Strings

• String

  • little slower.
  • has more functions.
  • it is a pointer with a data in the heap.
  • Owned type.

  • // we can create String like this:
    fn main(){
    let var = String::from("Hello, World");
    let var = "Elie".to_string();
    }
    

• &str

  • string slice
  • Simple String
  • let var = "hello, world";
  • fast
  • "&" because it is a reference to use str.

🚀 format! => Creates a String

fn main() {
    let my_name = "Billybrobby";
    let my_country = "USA";
    let my_home = "Korea";

    let _together = format!(
        "I am {} and I come from {} but I live in {}.",
        my_name, my_country, my_home
    );
}

🚀 into! => makes an owned type.

// this will not work because Rust doesn't know which owned type you want. Many types can be made form a &str
fn main() {
    let my_string = "Try to make this a String".into(); // ⚠️
}

fn main() {
    let my_string: String = "Try to make this a String".into(); // ✔️
}