Create a String

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• The first one is a reference to a string embedded in the program. We can only chnage this in the editor. Not while the program is running.
• String::from can create a "real" string from an embedded string. This is also what we get from any input. (STDIN, ARGS, file, network etc.)
• to_string is the method to stringify any value. It works here as well, but we can be clearer with to_owned.
• to_owned convert a reference to an owned string. More about ownership later.

examples/strings/create/src/main.rs

fn main() {
    let text_1 = "Hello World!";
    println!("{text_1}");

    let text_2 = String::from("Hello World!");
    println!("{text_2}");

    let text_3 = "Hello World!".to_string();
    println!("{text_3}");

    let text_4 = "Hello World!".to_owned();
    println!("{text_4}");

    assert_eq!(text_1, "Hello World!");
    assert_eq!(text_1, text_2);
}

Hello World!
Hello World!
Hello World!
Hello World!