Rust HashMap and HashSet Collection Types 🦀

The Rust standard library provides a couple of useful constructs called the HashMap and HashSet. These types are exposed in the "collections" module with the "std" crate. You don't need to install anything beyond the Rust toolchain in order to have access to these data types.

HashMaps are also known as "dictionary" or "hashtable" types in other programming languages. HashMaps are sometimes referred to as "associative arrays" as well. Each entry in a HashMap must have a unique key, and any value. The data types for HashMap keys and values can be almost anything, even user-defined structs, thanks to Rust generics, as long as they implement the necessary Traits (Eq, Hash, PartialEq). Keep in mind that Traits can't be used as keys, however.

HashSets allow you to create a "set" (array) of unique values. HashSets are also a generic type, which means they can contain any data type that you wish. A given value cannot appear more than once in a HashSet, making them useful constructs for any situation where you need to avoid accidental duplicate values.

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📖 Rust HashMap docs ➡️ https://doc.rust-lang.org/stable/std/...

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