Packages

class HashMap[A, B] extends AbstractMap[A, B] with Map[A, B] with MapLike[A, B, HashMap[A, B]] with HashTable[A, DefaultEntry[A, B]] with CustomParallelizable[(A, B), ParHashMap[A, B]] with Serializable

This class implements mutable maps using a hashtable.

A

the type of the keys contained in this hash map.

B

the type of the values assigned to keys in this hash map.

Annotations
@SerialVersionUID()
Source
HashMap.scala
Since

1

See also

"Scala's Collection Library overview" section on Hash Tables for more information.

Linear Supertypes
Serializable, java.io.Serializable, CustomParallelizable[(A, B), ParHashMap[A, B]], HashTable[A, DefaultEntry[A, B]], HashUtils[A], AbstractMap[A, B], Map[A, B], MapLike[A, B, HashMap[A, B]], Cloneable[HashMap[A, B]], scala.Cloneable, java.lang.Cloneable, Shrinkable[A], Builder[(A, B), HashMap[A, B]], Growable[(A, B)], Clearable, Iterable[(A, B)], Traversable[(A, B)], Mutable, collection.AbstractMap[A, B], collection.Map[A, B], collection.MapLike[A, B, HashMap[A, B]], Subtractable[A, HashMap[A, B]], PartialFunction[A, B], (A) ⇒ B, GenMap[A, B], GenMapLike[A, B, HashMap[A, B]], collection.AbstractIterable[(A, B)], collection.Iterable[(A, B)], IterableLike[(A, B), HashMap[A, B]], Equals, GenIterable[(A, B)], GenIterableLike[(A, B), HashMap[A, B]], AbstractTraversable[(A, B)], collection.Traversable[(A, B)], GenTraversable[(A, B)], GenericTraversableTemplate[(A, B), Iterable], TraversableLike[(A, B), HashMap[A, B]], GenTraversableLike[(A, B), HashMap[A, B]], Parallelizable[(A, B), ParHashMap[A, B]], TraversableOnce[(A, B)], GenTraversableOnce[(A, B)], FilterMonadic[(A, B), HashMap[A, B]], HasNewBuilder[(A, B), HashMap[A, B]], AnyRef, Any
Ordering
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Inherited
  1. HashMap
  2. Serializable
  3. Serializable
  4. CustomParallelizable
  5. HashTable
  6. HashUtils
  7. AbstractMap
  8. Map
  9. MapLike
  10. Cloneable
  11. Cloneable
  12. Cloneable
  13. Shrinkable
  14. Builder
  15. Growable
  16. Clearable
  17. Iterable
  18. Traversable
  19. Mutable
  20. AbstractMap
  21. Map
  22. MapLike
  23. Subtractable
  24. PartialFunction
  25. Function1
  26. GenMap
  27. GenMapLike
  28. AbstractIterable
  29. Iterable
  30. IterableLike
  31. Equals
  32. GenIterable
  33. GenIterableLike
  34. AbstractTraversable
  35. Traversable
  36. GenTraversable
  37. GenericTraversableTemplate
  38. TraversableLike
  39. GenTraversableLike
  40. Parallelizable
  41. TraversableOnce
  42. GenTraversableOnce
  43. FilterMonadic
  44. HasNewBuilder
  45. AnyRef
  46. Any
Implicitly
  1. by CollectionsHaveToParArray
  2. by MonadOps
  3. by any2stringadd
  4. by StringFormat
  5. by Ensuring
  6. by ArrowAssoc
  7. by alternateImplicit
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Visibility
  1. Public
  2. All

Instance Constructors

  1. new HashMap()

Type Members

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

    The implementation class of the set returned by keySet.

    The implementation class of the set returned by keySet.

    Attributes
    protected
    Definition Classes
    MapLike
  2. class DefaultValuesIterable extends AbstractIterable[V] with Iterable[V] with Serializable

    The implementation class of the iterable returned by values.

    The implementation class of the iterable returned by values.

    Attributes
    protected
    Definition Classes
    MapLike
  3. class FilteredKeys extends AbstractMap[K, V] with DefaultMap[K, V]
    Attributes
    protected
    Definition Classes
    MapLike
  4. class MappedValues[W] extends AbstractMap[K, W] with DefaultMap[K, W]
    Attributes
    protected
    Definition Classes
    MapLike
  5. class WithFilter extends FilterMonadic[A, Repr]

    A class supporting filtered operations.

    A class supporting filtered operations. Instances of this class are returned by method withFilter.

    Definition Classes
    TraversableLike
  6. type Entry = DefaultEntry[A, B]
  7. type Self = HashMap[A, B]

    The type implementing this traversable

    The type implementing this traversable

    Attributes
    protected[this]
    Definition Classes
    TraversableLike

Value Members

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

    Test two objects for inequality.

    Test two objects for inequality.

    returns

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

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

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

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

    returns

    a hash value consistent with ==

    Definition Classes
    AnyRef → Any
  3. def +[V1 >: B](elem1: (A, V1), elem2: (A, V1), elems: (A, V1)*): Map[A, V1]

    Creates a new map containing two or more key/value mappings and all the key/value mappings of this map.

    Creates a new map containing two or more key/value mappings and all the key/value mappings of this map.

    Specified mappings will override existing mappings from this map with the same keys.

    V1

    the type of the added values

    elem1

    the first element to add.

    elem2

    the second element to add.

    elems

    the remaining elements to add.

    returns

    a new map containing mappings of this map and two or more specified mappings.

    Definition Classes
    MapLikeMapLike
    Annotations
    @migration
    Migration

    (Changed in version 2.8.0) + creates a new map. Use += to add an element to this map and return that map itself.

  4. def +[V1 >: B](kv: (A, V1)): Map[A, V1]

    Creates a new map containing a new key/value mapping and all the key/value mappings of this map.

    Creates a new map containing a new key/value mapping and all the key/value mappings of this map.

    Mapping kv will override existing mappings from this map with the same key.

    V1

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

    kv

    the key/value mapping to be added

    returns

    a new map containing mappings of this map and the mapping kv.

    Definition Classes
    MapLikeMapLikeGenMapLike
    Annotations
    @migration
    Migration

    (Changed in version 2.8.0) + creates a new map. Use += to add an element to this map and return that map itself.

  5. def ++[V1 >: B](xs: GenTraversableOnce[(A, V1)]): Map[A, V1]

    Creates a new map containing the key/value mappings provided by the specified traversable object and all the key/value mappings of this map.

    Creates a new map containing the key/value mappings provided by the specified traversable object and all the key/value mappings of this map.

    Note that existing mappings from this map with the same key as those in xs will be overridden.

    V1

    the type of the added values

    xs

    the traversable object.

    returns

    a new map containing mappings of this map and those provided by xs.

    Definition Classes
    MapLikeMapLike
    Annotations
    @migration
    Migration

    (Changed in version 2.8.0) ++ creates a new map. Use ++= to add an element to this map and return that map itself.

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

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

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

    B

    the element type of the returned collection.

    That

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

    that

    the traversable to append.

    bf

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

    returns

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

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

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

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

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

    Example:

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

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

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

    B

    the element type of the returned collection.

    That

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

    that

    the traversable to append.

    bf

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

    returns

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

    Definition Classes
    TraversableLike
  8. def ++:[B](that: TraversableOnce[B]): HashMap[B]

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

    [use case]

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

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

    Example:

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

    the element type of the returned collection.

    that

    the traversable to append.

    returns

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

    Definition Classes
    TraversableLike
    Full Signature

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

  9. def ++=(xs: TraversableOnce[(A, B)]): HashMap.this.type

    adds all elements produced by a TraversableOnce to this growable collection.

    adds all elements produced by a TraversableOnce to this growable collection.

    xs

    the TraversableOnce producing the elements to add.

    returns

    the growable collection itself.

    Definition Classes
    Growable
  10. def +=(kv: (A, B)): HashMap.this.type

    Adds a new key/value pair to this map.

