#dictionaries

Hash Tables

Introduction Hash tables (also called hash maps or dictionaries) are one of the most important data structures you will use as a developer. They provide near constant-time lookups, inserts, and deletes on average, making them a go-to choice for many real-world problems. By the end of this tutorial, you’ll understand how hash tables work, what a hash function is, how collisions are handled, and when to prefer a hash table over other structures like arrays or linked lists. Read more →

November 18, 2025