What are some common errors in LFU cache implementations?

What are some common errors in LFU cache implementations?

Some common errors include not properly updating the frequency count, failing to handle ties in frequency, and not evicting the least frequently used items correctly.

Can you explain how frequency count updates can go wrong?

Sure! If the frequency count isn't updated every time an item is accessed, it can lead to incorrect eviction decisions.

What happens if two items have the same frequency?

In such cases, the implementation should have a strategy to decide which item to evict, like using a timestamp or a secondary criterion.

How can I test my LFU cache implementation for these errors?

You can create unit tests that simulate various access patterns and check if the cache behaves as expected, especially during evictions.