scala.collection.immutable

MapLike

trait MapLike [A, +B, +This <: MapLike[A, B, This] with Map[A, B]] extends MapLike[A, B, This] with Parallelizable[(A, B), ParMap[A, B]]

A generic template for immutable maps from keys of type A to values of type B. To implement a concrete map, you need to provide implementations of the following methods (where This is the type of the actual map implementation):

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

If you wish that transformer methods like take, drop, filter 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.

Self Type
MapLike[A, B, This]
Source
MapLike.scala
Version

2.8

Since

2.8

Linear Supertypes
MapLike[A, B, This], Subtractable[A, This], GenMapLike[A, B, This], IterableLike[(A, B), This], GenIterableLike[(A, B), This], TraversableLike[(A, B), This], GenTraversableLike[(A, B), This], Parallelizable[(A, B), ParMap[A, B]], TraversableOnce[(A, B)], GenTraversableOnce[(A, B)], FilterMonadic[(A, B), This], HasNewBuilder[(A, B), This], Equals, PartialFunction[A, B], (A) ⇒ B, AnyRef, Any
Known Subclasses
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  1. MapLike
  2. MapLike
  3. Subtractable
  4. GenMapLike
  5. IterableLike
  6. GenIterableLike
  7. TraversableLike
  8. GenTraversableLike
  9. Parallelizable
  10. TraversableOnce
  11. GenTraversableOnce
  12. FilterMonadic
  13. HasNewBuilder
  14. Equals
  15. PartialFunction
  16. Function1
  17. AnyRef
  18. Any
Visibility
  1. Public
  2. All

Type Members

  1. class DefaultKeySet extends Set[A]

    The implementation class of the set returned by keySet.

  2. class DefaultValuesIterable extends Iterable[B]

    The implementation class of the iterable returned by values.

  3. class ImmutableDefaultKeySet extends DefaultKeySet with Set[A]

    Attributes
    protected
  4. type Self = This

    The type implementing this traversable

    The type implementing this traversable

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

    A class supporting filtered operations.

Abstract Value Members

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

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

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

    B1

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

    kv

    the key/value pair.

    returns

    A new map with the new binding added to this map.

    Attributes
    abstract
    Definition Classes
    MapLikeMapLikeGenMapLike
  2. def - (key: A): This

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

    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

    Attributes
    abstract
    Definition Classes
    MapLikeSubtractableGenMapLike
  3. def empty : This

    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.

    Attributes
    abstract
    Definition Classes
    MapLike
  4. 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.

    Attributes
    abstract
    Definition Classes
    MapLikeGenMapLike
  5. 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

    Attributes
    abstract
    Definition Classes
    MapLikeIterableLikeGenIterableLike
  6. def seq : Map[A, B]

    Attributes
    abstract
    Definition Classes
    GenMapLikeParallelizableGenTraversableOnce

Concrete Value Members

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

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

    Test two objects for inequality.

    Test two objects for inequality.

    returns

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

    Attributes
    final
    Definition Classes
    Any
  3. def ## (): Int

    Equivalent to x.hashCode except for boxed numeric types.

    Equivalent to x.hashCode except for boxed numeric types. 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.

    returns

    a hash value consistent with ==

    Attributes
    final
    Definition Classes
    AnyRef → Any
  4. def + [B1 >: B] (elem1: (A, B1), elem2: (A, B1), elems: (A, B1)*): Map[A, B1]

    Adds two or more elements to this collection and returns a new collection.

    Adds two or more elements to this collection and returns a new collection.

    B1

    the type of the added values

    elem1

    the first element to add.

    elem2

    the second element to add.

    elems

    the remaining elements to add.

    returns

    A new map with the new bindings added to this map.

    Definition Classes
    MapLikeMapLike
  5. def ++ [B1 >: B] (xs: TraversableOnce[(A, B1)]): Map[A, B1]

    Definition Classes
    MapLikeMapLike
    Annotations
    @bridge()
  6. def ++ [B1 >: B] (xs: GenTraversableOnce[(A, B1)]): Map[A, B1]

    Adds a number of elements provided by a traversable object and returns a new collection with the added elements.

    Adds a number of elements provided by a traversable object and returns a new collection with the added elements.

    B1

    the type of the added values

    xs

    the traversable object consisting of key-value pairs.

    returns

    a new immutable map with the bindings of this map and those from xs.

    Definition Classes
    MapLikeMapLike
  7. def ++ [B >: (A, B), That] (that: TraversableOnce[B])(implicit bf: CanBuildFrom[This, B, That]): That

    Definition Classes
    TraversableLike
    Annotations
    @bridge()
  8. def ++ [B] (that: GenTraversableOnce[B]): immutable.Map[B]

    [use case] Concatenates this immutable map with the elements of a traversable collection.

