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

Object
SetBase<E>
UnmodifiableSetView

Available Extensions

EnumByName

Annotations

@Since("2.12")

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.

© 2012 the Dart project authors
Licensed under the Creative Commons Attribution-ShareAlike License v4.0.
https://api.dart.dev/stable/2.17.0/dart-collection/UnmodifiableSetView-class.html

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Last Updated	2022-05-14T07:21:19Z