scala.collection.immutable.Map. They can be used directly as shown below since their companion objects are all available as type aliases in either the scala package or in `scala.Predef`. New collections are created like this:

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

      scala> val set = Set(1,2,3,4,1)
      set: scala.collection.immutable.Set[Int] = Set(1, 2, 3, 4)

      scala> val map = Map(1 -> "one", 2 -> "two", 3 -> "three", 2 -> "too")
      map: scala.collection.immutable.Map[Int,String] = Map(1 -> one, 2 -> too, 3 -> three)

  It is also typical to prefer the scala.collection.immutable collections over those in scala.collection.mutable; the types aliased in the `scala.Predef` object are the immutable versions.

  Also note that the collections library was carefully designed to include several implementations of each of the three basic collection types. These implementations have specific performance characteristics which are described in the guide.

  The concrete parallel collections also have specific performance characteristics which are described in the parallel collections guide

  ##### Converting to and from Java Collections

  The scala.collection.JavaConverters object provides a collection of decorators that allow converting between Scala and Java collections using `asScala` and `asJava` methods.

  Definition Classes
    scala
-  package concurrent
  Definition Classes
    collection
- Map
- TrieMap

t

scala.collection.concurrent

# Map 

###

#### trait Map[A, B] extends mutable.Map[A, B]

A template trait for mutable maps that allow concurrent access.

This is a base trait for all Scala concurrent map implementations. It provides all of the methods a `Map` does, with the difference that all the changes are atomic. It also describes methods specific to concurrent maps.

Note: The concurrent maps do not accept `null` for keys or values.

A

  the key type of the map

B

  the value type of the map

Source
  Map.scala
Since

  2.8

See also

  "Scala's Collection Library overview" section on `Concurrent Maps` for more information.

Linear Supertypes
mutable.Map[A, B], mutable.MapLike[A, B, mutable.Map[A, B]], mutable.Cloneable[mutable.Map[A, B]], Cloneable, java.lang.Cloneable, Shrinkable[A], Builder[(A, B), mutable.Map[A, B]], Growable[(A, B)], Clearable, collection.Map[A, B], MapLike[A, B, mutable.Map[A, B]], Subtractable[A, mutable.Map[A, B]], PartialFunction[A, B], (A) ⇒ B, GenMap[A, B], GenMapLike[A, B, mutable.Map[A, B]], mutable.Iterable[(A, B)], Iterable[(A, B)], IterableLike[(A, B), mutable.Map[A, B]], Equals, GenIterable[(A, B)], GenIterableLike[(A, B), mutable.Map[A, B]], mutable.Traversable[(A, B)], Mutable, Traversable[(A, B)], GenTraversable[(A, B)], GenericTraversableTemplate[(A, B), mutable.Iterable], TraversableLike[(A, B), mutable.Map[A, B]], GenTraversableLike[(A, B), mutable.Map[A, B]], Parallelizable[(A, B), ParMap[A, B]], TraversableOnce[(A, B)], GenTraversableOnce[(A, B)], FilterMonadic[(A, B), mutable.Map[A, B]], HasNewBuilder[(A, B), mutable.Map[A, B]], AnyRef, Any
Known Subclasses
TrieMap
 
Ordering

1. Alphabetic
2. By Inheritance

Inherited

1. Map
2. Map
3. MapLike
4. Cloneable
5. Cloneable
6. Cloneable
7. Shrinkable
8. Builder
9. Growable
10. Clearable
11. Map
12. MapLike
13. Subtractable
14. PartialFunction
15. Function1
16. GenMap
17. GenMapLike
18. Iterable
19. Iterable
20. IterableLike
21. Equals
22. GenIterable
23. GenIterableLike
24. Traversable
25. Mutable
26. Traversable
27. GenTraversable
28. GenericTraversableTemplate
29. TraversableLike
30. GenTraversableLike
31. Parallelizable
32. TraversableOnce
33. GenTraversableOnce
34. FilterMonadic
35. HasNewBuilder
36. AnyRef
37. Any

Implicitly

1. by CollectionsHaveToParArray
2. by MonadOps
3. by any2stringadd
4. by StringFormat
5. by Ensuring
6. by ArrowAssoc
7. by alternateImplicit

1. Hide All
2. Show All

Visibility

1. Public
2. All

### Type Members

1.  class DefaultKeySet extends AbstractSet[K] with Set[K] with Serializable

   The implementation class of the set returned by `keySet`.

   The implementation class of the set returned by `keySet`.

   Attributes
     protected
   Definition Classes
     MapLike
   Annotations
     @SerialVersionUID()
2.  class DefaultValuesIterable extends AbstractIterable[V] with Iterable[V] with Serializable

   The implementation class of the iterable returned by `values`.

   The implementation class of the iterable returned by `values`.

   Attributes
     protected
   Definition Classes
     MapLike
3.  class FilteredKeys extends AbstractMap[K, V] with DefaultMap[K, V]
   Attributes
     protected
   Definition Classes
     MapLike
4.  class MappedValues[W] extends AbstractMap[K, W] with DefaultMap[K, W]
   Attributes
     protected
   Definition Classes
     MapLike
5.  class WithFilter extends FilterMonadic[A, Repr]

   A class supporting filtered operations.

   A class supporting filtered operations. Instances of this class are returned by method `withFilter`.

   Definition Classes
     TraversableLike
6.  type Self = mutable.Map[A, B]

   The type implementing this traversable

   The type implementing this traversable

   Attributes
     protected[this]
   Definition Classes
     TraversableLike

### Abstract Value Members

1.  abstract def +=(kv: (A, B)): Map.this.type

   Adds a new key/value pair to this map.

   Adds a new key/value pair to this map. If the map already contains a mapping for the key, it will be overridden by the new value.

   kv

     the key/value pair.

   returns

     the map itself

   Definition Classes
     MapLike → Builder → Growable
2.  abstract def -=(key: A): Map.this.type

   Removes a key from this map.

   Removes a key from this map.

   key

     the key to be removed

   returns

     the map itself.

   Definition Classes
     MapLike → Shrinkable
3.  abstract def get(key: A): Option[B]

   Optionally returns the value associated with a key.

   Optionally returns the value associated with a key.

   key

     the key value

   returns

     an option value containing the value associated with `key` in this map, or `None` if none exists.

   Definition Classes
     MapLike → GenMapLike
4.  abstract def iterator: Iterator[(A, B)]

   Creates a new iterator over all key/value pairs of this map

   Creates a new iterator over all key/value pairs of this map

   returns

     the new iterator

   Definition Classes
     MapLike → IterableLike → GenIterableLike
5.  abstract def putIfAbsent(k: A, v: B): Option[B]

   Associates the given key with a given value, unless the key was already associated with some other value.

   Associates the given key with a given value, unless the key was already associated with some other value.

   This is an atomic operation.

   k

     key with which the specified value is to be associated with

   v

     value to be associated with the specified key

   returns

     `Some(oldvalue)` if there was a value `oldvalue` previously associated with the specified key, or `None` if there was no mapping for the specified key

6.  abstract def remove(k: A, v: B): Boolean

   Removes the entry for the specified key if it's currently mapped to the specified value.

   Removes the entry for the specified key if it's currently mapped to the specified value.

   This is an atomic operation.

   k

     key for which the entry should be removed

   v

     value expected to be associated with the specified key if the removal is to take place

   returns

     `true` if the removal took place, `false` otherwise

7.  abstract def replace(k: A, v: B): Option[B]

   Replaces the entry for the given key only if it was previously mapped to some value.

   Replaces the entry for the given key only if it was previously mapped to some value.

   This is an atomic operation.

   k

     key for which the entry should be replaced

   v

     value to be associated with the specified key

   returns

     `Some(v)` if the given key was previously mapped to some value `v`, or `None` otherwise

8.  abstract def replace(k: A, oldvalue: B, newvalue: B): Boolean

   Replaces the entry for the given key only if it was previously mapped to a given value.

   Replaces the entry for the given key only if it was previously mapped to a given value.

   This is an atomic operation.

   k

     key for which the entry should be replaced

   oldvalue

     value expected to be associated with the specified key if replacing is to happen

   newvalue

     value to be associated with the specified key

   returns

     `true` if the entry was replaced, `false` otherwise

### Concrete Value Members

1.  final def !=(arg0: Any): Boolean

   Test two objects for inequality.

   Test two objects for inequality.

   returns

     `true` if !(this == that), false otherwise.

   Definition Classes
     AnyRef → Any
2.  final def ##(): Int

   Equivalent to `x.hashCode` except for boxed numeric types and `null`.

   Equivalent to `x.hashCode` except for boxed numeric types and `null`. For numerics, it returns a hash value which is consistent with value equality: if two value type instances compare as true, then ## will produce the same hash value for each of them. For `null` returns a hashcode where `null.hashCode` throws a `NullPointerException`.

   returns

     a hash value consistent with ==

   Definition Classes
     AnyRef → Any
3.  def +[V1 >: B](elem1: (A, V1), elem2: (A, V1), elems: (A, V1)*): mutable.Map[A, V1]

   Creates a new map containing two or more key/value mappings and all the key/value mappings of this map.

   Creates a new map containing two or more key/value mappings and all the key/value mappings of this map.

   Specified mappings will override existing mappings from this map with the same keys.

   V1

     the type of the added values

   elem1

     the first element to add.

   elem2

     the second element to add.

   elems

     the remaining elements to add.

   returns

     a new map containing mappings of this map and two or more specified mappings.

   Definition Classes
     MapLike → MapLike
   Annotations
     @migration
   Migration

     (Changed in version 2.8.0) `+` creates a new map. Use `+=` to add an element to this map and return that map itself.

4.  def +[V1 >: B](kv: (A, V1)): mutable.Map[A, V1]

   Creates a new map containing a new key/value mapping and all the key/value mappings of this map.

   Creates a new map containing a new key/value mapping and all the key/value mappings of this map.

   Mapping `kv` will override existing mappings from this map with the same key.

   V1

     the type of the value in the key/value pair.

   kv

     the key/value mapping to be added

   returns

     a new map containing mappings of this map and the mapping `kv`.

   Definition Classes
     MapLike → MapLike → GenMapLike
   Annotations
     @migration
   Migration

     (Changed in version 2.8.0) `+` creates a new map. Use `+=` to add an element to this map and return that map itself.

5.  def ++[V1 >: B](xs: GenTraversableOnce[(A, V1)]): mutable.Map[A, V1]

   Creates a new map containing the key/value mappings provided by the specified traversable object and all the key/value mappings of this map.

   Creates a new map containing the key/value mappings provided by the specified traversable object and all the key/value mappings of this map.

   Note that existing mappings from this map with the same key as those in `xs` will be overridden.

   V1

     the type of the added values

   xs

     the traversable object.

   returns

     a new map containing mappings of this map and those provided by `xs`.

   Definition Classes
     MapLike → MapLike
   Annotations
     @migration
   Migration

     (Changed in version 2.8.0) `++` creates a new map. Use `++=` to add an element to this map and return that map itself.

6.  def ++[B >: (A, B), That](that: GenTraversableOnce[B])(implicit bf: CanBuildFrom[mutable.Map[A, B], B, That]): That

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

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

   B

     the element type of the returned collection.

   That

     the class of the returned collection. Where possible, `That` is the same class as the current collection class `Repr`, but this depends on the element type `B` being admissible for that class, which means that an implicit instance of type `CanBuildFrom[Repr, B, That]` is found.

   that

     the traversable to append.

   bf

     an implicit value of class `CanBuildFrom` which determines the result class `That` from the current representation type `Repr` and the new element type `B`.

   returns

     a new collection of type `That` which contains all elements of this traversable collection followed by all elements of `that`.

