Packages

trait MapOps[K, +V, +CC[_, _] <: IterableOps[_, AnyConstr, _], +C] extends IterableOps[(K, V), Iterable, C] with PartialFunction[K, V]

Base Map implementation type

K

Type of keys

V

Type of values

CC

type constructor of the map (e.g. HashMap). Operations returning a collection with a different type of entries (L, W) (e.g. map) return a CC[L, W].

C

type of the map (e.g. HashMap[Int, String]). Operations returning a collection with the same type of element (e.g. drop, filter) return a C.

Source
Map.scala
Linear Supertypes
PartialFunction[K, V], (K) => V, IterableOps[(K, V), Iterable, C], IterableOnceOps[(K, V), Iterable, C], IterableOnce[(K, V)], AnyRef, Any
Type Hierarchy
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Inherited
  1. MapOps
  2. PartialFunction
  3. Function1
  4. IterableOps
  5. IterableOnceOps
  6. IterableOnce
  7. AnyRef
  8. Any
Implicitly
  1. by UnliftOps
  2. by iterableOnceExtensionMethods
  3. by any2stringadd
  4. by StringFormat
  5. by Ensuring
  6. by ArrowAssoc
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Visibility
  1. Public
  2. Protected

Type Members

  1. trait GenKeySet extends AnyRef

    A generic trait that is reused by keyset implementations

    A generic trait that is reused by keyset implementations

    Attributes
    protected
  2. class KeySet extends AbstractSet[K] with GenKeySet with DefaultSerializable

    The implementation class of the set returned by keySet.

    The implementation class of the set returned by keySet.

    Attributes
    protected

Abstract Value Members

  1. abstract def coll: C

    returns

    This collection as a C.

    Attributes
    protected
    Definition Classes
    IterableOps
  2. abstract def fromSpecific(coll: IterableOnce[(K, V)]): C

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

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

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

    Attributes
    protected
    Definition Classes
    IterableOps
    Note

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

    ,

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

  3. abstract def get(key: K): Option[V]

    Optionally returns the value associated with a key.

    Optionally returns the value associated with a key.

    key

    the key value

    returns

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

  4. abstract def iterableFactory: IterableFactory[Iterable]

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

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

    Definition Classes
    IterableOps
    Note

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

  5. abstract def iterator: Iterator[(K, V)]

    Iterator can be used only once

    Iterator can be used only once

    Definition Classes
    IterableOnce
  6. abstract def mapFactory: MapFactory[CC]

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

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

    Note

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

  7. abstract def newSpecificBuilder: Builder[(K, V), C]

    returns

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

    Attributes
    protected
    Definition Classes
    IterableOps
    Note

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

    ,

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

  8. abstract def toIterable: Iterable[(K, V)]

    returns

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

    Definition Classes
    IterableOps
    Annotations
    @deprecated
    Deprecated

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

Concrete Value Members

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

    Test two objects for inequality.

    Test two objects for inequality.

    returns

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

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

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

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

    returns

    a hash value consistent with ==

    Definition Classes
    AnyRef → Any
  3. def ++[V2 >: V](xs: IterableOnce[(K, V2)]): CC[K, V2]

    Alias for concat

  4. final def ++[B >: (K, V)](suffix: IterableOnce[B]): Iterable[B]

    Alias for concat

    Alias for concat

    Definition Classes
    IterableOps
    Annotations
    @inline()
  5. def ->[B](y: B): (MapOps[K, V, CC, C], B)
    Implicit
    This member is added by an implicit conversion from MapOps[K, V, CC, C] toArrowAssoc[MapOps[K, V, CC, C]] performed by method ArrowAssoc in scala.Predef.This conversion will take place only if V is a subclass of Option[Nothing] (V <: Option[Nothing]).
    Definition Classes
    ArrowAssoc
    Annotations
    @inline()
  6. final def ==(arg0: Any): Boolean

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

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

    returns

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

    Definition Classes
    AnyRef → Any
  7. def addString(sb: mutable.StringBuilder, start: String, sep: String, end: String): mutable.StringBuilder

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

    Appends all elements of this map to a string builder using start, end, and separator strings. The written text begins with the string start and ends with the string end. Inside, the string representations (w.r.t. the method toString) of all elements of this map are separated by the string sep.

    Example:

    scala> val a = List(1,2,3,4)
    a: List[Int] = List(1, 2, 3, 4)
    
    scala> val b = new StringBuilder()
    b: StringBuilder =
    
    scala> a.addString(b , "List(" , ", " , ")")
    res5: StringBuilder = List(1, 2, 3, 4)
    start

    the starting string.

    sep

    the separator string.

    end

    the ending string.

    returns

    the string builder b to which elements were appended.

    Definition Classes
    MapOpsIterableOnceOps
  8. final def addString(b: mutable.StringBuilder): mutable.StringBuilder

    Appends all elements of this map to a string builder.

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

    Example:

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

    the string builder to which elements are appended.

    returns

    the string builder b to which elements were appended.

    Definition Classes
    IterableOnceOps
    Annotations
    @inline()
  9. final def addString(b: mutable.StringBuilder, sep: String): mutable.StringBuilder

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

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

    Example:

    scala> val a = List(1,2,3,4)
    a: List[Int] = List(1, 2, 3, 4)
    
    scala> val b = new StringBuilder()
    b: StringBuilder =
    
    scala> a.addString(b, ", ")
    res0: StringBuilder = 1, 2, 3, 4
    b

    the string builder to which elements are appended.

    sep

    the separator string.

    returns

    the string builder b to which elements were appended.

    Definition Classes
    IterableOnceOps
    Annotations
    @inline()
  10. def andThen[C](k: PartialFunction[V, C]): PartialFunction[K, C]

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

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

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

    C

    the result type of the transformation function.

    k

    the transformation function

    returns

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

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

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

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

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

    C

    the result type of the transformation function.

    k

    the transformation function

    returns

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

    Definition Classes
    PartialFunctionFunction1
  12. def apply(key: K): V

    Retrieves the value which is associated with the given key.

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

    key

    the key

    returns

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

    Definition Classes
    MapOpsFunction1
    Annotations
    @throws(cause = scala.this.throws.<init>$default$1[NoSuchElementException])
  13. def applyOrElse[K1 <: K, V1 >: V](x: K1, default: (K1) => V1): V1

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

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

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

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

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

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

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

    x

    the function argument

    default

    the fallback function

    returns

    the result of this function or fallback function application.

    Definition Classes
    MapOpsPartialFunction
  14. final def asInstanceOf[T0]: T0

    Cast the receiver object to be of type T0.

    Cast the receiver object to be of type T0.

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

    returns

    the receiver object.

