scala.collection

Map

trait Map[A, +B] extends Iterable[(A, B)] with GenMap[A, B] with MapLike[A, B, Map[A, B]]

A map from keys of type A to values of type B.

Implementation note: This trait provides most of the operations of a Map independently of its representation. It is typically inherited by concrete implementations of maps.

To implement a concrete map, you need to provide implementations of the following methods:

def get(key: A): Option[B]
def iterator: Iterator[(A, B)]
def + [B1 >: B](kv: (A, B1)): This
def -(key: A): This

If you wish that methods like take, drop, filter also return the same kind of map you should also override:

def empty: This

It is also good idea to override methods foreach and size for efficiency.

Note: If you do not have specific implementations for add and - in mind, you might consider inheriting from DefaultMap instead.

Note: If your additions and mutations return the same kind of map as the map you are defining, you should inherit from MapLike as well.

A

the type of the keys in this map.

B

the type of the values associated with keys.

Source
Map.scala
Since

1.0

Linear Supertypes
MapLike[A, B, Map[A, B]], Subtractable[A, Map[A, B]], PartialFunction[A, B], (A) ⇒ B, GenMap[A, B], GenMapLike[A, B, Map[A, B]], Iterable[(A, B)], IterableLike[(A, B), Map[A, B]], Equals, GenIterable[(A, B)], GenIterableLike[(A, B), Map[A, B]], Traversable[(A, B)], GenTraversable[(A, B)], GenericTraversableTemplate[(A, B), Iterable], TraversableLike[(A, B), Map[A, B]], GenTraversableLike[(A, B), Map[A, B]], Parallelizable[(A, B), ParMap[A, B]], TraversableOnce[(A, B)], GenTraversableOnce[(A, B)], FilterMonadic[(A, B), Map[A, B]], HasNewBuilder[(A, B), Map[A, B]], AnyRef, Any
Known Subclasses
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Inherited
  1. Map
  2. MapLike
  3. Subtractable
  4. PartialFunction
  5. Function1
  6. GenMap
  7. GenMapLike
  8. Iterable
  9. IterableLike
  10. Equals
  11. GenIterable
  12. GenIterableLike
  13. Traversable
  14. GenTraversable
  15. GenericTraversableTemplate
  16. TraversableLike
  17. GenTraversableLike
  18. Parallelizable
  19. TraversableOnce
  20. GenTraversableOnce
  21. FilterMonadic
  22. HasNewBuilder
  23. AnyRef
  24. Any
Implicitly
  1. by traversable2ops
  2. by MonadOps
  3. by any2stringadd
  4. by any2stringfmt
  5. by any2ArrowAssoc
  6. by any2Ensuring
  7. by alternateImplicit
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Type Members

  1. class DefaultKeySet extends AbstractSet[A] with Set[A] with Serializable

    The implementation class of the set returned by keySet.

  2. class DefaultValuesIterable extends AbstractIterable[B] with Iterable[B] with Serializable

    The implementation class of the iterable returned by values.

  3. class FilteredKeys extends AbstractMap[A, B] with DefaultMap[A, B]

    Attributes
    protected
    Definition Classes
    MapLike
  4. class MappedValues[C] extends AbstractMap[A, C] with DefaultMap[A, C]

    Attributes
    protected
    Definition Classes
    MapLike
  5. type Self = Map[A, B]

    The type implementing this traversable

    The type implementing this traversable

    Attributes
    protected[this]
    Definition Classes
    TraversableLike
  6. class WithFilter extends FilterMonadic[A, Repr]

    A class supporting filtered operations.

Abstract Value Members

  1. abstract def get(key: A): Option[B]

    Optionally returns the value associated with a key.

    Optionally returns the value associated with a key.

    key

    the key value

    returns

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

    Definition Classes
    MapLikeGenMapLike
  2. abstract def iterator: Iterator[(A, B)]

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

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

    returns

    the new iterator

    Definition Classes
    MapLikeIterableLikeGenIterableLike

Concrete Value Members

  1. final def !=(arg0: AnyRef): Boolean

    Definition Classes
    AnyRef
  2. final def !=(arg0: Any): Boolean

    Test two objects for inequality.

    Test two objects for inequality.

    returns

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

    Definition Classes
    Any
  3. 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
  4. def +(kvs: (A, B)*): Map[A, B]

    [use case] Adds key/value pairs to this map, returning a new map.

    [use case]

    Adds key/value pairs to this map, returning a new map.

    This method takes two or more key/value pairs. Another overloaded variant of this method handles the case where a single key/value pair is added.

    kvs

    the key/value pairs

    returns

    a new map with the given bindings added to this map

    Definition Classes
    MapLike
    Full Signature

    def +[B1 >: B](kv1: (A, B1), kv2: (A, B1), kvs: (A, B1)*): Map[A, B1]

  5. abstract def +(kv: (A, B)): Map[A, B]

    [use case] Adds a key/value pair to this map, returning a new map.

    [use case]

    Adds a key/value pair to this map, returning a new map.

    kv

    the key/value pair

    returns

    a new map with the new binding added to this map

    Definition Classes
    MapLikeGenMapLike
    Full Signature

    abstract def +[B1 >: B](kv: (A, B1)): Map[A, B1]

  6. def ++(xs: Traversable[(A, B)]): Map[A, B]

    [use case] Adds all key/value pairs in a traversable collection to this map, returning a new map.

    [use case]

    Adds all key/value pairs in a traversable collection to this map, returning a new map.

    xs

    the collection containing the added key/value pairs

    returns

    a new map with the given bindings added to this map

    Definition Classes
    MapLike
    Full Signature

    def ++[B1 >: B](xs: GenTraversableOnce[(A, B1)]): Map[A, B1]

  7. def ++[B](that: GenTraversableOnce[B]): Map[B]

    [use case] Returns a new map containing the elements from the left hand operand followed by the elements from the right hand operand.

    [use case]

    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.