   Definition Classes
     TraversableLike → GenTraversableLike
7.  def ++:[B >: (A, B), That](that: Traversable[B])(implicit bf: CanBuildFrom[mutable.Map[A, B], B, That]): That

   As with `++`, returns a new collection containing the elements from the left operand followed by the elements from the right operand.

   As with `++`, returns a new collection containing the elements from the left operand followed by the elements from the right operand.

   It differs from `++` in that the right operand determines the type of the resulting collection rather than the left one. Mnemonic: the COLon is on the side of the new COLlection type.

   Example:

       scala> val x = List(1)
       x: List[Int] = List(1)

       scala> val y = LinkedList(2)
       y: scala.collection.mutable.LinkedList[Int] = LinkedList(2)

       scala> val z = x ++: y
       z: scala.collection.mutable.LinkedList[Int] = LinkedList(1, 2)

   This overload exists because: for the implementation of `++:` we should reuse that of `++` because many collections override it with more efficient versions.

   Since `TraversableOnce` has no `++` method, we have to implement that directly, but `Traversable` and down can use the overload.

   B

     the element type of the returned collection.

   That

     the class of the returned collection. Where possible, `That` is the same class as the current collection class `Repr`, but this depends on the element type `B` being admissible for that class, which means that an implicit instance of type `CanBuildFrom[Repr, B, That]` is found.

   that

     the traversable to append.

   bf

     an implicit value of class `CanBuildFrom` which determines the result class `That` from the current representation type `Repr` and the new element type `B`.

   returns

     a new collection of type `That` which contains all elements of this traversable collection followed by all elements of `that`.

   Definition Classes
     TraversableLike
8.  def ++:[B](that: TraversableOnce[B]): Map[B]

   [use case] As with `++`, returns a new collection containing the elements from the left operand followed by the elements from the right operand.

   [use case]

   As with `++`, returns a new collection containing the elements from the left operand followed by the elements from the right operand.

   It differs from `++` in that the right operand determines the type of the resulting collection rather than the left one. Mnemonic: the COLon is on the side of the new COLlection type.

   Example:

       scala> val x = List(1)
       x: List[Int] = List(1)

       scala> val y = LinkedList(2)
       y: scala.collection.mutable.LinkedList[Int] = LinkedList(2)

       scala> val z = x ++: y
       z: scala.collection.mutable.LinkedList[Int] = LinkedList(1, 2)

   B

     the element type of the returned collection.

   that

     the traversable to append.

   returns

     a new concurrent map which contains all elements of this concurrent map followed by all elements of `that`.

   Definition Classes
     TraversableLike
    Full Signature

   #### def ++:[B >: (A, B), That](that: TraversableOnce[B])(implicit bf: CanBuildFrom[mutable.Map[A, B], B, That]): That

9.  def ++=(xs: TraversableOnce[(A, B)]): Map.this.type

   adds all elements produced by a TraversableOnce to this growable collection.

   adds all elements produced by a TraversableOnce to this growable collection.

   xs

     the TraversableOnce producing the elements to add.

   returns

     the growable collection itself.

   Definition Classes
     Growable
10.  def +=(elem1: (A, B), elem2: (A, B), elems: (A, B)*): Map.this.type

    adds two or more elements to this growable collection.

    adds two or more elements to this growable collection.

    elem1

      the first element to add.

    elem2

      the second element to add.

    elems

      the remaining elements to add.

    returns

      the growable collection itself

    Definition Classes
      Growable
11.  def -(elem1: A, elem2: A, elems: A*): mutable.Map[A, B]

    Creates a new map with all the key/value mappings of this map except mappings with keys equal to any of the two or more specified keys.

    Creates a new map with all the key/value mappings of this map except mappings with keys equal to any of the two or more specified keys.

    elem1

      the first element to remove.

    elem2

      the second element to remove.

    elems

      the remaining elements to remove.

    returns

      a new map containing all the mappings of this map except mappings with a key equal to `elem1`, `elem2` or any of `elems`.

    Definition Classes
      MapLike → Subtractable
    Annotations
      @migration
    Migration

      (Changed in version 2.8.0) `-` creates a new map. Use `-=` to remove an element from this map and return that map itself.

12.  def -(key: A): mutable.Map[A, B]

    Creates a new map with all the key/value mappings of this map except the key/value mapping with the specified key.

    Creates a new map with all the key/value mappings of this map except the key/value mapping with the specified key.

    key

      the key to be removed

    returns

      a new map with all the mappings of this map except that with a key `key`.

    Definition Classes
      MapLike → MapLike → Subtractable → GenMapLike
    Annotations
      @migration
    Migration

      (Changed in version 2.8.0) `-` creates a new map. Use `-=` to remove an element from this map and return that map itself.

13.  def --(xs: GenTraversableOnce[A]): mutable.Map[A, B]

    Creates a new map with all the key/value mappings of this map except mappings with keys equal to any of those provided by the specified traversable object.

    Creates a new map with all the key/value mappings of this map except mappings with keys equal to any of those provided by the specified traversable object.

    xs

      the traversable object.

    returns

      a new map with all the key/value mappings of this map except mappings with a key equal to a key from `xs`.

    Definition Classes
      MapLike → Subtractable
    Annotations
      @migration
    Migration

      (Changed in version 2.8.0) `--` creates a new map. Use `--=` to remove an element from this map and return that map itself.

14.  def --=(xs: TraversableOnce[A]): Map.this.type

    Removes all elements produced by an iterator from this shrinkable collection.

    Removes all elements produced by an iterator from this shrinkable collection.

    xs

      the iterator producing the elements to remove.

    returns

      the shrinkable collection itself

    Definition Classes
      Shrinkable
15.  def -=(elem1: A, elem2: A, elems: A*): Map.this.type

    Removes two or more elements from this shrinkable collection.

    Removes two or more elements from this shrinkable collection.

    elem1

      the first element to remove.

    elem2

      the second element to remove.

    elems

      the remaining elements to remove.

    returns

      the shrinkable collection itself

    Definition Classes
      Shrinkable
16.  def ->[B](y: B): (Map[A, B], B)
    Implicit
      This member is added by an implicit conversion from Map[A, B] to ArrowAssoc[Map[A, B]] performed by method ArrowAssoc in scala.Predef.
    Definition Classes
      ArrowAssoc
    Annotations
      @inline()
17.  final def ==(arg0: Any): Boolean

    The expression `x == that` is equivalent to `if (x eq null) that eq null else x.equals(that)`.

    The expression `x == that` is equivalent to `if (x eq null) that eq null else x.equals(that)`.

    returns

      `true` if the receiver object is equivalent to the argument; `false` otherwise.

    Definition Classes
      AnyRef → Any
18.  def addString(b: StringBuilder, start: String, sep: String, end: String): StringBuilder

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

    Appends all bindings of this map 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 of all bindings of this map in the form of `key -> value` are separated by the string `sep`.

    b

      the builder to which strings are appended.

    start

      the starting string.

    sep

      the separator string.

    end

      the ending string.

    returns

      the string builder `b` to which elements were appended.

    Definition Classes
      MapLike → TraversableOnce
19.  def addString(b: StringBuilder): StringBuilder

    Appends all elements of this traversable or iterator to a string builder.

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

    Example:

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

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

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

    b

      the string builder to which elements are appended.

    returns

      the string builder `b` to which elements were appended.

    Definition Classes
      TraversableOnce
20.  def addString(b: StringBuilder, sep: String): StringBuilder

    Appends all elements of this traversable or iterator to a string builder using a separator string.

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

    Example:

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

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

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

    b

      the string builder to which elements are appended.

    sep

      the separator string.

    returns

      the string builder `b` to which elements were appended.

    Definition Classes
      TraversableOnce
21.  def aggregate[B](z: ⇒ B)(seqop: (B, (A, B)) ⇒ B, combop: (B, B) ⇒ B): B

    Aggregates the results of applying an operator to subsequent elements.

    Aggregates the results of applying an operator to subsequent elements.

    This is a more general form of `fold` and `reduce`. It is similar to `foldLeft` in that it doesn't require the result to be a supertype of the element type. In addition, it allows parallel collections to be processed in chunks, and then combines the intermediate results.

    `aggregate` splits the traversable or iterator into partitions and processes each partition by sequentially applying `seqop`, starting with `z` (like `foldLeft`). Those intermediate results are then combined by using `combop` (like `fold`). The implementation of this operation may operate on an arbitrary number of collection partitions (even 1), so `combop` may be invoked an arbitrary number of times (even 0).

    As an example, consider summing up the integer values of a list of chars. The initial value for the sum is 0. First, `seqop` transforms each input character to an Int and adds it to the sum (of the partition). Then, `combop` just needs to sum up the intermediate results of the partitions:

        List('a', 'b', 'c').aggregate(0)({ (sum, ch) => sum + ch.toInt }, { (p1, p2) => p1 + p2 })

    B

      the type of accumulated results

    z

      the initial value for the accumulated result of the partition - this will typically be the neutral element for the `seqop` operator (e.g. `Nil` for list concatenation or `0` for summation) and may be evaluated more than once

    seqop

      an operator used to accumulate results within a partition

    combop

      an associative operator used to combine results from different partitions

    Definition Classes
      TraversableOnce → GenTraversableOnce
22.  def andThen[C](k: (B) ⇒ C): PartialFunction[A, C]

    Composes this partial function with a transformation function that gets applied to results of this partial function.

    Composes this partial function with a transformation function that gets applied to results of this partial function.

    C

      the result type of the transformation function.

    k

      the transformation function

    returns

      a partial function with the same domain as this partial function, which maps arguments `x` to `k(this(x))`.

    Definition Classes
      PartialFunction → Function1
23.  def apply(key: A): B

    Retrieves the value which is associated with the given key.

    Retrieves the value which is associated with the given key. This method invokes the `default` method of the map if there is no mapping from the given key to a value. Unless overridden, the `default` method throws a `NoSuchElementException`.

    key

      the key

    returns

      the value associated with the given key, or the result of the map's `default` method, if none exists.

    Definition Classes
      MapLike → GenMapLike → Function1
24.  def applyOrElse[K1 <: A, V1 >: B](x: K1, default: (K1) ⇒ V1): V1

    Applies this partial function to the given argument when it is contained in the function domain.

    Applies this partial function to the given argument when it is contained in the function domain. Applies fallback function where this partial function is not defined.

    Note that expression `pf.applyOrElse(x, default)` is equivalent to

        if(pf isDefinedAt x) pf(x) else default(x)

    except that `applyOrElse` method can be implemented more efficiently. For all partial function literals the compiler generates an `applyOrElse` implementation which avoids double evaluation of pattern matchers and guards. This makes `applyOrElse` the basis for the efficient implementation for many operations and scenarios, such as:

    - combining partial functions into `orElse`/`andThen` chains does not lead to excessive `apply`/`isDefinedAt` evaluation
    - `lift` and `unlift` do not evaluate source functions twice on each invocation
    - `runWith` allows efficient imperative-style combining of partial functions with conditionally applied actions

    For non-literal partial function classes with nontrivial `isDefinedAt` method it is recommended to override `applyOrElse` with custom implementation that avoids double `isDefinedAt` evaluation. This may result in better performance and more predictable behavior w.r.t. side effects.

    x

      the function argument

    default

      the fallback function

    returns

      the result of this function or fallback function application.

    Definition Classes
      MapLike → PartialFunction
    Since

      2.10

25.  final def asInstanceOf[T0]: T0

    Cast the receiver object to be of type `T0`.

