Rust) What are the differences between String and str?차이점String vs str

Easy Rust 한글 강의

프로그래밍 언어 러스트를 배웁시다! 015 Easy Rust in Korean: String methods

https://youtu.be/MebpscwF7L4

 

 

 

 

 

 

 1 fn main() {
 2     let mut my_name = String::with_capacity(26);
 3     println!(
 4         "Length is {} and capacity is : {}",
 5         my_name.len(),
 6         my_name.capacity()
 7     );
 8 
 9     my_name.push_str("David!");
10     println!(
11         "Length is {} and capacity is : {}",
12         my_name.len(),
13         my_name.capacity()
14     );
15 
16     my_name.push_str(" and I live in Seoul");
17     println!(
18         "Length is {} and capacity is : {}",
19         my_name.len(),
20         my_name.capacity()
21     );
22 
23     my_name.push('a');
24     println!(
25         "Length is {} and capacity is : {}",
26         my_name.len(),
27         my_name.capacity()
28     );
29 }
30

 

fn main() {
    let mut my_name = String::with_capacity(26);
    println!(
        "Length is {} and capacity is : {}",
        my_name.len(),
        my_name.capacity()
    );

    my_name.push_str("David!");
    println!(
        "Length is {} and capacity is : {}",
        my_name.len(),
        my_name.capacity()
    );

    my_name.push_str(" and I live in Seoul");
    println!(
        "Length is {} and capacity is : {}",
        my_name.len(),
        my_name.capacity()
    );

    my_name.push('a');
    println!(
        "Length is {} and capacity is : {}",
        my_name.len(),
        my_name.capacity()
    );
}

 

 

결과 

   Compiling training_rustacean_rust v0.1.0 (/Users/globalyoung/Documents/Project/Github/rust_project/training_rustacean_rust)
    Finished dev [unoptimized + debuginfo] target(s) in 0.33s
     Running `target/debug/training_rustacean_rust`
Length is 0 and capacity is : 26
Length is 6 and capacity is : 26
Length is 26 and capacity is : 26
Length is 27 and capacity is : 52

 

 

 

Why does Rust have String and str? What are the differences between String and str? When does one use String instead of str and vice versa? Is one of them getting deprecated?


https://stackoverflow.com/questions/24158114/what-are-the-differences-between-rusts-string-and-str

What are the differences between Rust's `String` and `str`?

https://www.ameyalokare.com/rust/2017/10/12/rust-str-vs-String.html

Rust: str vs String

---

Why does Rust have different types of Strings? Why not just one String type?"
https://dev.to/stevepryde/rust-string-vs-str-1l93

Rust String vs &str

---