    Example:

    scala> val a = LinkedList(1)
    a: scala.collection.mutable.LinkedList[Int] = LinkedList(1)
    
    scala> val b = LinkedList(2)
    b: scala.collection.mutable.LinkedList[Int] = LinkedList(2)
    
    scala> val c = a ++ b
    c: scala.collection.mutable.LinkedList[Int] = LinkedList(1, 2)
    
    scala> val d = LinkedList('a')
    d: scala.collection.mutable.LinkedList[Char] = LinkedList(a)
    
    scala> val e = c ++ d
    e: scala.collection.mutable.LinkedList[AnyVal] = LinkedList(1, 2, a)
    B

    the element type of the returned collection.

    that

    the traversable to append.

    returns

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

    Definition Classes
    TraversableLikeGenTraversableLike
    Full Signature

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

  8. def ++:[B >: (A, B), That](that: Traversable[B])(implicit bf: CanBuildFrom[Map[A, B], B, That]): That

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

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

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

    Example:

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

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

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

    B

    the element type of the returned collection.

    That

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

    that

    the traversable to append.

    bf

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

    returns

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

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

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

    [use case]

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

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

    Example:

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

    the element type of the returned collection.

    that

    the traversable to append.

    returns

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

    Definition Classes
    TraversableLike
    Full Signature

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

  10. def -(elem1: A, elem2: A, elems: A*): Map[A, B]

    Creates a new map from this map with some elements removed.

    Creates a new map from this map with some elements removed.

    This method takes two or more elements to be removed. Another overloaded variant of this method handles the case where a single element is removed.

    elem1

    the first element to remove.

    elem2

    the second element to remove.

    elems

    the remaining elements to remove.

    returns

    a new map that contains all elements of the current map except one less occurrence of each of the given elements.

    Definition Classes
    Subtractable
  11. abstract def -(key: A): Map[A, B]

    [use case] Removes a key from this map, returning a new map.

    [use case]

    Removes a key from this map, returning a new map.

    key

    the key to be removed

    returns

    a new map without a binding for key

    Definition Classes
    MapLikeSubtractableGenMapLike
    Full Signature

    abstract def -(key: A): Map[A, B]

  12. def --(xs: GenTraversableOnce[A]): Map[A, B]

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

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

    xs

    the collection containing the removed elements.

    returns

    a new map that contains all elements of the current map except one less occurrence of each of the elements of elems.

    Definition Classes
    Subtractable
  13. def ->[B](y: B): (Map[A, B], B)

    Implicit information
    This member is added by an implicit conversion from Map[A, B] to ArrowAssoc[Map[A, B]] performed by method any2ArrowAssoc in scala.Predef.
    Definition Classes
    ArrowAssoc
    Annotations
    @inline()
  14. def /:[B](z: B)(op: (B, (A, B)) ⇒ B): B

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

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

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

    Examples:

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

    scala> val a = LinkedList(1,2,3,4)
    a: scala.collection.mutable.LinkedList[Int] = LinkedList(1, 2, 3, 4)
    
    scala> val b = (5 /: a)(_+_)
    b: Int = 15
    
    scala> val c = (5 /: a)((x,y) => x + y)
    c: Int = 15

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

    B

    the result type of the binary operator.

    z

    the start value.

    op

    the binary operator.

    returns

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

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

    where x1, ..., xn are the elements of this map.

    Definition Classes
    TraversableOnceGenTraversableOnce
  15. def :\[B](z: B)(op: ((A, B), B) ⇒ B): B

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

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

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

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

    Examples:

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

    scala> val a = LinkedList(1,2,3,4)
    a: scala.collection.mutable.LinkedList[Int] = LinkedList(1, 2, 3, 4)
    
    scala> val b = (a :\ 5)(_+_)
    b: Int = 15
    
    scala> val c = (a :\ 5)((x,y) => x + y)
    c: Int = 15
    B

    the result type of the binary operator.

    z

    the start value

    op

    the binary operator

    returns

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

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

    where x1, ..., xn are the elements of this map.

    Definition Classes
    TraversableOnceGenTraversableOnce
  16. final def ==(arg0: AnyRef): Boolean

    Definition Classes
    AnyRef
  17. final def ==(arg0: Any): Boolean

    Test two objects for equality.

    Test two objects for equality. 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
    Any
  18. def addString(b: StringBuilder, start: String, sep: String, end: String): StringBuilder

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

    Appends all bindings of this map to a string builder using start, end, and separator strings. The written text begins with the string start and ends with the string end. Inside, the string representations of all bindings of this map in the form of key -> value are separated by the string sep.

    b

    the builder to which strings are appended.

    start

    the starting string.

    sep

    the separator string.

    end

    the ending string.

    returns

    the string builder b to which elements were appended.

    Definition Classes
    MapLikeTraversableOnce
  19. def addString(b: StringBuilder): StringBuilder

    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 = LinkedList(1,2,3,4)
    a: scala.collection.mutable.LinkedList[Int] = LinkedList(1, 2, 3, 4)
    
    scala> val b = new StringBuilder()
    b: StringBuilder =
    
    scala> val h = a.addString(b)
    b: StringBuilder = 1234
    b

    the string builder to which elements are appended.

    returns

    the string builder b to which elements were appended.

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

    Appends all elements of this 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 = LinkedList(1,2,3,4)
    a: scala.collection.mutable.LinkedList[Int] = LinkedList(1, 2, 3, 4)
    
    scala> val b = new StringBuilder()
    b: StringBuilder =
    
    scala> a.addString(b, ", ")
    res0: StringBuilder = 1, 2, 3, 4
    b

    the string builder to which elements are appended.

    sep

    the separator string.

    returns

    the string builder b to which elements were appended.

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

    Aggregates the results of applying an operator to subsequent elements.

    Aggregates the results of applying an operator to subsequent elements.

    This is a more general form of fold and reduce. It has similar semantics, but does not require the result to be a supertype of the element type. It traverses the elements in different partitions sequentially, using seqop to update the result, and then applies combop to results from different partitions. The implementation of this operation may operate on an arbitrary number of collection partitions, so combop may be invoked an arbitrary number of times.

    For example, one might want to process some elements and then produce a Set. In this case, seqop would process an element and append it to the list, while combop would concatenate two lists from different partitions together. The initial value z would be an empty set.

    pc.aggregate(Set[Int]())(_ += process(_), _ ++ _)

    Another example is calculating geometric mean from a collection of doubles (one would typically require big doubles for this).

