From: Nikolai Weibull <now@...>
Date: 2011-10-14T22:41:36+09:00
Subject: Re: What’s the best way of checking if an argument has been given or not?

On Fri, Oct 14, 2011 at 15:29, Bartosz Dziewoński <matma.rex@gmail.com> wrote:
> You can use this syntax, too. "args" becomes an array of all arguments given.
>
>  def foo *args
>    if args.length==0
>      puts 'no argument was given'
>    else
>      puts args[0]
>    end
>  end
>
> If you only allow one argument, you should do some checking whether
> there are too many.

Your suggestion is valid. though it seems I underspecified my question
in yet another way.  Until Ruby gets a rb_scan_args equivalent, I’d
rather not complicate my argument processing unnecessarily by
destructuring an argument array by hand.