    [use case]

    Concatenates this immutable map with the elements of a traversable collection.

    B

    the element type of the returned collection.

    that

    the traversable to append.

    returns

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

    Attributes
    abstract
    Definition Classes
    GenTraversableLike
  9. def ++ [B >: (A, B), That] (that: GenTraversableOnce[B])(implicit bf: CanBuildFrom[This, B, That]): That

    Concatenates this immutable map with the elements of a traversable collection.

    Concatenates this immutable map with the elements of a traversable collection.

    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 immutable map followed by all elements of that.

    Definition Classes
    TraversableLikeGenTraversableLike
  10. def ++: [B >: (A, B), That] (that: Traversable[B])(implicit bf: CanBuildFrom[This, B, That]): That

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

    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.

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

    [use case] Concatenates this immutable map with the elements of a traversable collection.

    [use case]

    Concatenates this immutable map with the elements of a traversable collection. It differs from ++ in that the right operand determines the type of the resulting collection rather than the left one.

    B

    the element type of the returned collection.

    that

    the traversable to append.

    returns

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

    Attributes
    abstract
    Definition Classes
    TraversableLike
  12. def ++: [B >: (A, B), That] (that: TraversableOnce[B])(implicit bf: CanBuildFrom[This, B, That]): That

    Concatenates this immutable map with the elements of a traversable collection.

    Concatenates this immutable map with the elements of a traversable collection. It differs from ++ in that the right operand determines the type of the resulting collection rather than the left one.

    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 immutable map followed by all elements of that.

    Definition Classes
    TraversableLike
  13. def - (elem1: A, elem2: A, elems: A*): This

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

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

    Definition Classes
    Subtractable
  14. 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

    Attributes
    abstract
    Definition Classes
    MapLike
  15. def -- (xs: TraversableOnce[A]): This

    Definition Classes
    Subtractable
    Annotations
    @bridge()
  16. def -- (xs: GenTraversableOnce[A]): This

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

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

    returns

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

    Definition Classes
    Subtractable
  17. def /: [B] (z: B)(op: (B, (A, B)) ⇒ B): B

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

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

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

    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 immutable map, going left to right with the start value z on the left:

                op(...op(op(z, x,,1,,), x,,2,,), ..., x,,n,,)
    

    where x,,1,,, ..., x,,n,, are the elements of this immutable map.

    Definition Classes
    TraversableOnceGenTraversableOnce
  18. 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.

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

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

    Applies a binary operator to all elements of this immutable 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.

    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 immutable map, going right to left with the start value z on the right:

                op(x,,1,,, op(x,,2,,, ... op(x,,n,,, z)...))
    

    where x,,1,,, ..., x,,n,, are the elements of this immutable map.

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

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

    Test two objects for equality.

    Test two objects for equality.

    returns

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

    Attributes
    final
    Definition Classes
    Any
  22. 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
  23. def addString (b: StringBuilder): StringBuilder

    Appends all elements of this immutable map to a string builder.

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

    b

    the string builder to which elements are appended.

    returns

    the string builder b to which elements were appended.

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

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

    Appends all elements of this immutable 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 immutable map, separated by the string sep.

    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
  25. 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 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).

    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
  26. 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
  27. 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
  28. 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.

    Attributes
    final
    Definition Classes
    Any
  29. 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 immutable map should be compared

    returns

    true, if this immutable 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
  30. def clone (): AnyRef

    Create a copy of the receiver object.

    Create a copy of the receiver object.

    The default implementation of the clone method is platform dependent.

    returns

    a copy of the receiver object.

    Attributes
    protected[lang]
    Definition Classes
    AnyRef
    Annotations
    @throws()
  31. def collect [B] (pf: PartialFunction[(A, B), B]): immutable.Map[B]

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

    [use case]

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

    B

    the element type of the returned collection.

    pf

    the partial function which filters and maps the immutable map.

    returns

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

    Attributes
    abstract
    Definition Classes
    GenTraversableLike
  32. def collect [B, That] (pf: PartialFunction[(A, B), B])(implicit bf: CanBuildFrom[This, B, That]): That

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

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

    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.

    pf

    the partial function which filters and maps the immutable map.

    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 resulting from applying the 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
  33. def collectFirst [B] (pf: PartialFunction[(A, B), B]): Option[B]

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

    Finds the first element of the immutable 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)

  34. 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
  35. def contains (key: A): Boolean

    Tests whether this map contains a binding for a key.

    Tests whether this map contains a binding for a key.

    key

    the key

    returns

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

    Definition Classes
    MapLike
  36. def copyToArray (xs: Array[(A, B)], start: Int, len: Int): Unit

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

    [use case]

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

    Attributes
    abstract
    Definition Classes
    TraversableLike
  37. def copyToArray [B >: (A, B)] (xs: Array[B], start: Int, len: Int): Unit

    Copies elements of this immutable map to an array.