    Definition Classes
    Any
    Exceptions thrown

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

  15. def clone(): AnyRef

    Create a copy of the receiver object.

    Create a copy of the receiver object.

    The default implementation of the clone method is platform dependent.

    returns

    a copy of the receiver object.

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

    not specified by SLS as a member of AnyRef

  16. def collect[K2, V2](pf: PartialFunction[(K, V), (K2, V2)]): CC[K2, V2]

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

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

    K2

    the key type of the returned map.

    V2

    the value type of the returned map.

    pf

    the partial function which filters and maps the map.

    returns

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

  17. def collect[B](pf: PartialFunction[(K, V), B]): Iterable[B]

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

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

    B

    the element type of the returned map.

    pf

    the partial function which filters and maps the map.

    returns

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

    Definition Classes
    IterableOpsIterableOnceOps
  18. def collectFirst[B](pf: PartialFunction[(K, V), B]): Option[B]

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

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

    Note: may not terminate for infinite-sized collections.

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

    pf

    the partial function

    returns

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

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

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

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

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

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

    R

    the parameter type of the transformation function.

    k

    the transformation function

    returns

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

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

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

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

    A

    the type to which function g can be applied

    g

    a function A => T1

    returns

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

    Definition Classes
    Function1
    Annotations
    @unspecialized()
  21. def concat[V2 >: V](suffix: IterableOnce[(K, V2)]): CC[K, V2]

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

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

    suffix

    the traversable to append.

    returns

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

  22. def concat[B >: (K, V)](suffix: IterableOnce[B]): Iterable[B]

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

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

    B

    the element type of the returned collection.

    suffix

    the traversable to append.

    returns

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

    Definition Classes
    IterableOps
  23. def contains(key: K): Boolean

    Tests whether this map contains a binding for a key.

    Tests whether this map contains a binding for a key.

    key

    the key

    returns

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

  24. def copyToArray[B >: (K, V)](xs: Array[B], start: Int, len: Int): Int

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

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

    Fills the given array xs starting at index start with at most len elements of this map.

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

    B

    the type of the elements of the array.

    xs

    the array to fill.

    start

    the starting index of xs.

    len

    the maximal number of elements to copy.

    returns

    the number of elements written to the array

    Definition Classes
    IterableOnceOps
    Note

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

  25. def copyToArray[B >: (K, V)](xs: Array[B], start: Int): Int

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

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

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

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

    B

    the type of the elements of the array.

    xs

    the array to fill.

    start

    the starting index of xs.

    returns

    the number of elements written to the array

    Definition Classes
    IterableOnceOps
    Annotations
    @deprecatedOverriding()
    Note

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

  26. def copyToArray[B >: (K, V)](xs: Array[B]): Int

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

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

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

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

    B

    the type of the elements of the array.

    xs

    the array to fill.

    returns

    the number of elements written to the array

    Definition Classes
    IterableOnceOps
    Annotations
    @deprecatedOverriding()
    Note

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

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

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

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

    Note: will not terminate for infinite-sized collections.

    B

    the type of the elements of that

    that

    the other collection

    p

    the test predicate, which relates elements from both collections

    returns

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

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

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

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

    Note: will not terminate for infinite-sized collections.

    p

    the predicate used to test elements.

    returns

    the number of elements satisfying the predicate p.

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

    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.

    Annotations
    @throws(cause = scala.this.throws.<init>$default$1[NoSuchElementException])
    Exceptions thrown
  30. def drop(n: Int): C

    Selects all elements except first n ones.

    Selects all elements except first n ones.

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

    n

    the number of elements to drop from this map.

    returns

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

    Definition Classes
    IterableOpsIterableOnceOps
  31. def dropRight(n: Int): C

    Selects all elements except last n ones.

    Selects all elements except last n ones.

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

    n

    the number of elements to drop from this map.

    returns

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

    Definition Classes
    IterableOps
  32. def dropWhile(p: ((K, V)) => Boolean): C

    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 map whose first element does not satisfy the predicate p.

    Definition Classes
    IterableOpsIterableOnceOps
  33. def elementWise: ElementWiseExtractor[K, V]

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

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

    Definition Classes
    PartialFunction
    Example:
    1. val firstChar: String => Option[Char] = _.headOption
      
      Seq("foo", "bar", "baz") match {
        case firstChar.unlift.elementWise(c0, c1, c2) =>
          println(s"$c0, $c1, $c2") // Output: f, b, b
      }
  34. def empty: C

    The empty iterable of the same type as this iterable

    The empty iterable of the same type as this iterable

    returns

    an empty iterable of type C.

    Definition Classes
    IterableOps
  35. def ensuring(cond: (MapOps[K, V, CC, C]) => Boolean, msg: => Any): MapOps[K, V, CC, C]
    Implicit
    This member is added by an implicit conversion from MapOps[K, V, CC, C] toEnsuring[MapOps[K, V, CC, C]] performed by method Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  36. def ensuring(cond: (MapOps[K, V, CC, C]) => Boolean): MapOps[K, V, CC, C]
    Implicit
    This member is added by an implicit conversion from MapOps[K, V, CC, C] toEnsuring[MapOps[K, V, CC, C]] performed by method Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  37. def ensuring(cond: Boolean, msg: => Any): MapOps[K, V, CC, C]
    Implicit
    This member is added by an implicit conversion from MapOps[K, V, CC, C] toEnsuring[MapOps[K, V, CC, C]] performed by method Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  38. def ensuring(cond: Boolean): MapOps[K, V, CC, C]
    Implicit
    This member is added by an implicit conversion from MapOps[K, V, CC, C] toEnsuring[MapOps[K, V, CC, C]] performed by method Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  39. final def eq(arg0: AnyRef): Boolean

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

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

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

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

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

    returns

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

    Definition Classes
    AnyRef
  40. def equals(arg0: AnyRef): Boolean

    The equality method for reference types.

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

    See also equals in scala.Any.

    returns

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

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

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

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

    Note: may not terminate for infinite-sized collections.

    p

    the predicate used to test elements.

    returns

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

    Definition Classes
    IterableOnceOps
  42. def filter(pred: ((K, V)) => Boolean): C

    Selects all elements of this map which satisfy a predicate.

    Selects all elements of this map which satisfy a predicate.

    returns

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

    Definition Classes
    IterableOpsIterableOnceOps
  43. def filterNot(pred: ((K, V)) => Boolean): C

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

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

    pred

    the predicate used to test elements.

    returns

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

    Definition Classes
    IterableOpsIterableOnceOps
  44. def finalize(): Unit

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

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

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

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

    not specified by SLS as a member of AnyRef

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

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

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

    Note: may not terminate for infinite-sized collections.

