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scala.collection

MapFactoryDefaults

trait MapFactoryDefaults[K, +V, +CC[x, y] <: IterableOps[(x, y), Iterable, Iterable[(x, y)]], +WithFilterCC[x] <: IterableOps[x, WithFilterCC, WithFilterCC[x]] with Iterable[x]] extends MapOps[K, V, CC, CC[K, V]] with IterableOps[(K, V), WithFilterCC, CC[K, V]]

This trait provides default implementations for the factory methods fromSpecific and newSpecificBuilder that need to be refined when implementing a collection type that refines the CC and C type parameters. It is used for maps.

Note that in maps, the CC type of the map is not the same as the CC type for the underlying iterable (which is fixed to Map in MapOps). This trait has therefore two type parameters CC and WithFilterCC. The withFilter method inherited from IterableOps is overridden with a compatible default implementation.

The default implementations in this trait can be used in the common case when CC[A] is the same as C.

Source
Iterable.scala
Linear Supertypes
MapOps[K, V, CC, CC[K, V @scala.annotation.unchecked.uncheckedVariance]], PartialFunction[K, V], (K) => V, IterableOps[(K, V), [_]WithFilterCC[_], CC[K, V @scala.annotation.unchecked.uncheckedVariance]], IterableOnceOps[(K, V), [_]WithFilterCC[_], CC[K, V @scala.annotation.unchecked.uncheckedVariance]], IterableOnce[(K, V)], AnyRef, Any
Type Hierarchy
Ordering
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Inherited
  1. MapFactoryDefaults
  2. MapOps
  3. PartialFunction
  4. Function1
  5. IterableOps
  6. IterableOnceOps
  7. IterableOnce
  8. AnyRef
  9. 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

Abstract Value Members

  1. 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.

    Definition Classes
    MapOps
  2. abstract def iterableFactory: IterableFactory[[_]WithFilterCC[_]]

    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).

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

    Iterator can be used only once

    Iterator can be used only once

    Definition Classes
    IterableOnce
  4. 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.

    Definition Classes
    MapOps
    Note

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

  5. 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. def ++[V2 >: V](xs: IterableOnce[(K, V2)]): CC[K, V2]

    Alias for concat

    Alias for concat

    Definition Classes
    MapOps
  2. final def ++[B >: (K, V)](suffix: IterableOnce[B]): WithFilterCC[B]

    Alias for concat

    Alias for concat

    Definition Classes
    IterableOps
    Annotations
    @inline()
  3. def addString(sb: mutable.StringBuilder, start: String, sep: String, end: String): sb.type

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

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

    Example:

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

    the starting string.

    sep

    the separator string.

    end

    the ending string.

    returns

    the string builder b to which elements were appended.

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

    Appends all elements of this map to a string builder.

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

    Example:

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

    the string builder to which elements are appended.

    returns

    the string builder b to which elements were appended.

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

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

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

    Example:

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

    the string builder to which elements are appended.

    sep

    the separator string.

    returns

    the string builder b to which elements were appended.

    Definition Classes
    IterableOnceOps
    Annotations
    @inline()
  6. 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
  7. 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
  8. 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])
  9. 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
  10. 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.

    Definition Classes
    MapOps
  11. def collect[B](pf: PartialFunction[(K, V), B]): WithFilterCC[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
  12. 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)

  13. 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
  14. 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()
  15. 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 iterable to append.

    returns

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

    Definition Classes
    MapOps
  16. def concat[B >: (K, V)](suffix: IterableOnce[B]): WithFilterCC[B]

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

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

    B

    the element type of the returned collection.

    suffix

    the iterable to append.

    returns

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

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

    Tests whether this map contains a binding for a key.

    Tests whether this map contains a binding for a key.

    key

    the key

    returns

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

    Definition Classes
    MapOps
  18. 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.

  19. 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.

  20. 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.

  21. 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
  22. 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
  23. 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.