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

    B

    the type of the elements of the array.

    xs

    the array to fill.

    start

    the starting index.

    len

    the maximal number of elements to copy.

    Definition Classes
    IterableLikeTraversableLikeTraversableOnceGenTraversableOnce
  38. def copyToArray (xs: Array[(A, B)]): Unit

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

    [use case]

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

    xs

    the array to fill.

    Attributes
    abstract
    Definition Classes
    GenTraversableOnce
  39. def copyToArray [B >: (A, B)] (xs: Array[B]): Unit

    Copies values of this immutable map to an array.

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

    B

    the type of the elements of the array.

    xs

    the array to fill.

    Definition Classes
    TraversableOnceGenTraversableOnce
  40. def copyToArray (xs: Array[(A, B)], start: Int): Unit

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

    [use case]

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

    xs

    the array to fill.

    start

    the starting index.

    Attributes
    abstract
    Definition Classes
    GenTraversableOnce
  41. def copyToArray [B >: (A, B)] (xs: Array[B], start: Int): Unit

    Copies values of this immutable map to an array.

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

    B

    the type of the elements of the array.

    xs

    the array to fill.

    start

    the starting index.

    Definition Classes
    TraversableOnceGenTraversableOnce
  42. def copyToBuffer [B >: (A, B)] (dest: Buffer[B]): Unit

    Copies all elements of this immutable map to a buffer.

    Copies all elements of this immutable map to a buffer.

    dest

    The buffer to which elements are copied.

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

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

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

    p

    the predicate used to test elements.

    returns

    the number of elements satisfying the predicate p.

    Definition Classes
    TraversableOnceGenTraversableOnce
  44. 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
  45. def drop (n: Int): This

    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 immutable map.

    returns

    a immutable map consisting of all elements of this immutable map except the first n ones, or else the empty immutable map, if this immutable map has less than n elements.

    Definition Classes
    IterableLikeTraversableLikeGenTraversableLike
  46. def dropRight (n: Int): This

    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 immutable map consisting of all elements of this immutable map except the last n ones, or else the empty immutable map, if this immutable map has less than n elements.

    Definition Classes
    IterableLike
  47. def dropWhile (p: ((A, B)) ⇒ Boolean): This

    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.

    p

    The predicate used to test elements.

    returns

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

    Definition Classes
    TraversableLikeGenTraversableLike
  48. 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.

    Attributes
    final
    Definition Classes
    AnyRef
  49. 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
  50. def exists (p: ((A, B)) ⇒ Boolean): Boolean

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

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

    p

    the predicate used to test elements.

    returns

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

    Definition Classes
    IterableLikeTraversableLikeTraversableOnceGenTraversableOnce
  51. def filter (p: ((A, B)) ⇒ Boolean): This

    Selects all elements of this immutable map which satisfy a predicate.

    Selects all elements of this immutable map which satisfy a predicate.

    p

    the predicate used to test elements.

    returns

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

    Definition Classes
    TraversableLikeGenTraversableLike
  52. 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
    MapLikeMapLike
  53. def filterNot (p: ((A, B)) ⇒ Boolean): This

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

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

    Note: This method works by successively removing elements fro which the predicate is false 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
  54. def finalize (): Unit

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

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

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

    Attributes
    protected[lang]
    Definition Classes
    AnyRef
    Annotations
    @throws()
  55. def find (p: ((A, B)) ⇒ Boolean): Option[(A, B)]

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

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

    Definition Classes
    IterableLikeTraversableLikeTraversableOnceGenTraversableOnce
  56. def flatMap [B] (f: ((A, B)) ⇒ GenTraversableOnce[B]): immutable.Map[B]

    [use case] Builds a new collection by applying a function to all elements of this immutable map and concatenating the results.

    [use case]

    Builds a new collection by applying a function to all elements of this immutable map and concatenating the results.

    B

    the element type of the returned collection.

    f

    the function to apply to each element.

    returns

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

    Attributes
    abstract
    Definition Classes
    GenTraversableLike
  57. def flatMap [B, That] (f: ((A, B)) ⇒ GenTraversableOnce[B])(implicit bf: CanBuildFrom[This, B, That]): That

    Builds a new collection by applying a function to all elements of this immutable map and concatenating the results.

    Builds a new collection by applying a function to all elements of this immutable map and concatenating the results.

    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.

    f

    the function to apply to each 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

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

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

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

    Folds the elements of this sequence using the specified associative binary operator. The order in which the elements are reduced is unspecified and may be nondeterministic.

