For what reason are data structures like Map used to implement caches?

Data structures like Map are used for implementing caches for several reasons:

• Fast key-based access: Map provides efficient search, insertion, and deletion of elements by key, which is critical for caches.
• Unique keys: Cache stores data with unique identifiers, which is naturally implemented through keys in a Map.
• Flexibility: Map allows easy updating or removing of outdated data.

Example in Java using HashMap for a simple cache:

Map<String, String> cache = new HashMap<>();

// Adding to cache
cache.put("user_123", "UserData");

// Retrieving from cache
String data = cache.get("user_123");

// Checking if key exists
if (cache.containsKey("user_123")) {
    // Use cached data
}