    Adds a new key/value pair to this map. If the map already contains a mapping for the key, it will be overridden by the new value.

    kv

    the key/value pair.

    returns

    the map itself

    Definition Classes
    HashMapMapLikeBuilderGrowable
  11. def +=(elem1: (A, B), elem2: (A, B), elems: (A, B)*): HashMap.this.type

    adds two or more elements to this growable collection.

    adds two or more elements to this growable collection.

    elem1

    the first element to add.

    elem2

    the second element to add.

    elems

    the remaining elements to add.

    returns

    the growable collection itself

    Definition Classes
    Growable
  12. def -(elem1: A, elem2: A, elems: A*): HashMap[A, B]

    Creates a new map with all the key/value mappings of this map except mappings with keys equal to any of the two or more specified keys.

    Creates a new map with all the key/value mappings of this map except mappings with keys equal to any of the two or more specified keys.

    elem1

    the first element to remove.

    elem2

    the second element to remove.

    elems

    the remaining elements to remove.

    returns

    a new map containing all the mappings of this map except mappings with a key equal to elem1, elem2 or any of elems.

    Definition Classes
    MapLikeSubtractable
    Annotations
    @migration
    Migration

    (Changed in version 2.8.0) - creates a new map. Use -= to remove an element from this map and return that map itself.

  13. def -(key: A): HashMap[A, B]

    Creates a new map with all the key/value mappings of this map except the key/value mapping with the specified key.

    Creates a new map with all the key/value mappings of this map except the key/value mapping with the specified key.

    key

    the key to be removed

    returns

    a new map with all the mappings of this map except that with a key key.

    Definition Classes
    MapLikeMapLikeSubtractableGenMapLike
    Annotations
    @migration
    Migration

    (Changed in version 2.8.0) - creates a new map. Use -= to remove an element from this map and return that map itself.

  14. def --(xs: GenTraversableOnce[A]): HashMap[A, B]

    Creates a new map with all the key/value mappings of this map except mappings with keys equal to any of those provided by the specified traversable object.

    Creates a new map with all the key/value mappings of this map except mappings with keys equal to any of those provided by the specified traversable object.

    xs

    the traversable object.

    returns

    a new map with all the key/value mappings of this map except mappings with a key equal to a key from xs.

    Definition Classes
    MapLikeSubtractable
    Annotations
    @migration
    Migration

    (Changed in version 2.8.0) -- creates a new map. Use --= to remove an element from this map and return that map itself.

  15. def --=(xs: TraversableOnce[A]): HashMap.this.type

    Removes all elements produced by an iterator from this shrinkable collection.

    Removes all elements produced by an iterator from this shrinkable collection.

    xs

    the iterator producing the elements to remove.

    returns

    the shrinkable collection itself

    Definition Classes
    Shrinkable
  16. def -=(key: A): HashMap.this.type

    Removes a key from this map.

    Removes a key from this map.

    key

    the key to be removed

    returns

    the map itself.

    Definition Classes
    HashMapMapLikeShrinkable
  17. def -=(elem1: A, elem2: A, elems: A*): HashMap.this.type

    Removes two or more elements from this shrinkable collection.

    Removes two or more elements from this shrinkable collection.

    elem1

    the first element to remove.

    elem2

    the second element to remove.

    elems

    the remaining elements to remove.

    returns

    the shrinkable collection itself

    Definition Classes
    Shrinkable
  18. def ->[B](y: B): (HashMap[A, B], B)
    Implicit
    This member is added by an implicit conversion from HashMap[A, B] to ArrowAssoc[HashMap[A, B]] performed by method ArrowAssoc in scala.Predef.
    Definition Classes
    ArrowAssoc
    Annotations
    @inline()
  19. def /:[B](z: B)(op: (B, (A, B)) ⇒ B): B

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

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

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

    Examples:

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

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

    Note: 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 traversable or iterator, going left to right with the start value z on the left:

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

    where x1, ..., xn are the elements of this traversable or iterator.

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

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

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

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

    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.

    Examples:

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

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

    the result type of the binary operator.

    z

    the start value

    op

    the binary operator

    returns

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

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

    where x1, ..., xn are the elements of this traversable or iterator.

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

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

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

    returns

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

    Definition Classes
    AnyRef → Any
  22. val _loadFactor: Int
    Attributes
    protected
    Definition Classes
    HashTable
    Annotations
    @transient()
  23. def addEntry(e: DefaultEntry[A, B]): Unit

    Add entry to table pre: no entry with same key exists

    Add entry to table pre: no entry with same key exists

    Attributes
    protected
    Definition Classes
    HashTable
    Annotations
    @deprecatedOverriding( message = ... , since = "2.11.0" )
  24. def addString(b: scala.StringBuilder, start: String, sep: String, end: String): scala.StringBuilder

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

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

    b

    the builder to which strings are appended.

    start

    the starting string.

    sep

    the separator string.

    end

    the ending string.

    returns

    the string builder b to which elements were appended.

    Definition Classes
    MapLikeTraversableOnce
  25. def addString(b: scala.StringBuilder): scala.StringBuilder

    Appends all elements of this traversable or iterator to a string builder.

    Appends all elements of this traversable or iterator to a string builder. The written text consists of the string representations (w.r.t. the method toString) of all elements of this traversable or iterator 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
    TraversableOnce
  26. def addString(b: scala.StringBuilder, sep: String): scala.StringBuilder

    Appends all elements of this traversable or iterator to a string builder using a separator string.

    Appends all elements of this traversable or iterator 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 traversable or iterator, 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
    TraversableOnce
  27. def aggregate[B](z: ⇒ B)(seqop: (B, (A, B)) ⇒ B, combop: (B, B) ⇒ B): B

    Aggregates the results of applying an operator to subsequent elements.

    Aggregates the results of applying an operator to subsequent elements.

    This is a more general form of fold and reduce. It is similar to foldLeft in that it doesn't require the result to be a supertype of the element type. In addition, it allows parallel collections to be processed in chunks, and then combines the intermediate results.

    aggregate splits the traversable or iterator into partitions and processes each partition by sequentially applying seqop, starting with z (like foldLeft). Those intermediate results are then combined by using combop (like fold). The implementation of this operation may operate on an arbitrary number of collection partitions (even 1), so combop may be invoked an arbitrary number of times (even 0).

    As an example, consider summing up the integer values of a list of chars. The initial value for the sum is 0. First, seqop transforms each input character to an Int and adds it to the sum (of the partition). Then, combop just needs to sum up the intermediate results of the partitions:

    List('a', 'b', 'c').aggregate(0)({ (sum, ch) => sum + ch.toInt }, { (p1, p2) => p1 + p2 })
    B

    the type of accumulated results

    z

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

    seqop

    an operator used to accumulate results within a partition

    combop

    an associative operator used to combine results from different partitions

    Definition Classes
    TraversableOnceGenTraversableOnce
  28. def alwaysInitSizeMap: Boolean
    Attributes
    protected
    Definition Classes
    HashTable
  29. def andThen[C](k: (B) ⇒ C): PartialFunction[A, C]

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

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

    C

    the result type of the transformation function.

    k

    the transformation function

    returns

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

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

    Retrieves the value which is associated with the given key.

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

    key

    the key

    returns

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

    Definition Classes
    HashMapMapLikeFunction1GenMapLike
  31. def applyOrElse[K1 <: A, V1 >: B](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
    MapLikePartialFunction
    Since

    2.10

  32. final def asInstanceOf[T0]: T0

    Cast the receiver object to be of type T0.

    Cast the receiver object to be of type T0.

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

    returns

    the receiver object.

    Definition Classes
    Any
    Exceptions thrown

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

  33. def calcSizeMapSize(tableLength: Int): Int
    Attributes
    protected
    Definition Classes
    HashTable
    Annotations
    @deprecatedOverriding( message = ... , since = "2.11.0" )
  34. def canEqual(that: Any): Boolean

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

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

    that

    The object with which this iterable collection should be compared

    returns

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

    Definition Classes
    IterableLikeEquals
  35. def clear(): Unit

    Removes all bindings from the map.

    Removes all bindings from the map. After this operation has completed, the map will be empty.

