From: "David A. Black" <dblack@...>
Date: 2005-07-26T00:26:13+09:00
Subject: Re: Newby question 'unless'

Hi --

On Tue, 26 Jul 2005, David A. Black wrote:

> Hi --
>
> On Tue, 26 Jul 2005, EdUarDo wrote:
>
>> Hi all, I'm overriding to_s method and I want to
>> print an attribute if a condition is fulfilled.
>> 
>> def to_s
>>  "#{@a}" + "#{@b}" unless @a == 0
>> end
>> 
>> That sentence doesn't print anything when @a == 0 but what I want to do
>> is to not print @b when @a == 0.
>
> If it doesn't print anything then presumably it's not printing @b.  Or
> did you mean that last @a to be @b?  If so, you could do:
>
>  def to_s
>    "#{@a unless @a.zero?}#{@b unless @b.zero?}"
>  end

I think I figured out what you want :-)  You always want @a, and you
only want @b if @a is not zero:

   "#{@a}#{@b unless @a.zero?}"


David

-- 
David A. Black
dblack@wobblini.net