HashMap

Companion object HashMap

final class HashMap[K, +V] extends AbstractMap[K, V] with StrictOptimizedMapOps[K, V, HashMap, HashMap[K, V]] with MapFactoryDefaults[K, V, HashMap, Iterable] with DefaultSerializable

This class implements immutable maps using a Compressed Hash-Array Mapped Prefix-tree. See paper https://michael.steindorfer.name/publications/oopsla15.pdf for more details.

K: the type of the keys contained in this hash set.
V: the type of the values associated with the keys in this hash map.

Source: HashMap.scala

Linear Supertypes

DefaultSerializable, java.io.Serializable, StrictOptimizedMapOps[K, V, HashMap, HashMap[K, V]], collection.StrictOptimizedMapOps[K, V, HashMap, HashMap[K, V]], StrictOptimizedIterableOps[(K, V), [_]Iterable[_], HashMap[K, V]], AbstractMap[K, V], Map[K, V], MapOps[K, V, [X, +Y]HashMap[X, Y], HashMap[K, V]], Iterable[(K, V)], collection.AbstractMap[K, V], collection.Map[K, V], Equals, MapFactoryDefaults[K, V, [x, y]HashMap[x, y], [x]Iterable[x]], collection.MapOps[K, V, [_, _]HashMap[_, _], HashMap[K, V]], PartialFunction[K, V], (K) => V, AbstractIterable[(K, V)], collection.Iterable[(K, V)], IterableFactoryDefaults[(K, V), [x]Iterable[x]], IterableOps[(K, V), [_]Iterable[_], HashMap[K, V]], IterableOnceOps[(K, V), [_]Iterable[_], HashMap[K, V]], IterableOnce[(K, V)], AnyRef, Any

Type Hierarchy

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By Inheritance

Inherited

HashMap
DefaultSerializable
Serializable
StrictOptimizedMapOps
StrictOptimizedMapOps
StrictOptimizedIterableOps
AbstractMap
Map
MapOps
Iterable
AbstractMap
Map
Equals
MapFactoryDefaults
MapOps
PartialFunction
Function1
AbstractIterable
Iterable
IterableFactoryDefaults
IterableOps
IterableOnceOps
IterableOnce
AnyRef
Any

Implicitly

by UnliftOps
by iterableOnceExtensionMethods
by any2stringadd
by StringFormat
by Ensuring
by ArrowAssoc

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Visibility

Public
Protected

Instance Constructors

new HashMap()

Type Members

trait GenKeySet extends AnyRef
A generic trait that is reused by keyset implementations
A generic trait that is reused by keyset implementations
Attributes
protected
Definition Classes
MapOps
class KeySet extends AbstractSet[K] with GenKeySet with DefaultSerializable
The implementation class of the set returned by keySet.
The implementation class of the set returned by keySet.
Attributes
protected
Definition Classes
MapOps
class ImmutableKeySet extends AbstractSet[K] with GenKeySet with DefaultSerializable
The implementation class of the set returned by keySet
The implementation class of the set returned by keySet
Attributes
protected[immutable]
Definition Classes
MapOps

