class
Queue<E>

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.

Implements
Implemented by

Properties

bool isEmpty
read-only , inherited
Returns true if there are no elements in this collection.
Iterator<E> iterator
read-only , inherited
Returns a new Iterator that allows iterating the elements of this Iterable.
bool isNotEmpty
read-only , inherited
Returns true if there is at least one element in this collection.
E first
read-only , inherited
Returns the first element.
E last
read-only , inherited
Returns the last element.
E single
read-only , inherited
Checks that this iterable has only one element, and returns that element.
int length
read-only , inherited
Returns the number of elements in [this].

Constructors

Queue()
Creates a queue.
Queue.from(Iterable elements)
Creates a queue containing all elements.

Methods

removeFirst() → E
Removes and returns the first element of this queue.
removeLast() → E
Removes and returns the last element of the queue.
addFirst(E value) → void
Adds value at the beginning of the queue.
addLast(E value) → void
Adds value at the end of the queue.
add(E value) → void
Adds value at the end of the queue.
remove(Object value) → bool
Remove a single instance of value from 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.
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.
clear() → void
Removes all elements in the queue. The size of the queue becomes zero.
take(int n) → Iterable<E>
inherited
Returns a lazy iterable of the count first elements of this iterable.
map(dynamic f(E element)) → Iterable
inherited
Returns a new lazy Iterable with elements that are created by calling f on each element of this Iterable in iteration order.
takeWhile(bool test(E value)) → Iterable<E>
inherited
Returns a lazy iterable of the leading elements satisfying test.
fold(initialValue, dynamic combine(previousValue, E element)) → dynamic
inherited
Reduces a collection to a single value by iteratively combining each element of the collection with an existing value
toSet() → Set<E>
inherited
Creates a Set containing the same elements as this iterable.
firstWhere(bool test(E element), {E orElse()}) → E
inherited
Returns the first element that satisfies the given predicate test.
forEach(void f(E element)) → void
inherited
Applies the function f to each element of this collection in iteration order.
skipWhile(bool test(E value)) → Iterable<E>
inherited
Returns an Iterable that skips leading elements while test is satisfied.
join([String separator = ""]) → String
inherited
Converts each element to a String and concatenates the strings.
contains(Object element) → bool
inherited
Returns true if the collection contains an element equal to element.
lastWhere(bool test(E element), {E orElse()}) → E
inherited
Returns the last element that satisfies the given predicate test.
singleWhere(bool test(E element)) → E
inherited
Returns the single element that satisfies test.
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.
every(bool f(E element)) → bool
inherited
Checks whether every element of this iterable satisfies test.
any(bool f(E element)) → bool
inherited
Checks whether any element of this iterable satisfies test.
toList({bool growable: true}) → List<E>
inherited
Creates a List containing the elements of this Iterable.
where(bool f(E element)) → Iterable<E>
inherited
Returns a new lazy Iterable with all elements that satisfy the predicate test.
skip(int n) → Iterable<E>
inherited
Returns an Iterable that provides all but the first count elements.
expand(Iterable f(E element)) → Iterable
inherited
Expands each element of this Iterableinto zero or more elements.
elementAt(int index) → E
inherited
Returns the indexth element.