    Definition Classes
    HashMapMapLikeBuilderGrowableClearable
  36. def clearTable(): Unit

    Remove all entries from table

    Remove all entries from table

    Attributes
    protected
    Definition Classes
    HashTable
  37. def clone(): HashMap[A, B]

    Create a copy of the receiver object.

    Create a copy of the receiver object.

    The default implementation of the clone method is platform dependent.

    returns

    a copy of the receiver object.

    Definition Classes
    MapLikeCloneable → AnyRef
    Note

    not specified by SLS as a member of AnyRef

  38. def collect[B](pf: PartialFunction[A, B]): HashMap[B]

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

    [use case]

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

    B

    the element type of the returned collection.

    pf

    the partial function which filters and maps the mutable hash map.

    returns

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

    Definition Classes
    TraversableLikeGenTraversableLike
    Full Signature

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

  39. def collectFirst[B](pf: PartialFunction[(A, B), B]): Option[B]

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

    Finds the first element of the traversable or iterator 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
    TraversableOnce
    Example:
    1. Seq("a", 1, 5L).collectFirst({ case x: Int => x*10 }) = Some(10)

  40. def companion: GenericCompanion[Iterable]

    The factory companion object that builds instances of class Iterable.

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

    Definition Classes
    IterableIterableGenIterableTraversableTraversableGenTraversableGenericTraversableTemplate
  41. def compose[A](g: (A) ⇒ A): (A) ⇒ B

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

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

    A

    the type to which function g can be applied

    g

    a function A => T1

    returns

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

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

    Tests whether this map contains a binding for a key.

    Tests whether this map contains a binding for a key.

    key

    the key

    returns

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

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

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

    [use case]

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

    xs

    the array to fill.

    start

    the starting index.

    len

    the maximal number of elements to copy.

    Definition Classes
    IterableLikeTraversableLikeTraversableOnceGenTraversableOnce
    Full Signature

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

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

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

    [use case]

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

    xs

    the array to fill.

    Definition Classes
    TraversableOnceGenTraversableOnce
    Full Signature

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

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

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

    [use case]

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

    xs

    the array to fill.

    start

    the starting index.

    Definition Classes
    TraversableOnceGenTraversableOnce
    Full Signature

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

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

    Copies all elements of this traversable or iterator to a buffer.

    Copies all elements of this traversable or iterator to a buffer.

    Note: will not terminate for infinite-sized collections.

    dest

    The buffer to which elements are copied.

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

    Counts the number of elements in the traversable or iterator which satisfy a predicate.

    Counts the number of elements in the traversable or iterator which satisfy a predicate.

    p

    the predicate used to test elements.

    returns

    the number of elements satisfying the predicate p.

    Definition Classes
    TraversableOnceGenTraversableOnce
  48. def createNewEntry[B1](key: A, value: B1): Entry

    Creates new entry to be immediately inserted into the hashtable.

    Creates new entry to be immediately inserted into the hashtable. This method is guaranteed to be called only once and in case that the entry will be added. In other words, an implementation may be side-effecting.

    Attributes
    protected
    Definition Classes
    HashMapHashTable
  49. def default(key: A): B

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

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

    key

    the given key value for which a binding is missing.

    Definition Classes
    MapLikeGenMapLike
    Exceptions thrown
  50. def drop(n: Int): HashMap[A, B]

    Selects all elements except first n ones.

    Selects all elements except first n ones.

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

    n

    the number of elements to drop from this iterable collection.

    returns

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

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

    Selects all elements except last n ones.

    Selects all elements except last n ones.

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

    n

    The number of elements to take

    returns

    a iterable collection consisting of all elements of this iterable collection except the last n ones, or else the empty iterable collection, if this iterable collection has less than n elements.

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

    Drops longest prefix of elements that satisfy a predicate.

    Drops longest prefix of elements that satisfy a predicate.

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

    returns

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

    Definition Classes
    TraversableLikeGenTraversableLike
  53. def elemEquals(key1: A, key2: A): Boolean
    Attributes
    protected
    Definition Classes
    HashTable
  54. def elemHashCode(key: A): Int
    Attributes
    protected
    Definition Classes
    HashUtils
  55. def empty: HashMap[A, B]

    The empty map of the same type as this map

    The empty map of the same type as this map

    returns

    an empty map of type This.

    Definition Classes
    HashMapMapMapMapLike
  56. def ensuring(cond: (HashMap[A, B]) ⇒ Boolean, msg: ⇒ Any): HashMap[A, B]
    Implicit
    This member is added by an implicit conversion from HashMap[A, B] to Ensuring[HashMap[A, B]] performed by method Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  57. def ensuring(cond: (HashMap[A, B]) ⇒ Boolean): HashMap[A, B]
    Implicit
    This member is added by an implicit conversion from HashMap[A, B] to Ensuring[HashMap[A, B]] performed by method Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  58. def ensuring(cond: Boolean, msg: ⇒ Any): HashMap[A, B]
    Implicit
    This member is added by an implicit conversion from HashMap[A, B] to Ensuring[HashMap[A, B]] performed by method Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  59. def ensuring(cond: Boolean): HashMap[A, B]
    Implicit
    This member is added by an implicit conversion from HashMap[A, B] to Ensuring[HashMap[A, B]] performed by method Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  60. def entriesIterator: Iterator[DefaultEntry[A, B]]

    An iterator returning all entries.

    An iterator returning all entries.

    Attributes
    protected
    Definition Classes
    HashTable
  61. final def eq(arg0: AnyRef): Boolean

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

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

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

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

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

    returns

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

    Definition Classes
    AnyRef
  62. def equals(that: Any): Boolean

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

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

    that

    the other map

    returns

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

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

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

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

    Note: may not terminate for infinite-sized collections.

    p

    the predicate used to test elements.

    returns

    false if this iterable collection is empty, otherwise true if the given predicate p holds for some of the elements of this iterable collection, otherwise false

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

    Selects all elements of this traversable collection which satisfy a predicate.

    Selects all elements of this traversable collection which satisfy a predicate.

    p

    the predicate used to test elements.

    returns

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

    Definition Classes
    TraversableLikeGenTraversableLike
  65. def filterKeys(p: (A) ⇒ Boolean): collection.Map[A, B]

    Filters this map by retaining only keys satisfying a predicate.

    Filters this map by retaining only keys satisfying a predicate.

    Note: the predicate must accept any key of type K, not just those already present in the map, as the predicate is tested before the underlying map is queried.

    p

    the predicate used to test keys

    returns

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

    Definition Classes
    MapLikeGenMapLike
  66. def filterNot(p: ((A, B)) ⇒ Boolean): HashMap[A, B]

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

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

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

    p

    A predicate over key-value pairs

    returns

    A new map containing elements not satisfying the predicate.

    Definition Classes
    MapLikeTraversableLikeGenTraversableLike
  67. def finalize(): Unit

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

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

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

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

    not specified by SLS as a member of AnyRef

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

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

    Finds the first element of the iterable collection 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 iterable collection that satisfies p, or None if none exists.

    Definition Classes
    IterableLikeTraversableLikeTraversableOnceGenTraversableOnce
  69. def findEntry(key: A): DefaultEntry[A, B]

    Find entry with given key in table, null if not found.

    Find entry with given key in table, null if not found.

    Attributes
    protected
    Definition Classes
    HashTable
    Annotations
    @deprecatedOverriding( message = ... , since = "2.11.0" )
  70. def findOrAddEntry[B](key: A, value: B): DefaultEntry[A, B]

    Find entry with given key in table, or add new one if not found.

    Find entry with given key in table, or add new one if not found. May be somewhat faster then findEntry/addEntry pair as it computes entry's hash index only once. Returns entry found in table or null. New entries are created by calling createNewEntry method.

    Attributes
    protected
    Definition Classes
    HashTable
  71. def flatMap[B](f: (A) ⇒ GenTraversableOnce[B]): HashMap[B]

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

    [use case]

    Builds a new collection by applying a function to all elements of this mutable hash 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 mutable hash map. This might cause unexpected results sometimes. For example:

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

    the element type of the returned collection.

    f

    the function to apply to each element.

    returns

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

    Definition Classes
    TraversableLikeGenTraversableLikeFilterMonadic
    Full Signature

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

  72. def flatten[B]: HashMap[B]

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

    [use case]

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

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

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

    the type of the elements of each traversable collection.

    returns

    a new mutable hash map resulting from concatenating all element mutable hash maps.