    Note this method has a different signature than the foldLeft and foldRight methods of the trait Traversable. The result of folding may only be a supertype of this parallel collection's type parameter T.

    z

    a neutral element for the fold operation, it may be added to the result an arbitrary number of times, not changing 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
  59. def foldLeft [B] (z: B)(op: (B, (A, B)) ⇒ B): B

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

    Applies a binary operator to a start value and all elements of this immutable 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 immutable map, going left to right with the start value z on the left:

                op(...op(z, x,,1,,), x,,2,,, ..., x,,n,,)
    

    where x,,1,,, ..., x,,n,, are the elements of this immutable map.

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

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

    Applies a binary operator to all elements of this immutable 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 immutable map, going right to left with the start value z on the right:

                op(x,,1,,, op(x,,2,,, ... op(x,,n,,, z)...))
    

    where x,,1,,, ..., x,,n,, are the elements of this immutable map.

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

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

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

    p

    the predicate used to test elements.

    returns

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

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

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

    [use case]

    Applies a function f to all elements of this immutable map.

    f

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

    Attributes
    abstract
    Definition Classes
    IterableLike
  63. def foreach [U] (f: ((A, B)) ⇒ U): Unit

    Applies a function f to all elements of this immutable map.

    Applies a function f to all elements of this immutable map.

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

    U

    the type parameter describing the result of function f. This result will always be ignored. Typically U is Unit, but this is not necessary.

    f

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

    Definition Classes
    IterableLikeTraversableLikeGenTraversableLikeTraversableOnceGenTraversableOnceFilterMonadic
  64. def getClass (): java.lang.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.

    Attributes
    final
    Definition Classes
    AnyRef → Any
  65. def getOrElse (key: A, default: ⇒ B): B

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

    [use case]

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

    key

    the key.

    default

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

    returns

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

    Attributes
    abstract
    Definition Classes
    MapLike
  66. def getOrElse [B1 >: B] (key: A, default: ⇒ B1): B1

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

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

    B1

    the result type of the default computation.

    key

    the key.

    default

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

    returns

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

    Definition Classes
    MapLike
  67. def groupBy [K] (f: ((A, B)) ⇒ K): Map[K, This]

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

    Partitions this immutable map into a map of immutable 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 immutable map.

    K

    the type of keys returned by the discriminator function.

    f

    the discriminator function.

    returns

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

    Definition Classes
    TraversableLikeGenTraversableLike
  68. def grouped (size: Int): Iterator[This]

    Partitions elements in fixed size immutable maps.

    Partitions elements in fixed size immutable maps.

    size

    the number of elements per group

    returns

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

    Definition Classes
    IterableLike
    See also

    Iterator#grouped

  69. def hasDefiniteSize : Boolean

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

    Tests whether this immutable 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
  70. def hashCode (): Int

    The hashCode method for reference types.

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

    returns

    the hash code value for this object.

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

    Selects the first element of this immutable map.

    Selects the first element of this immutable map.

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

    returns

    the first element of this immutable map.

    Definition Classes
    IterableLikeGenIterableLikeTraversableLikeGenTraversableLike
  72. def headOption : Option[(A, B)]

    Optionally selects the first element.

    Optionally selects the first element.

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

    returns

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

    Definition Classes
    TraversableLike
  73. def init : This

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

    Definition Classes
    TraversableLike
  74. def inits : Iterator[This]

    Iterates over the inits of this immutable map.

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

    returns

    an iterator over all the inits of this immutable map

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

  75. def isDefinedAt (key: A): Boolean

    Tests whether this map contains a binding for a key.

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

    key

    the key

    returns

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

    Definition Classes
    MapLikePartialFunction
  76. def isEmpty : Boolean

    Tests whether the map is empty.

    Tests whether the map is empty.

    returns

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

    Definition Classes
    MapLikeIterableLikeGenIterableLikeTraversableLikeTraversableOnceGenTraversableOnce
  77. 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.

    Attributes
    final
    Definition Classes
    Any
  78. def isTraversableAgain : Boolean

    Tests whether this immutable map can be repeatedly traversed.

    Tests whether this immutable map can be repeatedly traversed.

    returns

    true

    Attributes
    final
    Definition Classes
    GenTraversableLikeGenTraversableOnce
  79. def keySet : Set[A]

    Collects all keys of this map in a set.

    Collects all keys of this map in a set.

    returns

    a set containing all keys of this map.

    Definition Classes
    MapLikeMapLike
  80. def keys : Iterable[A]

    Creates an iterator for all keys.

    Creates an iterator for all keys.

    returns

    an iterator over all keys.

    Definition Classes
    MapLike
    Annotations
    @migration
    Migration

    "As of 2.8, keys returns Iterable[A] rather than Iterator[A]."

  81. def keysIterator : Iterator[A]

    Creates an iterator for all keys.

    Creates an iterator for all keys.

    returns

    an iterator over all keys.

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

    Selects the last element.

    Selects the last element.

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

    returns

    The last element of this immutable map.