    Cast the receiver object to be of type `T0`.

    Note that the success of a cast at runtime is modulo Scala's erasure semantics. Therefore the expression `1.asInstanceOf[String]` will throw a `ClassCastException` at runtime, while the expression `List(1).asInstanceOf[List[String]]` will not. In the latter example, because the type argument is erased as part of compilation it is not possible to check whether the contents of the list are of the requested type.

    returns

      the receiver object.

    Definition Classes
      Any
    Exceptions thrown

      `ClassCastException` if the receiver object is not an instance of the erasure of type `T0`.

26.  def canEqual(that: Any): Boolean

    Method called from equality methods, so that user-defined subclasses can refuse to be equal to other collections of the same kind.

    Method called from equality methods, so that user-defined subclasses can refuse to be equal to other collections of the same kind.

    that

      The object with which this iterable collection should be compared

    returns

      `true`, if this iterable collection can possibly equal `that`, `false` otherwise. The test takes into consideration only the run-time types of objects but ignores their elements.

    Definition Classes
      IterableLike → Equals
27.  def clear(): Unit

    Removes all bindings from the map.

    Removes all bindings from the map. After this operation has completed, the map will be empty.

    Definition Classes
      MapLike → Builder → Growable → Clearable
28.  def clone(): mutable.Map[A, B]

    Create a copy of the receiver object.

    Create a copy of the receiver object.

    The default implementation of the `clone` method is platform dependent.

    returns

      a copy of the receiver object.

    Definition Classes
      MapLike → Cloneable → AnyRef
    Note

      not specified by SLS as a member of AnyRef

29.  def collect[B](pf: PartialFunction[A, B]): Map[B]

    [use case] Builds a new collection by applying a partial function to all elements of this concurrent map on which the function is defined.

    [use case]

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

    B

      the element type of the returned collection.

    pf

      the partial function which filters and maps the concurrent map.

    returns

      a new concurrent map 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
      TraversableLike → GenTraversableLike
     Full Signature

    #### def collect[B, That](pf: PartialFunction[(A, B), B])(implicit bf: CanBuildFrom[mutable.Map[A, B], B, That]): That

30.  def collectFirst[B](pf: PartialFunction[(A, B), B]): Option[B]

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

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

    Note: may not terminate for infinite-sized collections.

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

    pf

      the partial function

    returns

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

    Definition Classes
      TraversableOnce
    Example:

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

31.  def companion: GenericCompanion[mutable.Iterable]

    The factory companion object that builds instances of class Iterable.

    The factory companion object that builds instances of class Iterable. (or its `Iterable` superclass where class Iterable is not a `Seq`.)

    Definition Classes
      Iterable → Iterable → GenIterable → Traversable → Traversable → GenTraversable → GenericTraversableTemplate
32.  def compose[A](g: (A) ⇒ A): (A) ⇒ B

    Composes two instances of Function1 in a new Function1, with this function applied last.

    Composes two instances of Function1 in a new Function1, with this function applied last.

    A

      the type to which function `g` can be applied

    g

      a function A => T1

    returns

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

    Definition Classes
      Function1
    Annotations
      @unspecialized()
33.  def contains(key: A): Boolean

    Tests whether this map contains a binding for a key.

    Tests whether this map contains a binding for a key.

    key

      the key

    returns

      `true` if there is a binding for `key` in this map, `false` otherwise.

    Definition Classes
      MapLike → GenMapLike
34.  def copyToArray(xs: Array[A], start: Int, len: Int): Unit

    [use case] Copies the elements of this concurrent map to an array.

    [use case]

    Copies the elements of this concurrent map to an array. Fills the given array `xs` with at most `len` elements of this concurrent map, starting at position `start`. Copying will stop once either the end of the current concurrent map is reached, or the end of the target array is reached, or `len` elements have been copied.

    xs

      the array to fill.

    start

      the starting index.

    len

      the maximal number of elements to copy.

    Definition Classes
      IterableLike → TraversableLike → TraversableOnce → GenTraversableOnce
     Full Signature

    #### def copyToArray[B >: (A, B)](xs: Array[B], start: Int, len: Int): Unit

35.  def copyToArray(xs: Array[A]): Unit

    [use case] Copies the elements of this concurrent map to an array.

    [use case]

    Copies the elements of this concurrent map to an array. Fills the given array `xs` with values of this concurrent map. Copying will stop once either the end of the current concurrent map is reached, or the end of the target array is reached.

    xs

      the array to fill.

    Definition Classes
      TraversableOnce → GenTraversableOnce
     Full Signature

    #### def copyToArray[B >: (A, B)](xs: Array[B]): Unit

36.  def copyToArray(xs: Array[A], start: Int): Unit

    [use case] Copies the elements of this concurrent map to an array.

    [use case]

    Copies the elements of this concurrent map to an array. Fills the given array `xs` with values of this concurrent map, beginning at index `start`. Copying will stop once either the end of the current concurrent map is reached, or the end of the target array is reached.

    xs

      the array to fill.

    start

      the starting index.

    Definition Classes
      TraversableOnce → GenTraversableOnce
     Full Signature

    #### def copyToArray[B >: (A, B)](xs: Array[B], start: Int): Unit

37.  def copyToBuffer[B >: (A, B)](dest: Buffer[B]): Unit

    Copies all elements of this traversable or iterator to a buffer.

    Copies all elements of this traversable or iterator to a buffer.

    Note: will not terminate for infinite-sized collections.

    dest

      The buffer to which elements are copied.

    Definition Classes
      TraversableOnce
38.  def count(p: ((A, B)) ⇒ Boolean): Int

    Counts the number of elements in the traversable or iterator which satisfy a predicate.

    Counts the number of elements in the traversable or iterator which satisfy a predicate.

    p

      the predicate used to test elements.

    returns

      the number of elements satisfying the predicate `p`.

    Definition Classes
      TraversableOnce → GenTraversableOnce
39.  def default(key: A): B

    Defines the default value computation for the map, returned when a key is not found The method implemented here throws an exception, but it might be overridden in subclasses.

    Defines the default value computation for the map, returned when a key is not found The method implemented here throws an exception, but it might be overridden in subclasses.

    key

      the given key value for which a binding is missing.

    Definition Classes
      MapLike → GenMapLike
    Exceptions thrown
40.  def drop(n: Int): mutable.Map[A, B]

    Selects all elements except first n ones.

    Selects all elements except first n ones.

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

    n

      the number of elements to drop from this iterable collection.

    returns

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

    Definition Classes
      IterableLike → TraversableLike → GenTraversableLike
41.  def dropRight(n: Int): mutable.Map[A, B]

    Selects all elements except last n ones.

    Selects all elements except last n ones.

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

    n

      The number of elements to take

    returns

      a iterable collection consisting of all elements of this iterable collection except the last `n` ones, or else the empty iterable collection, if this iterable collection has less than `n` elements.

    Definition Classes
      IterableLike
42.  def dropWhile(p: ((A, B)) ⇒ Boolean): mutable.Map[A, B]

    Drops longest prefix of elements that satisfy a predicate.

    Drops longest prefix of elements that satisfy a predicate.

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

    returns

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

    Definition Classes
      TraversableLike → GenTraversableLike
43.  def empty: mutable.Map[A, B]

    The empty map of the same type as this map

    The empty map of the same type as this map

    returns

      an empty map of type `This`.

    Definition Classes
      Map → Map → MapLike
44.  def ensuring(cond: (Map[A, B]) ⇒ Boolean, msg: ⇒ Any): Map[A, B]
    Implicit
      This member is added by an implicit conversion from Map[A, B] to Ensuring[Map[A, B]] performed by method Ensuring in scala.Predef.
    Definition Classes
      Ensuring
45.  def ensuring(cond: (Map[A, B]) ⇒ Boolean): Map[A, B]
    Implicit
      This member is added by an implicit conversion from Map[A, B] to Ensuring[Map[A, B]] performed by method Ensuring in scala.Predef.
    Definition Classes
      Ensuring
46.  def ensuring(cond: Boolean, msg: ⇒ Any): Map[A, B]
    Implicit
      This member is added by an implicit conversion from Map[A, B] to Ensuring[Map[A, B]] performed by method Ensuring in scala.Predef.
    Definition Classes
      Ensuring
47.  def ensuring(cond: Boolean): Map[A, B]
    Implicit
      This member is added by an implicit conversion from Map[A, B] to Ensuring[Map[A, B]] performed by method Ensuring in scala.Predef.
    Definition Classes
      Ensuring
48.  final def eq(arg0: AnyRef): Boolean

    Tests whether the argument (`that`) is a reference to the receiver object (`this`).

    Tests whether the argument (`that`) is a reference to the receiver object (`this`).

    The `eq` method implements an equivalence relation on non-null instances of `AnyRef`, and has three additional properties:

    - It is consistent: for any non-null instances `x` and `y` of type `AnyRef`, multiple invocations of `x.eq(y)` consistently returns `true` or consistently returns `false`.
    - For any non-null instance `x` of type `AnyRef`, `x.eq(null)` and `null.eq(x)` returns `false`.
    - `null.eq(null)` returns `true`.

    When overriding the `equals` or `hashCode` methods, it is important to ensure that their behavior is consistent with reference equality. Therefore, if two objects are references to each other (`o1 eq o2`), they should be equal to each other (`o1 == o2`) and they should hash to the same value (`o1.hashCode == o2.hashCode`).

    returns

      `true` if the argument is a reference to the receiver object; `false` otherwise.

    Definition Classes
      AnyRef
49.  def equals(that: Any): Boolean

    Compares two maps structurally; i.e., checks if all mappings contained in this map are also contained in the other map, and vice versa.

    Compares two maps structurally; i.e., checks if all mappings contained in this map are also contained in the other map, and vice versa.

    that

      the other map

    returns

      `true` if both maps contain exactly the same mappings, `false` otherwise.

    Definition Classes
      GenMapLike → Equals → AnyRef → Any
50.  def exists(p: ((A, B)) ⇒ Boolean): Boolean

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

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

    Note: may not terminate for infinite-sized collections.

    p

      the predicate used to test elements.

    returns

      `false` if this iterable collection is empty, otherwise `true` if the given predicate `p` holds for some of the elements of this iterable collection, otherwise `false`

    Definition Classes
      IterableLike → TraversableLike → TraversableOnce → GenTraversableOnce
51.  def filter(p: ((A, B)) ⇒ Boolean): mutable.Map[A, B]

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

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

    p

      the predicate used to test elements.

    returns

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

    Definition Classes
      TraversableLike → GenTraversableLike
52.  def filterKeys(p: (A) ⇒ Boolean): collection.Map[A, B]

    Filters this map by retaining only keys satisfying a predicate.

    Filters this map by retaining only keys satisfying a predicate.

    Note: the predicate must accept any key of type `K`, not just those already present in the map, as the predicate is tested before the underlying map is queried.

    p

      the predicate used to test keys

    returns

      an immutable map consisting only of those key value pairs of this map where the key satisfies the predicate `p`. The resulting map wraps the original map without copying any elements.

    Definition Classes
      MapLike → GenMapLike
53.  def filterNot(p: ((A, B)) ⇒ Boolean): mutable.Map[A, B]

    Returns a new map obtained by removing all key/value pairs for which the predicate `p` returns `true`.

    Returns a new map obtained by removing all key/value pairs for which the predicate `p` returns `true`.

    Note: This method works by successively removing elements for which the predicate is true from this set. If removal is slow, or you expect that most elements of the set will be removed, you might consider using `filter` with a negated predicate instead.

    p

      A predicate over key-value pairs

    returns

      A new map containing elements not satisfying the predicate.

