While Loops

Learn how to execute iterative logic dynamically using condition-controlled while loops.

Basic While Loop

The while loop continues executing its block as long as the conditional expression evaluates to truthy:

let count: int = 1;

while count <= 5 {
    print("Count:", count);
    count += 1;
}

Practical Algorithm: Prime Checker with While

Here is an example demonstrating a while loop used inside a prime-checking function:

fun is_prime(n: int) -> bool {
    if n <= 1 {
        return false;
    }

    let divisor: int = 2;
    while divisor * divisor <= n {
        if n % divisor == 0 {
            return false;
        }
        divisor += 1;
    }
    return true;
}

print(is_prime(29)); // true
print(is_prime(30)); // false