    B

    the type of accumulated results

    z

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

    seqop

    an operator used to accumulate results within a partition

    combop

    an associative operator used to combine results from different partitions

    Definition Classes
    TraversableOnceGenTraversableOnce
  22. def andThen[C](k: (B) ⇒ C): PartialFunction[A, C]

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

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

    C

    the result type of the transformation function.

    k

    the transformation function

    returns

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

    Definition Classes
    PartialFunctionFunction1
  23. def apply(key: A): B

    Retrieves the value which is associated with the given key.

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

    key

    the key

    returns

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

    Definition Classes
    MapLikeGenMapLikeFunction1
  24. def applyOrElse[A1 <: A, B1 >: B](x: A1, default: (A1) ⇒ B1): B1

    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 compiler generates 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
    PartialFunction
    Since

    2.10

  25. final def asInstanceOf[T0]: T0

    Cast the receiver object to be of type T0.

    Cast the receiver object to be of type T0.

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

    returns

    the receiver object.

    Definition Classes
    Any
    Exceptions thrown
    ClassCastException

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

  26. def asParIterable: ParIterable[(A, B)]

    Implicit information
    This member is added by an implicit conversion from Map[A, B] to TraversableOps[(A, B)] performed by method traversable2ops in scala.collection.parallel.
    Definition Classes
    TraversableOps
  27. def asParSeq: ParSeq[(A, B)]

    Implicit information
    This member is added by an implicit conversion from Map[A, B] to TraversableOps[(A, B)] performed by method traversable2ops in scala.collection.parallel.
    Definition Classes
    TraversableOps
  28. def canEqual(that: Any): Boolean

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

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

    that

    The object with which this map should be compared

    returns

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

    Definition Classes
    IterableLikeEquals
  29. 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[java.lang]
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
    Note

    not specified by SLS as a member of AnyRef

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

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

    [use case]

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

    B

    the element type of the returned collection.

    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
    TraversableLikeGenTraversableLike
    Full Signature

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

  31. def collectFirst[B](pf: PartialFunction[(A, B), 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: might return different results for different runs, unless the underlying collection type is ordered.

    pf

    the partial function

    returns

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

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

  32. def companion: GenericCompanion[Iterable]

    The factory companion object that builds instances of class Map.

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

    Definition Classes
    IterableGenIterableTraversableGenTraversableGenericTraversableTemplate
  33. def compose[A](g: (A) ⇒ A): (A) ⇒ B

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

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

    A

    the type to which function g can be applied

    g

    a function A => T1

    returns

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

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

    Tests whether this map contains a binding for a key.

    Tests whether this map contains a binding for a key.

    key

    the key

    returns

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

    Definition Classes
    MapLikeGenMapLike
  35. def copyToArray(xs: Array[A], start: Int, len: Int): Unit

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

    [use case]

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

    xs

    the array to fill.

    start

    the starting index.

    len

    the maximal number of elements to copy.

    Definition Classes
    IterableLikeTraversableLikeTraversableOnceGenTraversableOnce
    Full Signature

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

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

    [use case] Copies values of this map to an array.

    [use case]

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

    xs

    the array to fill.

    Definition Classes
    TraversableOnceGenTraversableOnce
    Full Signature

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

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

    [use case] Copies values of this map to an array.

    [use case]

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

    xs

    the array to fill.

    start

    the starting index.

    Definition Classes
    TraversableOnceGenTraversableOnce
    Full Signature

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

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

    Copies all elements of this map to a buffer.

    Copies all elements of this map to a buffer.

    dest

    The buffer to which elements are copied.

    Definition Classes
    TraversableOnce
  39. def count(p: ((A, B)) ⇒ 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.

    p

    the predicate used to test elements.

    returns

    the number of elements satisfying the predicate p.

    Definition Classes
    TraversableOnceGenTraversableOnce
  40. def default(key: A): B

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

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

    key

    the given key value for which a binding is missing.

    Definition Classes
    MapLikeGenMapLike
    Exceptions thrown
    `NoSuchElementException`

  41. def drop(n: Int): Map[A, B]

    Selects all elements except first n ones.

    Selects all elements except first n ones.

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

    n

    the number of elements to drop from this 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.

    Definition Classes
    IterableLikeTraversableLikeGenTraversableLike
  42. def dropRight(n: Int): Map[A, B]

    Selects all elements except last n ones.

    Selects all elements except last n ones.

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

    n

    The number of elements to take

    returns

    a 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.

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

    Drops longest prefix of elements that satisfy a predicate.

    Drops longest prefix of elements that satisfy a predicate.

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

    returns

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

    Definition Classes
    TraversableLikeGenTraversableLike
  44. def empty: Map[A, B]

    The empty map of the same type as this map

    The empty map of the same type as this map

    returns

    an empty map of type This.

    Definition Classes
    MapMapLike
  45. def ensuring(cond: (Map[A, B]) ⇒ Boolean, msg: ⇒ Any): Map[A, B]

    Implicit information
    This member is added by an implicit conversion from Map[A, B] to Ensuring[Map[A, B]] performed by method any2Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  46. def ensuring(cond: (Map[A, B]) ⇒ Boolean): Map[A, B]

    Implicit information
    This member is added by an implicit conversion from Map[A, B] to Ensuring[Map[A, B]] performed by method any2Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  47. def ensuring(cond: Boolean, msg: ⇒ Any): Map[A, B]

    Implicit information
    This member is added by an implicit conversion from Map[A, B] to Ensuring[Map[A, B]] performed by method any2Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  48. def ensuring(cond: Boolean): Map[A, B]

    Implicit information
    This member is added by an implicit conversion from Map[A, B] to Ensuring[Map[A, B]] performed by method any2Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  49. final def eq(arg0: AnyRef): Boolean

    Tests whether the argument (arg0) is a reference to the receiver object (this).

    Tests whether the argument (arg0) 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
  50. def equals(that: Any): Boolean

    Compares two maps structurally; i.

