Scala Standard Library2.13.18 < 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.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.collection.parallel` - Parallel collections (scala-parallel-collections.jar)
  - `scala.util.parsing` - Parser combinators (scala-parser-combinators.jar)
  - `scala.swing` - A convenient wrapper around Java's GUI framework called Swing (scala-swing.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
  Definition Classes
    scala
-  object MapView extends MapViewFactory
  Definition Classes
    collection
- Filter
- FilterKeys
- Id
- MapValues
- TapEach

c

scala.collection.MapView

# Id

###

#### class Id[K, +V] extends AbstractMapView[K, V]

Annotations
  @SerialVersionUID()
Source
  MapView.scala

Linear Supertypes
AbstractMapView[K, V], MapView[K, V], MapOps[K, V, [X, Y]View[(X, Y)], View[(K, V)]], PartialFunction[K, V], (K) => V, AbstractView[(K, V)], View[(K, V)], java.io.Serializable, AbstractIterable[(K, V)], Iterable[(K, V)], IterableFactoryDefaults[(K, V), [x]View[x]], IterableOps[(K, V), [_]View[_], View[(K, V)]], IterableOnceOps[(K, V), [_]View[_], View[(K, V)]], IterableOnce[(K, V)], AnyRef, Any
Type Hierarchy

Ordering

1. Alphabetic
2. By Inheritance

Inherited

1. Id
2. AbstractMapView
3. MapView
4. MapOps
5. PartialFunction
6. Function1
7. AbstractView
8. View
9. Serializable
10. AbstractIterable
11. Iterable
12. IterableFactoryDefaults
13. IterableOps
14. IterableOnceOps
15. IterableOnce
16. AnyRef
17. Any

Implicitly

1. by UnliftOps
2. by iterableOnceExtensionMethods
3. by any2stringadd
4. by StringFormat
5. by Ensuring
6. by ArrowAssoc

1. Hide All
2. Show All

Visibility

1. Public
2. Protected

### Instance Constructors

1.  new Id(underlying: SomeMapOps[K, V])

### Type Members

1.  trait GenKeySet extends AnyRef

   A generic trait that is reused by keyset implementations

   A generic trait that is reused by keyset implementations

   Attributes
     protected
   Definition Classes
     MapOps
2.  class KeySet extends AbstractSet[K] with GenKeySet with DefaultSerializable

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

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

   Attributes
     protected
   Definition Classes
     MapOps

### 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 ++[V2 >: V](xs: IterableOnce[(K, V2)]): View[(K, V2)]

   Alias for `concat`

   Alias for `concat`

   Definition Classes
     MapOps
4.  final def ++[B >: (K, V)](suffix: IterableOnce[B]): View[B]

   Alias for `concat`

   Alias for `concat`

   Definition Classes
     IterableOps
   Annotations
     @inline()
5.  def ->[B](y: B): (Id[K, V], B)
   Implicit
     This member is added by an implicit conversion from Id[K, V] toArrowAssoc[Id[K, V]] performed by method ArrowAssoc in scala.Predef.This conversion will take place only if V is a subclass of Option[Nothing] (V <: Option[Nothing]).
   Definition Classes
     ArrowAssoc
   Annotations
     @inline()
6.  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
7.  def addString(sb: mutable.StringBuilder, start: String, sep: String, end: String): sb.type

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

   Appends all elements 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 (w.r.t. the method `toString`) of all elements of this map are separated by the string `sep`.

   Example:

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

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

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

   start

     the starting string.

   sep

     the separator string.

   end

     the ending string.

   returns

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

   Definition Classes
     MapOps → IterableOnceOps
8.  final def addString(b: mutable.StringBuilder): b.type

   Appends all elements of this map to a string builder.

   Appends all elements of this map to a string builder. The written text consists of the string representations (w.r.t. the method `toString`) of all elements of this map 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
     IterableOnceOps
   Annotations
     @inline()
9.  final def addString(b: mutable.StringBuilder, sep: String): b.type

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

   Appends all elements of this map 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 map, 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
     IterableOnceOps
   Annotations
     @inline()
10.  def andThen[C](k: PartialFunction[V, C]): PartialFunction[K, C]

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

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

    Note that calling isDefinedAt on the resulting partial function may apply the first partial function and execute its side effect. For efficiency, it is recommended to call applyOrElse instead of isDefinedAt or apply.

    C

      the result type of the transformation function.

    k

      the transformation function

    returns

      a partial function with the domain of this partial function narrowed by other partial function, which maps arguments `x` to `k(this(x))`.

    Definition Classes
      PartialFunction
11.  def andThen[C](k: (V) => C): PartialFunction[K, 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.

    If the runtime type of the function is a `PartialFunction` then the other `andThen` method is used (note its cautions).

    C

      the result type of the transformation function.

    k

      the transformation function

    returns

      a partial function with the domain of this partial function, possibly narrowed by the specified function, which maps arguments `x` to `k(this(x))`.

    Definition Classes
      PartialFunction → Function1
12.  def apply(key: K): V

    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
      MapOps → Function1
    Annotations
      @throws(cause = "")
13.  def applyOrElse[K1 <: K, V1 >: V](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
      MapOps → PartialFunction
14.  final def asInstanceOf[T0]: T0

    Forces the compiler to treat the receiver object as having type `T0`, even though doing so may violate type safety.

    Forces the compiler to treat the receiver object as having type `T0`, even though doing so may violate type safety.

    This method is useful when you believe you have type information the compiler doesn't, and it also isn't possible to check the type at runtime. In such situations, skipping type safety is the only option.

    It is platform dependent whether `asInstanceOf` has any effect at runtime. It might do a runtime type test on the erasure of `T0`, insert a conversion (such as boxing/unboxing), fill in a default value, or do nothing at all.

    In particular, `asInstanceOf` is not a type test. It does **not** mean:

        this match {
         case x: T0 => x
         case _     => throw ClassCastException("...")

    Use pattern matching or isInstanceOf for type testing instead.

    Situations where `asInstanceOf` is useful:

    - when flow analysis fails to deduce `T0` automatically
    - when down-casting a type parameter or an abstract type member (which cannot be checked at runtime due to type erasure) If there is any doubt and you are able to type test instead, you should do so.

    Be careful of using `asInstanceOf` when `T0` is a primitive type. When `T0` is primitive, `asInstanceOf` may insert a conversion instead of a type test. If your intent is to convert, use a `toT` method (`x.toChar`, `x.toByte`, etc.).

    returns

      the receiver object.

    Definition Classes
      Any
    Exceptions thrown

      `ClassCastException` if the receiver is not an instance of the erasure of `T0`, if that can be checked on this platform

15.  def className: String

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

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

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

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

    returns

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

    Attributes
      protected[this]
    Definition Classes
      Iterable
16.  def clone(): AnyRef

    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.

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

      not specified by SLS as a member of AnyRef

17.  final def coll: Id.this.type

    returns

      This collection as a `C`.

    Attributes
      protected
    Definition Classes
      Iterable → IterableOps
18.  def collect[K2, V2](pf: PartialFunction[(K, V), (K2, V2)]): View[(K2, V2)]

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

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

    K2

      the key type of the returned map.

    V2

      the value type of the returned map.

    pf

      the partial function which filters and maps the map.

    returns

      a new 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
      MapOps
19.  def collect[B](pf: PartialFunction[(K, V), B]): View[B]

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

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

    B

      the element type of the returned map.

    pf

      the partial function which filters and maps the map.

    returns

      a new 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
      IterableOps → IterableOnceOps
20.  def collectFirst[B](pf: PartialFunction[(K, V), B]): Option[B]

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

    Finds the first element of the map 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
      IterableOnceOps
    Example:

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

21.  def compose[R](k: PartialFunction[R, K]): PartialFunction[R, V]

    Composes another partial function `k` with this partial function so that this partial function gets applied to results of `k`.

    Composes another partial function `k` with this partial function so that this partial function gets applied to results of `k`.

    Note that calling isDefinedAt on the resulting partial function may apply the first partial function and execute its side effect. For efficiency, it is recommended to call applyOrElse instead of isDefinedAt or apply.

    R

      the parameter type of the transformation function.

    k

      the transformation function

    returns

      a partial function with the domain of other partial function narrowed by this partial function, which maps arguments `x` to `this(k(x))`.

    Definition Classes
      PartialFunction
22.  def compose[A](g: (A) => K): (A) => V

    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()
23.  def concat[V2 >: V](suffix: IterableOnce[(K, V2)]): View[(K, V2)]

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

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

    suffix

      the iterable to append.

    returns

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

    Definition Classes
      MapOps
24.  def concat[B >: (K, V)](suffix: IterableOnce[B]): View[B]

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

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

    B

      the element type of the returned collection.

    suffix

      the iterable to append.

    returns

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

    Definition Classes
      IterableOps
25.  def contains(key: K): 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
      MapOps
26.  def copyToArray[B >: (K, V)](dest: Array[B], start: Int, n: Int): Int

    Copies elements to an array and returns the number of elements written.

    Copies elements to an array and returns the number of elements written.

    Fills the given array `dest` starting at index `start` with at most `n` elements of this map.

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

    If `start` is less than zero, it is taken as zero.

    B

      the type of the elements of the array.

    dest

      the array to fill.

    start

      the starting index of xs.

    n

      the maximal number of elements to copy.

    returns

      the number of elements written to the array

    Definition Classes
      IterableOnceOps
    Note

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

27.  def copyToArray[B >: (K, V)](dest: Array[B], start: Int): Int

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

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

    Fills the given array `dest` starting at index `start` with values of this map.

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

    B

      the type of the elements of the array.

    dest

      the array to fill.

    start

      the starting index of xs.

    returns

      the number of elements written to the array

    Definition Classes
      IterableOnceOps
    Annotations
      @deprecatedOverriding()
    Note

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

28.  def copyToArray[B >: (K, V)](dest: Array[B]): Int

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

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

    Fills the given array `dest` starting at index `start` with values of this map.

