Infinite Loop

Infinite loops follow Rust syntax.

continue can be used to skip to the next iteration, by-passing all following statements; break can be used to break out of the loop unconditionally.

let x = 10;

loop {
    x -= 1;

    if x > 5 { continue; }  // skip to the next iteration

    print(x);

    if x == 0 { break; }    // break out of loop
}

Loop Expression

loop statements can also be used as expressions.

The break statement takes an optional expression that provides the return value.

The default return value of a loop expression is ().

let x = 0;

// 'loop' can be used just like an expression
let result = loop {
    if is_magic_number(x) {
        // if the loop breaks here, return a specific value
        break get_magic_result(x);
    }

    x += 1;

    // ... if the loop exits here, the return value is ()
};

if result == () {
    print("Magic number not found!");
} else {
    print(`Magic result = ${result}!`);
}