UnmodifiableSetView<E> class Null safety

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
Available Extensions
Annotations
  • @Since("2.12")

Constructors

UnmodifiableSetView(Set<E> source)
Creates an UnmodifiableSetView of source.

Properties

first → E
Returns the first element. [...]
read-only, inherited
hashCode → int
The hash code for this object. [...]
read-only, inherited
isEmpty → bool
Whether this collection has no elements. [...]
read-only, inherited
isNotEmpty → bool
Whether this collection has at least one element. [...]
read-only, inherited
iterator → Iterator<E>
An iterator that iterates over the elements of this set. [...]
read-only, override
last → E
Returns the last element. [...]
read-only, inherited
length → int
Returns the number of elements in the iterable. [...]
read-only, override
runtimeType → Type
A representation of the runtime type of the object.
read-only, inherited
single → E
Checks that this iterable has only one element, and returns that element. [...]
read-only, inherited

Methods

add(E value) → bool
This operation is not supported by an unmodifiable set.
inherited
addAll(Iterable<E> elements) → void
This operation is not supported by an unmodifiable set.
inherited
any(bool test(E element)) → bool
Checks whether any element of this iterable satisfies test. [...]
inherited
cast<R>() → Set<R>
Provides a view of this set as a set of R instances. [...]
inherited
clear() → void
This operation is not supported by an unmodifiable set.
inherited
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. [...]
inherited
difference(Set<Object?> other) → Set<E>
Creates a new set with the elements of this that are not in other. [...]
inherited
elementAt(int index) → E
Returns the indexth element. [...]
inherited
every(bool f(E element)) → bool
Checks whether every element of this iterable satisfies test. [...]
inherited
expand<T>(Iterable<T> f(E element)) → Iterable<T>
Expands each element of this Iterable into zero or more elements. [...]
inherited
firstWhere(bool test(E value), {E orElse()?}) → E
Returns the first element that satisfies the given predicate test. [...]
inherited
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 [...]
inherited
followedBy(Iterable<E> other) → Iterable<E>
Returns the lazy concatenation of this iterable and other. [...]
inherited
forEach(void f(E element)) → void
Invokes action on each element of this iterable in iteration order. [...]
inherited
intersection(Set<Object?> other) → Set<E>
Creates a new set which is the intersection between this set and other. [...]
inherited
join([String separator = ""]) → String
Converts each element to a String and concatenates the strings. [...]
inherited
lastWhere(bool test(E value), {E orElse()?}) → E
Returns the last element that satisfies the given predicate test. [...]
inherited
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. [...]
inherited
noSuchMethod(Invocation invocation) → dynamic
Invoked when a non-existent 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. [...]
inherited
remove(Object? value) → bool
This operation is not supported by an unmodifiable set.
inherited
removeAll(Iterable<Object?> elements) → void
This operation is not supported by an unmodifiable set.
inherited
removeWhere(bool test(E element)) → void
This operation is not supported by an unmodifiable set.
inherited
retainAll(Iterable<Object?> elements) → void
This operation is not supported by an unmodifiable set.
inherited
retainWhere(bool test(E element)) → void
This operation is not supported by an unmodifiable set.
inherited
singleWhere(bool test(E value), {E orElse()?}) → E
Returns the single element that satisfies test. [...]
inherited
skip(int n) → Iterable<E>
Returns an Iterable that provides all but the first count elements. [...]
inherited
skipWhile(bool test(E value)) → Iterable<E>
Returns an Iterable that skips leading elements while test is satisfied. [...]
inherited
take(int n) → Iterable<E>
Returns a lazy iterable of the count first elements of this iterable. [...]
inherited
takeWhile(bool test(E value)) → Iterable<E>
Returns a lazy iterable of the leading elements satisfying test. [...]
inherited
toList({bool growable = true}) → List<E>
Creates a List containing the elements of this Iterable. [...]
inherited
toSet() → Set<E>
Creates a Set with the same elements and behavior as this Set. [...]
override
toString() → String
A string representation of this object. [...]
inherited
union(Set<E> other) → Set<E>
Creates a new set which contains all the elements of this set and other. [...]
inherited
where(bool f(E element)) → Iterable<E>
Returns a new lazy Iterable with all elements that satisfy the predicate test. [...]
inherited
whereType<T>() → Iterable<T>
Returns a new lazy Iterable with all elements that have type T. [...]
inherited

Operators

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