Value Members

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
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
def +[V1 >: V](kv: (K, V1)): HashMap[K, V1]
Alias for updated
Alias for updated
V1
the type of the value in the key/value pair.
kv
the key/value pair.
returns
A new map with the new binding added to this map.
Definition Classes
MapOps → MapOps
def ++[V2 >: V](xs: IterableOnce[(K, V2)]): HashMap[K, V2]
Alias for concat
Alias for concat
Definition Classes
MapOps
final def ++[B >: (K, V)](suffix: IterableOnce[B]): Iterable[B]
Alias for concat
Alias for concat
Definition Classes
IterableOps
Annotations
@inline()
final def -(key: K): HashMap[K, V]
Alias for removed
Alias for removed
Definition Classes
MapOps
Annotations
@inline()
final def --(keys: IterableOnce[K]): HashMap[K, V]
Alias for removedAll
Alias for removedAll
Definition Classes
MapOps → MapOps
Annotations
@inline()
def ->[B](y: B): (HashMap[K, V], B)
Implicit
This member is added by an implicit conversion from HashMap[K, V] toArrowAssoc[HashMap[K, V]] performed by method ArrowAssoc in scala.Predef.This conversion will take place only if V is a subclass of Option[Nothing] (V <: Option[Nothing]).
Definition Classes
ArrowAssoc
Annotations
@inline()
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
def addString(sb: mutable.StringBuilder, start: String, sep: String, end: String): sb.type
Appends all elements of this immutable champ hash map to a string builder using start, end, and separator strings.
Appends all elements of this immutable champ hash map to a string builder using start, end, and separator strings. The written text begins with the string start and ends with the string end. Inside, the string representations (w.r.t. the method toString) of all elements of this immutable champ hash map are separated by the string sep.
Example:
```
scala> val a = List(1,2,3,4)
a: List[Int] = List(1, 2, 3, 4)

scala> val b = new StringBuilder()
b: StringBuilder =

scala> a.addString(b , "List(" , ", " , ")")
res5: StringBuilder = List(1, 2, 3, 4)
```
start
the starting string.
sep
the separator string.
end
the ending string.
returns
the string builder b to which elements were appended.
Definition Classes
MapOps → IterableOnceOps
final def addString(b: mutable.StringBuilder): b.type
Appends all elements of this immutable champ hash map to a string builder.
Appends all elements of this immutable champ hash map to a string builder. The written text consists of the string representations (w.r.t. the method toString) of all elements of this immutable champ hash map without any separator string.
Example:
```
scala> val a = List(1,2,3,4)
a: List[Int] = List(1, 2, 3, 4)

scala> val b = new StringBuilder()
b: StringBuilder =

scala> val h = a.addString(b)
h: StringBuilder = 1234
```
b
the string builder to which elements are appended.
returns
the string builder b to which elements were appended.
Definition Classes
IterableOnceOps
Annotations
@inline()
final def addString(b: mutable.StringBuilder, sep: String): b.type
Appends all elements of this immutable champ hash map to a string builder using a separator string.
Appends all elements of this immutable champ hash map to a string builder using a separator string. The written text consists of the string representations (w.r.t. the method toString) of all elements of this immutable champ hash map, separated by the string sep.
Example:
```
scala> val a = List(1,2,3,4)
a: List[Int] = List(1, 2, 3, 4)

scala> val b = new StringBuilder()
b: StringBuilder =

scala> a.addString(b, ", ")
res0: StringBuilder = 1, 2, 3, 4
```
b
the string builder to which elements are appended.
sep
the separator string.
returns
the string builder b to which elements were appended.
Definition Classes
IterableOnceOps
Annotations
@inline()
def andThen[C](k: PartialFunction[V, C]): PartialFunction[K, C]
Composes this partial function with another partial function that gets applied to results of this partial function.
Composes this partial function with another partial function that gets applied to results of this partial function.
Note that calling isDefinedAt on the resulting partial function may apply the first partial function and execute its side effect. For efficiency, it is recommended to call applyOrElse instead of isDefinedAt or apply.
C
the result type of the transformation function.
k
the transformation function
returns
a partial function with the domain of this partial function narrowed by other partial function, which maps arguments x to k(this(x)).
Definition Classes
PartialFunction
def andThen[C](k: (V) => C): PartialFunction[K, C]
Composes this partial function with a transformation function that gets applied to results of this partial function.
Composes this partial function with a transformation function that gets applied to results of this partial function.
If the runtime type of the function is a PartialFunction then the other andThen method is used (note its cautions).
C
the result type of the transformation function.
k
the transformation function
returns
a partial function with the domain of this partial function, possibly narrowed by the specified function, which maps arguments x to k(this(x)).
Definition Classes
PartialFunction → Function1
def apply(key: K): V
Retrieves the value which is associated with the given key.
Retrieves the value which is associated with the given key. This method invokes the default method of the map if there is no mapping from the given key to a value. Unless overridden, the default method throws a NoSuchElementException.
key
the key
returns
the value associated with the given key, or the result of the map's default method, if none exists.
Definition Classes
HashMap → MapOps → Function1
def applyOrElse[K1 <: K, V1 >: V](x: K1, default: (K1) => V1): V1
Applies this partial function to the given argument when it is contained in the function domain.
Applies this partial function to the given argument when it is contained in the function domain. Applies fallback function where this partial function is not defined.
Note that expression pf.applyOrElse(x, default) is equivalent to
```
if(pf isDefinedAt x) pf(x) else default(x)
```
except that applyOrElse method can be implemented more efficiently. For all partial function literals the compiler generates an applyOrElse implementation which avoids double evaluation of pattern matchers and guards. This makes applyOrElse the basis for the efficient implementation for many operations and scenarios, such as:
- combining partial functions into orElse/andThen chains does not lead to excessive apply/isDefinedAt evaluation
- lift and unlift do not evaluate source functions twice on each invocation
- runWith allows efficient imperative-style combining of partial functions with conditionally applied actions
For non-literal partial function classes with nontrivial isDefinedAt method it is recommended to override applyOrElse with custom implementation that avoids double isDefinedAt evaluation. This may result in better performance and more predictable behavior w.r.t. side effects.
x
the function argument
default
the fallback function
returns
the result of this function or fallback function application.
Definition Classes
MapOps → PartialFunction
final def asInstanceOf[T0]: T0
Forces the compiler to treat the receiver object as having type T0, even though doing so may violate type safety.
Forces the compiler to treat the receiver object as having type T0, even though doing so may violate type safety.
This method is useful when you believe you have type information the compiler doesn't, and it also isn't possible to check the type at runtime. In such situations, skipping type safety is the only option.
It is platform dependent whether asInstanceOf has any effect at runtime. It might do a runtime type test on the erasure of T0, insert a conversion (such as boxing/unboxing), fill in a default value, or do nothing at all.
In particular, asInstanceOf is not a type test. It does **not** mean:
```
this match {
 case x: T0 => x
 case _     => throw ClassCastException("...")
```
Use pattern matching or isInstanceOf for type testing instead.
Situations where asInstanceOf is useful:
- when flow analysis fails to deduce T0 automatically
- when down-casting a type parameter or an abstract type member (which cannot be checked at runtime due to type erasure) If there is any doubt and you are able to type test instead, you should do so.
Be careful of using asInstanceOf when T0 is a primitive type. When T0 is primitive, asInstanceOf may insert a conversion instead of a type test. If your intent is to convert, use a toT method (x.toChar, x.toByte, etc.).
returns
the receiver object.
Definition Classes
Any
Exceptions thrown
ClassCastException if the receiver is not an instance of the erasure of T0, if that can be checked on this platform
def canEqual(that: Any): Boolean
Checks whether this instance can possibly equal that.
Checks whether this instance can possibly equal that.
A method that should be called from every well-designed equals method that is open to be overridden in a subclass. See Programming in Scala, Chapter 28 for discussion and design.
that
the value being probed for possible equality
returns
true if this instance can possibly equal that, otherwise false
Definition Classes
Map → Equals
def className: String
Defines the prefix of this object's toString representation.
Defines the prefix of this object's toString representation.
It is recommended to return the name of the concrete collection type, but not implementation subclasses. For example, for ListMap this method should return "ListMap", not "Map" (the supertype) or "Node" (an implementation subclass).
The default implementation returns "Iterable". It is overridden for the basic collection kinds "Seq", "IndexedSeq", "LinearSeq", "Buffer", "Set", "Map", "SortedSet", "SortedMap" and "View".
returns
a string representation which starts the result of toString applied to this immutable champ hash map. By default the string prefix is the simple name of the collection class immutable champ hash map.
Attributes
protected[this]
Definition Classes
HashMap → Iterable
def clone(): AnyRef
Create a copy of the receiver object.
Create a copy of the receiver object.
The default implementation of the clone method is platform dependent.
returns
a copy of the receiver object.
Attributes
protected[lang]
Definition Classes
AnyRef
Annotations
@throws(classOf[java.lang.CloneNotSupportedException]) @native()
Note
not specified by SLS as a member of AnyRef
final def coll: HashMap.this.type
returns
This collection as a C.
Attributes
protected
Definition Classes
Iterable → IterableOps
def collect[K2, V2](pf: PartialFunction[(K, V), (K2, V2)]): HashMap[K2, V2]
Builds a new collection by applying a partial function to all elements of this immutable champ hash map on which the function is defined.
Builds a new collection by applying a partial function to all elements of this immutable champ hash map on which the function is defined.
K2
the key type of the returned immutable champ hash map.
V2
the value type of the returned immutable champ hash map.
pf
the partial function which filters and maps the immutable champ hash map.
returns
a new immutable champ 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
StrictOptimizedMapOps → MapOps
def collect[B](pf: PartialFunction[(K, V), B]): Iterable[B]
Builds a new immutable champ hash map by applying a partial function to all elements of this immutable champ hash map on which the function is defined.
Builds a new immutable champ hash map by applying a partial function to all elements of this immutable champ hash map on which the function is defined.
B
the element type of the returned immutable champ hash map.
pf
the partial function which filters and maps the immutable champ hash map.
returns
a new immutable champ 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
StrictOptimizedIterableOps → IterableOps → IterableOnceOps
def collectFirst[B](pf: PartialFunction[(K, V), B]): Option[B]
Finds the first element of the immutable champ hash map for which the given partial function is defined, and applies the partial function to it.
Finds the first element of the immutable champ hash map for which the given partial function is defined, and applies the partial function to it.
Note: may not terminate for infinite-sized collections.
Note: might return different results for different runs, unless the underlying collection type is ordered.
pf
the partial function
returns
an option value containing pf applied to the first value for which it is defined, or None if none exists.
Definition Classes
IterableOnceOps
Example:
1. Seq("a", 1, 5L).collectFirst({ case x: Int => x*10 }) = Some(10)
def compose[R](k: PartialFunction[R, K]): PartialFunction[R, V]
Composes another partial function k with this partial function so that this partial function gets applied to results of k.
Composes another partial function k with this partial function so that this partial function gets applied to results of k.
Note that calling isDefinedAt on the resulting partial function may apply the first partial function and execute its side effect. For efficiency, it is recommended to call applyOrElse instead of isDefinedAt or apply.
R
the parameter type of the transformation function.
k
the transformation function
returns
a partial function with the domain of other partial function narrowed by this partial function, which maps arguments x to this(k(x)).
Definition Classes
PartialFunction
def compose[A](g: (A) => K): (A) => V
Composes two instances of Function1 in a new Function1, with this function applied last.
Composes two instances of Function1 in a new Function1, with this function applied last.
A
the type to which function g can be applied
g
a function A => T1
returns
a new function f such that f(x) == apply(g(x))
Definition Classes
Function1
Annotations
@unspecialized()
def concat[V1 >: V](that: scala.IterableOnce[(K, V1)]): HashMap[K, V1]
Returns a new immutable champ hash map containing the elements from the left hand operand followed by the elements from the right hand operand.
Returns a new immutable champ hash map containing the elements from the left hand operand followed by the elements from the right hand operand. The element type of the immutable champ hash map is the most specific superclass encompassing the element types of the two operands.
returns
a new immutable champ hash map which contains all elements of this immutable champ hash map followed by all elements of suffix.
Definition Classes
HashMap → StrictOptimizedMapOps → StrictOptimizedMapOps → MapOps
def concat[B >: (K, V)](suffix: IterableOnce[B]): Iterable[B]
Returns a new immutable champ hash map containing the elements from the left hand operand followed by the elements from the right hand operand.
Returns a new immutable champ hash map containing the elements from the left hand operand followed by the elements from the right hand operand. The element type of the immutable champ hash map is the most specific superclass encompassing the element types of the two operands.
B
the element type of the returned collection.
suffix
the iterable to append.
returns
a new immutable champ hash map which contains all elements of this immutable champ hash map followed by all elements of suffix.
Definition Classes
IterableOps
final def contains(key: K): Boolean
Tests whether this map contains a binding for a key.
Tests whether this map contains a binding for a key.
key
the key
returns
true if there is a binding for key in this map, false otherwise.
Definition Classes
HashMap → MapOps
def copyToArray[B >: (K, V)](xs: Array[B], start: Int, len: Int): Int
Copy elements to an array, returning the number of elements written.
Copy elements to an array, returning the number of elements written.
Fills the given array xs starting at index start with at most len elements of this immutable champ hash map.
Copying will stop once either all the elements of this immutable champ hash map have been copied, or the end of the array is reached, or len elements have been copied.
B
the type of the elements of the array.
xs
the array to fill.
start
the starting index of xs.
len
the maximal number of elements to copy.
returns
the number of elements written to the array
Definition Classes
IterableOnceOps
Note
Reuse: After calling this method, one should discard the iterator it was called on. Using it is undefined and subject to change.
def copyToArray[B >: (K, V)](xs: Array[B], start: Int): Int
Copies elements to an array, returning the number of elements written.
Copies elements to an array, returning the number of elements written.
Fills the given array xs starting at index start with values of this immutable champ hash map.
Copying will stop once either all the elements of this immutable champ hash map have been copied, or the end of the array is reached.
B
the type of the elements of the array.
xs
the array to fill.
start
the starting index of xs.
returns
the number of elements written to the array
Definition Classes
IterableOnceOps
Annotations
@deprecatedOverriding()
Note
Reuse: After calling this method, one should discard the iterator it was called on. Using it is undefined and subject to change.
def copyToArray[B >: (K, V)](xs: Array[B]): Int
Copies elements to an array, returning the number of elements written.
Copies elements to an array, returning the number of elements written.
Fills the given array xs starting at index start with values of this immutable champ hash map.
Copying will stop once either all the elements of this immutable champ hash map have been copied, or the end of the array is reached.
B
the type of the elements of the array.
xs
the array to fill.
returns
the number of elements written to the array
Definition Classes
IterableOnceOps
Annotations
@deprecatedOverriding()
Note
Reuse: After calling this method, one should discard the iterator it was called on. Using it is undefined and subject to change.
def corresponds[B](that: IterableOnce[B])(p: ((K, V), B) => Boolean): Boolean
Tests whether every element of this collection's iterator relates to the corresponding element of another collection by satisfying a test predicate.
Tests whether every element of this collection's iterator relates to the corresponding element of another collection by satisfying a test predicate.
Note: will not terminate for infinite-sized collections.
B
the type of the elements of that
that
the other collection
p
the test predicate, which relates elements from both collections
returns
true if both collections have the same length and p(x, y) is true for all corresponding elements x of this iterator and y of that, otherwise false
Definition Classes
IterableOnceOps
def count(p: ((K, V)) => Boolean): Int
Counts the number of elements in the immutable champ hash map which satisfy a predicate.
Counts the number of elements in the immutable champ hash map which satisfy a predicate.
Note: will not terminate for infinite-sized collections.
p
the predicate used to test elements.
returns
the number of elements satisfying the predicate p.
Definition Classes
IterableOnceOps
def default(key: K): V
Defines the default value computation for the map, returned when a key is not found.
Defines the default value computation for the map, returned when a key is not found.
The method implemented here throws an exception, but it may be overridden by subclasses.
key
the given key value for which a binding is missing.
Definition Classes
MapOps
Annotations
@throws(cause = scala.this.throws.<init>$default$1[NoSuchElementException])
Exceptions thrown
NoSuchElementException if no default value is defined
def drop(n: Int): HashMap[K, V]
Selects all elements except the first n ones.
Selects all elements except the first n ones.
Note: might return different results for different runs, unless the underlying collection type is ordered.
n
the number of elements to drop from this immutable champ hash map.
returns
a immutable champ hash map consisting of all elements of this immutable champ hash map except the first n ones, or else the empty immutable champ hash map, if this immutable champ hash map has less than n elements. If n is negative, don't drop any elements.
Definition Classes
HashMap → IterableOps → IterableOnceOps
def dropRight(n: Int): HashMap[K, V]
The rest of the collection without its n last elements.
The rest of the collection without its n last elements. For linear, immutable collections this should avoid making a copy.
Note: Even when applied to a view or a lazy collection it will always force the elements.
n
the number of elements to drop from this immutable champ hash map.
returns
a immutable champ hash map consisting of all elements of this immutable champ hash map except the last n ones, or else the empty immutable champ hash map, if this immutable champ hash map has less than n elements. If n is negative, don't drop any elements.
Definition Classes
HashMap → StrictOptimizedIterableOps → IterableOps
def dropWhile(p: ((K, V)) => Boolean): HashMap[K, V]
Selects all elements except the longest prefix that satisfies a predicate.
Selects all elements except the longest prefix that satisfies a predicate.
The matching prefix starts with the first element of this immutable champ hash map, and the element following the prefix is the first element that does not satisfy the predicate. The matching prefix may be empty, so that this method returns the entire immutable champ hash map.
Example:
```
scala> List(1, 2, 3, 100, 4).dropWhile(n => n < 10)
val res0: List[Int] = List(100, 4)

scala> List(1, 2, 3, 100, 4).dropWhile(n => n == 0)
val res1: List[Int] = List(1, 2, 3, 100, 4)
```
Use span to obtain both the prefix and suffix. Use filterNot to drop all elements that satisfy the predicate.
Note: might return different results for different runs, unless the underlying collection type is ordered.
p
The predicate used to test elements.
returns
the longest suffix of this immutable champ hash map whose first element does not satisfy the predicate p.
Definition Classes
HashMap → IterableOps → IterableOnceOps
def elementWise: ElementWiseExtractor[K, V]
Returns an extractor object with a unapplySeq method, which extracts each element of a sequence data.
Returns an extractor object with a unapplySeq method, which extracts each element of a sequence data.
Definition Classes
PartialFunction
Example:
1. val firstChar: String => Option[Char] = _.headOption Seq("foo", "bar", "baz") match { case firstChar.unlift.elementWise(c0, c1, c2) => println(s"$c0, $c1, $c2") // Output: f, b, b }
def empty: HashMap[K, V]
The empty iterable of the same type as this iterable.
The empty iterable of the same type as this iterable.
returns
an empty iterable of type C.
Definition Classes
MapFactoryDefaults → IterableOps
def ensuring(cond: (HashMap[K, V]) => Boolean, msg: => Any): HashMap[K, V]
Implicit
This member is added by an implicit conversion from HashMap[K, V] toEnsuring[HashMap[K, V]] performed by method Ensuring in scala.Predef.
Definition Classes
Ensuring
def ensuring(cond: (HashMap[K, V]) => Boolean): HashMap[K, V]
Implicit
This member is added by an implicit conversion from HashMap[K, V] toEnsuring[HashMap[K, V]] performed by method Ensuring in scala.Predef.
Definition Classes
Ensuring
def ensuring(cond: Boolean, msg: => Any): HashMap[K, V]
Implicit
This member is added by an implicit conversion from HashMap[K, V] toEnsuring[HashMap[K, V]] performed by method Ensuring in scala.Predef.
Definition Classes
Ensuring
def ensuring(cond: Boolean): HashMap[K, V]
Implicit
This member is added by an implicit conversion from HashMap[K, V] toEnsuring[HashMap[K, V]] performed by method Ensuring in scala.Predef.
Definition Classes
Ensuring
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
def equals(that: Any): Boolean
Equality of maps is implemented using the lookup method get.
Equality of maps is implemented using the lookup method get. This method returns true if
- the argument o is a Map,
- the two maps have the same size, and
- for every (key, value) pair in this map, other.get(key) == Some(value).
The implementation of equals checks the canEqual method, so subclasses of Map can narrow down the equality to specific map types. The Map implementations in the standard library can all be compared, their canEqual methods return true.
Note: The equals method only respects the equality laws (symmetry, transitivity) if the two maps use the same key equivalence function in their lookup operation. For example, the key equivalence operation in a scala.collection.immutable.TreeMap is defined by its ordering. Comparing a TreeMap with a HashMap leads to unexpected results if ordering.equiv(k1, k2) (used for lookup in TreeMap) is different from k1 == k2 (used for lookup in HashMap).
```
scala> import scala.collection.immutable._
scala> val ord: Ordering[String] = _ compareToIgnoreCase _

scala> TreeMap("A" -> 1)(ord) == HashMap("a" -> 1)
val res0: Boolean = false

scala> HashMap("a" -> 1) == TreeMap("A" -> 1)(ord)
val res1: Boolean = true
```
returns
true if the two maps are equal according to the description
Definition Classes
HashMap → Map → Equals → AnyRef → Any
def exists(p: ((K, V)) => Boolean): Boolean
Tests whether a predicate holds for at least one element of this immutable champ hash map.
Tests whether a predicate holds for at least one element of this immutable champ hash map.
Note: may not terminate for infinite-sized collections.
p
the predicate used to test elements.
returns
true if the given predicate p is satisfied by at least one element of this immutable champ hash map, otherwise false
Definition Classes
IterableOnceOps
def filter(pred: ((K, V)) => Boolean): HashMap[K, V]
Selects all elements of this immutable champ hash map which satisfy a predicate.
Selects all elements of this immutable champ hash map which satisfy a predicate.
returns
a new immutable champ hash map consisting of all elements of this immutable champ hash map that satisfy the given predicate p. The order of the elements is preserved.
Definition Classes
StrictOptimizedIterableOps → IterableOps → IterableOnceOps
def filterImpl(pred: ((K, V)) => Boolean, isFlipped: Boolean): HashMap[K, V]
Attributes
protected[collection]
Definition Classes
HashMap → StrictOptimizedIterableOps
def filterNot(pred: ((K, V)) => Boolean): HashMap[K, V]
Selects all elements of this immutable champ hash map which do not satisfy a predicate.
Selects all elements of this immutable champ hash map which do not satisfy a predicate.
pred
the predicate used to test elements.
returns
a new immutable champ hash map consisting of all elements of this immutable champ hash map that do not satisfy the given predicate pred. Their order may not be preserved.
Definition Classes
StrictOptimizedIterableOps → IterableOps → IterableOnceOps
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
def find(p: ((K, V)) => Boolean): Option[(K, V)]
Finds the first element of the immutable champ hash map satisfying a predicate, if any.
Finds the first element of the immutable champ hash map satisfying a predicate, if any.
Note: may not terminate for infinite-sized collections.
Note: might return different results for different runs, unless the underlying collection type is ordered.
p
the predicate used to test elements.
returns
an option value containing the first element in the immutable champ hash map that satisfies p, or None if none exists.
Definition Classes
IterableOnceOps
def flatMap[K2, V2](f: ((K, V)) => IterableOnce[(K2, V2)]): HashMap[K2, V2]
Builds a new map by applying a function to all elements of this immutable champ hash map and using the elements of the resulting collections.
Builds a new map by applying a function to all elements of this immutable champ hash map and using the elements of the resulting collections.
f
the function to apply to each element.
returns
a new immutable champ hash map resulting from applying the given collection-valued function f to each element of this immutable champ hash map and concatenating the results.
Definition Classes
StrictOptimizedMapOps → MapOps
def flatMap[B](f: ((K, V)) => IterableOnce[B]): Iterable[B]
Builds a new immutable champ hash map by applying a function to all elements of this immutable champ hash map and using the elements of the resulting collections.
Builds a new immutable champ hash map by applying a function to all elements of this immutable champ 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 immutable champ 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: String) => word.toSeq)

// xs will be an Iterable[Int]
val xs = Map("a" -> List(11,111), "b" -> List(22,222)).flatMap(_._2)