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

    B

      the type of the elements of the array.

    dest

      the array to fill.

    returns

      the number of elements written to the array

    Definition Classes
      IterableOnceOps
    Annotations
      @deprecatedOverriding()
    Note

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

29.  def corresponds[B](that: IterableOnce[B])(p: ((K, V), B) => Boolean): Boolean

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

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

    Note: will not terminate for infinite-sized collections.

    B

      the type of the elements of `that`

    that

      the other collection

    p

      the test predicate, which relates elements from both collections

    returns

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

    Definition Classes
      IterableOnceOps
30.  def count(p: ((K, V)) => Boolean): Int

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

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

    Note: will not terminate for infinite-sized collections.

    p

      the predicate used to test elements.

    returns

      the number of elements satisfying the predicate `p`.

    Definition Classes
      IterableOnceOps
31.  def default(key: K): V

    Defines the default value computation for the map, returned when a key is not found.

    Defines the default value computation for the map, returned when a key is not found.

    The method implemented here throws an exception, but it may be overridden by subclasses.

    key

      the given key value for which a binding is missing.

    Definition Classes
      MapOps
    Annotations
      @throws(cause = "")
    Exceptions thrown

      `NoSuchElementException` if no default value is defined

32.  def drop(n: Int): View[(K, V)]

    Selects all elements except the first `n` ones.

    Selects all elements except the 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 map.

    returns

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

    Definition Classes
      IterableOps → IterableOnceOps
33.  def dropRight(n: Int): View[(K, V)]

    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 drop from this map.

    returns

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

    Definition Classes
      IterableOps
34.  def dropWhile(p: ((K, V)) => Boolean): View[(K, V)]

    Selects all elements except the longest prefix that satisfies a predicate.

    Selects all elements except the longest prefix that satisfies a predicate.

    The matching prefix starts with the first element of this map, and the element following the prefix is the first element that does not satisfy the predicate. The matching prefix may be empty, so that this method returns the entire map.

    Example:

        scala> List(1, 2, 3, 100, 4).dropWhile(n => n < 10)
        val res0: List[Int] = List(100, 4)

        scala> List(1, 2, 3, 100, 4).dropWhile(n => n == 0)
        val res1: List[Int] = List(1, 2, 3, 100, 4)

    Use span to obtain both the prefix and suffix. Use filterNot to drop all elements that satisfy the predicate.

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

    p

      The predicate used to test elements.

    returns

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

    Definition Classes
      IterableOps → IterableOnceOps
35.  def elementWise: ElementWiseExtractor[K, V]

    Returns an extractor object with a `unapplySeq` method, which extracts each element of a sequence data.

    Returns an extractor object with a `unapplySeq` method, which extracts each element of a sequence data.

    Definition Classes
      PartialFunction
    Example:

    1.     val firstChar: String => Option[Char] = _.headOption

           Seq("foo", "bar", "baz") match {
             case firstChar.unlift.elementWise(c0, c1, c2) =>
               println(s"$c0, $c1, $c2") // Output: f, b, b
           }

36.  def empty: MapView[K, V]

    The empty map.

    The empty map.

    returns

      an empty iterable of type `Map`.

    Definition Classes
      MapView → View → IterableFactoryDefaults → IterableOps
37.  def ensuring(cond: (Id[K, V]) => Boolean, msg: => Any): Id[K, V]
    Implicit
      This member is added by an implicit conversion from Id[K, V] toEnsuring[Id[K, V]] performed by method Ensuring in scala.Predef.
    Definition Classes
      Ensuring
38.  def ensuring(cond: (Id[K, V]) => Boolean): Id[K, V]
    Implicit
      This member is added by an implicit conversion from Id[K, V] toEnsuring[Id[K, V]] performed by method Ensuring in scala.Predef.
    Definition Classes
      Ensuring
39.  def ensuring(cond: Boolean, msg: => Any): Id[K, V]
    Implicit
      This member is added by an implicit conversion from Id[K, V] toEnsuring[Id[K, V]] performed by method Ensuring in scala.Predef.
    Definition Classes
      Ensuring
40.  def ensuring(cond: Boolean): Id[K, V]
    Implicit
      This member is added by an implicit conversion from Id[K, V] toEnsuring[Id[K, V]] performed by method Ensuring in scala.Predef.
    Definition Classes
      Ensuring
41.  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
42.  def equals(arg0: AnyRef): Boolean

    The equality method for reference types.

    The equality method for reference types. Default implementation delegates to `eq`.

    See also `equals` in scala.Any.

    returns

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

    Definition Classes
      AnyRef → Any
43.  def exists(p: ((K, V)) => Boolean): Boolean

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

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

    Note: may not terminate for infinite-sized collections.

    p

      the predicate used to test elements.

    returns

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

    Definition Classes
      IterableOnceOps
44.  def filter(pred: ((K, V)) => Boolean): MapView[K, V]

    Selects all elements of this map which satisfy a predicate.

    Selects all elements of this map which satisfy a predicate.

    returns

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

    Definition Classes
      MapView → IterableOps → IterableOnceOps
45.  def filterKeys(p: (K) => Boolean): MapView[K, V]

    Filters this map by retaining only keys satisfying a predicate.

    Filters this map by retaining only keys satisfying a predicate.

    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
      MapView → MapOps
46.  def filterNot(pred: ((K, V)) => Boolean): MapView[K, V]

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

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

    pred

      the predicate used to test elements.

    returns

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

    Definition Classes
      MapView → IterableOps → IterableOnceOps
47.  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

48.  def find(p: ((K, V)) => Boolean): Option[(K, V)]

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

    Finds the first element of the map 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 map that satisfies `p`, or `None` if none exists.

    Definition Classes
      IterableOnceOps
49.  def flatMap[K2, V2](f: ((K, V)) => IterableOnce[(K2, V2)]): View[(K2, V2)]

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

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

    f

      the function to apply to each element.

    returns

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

    Definition Classes
      MapOps
50.  def flatMap[B](f: ((K, V)) => IterableOnce[B]): View[B]

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

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

    Definition Classes
      IterableOps → IterableOnceOps
51.  def flatten[B](implicit asIterable: ((K, V)) => IterableOnce[B]): View[B]

    Given that the elements of this collection are themselves iterable collections, converts this map into a map comprising the elements of these iterable collections.

    Given that the elements of this collection are themselves iterable collections, converts this map into a map comprising the elements of these iterable collections.

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

    asIterable

      an implicit conversion which asserts that the element type of this map is an `Iterable`.

    returns

      a new map resulting from concatenating all element collections.

    Definition Classes
      IterableOps → IterableOnceOps
52.  def fold[A1 >: (K, V)](z: A1)(op: (A1, A1) => A1): A1

    Applies the given binary operator `op` to the given initial value `z` and all elements of this map.

    Applies the given binary operator `op` to the given initial value `z` and all elements of this map.

    For each application of the operator, each operand is either an element of this map, the initial value, or another such application of the operator.

    The order of applications of the operator is unspecified and may be nondeterministic. Each element appears exactly once in the computation. The initial value may be used an arbitrary number of times, but at least once.

    If this collection is ordered, then for any application of the operator, the element(s) appearing in the left operand will precede those in the right.

    Note: might return different results for different runs, unless either of the following conditions is met: (1) the operator is associative, and the underlying collection type is ordered; or (2) the operator is associative and commutative. In either case, it is also necessary that the initial value be a neutral value for the operator, e.g. `Nil` for `List` concatenation or `1` for multiplication.

    The default implementation in `IterableOnce` is equivalent to `foldLeft` but may be overridden for more efficient traversal orders.

    Note: will not terminate for infinite-sized collections.

    A1

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

    z

      An initial value; may be used an arbitrary number of times in the computation of the result; must be a neutral value for `op` for the result to always be the same across runs.

    op

      A binary operator; must be associative for the result to always be the same across runs.

    returns

      The result of applying `op` between all the elements and `z`, or `z` if this map is empty.

    Definition Classes
      IterableOnceOps
53.  def foldLeft[B](z: B)(op: (B, (K, V)) => B): B

    Applies the given binary operator `op` to the given initial value `z` and all elements of this map, going left to right.

    Applies the given binary operator `op` to the given initial value `z` and all elements of this map, going left to right. Returns the initial value if this map is empty.

    "Going left to right" only makes sense if this collection is ordered: then if `x1`, `x2`, ..., `xn` are the elements of this map, the result is `op( op( ... op( op(z, x1), x2) ... ), xn)`.

    If this collection is not ordered, then for each application of the operator, each right operand is an element. In addition, the leftmost operand is the initial value, and each other left operand is itself an application of the operator. The elements of this map and the initial value all appear exactly once in the computation.

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

    Note: will not terminate for infinite-sized collections.

    B

      The result type of the binary operator.

    z

      An initial value.

    op

      A binary operator.

    returns

      The result of applying `op` to `z` and all elements of this map, going left to right. Returns `z` if this map is empty.

    Definition Classes
      IterableOnceOps
54.  def foldRight[B](z: B)(op: ((K, V), B) => B): B

    Applies the given binary operator `op` to all elements of this map and the given initial value `z`, going right to left.

    Applies the given binary operator `op` to all elements of this map and the given initial value `z`, going right to left. Returns the initial value if this map is empty.

    "Going right to left" only makes sense if this collection is ordered: then if `x1`, `x2`, ..., `xn` are the elements of this map, the result is `op(x1, op(x2, op( ... op(xn, z) ... )))`.

    If this collection is not ordered, then for each application of the operator, each left operand is an element. In addition, the rightmost operand is the initial value, and each other right operand is itself an application of the operator. The elements of this map and the initial value all appear exactly once in the computation.