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

    that

    the other map

    returns

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

    Definition Classes
    GenMapLikeEquals → AnyRef → Any
  51. def exists(p: ((A, B)) ⇒ Boolean): Boolean

    Tests whether a predicate holds for some of the elements of this map.

    Tests whether a predicate holds for some of the elements of this map.

    p

    the predicate used to test elements.

    returns

    true if the given predicate p holds for some of the elements of this map, otherwise false.

    Definition Classes
    IterableLikeTraversableLikeTraversableOnceGenTraversableOnce
  52. def filter(p: ((A, B)) ⇒ Boolean): Map[A, B]

    Selects all elements of this map which satisfy a predicate.

    Selects all elements of this map which satisfy a predicate.

    p

    the predicate used to test elements.

    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
    TraversableLikeGenTraversableLike
  53. def filterKeys(p: (A) ⇒ Boolean): Map[A, B]

    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
    MapLikeGenMapLike
  54. def filterNot(p: ((A, B)) ⇒ Boolean): Map[A, B]

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

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

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

    p

    A predicate over key-value pairs

    returns

    A new map containing elements not satisfying the predicate.

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

    not specified by SLS as a member of AnyRef

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

    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: 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
    IterableLikeTraversableLikeTraversableOnceGenTraversableOnce
  57. def flatMap[B](f: (A) ⇒ GenTraversableOnce[B]): Map[B]

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

    [use case]

    Builds a new collection 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 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 a 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
    TraversableLikeGenTraversableLikeFilterMonadic
    Full Signature

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

  58. def flatten[B]: Map[B]

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

    [use case]

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

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

    val xs = List(Set(1, 2, 3), Set(1, 2, 3))
    // xs == List(1, 2, 3, 1, 2, 3)
    
    val ys = Set(List(1, 2, 3), List(3, 2, 1))
    // ys == Set(1, 2, 3)
    B

    the type of the elements of each traversable collection.

    returns

    a new map resulting from concatenating all element maps.

    Definition Classes
    GenericTraversableTemplate
    Full Signature

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

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

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

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

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

    A1

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

    z

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

    op

    a binary operator that must be associative

    returns

    the result of applying fold operator op between all the elements and z

    Definition Classes
    TraversableOnceGenTraversableOnce
  60. def foldLeft[B](z: B)(op: (B, (A, B)) ⇒ B): B

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

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

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

    B

    the result type of the binary operator.

    z

    the start value.

    op

    the binary operator.

    returns

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

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

    where x1, ..., xn are the elements of this map.

    Definition Classes
    TraversableOnceGenTraversableOnce
  61. def foldRight[B](z: B)(op: ((A, B), B) ⇒ B): B

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

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

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

    B

    the result type of the binary operator.

    z

    the start value.

    op

    the binary operator.

    returns

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

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

    where x1, ..., xn are the elements of this map.

    Definition Classes
    IterableLikeTraversableOnceGenTraversableOnce
  62. def forall(p: ((A, B)) ⇒ Boolean): Boolean

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

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

    p

    the predicate used to test elements.

    returns

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

    Definition Classes
    IterableLikeTraversableLikeTraversableOnceGenTraversableOnce
  63. def foreach(f: ((A, B)) ⇒ Unit): Unit

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

    [use case]

    Applies a function f to all elements of this map.

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

    f

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

    Definition Classes
    IterableLikeTraversableLikeGenTraversableLikeTraversableOnceGenTraversableOnceFilterMonadic
    Full Signature

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

  64. 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 information
    This member is added by an implicit conversion from Map[A, B] to StringFormat performed by method any2stringfmt in scala.Predef.
    Definition Classes
    StringFormat
    Annotations
    @inline()
  65. def genericBuilder[B]: Builder[B, Iterable[B]]

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

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

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

    A representation that corresponds to the dynamic class of the receiver object.

    A representation that corresponds to the dynamic class of the receiver object.

    The nature of the representation is platform dependent.

    returns

    a representation that corresponds to the dynamic class of the receiver object.

    Definition Classes
    AnyRef → Any
    Note

    not specified by SLS as a member of AnyRef

  67. def getOrElse(key: A, default: ⇒ B): B

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

    [use case]

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

    key

    the key.

    default

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

    returns

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

    Definition Classes
    MapLikeGenMapLike
    Full Signature

    def getOrElse[B1 >: B](key: A, default: ⇒ B1): B1

  68. def groupBy[K](f: ((A, B)) ⇒ K): immutable.Map[K, Map[A, B]]

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

    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 partition 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
    TraversableLikeGenTraversableLike
  69. def grouped(size: Int): Iterator[Map[A, B]]

    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 truncated if the elements don't divide evenly.

    Definition Classes
    IterableLike
    See also

    scala.collection.Iterator, method grouped

  70. 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.

    Note: many collection methods will not work on collections of infinite sizes.

    returns

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

    Definition Classes
    TraversableLikeTraversableOnceGenTraversableOnce
  71. def hashCode(): Int

    The hashCode method for reference types.

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

    returns

    the hash code value for this object.

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

    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
    IterableLikeTraversableLikeGenTraversableLike
    Exceptions thrown
    `NoSuchElementException`

    if the map is empty.

  73. def headOption: Option[(A, B)]

    Optionally selects the first element.

    Optionally selects the first element.

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

    returns

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

    Definition Classes
    TraversableLikeGenTraversableLike
  74. def ifParSeq[R](isbody: (ParSeq[(A, B)]) ⇒ R): (TraversableOps[(A, B)])#Otherwise[R]

    Implicit information
    This member is added by an implicit conversion from Map[A, B] to TraversableOps[(A, B)] performed by method traversable2ops in scala.collection.parallel.
    Definition Classes
    TraversableOps
  75. def init: Map[A, B]

    Selects all elements except the last.

    Selects all elements except the last.

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

    returns

    a map consisting of all elements of this map except the last one.

    Definition Classes
    TraversableLikeGenTraversableLike
    Exceptions thrown
    `UnsupportedOperationException`

    if the map is empty.

  76. def inits: Iterator[Map[A, B]]

    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.

    returns

    an iterator over all the inits of this map

    Definition Classes
    TraversableLike
    Example:
    1. List(1,2,3).inits = Iterator(List(1,2,3), List(1,2), List(1), Nil)

  77. def isDefinedAt(key: A): Boolean

    Tests whether this map contains a binding for a key.