// ys will be a Map[Int, Int]
val ys = Map("a" -> List(1 -> 11,1 -> 111), "b" -> List(2 -> 22,2 -> 222)).flatMap(_._2)
```
B
the element type of the returned collection.
f
the function to apply to each element.
returns
a new immutable champ hash map resulting from applying the given collection-valued function f to each element of this immutable champ hash map and concatenating the results.
Definition Classes
StrictOptimizedIterableOps → IterableOps → IterableOnceOps
def flatten[B](implicit toIterableOnce: ((K, V)) => IterableOnce[B]): Iterable[B]
Converts this immutable champ hash map of iterable collections into a immutable champ hash map formed by the elements of these iterable collections.
Converts this immutable champ hash map of iterable collections into a immutable champ hash map formed by the elements of these iterable collections.
The resulting collection's type will be guided by the type of immutable champ 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 iterable collection.
returns
a new immutable champ hash map resulting from concatenating all element immutable champ hash maps.
Definition Classes
StrictOptimizedIterableOps → IterableOps → IterableOnceOps
def fold[A1 >: (K, V)](z: A1)(op: (A1, A1) => A1): A1
Applies the given binary operator op to the given initial value z and all elements of this immutable champ hash map.
Applies the given binary operator op to the given initial value z and all elements of this immutable champ hash map.
For each application of the operator, each operand is either an element of this immutable champ hash map, the initial value, or another such application of the operator.
The order of applications of the operator is unspecified and may be nondeterministic. Each element appears exactly once in the computation. The initial value may be used an arbitrary number of times, but at least once.
If this collection is ordered, then for any application of the operator, the element(s) appearing in the left operand will precede those in the right.
Note: might return different results for different runs, unless either of the following conditions is met: (1) the operator is associative, and the underlying collection type is ordered; or (2) the operator is associative and commutative. In either case, it is also necessary that the initial value be a neutral value for the operator, e.g. Nil for List concatenation or 1 for multiplication.
The default implementation in IterableOnce is equivalent to foldLeft but may be overridden for more efficient traversal orders.
Note: will not terminate for infinite-sized collections.
A1
The type parameter for the binary operator, a supertype of A.
z
An initial value; may be used an arbitrary number of times in the computation of the result; must be a neutral value for op for the result to always be the same across runs.
op
A binary operator; must be associative for the result to always be the same across runs.
returns
The result of applying op between all the elements and z, or z if this immutable champ hash map is empty.
Definition Classes
IterableOnceOps
def foldLeft[B](z: B)(op: (B, (K, V)) => B): B
Applies the given binary operator op to the given initial value z and all elements of this immutable champ hash map, going left to right.
Applies the given binary operator op to the given initial value z and all elements of this immutable champ hash map, going left to right. Returns the initial value if this immutable champ hash map is empty.
"Going left to right" only makes sense if this collection is ordered: then if x₁, x₂, ..., x_n are the elements of this immutable champ hash map, the result is op( op( ... op( op(z, x₁), x₂) ... ), x_n).
If this collection is not ordered, then for each application of the operator, each right operand is an element. In addition, the leftmost operand is the initial value, and each other left operand is itself an application of the operator. The elements of this immutable champ hash map and the initial value all appear exactly once in the computation.
Note: might return different results for different runs, unless the underlying collection type is ordered.
Note: will not terminate for infinite-sized collections.
B
The result type of the binary operator.
z
An initial value.
op
A binary operator.
returns
The result of applying op to z and all elements of this immutable champ hash map, going left to right. Returns z if this immutable champ hash map is empty.
Definition Classes
IterableOnceOps
def foldRight[B](z: B)(op: ((K, V), B) => B): B
Applies the given binary operator op to all elements of this immutable champ hash map and the given initial value z, going right to left.
Applies the given binary operator op to all elements of this immutable champ hash map and the given initial value z, going right to left. Returns the initial value if this immutable champ hash map is empty.
"Going right to left" only makes sense if this collection is ordered: then if x₁, x₂, ..., x_n are the elements of this immutable champ hash map, the result is op(x₁, op(x₂, op( ... op(x_n, z) ... ))).
If this collection is not ordered, then for each application of the operator, each left operand is an element. In addition, the rightmost operand is the initial value, and each other right operand is itself an application of the operator. The elements of this immutable champ hash map and the initial value all appear exactly once in the computation.
Note: might return different results for different runs, unless the underlying collection type is ordered.
Note: will not terminate for infinite-sized collections.
B
The result type of the binary operator.
z
An initial value.
op
A binary operator.
returns
The result of applying op to all elements of this immutable champ hash map and z, going right to left. Returns z if this immutable champ hash map is empty.
Definition Classes
IterableOnceOps
def forall(p: ((K, V)) => Boolean): Boolean
Tests whether a predicate holds for all elements of this immutable champ hash map.
Tests whether a predicate holds for all elements of this immutable champ hash map.
Note: may not terminate for infinite-sized collections.
p
the predicate used to test elements.
returns
true if this immutable champ hash map is empty or the given predicate p holds for all elements of this immutable champ hash map, otherwise false.
Definition Classes
IterableOnceOps
def foreach[U](f: ((K, V)) => U): Unit
Applies f to each element for its side effects.
Applies f to each element for its side effects. Note: U parameter needed to help scalac's type inference.
Definition Classes
HashMap → IterableOnceOps
def foreachEntry[U](f: (K, V) => U): Unit
Apply f to each key/value pair for its side effects Note: [U] parameter needed to help scalac's type inference.
Apply f to each key/value pair for its side effects Note: [U] parameter needed to help scalac's type inference.
Definition Classes
HashMap → MapOps
def fromSpecific(coll: IterableOnce[(K, V)]): HashMap[K, V]
Defines how to turn a given Iterable[A] into a collection of type C.
Defines how to turn a given Iterable[A] into a collection of type C.
This process can be done in a strict way or a non-strict way (ie. without evaluating the elements of the resulting collections). In other words, this methods defines the evaluation model of the collection.
Attributes
protected
Definition Classes
MapFactoryDefaults → IterableOps
Note
When implementing a custom collection type and refining C to the new type, this method needs to be overridden (the compiler will issue an error otherwise). In the common case where C =:= CC[A], this can be done by mixing in the scala.collection.IterableFactoryDefaults trait, which implements the method using iterableFactory.
,
As witnessed by the @uncheckedVariance annotation, using this method might be unsound. However, as long as it is called with an Iterable[A] obtained from this collection (as it is the case in the implementations of operations where we use a View[A]), it is safe.
def get(key: K): Option[V]
Optionally returns the value associated with a key.
Optionally returns the value associated with a key.
key
the key value
returns
an option value containing the value associated with key in this map, or None if none exists.
Definition Classes
HashMap → MapOps
final def getClass(): Class[_ <: AnyRef]
Returns the runtime class representation of the object.
Returns the runtime class representation of the object.
returns
a class object corresponding to the runtime type of the receiver.
Definition Classes
AnyRef → Any
Annotations
@native()
def getOrElse[V1 >: V](key: K, default: => V1): V1
Returns the value associated with a key, or a default value if the key is not contained in the map.
Returns the value associated with a key, or a default value if the key is not contained in the map.
V1
the result type of the default computation.
key
the key.
default
a computation that yields a default value in case no binding for key is found in the map.
returns
the value associated with key if it exists, otherwise the result of the default computation.
Definition Classes
HashMap → MapOps
def groupBy[K](f: ((K, V)) => K): Map[K, HashMap[K, V]]
Partitions this immutable champ hash map into a map of immutable champ hash maps according to some discriminator function.
Partitions this immutable champ hash map into a map of immutable champ hash maps according to some discriminator function.
Note: Even when applied to a view or a lazy collection it will always force the elements.
K
the type of keys returned by the discriminator function.
f
the discriminator function.
returns
A map from keys to immutable champ hash maps such that the following invariant holds:
```
(xs groupBy f)(k) = xs filter (x => f(x) == k)
```
That is, every key k is bound to a immutable champ hash map of those elements x for which f(x) equals k.
Definition Classes
IterableOps
def groupMap[K, B](key: ((K, V)) => K)(f: ((K, V)) => B): Map[K, Iterable[B]]
Partitions this immutable champ hash map into a map of immutable champ hash maps according to a discriminator function key.
Partitions this immutable champ hash map into a map of immutable champ hash maps according to a discriminator function key. Each element in a group is transformed into a value of type B using the value function.
It is equivalent to groupBy(key).mapValues(_.map(f)), but more efficient.
```
case class User(name: String, age: Int)