    Definition Classes
    GenericTraversableTemplate
    Full Signature

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

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

    Folds the elements of this traversable or iterator using the specified associative binary operator.

    Folds the elements of this traversable or iterator using the specified associative binary operator.

    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 traversable or iterator is empty.

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

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

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

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

    where x1, ..., xn are the elements of this traversable or iterator. Returns z if this traversable or iterator is empty.

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

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

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

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

    where x1, ..., xn are the elements of this iterable collection. Returns z if this iterable collection is empty.

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

    Tests whether a predicate holds for all elements of this iterable collection.

    Tests whether a predicate holds for all elements of this iterable collection.

    Note: may not terminate for infinite-sized collections.

    p

    the predicate used to test elements.

    returns

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

    Definition Classes
    IterableLikeTraversableLikeTraversableOnceGenTraversableOnce
  77. def foreach(f: (A) ⇒ Unit): Unit

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

    [use case]

    Applies a function f to all elements of this mutable hash map.

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

    f

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

    Definition Classes
    HashMapIterableLikeGenericTraversableTemplateTraversableLikeGenTraversableLikeTraversableOnceGenTraversableOnceFilterMonadic
    Full Signature

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

  78. def foreachEntry[U](f: (DefaultEntry[A, B]) ⇒ U): Unit

    Avoid iterator for a 2x faster traversal.

    Avoid iterator for a 2x faster traversal.

    Attributes
    protected
    Definition Classes
    HashTable
  79. def formatted(fmtstr: String): String

    Returns string formatted according to given format string.

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

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

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

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

    Definition Classes
    GenericTraversableTemplate
  81. def get(key: A): Option[B]

    Optionally returns the value associated with a key.

    Optionally returns the value associated with a key.

    key

    the key value

    returns

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

    Definition Classes
    HashMapMapLikeGenMapLike
  82. final def getClass(): Class[_]

    Returns the runtime class representation of the object.

    Returns the runtime class representation of the object.

    returns

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

    Definition Classes
    AnyRef → Any
    Annotations
    @native()
  83. def getOrElse(key: A, default: ⇒ B): B

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

    [use case]

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

    key

    the key.

    default

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

    returns

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

    Definition Classes
    MapLikeGenMapLike
    Full Signature

    def getOrElse[V1 >: B](key: A, default: ⇒ V1): V1

  84. def getOrElseUpdate(key: A, defaultValue: ⇒ B): B

    If given key is already in this map, returns associated value.

    If given key is already in this map, returns associated value.

    Otherwise, computes value from given expression op, stores with key in map and returns that value.

    Concurrent map implementations may evaluate the expression op multiple times, or may evaluate op without inserting the result.

    key

    the key to test

    returns

    the value associated with key (either previously or as a result of executing the method).

    Definition Classes
    HashMapMapLike
  85. def groupBy[K](f: ((A, B)) ⇒ K): immutable.Map[K, HashMap[A, B]]

    Partitions this traversable collection into a map of traversable collections according to some discriminator function.

    Partitions this traversable collection into a map of traversable collections according to some discriminator function.

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

    K

    the type of keys returned by the discriminator function.

    f

    the discriminator function.

    returns

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

    Definition Classes
    TraversableLikeGenTraversableLike
  86. def grouped(size: Int): Iterator[HashMap[A, B]]

    Partitions elements in fixed size iterable collections.

    Partitions elements in fixed size iterable collections.

    size

    the number of elements per group

    returns

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

    Definition Classes
    IterableLike
    See also

    scala.collection.Iterator, method grouped

  87. def hasDefiniteSize: Boolean

    Tests whether this traversable collection is known to have a finite size.

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

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

    returns

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

    Definition Classes
    TraversableLikeTraversableOnceGenTraversableOnce
  88. def hashCode(): Int

    The hashCode method for reference types.

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

    returns

    the hash code value for this object.

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

    Selects the first element of this iterable collection.

    Selects the first element of this iterable collection.

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

    returns

    the first element of this iterable collection.

    Definition Classes
    IterableLikeTraversableLikeGenTraversableLike
    Exceptions thrown

    NoSuchElementException if the iterable collection is empty.

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

    Optionally selects the first element.

    Optionally selects the first element.

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

    returns

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

    Definition Classes
    TraversableLikeGenTraversableLike
  91. final def improve(hcode: Int, seed: Int): Int

    Defer to a high-quality hash in scala.util.hashing.

    Defer to a high-quality hash in scala.util.hashing. The goal is to distribute across bins as well as possible even if a hash code has low entropy at some bits.

    OLD VERSION - quick, but bad for sequence 0-10000 - little entropy in higher bits - since 2003

    var h: Int = hcode + ~(hcode << 9)
    h = h ^ (h >>> 14)
    h = h + (h << 4)
    h ^ (h >>> 10)

    the rest of the computation is due to scala/bug#5293

    Attributes
    protected
    Definition Classes
    HashUtils
  92. final def index(hcode: Int): Int

    Note: we take the most significant bits of the hashcode, not the lower ones this is of crucial importance when populating the table in parallel

    Note: we take the most significant bits of the hashcode, not the lower ones this is of crucial importance when populating the table in parallel

    Attributes
    protected
    Definition Classes
    HashTable
  93. def init: HashMap[A, B]

    Selects all elements except the last.

    Selects all elements except the last.

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

    returns

    a traversable collection consisting of all elements of this traversable collection except the last one.

    Definition Classes
    TraversableLikeGenTraversableLike
    Exceptions thrown

    UnsupportedOperationException if the traversable collection is empty.

  94. def initWithContents(c: Contents[A, DefaultEntry[A, B]]): Unit
    Attributes
    protected
    Definition Classes
    HashTable
  95. def initialSize: Int

    The initial size of the hash table.

    The initial size of the hash table.

    Attributes
    protected
    Definition Classes
    HashTable
  96. def inits: Iterator[HashMap[A, B]]

    Iterates over the inits of this traversable collection.

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

    returns

    an iterator over all the inits of this traversable collection

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

  97. def isDefinedAt(key: A): Boolean

    Tests whether this map contains a binding for a key.

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

    key

    the key

    returns

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

    Definition Classes
    MapLikeGenMapLikePartialFunction
  98. def isEmpty: Boolean

    Tests whether the map is empty.

    Tests whether the map is empty.

    returns

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

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

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

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

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

    returns

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

    Definition Classes
    Any
  100. def isSizeMapDefined: Boolean
    Attributes
    protected
    Definition Classes
    HashTable
    Annotations
    @deprecatedOverriding( message = ... , since = "2.11.0" )
  101. final def isTraversableAgain: Boolean

    Tests whether this traversable collection can be repeatedly traversed.

    Tests whether this traversable collection can be repeatedly traversed.

    returns

    true

    Definition Classes
    TraversableLikeGenTraversableLikeGenTraversableOnce
  102. def iterator: Iterator[(A, B)]

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

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

    returns

    the new iterator

    Definition Classes
    HashMapMapLikeIterableLikeGenIterableLike
  103. def keySet: collection.Set[A]

    Collects all keys of this map in a set.

    Collects all keys of this map in a set.

    returns

    a set containing all keys of this map.

    Definition Classes
    HashMapMapLikeGenMapLike
  104. def keys: collection.Iterable[A]

    Collects all keys of this map in an iterable collection.

    Collects all keys of this map in an iterable collection.

    returns

    the keys of this map as an iterable.

    Definition Classes
    MapLikeGenMapLike
    Annotations
    @migration
    Migration

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

  105. def keysIterator: Iterator[A]

    Creates an iterator for all keys.

    Creates an iterator for all keys.

    returns

    an iterator over all keys.

    Definition Classes
    HashMapMapLikeGenMapLike
  106. def last: (A, B)

    Selects the last element.

    Selects the last element.