    Definition Classes
      MapLike → TraversableLike → GenTraversableLike
54.  def finalize(): Unit

    Called by the garbage collector on the receiver object when there are no more references to the object.

    Called by the garbage collector on the receiver object when there are no more references to the object.

    The details of when and if the `finalize` method is invoked, as well as the interaction between `finalize` and non-local returns and exceptions, are all platform dependent.

    Attributes
      protected[lang]
    Definition Classes
      AnyRef
    Annotations
      @throws( classOf[java.lang.Throwable] )
    Note

      not specified by SLS as a member of AnyRef

55.  def find(p: ((A, B)) ⇒ Boolean): Option[(A, B)]

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

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

    Note: may not terminate for infinite-sized collections.

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

    p

      the predicate used to test elements.

    returns

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

    Definition Classes
      IterableLike → TraversableLike → TraversableOnce → GenTraversableOnce
56.  def flatMap[B](f: (A) ⇒ GenTraversableOnce[B]): Map[B]

    [use case] Builds a new collection by applying a function to all elements of this concurrent map and using the elements of the resulting collections.

    [use case]

    Builds a new collection by applying a function to all elements of this concurrent map 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 concurrent map. This might cause unexpected results sometimes. For example:

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

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

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

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

    B

      the element type of the returned collection.

    f

      the function to apply to each element.

    returns

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

    Definition Classes
      TraversableLike → GenTraversableLike → FilterMonadic
     Full Signature

    #### def flatMap[B, That](f: ((A, B)) ⇒ GenTraversableOnce[B])(implicit bf: CanBuildFrom[mutable.Map[A, B], B, That]): That

57.  def flatten[B]: Map[B]

    [use case] Converts this concurrent map of traversable collections into a concurrent map formed by the elements of these traversable collections.

    [use case]

    Converts this concurrent map of traversable collections into a concurrent map formed by the elements of these traversable collections.

    The resulting collection's type will be guided by the static type of concurrent map. 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)

    B

      the type of the elements of each traversable collection.

    returns

      a new concurrent map resulting from concatenating all element concurrent maps.

    Definition Classes
      GenericTraversableTemplate
     Full Signature

    #### def flatten[B](implicit asTraversable: ((A, B)) ⇒ GenTraversableOnce[B]): mutable.Iterable[B]

58.  def fold[A1 >: (A, B)](z: A1)(op: (A1, A1) ⇒ A1): A1

    Folds the elements of this traversable or iterator using the specified associative binary operator.

    Folds the elements of this traversable or iterator using the specified associative binary operator.

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

    Note: will not terminate for infinite-sized collections.

    A1

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

    z

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

    op

      a binary operator that must be associative.

    returns

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

    Definition Classes
      TraversableOnce → GenTraversableOnce
59.  def foldLeft[B](z: B)(op: (B, (A, B)) ⇒ B): B

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

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

    Note: will not terminate for infinite-sized collections.

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

    B

      the result type of the binary operator.

    z

      the start value.

    op

      the binary operator.

    returns

      the result of inserting `op` between consecutive elements of this traversable or iterator, going left to right with the start value `z` on the left:

          op(...op(z, x_1), x_2, ..., x_n)

      where `x1, ..., xn` are the elements of this traversable or iterator. Returns `z` if this traversable or iterator is empty.

    Definition Classes
      TraversableOnce → GenTraversableOnce
60.  def foldRight[B](z: B)(op: ((A, B), B) ⇒ B): B

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

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

    Note: will not terminate for infinite-sized collections.

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

    B

      the result type of the binary operator.

    z

      the start value.

    op

      the binary operator.

    returns

      the result of inserting `op` between consecutive elements of this iterable collection, going right to left with the start value `z` on the right:

          op(x_1, op(x_2, ... op(x_n, z)...))

      where `x1, ..., xn` are the elements of this iterable collection. Returns `z` if this iterable collection is empty.

    Definition Classes
      IterableLike → TraversableOnce → GenTraversableOnce
61.  def forall(p: ((A, B)) ⇒ Boolean): Boolean

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

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

    Note: may not terminate for infinite-sized collections.

    p

      the predicate used to test elements.

    returns

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

    Definition Classes
      IterableLike → TraversableLike → TraversableOnce → GenTraversableOnce
62.  def foreach(f: ((A, B)) ⇒ Unit): Unit

    [use case] Applies a function `f` to all elements of this concurrent map.

    [use case]

    Applies a function `f` to all elements of this concurrent map.

    Note: this method underlies the implementation of most other bulk operations. Subclasses should re-implement this method if a more efficient implementation exists.

    f

      the function that is applied for its side-effect to every element. The result of function `f` is discarded.

    Definition Classes
      IterableLike → TraversableLike → GenTraversableLike → TraversableOnce → GenTraversableOnce → FilterMonadic
     Full Signature

    #### def foreach[U](f: ((A, B)) ⇒ U): Unit

63.  def genericBuilder[B]: Builder[B, mutable.Iterable[B]]

    The generic builder that builds instances of Traversable at arbitrary element types.

    The generic builder that builds instances of Traversable at arbitrary element types.

    Definition Classes
      GenericTraversableTemplate
64.  final def getClass(): Class[_]

    Returns the runtime class representation of the object.

    Returns the runtime class representation of the object.

    returns

      a class object corresponding to the runtime type of the receiver.

    Definition Classes
      AnyRef → Any
    Annotations
      @native()
65.  def getOrElse(key: A, default: ⇒ B): B

    [use case] Returns the value associated with a key, or a default value if the key is not contained in the map.

    [use case]

    Returns the value associated with a key, or a default value if the key is not contained in the map.

    key

      the key.

    default

      a computation that yields a default value in case no binding for `key` is found in the map.

    returns

      the value associated with `key` if it exists, otherwise the result of the `default` computation.

    Definition Classes
      MapLike → GenMapLike
     Full Signature

    #### def getOrElse[V1 >: B](key: A, default: ⇒ V1): V1

66.  def getOrElseUpdate(key: A, op: ⇒ B): B

    If given key is already in this map, returns associated value.

    If given key is already in this map, returns associated value.

    Otherwise, computes value from given expression `op`, stores with key in map and returns that value.

    Concurrent map implementations may evaluate the expression `op` multiple times, or may evaluate `op` without inserting the result.

    key

      the key to test

    op

      the computation yielding the value to associate with `key`, if `key` is previously unbound.

    returns

      the value associated with key (either previously or as a result of executing the method).

    Definition Classes
      Map → MapLike
67.  def groupBy[K](f: ((A, B)) ⇒ K): immutable.Map[K, mutable.Map[A, B]]

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

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

    Note: this method is not re-implemented by views. This means when applied to a view it will always force the view and return a new traversable collection.

    K

      the type of keys returned by the discriminator function.

    f

      the discriminator function.

    returns

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

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

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

    Definition Classes
      TraversableLike → GenTraversableLike
68.  def grouped(size: Int): Iterator[mutable.Map[A, B]]

    Partitions elements in fixed size iterable collections.

    Partitions elements in fixed size iterable collections.

    size

      the number of elements per group

    returns

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

    Definition Classes
      IterableLike
    See also

      scala.collection.Iterator, method `grouped`

69.  def hasDefiniteSize: Boolean

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

    Tests whether this traversable collection is known to have a finite size. All strict collections are known to have finite size. For a non-strict collection such as `Stream`, the predicate 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.

    returns

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

    Definition Classes
      TraversableLike → TraversableOnce → GenTraversableOnce
70.  def hashCode(): Int

    The hashCode method for reference types.

    The hashCode method for reference types. See hashCode in scala.Any.

    returns

      the hash code value for this object.

    Definition Classes
      GenMapLike → AnyRef → Any
71.  def head: (A, B)

    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.

    returns

      the first element of this iterable collection.

    Definition Classes
      IterableLike → TraversableLike → GenTraversableLike
    Exceptions thrown

      `NoSuchElementException` if the iterable collection is empty.

72.  def headOption: Option[(A, B)]

    Optionally selects the first element.

    Optionally selects the first element.

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

    returns

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

    Definition Classes
      TraversableLike → GenTraversableLike
73.  def init: mutable.Map[A, B]

    Selects all elements except the last.

    Selects all elements except the last.

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

    returns

      a traversable collection consisting of all elements of this traversable collection except the last one.

    Definition Classes
      TraversableLike → GenTraversableLike
    Exceptions thrown

      `UnsupportedOperationException` if the traversable collection is empty.

74.  def inits: Iterator[mutable.Map[A, B]]

    Iterates over the inits of this traversable collection.

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

    returns

      an iterator over all the inits of this traversable collection

    Definition Classes
      TraversableLike
    Example:

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

75.  def isDefinedAt(key: A): Boolean

    Tests whether this map contains a binding for a key.

    Tests whether this map contains a binding for a key. This method, which implements an abstract method of trait `PartialFunction`, is equivalent to `contains`.

    key

      the key

    returns

      `true` if there is a binding for `key` in this map, `false` otherwise.

    Definition Classes
      MapLike → GenMapLike → PartialFunction
76.  def isEmpty: Boolean

    Tests whether the map is empty.

    Tests whether the map is empty.

    returns

      `true` if the map does not contain any key/value binding, `false` otherwise.

    Definition Classes
      MapLike → IterableLike → TraversableLike → TraversableOnce → GenTraversableOnce
77.  final def isInstanceOf[T0]: Boolean

    Test whether the dynamic type of the receiver object is `T0`.

    Test whether the dynamic type of the receiver object is `T0`.

    Note that the result of the test is modulo Scala's erasure semantics. Therefore the expression `1.isInstanceOf[String]` will return `false`, while the expression `List(1).isInstanceOf[List[String]]` will return `true`. In the latter example, because the type argument is erased as part of compilation it is not possible to check whether the contents of the list are of the specified type.

    returns

      `true` if the receiver object is an instance of erasure of type `T0`; `false` otherwise.

    Definition Classes
      Any
78.  final def isTraversableAgain: Boolean

    Tests whether this traversable collection can be repeatedly traversed.

    Tests whether this traversable collection can be repeatedly traversed.

    returns

      `true`

    Definition Classes
      TraversableLike → GenTraversableLike → GenTraversableOnce
79.  def keySet: Set[A]

    Collects all keys of this map in a set.

    Collects all keys of this map in a set.

    returns

      a set containing all keys of this map.

    Definition Classes
      MapLike → GenMapLike
80.  def keys: Iterable[A]

    Collects all keys of this map in an iterable collection.

    Collects all keys of this map in an iterable collection.

    returns

      the keys of this map as an iterable.

    Definition Classes
      MapLike → GenMapLike
    Annotations
      @migration
    Migration

      (Changed in version 2.8.0) `keys` returns `Iterable[K]` rather than `Iterator[K]`.

81.  def keysIterator: Iterator[A]

    Creates an iterator for all keys.

    Creates an iterator for all keys.

    returns

      an iterator over all keys.

    Definition Classes
      MapLike → GenMapLike
82.  def last: (A, B)

    Selects the last element.

    Selects the last element.

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

    returns

      The last element of this traversable collection.

    Definition Classes
      TraversableLike → GenTraversableLike
    Exceptions thrown

      `NoSuchElementException` If the traversable collection is empty.

83.  def lastOption: Option[(A, B)]

    Optionally selects the last element.

    Optionally selects the last element.

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

    returns

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

    Definition Classes
      TraversableLike → GenTraversableLike
84.  def lift: (A) ⇒ Option[B]

    Turns this partial function into a plain function returning an `Option` result.

