Ownership - Rust Programming

Each heap value has one owner. Assigning a String moves ownership, so the original name can no longer be used.

Program

Play the program to watch s1 move into s2.

ownership_move.rs

fn main() {
    let s1 = String::from("hello");
    let s2 = s1;
    let len = s2.len();
    println!("{s2} {len}");
}

ownership A `String` owns heap memory through a single binding.

move `let s2 = s1` moves ownership; `s1` is no longer usable.

len `s2.len()` returns the byte length of the string.