Functions definitions and expression

In GLaDOS, functions can be expressed as such:

function hello_world() {
    print("Hello World!");
}

Here, the function keyword is followed by the name of the function, then by a list of parameters between parentheses (none in this case), and finally by a block of statements.

function is_prime(x) {
    if (typeOf(x) != "integer" or x <= 1) {
        return False;
    }
    end = int(sqrt(x)) + 1;

    for (n = 2; n < end; n = n + 1) {
        if (x % n == 0) {
            return False;
        }
    }
    return True;
}

This function is here to highlight the use of an argument in a function. The is_prime function takes an argument x and returns True if x is a prime number, False otherwise.