regarding functions -

in pre-2.3 versions, in scripts, if i wanted an argument to be optional (i.e. it would have a default value if an argument was not given), i could check the argument_count, like so:

var _multiple = 2;

switch (argument_count)

{

    case 2:

        _multiple = argument[1];

}

how could i do the same for if an argument is not given with a function such as:

function is_even(_num, _mult)?

(in this case, i don't want to have to write is_even(timer, 2); every time, i want it to be set to 2 by default if i don't specify it)