[Rust] Ownership(소유권) 기초 예제 : Vec<String> (34일차)

 

<Vec Part>

[예제 코드_1]

fn main() {
    let names = vec![
       String::from("John"),
       String::from("Jane"),
   ];
    do_something(names);
}

fn do_something(names: Vec<String>) {
    println!("{:?}", names);
}

 

[실행 결과]

["John", "Jane"]

 

---

 

[예제 코드_2]

fn main() {
    let names = vec![
        String::from("John"),
        String::from("Jane"),
   ];
    do_something(names);
    println!("{:?}", names);
}

fn do_something(names: Vec<String>) {
    println!("{:?}", names);
}

 

[실행 결과]

error[E0382]: borrow of moved value: `names`
 --> src/main.rs:7:22

 

---

 

[예제 코드_3]

fn main() {
    let names = vec![
       String::from("John"),
       String::from("Jane"),
   ];
    println!("{:?}", names);
    do_something(names);
}

fn do_something(names: Vec<String>) {
    println!("{:?}", names);
}

 

[실행 결과]

["John", "Jane"]
["John", "Jane"]

 

---

 

[예제 코드_4]

fn main() {
    let names = vec![
       String::from("John"),
       String::from("Jane"),
   ];
    do_something(&names);
    println!("{:?}", names);
}

fn do_something(names: &[String]) {
    println!("{:?}", names);
}

 

[실행 결과]

["John", "Jane"]
["John", "Jane"]

 

---

 

[예제 코드_5]

fn main() {
    let names = vec![
       String::from("John"),
       String::from("Jane"),
  ];
    do_something(names.clone());
    println!("{:?}", names);
}

fn do_something(names: Vec<String>) {
    println!("{:?}", names);
}

 

[실행 결과]

["John", "Jane"]
["John", "Jane"]

 

---

 

[예제 코드_6]

fn main() {
    let names = vec![
       String::from("John"),
       String::from("Jane"),
   ];
    let name: String = names[0];
    println!("Hello, {}", name);
}

 

[실행 결과]

error[E0507]: cannot move out of index of `Vec<String>`
 --> src/main.rs:6:24

 

---

 

[예제 코드_7]

fn main() {
    let names = vec![
       String::from("John"),
       String::from("Jane"),
   ];
    let name: &str = &names[0];
    println!("Hello, {}", name);
}

 

[실행 결과]

Hello, John

 

---

 

[예제 코드_8]

fn main() {
    let names = vec![
       String::from("John"),
       String::from("Jane"),
   ];
    let name: &str = 
    names.get(0).unwrap();
    println!("Hello, {}", name);
}

 

[실행 결과]

Hello, John

 

---

 

[예제 코드_9]

fn main() {
    let names = vec![
       String::from("John"),
       String::from("Jane"),
   ];
    let name: &str = 
    names.first().unwrap();
    println!("Hello, {}", name);
}

 

[실행 결과]

Hello, John

 

---

 

[예제 코드_10]

fn main() {
    let names = vec![
       String::from("John"),
       String::from("Jane"),
   ];
    let mut names_iter = 
    names.into_iter();
    let name: String = 
    names_iter.next().unwrap();
    println!("Hello, {}", name);
}

 

[실행 결과]

Hello, John

 

---

 

[예제 코드_11]

fn main() {
    let mut names = vec![
       String::from("John"),
       String::from("Jane"),
   ];
    let name: String = names.pop()
    .unwrap();
    println!("Hello, {}", name);
}

 

[실행 결과]

Hello, Jane

 

 

 

---

 

<참조 1> https://itnext.io/rust-ownership-50-code-examples-96203fcf79ea