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generic priority queue implementation based on a binary heap, with an efficient `updateKey` operation.\n\nIt was made first to support the pathfinding algorithms of my [jKstra](https://github.com/bbecquet/jKstra) graph library, but it can probably serve other purposes.\n\n```bash\n$\u003e npm install updatable-priority-queue\n```\n\nAPI\n---\n\nProperty | Type | Description\n---|---|---\n**`count`** | `Integer` | Number of items stored in the queue.\n\nMethod | Returns | Description\n---|---|---\n**`insert(item, key)`**| - | Adds an item to the queue, with a key used as sorting value.\n**`pop()`** | `{item, key}` | Removes and returns the first item of the queue, with its associated key, or `null` if the queue is empty.\n**`peek()`** | `{item, key}` | Reads the first item of the queue, with its associated key, without removing it, or `null` if the queue is empty.\n**`updateKey(item, newKey)`** | - | Updates the key associated with an 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