dart:collection
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.
- Implements
-
- Implemented by
Constructors
- SetMixin()
Properties
- first → E
read-only
- Returns the first element. [...]
- isEmpty → bool
read-only
- Returns
true if there are no elements in this collection. [...] - isNotEmpty → bool
read-only
- Returns true if there is at least one element in this collection. [...]
- iterator → Iterator<E>
read-only
- Provides an iterator that iterates over the elements of this set. [...]
- last → E
read-only
- Returns the last element. [...]
- length → int
read-only
- Returns the number of elements in the iterable. [...]
- single → E
read-only
- Checks that this iterable has only one element, and returns that element. [...]
- hashCode → int
read-only, inherited
- The hash code for this object. [...]
- runtimeType → Type
read-only, inherited
- A representation of the runtime type of the object.
Methods
- add(E value) → bool
- Adds
value to the set. [...] - addAll(Iterable<E> elements) → void
- Adds all
elements to this Set. [...] - any(bool test(E element)) → bool
- Checks whether any element of this iterable satisfies
test. [...] - cast<R>() → Set<R>
- Provides a view of this set as a set of
R instances. [...] - clear() → void
- Removes all elements in the set.
- contains(Object element) → bool
- Returns true if
value is in the set. - containsAll(Iterable<Object> other) → bool
- Returns whether this Set contains all the elements of
other. - difference(Set<Object> other) → Set<E>
- Returns a new set with the elements of this that are not in
other. [...] - elementAt(int index) → E
- Returns the
indexth element. [...] - every(bool f(E element)) → bool
- Checks whether every element of this iterable satisfies
test. [...] - expand<T>(Iterable<T> f(E element)) → Iterable<T>
- Expands each element of this Iterable into zero or more elements. [...]
- firstWhere(bool test(E value), { E orElse() }) → E
- Returns the first element that satisfies the given predicate
test. [...] - 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 [...]
- followedBy(Iterable<E> other) → Iterable<E>
- Returns the lazy concatentation of this iterable and
other. [...] - forEach(void f(E element)) → void
- Applies the function
f to each element of this collection in iteration order. - intersection(Set<Object> other) → Set<E>
- Returns a new set which is the intersection between this set and
other. [...] - join([String separator = "" ]) → String
- Converts each element to a String and concatenates the strings. [...]
- lastWhere(bool test(E value), { E orElse() }) → E
- Returns the last element that satisfies the given predicate
test. [...] - lookup(Object element) → E
- If an object equal to
object is in the set, return it. [...] - map<T>(T f(E element)) → Iterable<T>
- 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
- Reduces a collection to a single value by iteratively combining elements of the collection using the provided function. [...]
- remove(Object value) → bool
- 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
- Removes each element of
elements from this set. - removeWhere(bool test(E element)) → void
- Removes all elements of this set that satisfy
test. - retainAll(Iterable<Object> elements) → void
- Removes all elements of this set that are not elements in
elements. [...] - retainWhere(bool test(E element)) → void
- Removes all elements of this set that fail to satisfy
test. - singleWhere(bool test(E value), { E orElse() }) → E
- Returns the single element that satisfies
test. [...] - skip(int n) → Iterable<E>
- Returns an Iterable that provides all but the first
count elements. [...] - skipWhile(bool test(E value)) → Iterable<E>
- Returns an
Iterable that skips leading elements while test is satisfied. [...] - take(int n) → Iterable<E>
- Returns a lazy iterable of the
count first elements of this iterable. [...] - takeWhile(bool test(E value)) → Iterable<E>
- Returns a lazy iterable of the leading elements satisfying
test. [...] - toList({bool growable: true }) → List<E>
- Creates a List containing the elements of this Iterable. [...]
- toSet() → Set<E>
- toString() → String
- Returns a string representation of this object.
- union(Set<E> other) → Set<E>
- Returns a new set which contains all the elements of this set and
other. [...] - where(bool f(E element)) → Iterable<E>
- Returns a new lazy Iterable with all elements that satisfy the predicate
test. [...] - whereType<T>() → Iterable<T>
- 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. [...]