Base implementation of Set.
This class provides a base implementation of a Set that depends only
on the abstract members: add, contains, lookup, remove,
iterator, length and toSet.
Some of the methods assume that toSet creates a modifiable set.
If using this base class for an unmodifiable set,
where toSet should return an unmodifiable set,
it's necessary to reimplement
retainAll, union, intersection and difference.
Implementations of Set using this base should consider also implementing
clear in constant time. The default implementation works by removing every
element.
- Implemented types
-
- Set<
E>
- Set<
- Implementers
- Available Extensions
Constructors
- SetBase()
-
const
Properties
- first → E
-
The first element.
read-onlyoverride
- hashCode → int
-
The hash code for this object.
read-onlyinherited
- isEmpty → bool
-
Whether this collection has no elements.
read-onlyoverride
- isNotEmpty → bool
-
Whether this collection has at least one element.
read-onlyoverride
-
iterator
→ Iterator<
E> -
An iterator that iterates over the elements of this set.
read-onlyoverride
- last → E
-
The last element.
read-onlyoverride
- length → int
-
Returns the number of elements in the iterable.
read-only
- 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-onlyoverride
Methods
-
add(
E value) → bool -
Adds
valueto the set.override -
addAll(
Iterable< E> elements) → void -
Adds all
elementsto this set.override -
any(
bool test(E element)) → bool -
Checks whether any element of this iterable satisfies
test.override -
cast<
R> () → Set< R> -
Provides a view of this set as a set of
Rinstances.override -
clear(
) → void -
Removes all elements from the set.
override
-
contains(
Object? element) → bool -
Whether
valueis in the set.override -
containsAll(
Iterable< Object?> other) → bool -
Whether this set contains all the elements of
other.override -
difference(
Set< Object?> other) → Set<E> -
Creates a new set with the elements of this that are not in
other.override -
elementAt(
int index) → E -
Returns the
indexth element.override -
every(
bool f(E element)) → bool -
Checks whether every element of this iterable satisfies
test.override -
expand<
T> (Iterable< T> f(E element)) → Iterable<T> -
Expands each element of this Iterable into zero or more elements.
override
-
firstWhere(
bool test(E value), {E orElse()?}) → E -
The first element that satisfies the given predicate
test.override -
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
override
-
followedBy(
Iterable< E> other) → Iterable<E> -
Creates the lazy concatenation of this iterable and
other.override -
forEach(
void f(E element)) → void -
Invokes
actionon each element of this iterable in iteration order.override -
intersection(
Set< Object?> other) → Set<E> -
Creates a new set which is the intersection between this set and
other.override -
join(
[String separator = ""]) → String -
Converts each element to a String and concatenates the strings.
override
-
lastWhere(
bool test(E value), {E orElse()?}) → E -
The last element that satisfies the given predicate
test.override -
lookup(
Object? element) → E? -
If an object equal to
objectis in the set, return it.override -
map<
T> (T f(E element)) → Iterable< T> -
The current elements of this iterable modified by
toElement.override -
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.
override
-
remove(
Object? value) → bool -
Removes
valuefrom the set.override -
removeAll(
Iterable< Object?> elements) → void -
Removes each element of
elementsfrom this set.override -
removeWhere(
bool test(E element)) → void -
Removes all elements of this set that satisfy
test.override -
retainAll(
Iterable< Object?> elements) → void -
Removes all elements of this set that are not elements in
elements.override -
retainWhere(
bool test(E element)) → void -
Removes all elements of this set that fail to satisfy
test.override -
singleWhere(
bool test(E value), {E orElse()?}) → E -
The single element that satisfies
test.override -
skip(
int n) → Iterable< E> -
Creates an Iterable that provides all but the first
countelements.override -
skipWhile(
bool test(E value)) → Iterable< E> -
Creates an
Iterablethat skips leading elements whiletestis satisfied.override -
take(
int n) → Iterable< E> -
Creates a lazy iterable of the
countfirst elements of this iterable.override -
takeWhile(
bool test(E value)) → Iterable< E> -
Creates a lazy iterable of the leading elements satisfying
test.override -
toList(
{bool growable = true}) → List< E> -
Creates a List containing the elements of this Iterable.
override
-
toSet(
) → Set< E> -
Creates a Set with the same elements and behavior as this
Set.override -
toString(
) → String -
A string representation of this object.
override
-
union(
Set< E> other) → Set<E> -
Creates a new set which contains all the elements of this set and
other.override -
where(
bool f(E element)) → Iterable< E> -
Creates a new lazy Iterable with all elements that satisfy the
predicate
test.override -
whereType<
T> () → Iterable< T> -
Creates a new lazy Iterable with all elements that have type
T.override
Operators
-
operator ==(
Object other) → bool -
The equality operator.
inherited
Static Methods
-
setToString(
Set set) → String - Converts a Set to a String.