def namesByAge(users: Seq[User]): Map[Int, Seq[String]] =
  users.groupMap(_.age)(_.name)
```
Note: Even when applied to a view or a lazy collection it will always force the elements.
K
the type of keys returned by the discriminator function
B
the type of values returned by the transformation function
key
the discriminator function
f
the element transformation function
Definition Classes
IterableOps
def groupMapReduce[K, B](key: ((K, V)) => K)(f: ((K, V)) => B)(reduce: (B, B) => B): Map[K, B]
Partitions this immutable champ hash map into a map according to a discriminator function key.
Partitions this immutable champ hash map into a map according to a discriminator function key. All the values that have the same discriminator are then transformed by the f function and then reduced into a single value with the reduce function.
It is equivalent to groupBy(key).mapValues(_.map(f).reduce(reduce)), but more efficient.
```
def occurrences[A](as: Seq[A]): Map[A, Int] =
  as.groupMapReduce(identity)(_ => 1)(_ + _)
```
Note: Even when applied to a view or a lazy collection it will always force the elements.
Definition Classes
IterableOps
def grouped(size: Int): Iterator[HashMap[K, V]]
Partitions elements in fixed size immutable champ hash maps.
Partitions elements in fixed size immutable champ hash maps.
size
the number of elements per group
returns
An iterator producing immutable champ hash maps of size size, except the last will be less than size size if the elements don't divide evenly.
Definition Classes
IterableOps
See also
scala.collection.Iterator, method grouped
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
HashMap → Map → AnyRef → Any
def head: (K, V)
Selects the first element of this immutable champ hash map.
Selects the first element of this immutable champ hash map.
Note: might return different results for different runs, unless the underlying collection type is ordered.
returns
the first element of this immutable champ hash map.
Definition Classes
HashMap → IterableOps
Exceptions thrown
NoSuchElementException if the immutable champ hash map is empty.
def headOption: Option[(K, V)]
Optionally selects the first element.
Optionally selects the first element.
Note: might return different results for different runs, unless the underlying collection type is ordered.
returns
the first element of this immutable champ hash map if it is nonempty, None if it is empty.
Definition Classes
IterableOps
def init: HashMap[K, V]
The initial part of the collection without its last element.
The initial part of the collection without its last element.
Note: Even when applied to a view or a lazy collection it will always force the elements.
Definition Classes
HashMap → IterableOps
def inits: Iterator[HashMap[K, V]]
Iterates over the inits of this immutable champ hash map.
Iterates over the inits of this immutable champ hash map. The first value will be this immutable champ hash map and the final one will be an empty immutable champ hash map, with the intervening values the results of successive applications of init.
Note: Even when applied to a view or a lazy collection it will always force the elements.
returns
an iterator over all the inits of this immutable champ hash map
Definition Classes
IterableOps
Example:
1. List(1,2,3).inits = Iterator(List(1,2,3), List(1,2), List(1), Nil)
def isDefinedAt(key: K): Boolean
Tests whether this map contains a binding for a key.
Tests whether this map contains a binding for a key. This method, which implements an abstract method of trait PartialFunction, is equivalent to contains.
key
the key
returns
true if there is a binding for key in this map, false otherwise.
Definition Classes
MapOps → PartialFunction
def isEmpty: Boolean
Tests whether the immutable champ hash map is empty.
Tests whether the immutable champ hash map is empty.
Note: The default implementation creates and discards an iterator.
Note: Implementations in subclasses that are not repeatedly iterable must take care not to consume any elements when isEmpty is called.
returns
true if the immutable champ hash map contains no elements, false otherwise.
Definition Classes
HashMap → IterableOnceOps
final def isInstanceOf[T0]: Boolean
Test whether the dynamic type of the receiver object has the same erasure as T0.
Test whether the dynamic type of the receiver object has the same erasure as T0.
Depending on what T0 is, the test is done in one of the below ways:
- T0 is a non-parameterized class type, e.g. BigDecimal: this method returns true if the value of the receiver object is a BigDecimal or a subtype of BigDecimal.
- T0 is a parameterized class type, e.g. List[Int]: this method returns true if the value of the receiver object is some List[X] for any X. For example, List(1, 2, 3).isInstanceOf[List[String]] will return true.
- T0 is some singleton type x.type or literal x: this method returns this.eq(x). For example, x.isInstanceOf[1] is equivalent to x.eq(1)
- T0 is an intersection X with Y or X & Y: this method is equivalent to x.isInstanceOf[X] && x.isInstanceOf[Y]
- T0 is a union X | Y: this method is equivalent to x.isInstanceOf[X] || x.isInstanceOf[Y]
- T0 is a type parameter or an abstract type member: this method is equivalent to isInstanceOf[U] where U is T0's upper bound, Any if T0 is unbounded. For example, x.isInstanceOf[A] where A is an unbounded type parameter will return true for any value of x.
This is exactly equivalent to the type pattern _: T0
returns
true if the receiver object is an instance of erasure of type T0; false otherwise.
Definition Classes
Any
Note
due to the unexpectedness of List(1, 2, 3).isInstanceOf[List[String]] returning true and x.isInstanceOf[A] where A is a type parameter or abstract member returning true, these forms issue a warning.
def isTraversableAgain: Boolean
Tests whether this immutable champ hash map can be repeatedly traversed.
Tests whether this immutable champ hash map can be repeatedly traversed. Always true for Iterables and false for Iterators unless overridden.
returns
true if it is repeatedly traversable, false otherwise.
Definition Classes
IterableOps → IterableOnceOps
def iterableFactory: IterableFactory[Iterable]
The companion object of this immutable champ hash map, providing various factory methods.
The companion object of this immutable champ hash map, providing various factory methods.
Definition Classes
Iterable → Iterable → IterableOps
Note
When implementing a custom collection type and refining CC to the new type, this method needs to be overridden to return a factory for the new type (the compiler will issue an error otherwise).
def iterator: Iterator[(K, V)]
An scala.collection.Iterator over the elements of this immutable champ hash map.
An scala.collection.Iterator over the elements of this immutable champ hash map.
If an IterableOnce object is in fact an scala.collection.Iterator, this method always returns itself, in its current state, but if it is an scala.collection.Iterable, this method always returns a new scala.collection.Iterator.
Definition Classes
HashMap → IterableOnce
def keySet: Set[K]
A set representing the keys contained by this map.
A set representing the keys contained by this map.
For efficiency the resulting set may be a view (maintaining a reference to the map and reflecting modifications to the map), but it may also be a strict collection without reference to the map.
- To ensure an independent strict collection, use m.keysIterator.toSet
- To obtain a view on the keys, use scala.collection.View.fromIteratorProvider(m.keysIterator)
returns
a set representing the keys contained by this map
Definition Classes
HashMap → MapOps → MapOps
def keyStepper[S <: Stepper[_]](implicit shape: StepperShape[K, S]): S with EfficientSplit
Returns a Stepper for the keys of this map.
Returns a Stepper for the keys of this map. See method stepper.
Definition Classes
HashMap → MapOps
def keys: collection.Iterable[K]
An Iterable collection of the keys contained by this map.
An Iterable collection of the keys contained by this map.
For efficiency the resulting collection may be a view (maintaining a reference to the map and reflecting modifications to the map), but it may also be a strict collection without reference to the map.
- To ensure an independent strict collection, use m.keysIterator.toSet
- To obtain a view on the keys, use scala.collection.View.fromIteratorProvider(m.keysIterator)
returns
an Iterable collection of the keys contained by this map
Definition Classes
MapOps
Annotations
@deprecatedOverriding()
def keysIterator: Iterator[K]
An Iterator of the keys contained by this map.
An Iterator of the keys contained by this map.
returns
an Iterator of the keys contained by this map
Definition Classes
HashMap → MapOps
def knownSize: Int
The number of elements in this immutable champ hash map, if it can be cheaply computed, -1 otherwise.
The number of elements in this immutable champ hash map, if it can be cheaply computed, -1 otherwise. Cheaply usually means: Not requiring a collection traversal.
Definition Classes
HashMap → IterableOnce
def last: (K, V)
Selects the last element.
Selects the last element.
Note: might return different results for different runs, unless the underlying collection type is ordered.
returns
The last element of this immutable champ hash map.
Definition Classes
HashMap → IterableOps
Exceptions thrown
NoSuchElementException If the immutable champ hash map is empty.
def lastOption: Option[(K, V)]
Optionally selects the last element.
Optionally selects the last element.
Note: might return different results for different runs, unless the underlying collection type is ordered.
returns
the last element of this immutable champ hash map$ if it is nonempty, None if it is empty.
Definition Classes
IterableOps
def lazyZip[B](that: collection.Iterable[B]): LazyZip2[(K, V), B, HashMap.this.type]
Analogous to zip except that the elements in each collection are not consumed until a strict operation is invoked on the returned LazyZip2 decorator.
Analogous to zip except that the elements in each collection are not consumed until a strict operation is invoked on the returned LazyZip2 decorator.
Calls to lazyZip can be chained to support higher arities (up to 4) without incurring the expense of constructing and deconstructing intermediary tuples.
```
val xs = List(1, 2, 3)
val res = (xs lazyZip xs lazyZip xs lazyZip xs).map((a, b, c, d) => a + b + c + d)
// res == List(4, 8, 12)
```
B
the type of the second element in each eventual pair
that
the iterable providing the second element of each eventual pair
returns
a decorator LazyZip2 that allows strict operations to be performed on the lazily evaluated pairs or chained calls to lazyZip. Implicit conversion to Iterable[(A, B)] is also supported.
Definition Classes
Iterable
def lift: (K) => Option[V]
Turns this partial function into a plain function returning an Option result.
Turns this partial function into a plain function returning an Option result.
returns
a function that takes an argument x to Some(this(x)) if this is defined for x, and to None otherwise.
Definition Classes
PartialFunction
See also
Function.unlift
def map[K2, V2](f: ((K, V)) => (K2, V2)): HashMap[K2, V2]
Builds a new map by applying a function to all elements of this immutable champ hash map.
Builds a new map by applying a function to all elements of this immutable champ hash map.
f
the function to apply to each element.
returns
a new immutable champ hash map resulting from applying the given function f to each element of this immutable champ hash map and collecting the results.
Definition Classes
StrictOptimizedMapOps → MapOps
def map[B](f: ((K, V)) => B): Iterable[B]
Builds a new immutable champ hash map by applying a function to all elements of this immutable champ hash map.
Builds a new immutable champ hash map by applying a function to all elements of this immutable champ hash map.
B
the element type of the returned immutable champ hash map.
f
the function to apply to each element.
returns
a new immutable champ hash map resulting from applying the given function f to each element of this immutable champ hash map and collecting the results.
Definition Classes
StrictOptimizedIterableOps → IterableOps → IterableOnceOps
def mapFactory: MapFactory[HashMap]
The companion object of this map, providing various factory methods.
The companion object of this map, providing various factory methods.
Definition Classes
HashMap → Map → Map → MapOps
Note
When implementing a custom collection type and refining CC to the new type, this method needs to be overridden to return a factory for the new type (the compiler will issue an error otherwise).
final def mapFromIterable[K2, V2](it: collection.Iterable[(K2, V2)]): HashMap[K2, V2]
Similar to fromIterable, but returns a Map collection type.
Similar to fromIterable, but returns a Map collection type. Note that the return type is now CC[K2, V2].
Attributes
protected
Definition Classes
MapOps
Annotations
@inline()
def max[B >: (K, V)](implicit ord: math.Ordering[B]): (K, V)
Finds the largest element.
Finds the largest element.
Note: will not terminate for infinite-sized collections.
B
The type over which the ordering is defined.
ord
An ordering to be used for comparing elements.
returns
the largest element of this immutable champ hash map with respect to the ordering ord.
Definition Classes
IterableOnceOps
Exceptions thrown
UnsupportedOperationException if this immutable champ hash map is empty.
def maxBy[B](f: ((K, V)) => B)(implicit ord: math.Ordering[B]): (K, V)
Finds the first element which yields the largest value measured by function f.
Finds the first element which yields the largest value measured by function f.
Note: will not terminate for infinite-sized collections.
B
The result type of the function f.
f
The measuring function.
returns
the first element of this immutable champ hash map with the largest value measured by function f with respect to the ordering cmp.
Definition Classes
IterableOnceOps
Exceptions thrown
UnsupportedOperationException if this immutable champ hash map is empty.
def maxByOption[B](f: ((K, V)) => B)(implicit ord: math.Ordering[B]): Option[(K, V)]
Finds the first element which yields the largest value measured by function f.
Finds the first element which yields the largest value measured by function f.
Note: will not terminate for infinite-sized collections.
B
The result type of the function f.
f
The measuring function.
returns
an option value containing the first element of this immutable champ hash map with the largest value measured by function f with respect to the ordering cmp.
Definition Classes
IterableOnceOps
def maxOption[B >: (K, V)](implicit ord: math.Ordering[B]): Option[(K, V)]
Finds the largest element.
Finds the largest element.
Note: will not terminate for infinite-sized collections.
B
The type over which the ordering is defined.
ord
An ordering to be used for comparing elements.
returns
an option value containing the largest element of this immutable champ hash map with respect to the ordering ord.
Definition Classes
IterableOnceOps
def merged[V1 >: V](that: HashMap[K, V1])(mergef: ((K, V), (K, V1)) => (K, V1)): HashMap[K, V1]
Merges this HashMap with an other HashMap by combining all key-value pairs of both maps, and delegating to a merge function to resolve any key collisions between the two HashMaps.
Merges this HashMap with an other HashMap by combining all key-value pairs of both maps, and delegating to a merge function to resolve any key collisions between the two HashMaps.
that
the HashMap to merge this HashMap with
mergef
the merge function which resolves collisions between the two HashMaps. If mergef is null, then keys from this will overwrite keys from that, making the behaviour equivalent to that.concat(this)
Example:
1. val left = HashMap(1 -> 1, 2 -> 1) val right = HashMap(2 -> 2, 3 -> 2) val merged = left.merged(right){ case ((k0, v0), (k1, v1)) => (k0 + k1) -> (v0 + v1) } // HashMap(1 -> 1, 3 -> 2, 4 -> 3)
Note
In cases where mergef returns keys which themselves collide with other keys returned by merge, or found in this or that, it is not defined which value will be chosen. For example: Colliding multiple results of merging:
// key `3` collides between a result of merging keys `1` and `2` val left = HashMap(1 -> 1, 2 -> 2) val right = HashMap(1 -> 1, 2 -> 2) val merged = left.merged(right){ case (_, (_, v1)) => 3 -> v1 } // HashMap(3 -> 2) is returned, but it could also have returned HashMap(3 -> 1)
Colliding results of merging with other keys:
// key `2` collides between a result of merging `1`, and existing key `2` val left = HashMap(1 -> 1, 2 -> 1) val right = HashMap(1 -> 2) val merged = left.merged(right)((_,_) => 2 -> 3) // HashMap(2 -> 1) is returned, but it could also have returned HashMap(2 -> 3)
def min[B >: (K, V)](implicit ord: math.Ordering[B]): (K, V)
Finds the smallest element.
Finds the smallest element.
Note: will not terminate for infinite-sized collections.
B
The type over which the ordering is defined.
ord
An ordering to be used for comparing elements.
returns
the smallest element of this immutable champ hash map with respect to the ordering ord.
Definition Classes
IterableOnceOps
Exceptions thrown
UnsupportedOperationException if this immutable champ hash map is empty.
def minBy[B](f: ((K, V)) => B)(implicit ord: math.Ordering[B]): (K, V)
Finds the first element which yields the smallest value measured by function f.
Finds the first element which yields the smallest value measured by function f.
Note: will not terminate for infinite-sized collections.
B
The result type of the function f.
f
The measuring function.
returns
the first element of this immutable champ hash map with the smallest value measured by function f with respect to the ordering cmp.
Definition Classes
IterableOnceOps
Exceptions thrown
UnsupportedOperationException if this immutable champ hash map is empty.
def minByOption[B](f: ((K, V)) => B)(implicit ord: math.Ordering[B]): Option[(K, V)]
Finds the first element which yields the smallest value measured by function f.
Finds the first element which yields the smallest value measured by function f.
Note: will not terminate for infinite-sized collections.
B
The result type of the function f.
f
The measuring function.
returns
an option value containing the first element of this immutable champ hash map with the smallest value measured by function f with respect to the ordering cmp.
Definition Classes