    Definition Classes
    MapOps
    Annotations
    @throws(cause = scala.this.throws.<init>$default$1[NoSuchElementException])
    Exceptions thrown
  24. def drop(n: Int): CC[K, V @scala.annotation.unchecked.uncheckedVariance]

    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
  25. def dropRight(n: Int): CC[K, V @scala.annotation.unchecked.uncheckedVariance]

    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
  26. def dropWhile(p: ((K, V)) => Boolean): CC[K, V @scala.annotation.unchecked.uncheckedVariance]

    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
  27. 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
      }
  28. def empty: CC[K, V]

    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
    MapFactoryDefaultsIterableOps
  29. 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
  30. def filter(pred: ((K, V)) => Boolean): CC[K, V @scala.annotation.unchecked.uncheckedVariance]

    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
  31. def filterNot(pred: ((K, V)) => Boolean): CC[K, V @scala.annotation.unchecked.uncheckedVariance]

    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
  32. 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
  33. 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.

    Definition Classes
    MapOps
  34. def flatMap[B](f: ((K, V)) => IterableOnce[B]): WithFilterCC[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
  35. def flatten[B](implicit asIterable: ((K, V)) => IterableOnce[B]): WithFilterCC[B]

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

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

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

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

    the type of the elements of each iterable collection.

    asIterable

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

    returns

    a new map resulting from concatenating all element maps.

    Definition Classes
    IterableOpsIterableOnceOps
  36. 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
  37. 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
  38. 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
  39. 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
  40. 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
  41. def foreachEntry[U](f: (K, V) => U): Unit

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

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

    Definition Classes
    MapOps
  42. def getOrElse[V1 >: V](key: K, default: => V1): V1

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

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

    V1

    the result type of the default computation.

    key

    the key.

    default

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

    returns

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

    Definition Classes
    MapOps
  43. def groupBy[K](f: ((K, V)) => K): immutable.Map[K, CC[K, V @scala.annotation.unchecked.uncheckedVariance]]

    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
  44. def groupMap[K, B](key: ((K, V)) => K)(f: ((K, V)) => B): immutable.Map[K, WithFilterCC[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
  45. 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
  46. def grouped(size: Int): Iterator[CC[K, V @scala.annotation.unchecked.uncheckedVariance]]

    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

  47. 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.

  48. 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
  49. def init: CC[K, V @scala.annotation.unchecked.uncheckedVariance]

    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
  50. def inits: Iterator[CC[K, V @scala.annotation.unchecked.uncheckedVariance]]

    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)

  51. 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
  52. def isEmpty: Boolean

    Tests whether the map is empty.

    Tests whether the map is empty.

    Note: The default implementation creates and discards an iterator.

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

    returns

    true if the map contains no elements, false otherwise.

    Definition Classes
    IterableOnceOps
  53. 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
  54. 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.

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

    Returns a Stepper for the keys of this map.

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

    Definition Classes
    MapOps
  56. 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.

    Definition Classes
    MapOps
  57. def keysIterator: Iterator[K]

    Creates an iterator for all keys.

    Creates an iterator for all keys.

    returns

    an iterator over all keys.

    Definition Classes
    MapOps
  58. 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
  59. 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.

  60. 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
  61. 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

  62. 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.

    Definition Classes
    MapOps
  63. def map[B](f: ((K, V)) => B): WithFilterCC[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
  64. 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.

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

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

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

    Note: will not terminate for infinite-sized collections.

    B

    The result type of the function f.

    f

    The measuring function.

    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.

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

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

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

    Note: will not terminate for infinite-sized collections.

    B

    The result type of the function f.

    f

    The measuring function.

    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
  67. 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
  68. 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.

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

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

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

    Note: will not terminate for infinite-sized collections.

    B

    The result type of the function f.

    f

    The measuring function.

    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.

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

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

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

    Note: will not terminate for infinite-sized collections.

    B

    The result type of the function f.

    f

    The measuring function.

