What is the difference between a hash table and a dictionary?

What is the difference between a hash table and a dictionary?

A hash table is a data structure that implements an associative array, while a dictionary is a specific implementation of a hash table in many programming languages.

Can you explain how they work?

Sure! A hash table uses a hash function to compute an index into an array of buckets or slots, from which the desired value can be found. A dictionary, on the other hand, typically provides a higher-level interface for key-value pairs.

Are there any performance differences?

Yes, hash tables generally offer average-case constant time complexity for lookups, insertions, and deletions, while dictionaries may have additional overhead depending on the language and implementation.

When should I use one over the other?

Use a hash table when you need a fast, low-level implementation, and a dictionary when you prefer ease of use and built-in functionality.