IterableOnceOps
def minOption[B >: (K, V)](implicit ord: math.Ordering[B]): Option[(K, V)]
Finds the smallest element.
Finds the smallest element.
Note: will not terminate for infinite-sized collections.
B
The type over which the ordering is defined.
ord
An ordering to be used for comparing elements.
returns
an option value containing the smallest element of this immutable champ hash map with respect to the ordering ord.
Definition Classes
IterableOnceOps
final def mkString: String
Displays all elements of this immutable champ hash map in a string.
Displays all elements of this immutable champ hash map in a string.
Delegates to addString, which can be overridden.
returns
a string representation of this immutable champ hash map. In the resulting string the string representations (w.r.t. the method toString) of all elements of this immutable champ hash map follow each other without any separator string.
Definition Classes
IterableOnceOps
Annotations
@inline()
final def mkString(sep: String): String
Displays all elements of this immutable champ hash map in a string using a separator string.
Displays all elements of this immutable champ hash map in a string using a separator string.
Delegates to addString, which can be overridden.
sep
the separator string.
returns
a string representation of this immutable champ hash map. In the resulting string the string representations (w.r.t. the method toString) of all elements of this immutable champ hash map are separated by the string sep.
Definition Classes
IterableOnceOps
Annotations
@inline()
Example:
1. List(1, 2, 3).mkString("|") = "1|2|3"
final def mkString(start: String, sep: String, end: String): String
Displays all elements of this immutable champ hash map in a string using start, end, and separator strings.
Displays all elements of this immutable champ hash map in a string using start, end, and separator strings.
Delegates to addString, which can be overridden.
start
the starting string.
sep
the separator string.
end
the ending string.
returns
a string representation of this immutable champ hash map. The resulting string begins with the string start and ends with the string end. Inside, the string representations (w.r.t. the method toString) of all elements of this immutable champ hash map are separated by the string sep.
Definition Classes
IterableOnceOps
Example:
1. List(1, 2, 3).mkString("(", "; ", ")") = "(1; 2; 3)"
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
def newSpecificBuilder: Builder[(K, V), HashMap[K, V]]
returns
a strict builder for the same collection type. Note that in the case of lazy collections (e.g. scala.collection.View or scala.collection.immutable.LazyList), it is possible to implement this method but the resulting Builder will break laziness. As a consequence, operations should preferably be implemented with fromSpecific instead of this method.
Attributes
protected
Definition Classes
MapFactoryDefaults → IterableOps
Note
When implementing a custom collection type and refining C to the new type, this method needs to be overridden (the compiler will issue an error otherwise). In the common case where C =:= CC[A], this can be done by mixing in the scala.collection.IterableFactoryDefaults trait, which implements the method using iterableFactory.
,
As witnessed by the @uncheckedVariance annotation, using this method might be unsound. However, as long as the returned builder is only fed with A values taken from this instance, it is safe.
def nonEmpty: Boolean
Tests whether the immutable champ hash map is not empty.
Tests whether the immutable champ hash map is not empty.
returns
true if the immutable champ hash map contains at least one element, false otherwise.
Definition Classes
IterableOnceOps
Annotations
@deprecatedOverriding()
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
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
def orElse[A1 <: K, B1 >: V](that: PartialFunction[A1, B1]): PartialFunction[A1, B1]
Composes this partial function with a fallback partial function which gets applied where this partial function is not defined.
Composes this partial function with a fallback partial function which gets applied where this partial function is not defined.
A1
the argument type of the fallback function
B1
the result type of the fallback function
that
the fallback function
returns
a partial function which has as domain the union of the domains of this partial function and that. The resulting partial function takes x to this(x) where this is defined, and to that(x) where it is not.
Definition Classes
PartialFunction
def partition(p: ((K, V)) => Boolean): (HashMap[K, V], HashMap[K, V])
A pair of, first, all elements that satisfy predicate p and, second, all elements that do not.
A pair of, first, all elements that satisfy predicate p and, second, all elements that do not.
The two immutable champ hash map correspond to the result of filter and filterNot, respectively.
The default implementation provided here needs to traverse the collection twice. Strict collections have an overridden version of partition in StrictOptimizedIterableOps, which requires only a single traversal.
Definition Classes
HashMap → StrictOptimizedIterableOps → IterableOps
def partitionMap[A1, A2](f: ((K, V)) => Either[A1, A2]): (Iterable[A1], Iterable[A2])
Applies a function f to each element of the immutable champ hash map and returns a pair of immutable champ hash maps: the first one made of those values returned by f that were wrapped in scala.util.Left, and the second one made of those wrapped in scala.util.Right.
Applies a function f to each element of the immutable champ hash map and returns a pair of immutable champ hash maps: the first one made of those values returned by f that were wrapped in scala.util.Left, and the second one made of those wrapped in scala.util.Right.
Example:
```
val xs = `immutable.HashMap`(1, "one", 2, "two", 3, "three") partitionMap {
 case i: Int => Left(i)
 case s: String => Right(s)
}
// xs == (`immutable.HashMap`(1, 2, 3),
//        `immutable.HashMap`(one, two, three))
```
A1
the element type of the first resulting collection
A2
the element type of the second resulting collection
f
the 'split function' mapping the elements of this immutable champ hash map to an scala.util.Either
returns
a pair of immutable champ hash maps: the first one made of those values returned by f that were wrapped in scala.util.Left, and the second one made of those wrapped in scala.util.Right.
Definition Classes
StrictOptimizedIterableOps → IterableOps
def product[B >: (K, V)](implicit num: math.Numeric[B]): B
Multiplies together the elements of this collection.
Multiplies together the elements of this collection.
The default implementation uses reduce for a known non-empty collection, foldLeft otherwise.
Note: will not terminate for infinite-sized collections.
B
the result type of the * operator.
num
an implicit parameter defining a set of numeric operations which includes the * operator to be used in forming the product.
returns
the product of all elements of this immutable champ hash map with respect to the * operator in num.
Definition Classes
IterableOnceOps
def reduce[B >: (K, V)](op: (B, B) => B): B
Applies the given binary operator op to all elements of this immutable champ hash map.
Applies the given binary operator op to all elements of this immutable champ hash map.
For each application of the operator, each operand is either an element of this immutable champ hash map or another such application of the operator. The order of applications of the operator is unspecified and may be nondeterministic. Each element appears exactly once in the computation.
If this collection is ordered, then for any application of the operator, the element(s) appearing in the left operand will precede those in the right.
Note: might return different results for different runs, unless either of the following conditions is met: (1) the operator is associative, and the underlying collection type is ordered; or (2) the operator is associative and commutative.
Note: will not terminate for infinite-sized collections.
B
The type parameter for the binary operator, a supertype of A.
op
A binary operator; must be associative for the result to always be the same across runs.
returns
The result of applying op between all the elements if the immutable champ hash map is nonempty.
Definition Classes
IterableOnceOps
Exceptions thrown
UnsupportedOperationException if this immutable champ hash map is empty.
def reduceLeft[B >: (K, V)](op: (B, (K, V)) => B): B
Applies the given binary operator op to all elements of this immutable champ hash map, going left to right.
Applies the given binary operator op to all elements of this immutable champ hash map, going left to right.
"Going left to right" only makes sense if this collection is ordered: then if x₁, x₂, ..., x_n are the elements of this immutable champ hash map, the result is op( op( op( ... op(x₁, x₂) ... ), x_n-1), x_n).
If this collection is not ordered, then for each application of the operator, each right operand is an element. In addition, the leftmost operand is the first element of this immutable champ hash map and each other left operand is itself an application of the operator. Each element appears exactly once in the computation.
Note: might return different results for different runs, unless the underlying collection type is ordered or the operator is associative and commutative.
Note: will not terminate for infinite-sized collections.
B
The result type of the binary operator, a supertype of A.
op
A binary operator.
returns
The result of applying op to all elements of this immutable champ hash map, going left to right.
Definition Classes
IterableOnceOps
Exceptions thrown
UnsupportedOperationException if this immutable champ hash map is empty.
def reduceLeftOption[B >: (K, V)](op: (B, (K, V)) => B): Option[B]
If this immutable champ hash map is nonempty, reduces it with the given binary operator op, going left to right.
If this immutable champ hash map is nonempty, reduces it with the given binary operator op, going left to right.
The behavior is the same as reduceLeft except that the value is None if the immutable champ hash map is empty. Each element appears exactly once in the computation.
Note: might return different results for different runs, unless the underlying collection type is ordered or the operator is associative and commutative.
Note: will not terminate for infinite-sized collections.
B
The result type of the binary operator, a supertype of A.
op
A binary operator.
returns
The result of reducing this immutable champ hash map with op going left to right if the immutable champ hash map is nonempty, inside a Some, and None otherwise.
Definition Classes
IterableOnceOps
def reduceOption[B >: (K, V)](op: (B, B) => B): Option[B]
If this immutable champ hash map is nonempty, reduces it with the given binary operator op.
If this immutable champ hash map is nonempty, reduces it with the given binary operator op.
The behavior is the same as reduce except that the value is None if the immutable champ hash map is empty. The order of applications of the operator is unspecified and may be nondeterministic. Each element appears exactly once in the computation.
Note: might return different results for different runs, unless either of the following conditions is met: (1) the operator is associative, and the underlying collection type is ordered; or (2) the operator is associative and commutative.
Note: will not terminate for infinite-sized collections.
B
A type parameter for the binary operator, a supertype of A.
op
A binary operator; must be associative for the result to always be the same across runs.
returns
The result of reducing this immutable champ hash map with op if the immutable champ hash map is nonempty, inside a Some, and None otherwise.
Definition Classes
IterableOnceOps
def reduceRight[B >: (K, V)](op: ((K, V), B) => B): B
Applies the given binary operator op to all elements of this immutable champ hash map, going right to left.
Applies the given binary operator op to all elements of this immutable champ hash map, going right to left.
"Going right to left" only makes sense if this collection is ordered: then if x₁, x₂, ..., x_n are the elements of this immutable champ hash map, the result is op(x₁, op(x₂, op( ... op(x_n-1, x_n) ... ))).
If this collection is not ordered, then for each application of the operator, each left operand is an element. In addition, the rightmost operand is the last element of this immutable champ hash map and each other right operand is itself an application of the operator. Each element appears exactly once in the computation.
Note: might return different results for different runs, unless the underlying collection type is ordered or the operator is associative and commutative.
Note: will not terminate for infinite-sized collections.
B
The result type of the binary operator, a supertype of A.
op
A binary operator.
returns
The result of applying op to all elements of this immutable champ hash map, going right to left.
Definition Classes
IterableOnceOps
Exceptions thrown
UnsupportedOperationException if this immutable champ hash map is empty.
def reduceRightOption[B >: (K, V)](op: ((K, V), B) => B): Option[B]
If this immutable champ hash map is nonempty, reduces it with the given binary operator op, going right to left.
If this immutable champ hash map is nonempty, reduces it with the given binary operator op, going right to left.
The behavior is the same as reduceRight except that the value is None if the immutable champ hash map is empty. Each element appears exactly once in the computation.
Note: might return different results for different runs, unless the underlying collection type is ordered or the operator is associative and commutative.
Note: will not terminate for infinite-sized collections.
B
The result type of the binary operator, a supertype of A.
op
A binary operator.
returns
The result of reducing this immutable champ hash map with op going right to left if the immutable champ hash map is nonempty, inside a Some, and None otherwise.
Definition Classes
IterableOnceOps
def removed(key: K): HashMap[K, V]
Removes a key from this map, returning a new map.
Removes a key from this map, returning a new map.
key
the key to be removed
returns
a new map without a binding for key
Definition Classes
HashMap → MapOps
def removedAll(keys: scala.IterableOnce[K]): HashMap[K, V]
Creates a new immutable champ hash map from this immutable champ hash map by removing all elements of another collection.
Creates a new immutable champ hash map from this immutable champ hash map by removing all elements of another collection.
Note: Even when applied to a view or a lazy collection it will always force the elements.
keys
the collection containing the removed elements.
returns
a new immutable champ hash map that contains all elements of the current immutable champ hash map except one less occurrence of each of the elements of elems.
Definition Classes
HashMap → MapOps
def reverseIterator: Iterator[(K, V)]
Attributes
protected[immutable]
def reversed: collection.Iterable[(K, V)]
Attributes
protected
Definition Classes
IterableOnceOps
def runWith[U](action: (V) => U): (K) => Boolean
Composes this partial function with an action function which gets applied to results of this partial function.
Composes this partial function with an action function which gets applied to results of this partial function. The action function is invoked only for its side effects; its result is ignored.
Note that expression pf.runWith(action)(x) is equivalent to
```
if(pf isDefinedAt x) { action(pf(x)); true } else false
```
except that runWith is implemented via applyOrElse and thus potentially more efficient. Using runWith avoids double evaluation of pattern matchers and guards for partial function literals.
action
the action function
returns
a function which maps arguments x to isDefinedAt(x). The resulting function runs action(this(x)) where this is defined.
Definition Classes
PartialFunction
See also
applyOrElse.
def scan[B >: (K, V)](z: B)(op: (B, B) => B): Iterable[B]
Computes a prefix scan of the elements of the collection.
Computes a prefix scan of the elements of the collection.
Note: The neutral element z may be applied more than once.
B
element type of the resulting collection
z
neutral element for the operator op
op
the associative operator for the scan
returns
a new immutable champ hash map containing the prefix scan of the elements in this immutable champ hash map
Definition Classes
IterableOps
def scanLeft[B](z: B)(op: (B, (K, V)) => B): Iterable[B]
Produces a immutable champ hash map containing cumulative results of applying the operator going left to right, including the initial value.
Produces a immutable champ hash map containing cumulative results of applying the operator going left to right, including the initial value.
Note: will not terminate for infinite-sized collections.
Note: might return different results for different runs, unless the underlying collection type is ordered.
B
the type of the elements in the resulting collection
z
the initial value
op
the binary operator applied to the intermediate result and the element
returns
collection with intermediate results
Definition Classes
StrictOptimizedIterableOps → IterableOps → IterableOnceOps
def scanRight[B](z: B)(op: ((K, V), B) => B): Iterable[B]
Produces a collection containing cumulative results of applying the operator going right to left.
Produces a collection containing cumulative results of applying the operator going right to left. The head of the collection is the last cumulative result.
Note: will not terminate for infinite-sized collections.
Note: might return different results for different runs, unless the underlying collection type is ordered.
Note: Even when applied to a view or a lazy collection it will always force the elements.
Example:
```
List(1, 2, 3, 4).scanRight(0)(_ + _) == List(10, 9, 7, 4, 0)
```
B
the type of the elements in the resulting collection
z
the initial value
op
the binary operator applied to the intermediate result and the element
returns
collection with intermediate results
Definition Classes
IterableOps
def size: Int
The size of this immutable champ hash map.
The size of this immutable champ hash map.
Note: will not terminate for infinite-sized collections.
returns
the number of elements in this immutable champ hash map.