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

    returns

    The last element of this traversable collection.

    Definition Classes
    TraversableLikeGenTraversableLike
    Exceptions thrown

    NoSuchElementException If the traversable collection is empty.

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

    Optionally selects the last element.

    Optionally selects the last element.

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

    returns

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

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

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

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

    returns

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

    Definition Classes
    PartialFunction
    See also

    Function.unlift

  109. def map[B](f: (A) ⇒ B): HashMap[B]

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

    [use case]

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

    B

    the element type of the returned collection.

    f

    the function to apply to each element.

    returns

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

    Definition Classes
    TraversableLikeGenTraversableLikeFilterMonadic
    Full Signature

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

  110. def mapResult[NewTo](f: (HashMap[A, B]) ⇒ NewTo): Builder[(A, B), NewTo]

    Creates a new builder by applying a transformation function to the results of this builder.

    Creates a new builder by applying a transformation function to the results of this builder.

    NewTo

    the type of collection returned by f.

    f

    the transformation function.

    returns

    a new builder which is the same as the current builder except that a transformation function is applied to this builder's result.

    Definition Classes
    Builder
    Note

    The original builder should no longer be used after mapResult is called.

  111. def mapValues[W](f: (B) ⇒ W): collection.Map[A, 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
    MapLikeGenMapLike
  112. def max: A

    [use case] Finds the largest element.

    [use case]

    Finds the largest element.

    returns

    the largest element of this mutable hash map.

    Definition Classes
    TraversableOnceGenTraversableOnce
    Full Signature

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

    Exceptions thrown

    UnsupportedOperationException if this mutable hash map is empty.

  113. def maxBy[B](f: (A) ⇒ B): A

    [use case] Finds the first element which yields the largest value measured by function f.

    [use case]

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

    B

    The result type of the function f.

    f

    The measuring function.

    returns

    the first element of this mutable hash map with the largest value measured by function f.

    Definition Classes
    TraversableOnceGenTraversableOnce
    Full Signature

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

    Exceptions thrown

    UnsupportedOperationException if this mutable hash map is empty.

  114. def min: A

    [use case] Finds the smallest element.

    [use case]

    Finds the smallest element.

    returns

    the smallest element of this mutable hash map

    Definition Classes
    TraversableOnceGenTraversableOnce
    Full Signature

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

    Exceptions thrown

    UnsupportedOperationException if this mutable hash map is empty.

  115. def minBy[B](f: (A) ⇒ B): A

    [use case] Finds the first element which yields the smallest value measured by function f.

    [use case]

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

    B

    The result type of the function f.

    f

    The measuring function.

    returns

    the first element of this mutable hash map with the smallest value measured by function f.

    Definition Classes
    TraversableOnceGenTraversableOnce
    Full Signature

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

    Exceptions thrown

    UnsupportedOperationException if this mutable hash map is empty.

  116. def mkString: String

    Displays all elements of this traversable or iterator in a string.

    Displays all elements of this traversable or iterator in a string.

    returns

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

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

    Displays all elements of this traversable or iterator in a string using a separator string.

    Displays all elements of this traversable or iterator in a string using a separator string.

    sep

    the separator string.

    returns

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

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

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

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

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

    start

    the starting string.

    sep

    the separator string.

    end

    the ending string.

    returns

    a string representation of this traversable or iterator. 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 traversable or iterator are separated by the string sep.

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

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

    Equivalent to !(this eq that).

    Equivalent to !(this eq that).

    returns

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

    Definition Classes
    AnyRef
  120. def newBuilder: Builder[(A, B), HashMap[A, B]]

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

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

    Overrides MapLike implementation for better efficiency.

    Attributes
    protected[this]
    Definition Classes
    MapLikeMapLikeTraversableLikeHasNewBuilder
  121. def nnSizeMapAdd(h: Int): Unit
    Attributes
    protected
    Definition Classes
    HashTable
    Annotations
    @deprecatedOverriding( message = ... , since = "2.11.0" )
  122. def nnSizeMapRemove(h: Int): Unit
    Attributes
    protected
    Definition Classes
    HashTable
    Annotations
    @deprecatedOverriding( message = ... , since = "2.11.0" )
  123. def nnSizeMapReset(tableLength: Int): Unit
    Attributes
    protected
    Definition Classes
    HashTable
    Annotations
    @deprecatedOverriding( message = ... , since = "2.11.0" )
  124. def nonEmpty: Boolean

    Tests whether the traversable or iterator is not empty.

    Tests whether the traversable or iterator is not empty.

    returns

    true if the traversable or iterator contains at least one element, false otherwise.

    Definition Classes
    TraversableOnceGenTraversableOnce
  125. final def notify(): Unit

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

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

    Definition Classes
    AnyRef
    Annotations
    @native()
    Note

    not specified by SLS as a member of AnyRef

  126. final def notifyAll(): Unit

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

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

    Definition Classes
    AnyRef
    Annotations
    @native()
    Note

    not specified by SLS as a member of AnyRef

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

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

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

    A1

    the argument type of the fallback function

    B1

    the result type of the fallback function

    that

    the fallback function

    returns

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

    Definition Classes
    PartialFunction
  128. def par: ParHashMap[A, B]

    Returns a parallel implementation of this collection.

    Returns a parallel implementation of this collection.

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

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

    All parallel collections return a reference to themselves.

    returns

    a parallel implementation of this collection

    Definition Classes
    HashMapCustomParallelizableParallelizable
  129. def parCombiner: Combiner[(A, B), ParHashMap[A, B]]

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

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

    returns

    a combiner for the parallel collection of type ParRepr

    Attributes
    protected[this]
    Definition Classes
    CustomParallelizableParallelizable
  130. def partition(p: ((A, B)) ⇒ Boolean): (HashMap[A, B], HashMap[A, B])

    Partitions this traversable collection in two traversable collections according to a predicate.

    Partitions this traversable collection in two traversable collections according to a predicate.

    p

    the predicate on which to partition.

    returns

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

    Definition Classes
    TraversableLikeGenTraversableLike
  131. def product: A

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

    [use case]

    Multiplies up the elements of this collection.

    returns

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

    Definition Classes
    TraversableOnceGenTraversableOnce
    Full Signature

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

  132. def put(key: A, value: B): Option[B]

    Adds a new key/value pair to this map and optionally returns previously bound value.

    Adds a new key/value pair to this map and optionally returns previously bound value. If the map already contains a mapping for the key, it will be overridden by the new value.

    key

    the key to update

    value

    the new value

    returns

    an option value containing the value associated with the key before the put operation was executed, or None if key was not defined in the map before.

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

    Reduces the elements of this traversable or iterator using the specified associative binary operator.

    Reduces the elements of this traversable or iterator using the specified associative binary operator.

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

    A1

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

    op

    A binary operator that must be associative.

    returns

    The result of applying reduce operator op between all the elements if the traversable or iterator is nonempty.

    Definition Classes
    TraversableOnceGenTraversableOnce
    Exceptions thrown

    UnsupportedOperationException if this traversable or iterator is empty.

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

    Applies a binary operator to all elements of this traversable or iterator, going left to right.

    Applies a binary operator to all elements of this traversable or iterator, 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 traversable or iterator, going left to right:

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

    where x1, ..., xn are the elements of this traversable or iterator.

    Definition Classes
    TraversableOnce
    Exceptions thrown

    UnsupportedOperationException if this traversable or iterator is empty.

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

    Optionally applies a binary operator to all elements of this traversable or iterator, going left to right.

    Optionally applies a binary operator to all elements of this traversable or iterator, 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 traversable or iterator is nonempty, None otherwise.

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

    Reduces the elements of this traversable or iterator, if any, using the specified associative binary operator.

    Reduces the elements of this traversable or iterator, if any, using the specified associative binary operator.

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

    A1

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

    op

    A binary operator that must be associative.

    returns

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

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

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

    Applies a binary operator to all elements of this iterable collection, 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 iterable collection, going right to left:

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

    where x1, ..., xn are the elements of this iterable collection.

    Definition Classes
    IterableLikeTraversableOnceGenTraversableOnce
    Exceptions thrown

    UnsupportedOperationException if this iterable collection is empty.