    Turns this partial function into a plain function returning an `Option` result.

    returns

      a function that takes an argument `x` to `Some(this(x))` if `this` is defined for `x`, and to `None` otherwise.

    Definition Classes
      PartialFunction
    See also

      Function.unlift

85.  def map[B](f: (A) ⇒ B): Map[B]

    [use case] Builds a new collection by applying a function to all elements of this concurrent map.

    [use case]

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

    B

      the element type of the returned collection.

    f

      the function to apply to each element.

    returns

      a new concurrent map resulting from applying the given function `f` to each element of this concurrent map and collecting the results.

    Definition Classes
      TraversableLike → GenTraversableLike → FilterMonadic
     Full Signature

    #### def map[B, That](f: ((A, B)) ⇒ B)(implicit bf: CanBuildFrom[mutable.Map[A, B], B, That]): That

86.  def mapResult[NewTo](f: (mutable.Map[A, B]) ⇒ NewTo): Builder[(A, B), NewTo]

    Creates a new builder by applying a transformation function to the results of this builder.

    Creates a new builder by applying a transformation function to the results of this builder.

    NewTo

      the type of collection returned by `f`.

    f

      the transformation function.

    returns

      a new builder which is the same as the current builder except that a transformation function is applied to this builder's result.

    Definition Classes
      Builder
    Note

      The original builder should no longer be used after `mapResult` is called.

87.  def mapValues[W](f: (B) ⇒ W): collection.Map[A, W]

    Transforms this map by applying a function to every retrieved value.

    Transforms this map by applying a function to every retrieved value.

    f

      the function used to transform values of this map.

    returns

      a map view which maps every key of this map to `f(this(key))`. The resulting map wraps the original map without copying any elements.

    Definition Classes
      MapLike → GenMapLike
88.  def max: A

    [use case] Finds the largest element.

    [use case]

    Finds the largest element.

    returns

      the largest element of this concurrent map.

    Definition Classes
      TraversableOnce → GenTraversableOnce
     Full Signature

    #### def max[B >: (A, B)](implicit cmp: Ordering[B]): (A, B)

    Exceptions thrown

      `UnsupportedOperationException` if this concurrent map is empty.

89.  def maxBy[B](f: (A) ⇒ B): A

    [use case] Finds the first element which yields the largest value measured by function f.

    [use case]

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

    B

      The result type of the function f.

    f

      The measuring function.

    returns

      the first element of this concurrent map with the largest value measured by function f.

    Definition Classes
      TraversableOnce → GenTraversableOnce
     Full Signature

    #### def maxBy[B](f: ((A, B)) ⇒ B)(implicit cmp: Ordering[B]): (A, B)

    Exceptions thrown

      `UnsupportedOperationException` if this concurrent map is empty.

90.  def min: A

    [use case] Finds the smallest element.

    [use case]

    Finds the smallest element.

    returns

      the smallest element of this concurrent map

    Definition Classes
      TraversableOnce → GenTraversableOnce
     Full Signature

    #### def min[B >: (A, B)](implicit cmp: Ordering[B]): (A, B)

    Exceptions thrown

      `UnsupportedOperationException` if this concurrent map is empty.

91.  def minBy[B](f: (A) ⇒ B): A

    [use case] Finds the first element which yields the smallest value measured by function f.

    [use case]

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

    B

      The result type of the function f.

    f

      The measuring function.

    returns

      the first element of this concurrent map with the smallest value measured by function f.

    Definition Classes
      TraversableOnce → GenTraversableOnce
     Full Signature

    #### def minBy[B](f: ((A, B)) ⇒ B)(implicit cmp: Ordering[B]): (A, B)

    Exceptions thrown

      `UnsupportedOperationException` if this concurrent map is empty.

92.  def mkString: String

    Displays all elements of this traversable or iterator in a string.

    Displays all elements of this traversable or iterator in a string.

    returns

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

    Definition Classes
      TraversableOnce → GenTraversableOnce
93.  def mkString(sep: String): String

    Displays all elements of this traversable or iterator in a string using a separator string.

    Displays all elements of this traversable or iterator in a string using a separator string.

    sep

      the separator string.

    returns

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

    Definition Classes
      TraversableOnce → GenTraversableOnce
    Example:

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

94.  def mkString(start: String, sep: String, end: String): String

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

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

    start

      the starting string.

    sep

      the separator string.

    end

      the ending string.

    returns

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

    Definition Classes
      TraversableOnce → GenTraversableOnce
    Example:

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

95.  final def ne(arg0: AnyRef): Boolean

    Equivalent to `!(this eq that)`.

    Equivalent to `!(this eq that)`.

    returns

      `true` if the argument is not a reference to the receiver object; `false` otherwise.

    Definition Classes
      AnyRef
96.  def newBuilder: Builder[(A, B), mutable.Map[A, B]]

    A common implementation of `newBuilder` for all mutable maps in terms of `empty`.

    A common implementation of `newBuilder` for all mutable maps in terms of `empty`.

    Overrides `MapLike` implementation for better efficiency.

    Attributes
      protected[this]
    Definition Classes
      MapLike → MapLike → TraversableLike → HasNewBuilder
97.  def nonEmpty: Boolean

    Tests whether the traversable or iterator is not empty.

    Tests whether the traversable or iterator is not empty.

    returns

      `true` if the traversable or iterator contains at least one element, `false` otherwise.

    Definition Classes
      TraversableOnce → GenTraversableOnce
98.  final def notify(): Unit

    Wakes up a single thread that is waiting on the receiver object's monitor.

    Wakes up a single thread that is waiting on the receiver object's monitor.

    Definition Classes
      AnyRef
    Annotations
      @native()
    Note

      not specified by SLS as a member of AnyRef

99.  final def notifyAll(): Unit

    Wakes up all threads that are waiting on the receiver object's monitor.

    Wakes up all threads that are waiting on the receiver object's monitor.

    Definition Classes
      AnyRef
    Annotations
      @native()
    Note

      not specified by SLS as a member of AnyRef

100.  def orElse[A1 <: A, B1 >: B](that: PartialFunction[A1, B1]): PartialFunction[A1, B1]

     Composes this partial function with a fallback partial function which gets applied where this partial function is not defined.

     Composes this partial function with a fallback partial function which gets applied where this partial function is not defined.

     A1

       the argument type of the fallback function

     B1

       the result type of the fallback function

     that

       the fallback function

     returns

       a partial function which has as domain the union of the domains of this partial function and `that`. The resulting partial function takes `x` to `this(x)` where `this` is defined, and to `that(x)` where it is not.

     Definition Classes
       PartialFunction
101.  def par: ParMap[A, B]

     Returns a parallel implementation of this collection.

     Returns a parallel implementation of this collection.

     For most collection types, this method creates a new parallel collection by copying all the elements. For these collection, `par` takes linear time. Mutable collections in this category do not produce a mutable parallel collection that has the same underlying dataset, so changes in one collection will not be reflected in the other one.

     Specific collections (e.g. `ParArray` or `mutable.ParHashMap`) override this default behaviour by creating a parallel collection which shares the same underlying dataset. For these collections, `par` takes constant or sublinear time.

     All parallel collections return a reference to themselves.

     returns

       a parallel implementation of this collection

     Definition Classes
       Parallelizable
102.  def parCombiner: Combiner[(A, B), ParMap[A, B]]

     The default `par` implementation uses the combiner provided by this method to create a new parallel collection.

     The default `par` implementation uses the combiner provided by this method to create a new parallel collection.

     returns

       a combiner for the parallel collection of type `ParRepr`

     Attributes
       protected[this]
     Definition Classes
       MapLike → MapLike → TraversableLike → Parallelizable
103.  def partition(p: ((A, B)) ⇒ Boolean): (mutable.Map[A, B], mutable.Map[A, B])

     Partitions this traversable collection in two traversable collections according to a predicate.

     Partitions this traversable collection in two traversable collections according to a predicate.

     p

       the predicate on which to partition.

     returns

       a pair of traversable collections: the first traversable collection consists of all elements that satisfy the predicate `p` and the second traversable collection consists of all elements that don't. The relative order of the elements in the resulting traversable collections is the same as in the original traversable collection.

     Definition Classes
       TraversableLike → GenTraversableLike
104.  def product: A

     [use case] Multiplies up the elements of this collection.

     [use case]

     Multiplies up the elements of this collection.

     returns

       the product of all elements in this concurrent map of numbers of type `Int`. Instead of `Int`, any other type `T` with an implicit `Numeric[T]` implementation can be used as element type of the concurrent map and as result type of `product`. Examples of such types are: `Long`, `Float`, `Double`, `BigInt`.

     Definition Classes
       TraversableOnce → GenTraversableOnce
      Full Signature

     #### def product[B >: (A, B)](implicit num: Numeric[B]): B

105.  def put(key: A, value: B): Option[B]

     Adds a new key/value pair to this map and optionally returns previously bound value.

     Adds a new key/value pair to this map and optionally returns previously bound value. If the map already contains a mapping for the key, it will be overridden by the new value.

     key

       the key to update

     value

       the new value

     returns

       an option value containing the value associated with the key before the `put` operation was executed, or `None` if `key` was not defined in the map before.

     Definition Classes
       MapLike
106.  def reduce[A1 >: (A, B)](op: (A1, A1) ⇒ A1): A1

     Reduces the elements of this traversable or iterator using the specified associative binary operator.

     Reduces the elements of this traversable or iterator using the specified associative binary operator.

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

     A1

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

     op

       A binary operator that must be associative.

     returns

       The result of applying reduce operator `op` between all the elements if the traversable or iterator is nonempty.

     Definition Classes
       TraversableOnce → GenTraversableOnce
     Exceptions thrown

       `UnsupportedOperationException` if this traversable or iterator is empty.

107.  def reduceLeft[B >: (A, B)](op: (B, (A, B)) ⇒ B): B

     Applies a binary operator to all elements of this traversable or iterator, going left to right.

     Applies a binary operator to all elements of this traversable or iterator, going left to right.

     Note: will not terminate for infinite-sized collections.

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

     B

       the result type of the binary operator.

     op

       the binary operator.

     returns

       the result of inserting `op` between consecutive elements of this traversable or iterator, going left to right:

           op( op( ... op(x_1, x_2) ..., x_{n-1}), x_n)

       where `x1, ..., xn` are the elements of this traversable or iterator.

     Definition Classes
       TraversableOnce
     Exceptions thrown

       `UnsupportedOperationException` if this traversable or iterator is empty.

108.  def reduceLeftOption[B >: (A, B)](op: (B, (A, B)) ⇒ B): Option[B]

     Optionally applies a binary operator to all elements of this traversable or iterator, going left to right.

     Optionally applies a binary operator to all elements of this traversable or iterator, going left to right.

     Note: will not terminate for infinite-sized collections.

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

     B

       the result type of the binary operator.

     op

       the binary operator.

     returns

       an option value containing the result of `reduceLeft(op)` if this traversable or iterator is nonempty, `None` otherwise.

     Definition Classes
       TraversableOnce → GenTraversableOnce
109.  def reduceOption[A1 >: (A, B)](op: (A1, A1) ⇒ A1): Option[A1]

     Reduces the elements of this traversable or iterator, if any, using the specified associative binary operator.

     Reduces the elements of this traversable or iterator, if any, using the specified associative binary operator.

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

     A1

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

     op

       A binary operator that must be associative.

     returns

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

     Definition Classes
       TraversableOnce → GenTraversableOnce
110.  def reduceRight[B >: (A, B)](op: ((A, B), B) ⇒ B): B

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

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

     Note: will not terminate for infinite-sized collections.