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

    Note: will not terminate for infinite-sized collections.

    B

      The result type of the binary operator.

    z

      An initial value.

    op

      A binary operator.

    returns

      The result of applying `op` to all elements of this map and `z`, going right to left. Returns `z` if this map is empty.

    Definition Classes
      IterableOnceOps
55.  def forall(p: ((K, V)) => Boolean): Boolean

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

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

    Note: may not terminate for infinite-sized collections.

    p

      the predicate used to test elements.

    returns

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

    Definition Classes
      IterableOnceOps
56.  def foreach[U](f: ((K, V)) => U): Unit

    Applies `f` to each element for its side effects.

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

    Definition Classes
      IterableOnceOps
57.  def foreachEntry[U](f: (K, V) => U): Unit

    Apply `f` to each key/value pair for its side effects Note: [U] parameter needed to help scalac's type inference.

    Apply `f` to each key/value pair for its side effects Note: [U] parameter needed to help scalac's type inference.

    Definition Classes
      MapOps
58.  def fromSpecific(coll: IterableOnce[(K, V)]): View[(K, V)]

    Defines how to turn a given `Iterable[A]` into a collection of type `C`.

    Defines how to turn a given `Iterable[A]` into a collection of type `C`.

    This process can be done in a strict way or a non-strict way (ie. without evaluating the elements of the resulting collections). In other words, this methods defines the evaluation model of the collection.

    Attributes
      protected
    Definition Classes
      IterableFactoryDefaults → IterableOps
    Note

      When implementing a custom collection type and refining `C` to the new type, this method needs to be overridden (the compiler will issue an error otherwise). In the common case where `C =:= CC[A]`, this can be done by mixing in the scala.collection.IterableFactoryDefaults trait, which implements the method using iterableFactory.

      ,

      As witnessed by the `@uncheckedVariance` annotation, using this method might be unsound. However, as long as it is called with an `Iterable[A]` obtained from `this` collection (as it is the case in the implementations of operations where we use a `View[A]`), it is safe.

59.  def get(key: K): Option[V]

    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
      Id → MapOps
60.  final def getClass(): Class[_ <: AnyRef]

    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()
61.  def getOrElse[V1 >: V](key: K, default: => V1): V1

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

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

    V1

      the result type of the default computation.

    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
      MapOps
62.  def groupBy[K](f: ((K, V)) => K): immutable.Map[K, View[(K, V)]]

    Partitions this map into a map of maps according to some discriminator function.

    Partitions this map into a map of maps according to some discriminator function.

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

    K

      the type of keys returned by the discriminator function.

    f

      the discriminator function.

    returns

      A map from keys to maps 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 map of those elements `x` for which `f(x)` equals `k`.

    Definition Classes
      IterableOps
63.  def groupMap[K, B](key: ((K, V)) => K)(f: ((K, V)) => B): immutable.Map[K, View[B]]

    Partitions this map into a map of maps according to a discriminator function `key`.

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

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

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

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

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

    K

      the type of keys returned by the discriminator function

    B

      the type of values returned by the transformation function

    key

      the discriminator function

    f

      the element transformation function

    Definition Classes
      IterableOps
64.  def groupMapReduce[K, B](key: ((K, V)) => K)(f: ((K, V)) => B)(reduce: (B, B) => B): immutable.Map[K, B]

    Partitions this map into a map according to a discriminator function `key`.

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

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

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

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

    Definition Classes
      IterableOps
65.  def grouped(size: Int): Iterator[View[(K, V)]]

    Partitions elements in fixed size maps.

    Partitions elements in fixed size maps.

    size

      the number of elements per group

    returns

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

    Definition Classes
      IterableOps
    See also

      scala.collection.Iterator, method `grouped`

66.  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
      AnyRef → Any
    Annotations
      @native()
67.  def head: (K, V)

    Selects the first element of this map.

    Selects the first element of this map.

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

    returns

      the first element of this map.

    Definition Classes
      IterableOps
    Exceptions thrown

      `NoSuchElementException` if the map is empty.

68.  def headOption: Option[(K, V)]

    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 map if it is nonempty, `None` if it is empty.

    Definition Classes
      IterableOps
69.  def init: View[(K, V)]

    The initial part of the collection without its last element.

    The initial part of the collection without its last element.

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

    Definition Classes
      IterableOps
70.  def inits: Iterator[View[(K, V)]]

    Iterates over the inits of this map.

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

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

    returns

      an iterator over all the inits of this map

    Definition Classes
      IterableOps
    Example:

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

71.  def isDefinedAt(key: K): 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
      MapOps → PartialFunction
72.  def isEmpty: Boolean

    Tests whether the map is empty.

    Tests whether the map is empty.

    Note: The default implementation creates and discards an iterator.

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

    returns

      `true` if the map contains no elements, `false` otherwise.

    Definition Classes
      Id → IterableOnceOps
73.  final def isInstanceOf[T0]: Boolean

    Test whether the dynamic type of the receiver object has the same erasure as `T0`.

    Test whether the dynamic type of the receiver object has the same erasure as `T0`.

    Depending on what `T0` is, the test is done in one of the below ways:

    - `T0` is a non-parameterized class type, e.g. `BigDecimal`: this method returns `true` if the value of the receiver object is a `BigDecimal` or a subtype of `BigDecimal`.
    - `T0` is a parameterized class type, e.g. `List[Int]`: this method returns `true` if the value of the receiver object is some `List[X]` for any `X`. For example, `List(1, 2, 3).isInstanceOf[List[String]]` will return true.
    - `T0` is some singleton type `x.type` or literal `x`: this method returns `this.eq(x)`. For example, `x.isInstanceOf[1]` is equivalent to `x.eq(1)`
    - `T0` is an intersection `X with Y` or `X & Y: this method is equivalent to` x.isInstanceOf[X] && x.isInstanceOf[Y]``
    - `T0` is a union `X | Y`: this method is equivalent to `x.isInstanceOf[X] || x.isInstanceOf[Y]`
    - `T0` is a type parameter or an abstract type member: this method is equivalent to `isInstanceOf[U]` where `U` is `T0`'s upper bound, `Any` if `T0` is unbounded. For example, `x.isInstanceOf[A]` where `A` is an unbounded type parameter will return true for any value of `x`.

    This is exactly equivalent to the type pattern `_: T0`

    returns

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

    Definition Classes
      Any
    Note

      due to the unexpectedness of `List(1, 2, 3).isInstanceOf[List[String]]` returning true and `x.isInstanceOf[A]` where `A` is a type parameter or abstract member returning true, these forms issue a warning.

74.  def isTraversableAgain: Boolean

    Tests whether this map can be repeatedly traversed.

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

    returns

      `true` if it is repeatedly traversable, `false` otherwise.

    Definition Classes
      IterableOps → IterableOnceOps
75.  def iterableFactory: IterableFactory[View]

    The companion object of this map, providing various factory methods.

    The companion object of this map, providing various factory methods.

    Definition Classes
      View → Iterable → IterableOps
    Note

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

76.  def iterator: Iterator[(K, V)]

    An scala.collection.Iterator over the elements of this map.

    An scala.collection.Iterator over the elements of this map.

    If an `IterableOnce` object is in fact an scala.collection.Iterator, this method always returns itself, in its current state, but if it is an scala.collection.Iterable, this method always returns a new scala.collection.Iterator.

    Definition Classes
      Id → IterableOnce
77.  def keySet: Set[K]

    A set representing the keys contained by this map.

    A set representing the keys contained by this map.

    For efficiency the resulting set may be a view (maintaining a reference to the map and reflecting modifications to the map), but it may also be a strict collection without reference to the map.

    - To ensure an independent strict collection, use `m.keysIterator.toSet`
    - To obtain a view on the keys, use `scala.collection.View.fromIteratorProvider(m.keysIterator)`
    returns

      a set representing the keys contained by this map

    Definition Classes
      MapOps
78.  def keyStepper[S <: Stepper[_]](implicit shape: StepperShape[K, S]): S

    Returns a Stepper for the keys of this map.

    Returns a Stepper for the keys of this map. See method stepper.

    Definition Classes
      MapOps
79.  def keys: Iterable[K]

    Creates a view over all keys of this map.

    Creates a view over all keys of this map.

    returns

      the keys of this map as a view.

    Definition Classes
      MapView → MapOps
    Annotations
      @nowarn()
80.  def keysIterator: Iterator[K]

    An Iterator of the keys contained by this map.

    An Iterator of the keys contained by this map.

    returns

      an Iterator of the keys contained by this map

    Definition Classes
      MapOps
81.  def knownSize: Int

    The number of elements in this map, if it can be cheaply computed, -1 otherwise.

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

    Definition Classes
      Id → IterableOnce
82.  def last: (K, V)

    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 map.

    Definition Classes
      IterableOps
    Exceptions thrown

      `NoSuchElementException` If the map is empty.

83.  def lastOption: Option[(K, V)]

    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 map if it is nonempty, `None` if it is empty.

    Definition Classes
      IterableOps
84.  def lazyZip[B](that: Iterable[B]): LazyZip2[(K, V), B, Id.this.type]

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

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

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

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

    B

      the type of the second element in each eventual pair

    that

      the iterable providing the second element of each eventual pair

    returns

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

    Definition Classes
      Iterable
85.  def lift: (K) => Option[V]

    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

86.  def map[K2, V2](f: ((K, V)) => (K2, V2)): View[(K2, V2)]

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

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

    f

      the function to apply to each element.

    returns

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

    Definition Classes
      MapOps
87.  def map[B](f: ((K, V)) => B): View[B]

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

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

    B

      the element type of the returned map.

    f

      the function to apply to each element.

    returns

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

    Definition Classes
      IterableOps → IterableOnceOps
88.  def mapFactory: MapViewFactory

    The companion object of this map, providing various factory methods.

