dart:collection
UnmodifiableSetView<E> class
An unmodifiable Set view of another Set.
Methods that could change the set, such as add and remove, must not be called.
final baseSet = <String>{'Mars', 'Mercury', 'Earth', 'Venus'};
final unmodifiableSetView = UnmodifiableSetView(baseSet);
// Remove an element from the original set.
baseSet.remove('Venus');
print(unmodifiableSetView); // {Mars, Mercury, Earth}
unmodifiableSetView.remove('Earth'); // Throws. - Inheritance
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- Available Extensions
- Annotations
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Constructors
- UnmodifiableSetView(Set<E> source)
- Creates an UnmodifiableSetView of
source.
Properties
- first → E
read-only, inherited
- Returns the first element.
- hashCode → int
read-only, inherited
- The hash code for this object.
- isEmpty → bool
read-only, inherited
- Whether this collection has no elements.
- isNotEmpty → bool
read-only, inherited
- Whether this collection has at least one element.
- iterator → Iterator<E>
read-only, override
- An iterator that iterates over the elements of this set.
- last → E
read-only, inherited
- Returns the last element.
- length → int
read-only, override
- Returns the number of elements in the iterable.
- runtimeType → Type
read-only, inherited
- A representation of the runtime type of the object.
- single → E
read-only, inherited
- Checks that this iterable has only one element, and returns that element.
Methods
- add(E value) → bool
inherited
- This operation is not supported by an unmodifiable set.
- addAll(Iterable<E> elements) → void
inherited
- This operation is not supported by an unmodifiable set.
- any(bool test(E element)) → bool
inherited
- Checks whether any element of this iterable satisfies
test. - cast<R>() → Set<R>
inherited
- Provides a view of this set as a set of
R instances. - clear() → void
inherited
- This operation is not supported by an unmodifiable set.
- contains(Object? element) → bool
override
- Whether
value is in the set. - containsAll(Iterable<Object?> other) → bool
inherited
- Whether this set contains all the elements of
other. - difference(Set<Object?> other) → Set<E>
inherited
- Creates a new set with the elements of this that are not in
other. - elementAt(int index) → E
inherited
- Returns the
indexth element. - every(bool f(E element)) → bool
inherited
- Checks whether every element of this iterable satisfies
test. - expand<T>(Iterable<T> f(E element)) → Iterable<T>
inherited
- Expands each element of this Iterable into zero or more elements.
- firstWhere(bool test(E value), {E orElse()?}) → E
inherited
- Returns the first element that satisfies the given predicate
test. - fold<T>(T initialValue, T combine(T previousValue, E element)) → T
inherited
- 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>
inherited
- Returns the lazy concatenation of this iterable and
other. - forEach(void f(E element)) → void
inherited
- Invokes
action on each element of this iterable in iteration order. - intersection(Set<Object?> other) → Set<E>
inherited
- Creates a new set which is the intersection between this set and
other. - join([String separator = ""]) → String
inherited
- Converts each element to a String and concatenates the strings.
- lastWhere(bool test(E value), {E orElse()?}) → E
inherited
- 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>
inherited
- The current elements of this iterable modified by
toElement. - noSuchMethod(Invocation invocation) → dynamic
inherited
- Invoked when a non-existent method or property is accessed.
- reduce(E combine(E value, E element)) → E
inherited
- Reduces a collection to a single value by iteratively combining elements of the collection using the provided function.
- remove(Object? value) → bool
inherited
- This operation is not supported by an unmodifiable set.
- removeAll(Iterable<Object?> elements) → void
inherited
- This operation is not supported by an unmodifiable set.
- removeWhere(bool test(E element)) → void
inherited
- This operation is not supported by an unmodifiable set.
- retainAll(Iterable<Object?> elements) → void
inherited
- This operation is not supported by an unmodifiable set.
- retainWhere(bool test(E element)) → void
inherited
- This operation is not supported by an unmodifiable set.
- singleWhere(bool test(E value), {E orElse()?}) → E
inherited
- Returns the single element that satisfies
test. - skip(int n) → Iterable<E>
inherited
- Returns an Iterable that provides all but the first
count elements. - skipWhile(bool test(E value)) → Iterable<E>
inherited
- Returns an
Iterable that skips leading elements while test is satisfied. - take(int n) → Iterable<E>
inherited
- Returns a lazy iterable of the
count first elements of this iterable. - takeWhile(bool test(E value)) → Iterable<E>
inherited
- Returns a lazy iterable of the leading elements satisfying
test. - toList({bool growable = true}) → List<E>
inherited
- Creates a List containing the elements of this Iterable.
- toSet() → Set<E>
override
- Creates a Set with the same elements and behavior as this
Set. - toString() → String
inherited
- A string representation of this object.
- union(Set<E> other) → Set<E>
inherited
- Creates a new set which contains all the elements of this set and
other. - where(bool f(E element)) → Iterable<E>
inherited
- Returns a new lazy Iterable with all elements that satisfy the predicate
test. - whereType<T>() → Iterable<T>
inherited
- Returns a new lazy Iterable with all elements that have type
T.
Operators
- operator ==(Object other) → bool
inherited
- The equality operator.