CountingHashSet<E> class

A HashSet that remembers how many times an element was added, and requires that element to be removed that many times before it's actually removed.

When elements are added, they replace existing equal elements (instead of doing nothing).

Implemented types

• Set<E>

Mixed in types

• SetMixin<E>

Available Extensions

• EnumByName
• IterableExtensions
• NullableIterableExtensions

Constructors

CountingHashSet({bool equals(E, E)?, int hashCode(E)?, bool isValidKey(dynamic)?})

Equivalent to HashSet's main constructor.

CountingHashSet.identity()

Equivalent to HashSet.identity.

CountingHashSet.of(Iterable<E> elements)

Equivalent to HashSet.of.

factory

Properties

counts → Map<E, int>

Values in the set, mapped to the number of times they've been added.

no setter

first → E

The first element.

no setter, override

hashCode → int

The hash code for this object.

no setter, inherited

isEmpty → bool

Whether this collection has no elements.

no setter, override

isNotEmpty → bool

Whether this collection has at least one element.

no setter, override

iterator → Iterator<E>

An iterator that iterates over the elements of this set.

no setter, override

last → E

The last element.

no setter, override

length → int

The number of elements in this.

no setter, override

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

single → E

Checks that this iterable has only one element, and returns that element.

no setter, override

Methods

add(E value) → bool

Adds value to the set.

override

addAll(Iterable<E> elements) → void

Adds all elements to this set.

inherited

addCounts(Map<E, int> counts) → void

Adds the given values with counts.

any(bool test(E element)) → bool

Checks whether any element of this iterable satisfies test.

override

cast<R>() → Set<R>

Provides a view of this set as a set of R instances.

override

clear() → void

Removes all elements from the set.

override

contains(Object? element) → bool

Whether value is in the set.

override

containsAll(Iterable<Object?> other) → bool

Whether this set contains all the elements of other.

override

difference(Set<Object?> other) → Set<E>

Creates a new set with the elements of this that are not in other.

override

elementAt(int index) → E

Returns the indexth element.

override

every(bool f(E element)) → bool

Checks whether every element of this iterable satisfies test.

override

expand<T>(Iterable<T> f(E element)) → Iterable<T>

Expands each element of this Iterable into zero or more elements.

override

firstWhere(bool test(E value), {E orElse()?}) → E

The first element that satisfies the given predicate test.

override

fold<T>(T initialValue, T combine(T previousValue, E element)) → T

Reduces a collection to a single value by iteratively combining each element of the collection with an existing value

override

followedBy(Iterable<E> other) → Iterable<E>

Creates the lazy concatenation of this iterable and other.

override

forEach(void f(E element)) → void

Invokes action on each element of this iterable in iteration order.

override

intersection(Set<Object?> other) → Set<E>

Creates a new set which is the intersection between this set and other.

override

join([String separator = ""]) → String

Converts each element to a String and concatenates the strings.

override

lastWhere(bool test(E value), {E orElse()?}) → E

The last element that satisfies the given predicate test.

override

lookup(Object? element) → E?

If an object equal to object is in the set, return it.

override

map<T>(T f(E element)) → Iterable<T>

The current elements of this iterable modified by toElement.

override

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

reduce(E combine(E value, E element)) → E

Reduces a collection to a single value by iteratively combining elements of the collection using the provided function.

override

remove(Object? value) → bool

Removes value from the set.

override

removeAll(Iterable<Object?> elements) → void

Removes each element of elements from this set.

inherited

removeWhere(bool test(E element)) → void

Removes all elements of this set that satisfy test.

inherited

retainAll(Iterable<Object?> elements) → void

Removes all elements of this set that are not elements in elements.

inherited

retainWhere(bool test(E element)) → void

Removes all elements of this set that fail to satisfy test.

inherited

singleWhere(bool test(E value), {E orElse()?}) → E

The single element that satisfies test.

override

skip(int n) → Iterable<E>

Creates an Iterable that provides all but the first count elements.

override

skipWhile(bool test(E value)) → Iterable<E>

Creates an Iterable that skips leading elements while test is satisfied.

override

take(int n) → Iterable<E>

Creates a lazy iterable of the count first elements of this iterable.

override

takeWhile(bool test(E value)) → Iterable<E>

Creates a lazy iterable of the leading elements satisfying test.

override

toList({bool growable = true}) → List<E>

Creates a List containing the elements of this Iterable.

override

toSet() → Set<E>

Creates a Set with the same elements and behavior as this Set.

override

toString() → String

A string representation of this object.

override

union(Set<E> other) → Set<E>

Creates a new set which contains all the elements of this set and other.

override

where(bool f(E element)) → Iterable<E>

Creates a new lazy Iterable with all elements that satisfy the predicate test.

override

whereType<T>() → Iterable<T>

Creates a new lazy Iterable with all elements that have type T.

override

Operators

operator ==(Object other) → bool

The equality operator.

inherited