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

    p

    the predicate used to test elements.

    returns

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

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

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

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

    f

    the function to apply to each element.

    returns

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

  47. def flatMap[B](f: ((K, V)) => IterableOnce[B]): Iterable[B]

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

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

    For example:

    def getWords(lines: Seq[String]): Seq[String] = lines flatMap (line => line split "\\W+")

    The type of the resulting collection is guided by the static type of map. This might cause unexpected results sometimes. For example:

    // lettersOf will return a Seq[Char] of likely repeated letters, instead of a Set
    def lettersOf(words: Seq[String]) = words flatMap (word => word.toSet)
    
    // lettersOf will return a Set[Char], not a Seq
    def lettersOf(words: Seq[String]) = words.toSet flatMap ((word: String) => word.toSeq)
    
    // xs will be an Iterable[Int]
    val xs = Map("a" -> List(11,111), "b" -> List(22,222)).flatMap(_._2)
    
    // ys will be a Map[Int, Int]
    val ys = Map("a" -> List(1 -> 11,1 -> 111), "b" -> List(2 -> 22,2 -> 222)).flatMap(_._2)
    B

    the element type of the returned collection.

    f

    the function to apply to each element.

    returns

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

    Definition Classes
    IterableOpsIterableOnceOps
  48. def flatten[B](implicit asIterable: ((K, V)) => IterableOnce[B]): Iterable[B]

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

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

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

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

    the type of the elements of each traversable collection.

    asIterable

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

    returns

    a new map resulting from concatenating all element maps.

    Definition Classes
    IterableOpsIterableOnceOps
  49. def fold[A1 >: (K, V)](z: A1)(op: (A1, A1) => A1): A1

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

    Folds the elements of this map using the specified associative binary operator. The default implementation in IterableOnce is equivalent to foldLeft but may be overridden for more efficient traversal orders.

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

    Note: will not terminate for infinite-sized collections.

    A1

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

    z

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

    op

    a binary operator that must be associative.

    returns

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

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

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

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

    Note: will not terminate for infinite-sized collections.

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

    B

    the result type of the binary operator.

    z

    the start value.

    op

    the binary operator.

    returns

    the result of inserting op between consecutive elements of this map, going left to right with the start value z on the left: op(...op(z, x1), x2, ..., xn) where x1, ..., xn are the elements of this map. Returns z if this map is empty.

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

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

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

    Note: will not terminate for infinite-sized collections.

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

    B

    the result type of the binary operator.

    z

    the start value.

    op

    the binary operator.

    returns

    the result of inserting op between consecutive elements of this map, going right to left with the start value z on the right: op(x1, op(x2, ... op(xn, z)...)) where x1, ..., xn are the elements of this map. Returns z if this map is empty.

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

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

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

    Note: may not terminate for infinite-sized collections.

    p

    the predicate used to test elements.

    returns

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

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

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

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

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

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

  55. final def getClass(): Class[_ <: AnyRef]

    Returns the runtime class representation of the object.

    Returns the runtime class representation of the object.

    returns

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

    Definition Classes
    AnyRef → Any
    Annotations
    @native()
  56. def getOrElse[V1 >: V](key: K, default: => V1): V1

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

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

    V1

    the result type of the default computation.

    key

    the key.

    default

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

    returns

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

  57. def groupBy[K](f: ((K, V)) => K): immutable.Map[K, C]

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

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

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

    K

    the type of keys returned by the discriminator function.

    f

    the discriminator function.

    returns

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

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

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

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

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

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

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

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

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

    K

    the type of keys returned by the discriminator function

    B

    the type of values returned by the transformation function

    key

    the discriminator function

    f

    the element transformation function

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

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

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

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

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

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

    Definition Classes
    IterableOps
  60. def grouped(size: Int): Iterator[C]

    Partitions elements in fixed size maps.

    Partitions elements in fixed size maps.

    size

    the number of elements per group

    returns

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

    Definition Classes
    IterableOps
    See also

    scala.collection.Iterator, method grouped

  61. def hashCode(): Int

    The hashCode method for reference types.

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

    returns

    the hash code value for this object.

    Definition Classes
    AnyRef → Any
    Annotations
    @native()
  62. def head: (K, V)

    Selects the first element of this map.

    Selects the first element of this map.

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

    returns

    the first element of this map.

    Definition Classes
    IterableOps
    Exceptions thrown

    NoSuchElementException if the map is empty.

  63. def headOption: Option[(K, V)]

    Optionally selects the first element.

    Optionally selects the first element.

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

    returns

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

    Definition Classes
    IterableOps
  64. def init: C

    The initial part of the collection without its last element.

    The initial part of the collection without its last element.

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

    Definition Classes
    IterableOps
  65. def inits: Iterator[C]

    Iterates over the inits of this map.

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

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

    returns

    an iterator over all the inits of this map

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

  66. def isDefinedAt(key: K): Boolean

    Tests whether this map contains a binding for a key.

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

    key

    the key

    returns

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

    Definition Classes
    MapOpsPartialFunction
  67. def isEmpty: Boolean

    Tests whether the map is empty.

    Tests whether the map is empty.

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

    returns

    true if the map contains no elements, false otherwise.

    Definition Classes
    IterableOnceOps
  68. final def isInstanceOf[T0]: Boolean

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

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

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

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

    This is exactly equivalent to the type pattern _: T0

    returns

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

    Definition Classes
    Any
    Note

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

  69. def isTraversableAgain: Boolean

    Tests whether this map can be repeatedly traversed.

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

    returns

    true if it is repeatedly traversable, false otherwise.

    Definition Classes
    IterableOpsIterableOnceOps
  70. def keySet: Set[K]

    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.

  71. def keyStepper[S <: Stepper[_]](implicit shape: StepperShape[K, S]): S

    Returns a Stepper for the keys of this map.

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

  72. def keys: Iterable[K]

    Collects all keys of this map in an iterable collection.

    Collects all keys of this map in an iterable collection.

    returns

    the keys of this map as an iterable.

  73. def keysIterator: Iterator[K]

    Creates an iterator for all keys.

    Creates an iterator for all keys.

    returns

    an iterator over all keys.

  74. def knownSize: Int

    returns

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

    Definition Classes
    IterableOnce
  75. def last: (K, V)

    Selects the last element.

    Selects the last element.

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

    returns

    The last element of this map.

    Definition Classes
    IterableOps
    Exceptions thrown

    NoSuchElementException If the map is empty.

  76. def lastOption: Option[(K, V)]

    Optionally selects the last element.

    Optionally selects the last element.

