PriorityQueue<E> class Null safety

A priority queue is a priority based work-list of elements.

The queue allows adding elements, and removing them again in priority order. The same object can be added to the queue more than once. There is no specified ordering for objects with the same priority (where the comparison function returns zero).

Operations which care about object equality, contains and remove, use Object.== for testing equality. In most situations this will be the same as identity (identical), but there are types, like String, where users can reasonably expect distinct objects to represent the same value. If elements override Object.==, the comparison function must always give equal objects the same priority, otherwise contains or remove might not work correctly.



PriorityQueue([int comparison(E, E)])
Creates an empty PriorityQueue. [...]


first → E
Returns the next element that will be returned by removeFirst. [...]
hashCode int
The hash code for this object. [...]
read-only, inherited
isEmpty bool
Whether the queue is empty.
isNotEmpty bool
Whether the queue has any elements.
length int
Number of elements in the queue.
runtimeType Type
A representation of the runtime type of the object.
read-only, inherited
unorderedElements Iterable<E>
Provides efficient access to all the elements curently in the queue. [...]


add(E element) → void
Adds element to the queue. [...]
addAll(Iterable<E> elements) → void
Adds all elements to the queue.
clear() → void
Removes all the elements from this queue.
contains(E object) bool
Checks if object is in the queue. [...]
noSuchMethod(Invocation invocation) → dynamic
Invoked when a non-existent method or property is accessed. [...]
remove(E element) bool
Removes an element of the queue that compares equal to element. [...]
removeAll() Iterable<E>
Removes all the elements from this queue and returns them. [...]
removeFirst() → E
Removes and returns the element with the highest priority. [...]
toList() List<E>
Returns a list of the elements of this queue in priority order. [...]
toSet() Set<E>
Return a comparator based set using the comparator of this queue. [...]
toString() String
A string representation of this object. [...]
toUnorderedList() List<E>
Returns a list of the elements of this queue in no specific order. [...]


operator ==(Object other) bool
The equality operator. [...]