4. Understanding Ownership

Learning objectives

let x = String::from("hello");
let x2 = x;
println!("{x}");

let x = String::from("hello");
take_ownership(x);
println!("{x}");

fn take_ownership(_name: String) {
  ()
}

let x = String::from("hello");
take_ownership(x.clone());
println!("{x}");

fn take_ownership(_name: String) {
  ()
}

let x = 1;
println!("{x}");
println!("{x}");

let x = Box::new(1);
take_ownership(x);
println!("{x}");

fn take_ownership(_name: Box<i32>) {
  ()
}

let x = String::from("hello");
borrow(&x);
println!("{x}");

fn borrow(_name: &String) {
  ()
}

let x = String::from("hello");
let x2 = &x;

borrow(&x);
println!("{x2}");

fn borrow(_name: &String) {
  ()
}

let mut x = String::from("hello");

let x2 = &x;

borrow(&mut x);

println!("{x2}");

fn borrow(_name: &mut String) {
  ()
}

let hello = "hello";
there(hello);

fn there(hello2: &str) {
  println!("{hello2} there")
}

let hello = String::from("hello");
there(&hello);

fn there(hello2: &str) {
  println!("{hello2} there")
}

4. Understanding Ownership