    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
  71. 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
  72. 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()
  73. 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"

  74. 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)"

  75. 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()
  76. 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
  77. def partition(p: ((K, V)) => Boolean): (CC[K, V @scala.annotation.unchecked.uncheckedVariance], CC[K, V @scala.annotation.unchecked.uncheckedVariance])

    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
  78. def partitionMap[A1, A2](f: ((K, V)) => Either[A1, A2]): (WithFilterCC[A1], WithFilterCC[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
  79. def product[B >: (K, V)](implicit num: math.Numeric[B]): B

    Multiplies together the elements of this collection.

    Multiplies together the elements of this collection.

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

    Note: will not terminate for infinite-sized collections.

    B

    the result type of the * operator.

    num

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

    returns

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

    Definition Classes
    IterableOnceOps
  80. 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.

  81. 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.

  82. 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
  83. 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
  84. 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.

  85. 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
  86. 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.

  87. def scan[B >: (K, V)](z: B)(op: (B, B) => B): WithFilterCC[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
  88. def scanLeft[B](z: B)(op: (B, (K, V)) => B): WithFilterCC[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
  89. def scanRight[B](z: B)(op: ((K, V), B) => B): WithFilterCC[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
  90. 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
  91. 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
  92. 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

  93. 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()
  94. def slice(from: Int, until: Int): CC[K, V @scala.annotation.unchecked.uncheckedVariance]

    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
  95. def sliding(size: Int, step: Int): Iterator[CC[K, V @scala.annotation.unchecked.uncheckedVariance]]

    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

  96. def sliding(size: Int): Iterator[CC[K, V @scala.annotation.unchecked.uncheckedVariance]]

    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

  97. def span(p: ((K, V)) => Boolean): (CC[K, V @scala.annotation.unchecked.uncheckedVariance], CC[K, V @scala.annotation.unchecked.uncheckedVariance])

    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
  98. def splitAt(n: Int): (CC[K, V @scala.annotation.unchecked.uncheckedVariance], CC[K, V @scala.annotation.unchecked.uncheckedVariance])

    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
  99. 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
  100. def sum[B >: (K, V)](implicit num: math.Numeric[B]): B

    Sums the elements of this collection.

    Sums the elements of this collection.

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

    Note: will not terminate for infinite-sized collections.

    B

    the result type of the + operator.

    num

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

    returns

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

    Definition Classes
    IterableOnceOps
  101. def tail: CC[K, V @scala.annotation.unchecked.uncheckedVariance]

    The rest of the collection without its first element.

    The rest of the collection without its first element.

    Definition Classes
    IterableOps
  102. def tails: Iterator[CC[K, V @scala.annotation.unchecked.uncheckedVariance]]

    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)

  103. def take(n: Int): CC[K, V @scala.annotation.unchecked.uncheckedVariance]

    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
  104. def takeRight(n: Int): CC[K, V @scala.annotation.unchecked.uncheckedVariance]

    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
  105. def takeWhile(p: ((K, V)) => Boolean): CC[K, V @scala.annotation.unchecked.uncheckedVariance]

    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
  106. def tapEach[U](f: ((K, V)) => U): CC[K, V @scala.annotation.unchecked.uncheckedVariance]

    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
  107. 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
  108. 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
  109. final def toBuffer[B >: (K, V)]: Buffer[B]
    Definition Classes
    IterableOnceOps
    Annotations
    @inline()
  110. def toIndexedSeq: immutable.IndexedSeq[(K, V)]
    Definition Classes
    IterableOnceOps
  111. def toList: immutable.List[(K, V)]
    Definition Classes
    IterableOnceOps
  112. def toMap[K, V](implicit ev: <:<[(K, V), (K, V)]): immutable.Map[K, V]
    Definition Classes
    IterableOnceOps
  113. 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
  114. def toSet[B >: (K, V)]: immutable.Set[B]
    Definition Classes
    IterableOnceOps
  115. 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
  116. def toVector: immutable.Vector[(K, V)]
    Definition Classes
    IterableOnceOps
  117. def transpose[B](implicit asIterable: ((K, V)) => Iterable[B]): WithFilterCC[WithFilterCC[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.