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

     B

       the result type of the binary operator.

     op

       the binary operator.

     returns

       the result of inserting `op` between consecutive elements of this iterable collection, going right to left:

           op(x_1, op(x_2, ..., op(x_{n-1}, x_n)...))

       where `x1, ..., xn` are the elements of this iterable collection.

     Definition Classes
       IterableLike → TraversableOnce → GenTraversableOnce
     Exceptions thrown

       `UnsupportedOperationException` if this iterable collection is empty.

111.  def reduceRightOption[B >: (A, B)](op: ((A, B), B) ⇒ B): Option[B]

     Optionally applies a binary operator to all elements of this traversable or iterator, going right to left.

     Optionally applies a binary operator to all elements of this traversable or iterator, going right to left.

     Note: will not terminate for infinite-sized collections.

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

     B

       the result type of the binary operator.

     op

       the binary operator.

     returns

       an option value containing the result of `reduceRight(op)` if this traversable or iterator is nonempty, `None` otherwise.

     Definition Classes
       TraversableOnce → GenTraversableOnce
112.  def remove(key: A): Option[B]

     Removes a key from this map, returning the value associated previously with that key as an option.

     Removes a key from this map, returning the value associated previously with that key as an option.

     key

       the key to be removed

     returns

       an option value containing the value associated previously with `key`, or `None` if `key` was not defined in the map before.

     Definition Classes
       MapLike
113.  def repr: mutable.Map[A, B]

     The collection of type traversable collection underlying this `TraversableLike` object.

     The collection of type traversable collection underlying this `TraversableLike` object. By default this is implemented as the `TraversableLike` object itself, but this can be overridden.

     Definition Classes
       TraversableLike → GenTraversableLike
114.  def result(): mutable.Map[A, B]

     The result when this map is used as a builder

     The result when this map is used as a builder

     returns

       the map representation itself.

     Definition Classes
       MapLike → Builder
115.  def retain(p: (A, B) ⇒ Boolean): Map.this.type

     Retains only those mappings for which the predicate `p` returns `true`.

     Retains only those mappings for which the predicate `p` returns `true`.

     p

       The test predicate

     Definition Classes
       MapLike
116.  def reversed: List[(A, B)]
     Attributes
       protected[this]
     Definition Classes
       TraversableOnce
117.  def runWith[U](action: (B) ⇒ U): (A) ⇒ Boolean

     Composes this partial function with an action function which gets applied to results of this partial function.

     Composes this partial function with an action function which gets applied to results of this partial function. The action function is invoked only for its side effects; its result is ignored.

     Note that expression `pf.runWith(action)(x)` is equivalent to

         if(pf isDefinedAt x) { action(pf(x)); true } else false

     except that `runWith` is implemented via `applyOrElse` and thus potentially more efficient. Using `runWith` avoids double evaluation of pattern matchers and guards for partial function literals.

     action

       the action function

     returns

       a function which maps arguments `x` to `isDefinedAt(x)`. The resulting function runs `action(this(x))` where `this` is defined.

     Definition Classes
       PartialFunction
     Since

       2.10

     See also

       `applyOrElse`.

118.  def sameElements(that: GenIterable[A]): Boolean

     [use case] Checks if the other iterable collection contains the same elements in the same order as this concurrent map.

     [use case]

     Checks if the other iterable collection contains the same elements in the same order as this concurrent map.

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

     that

       the collection to compare with.

     returns

       `true`, if both collections contain the same elements in the same order, `false` otherwise.

     Definition Classes
       IterableLike → GenIterableLike
      Full Signature

     #### def sameElements[B >: (A, B)](that: GenIterable[B]): Boolean

119.  def scan[B >: (A, B), That](z: B)(op: (B, B) ⇒ B)(implicit cbf: CanBuildFrom[mutable.Map[A, B], B, That]): That

     Computes a prefix scan of the elements of the collection.

     Computes a prefix scan of the elements of the collection.

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

     B

       element type of the resulting collection

     That

       type of the resulting collection

     z

       neutral element for the operator `op`

     op

       the associative operator for the scan

     cbf

       combiner factory which provides a combiner

     returns

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

     Definition Classes
       TraversableLike → GenTraversableLike
120.  def scanLeft[B, That](z: B)(op: (B, (A, B)) ⇒ B)(implicit bf: CanBuildFrom[mutable.Map[A, B], B, That]): That

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

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

     Note: will not terminate for infinite-sized collections.

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

     B

       the type of the elements in the resulting collection

     That

       the actual type of the resulting collection

     z

       the initial value

     op

       the binary operator applied to the intermediate result and the element

     bf

       an implicit value of class `CanBuildFrom` which determines the result class `That` from the current representation type `Repr` and the new element type `B`.

     returns

       collection with intermediate results

     Definition Classes
       TraversableLike → GenTraversableLike
121.  def scanRight[B, That](z: B)(op: ((A, B), B) ⇒ B)(implicit bf: CanBuildFrom[mutable.Map[A, B], B, That]): That

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

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

     Note: will not terminate for infinite-sized collections.

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

     Example:

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

     B

       the type of the elements in the resulting collection

     That

       the actual type of the resulting collection

     z

       the initial value

     op

       the binary operator applied to the intermediate result and the element

     bf

       an implicit value of class `CanBuildFrom` which determines the result class `That` from the current representation type `Repr` and the new element type `B`.

     returns

       collection with intermediate results

     Definition Classes
       TraversableLike → GenTraversableLike
     Annotations
       @migration
     Migration

       (Changed in version 2.9.0) The behavior of `scanRight` has changed. The previous behavior can be reproduced with scanRight.reverse.

122.  def seq: mutable.Map[A, B]

     A version of this collection with all of the operations implemented sequentially (i.e., in a single-threaded manner).

     A version of this collection with all of the operations implemented sequentially (i.e., in a single-threaded manner).

     This method returns a reference to this collection. In parallel collections, it is redefined to return a sequential implementation of this collection. In both cases, it has O(1) complexity.

     returns

       a sequential view of the collection.

     Definition Classes
       Map → Map → GenMap → GenMapLike → Iterable → Iterable → GenIterable → Traversable → Traversable → GenTraversable → Parallelizable → TraversableOnce → GenTraversableOnce
123.  def size: Int

     The size of this traversable or iterator.

     The size of this traversable or iterator.

     Note: will not terminate for infinite-sized collections.

     returns

       the number of elements in this traversable or iterator.

     Definition Classes
       TraversableOnce → GenTraversableOnce
124.  def sizeHint(coll: TraversableLike[_, _], delta: Int): Unit

     Gives a hint that one expects the `result` of this builder to have the same size as the given collection, plus some delta.

     Gives a hint that one expects the `result` of this builder to have the same size as the given collection, plus some delta. This will provide a hint only if the collection is known to have a cheap `size` method. Currently this is assumed to be the case if and only if the collection is of type `IndexedSeqLike`. Some builder classes will optimize their representation based on the hint. However, builder implementations are still required to work correctly even if the hint is wrong, i.e. a different number of elements is added.

     coll

       the collection which serves as a hint for the result's size.

     delta

       a correction to add to the `coll.size` to produce the size hint.

     Definition Classes
       Builder
125.  def sizeHint(coll: TraversableLike[_, _]): Unit

     Gives a hint that one expects the `result` of this builder to have the same size as the given collection, plus some delta.

     Gives a hint that one expects the `result` of this builder to have the same size as the given collection, plus some delta. This will provide a hint only if the collection is known to have a cheap `size` method, which is determined by calling `sizeHint`.

     Some builder classes will optimize their representation based on the hint. However, builder implementations are still required to work correctly even if the hint is wrong, i.e. a different number of elements is added.

     coll

       the collection which serves as a hint for the result's size.

     Definition Classes
       Builder
126.  def sizeHint(size: Int): Unit

     Gives a hint how many elements are expected to be added when the next `result` is called.

     Gives a hint how many elements are expected to be added when the next `result` is called. Some builder classes will optimize their representation based on the hint. However, builder implementations are still required to work correctly even if the hint is wrong, i.e. a different number of elements is added.

     size

       the hint how many elements will be added.

     Definition Classes
       Builder
127.  def sizeHintBounded(size: Int, boundingColl: TraversableLike[_, _]): Unit

     Gives a hint how many elements are expected to be added when the next `result` is called, together with an upper bound given by the size of some other collection.

     Gives a hint how many elements are expected to be added when the next `result` is called, together with an upper bound given by the size of some other collection. Some builder classes will optimize their representation based on the hint. However, builder implementations are still required to work correctly even if the hint is wrong, i.e. a different number of elements is added.

     size

       the hint how many elements will be added.

     boundingColl

       the bounding collection. If it is an IndexedSeqLike, then sizes larger than collection's size are reduced.

     Definition Classes
       Builder
128.  def sizeHintIfCheap: Int

     The size of this collection or iterator, if it can be cheaply computed

     The size of this collection or iterator, if it can be cheaply computed

     returns

       the number of elements in this collection or iterator, or -1 if the size cannot be determined cheaply

     Attributes
       protected[collection]
     Definition Classes
       GenTraversableOnce
129.  def slice(from: Int, until: Int): mutable.Map[A, B]

     Selects an interval of elements.

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

         from <= indexOf(x) < until

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

     returns

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

     Definition Classes
       IterableLike → TraversableLike → GenTraversableLike
130.  def sliding(size: Int, step: Int): Iterator[mutable.Map[A, B]]

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

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

     size

       the number of elements per group

     step

       the distance between the first elements of successive groups

     returns

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

     Definition Classes
       IterableLike
     See also

       scala.collection.Iterator, method `sliding`

131.  def sliding(size: Int): Iterator[mutable.Map[A, B]]

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

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

     size

       the number of elements per group

     returns

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

     Definition Classes
       IterableLike
     See also

       scala.collection.Iterator, method `sliding`

132.  def span(p: ((A, B)) ⇒ Boolean): (mutable.Map[A, B], mutable.Map[A, B])

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

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

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

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

     returns

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

     Definition Classes
       TraversableLike → GenTraversableLike
133.  def splitAt(n: Int): (mutable.Map[A, B], mutable.Map[A, B])

     Splits this traversable collection into two at a given position.

     Splits this traversable collection into two at a given position. Note: `c splitAt n` is equivalent to (but possibly more efficient than) `(c take n, c drop n)`.

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

     n

       the position at which to split.

     returns

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

     Definition Classes
       TraversableLike → GenTraversableLike
134.  def stringPrefix: String

     Defines the prefix of this object's `toString` representation.

     Defines the prefix of this object's `toString` representation.

     returns

       a string representation which starts the result of `toString` applied to this map. Unless overridden in subclasses, the string prefix of every map is `"Map"`.

     Definition Classes
       MapLike → TraversableLike → GenTraversableLike
135.  def sum: A

     [use case] Sums up the elements of this collection.

     [use case]

     Sums up the elements of this collection.

     returns

       the sum of all elements in this concurrent map of numbers of type `Int`. Instead of `Int`, any other type `T` with an implicit `Numeric[T]` implementation can be used as element type of the concurrent map and as result type of `sum`. Examples of such types are: `Long`, `Float`, `Double`, `BigInt`.

     Definition Classes
       TraversableOnce → GenTraversableOnce
      Full Signature

     #### def sum[B >: (A, B)](implicit num: Numeric[B]): B

136.  final def synchronized[T0](arg0: ⇒ T0): T0
     Definition Classes
       AnyRef
137.  def tail: mutable.Map[A, B]

     Selects all elements except the first.

     Selects all elements except the first.

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

     returns

       a traversable collection consisting of all elements of this traversable collection except the first one.