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

    Optionally applies a binary operator to all elements of this traversable or iterator, going right to left.

    Optionally applies a binary operator to all elements of this traversable or iterator, 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 traversable or iterator is nonempty, None otherwise.

    Definition Classes
    TraversableOnceGenTraversableOnce
  139. def remove(key: A): Option[B]

    Removes a key from this map, returning the value associated previously with that key as an option.

    Removes a key from this map, returning the value associated previously with that key as an option.

    key

    the key to be removed

    returns

    an option value containing the value associated previously with key, or None if key was not defined in the map before.

    Definition Classes
    HashMapMapLike
  140. def removeEntry(key: A): DefaultEntry[A, B]

    Remove entry from table if present.

    Remove entry from table if present.

    Attributes
    protected
    Definition Classes
    HashTable
    Annotations
    @deprecatedOverriding( message = ... , since = "2.11.0" )
  141. def repr: HashMap[A, B]

    The collection of type traversable collection underlying this TraversableLike object.

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

    Definition Classes
    TraversableLikeGenTraversableLike
  142. def result(): HashMap[A, B]

    The result when this map is used as a builder

    The result when this map is used as a builder

    returns

    the map representation itself.

    Definition Classes
    MapLikeBuilder
  143. def retain(p: (A, B) ⇒ Boolean): HashMap.this.type

    Retains only those mappings for which the predicate p returns true.

    Retains only those mappings for which the predicate p returns true.

    p

    The test predicate

    Definition Classes
    MapLike
  144. def reversed: List[(A, B)]
    Attributes
    protected[this]
    Definition Classes
    TraversableOnce
  145. def runWith[U](action: (B) ⇒ U): (A) ⇒ Boolean

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

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

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

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

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

    action

    the action function

    returns

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

    Definition Classes
    PartialFunction
    Since

    2.10

    See also

    applyOrElse.

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

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

    [use case]

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

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

    that

    the collection to compare with.

    returns

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

    Definition Classes
    IterableLikeGenIterableLike
    Full Signature

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

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

    Computes a prefix scan of the elements of the collection.

    Computes a prefix scan of the elements of the collection.

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

    B

    element type of the resulting collection

    That

    type of the resulting collection

    z

    neutral element for the operator op

    op

    the associative operator for the scan

    cbf

    combiner factory which provides a combiner

    returns

    a new traversable collection containing the prefix scan of the elements in this traversable collection

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

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

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

    Note: 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

    That

    the actual type of the resulting collection

    z

    the initial value

    op

    the binary operator applied to the intermediate result and the element

    bf

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

    returns

    collection with intermediate results

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

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

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

    Note: will not terminate for infinite-sized collections.

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

    Example:

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

    the type of the elements in the resulting collection

    That

    the actual type of the resulting collection

    z

    the initial value

    op

    the binary operator applied to the intermediate result and the element

    bf

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

    returns

    collection with intermediate results

    Definition Classes
    TraversableLikeGenTraversableLike
    Annotations
    @migration
    Migration

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

  150. val seedvalue: Int
    Attributes
    protected
    Definition Classes
    HashTable
    Annotations
    @transient()
  151. def seq: Map[A, B]

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

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

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

    returns

    a sequential view of the collection.

    Definition Classes
    MapMapGenMapGenMapLikeIterableIterableGenIterableTraversableTraversableGenTraversableParallelizableTraversableOnceGenTraversableOnce
  152. def size: Int

    The size of this mutable hash map.

    The size of this mutable hash map.

    returns

    the number of elements in this mutable hash map.

    Definition Classes
    HashMapGenTraversableLikeTraversableOnceGenTraversableOnce
  153. def sizeHint(coll: TraversableLike[_, _], delta: Int): Unit

    Gives a hint that one expects the result of this builder to have the same size as the given collection, plus some delta.

    Gives a hint that one expects the result of this builder to have the same size as the given collection, plus some delta. This will provide a hint only if the collection is known to have a cheap size method. Currently this is assumed to be the case if and only if the collection is of type IndexedSeqLike. Some builder classes will optimize their representation based on the hint. However, builder implementations are still required to work correctly even if the hint is wrong, i.e. a different number of elements is added.

    coll

    the collection which serves as a hint for the result's size.

    delta

    a correction to add to the coll.size to produce the size hint.

    Definition Classes
    Builder
  154. def sizeHint(coll: TraversableLike[_, _]): Unit

    Gives a hint that one expects the result of this builder to have the same size as the given collection, plus some delta.

    Gives a hint that one expects the result of this builder to have the same size as the given collection, plus some delta. This will provide a hint only if the collection is known to have a cheap size method, which is determined by calling sizeHint.

    Some builder classes will optimize their representation based on the hint. However, builder implementations are still required to work correctly even if the hint is wrong, i.e. a different number of elements is added.

    coll

    the collection which serves as a hint for the result's size.

    Definition Classes
    Builder
  155. def sizeHint(size: Int): Unit

    Gives a hint how many elements are expected to be added when the next result is called.

    Gives a hint how many elements are expected to be added when the next result is called. Some builder classes will optimize their representation based on the hint. However, builder implementations are still required to work correctly even if the hint is wrong, i.e. a different number of elements is added.

    size

    the hint how many elements will be added.

    Definition Classes
    Builder
  156. def sizeHintBounded(size: Int, boundingColl: TraversableLike[_, _]): Unit

    Gives a hint how many elements are expected to be added when the next result is called, together with an upper bound given by the size of some other collection.

    Gives a hint how many elements are expected to be added when the next result is called, together with an upper bound given by the size of some other collection. Some builder classes will optimize their representation based on the hint. However, builder implementations are still required to work correctly even if the hint is wrong, i.e. a different number of elements is added.

    size

    the hint how many elements will be added.

    boundingColl

    the bounding collection. If it is an IndexedSeqLike, then sizes larger than collection's size are reduced.

    Definition Classes
    Builder
  157. def sizeHintIfCheap: Int

    The size of this collection or iterator, if it can be cheaply computed

    The size of this collection or iterator, if it can be cheaply computed

    returns

    the number of elements in this collection or iterator, or -1 if the size cannot be determined cheaply

    Attributes
    protected[collection]
    Definition Classes
    GenTraversableOnce
  158. final def sizeMapBucketBitSize: Int
    Attributes
    protected
    Definition Classes
    HashUtils
  159. final def sizeMapBucketSize: Int
    Attributes
    protected
    Definition Classes
    HashUtils
  160. def sizeMapDisable(): Unit
    Attributes
    protected
    Definition Classes
    HashTable
    Annotations
    @deprecatedOverriding( message = ... , since = "2.11.0" )
  161. def sizeMapInit(tableLength: Int): Unit
    Attributes
    protected
    Definition Classes
    HashTable
  162. def sizeMapInitAndRebuild(): Unit
    Attributes
    protected
    Definition Classes
    HashTable
    Annotations
    @deprecatedOverriding( message = ... , since = "2.11.0" )
  163. val sizemap: Array[Int]

    The array keeping track of the number of elements in 32 element blocks.

    The array keeping track of the number of elements in 32 element blocks.

    Attributes
    protected
    Definition Classes
    HashTable
    Annotations
    @transient()
  164. def slice(from: Int, until: Int): HashMap[A, B]

    Selects an interval of elements.

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

    from <= indexOf(x) < until

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

    returns

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

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

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

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

    size

    the number of elements per group

    step

    the distance between the first elements of successive groups

    returns

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

    Definition Classes
    IterableLike
    See also

    scala.collection.Iterator, method sliding

  166. def sliding(size: Int): Iterator[HashMap[A, B]]

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

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

    size

    the number of elements per group

    returns

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

    Definition Classes
    IterableLike
    See also

    scala.collection.Iterator, method sliding

  167. def span(p: ((A, B)) ⇒ Boolean): (HashMap[A, B], HashMap[A, B])

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

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

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

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

    returns

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

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

    Splits this traversable collection into two at a given position.