    Definition Classes
    TraversableLike
  83. def lastOption : Option[(A, B)]

    Optionally selects the last element.

    Optionally selects the last element.

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

    returns

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

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

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

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

    returns

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

    Definition Classes
    PartialFunction
    See also

    Function.unlift

  85. def map [B] (f: ((A, B)) ⇒ B): immutable.Map[B]

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

    [use case]

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

    B

    the element type of the returned collection.

    f

    the function to apply to each element.

    returns

    a new collection of type That resulting from applying the given function f to each element of this immutable map and collecting the results.

    Attributes
    abstract
    Definition Classes
    GenTraversableLike
  86. def map [B, That] (f: ((A, B)) ⇒ B)(implicit bf: CanBuildFrom[This, B, That]): That

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

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

    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.

    f

    the function to apply to each 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

    a new collection of type That resulting from applying the given function f to each element of this immutable map and collecting the results.

    Definition Classes
    TraversableLikeGenTraversableLikeFilterMonadic
  87. 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
    MapLikeMapLike
  88. def max : (A, B)

    [use case] Finds the largest element.

    [use case]

    Finds the largest element.

    returns

    the largest element of this immutable map with respect to the ordering cmp.

    Attributes
    abstract
    Definition Classes
    GenTraversableOnce
  89. def max [B >: (A, B)] (implicit cmp: Ordering[B]): (A, B)

    Finds the largest element.

    Finds the largest element.

    B

    The type over which the ordering is defined.

    cmp

    An ordering to be used for comparing elements.

    returns

    the largest element of this immutable map with respect to the ordering cmp.

    Definition Classes
    TraversableOnceGenTraversableOnce
  90. def maxBy [B] (f: ((A, B)) ⇒ B)(implicit cmp: Ordering[B]): (A, B)

    Definition Classes
    TraversableOnceGenTraversableOnce
  91. def min : (A, B)

    [use case] Finds the smallest element.

    [use case]

    Finds the smallest element.

    returns

    the smallest element of this immutable map with respect to the ordering cmp.

    Attributes
    abstract
    Definition Classes
    GenTraversableOnce
  92. def min [B >: (A, B)] (implicit cmp: Ordering[B]): (A, B)

    Finds the smallest element.

    Finds the smallest element.

    B

    The type over which the ordering is defined.

    cmp

    An ordering to be used for comparing elements.

    returns

    the smallest element of this immutable map with respect to the ordering cmp.

    Definition Classes
    TraversableOnceGenTraversableOnce
  93. def minBy [B] (f: ((A, B)) ⇒ B)(implicit cmp: Ordering[B]): (A, B)

    Definition Classes
    TraversableOnceGenTraversableOnce
  94. def mkString : String

    Displays all elements of this immutable map in a string.

    Displays all elements of this immutable map in a string.

    returns

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

    Definition Classes
    TraversableOnceGenTraversableOnce
  95. def mkString (sep: String): String

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

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

    sep

    the separator string.

    returns

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

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

  96. def mkString (start: String, sep: String, end: String): String

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

    Displays all elements of this immutable 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 immutable 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 immutable map are separated by the string sep.

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

  97. 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.

    Attributes
    final
    Definition Classes
    AnyRef
  98. def newBuilder : Builder[(A, B), This]

    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
  99. def nonEmpty : Boolean

    Tests whether the immutable map is not empty.

    Tests whether the immutable map is not empty.

    returns

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

    Definition Classes
    TraversableOnceGenTraversableOnce
  100. 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.

    Attributes
    final
    Definition Classes
    AnyRef
  101. 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.

    Attributes
    final
    Definition Classes
    AnyRef
  102. 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
  103. 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
  104. 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
    MapLikeMapLikeTraversableLikeParallelizable
  105. def partition (p: ((A, B)) ⇒ Boolean): (This, This)

    Partitions this immutable map in two immutable maps according to a predicate.

    Partitions this immutable map in two immutable maps according to a predicate.

    p

    the predicate on which to partition.

    returns

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

    Definition Classes
    TraversableLikeGenTraversableLike
  106. def product : (A, B)

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

    [use case]

    Multiplies up the elements of this collection.

    returns

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

    Attributes
    abstract
    Definition Classes
    GenTraversableOnce
  107. def product [B >: (A, B)] (implicit num: Numeric[B]): B

    Multiplies up the elements of this collection.

    Multiplies up the elements of this collection.

    B

    the result type of the * operator.

    num

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

    returns

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

    Definition Classes
    TraversableOnceGenTraversableOnce
  108. def reduce [A1 >: (A, B)] (op: (A1, A1) ⇒ A1): A1

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

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

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

    Note this method has a different signature than the reduceLeft and reduceRight methods of the trait Traversable. The result of reducing may only be a supertype of this parallel collection's type parameter T.

    op

    A binary operator that must be associative.

    returns

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

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

    Definition Classes
    TraversableOnce
  110. def reduceLeftOption [B >: (A, B)] (op: (B, (A, B)) ⇒ B): Option[B]

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

    Optionally applies a binary operator to all elements of this immutable 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 immutable map is nonempty, None otherwise.

