#Caching

Build a simplified distributed caching system. What are the key components and considerations?

Design a service to identify the n closest restaurants to a user in real time. Explain the system architecture, including geospatial indexing, caching strategies, and considerations for scaling to millions of users.

Design a caching solution using Redis based on fundamental data structure concepts. Explain the components of the system and how data would be managed within the cache.

Implement a Least Recently Used (LRU) Cache. Consider the appropriate data structures for implementation. You will also need to provide a verbal explanation of your approach and write pseudocode before converting the pseudocode into working code and executing it.

Create a memoization function that caches its output based on the input arguments. Each cached entry should have an expiration time to ensure irrelevant values are removed over time.