cairo by example

if expression

An if expression is a control flow construct that allow us to conditionally execute a piece of code depending on the value of a boolean condition. Since it is an expression, it returns the value of the last expression in the branch.

use debug::PrintTrait;

fn main() {
    let is_awesome = true;

    if is_awesome {
        'Cairo is awesome!'.print();
    }
}

You can combine several conditions using boolean operators like && (and), || (or), etc. You can also add an optional else-branch like in many other programming languages.

use debug::PrintTrait;

fn main() {
    let version: u8 = 2;
    let is_awesome = true;

    if is_awesome && version > 0 {
        'Lets code!'.print();
    } else {
        'Great things are coming'.print();
    }
}