Mastering Rust - Second Edition

Tuples

Tuples differ from arrays in the way that elements of an array have to be of the same type, while items in a tuple can be a mix of types. They are heterogeneous collections and are useful for storing distinct types together. They can also be used when returning multiple values from a function. Consider the following code that uses tuples:

// tuples.rsfn main() {     let num_and_str: (u8, &str) = (40, "Have a good day!");    println!("{:?}", num_and_str);    let (num, string) = num_and_str;    println!("From tuple: Number: {}, String: {}", num, string);}

In the preceding code, num_and_str is a tuple of two items, (u8, &str). We can also extract values from an already declared tuple into individual variables. After printing the tuple, we destructure ...