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

    returns

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

    Definition Classes
    IterableOps
  77. def lift: (K) => Option[V]

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

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

    returns

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

    Definition Classes
    PartialFunction
    See also

    Function.unlift

  78. def map[K2, V2](f: ((K, V)) => (K2, V2)): CC[K2, V2]

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

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

    f

    the function to apply to each element.

    returns

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

  79. def map[B](f: ((K, V)) => B): Iterable[B]

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

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

    B

    the element type of the returned map.

    f

    the function to apply to each element.

    returns

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

    Definition Classes
    IterableOpsIterableOnceOps
  80. final def mapFromIterable[K2, V2](it: Iterable[(K2, V2)]): CC[K2, V2]

    Similar to fromIterable, but returns a Map collection type.

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

    Attributes
    protected
    Annotations
    @inline()
  81. def max[B >: (K, V)](implicit ord: math.Ordering[B]): (K, V)

    Finds the largest element.

    Finds the largest element.

    Note: will not terminate for infinite-sized collections.

    B

    The type over which the ordering is defined.

    ord

    An ordering to be used for comparing elements.

    returns

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

    Definition Classes
    IterableOnceOps
    Exceptions thrown

    UnsupportedOperationException if this map is empty.

  82. def maxBy[B](f: ((K, V)) => B)(implicit cmp: math.Ordering[B]): (K, V)

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

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

    Note: will not terminate for infinite-sized collections.

    B

    The result type of the function f.

    f

    The measuring function.

    cmp

    An ordering to be used for comparing elements.

    returns

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

    Definition Classes
    IterableOnceOps
    Exceptions thrown

    UnsupportedOperationException if this map is empty.

  83. def maxByOption[B](f: ((K, V)) => B)(implicit cmp: math.Ordering[B]): Option[(K, V)]

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

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

    Note: will not terminate for infinite-sized collections.

    B

    The result type of the function f.

    f

    The measuring function.

    cmp

    An ordering to be used for comparing elements.

    returns

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

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

    Finds the largest element.

    Finds the largest element.

    Note: will not terminate for infinite-sized collections.

    B

    The type over which the ordering is defined.

    ord

    An ordering to be used for comparing elements.

    returns

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

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

    Finds the smallest element.

    Finds the smallest element.

    Note: will not terminate for infinite-sized collections.

    B

    The type over which the ordering is defined.

    ord

    An ordering to be used for comparing elements.

    returns

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

    Definition Classes
    IterableOnceOps
    Exceptions thrown

    UnsupportedOperationException if this map is empty.

  86. def minBy[B](f: ((K, V)) => B)(implicit cmp: math.Ordering[B]): (K, V)

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

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

    Note: will not terminate for infinite-sized collections.

    B

    The result type of the function f.

    f

    The measuring function.

    cmp

    An ordering to be used for comparing elements.

    returns

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

    Definition Classes
    IterableOnceOps
    Exceptions thrown

    UnsupportedOperationException if this map is empty.

  87. def minByOption[B](f: ((K, V)) => B)(implicit cmp: math.Ordering[B]): Option[(K, V)]

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

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

    Note: will not terminate for infinite-sized collections.

    B

    The result type of the function f.

    f

    The measuring function.

    cmp

    An ordering to be used for comparing elements.

    returns

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

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

    Finds the smallest element.

    Finds the smallest element.

    Note: will not terminate for infinite-sized collections.

    B

    The type over which the ordering is defined.

    ord

    An ordering to be used for comparing elements.

    returns

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

    Definition Classes
    IterableOnceOps
  89. final def mkString: String

    Displays all elements of this map in a string.

    Displays all elements of this map in a string.

    Delegates to addString, which can be overridden.

    returns

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

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

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

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

    Delegates to addString, which can be overridden.

    sep

    the separator string.

    returns

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

    Definition Classes
    IterableOnceOps
    Annotations
    @inline()
    Example:
    1. List(1, 2, 3).mkString("|") = "1|2|3"

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

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

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

    Delegates to addString, which can be overridden.

    start

    the starting string.

    sep

    the separator string.

    end

    the ending string.

    returns

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

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

  92. final def ne(arg0: AnyRef): Boolean

    Equivalent to !(this eq that).

    Equivalent to !(this eq that).

    returns

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

    Definition Classes
    AnyRef
  93. def nonEmpty: Boolean

    Tests whether the map is not empty.

    Tests whether the map is not empty.

    returns

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

    Definition Classes
    IterableOnceOps
    Annotations
    @deprecatedOverriding()
  94. final def notify(): Unit

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

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

    Definition Classes
    AnyRef
    Annotations
    @native()
    Note

    not specified by SLS as a member of AnyRef

  95. final def notifyAll(): Unit

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

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

    Definition Classes
    AnyRef
    Annotations
    @native()
    Note

    not specified by SLS as a member of AnyRef

  96. def orElse[A1 <: K, B1 >: V](that: PartialFunction[A1, B1]): PartialFunction[A1, B1]

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

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

    A1

    the argument type of the fallback function

    B1

    the result type of the fallback function

    that

    the fallback function

    returns

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

    Definition Classes
    PartialFunction
  97. def partition(p: ((K, V)) => Boolean): (C, C)

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

    A pair of, first, all elements that satisfy predicate p and, second, all elements that do not. Interesting because it splits a collection in two.

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

    Definition Classes
    IterableOps
  98. def partitionMap[A1, A2](f: ((K, V)) => Either[A1, A2]): (Iterable[A1], Iterable[A2])

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

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

    Example:

    val xs = `Map`(1, "one", 2, "two", 3, "three") partitionMap {
     case i: Int => Left(i)
     case s: String => Right(s)
    }
    // xs == (`Map`(1, 2, 3),
    //        `Map`(one, two, three))
    A1

    the element type of the first resulting collection

    A2

    the element type of the second resulting collection

    f

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

    returns

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

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

    Multiplies up the elements of this collection.

    Multiplies up the elements of this collection.

    Note: will not terminate for infinite-sized collections.

    B

    the result type of the * operator.

    num

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

    returns

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

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

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

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

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

    B

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

    op

    A binary operator that must be associative.

    returns

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

    Definition Classes
    IterableOnceOps
    Exceptions thrown

    UnsupportedOperationException if this map is empty.

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

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

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

    Note: will not terminate for infinite-sized collections.

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

    B

    the result type of the binary operator.

    op

    the binary operator.

    returns

    the result of inserting op between consecutive elements of this map, going left to right: op( op( ... op(x1, x2) ..., xn-1), xn) where x1, ..., xn are the elements of this map.

    Definition Classes
    IterableOnceOps
    Exceptions thrown

    UnsupportedOperationException if this map is empty.

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

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

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

    Note: will not terminate for infinite-sized collections.

