Rust Cheat Sheet

Last Updated: November 21, 2025

Variables

fn main() {
    let x = 5; // Immutable
    let mut y = 10; // Mutable
    println!("x: {}, y: {}", x, y);
}


         let x = value

Transfer ownership

&x

Borrow (immutable)


         &mut x

Mutable borrow

💡 Pro Tip: Read compiler error messages carefully - they're very helpful!