function -> func -> fun -> fn. Ok, here we are

It is possible to define functions in your programs.
Arguments are positional.

Example:

fn square(x) {

    return x^2;

}

The last function argument can be a parameter name followed by "..."
In this case the function can take a variable number of arguments which are accesible through a list named as the last parameter.

Example:

fn compare_many(x, others...) {

  for (i : 0; i < len(others); i : i + 1) {

    if (x > [others,i]) {

       output str(x) + " is greater than " + str([others,i]);

    }

    if (x < [others,i]) {

       output str(x) + " is less than " + str([others,i]);

    }

    if (x == [others,i]) {

       output str(x) + " is equal to " + str([others,i]);

    }

  }

}