From: Nikolai Weibull <now@...>
Date: 2011-10-14T22:28:55+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 15:07, jake kaiden <jakekaiden@yahoo.com> wrote:
> ...probably not the *best* way, but this works:
>
>  class A
>  def initialize(arg = "NO ARGUMENT")
>    if arg == "NO ARGUMENT"
>      puts "no argument given"
>    else
>      puts arg
>    end
>  end
>  end

Perhaps I wasn’t clear enough.  It shouldn’t be possible for the
caller to actually pass in an argument that will match.

A.new('NO ARGUMENT') # => no argument given