string and str to string rust

To convert a str to a String in Rust, you can use the to_string() method. This method is available on the str type and returns a new String that contains the same characters as the original str. Here's an example:

let my_str = "Hello, world!";
let my_string = my_str.to_string();

In this example, the to_string() method is called on the my_str variable, which is of type &str. The method returns a new String that is assigned to the my_string variable.

Similarly, if you have a String and you want to convert it to a str, you can use the as_str() method. This method returns a reference to the str slice of the String. Here's an example:

let my_string = String::from("Hello, world!");
let my_str = my_string.as_str();

In this example, the as_str() method is called on the my_string variable, which is of type String. The method returns a reference to the str slice of the String, which is assigned to the my_str variable.

Please note that the as_str() method returns a reference to the str slice, not a new str value. This means that the my_str variable will have the same lifetime as the my_string variable.