From: "David A. Black" <dblack@...>
Date: 2005-07-26T04:25:58+09:00
Subject: Re: Newby question 'unless'

Hi --

On Tue, 26 Jul 2005, Patrick Gundlach wrote:

> Hello David,
>
>> Conditionals give you nil when they're not met, and nil.to_s is an
>> empty string, so you don't have to specify a literal empty string in
>> cases like this.
>
> Sure, but not in the case I posted:
>
>>  def to_s
>>   "#{@a}" +  (@a == 0 ? "" : "#{@b}" )
>>  end
>
>
> -:4:in `+': cannot convert nil into String (TypeError)

Whoops, I thought I was being helpful by showing an intermediate step
but indeed that + nil would not work :-)


David

-- 
David A. Black
dblack@wobblini.net