Hash Tables
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May 1, 2024
Updated May 9, 2025
32 minute read
Hash tables are a fundamental data structure in computer science, offering an efficient way to store and retrieve data. At a high level, a hash table, sometimes called a hash map, is a data structure that implements an associative array, which is an abstract data type that maps keys to values. Think of it like a specialized filing system where each piece of information (the "value") is given a unique identifier (the "key"). A special function, known as a hash function, takes this key and converts it into an index, which is essentially a "slot number" in an array where the data is stored. This allows for very fast lookups, insertions, and deletions of data.
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