Destructing struct
Destructuring let's us create variable that are not part of the structure, we can get values from a struct or enum using let backwards.
struct Person{
name: String,
age: u8,
height: u8,
happy: bool,
}
fn main(){
let adetunji = Person{
name: String::from("Adetunji Ojekunle"),
age: 29,
height: 170,
happy: true
};
let Person{name,happy,..} = adetunji;
println!("Hey, I am {name} and I am happy: {happy}");
}
The .. tells the compiler I want to ignore the other values (height and happy), if not there will be a pattern does not match error as the pattern on the right must match the one on the left.
I can also rename variables as I destructure. Say I want to rename height to cm
// previous code
let Person{height = cm,..} = adetunji;
//other code
Destructuring can also happen in a function signature.
fn introduce_person(person: &Person){
println!("Hello!, {person.name}");
}
With Destructuring, this will be
fn introduce_person({name,..}: &Person){
println!("Hello!, {name}")
}