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

    Optionally reduces the elements of this sequence using the specified associative binary operator.

    Optionally reduces the elements of this sequence using the specified associative binary operator.

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

    Note this method has a different signature than the reduceLeftOption and reduceRightOption methods of the trait Traversable. The result of reducing may only be a supertype of this parallel collection's type parameter T.

    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
  112. def reduceRight [B >: (A, B)] (op: ((A, B), B) ⇒ B): B

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

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

                op(x,,1,,, op(x,,2,,, ..., op(x,,n-1,,, x,,n,,)...))
    

    where x,,1,,, ..., x,,n,, are the elements of this immutable map.

    Definition Classes
    IterableLikeTraversableOnceGenTraversableOnce
  113. def reduceRightOption [B >: (A, B)] (op: ((A, B), B) ⇒ B): Option[B]

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

    Optionally applies a binary operator to all elements of this immutable 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 immutable map is nonempty, None otherwise.

    Definition Classes
    TraversableOnceGenTraversableOnce
  114. def repr : This

    The collection of type immutable map underlying this TraversableLike object.

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

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

    Attributes
    protected[this]
    Definition Classes
    TraversableOnce
  116. def sameElements [B >: (A, B)] (that: Iterable[B]): Boolean

    Definition Classes
    IterableLike
    Annotations
    @bridge()
  117. def sameElements (that: GenIterable[(A, B)]): Boolean

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

    [use case]

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

    that

    the collection to compare with.

    returns

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

    Attributes
    abstract
    Definition Classes
    GenIterableLike
  118. def sameElements [B >: (A, B)] (that: GenIterable[B]): Boolean

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

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

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

    B

    the type of the elements of collection that.

    that

    the collection to compare with.

    returns

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

    Definition Classes
    IterableLikeGenIterableLike
  119. def scan [B >: (A, B), That] (z: B)(op: (B, B) ⇒ B)(implicit cbf: CanBuildFrom[This, 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 immutable map containing the prefix scan of the elements in this immutable map

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

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

    Produces a collection containing cummulative 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[This, B, That]): That

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

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

    "This scanRight definition has changed in 2.9.\n" + "The previous behavior can be reproduced with scanRight.reverse."

  122. def size : Int

    The size of this immutable map.

    The size of this immutable map.

    returns

    the number of elements in this immutable map.

    Definition Classes
    TraversableOnceGenTraversableOnce
  123. def slice (from: Int, until: Int): This

    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.

    from

    the lowest index to include from this immutable map.

    until

    the highest index to EXCLUDE from this immutable map.

    returns

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

    Definition Classes
    IterableLikeTraversableLikeGenTraversableLike
  124. def sliding [B >: (A, B)] (size: Int, step: Int): Iterator[This]

    Definition Classes
    IterableLike
  125. def sliding [B >: (A, B)] (size: Int): Iterator[This]

    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 immutable 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

    Iterator#sliding

  126. def span (p: ((A, B)) ⇒ Boolean): (This, This)

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

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

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

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

    p

    the test predicate

    returns

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

    Definition Classes
    TraversableLikeGenTraversableLike
  127. def splitAt (n: Int): (This, This)

    Splits this immutable map into two at a given position.

    Splits this immutable 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 immutable maps consisting of the first n elements of this immutable map, and the other elements.

    Definition Classes
    TraversableLikeGenTraversableLike
  128. 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 immutable map. Unless overridden in subclasses, the string prefix of every map is "Map".

    Definition Classes
    MapLikeTraversableLikeGenTraversableLike
  129. def sum : (A, B)

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

    [use case]

    Sums up the elements of this collection.

    returns

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

    Attributes
    abstract
    Definition Classes
    GenTraversableOnce
  130. def sum [B >: (A, B)] (implicit num: Numeric[B]): B

    Sums up the elements of this collection.

    Sums up the elements of this collection.

    B

    the result type of the + operator.

    num

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

    returns

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

    Definition Classes
    TraversableOnceGenTraversableOnce
  131. def synchronized [T0] (arg0: ⇒ T0): T0

    Attributes
    final
    Definition Classes
    AnyRef
  132. def tail : This

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

    Definition Classes
    TraversableLikeGenTraversableLike
  133. def tails : Iterator[This]

    Iterates over the tails of this immutable map.

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

    returns

    an iterator over all the tails of this immutable 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): This

    Selects first n elements.

    Selects first n elements.

