Expressions

Rust programming is a bunch of statements mostly. There are a few kinds of statements, one being an expression. (another is variable binding)

Blocks are expressions as well

fn main() {
    let x = 5u32;
 
    let y = {
        let x_squared = x * x;
        let x_cube = x_squared * x;
 
        // This expression will be assigned to `y`
        x_cube + x_squared + x
    };
 
    let z = {
        // The semicolon suppresses this expression and `()` is assigned to `z`
        2 * x;
    };
 
    println!("x is {:?}", x);
    println!("y is {:?}", y);
    println!("z is {:?}", z);
}