From: Phillip Gawlowski <cmdjackryan@...>
Date: 2011-10-15T06:11:15+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 5:31 PM, Jens Wille <jens.wille@uni-koeln.de> wrote:
> luke gruber [2011-10-14 17:15]:
>> That way, the instance won't be available across classes and you
>> can just check if the argument responds_to :missing?
> or you can just do this:
>
> class A
>
>  def b(c = d = true)  # or some other truthy value
>    if d
>      puts 'no argument was given'
>    else
>      puts c
>    end
>  end
>
> end

The downside to this approach is that you use "true" to say something
is "false".

-- 
Phillip Gawlowski

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A method of solution is perfect if we can forsee from the start,
and even prove, that following that method we shall attain our aim.
              -- Leibniz