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

    key

    the key

    returns

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

    Definition Classes
    MapLikeGenMapLikePartialFunction
  78. def isEmpty: Boolean

    Tests whether the map is empty.

    Tests whether the map is empty.

    returns

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

    Definition Classes
    MapLikeIterableLikeTraversableLikeTraversableOnceGenTraversableOnce
  79. final def isInstanceOf[T0]: Boolean

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

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

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

    returns

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

    Definition Classes
    Any
  80. def isParIterable: Boolean

    Implicit information
    This member is added by an implicit conversion from Map[A, B] to TraversableOps[(A, B)] performed by method traversable2ops in scala.collection.parallel.
    Definition Classes
    TraversableOps
  81. def isParSeq: Boolean

    Implicit information
    This member is added by an implicit conversion from Map[A, B] to TraversableOps[(A, B)] performed by method traversable2ops in scala.collection.parallel.
    Definition Classes
    TraversableOps
  82. def isParallel: Boolean

    Implicit information
    This member is added by an implicit conversion from Map[A, B] to TraversableOps[(A, B)] performed by method traversable2ops in scala.collection.parallel.
    Definition Classes
    TraversableOps
  83. final def isTraversableAgain: Boolean

    Tests whether this map can be repeatedly traversed.

    Tests whether this map can be repeatedly traversed.

    returns

    true

    Definition Classes
    TraversableLikeGenTraversableLikeGenTraversableOnce
  84. def keySet: Set[A]

    Collects all keys of this map in a set.

    Collects all keys of this map in a set.

    returns

    a set containing all keys of this map.

    Definition Classes
    MapLikeGenMapLike
  85. def keys: Iterable[A]

    Collects all keys of this map in an iterable collection.

    Collects all keys of this map in an iterable collection.

    returns

    the keys of this map as an iterable.

    Definition Classes
    MapLikeGenMapLike
    Annotations
    @migration
    Migration

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

  86. def keysIterator: Iterator[A]

    Creates an iterator for all keys.

    Creates an iterator for all keys.

    returns

    an iterator over all keys.

    Definition Classes
    MapLikeGenMapLike
  87. def last: (A, B)

    Selects the last element.

    Selects the last element.

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

    returns

    The last element of this map.

    Definition Classes
    TraversableLikeGenTraversableLike
    Exceptions thrown
    NoSuchElementException

    If the map is empty.

  88. def lastOption: Option[(A, B)]

    Optionally selects the last element.

    Optionally selects the last element.

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

    returns

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

    Definition Classes
    TraversableLikeGenTraversableLike
  89. def lift: (A) ⇒ Option[B]

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

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

    returns

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

    Definition Classes
    PartialFunction
    See also

    Function.unlift

  90. def map[B](f: (A) ⇒ B): Map[B]

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

    [use case]

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

    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 function f to each element of this map and collecting the results.

    Definition Classes
    TraversableLikeGenTraversableLikeFilterMonadic
    Full Signature

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

  91. def mapValues[C](f: (B) ⇒ C): Map[A, C]

    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
    MapLikeGenMapLike
  92. def max: A

    [use case] Finds the largest element.

    [use case]

    Finds the largest element.

    returns

    the largest element of this map.

    Definition Classes
    TraversableOnceGenTraversableOnce
    Full Signature

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

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

    Definition Classes
    TraversableOnceGenTraversableOnce
  94. def min: A

    [use case] Finds the smallest element.

    [use case]

    Finds the smallest element.

    returns

    the smallest element of this map

    Definition Classes
    TraversableOnceGenTraversableOnce
    Full Signature

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

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

    Definition Classes
    TraversableOnceGenTraversableOnce
  96. def mkString: String

    Displays all elements of this map in a string.

    Displays all elements of this map in a 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 follow each other without any separator string.

    Definition Classes
    TraversableOnceGenTraversableOnce
  97. 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.

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

  98. 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.

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

  99. 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
  100. def newBuilder: Builder[(A, B), Map[A, B]]

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

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

    Attributes
    protected[this]
    Definition Classes
    MapLikeTraversableLikeHasNewBuilder
  101. 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
    TraversableOnceGenTraversableOnce
  102. 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
    Note

    not specified by SLS as a member of AnyRef

  103. 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
    Note

    not specified by SLS as a member of AnyRef

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

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

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

    A1

    the argument type of the fallback function

    B1

    the result type of the fallback function

    that

    the fallback function

    returns

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

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

    Returns a parallel implementation of this collection.

    Returns a parallel implementation of this collection.

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

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

    All parallel collections return a reference to themselves.

    returns

    a parallel implementation of this collection

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

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

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

    returns

    a combiner for the parallel collection of type ParRepr

    Attributes
    protected[this]
    Definition Classes
    MapLikeTraversableLikeParallelizable
  107. def partition(p: ((A, B)) ⇒ Boolean): (Map[A, B], Map[A, B])

    Partitions this map in two maps according to a predicate.

    Partitions this map in two maps according to a predicate.

    p

    the predicate on which to partition.

    returns

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

    Definition Classes
    TraversableLikeGenTraversableLike
  108. def product: A

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

    [use case]

    Multiplies up the elements of this collection.

    returns

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

    Definition Classes
    TraversableOnceGenTraversableOnce
    Full Signature

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

  109. def reduce[A1 >: (A, B)](op: (A1, A1) ⇒ A1): A1

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

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

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

    A1

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

    op

    A binary operator that must be associative.

    returns

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

    Definition Classes
    TraversableOnceGenTraversableOnce
    Exceptions thrown
    UnsupportedOperationException

    if this map is empty.

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

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

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

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

    B

    the result type of the binary operator.

    op

    the binary operator.

    returns

    the result of inserting op between consecutive elements of this map, going left to right:

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

    where x1, ..., xn are the elements of this map.

    Definition Classes
    TraversableOnce
    Exceptions thrown
    `UnsupportedOperationException`

    if this map is empty.