    The companion object of this map, providing various factory methods.

    Definition Classes
      MapView → MapOps
    Note

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

89.  final def mapFromIterable[K2, V2](it: Iterable[(K2, V2)]): View[(K2, V2)]

    Similar to `fromIterable`, but returns a Map collection type.

    Similar to `fromIterable`, but returns a Map collection type. Note that the return type is now `CC[K2, V2]`.

    Attributes
      protected
    Definition Classes
      MapOps
    Annotations
      @inline()
90.  def mapValues[W](f: (V) => W): MapView[K, 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
      MapView → MapOps
91.  def max[B >: (K, V)](implicit ord: math.Ordering[B]): (K, V)

    Finds the largest element.

    Finds the largest element.

    Note: will not terminate for infinite-sized collections.

    B

      The type over which the ordering is defined.

    ord

      An ordering to be used for comparing elements.

    returns

      the largest element of this map with respect to the ordering `ord`.

    Definition Classes
      IterableOnceOps
    Exceptions thrown

      `UnsupportedOperationException` if this map is empty.

92.  def maxBy[B](f: ((K, V)) => B)(implicit ord: math.Ordering[B]): (K, V)

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

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

    Note: will not terminate for infinite-sized collections.

    B

      The result type of the function `f`.

    f

      The measuring function.

    ord

      An ordering to be used for comparing elements.

    returns

      the first element of this map with the largest value measured by function `f` with respect to the ordering `ord`.

    Definition Classes
      IterableOnceOps
    Exceptions thrown

      `UnsupportedOperationException` if this map is empty.

93.  def maxByOption[B](f: ((K, V)) => B)(implicit ord: math.Ordering[B]): Option[(K, V)]

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

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

    Note: will not terminate for infinite-sized collections.

    B

      The result type of the function `f`.

    f

      The measuring function.

    ord

      An ordering to be used for comparing elements.

    returns

      an option value containing the first element of this map with the largest value measured by function `f` with respect to the ordering `ord`.

    Definition Classes
      IterableOnceOps
94.  def maxOption[B >: (K, V)](implicit ord: math.Ordering[B]): Option[(K, V)]

    Finds the largest element.

    Finds the largest element.

    Note: will not terminate for infinite-sized collections.

    B

      The type over which the ordering is defined.

    ord

      An ordering to be used for comparing elements.

    returns

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

    Definition Classes
      IterableOnceOps
95.  def min[B >: (K, V)](implicit ord: math.Ordering[B]): (K, V)

    Finds the smallest element.

    Finds the smallest element.

    Note: will not terminate for infinite-sized collections.

    B

      The type over which the ordering is defined.

    ord

      An ordering to be used for comparing elements.

    returns

      the smallest element of this map with respect to the ordering `ord`.

    Definition Classes
      IterableOnceOps
    Exceptions thrown

      `UnsupportedOperationException` if this map is empty.

96.  def minBy[B](f: ((K, V)) => B)(implicit ord: math.Ordering[B]): (K, V)

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

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

    Note: will not terminate for infinite-sized collections.

    B

      The result type of the function `f`.

    f

      The measuring function.

    ord

      An ordering to be used for comparing elements.

    returns

      the first element of this map with the smallest value measured by function `f` with respect to the ordering `ord`.

    Definition Classes
      IterableOnceOps
    Exceptions thrown

      `UnsupportedOperationException` if this map is empty.

97.  def minByOption[B](f: ((K, V)) => B)(implicit ord: math.Ordering[B]): Option[(K, V)]

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

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

    Note: will not terminate for infinite-sized collections.

    B

      The result type of the function `f`.

    f

      The measuring function.

    ord

      An ordering to be used for comparing elements.

    returns

      an option value containing the first element of this map with the smallest value measured by function `f` with respect to the ordering `ord`.

    Definition Classes
      IterableOnceOps
98.  def minOption[B >: (K, V)](implicit ord: math.Ordering[B]): Option[(K, V)]

    Finds the smallest element.

    Finds the smallest element.

    Note: will not terminate for infinite-sized collections.

    B

      The type over which the ordering is defined.

    ord

      An ordering to be used for comparing elements.

    returns

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

    Definition Classes
      IterableOnceOps
99.  final def mkString: String

    Displays all elements of this map in a string.

    Displays all elements of this map in a string.

    Delegates to addString, which can be overridden.

    returns

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

    Definition Classes
      IterableOnceOps
    Annotations
      @inline()
100.  final def mkString(sep: String): String

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

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

     Delegates to addString, which can be overridden.

     sep

       the separator string.

     returns

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

     Definition Classes
       IterableOnceOps
     Annotations
       @inline()
     Example:

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

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

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

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

     Delegates to addString, which can be overridden.

     start

       the starting string.

     sep

       the separator string.

     end

       the ending string.

     returns

       a string representation of this map. 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 map are separated by the string `sep`.

     Definition Classes
       IterableOnceOps
     Example:

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

102.  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
103.  def newSpecificBuilder: Builder[(K, V), View[(K, V)]]

     returns

       a strict builder for the same collection type. Note that in the case of lazy collections (e.g. scala.collection.View or scala.collection.immutable.LazyList), it is possible to implement this method but the resulting `Builder` will break laziness. As a consequence, operations should preferably be implemented with `fromSpecific` instead of this method.

     Attributes
       protected
     Definition Classes
       IterableFactoryDefaults → IterableOps
     Note

       When implementing a custom collection type and refining `C` to the new type, this method needs to be overridden (the compiler will issue an error otherwise). In the common case where `C =:= CC[A]`, this can be done by mixing in the scala.collection.IterableFactoryDefaults trait, which implements the method using iterableFactory.

       ,

       As witnessed by the `@uncheckedVariance` annotation, using this method might be unsound. However, as long as the returned builder is only fed with `A` values taken from `this` instance, it is safe.

104.  def nonEmpty: Boolean

     Tests whether the map is not empty.

     Tests whether the map is not empty.

     returns

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

     Definition Classes
       IterableOnceOps
     Annotations
       @deprecatedOverriding()
105.  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

106.  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

107.  def orElse[A1 <: K, B1 >: V](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
108.  def partition(p: ((K, V)) => Boolean): (MapView[K, V], MapView[K, V])

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

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

     The two map correspond to the result of filter and filterNot, respectively.

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

     Definition Classes
       MapView → IterableOps
109.  def partitionMap[A1, A2](f: ((K, V)) => Either[A1, A2]): (View[A1], View[A2])

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

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

     Example:

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

     A1

       the element type of the first resulting collection

     A2

       the element type of the second resulting collection

     f

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

     returns

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

     Definition Classes
       IterableOps
110.  def product[B >: (K, V)](implicit num: math.Numeric[B]): B

     Multiplies together the elements of this collection.

     Multiplies together the elements of this collection.

     The default implementation uses `reduce` for a known non-empty collection, `foldLeft` otherwise.

     Note: will not terminate for infinite-sized collections.

     B

       the result type of the `*` operator.

     num

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

     returns

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

     Definition Classes
       IterableOnceOps
111.  def reduce[B >: (K, V)](op: (B, B) => B): B

     Applies the given binary operator `op` to all elements of this map.

     Applies the given binary operator `op` to all elements of this map.

     For each application of the operator, each operand is either an element of this map or another such application of the operator. The order of applications of the operator is unspecified and may be nondeterministic. Each element appears exactly once in the computation.

     If this collection is ordered, then for any application of the operator, the element(s) appearing in the left operand will precede those in the right.

     Note: might return different results for different runs, unless either of the following conditions is met: (1) the operator is associative, and the underlying collection type is ordered; or (2) the operator is associative and commutative.

     Note: will not terminate for infinite-sized collections.

     B

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

     op

       A binary operator; must be associative for the result to always be the same across runs.

     returns

       The result of applying `op` between all the elements if the map is nonempty.

     Definition Classes
       IterableOnceOps
     Exceptions thrown

       `UnsupportedOperationException` if this map is empty.

112.  def reduceLeft[B >: (K, V)](op: (B, (K, V)) => B): B

     Applies the given binary operator `op` to all elements of this map, going left to right.

     Applies the given binary operator `op` to all elements of this map, going left to right.

     "Going left to right" only makes sense if this collection is ordered: then if `x1`, `x2`, ..., `xn` are the elements of this map, the result is `op( op( op( ... op(x1, x2) ... ), xn-1), xn)`.

     If this collection is not ordered, then for each application of the operator, each right operand is an element. In addition, the leftmost operand is the first element of this map and each other left operand is itself an application of the operator. Each element appears exactly once in the computation.

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

     Note: will not terminate for infinite-sized collections.

     B

       The result type of the binary operator, a supertype of `A`.

     op

       A binary operator.

     returns

       The result of applying `op` to all elements of this map, going left to right.

     Definition Classes
       IterableOnceOps
     Exceptions thrown

       `UnsupportedOperationException` if this map is empty.

113.  def reduceLeftOption[B >: (K, V)](op: (B, (K, V)) => B): Option[B]

     If this map is nonempty, reduces it with the given binary operator `op`, going left to right.

     If this map is nonempty, reduces it with the given binary operator `op`, going left to right.

     The behavior is the same as reduceLeft except that the value is `None` if the map is empty. Each element appears exactly once in the computation.

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

     Note: will not terminate for infinite-sized collections.

     B

       The result type of the binary operator, a supertype of `A`.

     op

       A binary operator.

     returns

       The result of reducing this map with `op` going left to right if the map is nonempty, inside a `Some`, and `None` otherwise.

     Definition Classes
       IterableOnceOps
114.  def reduceOption[B >: (K, V)](op: (B, B) => B): Option[B]

     If this map is nonempty, reduces it with the given binary operator `op`.

