What, Why & How to Use Them
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A comprehensive introduction to hash tables covering what they are, how they work, and when to use them. Explains key-value pairs, hash functions, hash codes, and collision handling. Includes JavaScript and TypeScript implementations using both plain objects and fixed-size arrays, with a full encapsulated HashTable class. Also covers related data structures (Maps, Sets, HashMaps, Python dicts) and real-world use cases including database indexing, backend/frontend caching, finding unique elements, and transposition tables for game state tracking.