  118. 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
  119. 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 MapFactoryDefaults[K, V, CC, WithFilterCC] 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")
      }
  120. def unzip[A1, A2](implicit asPair: ((K, V)) => (A1, A2)): (WithFilterCC[A1], WithFilterCC[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
  121. def unzip3[A1, A2, A3](implicit asTriple: ((K, V)) => (A1, A2, A3)): (WithFilterCC[A1], WithFilterCC[A2], WithFilterCC[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
  122. def valueStepper[S <: Stepper[_]](implicit shape: StepperShape[V, S]): S

    Returns a Stepper for the values of this map.

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

    Definition Classes
    MapOps
  123. 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.

    Definition Classes
    MapOps
  124. def valuesIterator: Iterator[V]

    Creates an iterator for all values in this map.

    Creates an iterator for all values in this map.

    returns

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

    Definition Classes
    MapOps
  125. def view: MapView[K, V]

    A view over the elements of this collection.

    A view over the elements of this collection.

    Definition Classes
    MapOpsIterableOps
  126. def withFilter(p: ((K, V)) => Boolean): MapOps.WithFilter[K, V, WithFilterCC, CC]

    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
    MapFactoryDefaultsIterableOps
  127. def zip[B](that: IterableOnce[B]): WithFilterCC[((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
  128. def zipAll[A1 >: (K, V), B](that: Iterable[B], thisElem: A1, thatElem: B): WithFilterCC[(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
  129. def zipWithIndex: WithFilterCC[((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))

Deprecated Value Members

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

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

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

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

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

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

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

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

  5. def --(keys: IterableOnce[K]): CC[K, V @scala.annotation.unchecked.uncheckedVariance]
    Definition Classes
    MapOps
    Annotations
    @deprecated @inline()
    Deprecated

    (Since version 2.13.0) Consider requiring an immutable Map.

  6. def /:[B](z: B)(op: (B, (K, V)) => B): B
    Implicit
    This member is added by an implicit conversion from MapFactoryDefaults[K, V, CC, WithFilterCC] toIterableOnceExtensionMethods[(K, V)] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
    Shadowing
    This implicitly inherited member is shadowed by one or more members in this class.
    To access this member you can use a type ascription:
    (mapFactoryDefaults: IterableOnceExtensionMethods[(K, V)])./:(z)(op)
    Definition Classes
    IterableOnceExtensionMethods
    Annotations
    @deprecated @inline()
    Deprecated

    (Since version 2.13.0) Use .iterator.foldLeft instead

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

    (Since version 2.13.0) Use foldLeft instead of /:

  8. def :\[B](z: B)(op: ((K, V), B) => B): B
    Implicit
    This member is added by an implicit conversion from MapFactoryDefaults[K, V, CC, WithFilterCC] toIterableOnceExtensionMethods[(K, V)] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
    Shadowing
    This implicitly inherited member is shadowed by one or more members in this class.
    To access this member you can use a type ascription:
    (mapFactoryDefaults: IterableOnceExtensionMethods[(K, V)]).:\(z)(op)
    Definition Classes
    IterableOnceExtensionMethods
    Annotations
    @deprecated @inline()
    Deprecated

    (Since version 2.13.0) Use .iterator.foldRight instead

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

    (Since version 2.13.0) Use foldRight instead of :\

  10. def aggregate[B](z: => B)(seqop: (B, (K, V)) => B, combop: (B, B) => B): B
    Definition Classes
    IterableOnceOps
    Annotations
    @deprecated
    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]
    Implicit
    This member is added by an implicit conversion from MapFactoryDefaults[K, V, CC, WithFilterCC] toIterableOnceExtensionMethods[(K, V)] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
    Shadowing
    This implicitly inherited member is shadowed by one or more members in this class.
    To access this member you can use a type ascription:
    (mapFactoryDefaults: IterableOnceExtensionMethods[(K, V)]).collectFirst(f)
    Definition Classes
    IterableOnceExtensionMethods
    Annotations
    @deprecated
    Deprecated