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

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

    n

    the position at which to split.

    returns

    a pair of traversable collections consisting of the first n elements of this traversable collection, and the other elements.

    Definition Classes
    TraversableLikeGenTraversableLike
  169. def stringPrefix: String

    Defines the prefix of this object's toString representation.

    Defines the prefix of this object's toString representation.

    returns

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

    Definition Classes
    MapLikeTraversableLikeGenTraversableLike
  170. def sum: A

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

    [use case]

    Sums up the elements of this collection.

    returns

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

    Definition Classes
    TraversableOnceGenTraversableOnce
    Full Signature

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

  171. final def synchronized[T0](arg0: ⇒ T0): T0
    Definition Classes
    AnyRef
  172. val table: Array[HashEntry[A, DefaultEntry[A, B]]]

    The actual hash table.

    The actual hash table.

    Attributes
    protected
    Definition Classes
    HashTable
    Annotations
    @transient()
  173. val tableSize: Int

    The number of mappings contained in this hash table.

    The number of mappings contained in this hash table.

    Attributes
    protected
    Definition Classes
    HashTable
    Annotations
    @transient()
  174. def tableSizeSeed: Int
    Attributes
    protected
    Definition Classes
    HashTable
  175. def tail: HashMap[A, B]

    Selects all elements except the first.

    Selects all elements except the first.

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

    returns

    a traversable collection consisting of all elements of this traversable collection except the first one.

    Definition Classes
    TraversableLikeGenTraversableLike
    Exceptions thrown

    java.lang.UnsupportedOperationException if the traversable collection is empty.

  176. def tails: Iterator[HashMap[A, B]]

    Iterates over the tails of this traversable collection.

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

    returns

    an iterator over all the tails of this traversable collection

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

  177. def take(n: Int): HashMap[A, B]

    Selects first n elements.

    Selects first n elements.

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

    n

    the number of elements to take from this iterable collection.

    returns

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

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

    Selects last n elements.

    Selects last n elements.

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

    n

    the number of elements to take

    returns

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

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

    Takes longest prefix of elements that satisfy a predicate.

    Takes longest prefix of elements that satisfy a predicate.

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

    returns

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

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

    The underlying collection seen as an instance of Iterable.

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

    Attributes
    protected[this]
    Definition Classes
    IterableLikeTraversableLike
  181. val threshold: Int

    The next size value at which to resize (capacity * load factor).

    The next size value at which to resize (capacity * load factor).

    Attributes
    protected
    Definition Classes
    HashTable
    Annotations
    @transient()
  182. def to[Col[_]]: Col[A]

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

    [use case]

    Converts this mutable hash map into another by copying all elements.

    Col

    The collection type to build.

    returns

    a new collection containing all elements of this mutable hash map.

    Definition Classes
    TraversableLikeTraversableOnceGenTraversableOnce
    Full Signature

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

  183. def toArray: Array[A]

    [use case] Converts this mutable hash map to an array.

    [use case]

    Converts this mutable hash map to an array.

    returns

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

    Definition Classes
    TraversableOnceGenTraversableOnce
    Full Signature

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

  184. def toBuffer[E >: (A, B)]: Buffer[E]

    Uses the contents of this map to create a new mutable buffer.

    Uses the contents of this map to create a new mutable buffer.

    returns

    a buffer containing all elements of this map.

    Definition Classes
    MapLikeTraversableOnceGenTraversableOnce
  185. def toCollection(repr: HashMap[A, B]): collection.Iterable[(A, B)]

    A conversion from collections of type Repr to Iterable objects.

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

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

    Converts this traversable or iterator to an indexed sequence.

    Converts this traversable or iterator to an indexed sequence.

    Note: will not terminate for infinite-sized collections.

    returns

    an indexed sequence containing all elements of this traversable or iterator.

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

    Returns this iterable collection as an iterable collection.

    Returns this iterable collection as an iterable collection.

    A new collection will not be built; lazy collections will stay lazy.

    Note: will not terminate for infinite-sized collections.

    returns

    an Iterable containing all elements of this iterable collection.

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

    Returns an Iterator over the elements in this iterable collection.

    Returns an Iterator over the elements in this iterable collection. Produces the same result as iterator.

    Note: will not terminate for infinite-sized collections.

    returns

    an Iterator containing all elements of this iterable collection.

    Definition Classes
    IterableLikeTraversableLikeGenTraversableOnce
    Annotations
    @deprecatedOverriding( message = ... , since = "2.11.0" )
  189. def toList: List[(A, B)]

    Converts this traversable or iterator to a list.

    Converts this traversable or iterator to a list.

    Note: will not terminate for infinite-sized collections.

    returns

    a list containing all elements of this traversable or iterator.

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

    [use case] Converts this mutable hash map to a map.

    [use case]

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

    returns

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

    Definition Classes
    TraversableOnceGenTraversableOnce
    Full Signature

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

  191. def toParArray: ParArray[T]
    Implicit
    This member is added by an implicit conversion from HashMap[A, B] to CollectionsHaveToParArray[HashMap[A, B], T] performed by method CollectionsHaveToParArray in scala.collection.parallel. This conversion will take place only if an implicit value of type (HashMap[A, B]) ⇒ GenTraversableOnce[T] is in scope.
    Definition Classes
    CollectionsHaveToParArray
  192. def toSeq: collection.Seq[(A, B)]

    Converts this mutable map to a sequence.

    Converts this mutable map to a sequence.

    Note: assumes a fast size method. Subclasses should override if this is not true.

    returns

    a sequence containing all elements of this mutable map.

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

    Converts this traversable or iterator to a set.

    Converts this traversable or iterator to a set.

    Note: will not terminate for infinite-sized collections.

    returns

    a set containing all elements of this traversable or iterator.

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

    Converts this iterable collection to a stream.

    Converts this iterable collection to a stream.

    returns

    a stream containing all elements of this iterable collection.

    Definition Classes
    IterableLikeTraversableLikeGenTraversableOnce
  195. def toString(): String

    Converts this map to a string.

    Converts this map to a string.

    returns

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

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

    Converts this traversable collection to an unspecified Traversable.

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

    Note: will not terminate for infinite-sized collections.

    returns

    a Traversable containing all elements of this traversable collection.

    Definition Classes
    TraversableLikeTraversableOnceGenTraversableOnce
    Annotations
    @deprecatedOverriding( message = ... , since = "2.11.0" )
  197. def toVector: Vector[(A, B)]

    Converts this traversable or iterator to a Vector.

    Converts this traversable or iterator to a Vector.

    Note: will not terminate for infinite-sized collections.

    returns

    a vector containing all elements of this traversable or iterator.

    Definition Classes
    TraversableOnceGenTraversableOnce
  198. def transform(f: (A, B) ⇒ B): HashMap.this.type

    Applies a transformation function to all values contained in this map.

    Applies a transformation function to all values contained in this map. The transformation function produces new values from existing keys associated values.

    f

    the transformation to apply

    returns

    the map itself.

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

    Transposes this collection of traversable collections into a collection of collections.

    Transposes this collection of traversable collections into a collection of collections.

    The resulting collection's type will be guided by the static type of collection. 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))
    B

    the type of the elements of each traversable collection.

    asTraversable

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

    returns

    a two-dimensional collection of collections which has as nth row the nth column of this collection.

    Definition Classes
    GenericTraversableTemplate
    Annotations
    @migration
    Migration

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

    Exceptions thrown

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

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

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

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

    val xs = Traversable(
               (1, "one"),
               (2, "two"),
               (3, "three")).unzip
    // xs == (Traversable(1, 2, 3),
    //        Traversable(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 collection is a pair.

    returns

    a pair of collections, containing the first, respectively second half of each element pair of this collection.

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

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

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

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

    returns

    a triple of collections, containing the first, second, respectively third member of each element triple of this collection.

    Definition Classes
    GenericTraversableTemplate
  202. def update(key: A, value: B): Unit

    Adds a new key/value pair to this map.

    Adds a new key/value pair to this map. If the map already contains a mapping for the key, it will be overridden by the new value.

    key

    The key to update

    value

    The new value

    Definition Classes
    HashMapMapLike
  203. def updated[V1 >: B](key: A, value: V1): Map[A, V1]

    Creates a new map consisting of all key/value pairs of the current map plus a new pair of a given key and value.