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

    B

    the result type of the binary operator.

    op

    the binary operator.

    returns

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

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

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

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

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

    B

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

    op

    A binary operator that must be associative.

    returns

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

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

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

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

    Note: will not terminate for infinite-sized collections.

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

    B

    the result type of the binary operator.

    op

    the binary operator.

    returns

    the result of inserting op between consecutive elements of this map, going right to left: op(x1, op(x2, ..., op(xn-1, xn)...)) where x1, ..., xn are the elements of this map.

    Definition Classes
    IterableOnceOps
    Exceptions thrown

    UnsupportedOperationException if this map is empty.

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

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

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

    Note: will not terminate for infinite-sized collections.

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

    B

    the result type of the binary operator.

    op

    the binary operator.

    returns

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

    Definition Classes
    IterableOnceOps
  106. def reversed: Iterable[(K, V)]
    Attributes
    protected
    Definition Classes
    IterableOnceOps
  107. def runWith[U](action: (V) => U): (K) => Boolean

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

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

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

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

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

    action

    the action function

    returns

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

    Definition Classes
    PartialFunction
    See also

    applyOrElse.

  108. def scan[B >: (K, V)](z: B)(op: (B, B) => B): Iterable[B]

    Computes a prefix scan of the elements of the collection.

    Computes a prefix scan of the elements of the collection.

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

    B

    element type of the resulting collection

    z

    neutral element for the operator op

    op

    the associative operator for the scan

    returns

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

    Definition Classes
    IterableOps
  109. def scanLeft[B](z: B)(op: (B, (K, V)) => B): Iterable[B]

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

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

    Note: will not terminate for infinite-sized collections.

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

    B

    the type of the elements in the resulting collection

    z

    the initial value

    op

    the binary operator applied to the intermediate result and the element

    returns

    collection with intermediate results

    Definition Classes
    IterableOpsIterableOnceOps
  110. def scanRight[B](z: B)(op: ((K, V), B) => B): Iterable[B]

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

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

    Note: will not terminate for infinite-sized collections.

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

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

    Example:

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

    the type of the elements in the resulting collection

    z

    the initial value

    op

    the binary operator applied to the intermediate result and the element

    returns

    collection with intermediate results

    Definition Classes
    IterableOps
  111. def size: Int

    The size of this map.

    The size of this map.

    Note: will not terminate for infinite-sized collections.

    returns

    the number of elements in this map.

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

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

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

    that

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

    returns

    A value x where

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

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

    Definition Classes
    IterableOps
  113. def sizeCompare(otherSize: Int): Int

    Compares the size of this map to a test value.

    Compares the size of this map to a test value.

    otherSize

    the test value that gets compared with the size.

    returns

    A value x where

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

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

    Definition Classes
    IterableOps
    See also

    sizeIs

  114. final def sizeIs: SizeCompareOps

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

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

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

    this.sizeIs < size     // this.sizeCompare(size) < 0
    this.sizeIs <= size    // this.sizeCompare(size) <= 0
    this.sizeIs == size    // this.sizeCompare(size) == 0
    this.sizeIs != size    // this.sizeCompare(size) != 0
    this.sizeIs >= size    // this.sizeCompare(size) >= 0
    this.sizeIs > size     // this.sizeCompare(size) > 0
    Definition Classes
    IterableOps
    Annotations
    @inline()
  115. def slice(from: Int, until: Int): C

    Selects an interval of elements.

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

    from <= indexOf(x) < until

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

    from

    the lowest index to include from this map.

    until

    the lowest index to EXCLUDE from this map.

    returns

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

    Definition Classes
    IterableOpsIterableOnceOps
  116. def sliding(size: Int, step: Int): Iterator[C]

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

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

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

    size

    the number of elements per group

    step

    the distance between the first elements of successive groups

    returns

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

    Definition Classes
    IterableOps
    Examples:
    1. List(1, 2, 3, 4, 5).sliding(2, 2) = Iterator(List(1, 2), List(3, 4), List(5))

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

    See also

    scala.collection.Iterator, method sliding

  117. def sliding(size: Int): Iterator[C]

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

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

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

    size

    the number of elements per group

    returns

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

    Definition Classes
    IterableOps
    Examples:
    1. List().sliding(2) = empty iterator

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

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

    6. ,
    7. List(1, 2, 3).sliding(2) = Iterator(List(1, 2), List(2, 3))

    See also

    scala.collection.Iterator, method sliding

  118. def span(p: ((K, V)) => Boolean): (C, C)

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

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

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

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

    p

    the test predicate

    returns

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

    Definition Classes
    IterableOpsIterableOnceOps
  119. def splitAt(n: Int): (C, C)

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

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

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

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

    n

    the position at which to split.

    returns

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

    Definition Classes
    IterableOpsIterableOnceOps
  120. def stepper[S <: Stepper[_]](implicit shape: StepperShape[(K, V), S]): S

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

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

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

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

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

    Definition Classes
    IterableOnce
  121. def sum[B >: (K, V)](implicit num: math.Numeric[B]): B

    Sums up the elements of this collection.

    Sums up the elements of this collection.

    Note: will not terminate for infinite-sized collections.

    B

    the result type of the + operator.

    num

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

    returns

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

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

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

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

    returns

    the result of body

    Definition Classes
    AnyRef
  123. def tail: C

    The rest of the collection without its first element.

    The rest of the collection without its first element.

    Definition Classes
    IterableOps
  124. def tails: Iterator[C]

    Iterates over the tails of this map.

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

    returns

    an iterator over all the tails of this map

    Definition Classes
    IterableOps
    Example:
    1. List(1,2,3).tails = Iterator(List(1,2,3), List(2,3), List(3), Nil)

  125. def take(n: Int): C

    Selects the first n elements.

    Selects the first n elements.

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

    n

    the number of elements to take from this map.

    returns

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

    Definition Classes
    IterableOpsIterableOnceOps
  126. def takeRight(n: Int): C

    Selects the last n elements.

    Selects the last n elements.

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

    n

    the number of elements to take from this map.

    returns

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

    Definition Classes
    IterableOps
  127. def takeWhile(p: ((K, V)) => Boolean): C

    Takes longest prefix of elements that satisfy a predicate.

    Takes longest prefix of elements that satisfy a predicate.

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

    p

    The predicate used to test elements.

    returns

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

    Definition Classes
    IterableOpsIterableOnceOps
  128. def tapEach[U](f: ((K, V)) => U): C

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

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

    U

    the return type of f

    f

    a function to apply to each element in this map

    returns

    The same logical collection as this

    Definition Classes
    IterableOpsIterableOnceOps
  129. def to[C1](factory: Factory[(K, V), C1]): C1

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

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

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

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

    Convert collection to array.

