dart:collection
Queue<E> class
A Queue is a collection that can be manipulated at both ends. One can iterate over the elements of a queue through forEach or with an Iterator.
It is generally not allowed to modify the queue (add or remove entries) while an operation on the queue is being performed, for example during a call to forEach. Modifying the queue while it is being iterated will most likely break the iteration. This goes both for using the iterator directly, or for iterating an Iterable returned by a method like map or where.
- Implemented by
Constructors
- Queue()
factory
- Creates a queue.
- Queue.from(Iterable elements)
factory
- Creates a queue containing all
elements. [...] - Queue.of(Iterable<E> elements)
factory
- Creates a queue from
elements. [...]
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
- Returns
true if there are no elements in this collection. [...] - isNotEmpty → bool
read-only, inherited
- Returns true if there is at least one element in this collection. [...]
- iterator → Iterator<E>
read-only, inherited
- Returns a new
Iterator that allows iterating the elements of this Iterable. [...] - last → E
read-only, inherited
- Returns the last element. [...]
- length → int
read-only, inherited
- 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) → void
- Adds
value at the end of the queue. - addAll(Iterable<E> iterable) → void
- Adds all elements of
iterable at the end of the queue. The length of the queue is extended by the length of iterable. - addFirst(E value) → void
- Adds
value at the beginning of the queue. - addLast(E value) → void
- Adds
value at the end of the queue. - cast<R>() → Queue<R>
- Provides a view of this queue as a queue of
R instances, if necessary. [...] - clear() → void
- Removes all elements in the queue. The size of the queue becomes zero.
- remove(Object value) → bool
- Remove a single instance of
value from the queue. [...] - removeFirst() → E
- Removes and returns the first element of this queue. [...]
- removeLast() → E
- Removes and returns the last element of the queue. [...]
- removeWhere(bool test(E element)) → void
- Removes all elements matched by
test from the queue. [...] - retainWhere(bool test(E element)) → void
- Removes all elements not matched by
test from the queue. [...] - any(bool test(E element)) → bool
inherited
- Checks whether any element of this iterable satisfies
test. [...] - contains(Object element) → bool
inherited
- Returns true if the collection contains an element equal to
element. [...] - elementAt(int index) → E
inherited
- Returns the
indexth element. [...] - every(bool test(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 element), { 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 concatentation of this iterable and
other. [...] - forEach(void f(E element)) → void
inherited
- Applies the function
f to each element of this collection in iteration order. - join([String separator = "" ]) → String
inherited
- Converts each element to a String and concatenates the strings. [...]
- lastWhere(bool test(E element), { E orElse() }) → E
inherited
- Returns the last element that satisfies the given predicate
test. [...] - map<T>(T f(E e)) → Iterable<T>
inherited
- Returns a new lazy Iterable with elements that are created by calling
f on each element of this Iterable in iteration order. [...] - 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. [...]
- singleWhere(bool test(E element), { E orElse() }) → E
inherited
- Returns the single element that satisfies
test. [...] - skip(int count) → 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 count) → 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>
inherited
- Creates a Set containing the same elements as this iterable. [...]
- toString() → String
inherited
- Returns a string representation of this object.
- where(bool test(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 ==(dynamic other) → bool
inherited
- The equality operator. [...]
Static Methods
- castFrom<S, T>(Queue<S> source) → Queue<T>
- Adapts
source to be a Queue<T>. [...]