The **array‑lru** module provides a high‑performance least‑recently‑used cache that stores values keyed by numeric indices, using a fixed‑size array and a small‑collision hash bucket algorithm to achieve fast O(1) get/set operations. It’s aimed at Node.js developers who need a lightweight, ultra‑fast LRU cache for scenarios such as in‑memory data stores, message queues, or any system where numeric keys are abundant and eviction speed matters.