    Convert collection to array.

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

    Definition Classes
    IterableOnceOps
  131. final def toBuffer[B >: (K, V)]: Buffer[B]
    Definition Classes
    IterableOnceOps
    Annotations
    @inline()
  132. def toIndexedSeq: immutable.IndexedSeq[(K, V)]
    Definition Classes
    IterableOnceOps
  133. def toList: immutable.List[(K, V)]
    Definition Classes
    IterableOnceOps
  134. def toMap[K, V](implicit ev: <:<[(K, V), (K, V)]): immutable.Map[K, V]
    Definition Classes
    IterableOnceOps
  135. def toSeq: immutable.Seq[(K, V)]

    returns

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

    Definition Classes
    IterableOnceOps
  136. def toSet[B >: (K, V)]: immutable.Set[B]
    Definition Classes
    IterableOnceOps
  137. def toString(): String

    Creates a String representation of this object.

    Creates a String representation of this object. The default representation is platform dependent. On the java platform it is the concatenation of the class name, "@", and the object's hashcode in hexadecimal.

    returns

    a String representation of the object.

    Definition Classes
    Function1 → AnyRef → Any
  138. def toVector: immutable.Vector[(K, V)]
    Definition Classes
    IterableOnceOps
  139. def transpose[B](implicit asIterable: ((K, V)) => Iterable[B]): Iterable[Iterable[B]]

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

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

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

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

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

    B

    the type of the elements of each iterable collection.

    asIterable

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

    returns

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

    Definition Classes
    IterableOps
    Exceptions thrown

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

  140. def unapply(a: K): Option[V]

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

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

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

    Converts an optional function to a partial function.

    Converts an optional function to a partial function.

    Implicit
    This member is added by an implicit conversion from MapOps[K, V, CC, C] toUnliftOps[K, B] performed by method UnliftOps in scala.Function1.This conversion will take place only if V is a subclass of Option[B] (V <: Option[B]).
    Definition Classes
    UnliftOps
    Example:
    1. Unlike Function.unlift, this UnliftOps.unlift method can be used in extractors.

      val of: Int => Option[String] = { i =>
        if (i == 2) {
          Some("matched by an optional function")
        } else {
          None
        }
      }
      
      util.Random.nextInt(4) match {
        case of.unlift(m) => // Convert an optional function to a pattern
          println(m)
        case _ =>
          println("Not matched")
      }
  142. def unzip[A1, A2](implicit asPair: ((K, V)) => (A1, A2)): (Iterable[A1], Iterable[A2])

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

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

    val xs = `Map`(
               (1, "one"),
               (2, "two"),
               (3, "three")).unzip
    // xs == (`Map`(1, 2, 3),
    //        `Map`(one, two, three))
    A1

    the type of the first half of the element pairs

    A2

    the type of the second half of the element pairs

    asPair

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

    returns

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

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

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

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

    val xs = `Map`(
               (1, "one", '1'),
               (2, "two", '2'),
               (3, "three", '3')).unzip3
    // xs == (`Map`(1, 2, 3),
    //        `Map`(one, two, three),
    //        `Map`(1, 2, 3))
    A1

    the type of the first member of the element triples

    A2

    the type of the second member of the element triples

    A3

    the type of the third member of the element triples

    asTriple

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

    returns

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

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

    Returns a Stepper for the values of this map.

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

  145. def values: Iterable[V]

    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.

  146. def valuesIterator: Iterator[V]

    Creates an iterator for all values in this map.

    Creates an iterator for all values in this map.

    returns

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

  147. def view: MapView[K, V]

    A view over the elements of this collection.

    A view over the elements of this collection.

    Definition Classes
    MapOpsIterableOps
  148. final def wait(): Unit

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

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

    not specified by SLS as a member of AnyRef

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

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

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

    not specified by SLS as a member of AnyRef

  150. final def wait(arg0: Long): Unit

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

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

    not specified by SLS as a member of AnyRef

  151. def withFilter(p: ((K, V)) => Boolean): WithFilter[(K, V), Iterable]

    Creates a non-strict filter of this map.

    Creates a non-strict filter of this map.

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

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

    p

    the predicate used to test elements.

    returns

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

    Definition Classes
    IterableOps
  152. def zip[B](that: IterableOnce[B]): Iterable[((K, V), B)]

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

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

    B

    the type of the second half of the returned pairs

    that

    The iterable providing the second half of each result pair

    returns

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

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

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

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

    that

    the iterable providing the second half of each result pair

    thisElem

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

    thatElem

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

    returns

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

    Definition Classes
    IterableOps
  154. def zipWithIndex: Iterable[((K, V), Int)]

    Zips this map with its indices.

    Zips this map with its indices.

    returns

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

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

Shadowed Implicit Value Members

  1. def +(other: String): String
    Implicit
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    Definition Classes
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Deprecated Value Members

  1. def +[V1 >: V](elem1: (K, V1), elem2: (K, V1), elems: (K, V1)*): CC[K, V1]
    Annotations
    @deprecated
    Deprecated

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

  2. def +[V1 >: V](kv: (K, V1)): CC[K, V1]
    Annotations
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    Deprecated

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

  3. def ++:[V1 >: V](that: IterableOnce[(K, V1)]): CC[K, V1]
    Annotations
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    Deprecated

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

  4. def ++:[B >: (K, V)](that: IterableOnce[B]): Iterable[B]
    Definition Classes
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    Annotations
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    Deprecated

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

  5. def --(keys: IterableOnce[K]): C
    Annotations
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    (Since version 2.13.0) Consider requiring an immutable Map.

  6. def /:[B](z: B)(op: (B, (K, V)) => B): B
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  7. final def /:[B](z: B)(op: (B, (K, V)) => B): B
    Definition Classes
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    Annotations
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    Deprecated

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  8. def :\[B](z: B)(op: ((K, V), B) => B): B
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  9. final def :\[B](z: B)(op: ((K, V), B) => B): B
    Definition Classes
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    (Since version 2.13.0) Use foldRight instead of :\

  10. def aggregate[B](z: => B)(seqop: (B, (K, V)) => B, combop: (B, B) => B): B
    Definition Classes
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    Annotations
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    Deprecated

    (Since version 2.13.0) aggregate is not relevant for sequential collections. Use foldLeft(z)(seqop) instead.

