UnmodifiableSetView<E> class Null safety

An unmodifiable set.

An UnmodifiableSetView contains a Set, and prevents that set from being changed through the view. Methods that could change the set, such as add and remove, throw an UnsupportedError. Permitted operations defer to the wrapped set.

Inheritance
Mixed in types
Available Extensions

Constructors

UnmodifiableSetView(Set<E> setBase)
UnmodifiableSetView.empty()
An unmodifiable empty set.
const
factory

Properties

first → E
Returns the first element.
read-onlyinherited
hashCode → int
The hash code for this object.
read-onlyinherited
isEmpty → bool
Whether this collection has no elements.
read-onlyinherited
isNotEmpty → bool
Whether this collection has at least one element.
read-onlyinherited
iterator → Iterator<E>
Returns a new Iterator that allows iterating the elements of this Iterable.
read-onlyinherited
last → E
Returns the last element.
read-onlyinherited
length → int
Returns the number of elements in this.
read-onlyinherited
runtimeType → Type
A representation of the runtime type of the object.
read-onlyinherited
single → E
Checks that this iterable has only one element, and returns that element.
read-onlyinherited

Methods

add(E value) → bool
Throws an UnsupportedError; operations that change the set are disallowed.
inherited
addAll(Iterable<E> elements) → void
Throws an UnsupportedError; operations that change the set are disallowed.
inherited
any(bool test(E)) → bool
Checks whether any element of this iterable satisfies test.
inherited
cast<T>() → Set<T>
Provides a view of this iterable as an iterable of R instances.
inherited
clear() → void
Throws an UnsupportedError; operations that change the set are disallowed.
inherited
contains(Object? element) → bool
Whether the collection contains an element equal to element.
inherited
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 test(E)) → bool
Checks whether every element of this iterable satisfies test.
inherited
expand<T>(Iterable<T> f(E)) → Iterable<T>
Expands each element of this Iterable into zero or more elements.
inherited
firstWhere(bool test(E), {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)) → 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), {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.
inherited
map<T>(T f(E)) → 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
Throws an UnsupportedError; operations that change the set are disallowed.
inherited
removeAll(Iterable elements) → void
Throws an UnsupportedError; operations that change the set are disallowed.
inherited
removeWhere(bool test(E)) → void
Throws an UnsupportedError; operations that change the set are disallowed.
inherited
retainAll(Iterable elements) → void
Throws an UnsupportedError; operations that change the set are disallowed.
inherited
retainWhere(bool test(E)) → void
Throws an UnsupportedError; operations that change the set are disallowed.
inherited
retype<T>() → Set<T>
Deprecated("Use cast instead")">@Deprecated("Use cast instead")inherited
singleWhere(bool test(E), {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)) → 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)) → 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 containing the same elements as this iterable.
inherited
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 test(E)) → 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