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

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

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

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

    B

    the result type of the binary operator.

    op

    the binary operator.

    returns

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

    Definition Classes
    TraversableOnceGenTraversableOnce
  112. def reduceOption[A1 >: (A, B)](op: (A1, A1) ⇒ A1): Option[A1]

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

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

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

    A1

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

    op

    A binary operator that must be associative.

    returns

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

    Definition Classes
    TraversableOnceGenTraversableOnce
  113. def reduceRight[B >: (A, B)](op: ((A, B), B) ⇒ B): B

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

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

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

    B

    the result type of the binary operator.

    op

    the binary operator.

    returns

    the result of inserting op between consecutive elements of this map, going right to left:

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

    where x1, ..., xn are the elements of this map.

    Definition Classes
    IterableLikeTraversableOnceGenTraversableOnce
    Exceptions thrown
    `UnsupportedOperationException`

    if this map is empty.

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

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

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

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

    B

    the result type of the binary operator.

    op

    the binary operator.

    returns

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

    Definition Classes
    TraversableOnceGenTraversableOnce
  115. def repr: Map[A, B]

    The collection of type map underlying this TraversableLike object.

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

    Definition Classes
    TraversableLikeGenTraversableLike
  116. def reversed: List[(A, B)]

    Attributes
    protected[this]
    Definition Classes
    TraversableOnce
  117. def runWith[U](action: (B) ⇒ U): (A) ⇒ Boolean

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

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

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

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

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

    action

    the action function

    returns

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

    Definition Classes
    PartialFunction
    Since

    2.10

    See also

    applyOrElse.

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

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

    [use case]

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

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

    that

    the collection to compare with.

    returns

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

    Definition Classes
    IterableLikeGenIterableLike
    Full Signature

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

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

    Computes a prefix scan of the elements of the collection.

    Computes a prefix scan of the elements of the collection.

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

    B

    element type of the resulting collection

    That

    type of the resulting collection

    z

    neutral element for the operator op

    op

    the associative operator for the scan

    cbf

    combiner factory which provides a combiner

    returns

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

    Definition Classes
    TraversableLikeGenTraversableLike
  120. def scanLeft[B, That](z: B)(op: (B, (A, B)) ⇒ B)(implicit bf: CanBuildFrom[Map[A, B], B, That]): That

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

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

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

    B

    the type of the elements in the resulting collection

    That

    the actual type of the resulting collection

    z

    the initial value

    op

    the binary operator applied to the intermediate result and the element

    bf

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

    returns

    collection with intermediate results

    Definition Classes
    TraversableLikeGenTraversableLike
  121. def scanRight[B, That](z: B)(op: ((A, B), B) ⇒ B)(implicit bf: CanBuildFrom[Map[A, B], B, That]): That

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

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

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

    Example:

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

    the type of the elements in the resulting collection

    That

    the actual type of the resulting collection

    z

    the initial value

    op

    the binary operator applied to the intermediate result and the element

    bf

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

    returns

    collection with intermediate results

    Definition Classes
    TraversableLikeGenTraversableLike
    Annotations
    @migration
    Migration

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

  122. def seq: Map[A, B]

    A version of this collection with all of the operations implemented sequentially (i.

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

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

    returns

    a sequential view of the collection.

    Definition Classes
    MapGenMapGenMapLikeIterableGenIterableTraversableGenTraversableParallelizableTraversableOnceGenTraversableOnce
  123. def size: Int

    The size of this map.

    The size of this map.

    returns

    the number of elements in this map.

    Definition Classes
    TraversableOnceGenTraversableOnce
  124. def slice(from: Int, until: Int): Map[A, B]

    Selects an interval of elements.

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

    from <= indexOf(x) < until

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

    returns

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

    Definition Classes
    IterableLikeTraversableLikeGenTraversableLike
  125. def sliding(size: Int, step: Int): Iterator[Map[A, B]]

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

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

    size

    the number of elements per group

    step

    the distance between the first elements of successive groups (defaults to 1)

    returns

    An iterator producing maps of size size, except the last and the only element will be truncated if there are fewer elements than size.

    Definition Classes
    IterableLike
    See also

    scala.collection.Iterator, method sliding

  126. def sliding(size: Int): Iterator[Map[A, B]]

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

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

    size

    the number of elements per group

    returns

    An iterator producing maps of size size, except the last and the only element will be truncated if there are fewer elements than size.

    Definition Classes
    IterableLike
    See also

    scala.collection.Iterator, method sliding

  127. def span(p: ((A, B)) ⇒ Boolean): (Map[A, B], Map[A, B])

    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.

    returns

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

    Definition Classes
    TraversableLikeGenTraversableLike
  128. def splitAt(n: Int): (Map[A, B], Map[A, B])

    Splits this map into two at a given position.

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

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

    n

    the position at which to split.

    returns

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

    Definition Classes
    TraversableLikeGenTraversableLike
  129. def stringPrefix: String

    Defines the prefix of this object's toString representation.

    Defines the prefix of this object's toString representation.

    returns

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

    Definition Classes
    MapLikeTraversableLikeGenTraversableLike
  130. def sum: A

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

    [use case]

    Sums up the elements of this collection.

    returns

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

    Definition Classes
    TraversableOnceGenTraversableOnce
    Full Signature

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

  131. final def synchronized[T0](arg0: ⇒ T0): T0

    Definition Classes
    AnyRef
  132. def tail: Map[A, B]

    Selects all elements except the first.

    Selects all elements except the first.

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

    returns

    a map consisting of all elements of this map except the first one.

    Definition Classes
    TraversableLikeGenTraversableLike
    Exceptions thrown
    `UnsupportedOperationException`

    if the map is empty.

  133. def tails: Iterator[Map[A, B]]

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

  134. def take(n: Int): Map[A, B]

    Selects first n elements.

    Selects first n elements.

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

    n

    the number of elements to take from this 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.

    Definition Classes
    IterableLikeTraversableLikeGenTraversableLike
  135. def takeRight(n: Int): Map[A, B]

    Selects last n elements.

    Selects last n elements.

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

    n

    the number of elements to take

    returns

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

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

    Takes longest prefix of elements that satisfy a predicate.

    Takes longest prefix of elements that satisfy a predicate.