Definition Classes
HashMap → IterableOnceOps
def sizeCompare(that: collection.Iterable[_]): Int
Compares the size of this immutable champ hash map to the size of another Iterable.
Compares the size of this immutable champ hash map to the size of another Iterable.
that
the Iterable whose size is compared with this immutable champ hash map's size.
returns
A value x where
```
x <  0       if this.size <  that.size
x == 0       if this.size == that.size
x >  0       if this.size >  that.size
```
The method as implemented here does not call size directly; its running time is O(this.size min that.size) instead of O(this.size + that.size). The method should be overridden if computing size is cheap and knownSize returns -1.
Definition Classes
IterableOps
def sizeCompare(otherSize: Int): Int
Compares the size of this immutable champ hash map to a test value.
Compares the size of this immutable champ hash map to a test value.
otherSize
the test value that gets compared with the size.
returns
A value x where
```
x <  0       if this.size <  otherSize
x == 0       if this.size == otherSize
x >  0       if this.size >  otherSize
```
The method as implemented here does not call size directly; its running time is O(size min otherSize) instead of O(size). The method should be overridden if computing size is cheap and knownSize returns -1.
Definition Classes
IterableOps
See also
sizeIs
final def sizeIs: SizeCompareOps
Returns a value class containing operations for comparing the size of this immutable champ hash map to a test value.
Returns a value class containing operations for comparing the size of this immutable champ hash map to a test value.
These operations are implemented in terms of sizeCompare(Int), and allow the following more readable usages:
```
this.sizeIs < size     // this.sizeCompare(size) < 0
this.sizeIs <= size    // this.sizeCompare(size) <= 0
this.sizeIs == size    // this.sizeCompare(size) == 0
this.sizeIs != size    // this.sizeCompare(size) != 0
this.sizeIs >= size    // this.sizeCompare(size) >= 0
this.sizeIs > size     // this.sizeCompare(size) > 0
```
Definition Classes
IterableOps
Annotations
@inline()
def slice(from: Int, until: Int): HashMap[K, V]
Selects an interval of elements.
Selects an interval of elements. The returned immutable champ hash map is made up of all elements x which satisfy the invariant:
```
from <= indexOf(x) < until
```
Note: might return different results for different runs, unless the underlying collection type is ordered.
from
the lowest index to include from this immutable champ hash map.
until
the lowest index to EXCLUDE from this immutable champ hash map.
returns
a immutable champ hash map containing the elements greater than or equal to index from extending up to (but not including) index until of this immutable champ hash map.
Definition Classes
IterableOps → IterableOnceOps
def sliding(size: Int, step: Int): Iterator[HashMap[K, V]]
Groups elements in fixed size blocks by passing a "sliding window" over them (as opposed to partitioning them, as is done in grouped).
Groups elements in fixed size blocks by passing a "sliding window" over them (as opposed to partitioning them, as is done in grouped).
The returned iterator will be empty when called on an empty collection. The last element the iterator produces may be smaller than the window size when the original collection isn't exhausted by the window before it and its last element isn't skipped by the step before it.
size
the number of elements per group
step
the distance between the first elements of successive groups
returns
An iterator producing immutable champ hash maps of size size, except the last element (which may be the only element) will be smaller if there are fewer than size elements remaining to be grouped.
Definition Classes
IterableOps
Examples:
1. List(1, 2, 3, 4, 5).sliding(2, 2) = Iterator(List(1, 2), List(3, 4), List(5))
2. List(1, 2, 3, 4, 5, 6).sliding(2, 3) = Iterator(List(1, 2), List(4, 5))
See also
scala.collection.Iterator, method sliding
def sliding(size: Int): Iterator[HashMap[K, V]]
Groups elements in fixed size blocks by passing a "sliding window" over them (as opposed to partitioning them, as is done in grouped).
Groups elements in fixed size blocks by passing a "sliding window" over them (as opposed to partitioning them, as is done in grouped).
An empty collection returns an empty iterator, and a non-empty collection containing fewer elements than the window size returns an iterator that will produce the original collection as its only element.
size
the number of elements per group
returns
An iterator producing immutable champ hash maps of size size, except for a non-empty collection with less than size elements, which returns an iterator that produces the source collection itself as its only element.
Definition Classes
IterableOps
Examples:
1. List().sliding(2) = empty iterator
2. List(1).sliding(2) = Iterator(List(1))
3. List(1, 2).sliding(2) = Iterator(List(1, 2))
4. List(1, 2, 3).sliding(2) = Iterator(List(1, 2), List(2, 3))
See also
scala.collection.Iterator, method sliding
def span(p: ((K, V)) => Boolean): (HashMap[K, V], HashMap[K, V])
Splits this immutable champ hash map into a prefix/suffix pair according to a predicate.
Splits this immutable champ hash map into a prefix/suffix pair according to a predicate.
Note: c span p is equivalent to (but possibly more efficient than) (c takeWhile p, c dropWhile p), provided the evaluation of the predicate p does not cause any side-effects.
Note: might return different results for different runs, unless the underlying collection type is ordered.
p
the test predicate
returns
a pair consisting of the longest prefix of this immutable champ hash map whose elements all satisfy p, and the rest of this immutable champ hash map.
Definition Classes
HashMap → StrictOptimizedIterableOps → IterableOps → IterableOnceOps
def splitAt(n: Int): (HashMap[K, V], HashMap[K, V])
Splits this immutable champ hash map into a prefix/suffix pair at a given position.
Splits this immutable champ hash map into a prefix/suffix pair at a given position.
Note: c splitAt n is equivalent to (but possibly more efficient than) (c take n, c drop n).
Note: might return different results for different runs, unless the underlying collection type is ordered.
n
the position at which to split.
returns
a pair of immutable champ hash maps consisting of the first n elements of this immutable champ hash map, and the other elements.
Definition Classes
IterableOps → IterableOnceOps
def stepper[S <: Stepper[_]](implicit shape: StepperShape[(K, V), S]): S with EfficientSplit
Returns a scala.collection.Stepper for the elements of this collection.
Returns a scala.collection.Stepper for the elements of this collection.
The Stepper enables creating a Java stream to operate on the collection, see scala.jdk.StreamConverters. For collections holding primitive values, the Stepper can be used as an iterator which doesn't box the elements.
The implicit scala.collection.StepperShape parameter defines the resulting Stepper type according to the element type of this collection.
- For collections of Int, Short, Byte or Char, an scala.collection.IntStepper is returned
- For collections of Double or Float, a scala.collection.DoubleStepper is returned
- For collections of Long a scala.collection.LongStepper is returned
- For any other element type, an scala.collection.AnyStepper is returned
Note that this method is overridden in subclasses and the return type is refined to S with EfficientSplit, for example scala.collection.IndexedSeqOps.stepper. For Steppers marked with scala.collection.Stepper.EfficientSplit, the converters in scala.jdk.StreamConverters allow creating parallel streams, whereas bare Steppers can be converted only to sequential streams.
Definition Classes
HashMap → IterableOnce
final def strictOptimizedCollect[B, C2](b: Builder[B, C2], pf: PartialFunction[(K, V), B]): C2
B
Type of elements of the resulting collection (e.g. String)
C2
Type of the resulting collection (e.g. List[String])
b
Builder to use to build the resulting collection
pf
Element transformation partial function
returns
The resulting collection
Attributes
protected[this]
Definition Classes
StrictOptimizedIterableOps
Annotations
@inline()
final def strictOptimizedConcat[B >: (K, V), C2](that: IterableOnce[B], b: Builder[B, C2]): C2
B
Type of elements of the resulting collections (e.g. Int)
C2
Type of the resulting collection (e.g. List[Int])
that
Elements to concatenate to this collection
b
Builder to use to build the resulting collection
returns
The resulting collection
Attributes
protected[this]
Definition Classes
StrictOptimizedIterableOps
Annotations
@inline()
final def strictOptimizedFlatMap[B, C2](b: Builder[B, C2], f: ((K, V)) => IterableOnce[B]): C2
B
Type of elements of the resulting collection (e.g. String)
C2
Type of the resulting collection (e.g. List[String])
b
Builder to use to build the resulting collection
f
Element transformation function
returns
The resulting collection
Attributes
protected[this]
Definition Classes
StrictOptimizedIterableOps
Annotations
@inline()
final def strictOptimizedFlatten[B, C2](b: Builder[B, C2])(implicit toIterableOnce: ((K, V)) => IterableOnce[B]): C2
B
Type of elements of the resulting collection (e.g. Int)
C2
Type of the resulting collection (e.g. List[Int])
b
Builder to use to build the resulting collection
toIterableOnce
Evidence that A can be seen as an IterableOnce[B]
returns
The resulting collection
Attributes
protected[this]
Definition Classes
StrictOptimizedIterableOps
Annotations
@inline()
final def strictOptimizedMap[B, C2](b: Builder[B, C2], f: ((K, V)) => B): C2
B
Type of elements of the resulting collection (e.g. String)
C2
Type of the resulting collection (e.g. List[String])
b
Builder to use to build the resulting collection
f
Element transformation function
returns
The resulting collection
Attributes
protected[this]
Definition Classes
StrictOptimizedIterableOps
Annotations
@inline()
final def strictOptimizedZip[B, C2](that: IterableOnce[B], b: Builder[((K, V), B), C2]): C2
B
Type of elements of the second collection (e.g. String)
C2
Type of the resulting collection (e.g. List[(Int, String)])
that
Collection to zip with this collection
b
Builder to use to build the resulting collection
returns
The resulting collection
Attributes
protected[this]
Definition Classes
StrictOptimizedIterableOps
Annotations
@inline()
def stringPrefix: String
Attributes
protected[this]
Definition Classes
Map → Iterable
Annotations
@nowarn()
def sum[B >: (K, V)](implicit num: math.Numeric[B]): B
Sums the elements of this collection.
Sums the elements of this collection.
The default implementation uses reduce for a known non-empty collection, foldLeft otherwise.
Note: will not terminate for infinite-sized collections.
B
the result type of the + operator.
num
an implicit parameter defining a set of numeric operations which includes the + operator to be used in forming the sum.
returns
the sum of all elements of this immutable champ hash map with respect to the + operator in num.
Definition Classes
IterableOnceOps
final def synchronized[T0](arg0: => T0): T0
Executes the code in body with an exclusive lock on this.
Executes the code in body with an exclusive lock on this.
returns
the result of body
Definition Classes
AnyRef
def tail: HashMap[K, V]
The rest of the collection without its first element.
The rest of the collection without its first element.
Definition Classes
HashMap → IterableOps
def tails: Iterator[HashMap[K, V]]
Iterates over the tails of this immutable champ hash map.
Iterates over the tails of this immutable champ hash map. The first value will be this immutable champ hash map and the final one will be an empty immutable champ hash map, with the intervening values the results of successive applications of tail.
returns
an iterator over all the tails of this immutable champ hash map
Definition Classes
IterableOps
Example:
1. List(1,2,3).tails = Iterator(List(1,2,3), List(2,3), List(3), Nil)
def take(n: Int): HashMap[K, V]
Selects the first n elements.
Selects the first n elements.
Note: might return different results for different runs, unless the underlying collection type is ordered.
n
the number of elements to take from this immutable champ hash map.
returns
a immutable champ hash map consisting only of the first n elements of this immutable champ hash map, or else the whole immutable champ hash map, if it has less than n elements. If n is negative, returns an empty immutable champ hash map.
Definition Classes
HashMap → IterableOps → IterableOnceOps
def takeRight(n: Int): HashMap[K, V]
A collection containing the last n elements of this collection.
A collection containing the last n elements of this collection.
Note: Even when applied to a view or a lazy collection it will always force the elements.
n
the number of elements to take from this immutable champ hash map.
returns
a immutable champ hash map consisting only of the last n elements of this immutable champ hash map, or else the whole immutable champ hash map, if it has less than n elements. If n is negative, returns an empty immutable champ hash map.
Definition Classes
HashMap → StrictOptimizedIterableOps → IterableOps
def takeWhile(p: ((K, V)) => Boolean): HashMap[K, V]
Takes longest prefix of elements that satisfy a predicate.
Takes longest prefix of elements that satisfy a predicate.
Note: might return different results for different runs, unless the underlying collection type is ordered.
p
The predicate used to test elements.
returns
the longest prefix of this immutable champ hash map whose elements all satisfy the predicate p.
Definition Classes
HashMap → IterableOps → IterableOnceOps
def tapEach[U](f: ((K, V)) => U): HashMap[K, V]
Applies a side-effecting function to each element in this collection.
Applies a side-effecting function to each element in this collection. Strict collections will apply f to their elements immediately, while lazy collections like Views and LazyLists will only apply f on each element if and when that element is evaluated, and each time that element is evaluated.
U
the return type of f
f
a function to apply to each element in this immutable champ hash map
returns
The same logical collection as this
Definition Classes
StrictOptimizedIterableOps → IterableOps → IterableOnceOps
def to[C1](factory: Factory[(K, V), C1]): C1
Given a collection factory factory, converts this immutable champ hash map to the appropriate representation for the current element type A.
Given a collection factory factory, converts this immutable champ hash map to the appropriate representation for the current element type A. Example uses:
```
xs.to(List)
xs.to(ArrayBuffer)
xs.to(BitSet) // for xs: Iterable[Int]
```
Definition Classes
IterableOnceOps
def toArray[B >: (K, V)](implicit arg0: ClassTag[B]): Array[B]
Converts this immutable champ hash map to an Array.
Converts this immutable champ hash map to an Array.
Implementation note: DO NOT call Array.from from this method.
B
The type of elements of the result, a supertype of A.
returns
This immutable champ hash map as an Array[B].
Definition Classes
IterableOnceOps
final def toBuffer[B >: (K, V)]: Buffer[B]
Converts this immutable champ hash map to a Buffer.
Converts this immutable champ hash map to a Buffer.
B
The type of elements of the result, a supertype of A.
returns
This immutable champ hash map as a Buffer[B].
Definition Classes
IterableOnceOps
Annotations
@inline()
def toIndexedSeq: IndexedSeq[(K, V)]
Converts this immutable champ hash map to an IndexedSeq.
Converts this immutable champ hash map to an IndexedSeq.
returns
This immutable champ hash map as an IndexedSeq[A].
Definition Classes
IterableOnceOps
def toList: List[(K, V)]
Converts this immutable champ hash map to a List.
Converts this immutable champ hash map to a List.
returns
This immutable champ hash map as a List[A].
Definition Classes
IterableOnceOps
final def toMap[K2, V2](implicit ev: <:<[(K, V), (K2, V2)]): Map[K2, V2]
Converts this immutable champ hash map to a Map, given an implicit coercion from the immutable champ hash map's type to a key-value tuple.
Converts this immutable champ hash map to a Map, given an implicit coercion from the immutable champ hash map's type to a key-value tuple.
ev
An implicit coercion from A to [K, V].
returns
This immutable champ hash map as a Map[K, V].
Definition Classes
Map → IterableOnceOps
def toSeq: Seq[(K, V)]
returns
This immutable champ hash map as a Seq[A]. This is equivalent to to(Seq) but might be faster.
Definition Classes
IterableOnceOps
def toSet[B >: (K, V)]: Set[B]
Converts this immutable champ hash map to a Set.
Converts this immutable champ hash map to a Set.
B
The type of elements of the result, a supertype of A.
returns
This immutable champ hash map as a Set[B].
Definition Classes
IterableOnceOps
def toString(): String
Creates a String representation of this object.
Creates a String representation of this object. The default representation is platform dependent. On the java platform it is the concatenation of the class name, "@", and the object's hashcode in hexadecimal.
returns
a String representation of the object.
Definition Classes
Map → Function1 → Iterable → AnyRef → Any
def toVector: Vector[(K, V)]
Converts this immutable champ hash map to a Vector.
Converts this immutable champ hash map to a Vector.
returns
This immutable champ hash map as a Vector[A].
Definition Classes
IterableOnceOps
def transform[W](f: (K, V) => W): HashMap[K, W]
This function transforms all the values of mappings contained in this map with function f.
This function transforms all the values of mappings contained in this map with function f.
f
A function over keys and values
returns
the updated map
Definition Classes
HashMap → MapOps
def transpose[B](implicit asIterable: ((K, V)) => collection.Iterable[B]): Iterable[Iterable[B]]
Transposes this immutable champ hash map of iterable collections into a immutable champ hash map of immutable champ hash maps.
Transposes this immutable champ hash map of iterable collections into a immutable champ hash map of immutable champ hash maps.
The resulting collection's type will be guided by the static type of immutable champ hash map. For example:
```
val xs = List(
           Set(1, 2, 3),
           Set(4, 5, 6)).transpose
// xs == List(
//         List(1, 4),
//         List(2, 5),
//         List(3, 6))

