TRPL/CH04

ownership_scope.rs

fn main() {
  let s = String::from("hello");

  takes_ownership(s);

  let x = 5;

  makes_copy(x);
}

fn takes_ownership(some_string: String){
  println!("{}", some_string);
}

fn makes_copy(some_integer: i32){
  println!("{}", some_integer);
}

reference_slice.rs

fn main() {
    let my_string = String::from("Hello world");
    println!("{}", first_word(&my_string[..]));
}


fn first_word(s: &str) -> &str {
  let bytes = s.as_bytes();

  for (i, &item) in bytes.iter().enumerate() {
    if item == b' '{
      return &s[0..i];
    }
  }

  &s[..]
}