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
-
- Iterable<E>
- EfficientLength
- Implemented by
Constructors
- Queue()
-
Creates a queue.
factory - Queue.from(Iterable elements)
-
Creates a queue containing all
elements.factory
Properties
- first → E
-
Returns the first element.
read-only, inherited - hashCode → int
-
Get a hash code for this object.
read-only, inherited - isEmpty → bool
-
Returns
trueif there are no elements in this collection.read-only, inherited - isNotEmpty → bool
-
Returns true if there is at least one element in this collection.
read-only, inherited - iterator → Iterator<E>
-
Returns a new
Iteratorthat allows iterating the elements of thisIterable.read-only, inherited - last → E
-
Returns the last element.
read-only, inherited - length → int
-
Returns the number of elements in
this.read-only, inherited - runtimeType → Type
-
A representation of the runtime type of the object.
read-only, inherited - single → E
-
Checks that this iterable has only one element, and returns that element.
read-only, inherited
Operators
-
operator ==(
other) → bool -
The equality operator.
inherited
Methods
-
add(
E value) → void -
Adds
valueat the end of the queue. -
addAll(
Iterable<E> iterable) → void -
Adds all elements of
iterableat the end of the queue. The length of the queue is extended by the length ofiterable. -
addFirst(
E value) → void -
Adds
valueat the beginning of the queue. -
addLast(
E value) → void -
Adds
valueat the end of the queue. -
any(
bool f(E element)) → bool -
Checks whether any element of this iterable satisfies
test.inherited -
clear(
) → void -
Removes all elements in the queue. The size of the queue becomes zero.
-
contains(
Object element) → bool -
Returns true if the collection contains an element equal to
element.inherited -
elementAt(
int index) → E -
Returns the
indexth element.inherited -
every(
bool f(E element)) → bool -
Checks whether every element of this iterable satisfies
test.inherited -
expand(
Iterable f(E element)) → Iterable -
Expands each element of this Iterable into zero or more elements.
inherited -
firstWhere(
bool test(E element), { E orElse() }) → E -
Returns the first element that satisfies the given predicate
test.inherited -
fold(
initialValue, dynamic combine(previousValue, E element)) → dynamic -
Reduces a collection to a single value by iteratively combining each element of the collection with an existing value
inherited -
forEach(
void f(E element)) → void -
Applies the function
fto each element of this collection in iteration order.inherited -
join(
[String separator = "" ]) → String -
Converts each element to a String and concatenates the strings.
inherited -
lastWhere(
bool test(E element), { E orElse() }) → E -
Returns the last element that satisfies the given predicate
test.inherited -
map(
dynamic f(E e)) → Iterable -
Returns a new lazy Iterable with elements that are created by calling
fon each element of thisIterablein iteration order.inherited -
noSuchMethod(
Invocation invocation) → dynamic -
Invoked when a non-existent 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 -
remove(
Object value) → bool -
Remove a single instance of
valuefrom 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
testfrom the queue. -
retainWhere(
bool test(E element)) → void -
Removes all elements not matched by
testfrom the queue. -
singleWhere(
bool test(E element)) → E -
Returns the single element that satisfies
test.inherited -
skip(
int count) → Iterable<E> -
Returns an Iterable that provides all but the first
countelements.inherited -
skipWhile(
bool test(E value)) → Iterable<E> -
Returns an
Iterablethat skips leading elements whiletestis satisfied.inherited -
take(
int count) → Iterable<E> -
Returns a lazy iterable of the
countfirst elements of this iterable.inherited -
takeWhile(
bool test(E value)) → Iterable<E> -
Returns 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 -
toSet(
) → Set<E> -
Creates a Set containing the same elements as this iterable.
inherited -
toString(
) → String -
Returns a string representation of this object.
inherited -
where(
bool test(E element)) → Iterable<E> -
Returns a new lazy Iterable with all elements that satisfy the predicate
test.inherited