  11. def collectFirst[B](f: PartialFunction[(K, V), B]): Option[B]
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    (Since version 2.13.0) Use .iterator.collectFirst(...) instead

  12. def companion: IterableFactory[Iterable]
    Definition Classes
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    Annotations
    @deprecated @deprecatedOverriding() @inline()
    Deprecated

    (Since version 2.13.0) Use iterableFactory instead

  13. def copyToBuffer(dest: Buffer[(K, V)]): Unit
    Implicit
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  14. final def copyToBuffer[B >: (K, V)](dest: Buffer[B]): Unit
    Definition Classes
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    Annotations
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    Deprecated

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

  15. def count(f: ((K, V)) => Boolean): Int
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  16. def exists(f: ((K, V)) => Boolean): Boolean
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  17. def filter(f: ((K, V)) => Boolean): Iterator[(K, V)]
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  18. def filterKeys(p: (K) => Boolean): MapView[K, V]

    Filters this map by retaining only keys satisfying a predicate.

    Filters this map by retaining only keys satisfying a predicate.

    p

    the predicate used to test keys

    returns

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

    Annotations
    @deprecated
    Deprecated

    (Since version 2.13.0) Use .view.filterKeys(f). A future version will include a strict version of this method (for now, .view.filterKeys(p).toMap).

  19. def find(p: ((K, V)) => Boolean): Option[(K, V)]
    Implicit
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  20. def flatMap[B](f: ((K, V)) => IterableOnce[B]): IterableOnce[B]
    Implicit
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    (Since version 2.13.0) Use .iterator.flatMap instead or consider requiring an Iterable

  21. def fold[A1 >: A](z: A1)(op: (A1, A1) => A1): A1
    Implicit
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  22. def foldLeft[B](z: B)(op: (B, (K, V)) => B): B
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    (Since version 2.13.0) Use .iterator.foldLeft instead

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

  24. def forall(f: ((K, V)) => Boolean): Boolean
    Implicit
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  25. def foreach[U](f: ((K, V)) => U): Unit
    Implicit
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    (Since version 2.13.0) Use .iterator.foreach(...) instead

  26. def formatted(fmtstr: String): String

    Returns string formatted according to given format string.

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

    Implicit
    This member is added by an implicit conversion from MapOps[K, V, CC, C] toStringFormat[MapOps[K, V, CC, C]] performed by method StringFormat in scala.Predef.
    Definition Classes
    StringFormat
    Annotations
    @deprecated @inline()
    Deprecated

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

  27. def hasDefiniteSize: Boolean

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

    Tests whether this map is known to have a finite size. All strict collections are known to have finite size. For a non-strict collection such as Stream, the predicate returns true if all elements have been computed. It returns false if the stream is not yet evaluated to the end. Non-empty Iterators usually return false even if they were created from a collection with a known finite size.

    Note: many collection methods will not work on collections of infinite sizes. The typical failure mode is an infinite loop. These methods always attempt a traversal without checking first that hasDefiniteSize returns true. However, checking hasDefiniteSize can provide an assurance that size is well-defined and non-termination is not a concern.

    returns

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

    Definition Classes
    IterableOnceOps
    Annotations
    @deprecated
    Deprecated

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

    See also

    method knownSize for a more useful alternative

  28. def isEmpty: Boolean
    Implicit
    This member is added by an implicit conversion from MapOps[K, V, CC, C] toIterableOnceExtensionMethods[(K, V)] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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    (Since version 2.13.0) Use .iterator.isEmpty instead

  29. def map[B](f: ((K, V)) => B): IterableOnce[B]
    Implicit
    This member is added by an implicit conversion from MapOps[K, V, CC, C] toIterableOnceExtensionMethods[(K, V)] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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    (Since version 2.13.0) Use .iterator.map instead or consider requiring an Iterable

  30. def mapValues[W](f: (V) => W): MapView[K, W]

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

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

    f

    the function used to transform values of this map.

    returns

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

    Annotations
    @deprecated
    Deprecated

    (Since version 2.13.0) Use .view.mapValues(f). A future version will include a strict version of this method (for now, .view.mapValues(f).toMap).

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

  32. def maxBy[B](f: ((K, V)) => B)(implicit cmp: math.Ordering[B]): (K, V)
    Implicit
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    (Since version 2.13.0) Use .iterator.maxBy(...) instead

  33. def min(implicit ord: math.Ordering[(K, V)]): (K, V)
    Implicit
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  34. def minBy[B](f: ((K, V)) => B)(implicit cmp: math.Ordering[B]): (K, V)
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    (Since version 2.13.0) Use .iterator.minBy(...) instead

  35. def mkString: String
    Implicit
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  36. def mkString(sep: String): String
    Implicit
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  37. def mkString(start: String, sep: String, end: String): String
    Implicit
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  38. def nonEmpty: Boolean
    Implicit
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  39. def product(implicit num: math.Numeric[(K, V)]): (K, V)
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  40. def reduce(f: ((K, V), (K, V)) => (K, V)): (K, V)
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  41. def reduceLeft(f: ((K, V), (K, V)) => (K, V)): (K, V)
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  42. def reduceLeftOption(f: ((K, V), (K, V)) => (K, V)): Option[(K, V)]
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  43. def reduceOption(f: ((K, V), (K, V)) => (K, V)): Option[(K, V)]
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  44. def reduceRight(f: ((K, V), (K, V)) => (K, V)): (K, V)
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  45. def reduceRightOption(f: ((K, V), (K, V)) => (K, V)): Option[(K, V)]
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  46. final def repr: C
    Definition Classes
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    Annotations
    @deprecated
    Deprecated

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

  47. def sameElements[B >: A](that: IterableOnce[B]): Boolean
    Implicit
    This member is added by an implicit conversion from MapOps[K, V, CC, C] toIterableOnceExtensionMethods[(K, V)] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
    Definition Classes
    IterableOnceExtensionMethods
    Annotations
    @deprecated
    Deprecated

    (Since version 2.13.0) Use .iterator.sameElements instead

  48. def size: Int
    Implicit
    This member is added by an implicit conversion from MapOps[K, V, CC, C] toIterableOnceExtensionMethods[(K, V)] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
    Shadowing
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    To access this member you can use a type ascription:
    (mapOps: IterableOnceExtensionMethods[(K, V)]).size
    Definition Classes
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    Annotations
    @deprecated
    Deprecated

    (Since version 2.13.0) Use .iterator.size instead

  49. def sum(implicit num: math.Numeric[(K, V)]): (K, V)
    Implicit
    This member is added by an implicit conversion from MapOps[K, V, CC, C] toIterableOnceExtensionMethods[(K, V)] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
    Shadowing
    This implicitly inherited member is shadowed by one or more members in this class.
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    (mapOps: IterableOnceExtensionMethods[(K, V)]).sum(num)
    Definition Classes
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    @deprecated
    Deprecated