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

    n

    Tt number of elements to take from this immutable map.

    returns

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

    Definition Classes
    IterableLikeTraversableLikeGenTraversableLike
  135. def takeRight (n: Int): This

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

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

    Takes longest prefix of elements that satisfy a predicate.

    Takes longest prefix of elements that satisfy a predicate.

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

    p

    The predicate used to test elements.

    returns

    the longest prefix of this immutable 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 immutable.Map.

    The underlying collection seen as an instance of immutable.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 toArray : Array[(A, B)]

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

    [use case]

    Converts this immutable map to an array.

    returns

    an array containing all elements of this immutable map.

    Attributes
    abstract
    Definition Classes
    GenTraversableOnce
  139. def toArray [B >: (A, B)] (implicit arg0: ClassManifest[B]): Array[B]

    Converts this immutable map to an array.

    Converts this immutable map to an array.

    B

    the type of the elements of the array. A ClassManifest for this type must be available.

    returns

    an array containing all elements of this immutable map.

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

    Converts this immutable map to a mutable buffer.

    Converts this immutable map to a mutable buffer.

    returns

    a buffer containing all elements of this immutable map.

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

    A conversion from collections of type Repr to immutable.Map objects.

    A conversion from collections of type Repr to immutable.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 [B >: (A, B)] : IndexedSeq[B]

    Converts this immutable map to an indexed sequence.

    Converts this immutable map to an indexed sequence.

    returns

    an indexed sequence containing all elements of this immutable map.

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

    Converts this immutable map to an iterable collection.

    Converts this immutable 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 immutable map.

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

    Returns an Iterator over the elements in this immutable map.

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

    returns

    an Iterator containing all elements of this immutable map.

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

    Converts this immutable map to a list.

    Converts this immutable map to a list.

    returns

    a list containing all elements of this immutable map.

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

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

    [use case]

    Converts this immutable 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 containing all elements of this immutable map.

    Attributes
    abstract
    Definition Classes
    GenTraversableOnce
  147. def toMap [T, U] (implicit ev: <:<[(A, B), (T, U)]): Map[T, U]

    Converts this immutable map to a map.

    Converts this immutable 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 containing all elements of this immutable map.

    Definition Classes
    TraversableOnceGenTraversableOnce
  148. def toSeq : Seq[(A, B)]

    Overridden for efficiency.

    Overridden for efficiency.

    returns

    a sequence containing all elements of this immutable map.

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

    Converts this immutable map to a set.

    Converts this immutable map to a set.

    returns

    a set containing all elements of this immutable map.

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

    Converts this immutable map to a stream.

    Converts this immutable map to a stream.

    returns

    a stream containing all elements of this immutable map.

    Definition Classes
    IterableLikeTraversableLikeGenTraversableOnce
  151. def toString (): String

    Converts this immutable map to a string.

    Converts this immutable map to a string.

    returns

    a string representation of this collection. By default this string consists of the stringPrefix of this immutable 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 immutable map to an unspecified Traversable.

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

    returns

    a Traversable containing all elements of this immutable map.

    Definition Classes
    TraversableLikeTraversableOnceGenTraversableOnce
  153. def transform [C, That] (f: (A, B) ⇒ C)(implicit bf: CanBuildFrom[This, (A, C), That]): That

    This function transforms all the values of mappings contained in this map with function f.

    This function transforms all the values of mappings contained in this map with function f.

    f

    A function over keys and values

    returns

    the updated map

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

    A new immutable map containing updating this map with a given key/value mapping.

    A new immutable map containing updating this map with a given key/value mapping.

    B1

    the type of the added value

    key

    the key

    value

    the value

    returns

    A new map with the new key/value mapping

    Definition Classes
    MapLikeMapLike
  155. def values : Iterable[B]

    Collects all values of this map in an iterable collection.

    Collects all values of this map in an iterable collection.

    returns

    the values of this map as an iterable.

    Definition Classes
    MapLike
    Annotations
    @migration
    Migration

    "As of 2.8, values returns Iterable[B] rather than Iterator[B]."

  156. def valuesIterator : Iterator[B]

    Creates an iterator for all values in this map.

    Creates an iterator for all values in this map.

    returns

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

    Definition Classes
    MapLike
  157. def view (from: Int, until: Int): IterableView[(A, B), This]

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

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

    Note: the difference between view and slice is that view produces a view of the current immutable map, whereas slice produces a new immutable 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 immutable map, starting at index from and extending up to (but not including) index until.

    Definition Classes
    IterableLikeTraversableLike
  158. def view : IterableView[(A, B), This]

    Creates a non-strict view of this immutable map.

    Creates a non-strict view of this immutable map.

    returns

    a non-strict view of this immutable map.

    Definition Classes
    IterableLikeTraversableLike
  159. def wait (): Unit

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

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

    Attributes
    final
    Definition Classes
    AnyRef
    Annotations
    @throws()
  162. def withFilter (p: ((A, B)) ⇒ Boolean): FilterMonadic[(A, B), This]

    Creates a non-strict filter of this immutable map.