     If this map is nonempty, reduces it with the given binary operator `op`.

     The behavior is the same as reduce except that the value is `None` if the map is empty. The order of applications of the operator is unspecified and may be nondeterministic. Each element appears exactly once in the computation.

     Note: might return different results for different runs, unless either of the following conditions is met: (1) the operator is associative, and the underlying collection type is ordered; or (2) the operator is associative and commutative.

     Note: will not terminate for infinite-sized collections.

     B

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

     op

       A binary operator; must be associative for the result to always be the same across runs.

     returns

       The result of reducing this map with `op` if the map is nonempty, inside a `Some`, and `None` otherwise.

     Definition Classes
       IterableOnceOps
115.  def reduceRight[B >: (K, V)](op: ((K, V), B) => B): B

     Applies the given binary operator `op` to all elements of this map, going right to left.

     Applies the given binary operator `op` to all elements of this map, going right to left.

     "Going right to left" only makes sense if this collection is ordered: then if `x1`, `x2`, ..., `xn` are the elements of this map, the result is `op(x1, op(x2, op( ... op(xn-1, xn) ... )))`.

     If this collection is not ordered, then for each application of the operator, each left operand is an element. In addition, the rightmost operand is the last element of this map and each other right operand is itself an application of the operator. Each element appears exactly once in the computation.

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

     Note: will not terminate for infinite-sized collections.

     B

       The result type of the binary operator, a supertype of `A`.

     op

       A binary operator.

     returns

       The result of applying `op` to all elements of this map, going right to left.

     Definition Classes
       IterableOnceOps
     Exceptions thrown

       `UnsupportedOperationException` if this map is empty.

116.  def reduceRightOption[B >: (K, V)](op: ((K, V), B) => B): Option[B]

     If this map is nonempty, reduces it with the given binary operator `op`, going right to left.

     If this map is nonempty, reduces it with the given binary operator `op`, going right to left.

     The behavior is the same as reduceRight except that the value is `None` if the map is empty. Each element appears exactly once in the computation.

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

     Note: will not terminate for infinite-sized collections.

     B

       The result type of the binary operator, a supertype of `A`.

     op

       A binary operator.

     returns

       The result of reducing this map with `op` going right to left if the map is nonempty, inside a `Some`, and `None` otherwise.

     Definition Classes
       IterableOnceOps
117.  def reversed: Iterable[(K, V)]
     Attributes
       protected
     Definition Classes
       IterableOnceOps
118.  def runWith[U](action: (V) => U): (K) => 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
     See also

       `applyOrElse`.

119.  def scan[B >: (K, V)](z: B)(op: (B, B) => B): View[B]

     Computes a prefix scan of the elements of the collection.

     Computes a prefix scan of the elements of the collection.

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

     B

       element type of the resulting collection

     z

       neutral element for the operator `op`

     op

       the associative operator for the scan

     returns

       a new map containing the prefix scan of the elements in this map

     Definition Classes
       IterableOps
120.  def scanLeft[B](z: B)(op: (B, (K, V)) => B): View[B]

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

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

     Note: will not terminate for infinite-sized collections.

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

     B

       the type of the elements in the resulting collection

     z

       the initial value

     op

       the binary operator applied to the intermediate result and the element

     returns

       collection with intermediate results

     Definition Classes
       IterableOps → IterableOnceOps
121.  def scanRight[B](z: B)(op: ((K, V), B) => B): View[B]

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

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

     Note: will not terminate for infinite-sized collections.

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

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

     Example:

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

     B

       the type of the elements in the resulting collection

     z

       the initial value

     op

       the binary operator applied to the intermediate result and the element

     returns

       collection with intermediate results

     Definition Classes
       IterableOps
122.  def size: Int

     The size of this map.

     The size of this map.

     Note: will not terminate for infinite-sized collections.

     returns

       the number of elements in this map.

     Definition Classes
       IterableOnceOps
123.  def sizeCompare(that: Iterable[_]): Int

     Compares the size of this map to the size of another `Iterable`.

     Compares the size of this map to the size of another `Iterable`.

     that

       the `Iterable` whose size is compared with this map's size.

     returns

       A value `x` where

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

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

     Definition Classes
       IterableOps
124.  def sizeCompare(otherSize: Int): Int

     Compares the size of this map to a test value.

     Compares the size of this map to a test value.

     otherSize

       the test value that gets compared with the size.

     returns

       A value `x` where

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

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

     Definition Classes
       IterableOps
     See also

       sizeIs

125.  final def sizeIs: SizeCompareOps

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

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

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

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

     Definition Classes
       IterableOps
     Annotations
       @inline()
126.  def slice(from: Int, until: Int): View[(K, V)]

     Selects an interval of elements.

     Selects an interval of elements. The returned map 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.

     from

       the lowest index to include from this map.

     until

       the lowest index to EXCLUDE from this map.

     returns

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

     Definition Classes
       IterableOps → IterableOnceOps
     Example:

     1. `List('a', 'b', 'c', 'd', 'e').slice(1, 3) == List('b', 'c')`

127.  def sliding(size: Int, step: Int): Iterator[View[(K, V)]]

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

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

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

     size

       the number of elements per group

     step

       the distance between the first elements of successive groups

     returns

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

     Definition Classes
       IterableOps
     Examples:

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

     ,

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

     See also

       scala.collection.Iterator, method `sliding`

128.  def sliding(size: Int): Iterator[View[(K, V)]]

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

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

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

     size

       the number of elements per group

     returns

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

     Definition Classes
       IterableOps
     Examples:

     1. `List().sliding(2) = empty iterator`

     ,

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

     ,

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

     ,

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

     See also

       scala.collection.Iterator, method `sliding`

129.  def span(p: ((K, V)) => Boolean): (View[(K, V)], View[(K, V)])

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

     Splits this map 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.

     p

       the test predicate

     returns

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

     Definition Classes
       IterableOps → IterableOnceOps
130.  def splitAt(n: Int): (View[(K, V)], View[(K, V)])

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

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

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

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

     n

       the position at which to split.

     returns

       a pair of maps consisting of the first `n` elements of this map, and the other elements.

     Definition Classes
       IterableOps → IterableOnceOps
131.  def stepper[S <: Stepper[_]](implicit shape: StepperShape[(K, V), S]): S

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

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

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

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

     - For collections of `Int`, `Short`, `Byte` or `Char`, an scala.collection.IntStepper is returned
     - For collections of `Double` or `Float`, a scala.collection.DoubleStepper is returned
     - For collections of `Long` a scala.collection.LongStepper is returned
     - For any other element type, an scala.collection.AnyStepper is returned

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

     Definition Classes
       IterableOnce
132.  def stringPrefix: String
     Attributes
       protected[this]
     Definition Classes
       MapView → View → Iterable
     Annotations
       @nowarn()
133.  def sum[B >: (K, V)](implicit num: math.Numeric[B]): B

     Sums the elements of this collection.

     Sums the elements of this collection.

     The default implementation uses `reduce` for a known non-empty collection, `foldLeft` otherwise.

     Note: will not terminate for infinite-sized collections.

     B

       the result type of the `+` operator.

     num

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

     returns

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

     Definition Classes
       IterableOnceOps
134.  final def synchronized[T0](arg0: => T0): T0

     Executes the code in `body` with an exclusive lock on `this`.

     Executes the code in `body` with an exclusive lock on `this`.

     returns

       the result of `body`

     Definition Classes
       AnyRef
135.  def tail: View[(K, V)]

     The rest of the collection without its first element.

     The rest of the collection without its first element.

     Definition Classes
       IterableOps
136.  def tails: Iterator[View[(K, V)]]

     Iterates over the tails of this map.

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

     returns

       an iterator over all the tails of this map

     Definition Classes
       IterableOps
     Example:

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

137.  def take(n: Int): View[(K, V)]

     Selects the first `n` elements.

     Selects the first `n` elements.

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

     n

       the number of elements to take from this map.

     returns

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

     Definition Classes
       IterableOps → IterableOnceOps
138.  def takeRight(n: Int): View[(K, V)]

     Selects the last n elements.

     Selects the 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 from this map.

     returns

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

     Definition Classes
       IterableOps
139.  def takeWhile(p: ((K, V)) => Boolean): View[(K, V)]

     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.

     p

       The predicate used to test elements.

     returns

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

     Definition Classes
       IterableOps → IterableOnceOps
140.  def tapEach[U](f: ((K, V)) => U): MapView[K, V]

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

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

     U

       the return type of f

     f

       a function to apply to each element in this map

     returns

       The same logical collection as this

     Definition Classes
       MapView → IterableOps → IterableOnceOps
141.  def to[C1](factory: Factory[(K, V), C1]): C1

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

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

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

     Definition Classes
       IterableOnceOps
142.  def toArray[B >: (K, V)](implicit arg0: ClassTag[B]): Array[B]

     Converts this map to an `Array`.

     Converts this map to an `Array`.

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

     B

       The type of elements of the result, a supertype of `A`.

     returns

       This map as an `Array[B]`.

     Definition Classes
       IterableOnceOps
143.  final def toBuffer[B >: (K, V)]: Buffer[B]

     Converts this map to a `Buffer`.

     Converts this map to a `Buffer`.

     B

       The type of elements of the result, a supertype of `A`.

     returns

       This map as a `Buffer[B]`.

     Definition Classes
       IterableOnceOps
     Annotations
       @inline()
144.  def toIndexedSeq: immutable.IndexedSeq[(K, V)]

     Converts this map to an `IndexedSeq`.

     Converts this map to an `IndexedSeq`.

     returns

       This map as an `IndexedSeq[A]`.

     Definition Classes
       IterableOnceOps
145.  def toList: immutable.List[(K, V)]

     Converts this map to a `List`.

