Variables

Rust provides type safety via static typing. Variable bindings are made with let:

fn main() {
    let x: i32 = 10;
    println!("x: {x}");
    // x = 20;
    // println!("x: {x}");
}

This slide should take about 5 minutes.

Uncomment the x = 20 to demonstrate that variables are immutable by default. Add the mut keyword to allow changes.
The i32 here is the type of the variable. This must be known at compile time, but type inference (covered later) allows the programmer to omit it in many cases.

Comprehensive Rust 🦀