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SetMixin<E> class

Mixin implementation of Set.

This class provides a base implementation of a Set that depends only on the abstract members: add, contains, lookup, remove, iterator, length and toSet.

Some of the methods assume that toSet creates a modifiable set. If using this mixin for an unmodifiable set, where toSet should return an unmodifiable set, it's necessary to reimplement retainAll, union, intersection and difference.

Implementations of Set using this mixin should consider also implementing clear in constant time. The default implementation works by removing every element.

Implemented types
Implementers

Constructors

SetMixin()

Properties

first → E
read-only, override
Returns the first element. [...]
isEmptybool
read-only, override
Returns true if there are no elements in this collection. [...]
isNotEmptybool
read-only, override
Returns true if there is at least one element in this collection. [...]
iteratorIterator<E>
read-only, override
Provides an iterator that iterates over the elements of this set. [...]
last → E
read-only, override
Returns the last element. [...]
lengthint
read-only
Returns the number of elements in the iterable. [...]
single → E
read-only, override
Checks that this iterable has only one element, and returns that element. [...]
hashCodeint
read-only, inherited
The hash code for this object. [...]
runtimeTypeType
read-only, inherited
A representation of the runtime type of the object.

Methods

add(E value) → bool
override
Adds value to the set. [...]
addAll(Iterable<E> elements) → void
override
Adds all elements to this Set. [...]
any(bool test(E element)) → bool
override
Checks whether any element of this iterable satisfies test. [...]
cast<R>() → Set<R>
override
Provides a view of this set as a set of R instances. [...]
clear() → void
override
Removes all elements in the set.
contains(Object element) → bool
override
Returns true if value is in the set.
containsAll(Iterable<Object> other) → bool
override
Returns whether this Set contains all the elements of other.
difference(Set<Object> other) → Set<E>
override
Returns a new set with the elements of this that are not in other. [...]
elementAt(int index) → E
override
Returns the indexth element. [...]
every(bool f(E element)) → bool
override
Checks whether every element of this iterable satisfies test. [...]
expand<T>(Iterable<T> f(E element)) → Iterable<T>
override
Expands each element of this Iterable into zero or more elements. [...]
firstWhere(bool test(E value), { E orElse() }) → E
override
Returns the first element that satisfies the given predicate test. [...]
fold<T>(T initialValue, T combine(T previousValue, E element)) → T
override
Reduces a collection to a single value by iteratively combining each element of the collection with an existing value [...]
followedBy(Iterable<E> other) → Iterable<E>
override
Returns the lazy concatentation of this iterable and other. [...]
forEach(void f(E element)) → void
override
Applies the function f to each element of this collection in iteration order.
intersection(Set<Object> other) → Set<E>
override
Returns a new set which is the intersection between this set and other. [...]
join([String separator = "" ]) → String
override
Converts each element to a String and concatenates the strings. [...]
lastWhere(bool test(E value), { E orElse() }) → E
override
Returns the last element that satisfies the given predicate test. [...]
lookup(Object element) → E
override
If an object equal to object is in the set, return it. [...]
map<T>(T f(E element)) → Iterable<T>
override
Returns a new lazy Iterable with elements that are created by calling f on each element of this Iterable in iteration order. [...]
reduce(E combine(E value, E element)) → E
override
Reduces a collection to a single value by iteratively combining elements of the collection using the provided function. [...]
remove(Object value) → bool
override
Removes value from the set. Returns true if value was in the set. Returns false otherwise. The method has no effect if value value was not in the set.
removeAll(Iterable<Object> elements) → void
override
Removes each element of elements from this set.
removeWhere(bool test(E element)) → void
override
Removes all elements of this set that satisfy test.
retainAll(Iterable<Object> elements) → void
override
Removes all elements of this set that are not elements in elements. [...]
retainWhere(bool test(E element)) → void
override
Removes all elements of this set that fail to satisfy test.
singleWhere(bool test(E value), { E orElse() }) → E
override
Returns the single element that satisfies test. [...]
skip(int n) → Iterable<E>
override
Returns an Iterable that provides all but the first count elements. [...]
skipWhile(bool test(E value)) → Iterable<E>
override
Returns an Iterable that skips leading elements while test is satisfied. [...]
take(int n) → Iterable<E>
override
Returns a lazy iterable of the count first elements of this iterable. [...]
takeWhile(bool test(E value)) → Iterable<E>
override
Returns a lazy iterable of the leading elements satisfying test. [...]
toList({bool growable: true }) → List<E>
override
Creates a List containing the elements of this Iterable. [...]
toSet() → Set<E>
override
Creates a Set containing the same elements as this iterable. [...]
toString() → String
override
Returns a string representation of this object.
union(Set<E> other) → Set<E>
override
Returns a new set which contains all the elements of this set and other. [...]
where(bool f(E element)) → Iterable<E>
override
Returns a new lazy Iterable with all elements that satisfy the predicate test. [...]
whereType<T>() → Iterable<T>
override
Returns a new lazy Iterable with all elements that have type T. [...]
noSuchMethod(Invocation invocation) → dynamic
inherited
Invoked when a non-existent method or property is accessed. [...]

Operators

operator ==(dynamic other) → bool
inherited
The equality operator. [...]

© 2012 the Dart project authors
Licensed under the Creative Commons Attribution-ShareAlike License v4.0.
https://api.dart.dev/stable/2.5.0/dart-collection/SetMixin-class.html