What are collections in Rust?

What are collections in Rust?

Collections in Rust are data structures that allow you to store multiple values in a single variable. They include vectors, hash maps, and more.

Can you explain the difference between a vector and a hash map?

Sure! A vector is a dynamic array that stores elements in a contiguous block of memory, while a hash map is a key-value store that allows for fast lookups based on keys.

When should I use a hash map instead of a vector?

Use a hash map when you need to associate values with unique keys and require fast access. Use a vector when you need ordered storage and don't need key-based access.

Are there any performance considerations I should be aware of?

Yes, vectors have better cache performance due to contiguous memory, while hash maps can have overhead from hashing and collision resolution. Choose based on your access patterns.