Example
Rust programs use pattern matching extensively to deconstruct values, whether using match, if let, or deconstructing let patterns. Tuples can be deconstructed as you might expect using match
fn foo(x: (&str, isize, bool)) {
match x {
(_, 42, _) => println!("it's 42"),
(_, _, false) => println!("it's not true"),
_ => println!("it's something else"),
}
}
or with if let
fn foo(x: (&str, isize, bool)) {
if let (_, 42, _) = x {
println!("it's 42");
} else {
println!("it's something else");
}
}
you can also bind inside the tuple using let-deconstruction
fn foo(x: (&str, isize, bool)) {
let (_, n, _) = x;
println!("the number is {}", n);
}