     Converts this map to a `List`.

     returns

       This map as a `List[A]`.

     Definition Classes
       IterableOnceOps
146.  def toMap[K, V](implicit ev: <:<[(K, V), (K, V)]): immutable.Map[K, V]

     Converts this map to a `Map`, given an implicit coercion from the map's type to a key-value tuple.

     Converts this map to a `Map`, given an implicit coercion from the map's type to a key-value tuple.

     K

       The key type for the resulting map.

     V

       The value type for the resulting map.

     ev

       An implicit coercion from `A` to `[K, V]`.

     returns

       This map as a `Map[K, V]`.

     Definition Classes
       IterableOnceOps
147.  def toSeq: immutable.Seq[(K, V)]

     returns

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

     Definition Classes
       IterableOnceOps
148.  def toSet[B >: (K, V)]: immutable.Set[B]

     Converts this map to a `Set`.

     Converts this map to a `Set`.

     B

       The type of elements of the result, a supertype of `A`.

     returns

       This map as a `Set[B]`.

     Definition Classes
       IterableOnceOps
149.  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 `className` of this map, followed by all elements separated by commas and enclosed in parentheses.

     Definition Classes
       MapView → View → Iterable → Function1 → AnyRef → Any
150.  def toVector: immutable.Vector[(K, V)]

     Converts this map to a `Vector`.

     Converts this map to a `Vector`.

     returns

       This map as a `Vector[A]`.

     Definition Classes
       IterableOnceOps
151.  def transpose[B](implicit asIterable: ((K, V)) => Iterable[B]): View[View[B]]

     Transposes this map of iterable collections into a map of maps.

     Transposes this map of iterable collections into a map of maps.

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

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

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

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

     B

       the type of the elements of each iterable collection.

     asIterable

       an implicit conversion which asserts that the element type of this map is an `Iterable`.

     returns

       a two-dimensional map of maps which has as nth row the nth column of this map.

     Definition Classes
       IterableOps
     Exceptions thrown

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

152.  def unapply(a: K): Option[V]

     Tries to extract a `B` from an `A` in a pattern matching expression.

     Tries to extract a `B` from an `A` in a pattern matching expression.

     Definition Classes
       PartialFunction
153.  def unlift: PartialFunction[K, B]

     Converts an optional function to a partial function.

     Converts an optional function to a partial function.

     Implicit
       This member is added by an implicit conversion from Id[K, V] toUnliftOps[K, B] performed by method UnliftOps in scala.Function1.This conversion will take place only if V is a subclass of Option[B] (V <: Option[B]).
     Definition Classes
       UnliftOps
     Example:

     1. Unlike Function.unlift, this UnliftOps.unlift method can be used in extractors.

            val of: Int => Option[String] = { i =>
              if (i == 2) {
                Some("matched by an optional function")
              } else {
                None
              }
            }

            util.Random.nextInt(4) match {
              case of.unlift(m) => // Convert an optional function to a pattern
                println(m)
              case _ =>
                println("Not matched")
            }

154.  def unzip[A1, A2](implicit asPair: ((K, V)) => (A1, A2)): (View[A1], View[A2])

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

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

         val xs = `Map`(
                    (1, "one"),
                    (2, "two"),
                    (3, "three")).unzip
         // xs == (`Map`(1, 2, 3),
         //        `Map`(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 map is a pair.

     returns

       a pair of maps, containing the first, respectively second half of each element pair of this map.

     Definition Classes
       IterableOps
155.  def unzip3[A1, A2, A3](implicit asTriple: ((K, V)) => (A1, A2, A3)): (View[A1], View[A2], View[A3])

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

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

         val xs = `Map`(
                    (1, "one", '1'),
                    (2, "two", '2'),
                    (3, "three", '3')).unzip3
         // xs == (`Map`(1, 2, 3),
         //        `Map`(one, two, three),
         //        `Map`(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 map is a triple.

     returns

       a triple of maps, containing the first, second, respectively third member of each element triple of this map.

     Definition Classes
       IterableOps
156.  def valueStepper[S <: Stepper[_]](implicit shape: StepperShape[V, S]): S

     Returns a Stepper for the values of this map.

     Returns a Stepper for the values of this map. See method stepper.

     Definition Classes
       MapOps
157.  def values: Iterable[V]

     Creates a view over all values of this map.

     Creates a view over all values of this map.

     returns

       the values of this map as a view.

     Definition Classes
       MapView → MapOps
158.  def valuesIterator: Iterator[V]

     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
       MapOps
159.  def view: MapView[K, V]

     A view over the elements of this collection.

     A view over the elements of this collection.

     Definition Classes
       MapView → View → MapOps → IterableOps
160.  final def wait(): Unit

     See https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#wait--.

     See https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#wait--.

     Definition Classes
       AnyRef
     Annotations
       @throws(classOf[java.lang.InterruptedException])
     Note

       not specified by SLS as a member of AnyRef

161.  final def wait(arg0: Long, arg1: Int): Unit

     See https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#wait-long-int-

     See https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#wait-long-int-

     Definition Classes
       AnyRef
     Annotations
       @throws(classOf[java.lang.InterruptedException])
     Note

       not specified by SLS as a member of AnyRef

162.  final def wait(arg0: Long): Unit

     See https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#wait-long-.

     See https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#wait-long-.

     Definition Classes
       AnyRef
     Annotations
       @throws(classOf[java.lang.InterruptedException]) @native()
     Note

       not specified by SLS as a member of AnyRef

163.  def withFilter(p: ((K, V)) => Boolean): MapOps.WithFilter[K, V, View, [X, Y]View[(X, Y)]]

     Creates a non-strict filter of this map.

     Creates a non-strict filter of this map.

     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 map which satisfy the predicate `p`.

     Definition Classes
       MapView → IterableOps
164.  def zip[B](that: IterableOnce[B]): View[((K, V), B)]

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

     Returns a map formed from this 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.

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

     Definition Classes
       IterableOps
165.  def zipAll[A1 >: (K, V), B](that: Iterable[B], thisElem: A1, thatElem: B): View[(A1, B)]

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

     Returns a map formed from this 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.

     that

       the iterable providing the second half of each result pair

     thisElem

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

     thatElem

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

     returns

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

     Definition Classes
       IterableOps
166.  def zipWithIndex: View[((K, V), Int)]

     Zips this map with its indices.

     Zips this map with its indices.

     returns

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

     Definition Classes
       IterableOps → IterableOnceOps
     Example:

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

### Shadowed Implicit Value Members

1.  def +(other: String): String
   Implicit
     This member is added by an implicit conversion from Id[K, V] toany2stringadd[Id[K, V]] 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:

         (id: any2stringadd[Id[K, V]]).+(other)

   Definition Classes
     any2stringadd

### Deprecated Value Members

1.  def +[V1 >: V](elem1: (K, V1), elem2: (K, V1), elems: (K, V1)*): View[(K, V1)]
   Definition Classes
     MapOps
   Annotations
     @deprecated
   Deprecated

     (Since version 2.13.0) Use ++ with an explicit collection argument instead of + with varargs

2.  def +[V1 >: V](kv: (K, V1)): View[(K, V1)]
   Definition Classes
     MapOps
   Annotations
     @deprecated
   Deprecated

     (Since version 2.13.0) Consider requiring an immutable Map or fall back to Map.concat.

3.  def ++:[V1 >: V](that: IterableOnce[(K, V1)]): View[(K, V1)]
   Definition Classes
     MapOps
   Annotations
     @deprecated
   Deprecated

     (Since version 2.13.0) Use ++ instead of ++: for collections of type Iterable

4.  def ++:[B >: (K, V)](that: IterableOnce[B]): View[B]
   Definition Classes
     IterableOps
   Annotations
     @deprecated
   Deprecated

     (Since version 2.13.0) Use ++ instead of ++: for collections of type Iterable

5.  def --(keys: IterableOnce[K]): View[(K, V)]
   Definition Classes
     MapOps
   Annotations
     @deprecated @inline()
   Deprecated

     (Since version 2.13.0) Consider requiring an immutable Map.

6.  def /:[B](z: B)(op: (B, (K, V)) => B): B
   Implicit
     This member is added by an implicit conversion from Id[K, V] toIterableOnceExtensionMethods[(K, V)] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
   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:

         (id: IterableOnceExtensionMethods[(K, V)])./:(z)(op)

   Definition Classes
     IterableOnceExtensionMethods
   Annotations
     @deprecated @inline()
   Deprecated

     (Since version 2.13.0) Use .iterator.foldLeft instead

7.  final def /:[B](z: B)(op: (B, (K, V)) => B): B
   Definition Classes
     IterableOnceOps
   Annotations
     @deprecated @inline()
   Deprecated

     (Since version 2.13.0) Use foldLeft instead of /:

8.  def :\[B](z: B)(op: ((K, V), B) => B): B
   Implicit
     This member is added by an implicit conversion from Id[K, V] toIterableOnceExtensionMethods[(K, V)] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
   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:

         (id: IterableOnceExtensionMethods[(K, V)]).:\(z)(op)

   Definition Classes
     IterableOnceExtensionMethods
   Annotations
     @deprecated @inline()
   Deprecated

     (Since version 2.13.0) Use .iterator.foldRight instead

9.  final def :\[B](z: B)(op: ((K, V), B) => B): B
   Definition Classes
     IterableOnceOps
   Annotations
     @deprecated @inline()
   Deprecated

     (Since version 2.13.0) Use foldRight instead of :\

10.  def aggregate[B](z: => B)(seqop: (B, (K, V)) => 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.

    Since this method degenerates to `foldLeft` for sequential (non-parallel) collections, where the combining operation is ignored, it is advisable to prefer `foldLeft` for that case.

    For parallel collections, use the `aggregate` method specified by `scala.collection.parallel.ParIterableLike`.

