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

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

A hash map is a data structure that uses a hash function to map keys to values, while a dictionary is a collection of key-value pairs, often implemented using a hash map.

Are there any performance differences between the two?

Yes, hash maps generally offer faster lookups, insertions, and deletions due to their underlying hash table implementation, while dictionaries may have additional features that can affect performance.

Can you give me an example of when to use each?

Use a hash map when you need fast access to data and don't require order. Use a dictionary when you need ordered data or additional functionalities like key validation.

What programming languages use these data structures?

Hash maps are common in languages like Java and C++, while dictionaries are often found in Python and JavaScript.