    Creates a non-strict filter of this immutable 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 immutable map which satisfy the predicate p.

    Definition Classes
    TraversableLikeFilterMonadic
  163. def zip [A1 >: (A, B), B, That] (that: Iterable[B])(implicit bf: CanBuildFrom[This, (A1, B), That]): That

    Definition Classes
    IterableLike
    Annotations
    @bridge()
  164. def zip [B] (that: GenIterable[B]): immutable.Map[((A, B), B)]

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

    [use case]

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

    B

    the type of the second half of the returned pairs

    that

    The iterable providing the second half of each result pair

    returns

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

    Attributes
    abstract
    Definition Classes
    GenIterableLike
  165. def zip [A1 >: (A, B), B, That] (that: GenIterable[B])(implicit bf: CanBuildFrom[This, (A1, B), That]): That

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

    Returns a immutable map formed from this immutable 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.

    A1

    the type of the first half of the returned pairs (this is always a supertype of the collection's element type A).

    B

    the type of the second half of the returned pairs

    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 (A1, B) being admissible for that class, which means that an implicit instance of type CanBuildFrom[Repr, (A1, B), That]. is found.

    that

    The iterable providing the second half of each result pair

    bf

    an implicit value of class CanBuildFrom which determines the result class That from the current representation type Repr and the new element type (A1, B).

    returns

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

    Definition Classes
    IterableLikeGenIterableLike
  166. def zipAll [B, A1 >: (A, B), That] (that: Iterable[B], thisElem: A1, thatElem: B)(implicit bf: CanBuildFrom[This, (A1, B), That]): That

    Definition Classes
    IterableLike
    Annotations
    @bridge()
  167. def zipAll [B] (that: Iterable[B], thisElem: (A, B), thatElem: B): immutable.Map[((A, B), B)]

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

    [use case]

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

    that

    the iterable providing the second half of each result pair

    thisElem

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

    thatElem

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

    returns

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

    Attributes
    abstract
    Definition Classes
    GenIterableLike
  168. def zipAll [B, A1 >: (A, B), That] (that: GenIterable[B], thisElem: A1, thatElem: B)(implicit bf: CanBuildFrom[This, (A1, B), That]): That

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

    Returns a immutable map formed from this immutable 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.

    that

    the iterable providing the second half of each result pair

    thisElem

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

    thatElem

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

    returns

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

    Definition Classes
    IterableLikeGenIterableLike
  169. def zipWithIndex : immutable.Map[((A, B), Int)]

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

    [use case]

    Zips this immutable map with its indices.

    returns

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

    Attributes
    abstract
    Definition Classes
    GenIterableLike
  170. def zipWithIndex [A1 >: (A, B), That] (implicit bf: CanBuildFrom[This, (A1, Int), That]): That

    Zips this immutable map with its indices.

    Zips this immutable map with its indices.

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

    A1

    the type of the first half of the returned pairs (this is always a supertype of the collection's element type A).

    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 (A1, Int) being admissible for that class, which means that an implicit instance of type CanBuildFrom[Repr, (A1, Int), That]. is found.

    returns

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

    Definition Classes
    IterableLikeGenIterableLike

Deprecated Value Members

  1. def elements : Iterator[(A, B)]

    Definition Classes
    IterableLike
    Annotations
    @deprecated
    Deprecated

    use iterator' instead

  2. def first : (A, B)

    Definition Classes
    IterableLike
    Annotations
    @deprecated
    Deprecated

    use head' instead

  3. def firstOption : Option[(A, B)]

    None if iterable is empty.

    None if iterable is empty.

    Definition Classes
    IterableLike
    Annotations
    @deprecated
    Deprecated

    use headOption' instead

  4. def mapElements [C] (f: (B) ⇒ C): Map[A, C]

    Definition Classes
    MapLike
    Annotations
    @deprecated
    Deprecated

    use mapValues' instead

  5. def projection : IterableView[(A, B), This]

    returns a projection that can be used to call non-strict filter, map, and flatMap methods that build projections of the collection.

    returns a projection that can be used to call non-strict filter, map, and flatMap methods that build projections of the collection.

    Definition Classes
    IterableLike
    Annotations
    @deprecated
    Deprecated

    use view' instead

Inherited from MapLike[A, B, This]

Inherited from Subtractable[A, This]

Inherited from GenMapLike[A, B, This]

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

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

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

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

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

Inherited from TraversableOnce[(A, B)]

Inherited from GenTraversableOnce[(A, B)]

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

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

Inherited from Equals

Inherited from PartialFunction[A, B]

Inherited from (A) ⇒ B

Inherited from AnyRef

Inherited from Any