val ys = Vector(
           List(1, 2, 3),
           List(4, 5, 6)).transpose
// ys == Vector(
//         Vector(1, 4),
//         Vector(2, 5),
//         Vector(3, 6))
```
Note: Even when applied to a view or a lazy collection it will always force the elements.
B
the type of the elements of each iterable collection.
asIterable
an implicit conversion which asserts that the element type of this immutable champ hash map is an Iterable.
returns
a two-dimensional immutable champ hash map of immutable champ hash maps which has as nth row the nth column of this immutable champ hash map.
Definition Classes
IterableOps
Exceptions thrown
IllegalArgumentException if all collections in this immutable champ hash map are not of the same size.
def unapply(a: K): Option[V]
Tries to extract a B from an A in a pattern matching expression.
Tries to extract a B from an A in a pattern matching expression.
Definition Classes
PartialFunction
def unlift: PartialFunction[K, B]
Converts an optional function to a partial function.
Converts an optional function to a partial function.
Implicit
This member is added by an implicit conversion from HashMap[K, V] toUnliftOps[K, B] performed by method UnliftOps in scala.Function1.This conversion will take place only if V is a subclass of Option[B] (V <: Option[B]).
Definition Classes
UnliftOps
Example:
1. Unlike Function.unlift, this UnliftOps.unlift method can be used in extractors.
  val of: Int => Option[String] = { i => if (i == 2) { Some("matched by an optional function") } else { None } } util.Random.nextInt(4) match { case of.unlift(m) => // Convert an optional function to a pattern println(m) case _ => println("Not matched") }
def unzip[A1, A2](implicit asPair: ((K, V)) => (A1, A2)): (Iterable[A1], Iterable[A2])
Converts this immutable champ hash map of pairs into two collections of the first and second half of each pair.
Converts this immutable champ hash map of pairs into two collections of the first and second half of each pair.
```
val xs = `immutable.HashMap`(
           (1, "one"),
           (2, "two"),
           (3, "three")).unzip
// xs == (`immutable.HashMap`(1, 2, 3),
//        `immutable.HashMap`(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 immutable champ hash map is a pair.
returns
a pair of immutable champ hash maps, containing the first, respectively second half of each element pair of this immutable champ hash map.
Definition Classes
StrictOptimizedIterableOps → IterableOps
def unzip3[A1, A2, A3](implicit asTriple: ((K, V)) => (A1, A2, A3)): (Iterable[A1], Iterable[A2], Iterable[A3])
Converts this immutable champ hash map of triples into three collections of the first, second, and third element of each triple.
Converts this immutable champ hash map of triples into three collections of the first, second, and third element of each triple.
```
val xs = `immutable.HashMap`(
           (1, "one", '1'),
           (2, "two", '2'),
           (3, "three", '3')).unzip3
// xs == (`immutable.HashMap`(1, 2, 3),
//        `immutable.HashMap`(one, two, three),
//        `immutable.HashMap`(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 immutable champ hash map is a triple.
returns
a triple of immutable champ hash maps, containing the first, second, respectively third member of each element triple of this immutable champ hash map.
Definition Classes
StrictOptimizedIterableOps → IterableOps
def updated[V1 >: V](key: K, value: V1): HashMap[K, V1]
Creates a new map obtained by updating this map with a given key/value pair.
Creates a new map obtained by updating this map with a given key/value pair.
V1
the type of the added value
key
the key
value
the value
returns
A new map with the new key/value mapping added to this map.
Definition Classes
HashMap → MapOps
def updatedWith[V1 >: V](key: K)(remappingFunction: (Option[V]) => Option[V1]): HashMap[K, V1]
Update a mapping for the specified key and its current optionally mapped value (Some if there is current mapping, None if not).
Update a mapping for the specified key and its current optionally mapped value (Some if there is current mapping, None if not).
If the remapping function returns Some(v), the mapping is updated with the new value v. If the remapping function returns None, the mapping is removed (or remains absent if initially absent). If the function itself throws an exception, the exception is rethrown, and the current mapping is left unchanged.
key
the key value
remappingFunction
a function that receives current optionally mapped value and return a new mapping
returns
A new map with the updated mapping with the key
Definition Classes
HashMap → MapOps
def valueStepper[S <: Stepper[_]](implicit shape: StepperShape[V, S]): S with EfficientSplit
Returns a Stepper for the values of this map.
Returns a Stepper for the values of this map. See method stepper.
Definition Classes
HashMap → MapOps
def values: collection.Iterable[V]
Collects all values of this map in an iterable collection.
Collects all values of this map in an iterable collection.
returns
the values of this map as an iterable.
Definition Classes
MapOps
def valuesIterator: Iterator[V]
Creates an iterator for all values in this map.
Creates an iterator for all values in this map.
returns
an iterator over all values that are associated with some key in this map.
Definition Classes
HashMap → MapOps
def view: MapView[K, V]
A view over the elements of this collection.
A view over the elements of this collection.
Definition Classes
MapOps → IterableOps
final def wait(): Unit
See https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#wait--.
See https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#wait--.
Definition Classes
AnyRef
Annotations
@throws(classOf[java.lang.InterruptedException])
Note
not specified by SLS as a member of AnyRef
final def wait(arg0: Long, arg1: Int): Unit
See https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#wait-long-int-
See https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#wait-long-int-
Definition Classes
AnyRef
Annotations
@throws(classOf[java.lang.InterruptedException])
Note
not specified by SLS as a member of AnyRef
final def wait(arg0: Long): Unit
See https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#wait-long-.
See https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#wait-long-.
Definition Classes
AnyRef
Annotations
@throws(classOf[java.lang.InterruptedException]) @native()
Note
not specified by SLS as a member of AnyRef
def withDefault[V1 >: V](d: (K) => V1): Map[K, V1]
The same map with a given default function.
The same map with a given default function. Note: The default is only used for apply. Other methods like get, contains, iterator, keys, etc. are not affected by withDefault.
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
def withDefaultValue[V1 >: V](d: V1): Map[K, V1]
The same map with a given default value.
The same map with a given default value. Note: The default is only used for apply. Other methods like get, contains, iterator, keys, etc. are not affected by withDefaultValue.
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
def withFilter(p: ((K, V)) => Boolean): MapOps.WithFilter[K, V, [x]Iterable[x], [x, y]HashMap[x, y]]
Creates a non-strict filter of this immutable champ hash map.
Creates a non-strict filter of this immutable champ hash map.
Note: the difference between c filter p and c withFilter p is that the former creates a new collection, whereas the latter only restricts the domain of subsequent map, flatMap, foreach, and withFilter operations.
Note: might return different results for different runs, unless the underlying collection type is ordered.
p
the predicate used to test elements.
returns
an object of class WithFilter, which supports map, flatMap, foreach, and withFilter operations. All these operations apply to those elements of this immutable champ hash map which satisfy the predicate p.
Definition Classes
MapFactoryDefaults → IterableOps
def writeReplace(): AnyRef
Attributes
protected[this]
Definition Classes
DefaultSerializable
def zip[B](that: IterableOnce[B]): Iterable[((K, V), B)]
Returns a immutable champ hash map formed from this immutable champ hash map and another iterable collection by combining corresponding elements in pairs.
Returns a immutable champ hash map formed from this immutable champ 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.
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 immutable champ hash map containing pairs consisting of corresponding elements of this immutable champ hash map and that. The length of the returned collection is the minimum of the lengths of this immutable champ hash map and that.
Definition Classes
StrictOptimizedIterableOps → IterableOps
def zipAll[A1 >: (K, V), B](that: collection.Iterable[B], thisElem: A1, thatElem: B): Iterable[(A1, B)]
Returns a immutable champ hash map formed from this immutable champ hash map and another iterable collection by combining corresponding elements in pairs.
Returns a immutable champ hash map formed from this immutable champ 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.
that
the iterable providing the second half of each result pair
thisElem
the element to be used to fill up the result if this immutable champ hash map is shorter than that.
thatElem
the element to be used to fill up the result if that is shorter than this immutable champ hash map.
returns
a new collection of type That containing pairs consisting of corresponding elements of this immutable champ hash map and that. The length of the returned collection is the maximum of the lengths of this immutable champ hash map and that. If this immutable champ hash map is shorter than that, thisElem values are used to pad the result. If that is shorter than this immutable champ hash map, thatElem values are used to pad the result.
Definition Classes
IterableOps
def zipWithIndex: Iterable[((K, V), Int)]
Zips this immutable champ hash map with its indices.
Zips this immutable champ hash map with its indices.
returns
A new immutable champ hash map containing pairs consisting of all elements of this immutable champ hash map paired with their index. Indices start at 0.
Definition Classes
StrictOptimizedIterableOps → IterableOps → IterableOnceOps
Example:
1. List("a", "b", "c").zipWithIndex == List(("a", 0), ("b", 1), ("c", 2))

Shadowed Implicit Value Members

def +(other: String): String
Implicit
This member is added by an implicit conversion from HashMap[K, V] toany2stringadd[HashMap[K, V]] 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[K, V]]).+(other)
Definition Classes
any2stringadd

Deprecated Value Members

def +[V1 >: V](elem1: (K, V1), elem2: (K, V1), elems: (K, V1)*): HashMap[K, V1]
Definition Classes
StrictOptimizedMapOps → MapOps
Annotations
@deprecated
Deprecated
(Since version 2.13.0) Use ++ with an explicit collection argument instead of + with varargs
def ++:[V1 >: V](that: IterableOnce[(K, V1)]): HashMap[K, V1]
Definition Classes
MapOps
Annotations
@deprecated
Deprecated
(Since version 2.13.0) Use ++ instead of ++: for collections of type Iterable
def ++:[B >: (K, V)](that: IterableOnce[B]): Iterable[B]
Definition Classes
IterableOps
Annotations
@deprecated
Deprecated
(Since version 2.13.0) Use ++ instead of ++: for collections of type Iterable
def -(key1: K, key2: K, keys: K*): HashMap[K, V]
Definition Classes
MapOps
Annotations
@deprecated
Deprecated
(Since version 2.13.0) Use -- with an explicit collection
def /:[B](z: B)(op: (B, (K, V)) => B): B
Implicit
This member is added by an implicit conversion from HashMap[K, V] toIterableOnceExtensionMethods[(K, V)] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
Shadowing
This implicitly inherited member is shadowed by one or more members in this class.
To access this member you can use a type ascription:
(hashMap: IterableOnceExtensionMethods[(K, V)])./:(z)(op)
Definition Classes
IterableOnceExtensionMethods
Annotations
@deprecated @inline()
Deprecated
(Since version 2.13.0) Use .iterator.foldLeft instead
final def /:[B](z: B)(op: (B, (K, V)) => B): B
Definition Classes
IterableOnceOps
Annotations
@deprecated @inline()
Deprecated
(Since version 2.13.0) Use foldLeft instead of /:
def :\[B](z: B)(op: ((K, V), B) => B): B
Implicit
This member is added by an implicit conversion from HashMap[K, V] toIterableOnceExtensionMethods[(K, V)] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
Shadowing
This implicitly inherited member is shadowed by one or more members in this class.
To access this member you can use a type ascription:
(hashMap: IterableOnceExtensionMethods[(K, V)]).:\(z)(op)
Definition Classes
IterableOnceExtensionMethods
Annotations
@deprecated @inline()
Deprecated
(Since version 2.13.0) Use .iterator.foldRight instead
final def :\[B](z: B)(op: ((K, V), B) => B): B
Definition Classes
IterableOnceOps
Annotations
@deprecated @inline()
Deprecated
(Since version 2.13.0) Use foldRight instead of :\
def aggregate[B](z: => B)(seqop: (B, (K, V)) => 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.
Since this method degenerates to foldLeft for sequential (non-parallel) collections, where the combining operation is ignored, it is advisable to prefer foldLeft for that case.
For parallel collections, use the aggregate method specified by scala.collection.parallel.ParIterableLike.
B
the result type, produced by seqop, combop, and by this function as a final result.
z
the start value, a neutral element for seqop.
seqop
the binary operator used to accumulate the result.
combop
an associative operator for combining sequential results, unused for sequential collections.
Definition Classes
IterableOnceOps
Annotations
@deprecated
Deprecated
(Since version 2.13.0) For sequential collections, prefer foldLeft(z)(seqop). For parallel collections, use ParIterableLike#aggregate.
def collectFirst[B](f: PartialFunction[(K, V), B]): Option[B]
Implicit
This member is added by an implicit conversion from HashMap[K, V] toIterableOnceExtensionMethods[(K, V)] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
Shadowing
This implicitly inherited member is shadowed by one or more members in this class.
To access this member you can use a type ascription:
(hashMap: IterableOnceExtensionMethods[(K, V)]).collectFirst(f)
Definition Classes
IterableOnceExtensionMethods
Annotations
@deprecated
Deprecated
(Since version 2.13.0) Use .iterator.collectFirst(...) instead
def companion: IterableFactory[[_]Iterable[_]]
Definition Classes
IterableOps
Annotations
@deprecated @deprecatedOverriding() @inline()
Deprecated
(Since version 2.13.0) Use iterableFactory instead
def copyToBuffer(dest: Buffer[(K, V)]): Unit
Implicit
This member is added by an implicit conversion from HashMap[K, V] toIterableOnceExtensionMethods[(K, V)] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
Shadowing
This implicitly inherited member is shadowed by one or more members in this class.
To access this member you can use a type ascription:
(hashMap: IterableOnceExtensionMethods[(K, V)]).copyToBuffer(dest)
Definition Classes
IterableOnceExtensionMethods
Annotations
@deprecated
Deprecated
(Since version 2.13.0) Use .iterator.copyToBuffer(...) instead
final def copyToBuffer[B >: (K, V)](dest: Buffer[B]): Unit
Definition Classes
IterableOnceOps
Annotations
@deprecated @inline()
Deprecated
(Since version 2.13.0) Use dest ++= coll instead
def count(f: ((K, V)) => Boolean): Int
Implicit
This member is added by an implicit conversion from HashMap[K, V] toIterableOnceExtensionMethods[(K, V)] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
Shadowing
This implicitly inherited member is shadowed by one or more members in this class.
To access this member you can use a type ascription:
(hashMap: IterableOnceExtensionMethods[(K, V)]).count(f)
Definition Classes
IterableOnceExtensionMethods
Annotations
@deprecated
Deprecated
(Since version 2.13.0) Use .iterator.count(...) instead
def exists(f: ((K, V)) => Boolean): Boolean
Implicit
This member is added by an implicit conversion from HashMap[K, V] toIterableOnceExtensionMethods[(K, V)] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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Definition Classes
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@deprecated
Deprecated
(Since version 2.13.0) Use .iterator.exists(...) instead
def filter(f: ((K, V)) => Boolean): Iterator[(K, V)]
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Deprecated
(Since version 2.13.0) Use .iterator.filter(...) instead
def filterKeys(p: (K) => Boolean): MapView[K, V]
Filters this map by retaining only keys satisfying a predicate.
Filters this map by retaining only keys satisfying a predicate.
p
the predicate used to test keys
returns
an immutable map consisting only of those key value pairs of this map where the key satisfies the predicate p. The resulting map wraps the original map without copying any elements.
Definition Classes
MapOps
Annotations
@deprecated
Deprecated
(Since version 2.13.0) Use .view.filterKeys(f). A future version will include a strict version of this method (for now, .view.filterKeys(p).toMap).
def find(p: ((K, V)) => Boolean): Option[(K, V)]
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This member is added by an implicit conversion from HashMap[K, V] toIterableOnceExtensionMethods[(K, V)] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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Deprecated
(Since version 2.13.0) Use .iterator.find instead
def flatMap[B](f: ((K, V)) => IterableOnce[B]): IterableOnce[B]
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@deprecated
Deprecated
(Since version 2.13.0) Use .iterator.flatMap instead or consider requiring an Iterable
def fold[A1 >: A](z: A1)(op: (A1, A1) => A1): A1
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This member is added by an implicit conversion from HashMap[K, V] toIterableOnceExtensionMethods[(K, V)] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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Deprecated