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

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

    (Since version 2.13.0) Use iterableFactory instead

  13. def copyToBuffer(dest: Buffer[(K, V)]): Unit
    Implicit
    This member is added by an implicit conversion from MapFactoryDefaults[K, V, CC, WithFilterCC] toIterableOnceExtensionMethods[(K, V)] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
    Shadowing
    This implicitly inherited member is shadowed by one or more members in this class.
    To access this member you can use a type ascription:
    (mapFactoryDefaults: IterableOnceExtensionMethods[(K, V)]).copyToBuffer(dest)
    Definition Classes
    IterableOnceExtensionMethods
    Annotations
    @deprecated
    Deprecated

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

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

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

  15. def count(f: ((K, V)) => Boolean): Int
    Implicit
    This member is added by an implicit conversion from MapFactoryDefaults[K, V, CC, WithFilterCC] toIterableOnceExtensionMethods[(K, V)] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
    Shadowing
    This implicitly inherited member is shadowed by one or more members in this class.
    To access this member you can use a type ascription:
    (mapFactoryDefaults: IterableOnceExtensionMethods[(K, V)]).count(f)
    Definition Classes
    IterableOnceExtensionMethods
    Annotations
    @deprecated
    Deprecated

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

  16. def exists(f: ((K, V)) => Boolean): Boolean
    Implicit
    This member is added by an implicit conversion from MapFactoryDefaults[K, V, CC, WithFilterCC] toIterableOnceExtensionMethods[(K, V)] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
    Shadowing
    This implicitly inherited member is shadowed by one or more members in this class.
    To access this member you can use a type ascription:
    (mapFactoryDefaults: IterableOnceExtensionMethods[(K, V)]).exists(f)
    Definition Classes
    IterableOnceExtensionMethods
    Annotations
    @deprecated
    Deprecated

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

  17. def filter(f: ((K, V)) => Boolean): Iterator[(K, V)]
    Implicit
    This member is added by an implicit conversion from MapFactoryDefaults[K, V, CC, WithFilterCC] toIterableOnceExtensionMethods[(K, V)] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
    Shadowing
    This implicitly inherited member is shadowed by one or more members in this class.
    To access this member you can use a type ascription:
    (mapFactoryDefaults: IterableOnceExtensionMethods[(K, V)]).filter(f)
    Definition Classes
    IterableOnceExtensionMethods
    Annotations
    @deprecated
    Deprecated

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

  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.

    Definition Classes
    MapOps
    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
    This member is added by an implicit conversion from MapFactoryDefaults[K, V, CC, WithFilterCC] toIterableOnceExtensionMethods[(K, V)] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
    Shadowing
    This implicitly inherited member is shadowed by one or more members in this class.
    To access this member you can use a type ascription:
    (mapFactoryDefaults: IterableOnceExtensionMethods[(K, V)]).find(p)
    Definition Classes
    IterableOnceExtensionMethods
    Annotations
    @deprecated
    Deprecated

    (Since version 2.13.0) Use .iterator.find instead

  20. def flatMap[B](f: ((K, V)) => IterableOnce[B]): IterableOnce[B]
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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
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  22. def foldLeft[B](z: B)(op: (B, (K, V)) => B): B
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  23. def foldRight[B](z: B)(op: ((K, V), B) => B): B
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  24. def forall(f: ((K, V)) => Boolean): Boolean
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  25. def foreach[U](f: ((K, V)) => U): Unit
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  26. 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.

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    (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

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

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

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

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

    f

    the function used to transform values of this map.

    returns

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

    Definition Classes
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    (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).