    (Since version 2.13.0) Use .iterator.sum instead

  50. def to[C1](factory: Factory[(K, V), C1]): C1
    Implicit
    This member is added by an implicit conversion from MapOps[K, V, CC, C] toIterableOnceExtensionMethods[(K, V)] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
    Shadowing
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    (mapOps: IterableOnceExtensionMethods[(K, V)]).to(factory)
    Definition Classes
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    @deprecated
    Deprecated

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

  51. def toArray[B >: A](implicit arg0: ClassTag[B]): Array[B]
    Implicit
    This member is added by an implicit conversion from MapOps[K, V, CC, C] toIterableOnceExtensionMethods[(K, V)] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
    Shadowing
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    (mapOps: IterableOnceExtensionMethods[(K, V)]).toArray(arg0)
    Definition Classes
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    @deprecated
    Deprecated

    (Since version 2.13.0) Use .iterator.toArray

  52. def toBuffer[B >: A]: Buffer[B]
    Implicit
    This member is added by an implicit conversion from MapOps[K, V, CC, C] toIterableOnceExtensionMethods[(K, V)] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
    Shadowing
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    (mapOps: IterableOnceExtensionMethods[(K, V)]).toBuffer
    Definition Classes
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    Annotations
    @deprecated
    Deprecated

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

  53. def toIndexedSeq: IndexedSeq[(K, V)]
    Implicit
    This member is added by an implicit conversion from MapOps[K, V, CC, C] toIterableOnceExtensionMethods[(K, V)] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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    (mapOps: IterableOnceExtensionMethods[(K, V)]).toIndexedSeq
    Definition Classes
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    @deprecated
    Deprecated

    (Since version 2.13.0) Use .iterator.toIndexedSeq instead

  54. final def toIterable: Iterable[(K, V)]
    Implicit
    This member is added by an implicit conversion from MapOps[K, V, CC, C] toIterableOnceExtensionMethods[(K, V)] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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    (mapOps: IterableOnceExtensionMethods[(K, V)]).toIterable
    Definition Classes
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    @deprecated @inline()
    Deprecated

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

  55. def toIterator: Iterator[(K, V)]
    Implicit
    This member is added by an implicit conversion from MapOps[K, V, CC, C] toIterableOnceExtensionMethods[(K, V)] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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    (mapOps: IterableOnceExtensionMethods[(K, V)]).toIterator
    Definition Classes
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    Deprecated

    (Since version 2.13.0) Use .iterator instead

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

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

  57. def toList: immutable.List[(K, V)]
    Implicit
    This member is added by an implicit conversion from MapOps[K, V, CC, C] toIterableOnceExtensionMethods[(K, V)] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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    (mapOps: IterableOnceExtensionMethods[(K, V)]).toList
    Definition Classes
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    @deprecated
    Deprecated

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

  58. def toMap[K, V](implicit ev: <:<[(K, V), (K, V)]): immutable.Map[K, V]
    Implicit
    This member is added by an implicit conversion from MapOps[K, V, CC, C] toIterableOnceExtensionMethods[(K, V)] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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    (mapOps: IterableOnceExtensionMethods[(K, V)]).toMap(ev)
    Definition Classes
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    @deprecated
    Deprecated

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

  59. def toSeq: immutable.Seq[(K, V)]
    Implicit
    This member is added by an implicit conversion from MapOps[K, V, CC, C] toIterableOnceExtensionMethods[(K, V)] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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    Deprecated

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

  60. def toSet[B >: A]: immutable.Set[B]
    Implicit
    This member is added by an implicit conversion from MapOps[K, V, CC, C] toIterableOnceExtensionMethods[(K, V)] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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    (mapOps: IterableOnceExtensionMethods[(K, V)]).toSet
    Definition Classes
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    @deprecated @inline()
    Deprecated

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

  61. def toStream: immutable.Stream[(K, V)]
    Implicit
    This member is added by an implicit conversion from MapOps[K, V, CC, C] toIterableOnceExtensionMethods[(K, V)] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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    (mapOps: IterableOnceExtensionMethods[(K, V)]).toStream
    Definition Classes
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    @deprecated @inline()
    Deprecated

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

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

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

  63. final def toTraversable: Traversable[(K, V)]
    Implicit
    This member is added by an implicit conversion from MapOps[K, V, CC, C] toIterableOnceExtensionMethods[(K, V)] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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    (mapOps: IterableOnceExtensionMethods[(K, V)]).toTraversable
    Definition Classes
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    Annotations
    @deprecated @inline()
    Deprecated

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

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

    Converts this map to an unspecified Iterable.

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

    returns

    An Iterable containing all elements of this map.

    Definition Classes
    IterableOps
    Annotations
    @deprecated
    Deprecated

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

  65. def toVector: immutable.Vector[(K, V)]
    Implicit
    This member is added by an implicit conversion from MapOps[K, V, CC, C] toIterableOnceExtensionMethods[(K, V)] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
    Shadowing
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    (mapOps: IterableOnceExtensionMethods[(K, V)]).toVector
    Definition Classes
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    Annotations
    @deprecated @inline()
    Deprecated

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

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

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

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

    Definition Classes
    IterableOps
    Annotations
    @deprecated
    Deprecated

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

  67. def withFilter(f: ((K, V)) => Boolean): Iterator[(K, V)]
    Implicit
    This member is added by an implicit conversion from MapOps[K, V, CC, C] toIterableOnceExtensionMethods[(K, V)] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
    Shadowing
    This implicitly inherited member is shadowed by one or more members in this class.
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    (mapOps: IterableOnceExtensionMethods[(K, V)]).withFilter(f)
    Definition Classes
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    Annotations
    @deprecated
    Deprecated

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

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

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

Inherited from PartialFunction[K, V]

Inherited from (K) => V

Inherited from IterableOps[(K, V), Iterable, C]

Inherited from IterableOnceOps[(K, V), Iterable, C]

Inherited from IterableOnce[(K, V)]

Inherited from AnyRef

Inherited from Any

Inherited by implicit conversion UnliftOps fromMapOps[K, V, CC, C] to UnliftOps[K, B]

Inherited by implicit conversion iterableOnceExtensionMethods fromMapOps[K, V, CC, C] to IterableOnceExtensionMethods[(K, V)]

Inherited by implicit conversion any2stringadd fromMapOps[K, V, CC, C] to any2stringadd[MapOps[K, V, CC, C]]

Inherited by implicit conversion StringFormat fromMapOps[K, V, CC, C] to StringFormat[MapOps[K, V, CC, C]]

Inherited by implicit conversion Ensuring fromMapOps[K, V, CC, C] to Ensuring[MapOps[K, V, CC, C]]

Inherited by implicit conversion ArrowAssoc fromMapOps[K, V, CC, C] to ArrowAssoc[MapOps[K, V, CC, C]]

Ungrouped