(Since version 2.13.0) Use .iterator.fold instead
def foldLeft[B](z: B)(op: (B, (K, V)) => B): B
Implicit
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Deprecated
(Since version 2.13.0) Use .iterator.foldLeft instead
def foldRight[B](z: B)(op: ((K, V), B) => B): B
Implicit
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Deprecated
(Since version 2.13.0) Use .iterator.foldRight instead
def forall(f: ((K, V)) => Boolean): Boolean
Implicit
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Deprecated
(Since version 2.13.0) Use .iterator.forall(...) instead
def foreach[U](f: ((K, V)) => U): Unit
Implicit
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Deprecated
(Since version 2.13.0) Use .iterator.foreach(...) instead
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[K, V] toStringFormat[HashMap[K, V]] performed by method StringFormat in scala.Predef.
Definition Classes
StringFormat
Annotations
@deprecated @inline()
Deprecated
(Since version 2.12.16) Use formatString.format(value) instead of value.formatted(formatString), or use the f"" string interpolator. In Java 15 and later, formatted resolves to the new method in String which has reversed parameters.
def hasDefiniteSize: Boolean
Tests whether this immutable champ hash map is known to have a finite size.
Tests whether this immutable champ hash map is known to have a finite size. All strict collections are known to have finite size. For a non-strict collection such as Stream, the predicate returns true if all elements have been computed. It returns false if the stream is not yet evaluated to the end. Non-empty Iterators usually return false even if they were created from a collection with a known finite size.
Note: many collection methods will not work on collections of infinite sizes. The typical failure mode is an infinite loop. These methods always attempt a traversal without checking first that hasDefiniteSize returns true. However, checking hasDefiniteSize can provide an assurance that size is well-defined and non-termination is not a concern.
returns
true if this collection is known to have finite size, false otherwise.
Definition Classes
IterableOnceOps
Annotations
@deprecated
Deprecated
(Since version 2.13.0) Check .knownSize instead of .hasDefiniteSize for more actionable information (see scaladoc for details)
See also
method knownSize for a more useful alternative
def isEmpty: Boolean
Implicit
This member is added by an implicit conversion from HashMap[K, V] toIterableOnceExtensionMethods[(K, V)] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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@deprecated
Deprecated
(Since version 2.13.0) Use .iterator.isEmpty instead
def map[B](f: ((K, V)) => B): IterableOnce[B]
Implicit
This member is added by an implicit conversion from HashMap[K, V] toIterableOnceExtensionMethods[(K, V)] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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@deprecated
Deprecated
(Since version 2.13.0) Use .iterator.map instead or consider requiring an Iterable
def mapValues[W](f: (V) => W): MapView[K, W]
Transforms this map by applying a function to every retrieved value.
Transforms this map by applying a function to every retrieved value.
f
the function used to transform values of this map.
returns
a map view which maps every key of this map to f(this(key)). The resulting map wraps the original map without copying any elements.
Definition Classes
MapOps
Annotations
@deprecated
Deprecated
(Since version 2.13.0) Use .view.mapValues(f). A future version will include a strict version of this method (for now, .view.mapValues(f).toMap).
def max(implicit ord: math.Ordering[(K, V)]): (K, V)
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Deprecated
(Since version 2.13.0) Use .iterator.max instead
def maxBy[B](f: ((K, V)) => B)(implicit cmp: math.Ordering[B]): (K, V)
Implicit
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(Since version 2.13.0) Use .iterator.maxBy(...) instead
def min(implicit ord: math.Ordering[(K, V)]): (K, V)
Implicit
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Deprecated
(Since version 2.13.0) Use .iterator.min instead
def minBy[B](f: ((K, V)) => B)(implicit cmp: math.Ordering[B]): (K, V)
Implicit
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(Since version 2.13.0) Use .iterator.minBy(...) instead
def mkString: String
Implicit
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(Since version 2.13.0) Use .iterator.mkString instead
def mkString(sep: String): String
Implicit
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(Since version 2.13.0) Use .iterator.mkString instead
def mkString(start: String, sep: String, end: String): String
Implicit
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(Since version 2.13.0) Use .iterator.mkString instead
def nonEmpty: Boolean
Implicit
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(Since version 2.13.0) Use .iterator.nonEmpty instead
def product(implicit num: math.Numeric[(K, V)]): (K, V)
Implicit
This member is added by an implicit conversion from HashMap[K, V] toIterableOnceExtensionMethods[(K, V)] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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(Since version 2.13.0) Use .iterator.product instead
def reduce(f: ((K, V), (K, V)) => (K, V)): (K, V)
Implicit
This member is added by an implicit conversion from HashMap[K, V] toIterableOnceExtensionMethods[(K, V)] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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(Since version 2.13.0) Use .iterator.reduce(...) instead
def reduceLeft(f: ((K, V), (K, V)) => (K, V)): (K, V)
Implicit
This member is added by an implicit conversion from HashMap[K, V] toIterableOnceExtensionMethods[(K, V)] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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(Since version 2.13.0) Use .iterator.reduceLeft(...) instead
def reduceLeftOption(f: ((K, V), (K, V)) => (K, V)): Option[(K, V)]
Implicit
This member is added by an implicit conversion from HashMap[K, V] toIterableOnceExtensionMethods[(K, V)] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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Deprecated
(Since version 2.13.0) Use .iterator.reduceLeftOption(...) instead
def reduceOption(f: ((K, V), (K, V)) => (K, V)): Option[(K, V)]
Implicit
This member is added by an implicit conversion from HashMap[K, V] toIterableOnceExtensionMethods[(K, V)] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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(Since version 2.13.0) Use .iterator.reduceOption(...) instead
def reduceRight(f: ((K, V), (K, V)) => (K, V)): (K, V)
Implicit
This member is added by an implicit conversion from HashMap[K, V] toIterableOnceExtensionMethods[(K, V)] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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(Since version 2.13.0) Use .iterator.reduceRight(...) instead
def reduceRightOption(f: ((K, V), (K, V)) => (K, V)): Option[(K, V)]
Implicit
This member is added by an implicit conversion from HashMap[K, V] toIterableOnceExtensionMethods[(K, V)] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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Deprecated
(Since version 2.13.0) Use .iterator.reduceRightOption(...) instead
final def repr: HashMap[K, V]
Definition Classes
IterableOps
Annotations
@deprecated
Deprecated
(Since version 2.13.0) Use coll instead of repr in a collection implementation, use the collection value itself from the outside
def sameElements[B >: A](that: IterableOnce[B]): Boolean
Implicit
This member is added by an implicit conversion from HashMap[K, V] toIterableOnceExtensionMethods[(K, V)] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
Definition Classes
IterableOnceExtensionMethods
Annotations
@deprecated
Deprecated
(Since version 2.13.0) Use .iterator.sameElements instead
def seq: HashMap.this.type
Definition Classes
Iterable
Annotations
@deprecated
Deprecated
(Since version 2.13.0) Iterable.seq always returns the iterable itself
def size: Int
Implicit
This member is added by an implicit conversion from HashMap[K, V] toIterableOnceExtensionMethods[(K, V)] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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Deprecated
(Since version 2.13.0) Use .iterator.size instead
def sum(implicit num: math.Numeric[(K, V)]): (K, V)
Implicit
This member is added by an implicit conversion from HashMap[K, V] toIterableOnceExtensionMethods[(K, V)] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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Deprecated
(Since version 2.13.0) Use .iterator.sum instead
def to[C1](factory: Factory[(K, V), C1]): C1
Implicit
This member is added by an implicit conversion from HashMap[K, V] toIterableOnceExtensionMethods[(K, V)] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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Deprecated
(Since version 2.13.0) Use .iterator.to(factory) instead
def toArray[B >: A](implicit arg0: ClassTag[B]): Array[B]
Implicit
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@deprecated
Deprecated
(Since version 2.13.0) Use .iterator.toArray
def toBuffer[B >: A]: Buffer[B]
Implicit
This member is added by an implicit conversion from HashMap[K, V] toIterableOnceExtensionMethods[(K, V)] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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@deprecated
Deprecated
(Since version 2.13.0) Use .iterator.to(ArrayBuffer) instead
def toIndexedSeq: collection.IndexedSeq[(K, V)]
Implicit
This member is added by an implicit conversion from HashMap[K, V] toIterableOnceExtensionMethods[(K, V)] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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@deprecated
Deprecated
(Since version 2.13.0) Use .iterator.toIndexedSeq instead
final def toIterable: collection.Iterable[(K, V)]
Implicit
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@deprecated @inline()
Deprecated
(Since version 2.13.0) Use .iterator.to(Iterable) instead
final def toIterable: HashMap.this.type
returns
This collection as an Iterable[A]. No new collection will be built if this is already an Iterable[A].
Definition Classes
Iterable → IterableOps
Annotations
@deprecated
Deprecated
(Since version 2.13.7) toIterable is internal and will be made protected; its name is similar to toList or toSeq, but it doesn't copy non-immutable collections
def toIterator: Iterator[(K, V)]
Implicit
This member is added by an implicit conversion from HashMap[K, V] toIterableOnceExtensionMethods[(K, V)] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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Annotations
@deprecated @inline()
Deprecated
(Since version 2.13.0) Use .iterator instead
final def toIterator: Iterator[(K, V)]
Definition Classes
IterableOnceOps
Annotations
@deprecated @inline()
Deprecated
(Since version 2.13.0) Use .iterator instead of .toIterator
def toList: List[(K, V)]
Implicit
This member is added by an implicit conversion from HashMap[K, V] toIterableOnceExtensionMethods[(K, V)] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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@deprecated
Deprecated
(Since version 2.13.0) Use .iterator.to(List) instead
def toMap[K, V](implicit ev: <:<[(K, V), (K, V)]): Map[K, V]
Implicit
This member is added by an implicit conversion from HashMap[K, V] toIterableOnceExtensionMethods[(K, V)] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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Deprecated
(Since version 2.13.0) Use .iterator.to(Map) instead
def toSeq: Seq[(K, V)]
Implicit
This member is added by an implicit conversion from HashMap[K, V] toIterableOnceExtensionMethods[(K, V)] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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Deprecated
(Since version 2.13.0) Use .iterator.to(Seq) instead
def toSet[B >: A]: Set[B]
Implicit
This member is added by an implicit conversion from HashMap[K, V] toIterableOnceExtensionMethods[(K, V)] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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Deprecated
(Since version 2.13.0) Use .iterator.to(Set) instead
def toStream: Stream[(K, V)]
Implicit
This member is added by an implicit conversion from HashMap[K, V] toIterableOnceExtensionMethods[(K, V)] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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Annotations
@deprecated @inline()
Deprecated
(Since version 2.13.0) Use .iterator.to(LazyList) instead
final def toStream: Stream[(K, V)]
Definition Classes
IterableOnceOps
Annotations
@deprecated @inline()
Deprecated
(Since version 2.13.0) Use .to(LazyList) instead of .toStream
final def toTraversable: collection.Traversable[(K, V)]
Implicit
This member is added by an implicit conversion from HashMap[K, V] toIterableOnceExtensionMethods[(K, V)] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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@deprecated @inline()
Deprecated
(Since version 2.13.0) Use .iterator.to(Iterable) instead
final def toTraversable: collection.Traversable[(K, V)]
Converts this immutable champ hash map to an unspecified Iterable.
Converts this immutable champ hash map to an unspecified Iterable. Will return the same collection if this instance is already Iterable.
returns
An Iterable containing all elements of this immutable champ hash map.
Definition Classes
IterableOps
Annotations
@deprecated
Deprecated
(Since version 2.13.0) toTraversable is internal and will be made protected; its name is similar to toList or toSeq, but it doesn't copy non-immutable collections
def toVector: Vector[(K, V)]
Implicit
This member is added by an implicit conversion from HashMap[K, V] toIterableOnceExtensionMethods[(K, V)] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
Shadowing
This implicitly inherited member is shadowed by one or more members in this class.
To access this member you can use a type ascription:
(hashMap: IterableOnceExtensionMethods[(K, V)]).toVector
Definition Classes
IterableOnceExtensionMethods
Annotations
@deprecated @inline()
Deprecated
(Since version 2.13.0) Use .iterator.to(Vector) instead
def view(from: Int, until: Int): View[(K, V)]
A view over a slice of the elements of this collection.
A view over a slice of the elements of this collection.
Definition Classes
IterableOps
Annotations
@deprecated
Deprecated
(Since version 2.13.0) Use .view.slice(from, until) instead of .view(from, until)
def withFilter(f: ((K, V)) => Boolean): Iterator[(K, V)]
Implicit
This member is added by an implicit conversion from HashMap[K, V] toIterableOnceExtensionMethods[(K, V)] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
Shadowing
This implicitly inherited member is shadowed by one or more members in this class.
To access this member you can use a type ascription:
(hashMap: IterableOnceExtensionMethods[(K, V)]).withFilter(f)
Definition Classes
IterableOnceExtensionMethods
Annotations
@deprecated
Deprecated
(Since version 2.13.0) Use .iterator.withFilter(...) instead
def →[B](y: B): (HashMap[K, V], B)
Implicit
This member is added by an implicit conversion from HashMap[K, V] toArrowAssoc[HashMap[K, V]] performed by method ArrowAssoc in scala.Predef.This conversion will take place only if V is a subclass of Option[Nothing] (V <: Option[Nothing]).
Definition Classes
ArrowAssoc
Annotations
@deprecated
Deprecated
(Since version 2.13.0) Use -> instead. If you still wish to display it as one character, consider using a font with programming ligatures such as Fira Code.

Inherited from DefaultSerializable

Inherited from java.io.Serializable

Packages

Package structure

Automatic imports

HashMap

Companion object HashMap

final class HashMap[K, +V] extends AbstractMap[K, V] with StrictOptimizedMapOps[K, V, HashMap, HashMap[K, V]] with MapFactoryDefaults[K, V, HashMap, Iterable] with DefaultSerializable

Instance Constructors

Type Members

Value Members

Shadowed Implicit Value Members

Deprecated Value Members

Inherited from DefaultSerializable

Inherited from java.io.Serializable

Inherited from StrictOptimizedMapOps[K, V, HashMap, HashMap[K, V]]

Inherited from collection.StrictOptimizedMapOps[K, V, HashMap, HashMap[K, V]]

Inherited from StrictOptimizedIterableOps[(K, V), [_]Iterable[_], HashMap[K, V]]

Inherited from AbstractMap[K, V]

Inherited from Map[K, V]

Inherited from MapOps[K, V, [X, +Y]HashMap[X, Y], HashMap[K, V]]

Inherited from Iterable[(K, V)]

Inherited from collection.AbstractMap[K, V]

Inherited from collection.Map[K, V]

Inherited from Equals

Inherited from MapFactoryDefaults[K, V, [x, y]HashMap[x, y], [x]Iterable[x]]

Inherited from collection.MapOps[K, V, [_, _]HashMap[_, _], HashMap[K, V]]

Inherited from PartialFunction[K, V]

Inherited from (K) => V

Inherited from AbstractIterable[(K, V)]

Inherited from collection.Iterable[(K, V)]

Inherited from IterableFactoryDefaults[(K, V), [x]Iterable[x]]

Inherited from IterableOps[(K, V), [_]Iterable[_], HashMap[K, V]]

Inherited from IterableOnceOps[(K, V), [_]Iterable[_], HashMap[K, V]]

Inherited from IterableOnce[(K, V)]

Inherited from AnyRef

Inherited from Any

Inherited by implicit conversion UnliftOps fromHashMap[K, V] to UnliftOps[K, B]

Inherited by implicit conversion iterableOnceExtensionMethods fromHashMap[K, V] to IterableOnceExtensionMethods[(K, V)]

Inherited by implicit conversion any2stringadd fromHashMap[K, V] to any2stringadd[HashMap[K, V]]

Inherited by implicit conversion StringFormat fromHashMap[K, V] to StringFormat[HashMap[K, V]]

Inherited by implicit conversion Ensuring fromHashMap[K, V] to Ensuring[HashMap[K, V]]

Inherited by implicit conversion ArrowAssoc fromHashMap[K, V] to ArrowAssoc[HashMap[K, V]]

Ungrouped

HashMap