## LRUCache.keys() method  
Returns the list of all keys in the cache.

**Signature:**  
```typescript
keys(): IterableIterator<string>;
```

**Returns:**  
IterableIterator<string>

The array of keys in the cache.

- [LRUCache.keys() method](/content/docs/sdk/core.lrucache.keys#lrucachekeys-method/index.html)