Difference between String and str in Rust example

In Rust, We have different below string objects.

Let’s see the difference between String and Str types in Rust.

What is the difference between String and Str in Rust?

String: It is std::String, String data type, and data stored on Heap str: It is a primitive String type in Rust used as a String slice or literal that point to a Fixed UTF-8 byte array, Represents as *Char.

str accessed using &str The string has capacity and length

fn main() {
    let mut msg = String::from("Welcome");
    println!("{}", s.capacity()); // returns 7
    msg.push_str("John");
    println!("{}", s.len()); // returns 11
}

str has no capacity method and only the length method.

fn main() {
    let msg = "Welcome";
    println!("{}", msg.capacity()); 
    println!("{}", msg.len());
    
}