    Creates a new map consisting of all key/value pairs of the current map plus a new pair of a given key and value.

    V1

    the type of the added value

    key

    The key to add

    value

    The new value

    returns

    A fresh immutable map with the binding from key to value added to this map.

    Definition Classes
    MapLikeMapLike
  204. def useSizeMap(t: Boolean): Unit

    Toggles whether a size map is used to track hash map statistics.

  205. def values: collection.Iterable[B]

    Collects all values of this map in an iterable collection.

    Collects all values of this map in an iterable collection.

    returns

    the values of this map as an iterable.

    Definition Classes
    HashMapMapLikeGenMapLike
  206. def valuesIterator: Iterator[B]

    Creates an iterator for all values in this map.

    Creates an iterator for all values in this map.

    returns

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

    Definition Classes
    HashMapMapLikeGenMapLike
  207. def view(from: Int, until: Int): IterableView[(A, B), HashMap[A, B]]

    Creates a non-strict view of a slice of this iterable collection.

    Creates a non-strict view of a slice of this iterable collection.

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

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

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

    from

    the index of the first element of the view

    until

    the index of the element following the view

    returns

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

    Definition Classes
    IterableLikeTraversableLike
  208. def view: IterableView[(A, B), HashMap[A, B]]

    Creates a non-strict view of this iterable collection.

    Creates a non-strict view of this iterable collection.

    returns

    a non-strict view of this iterable collection.

    Definition Classes
    IterableLikeTraversableLike
  209. final def wait(): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  210. final def wait(arg0: Long, arg1: Int): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  211. final def wait(arg0: Long): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws( ... ) @native()
  212. def withDefault(d: (A) ⇒ B): Map[A, B]

    The same map with a given default function.

    The same map with a given default function.

    Invoking transformer methods (e.g. map) will not preserve the default value.

    d

    the function mapping keys to values, used for non-present keys

    returns

    a wrapper of the map with a default value

    Definition Classes
    Map
  213. def withDefaultValue(d: B): Map[A, B]

    The same map with a given default value.

    The same map with a given default value.

    Invoking transformer methods (e.g. map) will not preserve the default value.

    d

    default value used for non-present keys

    returns

    a wrapper of the map with a default value

    Definition Classes
    Map
  214. def withFilter(p: ((A, B)) ⇒ Boolean): FilterMonadic[(A, B), HashMap[A, B]]

    Creates a non-strict filter of this traversable collection.

    Creates a non-strict filter of this traversable collection.

    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 traversable collection which satisfy the predicate p.

    Definition Classes
    TraversableLikeFilterMonadic
  215. def zip[B](that: GenIterable[B]): HashMap[(A, B)]

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

    [use case]

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

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

    B

    the type of the second half of the returned pairs

    that

    The iterable providing the second half of each result pair

    returns

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

    Definition Classes
    IterableLikeGenIterableLike
    Full Signature

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

  216. def zipAll[B](that: collection.Iterable[B], thisElem: A, thatElem: B): HashMap[(A, B)]

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

    [use case]

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

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

    B

    the type of the second half of the returned pairs

    that

    The iterable providing the second half of each result pair

    thisElem

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

    thatElem

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

    returns

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

    Definition Classes
    IterableLikeGenIterableLike
    Full Signature

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

  217. def zipWithIndex: HashMap[(A, Int)]

    [use case] Zips this mutable hash map with its indices.

    [use case]

    Zips this mutable hash map with its indices.

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

    returns

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

    Definition Classes
    IterableLikeGenIterableLike
    Full Signature

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

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

  218. def [B](y: B): (HashMap[A, B], B)
    Implicit
    This member is added by an implicit conversion from HashMap[A, B] to ArrowAssoc[HashMap[A, B]] performed by method ArrowAssoc in scala.Predef.
    Definition Classes
    ArrowAssoc

Shadowed Implicit Value Members

  1. def +(other: String): String
    Implicit
    This member is added by an implicit conversion from HashMap[A, B] to any2stringadd[HashMap[A, B]] performed by method any2stringadd in scala.Predef.
    Shadowing
    This implicitly inherited member is shadowed by one or more members in this class.
    To access this member you can use a type ascription:
    (hashMap: any2stringadd[HashMap[A, B]]).+(other)
    Definition Classes
    any2stringadd
  2. def filter(p: ((A, B)) ⇒ Boolean): TraversableOnce[(A, B)]
    Implicit
    This member is added by an implicit conversion from HashMap[A, B] to MonadOps[(A, B)] performed by method MonadOps in scala.collection.TraversableOnce.
    Shadowing
    This implicitly inherited member is shadowed by one or more members in this class.
    To access this member you can use a type ascription:
    (hashMap: MonadOps[(A, B)]).filter(p)
    Definition Classes
    MonadOps
  3. def flatMap[B](f: ((A, B)) ⇒ GenTraversableOnce[B]): TraversableOnce[B]
    Implicit
    This member is added by an implicit conversion from HashMap[A, B] to MonadOps[(A, B)] performed by method MonadOps in scala.collection.TraversableOnce.
    Shadowing
    This implicitly inherited member is shadowed by one or more members in this class.
    To access this member you can use a type ascription:
    (hashMap: MonadOps[(A, B)]).flatMap(f)
    Definition Classes
    MonadOps
  4. def map[B](f: ((A, B)) ⇒ B): TraversableOnce[B]
    Implicit
    This member is added by an implicit conversion from HashMap[A, B] to MonadOps[(A, B)] performed by method MonadOps in scala.collection.TraversableOnce.
    Shadowing
    This implicitly inherited member is shadowed by one or more members in this class.
    To access this member you can use a type ascription:
    (hashMap: MonadOps[(A, B)]).map(f)
    Definition Classes
    MonadOps
  5. def withFilter(p: ((A, B)) ⇒ Boolean): Iterator[(A, B)]
    Implicit
    This member is added by an implicit conversion from HashMap[A, B] to MonadOps[(A, B)] performed by method MonadOps in scala.collection.TraversableOnce.
    Shadowing
    This implicitly inherited member is shadowed by one or more members in this class.
    To access this member you can use a type ascription:
    (hashMap: MonadOps[(A, B)]).withFilter(p)
    Definition Classes
    MonadOps

Inherited from Serializable

Inherited from java.io.Serializable

Inherited from CustomParallelizable[(A, B), ParHashMap[A, B]]

Inherited from HashTable[A, DefaultEntry[A, B]]

Inherited from HashUtils[A]

Inherited from AbstractMap[A, B]

Inherited from Map[A, B]

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

Inherited from Cloneable[HashMap[A, B]]

Inherited from scala.Cloneable

Inherited from java.lang.Cloneable

Inherited from Shrinkable[A]

Inherited from Builder[(A, B), HashMap[A, B]]

Inherited from Growable[(A, B)]

Inherited from Clearable

Inherited from Iterable[(A, B)]

Inherited from Traversable[(A, B)]

Inherited from Mutable

Inherited from collection.AbstractMap[A, B]

Inherited from collection.Map[A, B]

Inherited from collection.MapLike[A, B, HashMap[A, B]]

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

Inherited from PartialFunction[A, B]

Inherited from (A) ⇒ B

Inherited from GenMap[A, B]

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

Inherited from collection.AbstractIterable[(A, B)]

Inherited from collection.Iterable[(A, B)]

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

Inherited from Equals

Inherited from GenIterable[(A, B)]

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

Inherited from AbstractTraversable[(A, B)]

Inherited from collection.Traversable[(A, B)]

Inherited from GenTraversable[(A, B)]

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

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

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

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

Inherited from TraversableOnce[(A, B)]

Inherited from GenTraversableOnce[(A, B)]

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

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

Inherited from AnyRef

Inherited from Any

Inherited by implicit conversion CollectionsHaveToParArray from HashMap[A, B] to CollectionsHaveToParArray[HashMap[A, B], T]

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

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

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

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

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

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

Ungrouped