     Definition Classes
       TraversableLike → GenTraversableLike
     Exceptions thrown

       `java.lang.UnsupportedOperationException` if the traversable collection is empty.

138.  def tails: Iterator[mutable.Map[A, B]]

     Iterates over the tails of this traversable collection.

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

     returns

       an iterator over all the tails of this traversable collection

     Definition Classes
       TraversableLike
     Example:

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

139.  def take(n: Int): mutable.Map[A, B]

     Selects first n elements.

     Selects first n elements.

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

     n

       the number of elements to take from this iterable collection.

     returns

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

     Definition Classes
       IterableLike → TraversableLike → GenTraversableLike
140.  def takeRight(n: Int): mutable.Map[A, B]

     Selects last n elements.

     Selects last n elements.

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

     n

       the number of elements to take

     returns

       a iterable collection consisting only of the last `n` elements of this iterable collection, or else the whole iterable collection, if it has less than `n` elements.

     Definition Classes
       IterableLike
141.  def takeWhile(p: ((A, B)) ⇒ Boolean): mutable.Map[A, B]

     Takes longest prefix of elements that satisfy a predicate.

     Takes longest prefix of elements that satisfy a predicate.

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

     returns

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

     Definition Classes
       IterableLike → TraversableLike → GenTraversableLike
142.  def thisCollection: Iterable[(A, B)]

     The underlying collection seen as an instance of `Iterable`.

     The underlying collection seen as an instance of `Iterable`. By default this is implemented as the current collection object itself, but this can be overridden.

     Attributes
       protected[this]
     Definition Classes
       IterableLike → TraversableLike
143.  def to[Col[_]]: Col[A]

     [use case] Converts this concurrent map into another by copying all elements.

     [use case]

     Converts this concurrent map into another by copying all elements.

     Col

       The collection type to build.

     returns

       a new collection containing all elements of this concurrent map.

     Definition Classes
       TraversableLike → TraversableOnce → GenTraversableOnce
      Full Signature

     #### def to[Col[_]](implicit cbf: CanBuildFrom[Nothing, (A, B), Col[(A, B)]]): Col[(A, B)]

144.  def toArray: Array[A]

     [use case] Converts this concurrent map to an array.

     [use case]

     Converts this concurrent map to an array.

     returns

       an array containing all elements of this concurrent map. An `ClassTag` must be available for the element type of this concurrent map.

     Definition Classes
       TraversableOnce → GenTraversableOnce
      Full Signature

     #### def toArray[B >: (A, B)](implicit arg0: ClassTag[B]): Array[B]

145.  def toBuffer[E >: (A, B)]: Buffer[E]

     Uses the contents of this map to create a new mutable buffer.

     Uses the contents of this map to create a new mutable buffer.

     returns

       a buffer containing all elements of this map.

     Definition Classes
       MapLike → TraversableOnce → GenTraversableOnce
146.  def toCollection(repr: mutable.Map[A, B]): Iterable[(A, B)]

     A conversion from collections of type `Repr` to `Iterable` objects.

     A conversion from collections of type `Repr` to `Iterable` objects. By default this is implemented as just a cast, but this can be overridden.

     Attributes
       protected[this]
     Definition Classes
       IterableLike → TraversableLike
147.  def toIndexedSeq: immutable.IndexedSeq[(A, B)]

     Converts this traversable or iterator to an indexed sequence.

     Converts this traversable or iterator to an indexed sequence.

     Note: will not terminate for infinite-sized collections.

     returns

       an indexed sequence containing all elements of this traversable or iterator.

     Definition Classes
       TraversableOnce → GenTraversableOnce
148.  def toIterable: Iterable[(A, B)]

     Returns this iterable collection as an iterable collection.

     Returns this iterable collection as an iterable collection.

     A new collection will not be built; lazy collections will stay lazy.

     Note: will not terminate for infinite-sized collections.

     returns

       an `Iterable` containing all elements of this iterable collection.

     Definition Classes
       IterableLike → TraversableOnce → GenTraversableOnce
149.  def toIterator: Iterator[(A, B)]

     Returns an Iterator over the elements in this iterable collection.

     Returns an Iterator over the elements in this iterable collection. Produces the same result as `iterator`.

     Note: will not terminate for infinite-sized collections.

     returns

       an Iterator containing all elements of this iterable collection.

     Definition Classes
       IterableLike → TraversableLike → GenTraversableOnce
     Annotations
       @deprecatedOverriding( message = ... , since = "2.11.0" )
150.  def toList: List[(A, B)]

     Converts this traversable or iterator to a list.

     Converts this traversable or iterator to a list.

     Note: will not terminate for infinite-sized collections.

     returns

       a list containing all elements of this traversable or iterator.

     Definition Classes
       TraversableOnce → GenTraversableOnce
151.  def toMap[T, U]: collection.Map[T, U]

     [use case] Converts this concurrent map to a map.

     [use case]

     Converts this concurrent map to a map. This method is unavailable unless the elements are members of Tuple2, each ((T, U)) becoming a key-value pair in the map. Duplicate keys will be overwritten by later keys: if this is an unordered collection, which key is in the resulting map is undefined.

     returns

       a map of type `immutable.Map[T, U]` containing all key/value pairs of type `(T, U)` of this concurrent map.

     Definition Classes
       TraversableOnce → GenTraversableOnce
      Full Signature

     #### def toMap[T, U](implicit ev: <:<[(A, B), (T, U)]): immutable.Map[T, U]

152.  def toParArray: ParArray[T]
     Implicit
       This member is added by an implicit conversion from Map[A, B] to CollectionsHaveToParArray[Map[A, B], T] performed by method CollectionsHaveToParArray in scala.collection.parallel. This conversion will take place only if an implicit value of type (Map[A, B]) ⇒ GenTraversableOnce[T] is in scope.
     Definition Classes
       CollectionsHaveToParArray
153.  def toSeq: Seq[(A, B)]

     Converts this mutable map to a sequence.

     Converts this mutable map to a sequence.

     ```Note```: assumes a fast `size` method. Subclasses should override if this is not true.

     returns

       a sequence containing all elements of this mutable map.

     Definition Classes
       MapLike → MapLike → TraversableOnce → GenTraversableOnce
154.  def toSet[B >: (A, B)]: immutable.Set[B]

     Converts this traversable or iterator to a set.

     Converts this traversable or iterator to a set.

     Note: will not terminate for infinite-sized collections.

     returns

       a set containing all elements of this traversable or iterator.

     Definition Classes
       TraversableOnce → GenTraversableOnce
155.  def toStream: immutable.Stream[(A, B)]

     Converts this iterable collection to a stream.

     Converts this iterable collection to a stream.

     returns

       a stream containing all elements of this iterable collection.

     Definition Classes
       IterableLike → TraversableLike → GenTraversableOnce
156.  def toString(): String

     Converts this map to a string.

     Converts this map to a string.

     returns

       a string representation of this collection. By default this string consists of the `stringPrefix` of this map, followed by all elements separated by commas and enclosed in parentheses.

     Definition Classes
       MapLike → TraversableLike → Function1 → AnyRef → Any
157.  def toTraversable: Traversable[(A, B)]

     Converts this traversable collection to an unspecified Traversable.

     Converts this traversable collection to an unspecified Traversable. Will return the same collection if this instance is already Traversable.

     Note: will not terminate for infinite-sized collections.

     returns

       a Traversable containing all elements of this traversable collection.

     Definition Classes
       TraversableLike → TraversableOnce → GenTraversableOnce
     Annotations
       @deprecatedOverriding( message = ... , since = "2.11.0" )
158.  def toVector: Vector[(A, B)]

     Converts this traversable or iterator to a Vector.

     Converts this traversable or iterator to a Vector.

     Note: will not terminate for infinite-sized collections.

     returns

       a vector containing all elements of this traversable or iterator.

     Definition Classes
       TraversableOnce → GenTraversableOnce
159.  def transform(f: (A, B) ⇒ B): Map.this.type

     Applies a transformation function to all values contained in this map.

     Applies a transformation function to all values contained in this map. The transformation function produces new values from existing keys associated values.

     f

       the transformation to apply

     returns

       the map itself.

     Definition Classes
       MapLike
160.  def transpose[B](implicit asTraversable: ((A, B)) ⇒ GenTraversableOnce[B]): mutable.Iterable[mutable.Iterable[B]]

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

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

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

         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))

     B

       the type of the elements of each traversable collection.

     asTraversable

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

     returns

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

     Definition Classes
       GenericTraversableTemplate
     Annotations
       @migration
     Migration

       (Changed in version 2.9.0) `transpose` throws an `IllegalArgumentException` if collections are not uniformly sized.

     Exceptions thrown

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

161.  def unzip[A1, A2](implicit asPair: ((A, B)) ⇒ (A1, A2)): (mutable.Iterable[A1], mutable.Iterable[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 = Traversable(
                    (1, "one"),
                    (2, "two"),
                    (3, "three")).unzip
         // xs == (Traversable(1, 2, 3),
         //        Traversable(one, two, three))

     A1

       the type of the first half of the element pairs

     A2

       the type of the second half of the element pairs

     asPair

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

     returns

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

     Definition Classes
       GenericTraversableTemplate
162.  def unzip3[A1, A2, A3](implicit asTriple: ((A, B)) ⇒ (A1, A2, A3)): (mutable.Iterable[A1], mutable.Iterable[A2], mutable.Iterable[A3])

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

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

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

     A1

       the type of the first member of the element triples

     A2

       the type of the second member of the element triples

     A3

       the type of the third member of the element triples

     asTriple

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

     returns

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

     Definition Classes
       GenericTraversableTemplate
163.  def update(key: A, value: B): Unit

     Adds a new key/value pair to this map.

     Adds a new key/value pair to this map. If the map already contains a mapping for the key, it will be overridden by the new value.

     key

       The key to update

     value

       The new value

     Definition Classes
       MapLike
164.  def updated[V1 >: B](key: A, value: V1): mutable.Map[A, V1]

     Creates a new map consisting of all key/value pairs of the current map plus a new pair of a given key and value.

     Creates a new map consisting of all key/value pairs of the current map plus a new pair of a given key and value.

     V1

       the type of the added value

     key

       The key to add

     value

       The new value

     returns

       A fresh immutable map with the binding from `key` to `value` added to this map.

     Definition Classes
       MapLike → MapLike
165.  def values: Iterable[B]

     Collects all values of this map in an iterable collection.

     Collects all values of this map in an iterable collection.

     returns

       the values of this map as an iterable.

     Definition Classes
       MapLike → GenMapLike
     Annotations
       @migration
     Migration

       (Changed in version 2.8.0) `values` returns `Iterable[V]` rather than `Iterator[V]`.

166.  def valuesIterator: Iterator[B]

     Creates an iterator for all values in this map.

     Creates an iterator for all values in this map.

     returns

       an iterator over all values that are associated with some key in this map.

     Definition Classes
       MapLike → GenMapLike
167.  def view(from: Int, until: Int): IterableView[(A, B), mutable.Map[A, B]]

     Creates a non-strict view of a slice of this iterable collection.

     Creates a non-strict view of a slice of this iterable collection.

     Note: the difference between `view` and `slice` is that `view` produces a view of the current iterable collection, whereas `slice` produces a new iterable collection.

     Note: `view(from, to)` is equivalent to `view.slice(from, to)`

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

     from

       the index of the first element of the view

     until

       the index of the element following the view

     returns

       a non-strict view of a slice of this iterable collection, starting at index `from` and extending up to (but not including) index `until`.