    B

      the result type, produced by `seqop`, `combop`, and by this function as a final result.

    z

      the start value, a neutral element for `seqop`.

    seqop

      the binary operator used to accumulate the result.

    combop

      an associative operator for combining sequential results, unused for sequential collections.

    Definition Classes
      IterableOnceOps
    Annotations
      @deprecated
    Deprecated

      (Since version 2.13.0) For sequential collections, prefer `foldLeft(z)(seqop)`. For parallel collections, use `ParIterableLike#aggregate`.

11.  def collectFirst[B](f: PartialFunction[(K, V), B]): Option[B]
    Implicit
      This member is added by an implicit conversion from Id[K, V] toIterableOnceExtensionMethods[(K, V)] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
    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:

          (id: IterableOnceExtensionMethods[(K, V)]).collectFirst(f)

    Definition Classes
      IterableOnceExtensionMethods
    Annotations
      @deprecated
    Deprecated

      (Since version 2.13.0) Use .iterator.collectFirst(...) instead

12.  def companion: IterableFactory[[_]View[_]]
    Definition Classes
      IterableOps
    Annotations
      @deprecated @deprecatedOverriding() @inline()
    Deprecated

      (Since version 2.13.0) Use iterableFactory instead

13.  def copyToBuffer(dest: Buffer[(K, V)]): Unit
    Implicit
      This member is added by an implicit conversion from Id[K, V] toIterableOnceExtensionMethods[(K, V)] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
    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:

          (id: IterableOnceExtensionMethods[(K, V)]).copyToBuffer(dest)

    Definition Classes
      IterableOnceExtensionMethods
    Annotations
      @deprecated
    Deprecated

      (Since version 2.13.0) Use .iterator.copyToBuffer(...) instead

14.  final def copyToBuffer[B >: (K, V)](dest: Buffer[B]): Unit
    Definition Classes
      IterableOnceOps
    Annotations
      @deprecated @inline()
    Deprecated

      (Since version 2.13.0) Use `dest ++= coll` instead

15.  def count(f: ((K, V)) => Boolean): Int
    Implicit
      This member is added by an implicit conversion from Id[K, V] toIterableOnceExtensionMethods[(K, V)] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
    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:

          (id: IterableOnceExtensionMethods[(K, V)]).count(f)

    Definition Classes
      IterableOnceExtensionMethods
    Annotations
      @deprecated
    Deprecated

      (Since version 2.13.0) Use .iterator.count(...) instead

16.  def exists(f: ((K, V)) => Boolean): Boolean
    Implicit
      This member is added by an implicit conversion from Id[K, V] toIterableOnceExtensionMethods[(K, V)] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
    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:

          (id: IterableOnceExtensionMethods[(K, V)]).exists(f)

    Definition Classes
      IterableOnceExtensionMethods
    Annotations
      @deprecated
    Deprecated

      (Since version 2.13.0) Use .iterator.exists(...) instead

17.  def filter(f: ((K, V)) => Boolean): Iterator[(K, V)]
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      This member is added by an implicit conversion from Id[K, V] toIterableOnceExtensionMethods[(K, V)] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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      (Since version 2.13.0) Use .iterator.filter(...) instead

18.  def find(p: ((K, V)) => Boolean): Option[(K, V)]
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      This member is added by an implicit conversion from Id[K, V] toIterableOnceExtensionMethods[(K, V)] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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      (Since version 2.13.0) Use .iterator.find instead

19.  def flatMap[B](f: ((K, V)) => IterableOnce[B]): IterableOnce[B]
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      This member is added by an implicit conversion from Id[K, V] toIterableOnceExtensionMethods[(K, V)] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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          (id: IterableOnceExtensionMethods[(K, V)]).flatMap(f)

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      (Since version 2.13.0) Use .iterator.flatMap instead or consider requiring an Iterable

20.  def fold[A1 >: A](z: A1)(op: (A1, A1) => A1): A1
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      This member is added by an implicit conversion from Id[K, V] toIterableOnceExtensionMethods[(K, V)] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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          (id: IterableOnceExtensionMethods[(K, V)]).fold(z)(op)

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      (Since version 2.13.0) Use .iterator.fold instead

21.  def foldLeft[B](z: B)(op: (B, (K, V)) => B): B
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      (Since version 2.13.0) Use .iterator.foldLeft instead

22.  def foldRight[B](z: B)(op: ((K, V), B) => B): B
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      (Since version 2.13.0) Use .iterator.foldRight instead

23.  def forall(f: ((K, V)) => Boolean): Boolean
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      (Since version 2.13.0) Use .iterator.forall(...) instead

24.  def force: IndexedSeq[(K, V)]
    Definition Classes
      View
    Annotations
      @deprecated @inline()
    Deprecated

      (Since version 2.13.0) Views no longer know about their underlying collection type; .force always returns an IndexedSeq

25.  def foreach[U](f: ((K, V)) => U): Unit
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      This member is added by an implicit conversion from Id[K, V] toIterableOnceExtensionMethods[(K, V)] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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      (Since version 2.13.0) Use .iterator.foreach(...) instead

26.  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 Id[K, V] toStringFormat[Id[K, V]] performed by method StringFormat in scala.Predef.
    Definition Classes
      StringFormat
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      @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.

27.  def hasDefiniteSize: Boolean

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

    Tests whether this map 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
      IterableOnceOps
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      @deprecated
    Deprecated

      (Since version 2.13.0) Check .knownSize instead of .hasDefiniteSize for more actionable information (see scaladoc for details)

    See also

      method `knownSize` for a more useful alternative

28.  def isEmpty: Boolean
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      (Since version 2.13.0) Use .iterator.isEmpty instead

29.  def map[B](f: ((K, V)) => B): IterableOnce[B]
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      (Since version 2.13.0) Use .iterator.map instead or consider requiring an Iterable

30.  def max(implicit ord: math.Ordering[(K, V)]): (K, V)
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      (Since version 2.13.0) Use .iterator.max instead

31.  def maxBy[B](f: ((K, V)) => B)(implicit cmp: math.Ordering[B]): (K, V)
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          (id: IterableOnceExtensionMethods[(K, V)]).maxBy(f)(cmp)

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      (Since version 2.13.0) Use .iterator.maxBy(...) instead

32.  def min(implicit ord: math.Ordering[(K, V)]): (K, V)
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      (Since version 2.13.0) Use .iterator.min instead

33.  def minBy[B](f: ((K, V)) => B)(implicit cmp: math.Ordering[B]): (K, V)
    Implicit
      This member is added by an implicit conversion from Id[K, V] toIterableOnceExtensionMethods[(K, V)] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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          (id: IterableOnceExtensionMethods[(K, V)]).minBy(f)(cmp)

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      (Since version 2.13.0) Use .iterator.minBy(...) instead

34.  def mkString: String
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      (Since version 2.13.0) Use .iterator.mkString instead

35.  def mkString(sep: String): String
    Implicit
      This member is added by an implicit conversion from Id[K, V] toIterableOnceExtensionMethods[(K, V)] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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36.  def mkString(start: String, sep: String, end: String): String
    Implicit
      This member is added by an implicit conversion from Id[K, V] toIterableOnceExtensionMethods[(K, V)] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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      (Since version 2.13.0) Use .iterator.mkString instead

37.  def nonEmpty: Boolean
    Implicit
      This member is added by an implicit conversion from Id[K, V] toIterableOnceExtensionMethods[(K, V)] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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      (Since version 2.13.0) Use .iterator.nonEmpty instead

38.  def product(implicit num: math.Numeric[(K, V)]): (K, V)
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      This member is added by an implicit conversion from Id[K, V] toIterableOnceExtensionMethods[(K, V)] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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          (id: IterableOnceExtensionMethods[(K, V)]).product(num)

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      (Since version 2.13.0) Use .iterator.product instead

39.  def reduce(f: ((K, V), (K, V)) => (K, V)): (K, V)
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      This member is added by an implicit conversion from Id[K, V] toIterableOnceExtensionMethods[(K, V)] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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          (id: IterableOnceExtensionMethods[(K, V)]).reduce(f)

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      (Since version 2.13.0) Use .iterator.reduce(...) instead

40.  def reduceLeft(f: ((K, V), (K, V)) => (K, V)): (K, V)
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      This member is added by an implicit conversion from Id[K, V] toIterableOnceExtensionMethods[(K, V)] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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          (id: IterableOnceExtensionMethods[(K, V)]).reduceLeft(f)

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      (Since version 2.13.0) Use .iterator.reduceLeft(...) instead

41.  def reduceLeftOption(f: ((K, V), (K, V)) => (K, V)): Option[(K, V)]
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      This member is added by an implicit conversion from Id[K, V] toIterableOnceExtensionMethods[(K, V)] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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          (id: IterableOnceExtensionMethods[(K, V)]).reduceLeftOption(f)

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      (Since version 2.13.0) Use .iterator.reduceLeftOption(...) instead

42.  def reduceOption(f: ((K, V), (K, V)) => (K, V)): Option[(K, V)]
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      This member is added by an implicit conversion from Id[K, V] toIterableOnceExtensionMethods[(K, V)] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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          (id: IterableOnceExtensionMethods[(K, V)]).reduceOption(f)

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      (Since version 2.13.0) Use .iterator.reduceOption(...) instead

43.  def reduceRight(f: ((K, V), (K, V)) => (K, V)): (K, V)
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      This member is added by an implicit conversion from Id[K, V] toIterableOnceExtensionMethods[(K, V)] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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          (id: IterableOnceExtensionMethods[(K, V)]).reduceRight(f)

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      (Since version 2.13.0) Use .iterator.reduceRight(...) instead