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

    returns

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

    Definition Classes
    IterableLikeTraversableLikeGenTraversableLike
  137. def thisCollection: Iterable[(A, B)]

    The underlying collection seen as an instance of Map.

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

    Attributes
    protected[this]
    Definition Classes
    IterableLikeTraversableLike
  138. def to[Col[_]]: Col[A]

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

    [use case]

    Converts this map into another by copying all elements.

    Col

    The collection type to build.

    returns

    a new collection containing all elements of this map.

    Definition Classes
    TraversableLikeTraversableOnceGenTraversableOnce
    Full Signature

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

  139. def toArray: Array[A]

    [use case] Converts this map to an array.

    [use case]

    Converts this map to an array.

    returns

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

    Definition Classes
    TraversableOnceGenTraversableOnce
    Full Signature

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

  140. def toBuffer[C >: (A, B)]: Buffer[C]

    Converts this map to a mutable buffer.

    Converts this map to a mutable buffer.

    returns

    a buffer containing all elements of this map.

    Definition Classes
    MapLikeTraversableOnceGenTraversableOnce
  141. def toCollection(repr: Map[A, B]): Iterable[(A, B)]

    A conversion from collections of type Repr to Map objects.

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

    Attributes
    protected[this]
    Definition Classes
    IterableLikeTraversableLike
  142. def toIndexedSeq: immutable.IndexedSeq[(A, B)]

    Converts this map to an indexed sequence.

    Converts this map to an indexed sequence.

    returns

    an indexed sequence containing all elements of this map.

    Definition Classes
    TraversableOnceGenTraversableOnce
  143. def toIterable: Iterable[(A, B)]

    Converts this map to an iterable collection.

    Converts this map to an iterable collection. Note that the choice of target Iterable is lazy in this default implementation as this TraversableOnce may be lazy and unevaluated (i.e. it may be an iterator which is only traversable once).

    returns

    an Iterable containing all elements of this map.

    Definition Classes
    IterableLikeTraversableOnceGenTraversableOnce
  144. def toIterator: Iterator[(A, B)]

    Returns an Iterator over the elements in this map.

    Returns an Iterator over the elements in this map. Will return the same Iterator if this instance is already an Iterator.

    returns

    an Iterator containing all elements of this map.

    Definition Classes
    IterableLikeTraversableLikeGenTraversableOnce
  145. def toList: List[(A, B)]

    Converts this map to a list.

    Converts this map to a list.

    returns

    a list containing all elements of this map.

    Definition Classes
    TraversableOnceGenTraversableOnce
  146. def toMap[T, U]: Map[T, U]

    [use case] Converts this map to a map.

    [use case]

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

    returns

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

    Definition Classes
    TraversableOnceGenTraversableOnce
    Full Signature

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

  147. def toParArray: ParArray[(A, B)]

    Implicit information
    This member is added by an implicit conversion from Map[A, B] to TraversableOps[(A, B)] performed by method traversable2ops in scala.collection.parallel.
    Definition Classes
    TraversableOps
  148. def toSeq: Seq[(A, B)]

    Converts this map to a sequence.

    Converts this map to a sequence. As with toIterable, it's lazy in this default implementation, as this TraversableOnce may be lazy and unevaluated.

    returns

    a sequence containing all elements of this map.

    Definition Classes
    MapLikeTraversableOnceGenTraversableOnce
  149. def toSet[B >: (A, B)]: immutable.Set[B]

    Converts this map to a set.

    Converts this map to a set.

    returns

    a set containing all elements of this map.

    Definition Classes
    TraversableOnceGenTraversableOnce
  150. def toStream: immutable.Stream[(A, B)]

    Converts this map to a stream.

    Converts this map to a stream.

    returns

    a stream containing all elements of this map.

    Definition Classes
    IterableLikeTraversableLikeGenTraversableOnce
  151. def toString(): String

    Converts this map to a string.

    Converts this map to a string.

    returns

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

    Definition Classes
    MapLikeTraversableLikeFunction1 → AnyRef → Any
  152. def toTraversable: Traversable[(A, B)]

    Converts this map to an unspecified Traversable.

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

    returns

    a Traversable containing all elements of this map.

    Definition Classes
    TraversableLikeTraversableOnceGenTraversableOnce
  153. def toVector: Vector[(A, B)]

    Converts this map to a Vector.

    Converts this map to a Vector.

    returns

    a vector containing all elements of this map.

    Definition Classes
    TraversableOnceGenTraversableOnce
  154. def transpose[B](implicit asTraversable: ((A, B)) ⇒ GenTraversableOnce[B]): Iterable[Iterable[B]]

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

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

    B

    the type of the elements of each traversable collection.

    asTraversable

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

    returns

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

    Definition Classes
    GenericTraversableTemplate
    Annotations
    @migration
    Migration

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

    Exceptions thrown
    `IllegalArgumentException`

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

  155. def unzip[A1, A2](implicit asPair: ((A, B)) ⇒ (A1, A2)): (Iterable[A1], Iterable[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.

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

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

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

    Definition Classes
    GenericTraversableTemplate
  157. def updated(key: A, value: B): Map[A, B]

    [use case] Creates a new map obtained by updating this map with a given key/value pair.

    [use case]

    Creates a new map obtained by updating this map with a given key/value pair.

    key

    the key

    value

    the value

    returns

    A new map with the new key/value mapping added to this map.

    Definition Classes
    MapLike
    Full Signature

    def updated[B1 >: B](key: A, value: B1): Map[A, B1]

  158. def values: Iterable[B]

    Collects all values of this map in an iterable collection.

    Collects all values of this map in an iterable collection.

    returns

    the values of this map as an iterable.

    Definition Classes
    MapLikeGenMapLike
    Annotations
    @migration
    Migration

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

  159. def valuesIterator: Iterator[B]

    Creates an iterator for all values in this map.

    Creates an iterator for all values in this map.

    returns

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

    Definition Classes
    MapLikeGenMapLike
  160. def view(from: Int, until: Int): IterableView[(A, B), Map[A, B]]

    Creates a non-strict view of a slice of this map.

    Creates a non-strict view of a slice of this map.

