Summary of Rust Design Patterns #1

Rust Design Patterns

Source: Rust Design Patterns

Use borrowed types for arguments

By using the target type of deref coercion as a function argument, you can accept many different types.

• &String -> &str
• &Vec<T> -> &[T]
• &Box<T> -> &T

Deref coercion:
A mechanism that automatically converts certain reference types and smart pointer types into other reference types.

Why should we use borrowed types?

Using borrowed types rather than borrowing owned types avoids extra layers of intermediate references.

fn contains_three_vowels(word: &str) -> bool {
    // ...
}

let s = String::from("Ferris");
contains_three_vowels(&s);      // OK
contains_three_vowels("Ferris"); // OK

Concatenating Strings with format!

Using format! is more concise and readable than using push or push_str on a mutable String.