44.  def reduceRightOption(f: ((K, V), (K, V)) => (K, V)): Option[(K, V)]
    Implicit
      This member is added by an implicit conversion from Id[K, V] toIterableOnceExtensionMethods[(K, V)] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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          (id: IterableOnceExtensionMethods[(K, V)]).reduceRightOption(f)

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      (Since version 2.13.0) Use .iterator.reduceRightOption(...) instead

45.  final def repr: View[(K, V)]
    Definition Classes
      IterableOps
    Annotations
      @deprecated
    Deprecated

      (Since version 2.13.0) Use coll instead of repr in a collection implementation, use the collection value itself from the outside

46.  def sameElements[B >: A](that: IterableOnce[B]): Boolean
    Implicit
      This member is added by an implicit conversion from Id[K, V] toIterableOnceExtensionMethods[(K, V)] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
    Definition Classes
      IterableOnceExtensionMethods
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      @deprecated
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      (Since version 2.13.0) Use .iterator.sameElements instead

47.  def seq: Id.this.type
    Definition Classes
      Iterable
    Annotations
      @deprecated
    Deprecated

      (Since version 2.13.0) Iterable.seq always returns the iterable itself

48.  def size: Int
    Implicit
      This member is added by an implicit conversion from Id[K, V] toIterableOnceExtensionMethods[(K, V)] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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          (id: IterableOnceExtensionMethods[(K, V)]).size

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      (Since version 2.13.0) Use .iterator.size instead

49.  def sum(implicit num: math.Numeric[(K, V)]): (K, V)
    Implicit
      This member is added by an implicit conversion from Id[K, V] toIterableOnceExtensionMethods[(K, V)] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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          (id: IterableOnceExtensionMethods[(K, V)]).sum(num)

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      (Since version 2.13.0) Use .iterator.sum instead

50.  def to[C1](factory: Factory[(K, V), C1]): C1
    Implicit
      This member is added by an implicit conversion from Id[K, V] toIterableOnceExtensionMethods[(K, V)] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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          (id: IterableOnceExtensionMethods[(K, V)]).to(factory)

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      (Since version 2.13.0) Use .iterator.to(factory) instead

51.  def toArray[B >: A](implicit arg0: ClassTag[B]): Array[B]
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      This member is added by an implicit conversion from Id[K, V] toIterableOnceExtensionMethods[(K, V)] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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          (id: IterableOnceExtensionMethods[(K, V)]).toArray(arg0)

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      (Since version 2.13.0) Use .iterator.toArray

52.  def toBuffer[B >: A]: Buffer[B]
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      This member is added by an implicit conversion from Id[K, V] toIterableOnceExtensionMethods[(K, V)] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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      (Since version 2.13.0) Use .iterator.to(ArrayBuffer) instead

53.  def toIndexedSeq: IndexedSeq[(K, V)]
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      This member is added by an implicit conversion from Id[K, V] toIterableOnceExtensionMethods[(K, V)] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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      (Since version 2.13.0) Use .iterator.toIndexedSeq instead

54.  final def toIterable: Iterable[(K, V)]
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      This member is added by an implicit conversion from Id[K, V] toIterableOnceExtensionMethods[(K, V)] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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      (Since version 2.13.0) Use .iterator.to(Iterable) instead

55.  final def toIterable: Id.this.type

    returns

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

    Definition Classes
      Iterable → IterableOps
    Annotations
      @deprecated
    Deprecated

      (Since version 2.13.7) toIterable is internal and will be made protected; its name is similar to `toList` or `toSeq`, but it doesn't copy non-immutable collections

56.  def toIterator: Iterator[(K, V)]
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      This member is added by an implicit conversion from Id[K, V] toIterableOnceExtensionMethods[(K, V)] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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      (Since version 2.13.0) Use .iterator instead

57.  final def toIterator: Iterator[(K, V)]
    Definition Classes
      IterableOnceOps
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      @deprecated @inline()
    Deprecated

      (Since version 2.13.0) Use .iterator instead of .toIterator

58.  def toList: immutable.List[(K, V)]
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      This member is added by an implicit conversion from Id[K, V] toIterableOnceExtensionMethods[(K, V)] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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      (Since version 2.13.0) Use .iterator.to(List) instead

59.  def toMap[K, V](implicit ev: <:<[(K, V), (K, V)]): immutable.Map[K, V]
    Implicit
      This member is added by an implicit conversion from Id[K, V] toIterableOnceExtensionMethods[(K, V)] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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      This implicitly inherited member is shadowed by one or more members in this class.
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          (id: IterableOnceExtensionMethods[(K, V)]).toMap(ev)

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      (Since version 2.13.0) Use .iterator.to(Map) instead

60.  def toSeq: immutable.Seq[(K, V)]
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      This member is added by an implicit conversion from Id[K, V] toIterableOnceExtensionMethods[(K, V)] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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      (Since version 2.13.0) Use .iterator.to(Seq) instead

61.  def toSet[B >: A]: immutable.Set[B]
    Implicit
      This member is added by an implicit conversion from Id[K, V] toIterableOnceExtensionMethods[(K, V)] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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          (id: IterableOnceExtensionMethods[(K, V)]).toSet

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      (Since version 2.13.0) Use .iterator.to(Set) instead

62.  def toStream: immutable.Stream[(K, V)]
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      This member is added by an implicit conversion from Id[K, V] toIterableOnceExtensionMethods[(K, V)] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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    Definition Classes
      IterableOnceExtensionMethods
    Annotations
      @deprecated @inline()
    Deprecated

      (Since version 2.13.0) Use .iterator.to(LazyList) instead

63.  final def toStream: immutable.Stream[(K, V)]
    Definition Classes
      IterableOnceOps
    Annotations
      @deprecated @inline()
    Deprecated

      (Since version 2.13.0) Use .to(LazyList) instead of .toStream

64.  final def toTraversable: Traversable[(K, V)]
    Implicit
      This member is added by an implicit conversion from Id[K, V] toIterableOnceExtensionMethods[(K, V)] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
    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:

          (id: IterableOnceExtensionMethods[(K, V)]).toTraversable

    Definition Classes
      IterableOnceExtensionMethods
    Annotations
      @deprecated @inline()
    Deprecated

      (Since version 2.13.0) Use .iterator.to(Iterable) instead

65.  final def toTraversable: Traversable[(K, V)]

    Converts this map to an unspecified Iterable.

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

    returns

      An Iterable containing all elements of this map.

    Definition Classes
      IterableOps
    Annotations
      @deprecated
    Deprecated

      (Since version 2.13.0) toTraversable is internal and will be made protected; its name is similar to `toList` or `toSeq`, but it doesn't copy non-immutable collections

66.  def toVector: immutable.Vector[(K, V)]
    Implicit
      This member is added by an implicit conversion from Id[K, V] toIterableOnceExtensionMethods[(K, V)] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
    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:

          (id: IterableOnceExtensionMethods[(K, V)]).toVector

    Definition Classes
      IterableOnceExtensionMethods
    Annotations
      @deprecated @inline()
    Deprecated

      (Since version 2.13.0) Use .iterator.to(Vector) instead

67.  def view(from: Int, until: Int): View[(K, V)]

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

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

    Definition Classes
      IterableOps
    Annotations
      @deprecated
    Deprecated

      (Since version 2.13.0) Use .view.slice(from, until) instead of .view(from, until)

68.  def withFilter(f: ((K, V)) => Boolean): Iterator[(K, V)]
    Implicit
      This member is added by an implicit conversion from Id[K, V] toIterableOnceExtensionMethods[(K, V)] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
    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:

          (id: IterableOnceExtensionMethods[(K, V)]).withFilter(f)

    Definition Classes
      IterableOnceExtensionMethods
    Annotations
      @deprecated
    Deprecated

      (Since version 2.13.0) Use .iterator.withFilter(...) instead

69.  def →[B](y: B): (Id[K, V], B)
    Implicit
      This member is added by an implicit conversion from Id[K, V] toArrowAssoc[Id[K, V]] performed by method ArrowAssoc in scala.Predef.This conversion will take place only if V is a subclass of Option[Nothing] (V <: Option[Nothing]).
    Definition Classes
      ArrowAssoc
    Annotations
      @deprecated
    Deprecated

      (Since version 2.13.0) Use `->` instead. If you still wish to display it as one character, consider using a font with programming ligatures such as Fira Code.

### Inherited from AbstractMapView[K, V]

### Inherited from MapView[K, V]

### Inherited from MapOps[K, V, [X, Y]View[(X, Y)], View[(K, V)]]

### Inherited from PartialFunction[K, V]

### Inherited from (K) => V

### Inherited from AbstractView[(K, V)]

### Inherited from View[(K, V)]

### Inherited from java.io.Serializable

### Inherited from AbstractIterable[(K, V)]

### Inherited from Iterable[(K, V)]

### Inherited from IterableFactoryDefaults[(K, V), [x]View[x]]

### Inherited from IterableOps[(K, V), [_]View[_], View[(K, V)]]

### Inherited from IterableOnceOps[(K, V), [_]View[_], View[(K, V)]]

### Inherited from IterableOnce[(K, V)]

### Inherited from AnyRef

### Inherited from Any

### Inherited by implicit conversion UnliftOps fromId[K, V] to UnliftOps[K, B]

### Inherited by implicit conversion iterableOnceExtensionMethods fromId[K, V] to IterableOnceExtensionMethods[(K, V)]

### Inherited by implicit conversion any2stringadd fromId[K, V] to any2stringadd[Id[K, V]]

### Inherited by implicit conversion StringFormat fromId[K, V] to StringFormat[Id[K, V]]

### Inherited by implicit conversion Ensuring fromId[K, V] to Ensuring[Id[K, V]]

### Inherited by implicit conversion ArrowAssoc fromId[K, V] to ArrowAssoc[Id[K, V]]

### Ungrouped