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

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

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

    from

    the index of the first element of the view

    until

    the index of the element following the view

    returns

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

    Definition Classes
    IterableLikeTraversableLike
  161. def view: IterableView[(A, B), Map[A, B]]

    Creates a non-strict view of this map.

    Creates a non-strict view of this map.

    returns

    a non-strict view of this map.

    Definition Classes
    IterableLikeTraversableLike
  162. final def wait(): Unit

    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  163. final def wait(arg0: Long, arg1: Int): Unit

    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  164. final def wait(arg0: Long): Unit

    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  165. def withFilter(p: ((A, B)) ⇒ Boolean): FilterMonadic[(A, B), Map[A, B]]

    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
    TraversableLikeFilterMonadic
  166. def zip[B](that: GenIterable[B]): Map[(A, B)]

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

    [use case]

    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.

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

    B

    the type of the second half of the returned pairs

    that

    The iterable providing the second half of each result pair

    returns

    a new 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
    IterableLikeGenIterableLike
    Full Signature

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

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

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

    [use case]

    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.

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

    B

    the type of the second half of the returned pairs

    that

    The iterable providing the second half of each result pair

    thisElem

    the element to be used to fill up the result if this 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
    IterableLikeGenIterableLike
    Full Signature

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

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

    [use case] Zips this map with its indices.

    [use case]

    Zips this map with its indices.

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

    returns

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

    Definition Classes
    IterableLikeGenIterableLike
    Full Signature

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

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

  169. def [B](y: B): (Map[A, B], B)

    Implicit information
    This member is added by an implicit conversion from Map[A, B] to ArrowAssoc[Map[A, B]] performed by method any2ArrowAssoc in scala.Predef.
    Definition Classes
    ArrowAssoc

Shadowed Implicit Value Members

  1. def +(other: String): String

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

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

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

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

    Implicit information
    This member is added by an implicit conversion from Map[A, B] to StringAdd performed by method any2stringadd in scala.Predef.
    Shadowing
    This implicitly inherited member is ambiguous. One or more implicitly inherited members have similar signatures, so calling this member may produce an ambiguous implicit conversion compiler error.
    To access this member you can use a type ascription:
    (map: StringAdd).self
    Definition Classes
    StringAdd
  6. val self: Any

    Implicit information
    This member is added by an implicit conversion from Map[A, B] to StringFormat performed by method any2stringfmt in scala.Predef.
    Shadowing
    This implicitly inherited member is ambiguous. One or more implicitly inherited members have similar signatures, so calling this member may produce an ambiguous implicit conversion compiler error.
    To access this member you can use a type ascription:
    (map: StringFormat).self
    Definition Classes
    StringFormat
  7. def withFilter(p: ((A, B)) ⇒ Boolean): Iterator[(A, B)]

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

Deprecated Value Members

  1. def /:\[A1 >: (A, B)](z: A1)(op: (A1, A1) ⇒ A1): A1

    A syntactic sugar for out of order folding.

    A syntactic sugar for out of order folding. See fold.

    Example:

    scala> val a = LinkedList(1,2,3,4)
    a: scala.collection.mutable.LinkedList[Int] = LinkedList(1, 2, 3, 4)
    
    scala> val b = (a /:\ 5)(_+_)
    b: Int = 15
    Definition Classes
    GenTraversableOnce
    Annotations
    @deprecated
    Deprecated

    (Since version 2.10.0) use fold instead

  2. def x: Map[A, B]

    Implicit information
    This member is added by an implicit conversion from Map[A, B] to ArrowAssoc[Map[A, B]] performed by method any2ArrowAssoc in scala.Predef.
    Shadowing
    This implicitly inherited member is ambiguous. One or more implicitly inherited members have similar signatures, so calling this member may produce an ambiguous implicit conversion compiler error.
    To access this member you can use a type ascription:
    (map: ArrowAssoc[Map[A, B]]).x
    Definition Classes
    ArrowAssoc
    Annotations
    @deprecated
    Deprecated

    (Since version 2.10.0) Use leftOfArrow instead

  3. def x: Map[A, B]

    Implicit information
    This member is added by an implicit conversion from Map[A, B] to Ensuring[Map[A, B]] performed by method any2Ensuring in scala.Predef.
    Shadowing
    This implicitly inherited member is ambiguous. One or more implicitly inherited members have similar signatures, so calling this member may produce an ambiguous implicit conversion compiler error.
    To access this member you can use a type ascription:
    (map: Ensuring[Map[A, B]]).x
    Definition Classes
    Ensuring
    Annotations
    @deprecated
    Deprecated

    (Since version 2.10.0) Use resultOfEnsuring instead

Inherited from MapLike[A, B, Map[A, B]]

Inherited from Subtractable[A, Map[A, B]]

Inherited from PartialFunction[A, B]

Inherited from (A) ⇒ B

Inherited from GenMap[A, B]

Inherited from GenMapLike[A, B, Map[A, B]]

Inherited from Iterable[(A, B)]

Inherited from IterableLike[(A, B), Map[A, B]]

Inherited from Equals

Inherited from GenIterable[(A, B)]

Inherited from GenIterableLike[(A, B), Map[A, B]]

Inherited from Traversable[(A, B)]

Inherited from GenTraversable[(A, B)]

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

Inherited from TraversableLike[(A, B), Map[A, B]]

Inherited from GenTraversableLike[(A, B), Map[A, B]]

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

Inherited from TraversableOnce[(A, B)]

Inherited from GenTraversableOnce[(A, B)]

Inherited from FilterMonadic[(A, B), Map[A, B]]

Inherited from HasNewBuilder[(A, B), Map[A, B]]

Inherited from AnyRef

Inherited from Any

Inherited by implicit conversion traversable2ops from Map[A, B] to TraversableOps[(A, B)]

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

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

Inherited by implicit conversion any2stringfmt from Map[A, B] to StringFormat

Inherited by implicit conversion any2ArrowAssoc from Map[A, B] to ArrowAssoc[Map[A, B]]

Inherited by implicit conversion any2Ensuring from Map[A, B] to Ensuring[Map[A, B]]

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

Ungrouped