vector - 如何从 Rust 结构数组中获取字段值数组？

Question

我想将结构数组映射到字段值数组。我该怎么做？

pub struct Person {
    name: String
} 

fn main() {
    let my_people = vec![
        Person {
            name: "Bob".to_string(),
        },
        Person {
            name: "Jill".to_string(),
        },
        Person {
            name: "Rakim".to_string(),
        },
    ];
    //map my_people to ["Bob", "Jill", "Rakim"]
}

Answer 1

您有两种可能的解决方案，具体取决于您是要克隆名称还是借用名称。以下两种解决方案:

pub struct Person {
    name: String,
}

fn people_names_owned(people: &[Person]) -> Vec<String> {
    people.iter().map(|p| p.name.clone()).collect()
}

fn people_names_borrowed(people: &[Person]) -> Vec<&str> {
    people.iter().map(|p| p.name.as_ref()).collect()
}

fn main() {
    let my_people = vec![
        Person {
            name: "Bob".to_string(),
        },
        Person {
            name: "Jill".to_string(),
        },
        Person {
            name: "Rakim".to_string(),
        },
    ];
    println!("{:?}", people_names_owned(&my_people));
    println!("{:?}", people_names_borrowed(&my_people));
}

playground