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[Home](./index.md) &gt; [@empathyco/x-components](./x-components.md) &gt; [BaseXPriorityQueue](./x-components.basexpriorityqueue.md)

## BaseXPriorityQueue class

. Default [XPriorityQueue](./x-components.xpriorityqueue.md) implementation.

Method big-O \-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\- - push O(n) - pop O(1) - peek O(1) - at O(1)

**Signature:**

```typescript
export declare class BaseXPriorityQueue<SomeRecord extends Dictionary, SomeData extends Dictionary = Dictionary> implements XPriorityQueue<SomeRecord, SomeData> 
```
**Implements:** [XPriorityQueue](./x-components.xpriorityqueue.md)<!-- -->&lt;SomeRecord, SomeData&gt;

## Constructors

|  Constructor | Modifiers | Description |
|  --- | --- | --- |
|  [(constructor)(comparatorFn)](./x-components.basexpriorityqueue._constructor_.md) |  | Creates a new [XPriorityQueue](./x-components.xpriorityqueue.md)<!-- -->. |

## Properties

|  Property | Modifiers | Type | Description |
|  --- | --- | --- | --- |
|  [keys](./x-components.basexpriorityqueue.keys.md) | <code>readonly</code> | (keyof SomeRecord)\[\] | The <code>keys</code> property of a [XPriorityQueue](./x-components.xpriorityqueue.md) represents the keys of that queue. The value is an array of the parametrized <code>Key</code> type. |

## Methods

|  Method | Modifiers | Description |
|  --- | --- | --- |
|  [at(index)](./x-components.basexpriorityqueue.at.md) |  | Retrieves the [node](./x-components.xpriorityqueuenode.md) at a given position. |
|  [clear()](./x-components.basexpriorityqueue.clear.md) |  | Removes all the [nodes](./x-components.xpriorityqueuenode.md) from the queue. |
|  [isEmpty()](./x-components.basexpriorityqueue.isempty.md) |  | Checks if the queue is empty. |
|  [peek()](./x-components.basexpriorityqueue.peek.md) |  | Retrieves, but does not remove, the head [node](./x-components.xpriorityqueuenode.md) of the queue. |
|  [pop()](./x-components.basexpriorityqueue.pop.md) |  | See [XPriorityQueue.pop](./x-components.xpriorityqueue.pop.md)<!-- -->. |
|  [push(key, priority, data)](./x-components.basexpriorityqueue.push.md) |  | . See [XPriorityQueue.push](./x-components.xpriorityqueue.push.md)<!-- -->. |
|  [size()](./x-components.basexpriorityqueue.size.md) |  | Retrieves the number of [nodes](./x-components.xpriorityqueuenode.md) stored in the queue. |
|  [toString()](./x-components.basexpriorityqueue.tostring.md) |  | Returns a string representation of this collection. The string representation consists of a list of the queue [nodes](./x-components.xpriorityqueuenode.md) split in multiple lines, one for each one. Nodes are converted to strings as by toString(). |