Rust also has another development option that allows you to make the hashing of the maps faster. This comes from the idea that when storing information in a HashMap, for example, the key gets hashed or a faster lookup. This is great, since it allows using arbitrary long and complex keys, but adds overhead when retrieving a value or inserting a new value, since the hash must be calculated.
Rust allows you to change the hashing method for a HashMap, and even create your own. Of course, usually, the best thing is to use the default hashing algorithm, since it has been thoroughly tested and avoids collisions (different keys having the same hash and overwriting one another). The default hasher for Rust is a very efficient hasher, but ...
