Rust Essentials - Second Edition

Tuples

If you want to combine a certain number of values of different types, then you can collect them in a tuple, enclosed between parentheses (( )) and separated by commas, like this:

// from Chapter 4/code/tuples.rs 
let thor = ("Thor", true, 3500u32); 
println!("{:?}", thor); // ("Thor", true, 3500) 

The type of thor is (&str, bool, u32), that is, the tuple of the item's types.

To extract an item on index use a dot syntax:

println!("{} - {} - {}", thor.0, thor.1, thor.2); 

Another way to extract items to other variables is by destructuring the tuple:

let (name, _, power) = thor; 
println!("{} has {} power points ", name, power); 

This prints out the following output:

    Thor has 3500 power points  

Here the let statement matches the pattern ...