UnmodifiableSetView class - dart:collection library (original) (raw)
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
Implemented types
- Set<E>
Available extensions
Annotations
- @Since("2.12")
Constructors
UnmodifiableSetView(Set<E> source)
Creates an UnmodifiableSetView of source.
Properties
first → E
The first element.
no setterinherited
firstOrNull → T?
Available on Iterable<T>, provided by the IterableExtensions extension
The first element of this iterator, or null if the iterable is empty.
no setter
The hash code for this object.
no setterinherited
Available on Iterable<T>, provided by the IterableExtensions extension
Pairs of elements of the indices and elements of this iterable.
no setter
Whether this collection has no elements.
no setterinherited
Whether this collection has at least one element.
no setterinherited
An iterator that iterates over the elements of this set.
no setteroverride
last → E
The last element.
no setterinherited
lastOrNull → T?
Available on Iterable<T>, provided by the IterableExtensions extension
The last element of this iterable, or null if the iterable is empty.
no setter
The number of elements in this Iterable.
no setteroverride
Available on Iterable<T?>, provided by the NullableIterableExtensions extension
The non-null elements of this iterable.
no setter
A representation of the runtime type of the object.
no setterinherited
single → E
Checks that this iterable has only one element, and returns that element.
no setterinherited
singleOrNull → T?
Available on Iterable<T>, provided by the IterableExtensions extension
The single element of this iterator, or null.
no setter
Available on Iterable<Future<T>>, provided by the FutureIterable extension
Waits for futures in parallel.
no setter
Methods
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
Available on Iterable<T>, provided by the EnumByName extension
Creates a map from the names of enum values to the values.
Available on Iterable<T>, provided by the EnumByName extension
Finds the enum value in this list with name name.
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
Returns the indexth element.
inherited
elementAtOrNull(int index)→ T?
Available on Iterable<T>, provided by the IterableExtensions extension
The element at position index of this iterable, or null.
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
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>
Creates 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
The last element that satisfies the given predicate test.
inherited
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 nonexistent 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
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
The single element that satisfies test.
inherited
Creates an Iterable that provides all but the first count elements.
inherited
skipWhile(bool test(E value))→ Iterable<E>
Creates an Iterable that skips leading elements while test is satisfied.
inherited
Creates a lazy iterable of the count first elements of this iterable.
inherited
takeWhile(bool test(E value))→ Iterable<E>
Creates 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
Creates a Set with the same elements and behavior as this Set.
override
A string representation of this object.
inherited
Creates a new set which contains all the elements of this set and other.
inherited
where(bool f(E element))→ Iterable<E>
Creates a new lazy Iterable with all elements that satisfy the predicate test.
inherited
Creates a new lazy Iterable with all elements that have type T.
inherited
Operators
operator ==(Object other)→ bool
The equality operator.
inherited