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ts-priority-queue
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A priority queue is a data structure with these operations:
Operation | Syntax (ts-priority-queue) | Description |
---|---|---|
Create | var queue = new PriorityQueue(); | Creates a priority queue |
Queue | queue.queue(value); | Inserts a new value in the queue |
Length | var length = queue.length; | Returns the number of elements in the queue |
Peek | var firstItem = queue.peek(); | Returns the smallest item in the queue and leaves the queue unchanged |
Dequeue | var firstItem = queue.dequeue(); | Returns the smallest item in the queue and removes it from the queue |
Clear | queue.clear(); | Removes all values from the queue |
You cannot access the data in any other way: you must dequeue or peek.
Provides an O(log n) approach to priority queue insertions and removals. I forked this from the CoffeeScript js-priority-queue library so that I could write it in TypeScript. I've removed the array- and BHeap-based strategies as they were not recommended for use anyway.
You can npm install ts-priority-queue
Then write code like this:
var queue = new PriorityQueue({ comparator: function(a, b) { return b - a; }});
queue.queue(5);
queue.queue(3);
queue.queue(2);
var lowest = queue.dequeue(); // returns 5
How exactly will these elements be ordered? Let's use the comparator
option.
This is the argument we would pass to
Array.prototype.sort:
var compareNumbers = function(a, b) { return a - b; };
var queue = new PriorityQueue({ comparator: compareNumbers });
You can also pass initial values, in any order. With lots of values, it's faster to load them all at once than one at a time.
var queue = new PriorityQueue({ comparator: compareNumbers, initialValues: [ 1, 2, 3 ] })
Complexity:
Operation | Complexity |
---|---|
Create | O(n lg n) |
Queue | O(lg n) |
Peek | O(1) |
Dequeue | O(lg n) |
Public Domain. Do with it what you will.
FAQs
Priority queue data structures
We found that ts-priority-queue demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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