     Definition Classes
       IterableLike → TraversableLike
168.  def view: IterableView[(A, B), mutable.Map[A, B]]

     Creates a non-strict view of this iterable collection.

     Creates a non-strict view of this iterable collection.

     returns

       a non-strict view of this iterable collection.

     Definition Classes
       IterableLike → TraversableLike
169.  final def wait(): Unit
     Definition Classes
       AnyRef
     Annotations
       @throws( ... )
170.  final def wait(arg0: Long, arg1: Int): Unit
     Definition Classes
       AnyRef
     Annotations
       @throws( ... )
171.  final def wait(arg0: Long): Unit
     Definition Classes
       AnyRef
     Annotations
       @throws( ... ) @native()
172.  def withDefault(d: (A) ⇒ B): mutable.Map[A, B]

     The same map with a given default function.

     The same map with a given default function.

     Invoking transformer methods (e.g. `map`) will not preserve the default value.

     d

       the function mapping keys to values, used for non-present keys

     returns

       a wrapper of the map with a default value

     Definition Classes
       Map
173.  def withDefaultValue(d: B): mutable.Map[A, B]

     The same map with a given default value.

     The same map with a given default value.

     Invoking transformer methods (e.g. `map`) will not preserve the default value.

     d

       default value used for non-present keys

     returns

       a wrapper of the map with a default value

     Definition Classes
       Map
174.  def withFilter(p: ((A, B)) ⇒ Boolean): FilterMonadic[(A, B), mutable.Map[A, B]]

     Creates a non-strict filter of this traversable collection.

     Creates a non-strict filter of this traversable collection.

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

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

     p

       the predicate used to test elements.

     returns

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

     Definition Classes
       TraversableLike → FilterMonadic
175.  def zip[B](that: GenIterable[B]): Map[(A, B)]

     [use case] Returns a concurrent map formed from this concurrent map and another iterable collection by combining corresponding elements in pairs.

     [use case]

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

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

     B

       the type of the second half of the returned pairs

     that

       The iterable providing the second half of each result pair

     returns

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

     Definition Classes
       IterableLike → GenIterableLike
      Full Signature

     #### def zip[A1 >: (A, B), B, That](that: GenIterable[B])(implicit bf: CanBuildFrom[mutable.Map[A, B], (A1, B), That]): That

176.  def zipAll[B](that: Iterable[B], thisElem: A, thatElem: B): Map[(A, B)]

     [use case] Returns a concurrent map formed from this concurrent map and another iterable collection by combining corresponding elements in pairs.

     [use case]

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

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

     B

       the type of the second half of the returned pairs

     that

       The iterable providing the second half of each result pair

     thisElem

       the element to be used to fill up the result if this concurrent map is shorter than `that`.

     thatElem

       the element to be used to fill up the result if `that` is shorter than this concurrent map.

     returns

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

     Definition Classes
       IterableLike → GenIterableLike
      Full Signature

     #### def zipAll[B, A1 >: (A, B), That](that: GenIterable[B], thisElem: A1, thatElem: B)(implicit bf: CanBuildFrom[mutable.Map[A, B], (A1, B), That]): That

177.  def zipWithIndex: Map[(A, Int)]

     [use case] Zips this concurrent map with its indices.

     [use case]

     Zips this concurrent map with its indices.

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

     returns

       A new concurrent map containing pairs consisting of all elements of this concurrent map paired with their index. Indices start at `0`.

     Definition Classes
       IterableLike → GenIterableLike
      Full Signature

     #### def zipWithIndex[A1 >: (A, B), That](implicit bf: CanBuildFrom[mutable.Map[A, B], (A1, Int), That]): That

     Example:

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

178.  def →[B](y: B): (Map[A, B], B)
     Implicit
       This member is added by an implicit conversion from Map[A, B] to ArrowAssoc[Map[A, B]] performed by method ArrowAssoc in scala.Predef.
     Definition Classes
       ArrowAssoc

### Shadowed Implicit Value Members

1.  def +(other: String): String
   Implicit
     This member is added by an implicit conversion from Map[A, B] to any2stringadd[Map[A, B]] performed by method any2stringadd in scala.Predef.
   Shadowing
     This implicitly inherited member is shadowed by one or more members in this class.
     To access this member you can use a type ascription:

         (map: any2stringadd[Map[A, B]]).+(other)

   Definition Classes
     any2stringadd
2.  def filter(p: ((A, B)) ⇒ Boolean): TraversableOnce[(A, B)]
   Implicit
     This member is added by an implicit conversion from Map[A, B] to MonadOps[(A, B)] performed by method MonadOps in scala.collection.TraversableOnce.
   Shadowing
     This implicitly inherited member is shadowed by one or more members in this class.
     To access this member you can use a type ascription:

         (map: MonadOps[(A, B)]).filter(p)

   Definition Classes
     MonadOps
3.  def flatMap[B](f: ((A, B)) ⇒ GenTraversableOnce[B]): TraversableOnce[B]
   Implicit
     This member is added by an implicit conversion from Map[A, B] to MonadOps[(A, B)] performed by method MonadOps in scala.collection.TraversableOnce.
   Shadowing
     This implicitly inherited member is shadowed by one or more members in this class.
     To access this member you can use a type ascription:

         (map: MonadOps[(A, B)]).flatMap(f)

   Definition Classes
     MonadOps
4.  def map[B](f: ((A, B)) ⇒ B): TraversableOnce[B]
   Implicit
     This member is added by an implicit conversion from Map[A, B] to MonadOps[(A, B)] performed by method MonadOps in scala.collection.TraversableOnce.
   Shadowing
     This implicitly inherited member is shadowed by one or more members in this class.
     To access this member you can use a type ascription:

         (map: MonadOps[(A, B)]).map(f)

   Definition Classes
     MonadOps
5.  def withFilter(p: ((A, B)) ⇒ Boolean): Iterator[(A, B)]
   Implicit
     This member is added by an implicit conversion from Map[A, B] to MonadOps[(A, B)] performed by method MonadOps in scala.collection.TraversableOnce.
   Shadowing
     This implicitly inherited member is shadowed by one or more members in this class.
     To access this member you can use a type ascription:

         (map: MonadOps[(A, B)]).withFilter(p)

   Definition Classes
     MonadOps

### Deprecated Value Members

1.  def /:[B](z: B)(op: (B, (A, B)) ⇒ B): B

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

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

   Note: `/:` is alternate syntax for `foldLeft`; `z /: xs` is the same as `xs foldLeft z`.

   Examples:

   Note that the folding function used to compute b is equivalent to that used to compute c.

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

       scala> val b = (5 /: a)(_+_)
       b: Int = 15

       scala> val c = (5 /: a)((x,y) => x + y)
       c: Int = 15

   Note: will not terminate for infinite-sized collections.

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

   B

     the result type of the binary operator.

   z

     the start value.

   op

     the binary operator.

   returns

     the result of inserting `op` between consecutive elements of this traversable or iterator, going left to right with the start value `z` on the left:

         op(...op(op(z, x_1), x_2), ..., x_n)

     where `x1, ..., xn` are the elements of this traversable or iterator.

   Definition Classes
     TraversableOnce → GenTraversableOnce
   Annotations
     @deprecated
   Deprecated

     (Since version 2.12.10) Use foldLeft instead of /:

2.  def :\[B](z: B)(op: ((A, B), B) ⇒ B): B

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

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

   Note: `:\` is alternate syntax for `foldRight`; `xs :\ z` is the same as `xs foldRight z`.

   Note: will not terminate for infinite-sized collections.

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

   Examples:

   Note that the folding function used to compute b is equivalent to that used to compute c.

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

       scala> val b = (a :\ 5)(_+_)
       b: Int = 15

       scala> val c = (a :\ 5)((x,y) => x + y)
       c: Int = 15

   B

     the result type of the binary operator.

   z

     the start value

   op

     the binary operator

   returns

     the result of inserting `op` between consecutive elements of this traversable or iterator, going right to left with the start value `z` on the right:

         op(x_1, op(x_2, ... op(x_n, z)...))

     where `x1, ..., xn` are the elements of this traversable or iterator.

   Definition Classes
     TraversableOnce → GenTraversableOnce
   Annotations
     @deprecated
   Deprecated

     (Since version 2.12.10) Use foldRight instead of :\

3.  def formatted(fmtstr: String): String

   Returns string formatted according to given `format` string.

   Returns string formatted according to given `format` string. Format strings are as for `String.format` (@see java.lang.String.format).

   Implicit
     This member is added by an implicit conversion from Map[A, B] to StringFormat[Map[A, B]] performed by method StringFormat in scala.Predef.
   Definition Classes
     StringFormat
   Annotations
     @deprecated @inline()
   Deprecated

     (Since version 2.12.16) Use `formatString.format(value)` instead of `value.formatted(formatString)`, or use the `f""` string interpolator. In Java 15 and later, `formatted` resolves to the new method in String which has reversed parameters.

### Inherited from mutable.Map[A, B]

### Inherited from mutable.MapLike[A, B, mutable.Map[A, B]]

### Inherited from mutable.Cloneable[mutable.Map[A, B]]

### Inherited from Cloneable

### Inherited from java.lang.Cloneable

### Inherited from Shrinkable[A]

### Inherited from Builder[(A, B), mutable.Map[A, B]]

### Inherited from Growable[(A, B)]

### Inherited from Clearable

### Inherited from collection.Map[A, B]

### Inherited from MapLike[A, B, mutable.Map[A, B]]

### Inherited from Subtractable[A, mutable.Map[A, B]]

### Inherited from PartialFunction[A, B]

### Inherited from (A) ⇒ B

### Inherited from GenMap[A, B]

### Inherited from GenMapLike[A, B, mutable.Map[A, B]]

### Inherited from mutable.Iterable[(A, B)]

### Inherited from Iterable[(A, B)]

### Inherited from IterableLike[(A, B), mutable.Map[A, B]]

### Inherited from Equals

### Inherited from GenIterable[(A, B)]

### Inherited from GenIterableLike[(A, B), mutable.Map[A, B]]

### Inherited from mutable.Traversable[(A, B)]

### Inherited from Mutable

### Inherited from Traversable[(A, B)]

### Inherited from GenTraversable[(A, B)]

### Inherited from GenericTraversableTemplate[(A, B), mutable.Iterable]

### Inherited from TraversableLike[(A, B), mutable.Map[A, B]]

### Inherited from GenTraversableLike[(A, B), mutable.Map[A, B]]

### Inherited from Parallelizable[(A, B), ParMap[A, B]]

### Inherited from TraversableOnce[(A, B)]

### Inherited from GenTraversableOnce[(A, B)]

### Inherited from FilterMonadic[(A, B), mutable.Map[A, B]]

### Inherited from HasNewBuilder[(A, B), mutable.Map[A, B]]

### Inherited from AnyRef

### Inherited from Any

### Inherited by implicit conversion CollectionsHaveToParArray from Map[A, B] to CollectionsHaveToParArray[Map[A, B], T]

### Inherited by implicit conversion MonadOps from Map[A, B] to MonadOps[(A, B)]

### Inherited by implicit conversion any2stringadd from Map[A, B] to any2stringadd[Map[A, B]]

### Inherited by implicit conversion StringFormat from Map[A, B] to StringFormat[Map[A, B]]

### Inherited by implicit conversion Ensuring from Map[A, B] to Ensuring[Map[A, B]]

### Inherited by implicit conversion ArrowAssoc from Map[A, B] to ArrowAssoc[Map[A, B]]

### Inherited by implicit conversion alternateImplicit from Map[A, B] to ForceImplicitAmbiguity

### Ungrouped