  30. def max(implicit ord: math.Ordering[(K, V)]): (K, V)
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  31. def maxBy[B](f: ((K, V)) => B)(implicit cmp: math.Ordering[B]): (K, V)
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  32. def min(implicit ord: math.Ordering[(K, V)]): (K, V)
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  33. def minBy[B](f: ((K, V)) => B)(implicit cmp: math.Ordering[B]): (K, V)
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  34. def mkString: String
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  35. def mkString(sep: String): String
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  36. def mkString(start: String, sep: String, end: String): String
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  37. def nonEmpty: Boolean
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  38. def product(implicit num: math.Numeric[(K, V)]): (K, V)
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  39. def reduce(f: ((K, V), (K, V)) => (K, V)): (K, V)
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  40. def reduceLeft(f: ((K, V), (K, V)) => (K, V)): (K, V)
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  41. def reduceLeftOption(f: ((K, V), (K, V)) => (K, V)): Option[(K, V)]
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  42. def reduceOption(f: ((K, V), (K, V)) => (K, V)): Option[(K, V)]
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  43. def reduceRight(f: ((K, V), (K, V)) => (K, V)): (K, V)
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  44. def reduceRightOption(f: ((K, V), (K, V)) => (K, V)): Option[(K, V)]
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  45. final def repr: CC[K, V @scala.annotation.unchecked.uncheckedVariance]
    Definition Classes
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    (Since version 2.13.0) Use coll instead of repr in a collection implementation, use the collection value itself from the outside

  46. def sameElements[B >: A](that: IterableOnce[B]): Boolean
    Implicit
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  47. def size: Int
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  48. def sum(implicit num: math.Numeric[(K, V)]): (K, V)
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  49. def to[C1](factory: Factory[(K, V), C1]): C1
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  50. def toArray[B >: A](implicit arg0: ClassTag[B]): Array[B]
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  51. def toBuffer[B >: A]: Buffer[B]
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  52. def toIndexedSeq: IndexedSeq[(K, V)]
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  53. final def toIterable: Iterable[(K, V)]
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  54. def toIterator: Iterator[(K, V)]
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  55. final def toIterator: Iterator[(K, V)]
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  56. def toList: immutable.List[(K, V)]
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  57. def toMap[K, V](implicit ev: <:<[(K, V), (K, V)]): immutable.Map[K, V]
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  58. def toSeq: immutable.Seq[(K, V)]
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  59. def toSet[B >: A]: immutable.Set[B]
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  60. def toStream: immutable.Stream[(K, V)]
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  61. final def toStream: immutable.Stream[(K, V)]
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  62. final def toTraversable: Traversable[(K, V)]
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  63. 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
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    @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

  64. def toVector: immutable.Vector[(K, V)]
    Implicit
    This member is added by an implicit conversion from MapFactoryDefaults[K, V, CC, WithFilterCC] toIterableOnceExtensionMethods[(K, V)] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
    Shadowing
    This implicitly inherited member is shadowed by one or more members in this class.
    To access this member you can use a type ascription:
    (mapFactoryDefaults: IterableOnceExtensionMethods[(K, V)]).toVector
    Definition Classes
    IterableOnceExtensionMethods
    Annotations
    @deprecated @inline()
    Deprecated

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

  65. 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)

  66. def withFilter(f: ((K, V)) => Boolean): Iterator[(K, V)]
    Implicit
    This member is added by an implicit conversion from MapFactoryDefaults[K, V, CC, WithFilterCC] toIterableOnceExtensionMethods[(K, V)] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
    Shadowing
    This implicitly inherited member is shadowed by one or more members in this class.
    To access this member you can use a type ascription:
    (mapFactoryDefaults: IterableOnceExtensionMethods[(K, V)]).withFilter(f)
    Definition Classes
    IterableOnceExtensionMethods
    Annotations
    @deprecated
    Deprecated

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