From: "David A. Black" <dblack@...>
Date: 2010-01-01T20:15:03+09:00
Subject: Re: Why can't I use "or" here?

Hi --

On Thu, 31 Dec 2009, Phillip Gawlowski wrote:

> On 31.12.2009 06:32, Albert Schlef wrote:
>
>> It works. But, I must say, it isn't as beautiful as my original plan. It
>> doesn't read as English.
>
> PS C:\Scripts> ruby .\unless.rb
> ./unless.rb:1: Argument error (RuntimeError)
> PS C:\Scripts> ruby .\unless.rb "arg"
> PS C:\Scripts> cat .\unless.rb
> raise "Argument error" unless ARGV[0]
> PS C:\Scripts>
>
> I prefer it that way. :)
>
> Works in 1.8.6 and 1.9.1, too, to my great relief.

It even works in 1.0:

$ ruby10 -ve 'raise "Argument error" unless ARGV[0]'
ruby - version 1.0-971225 (i686-linux)
-e:1: RuntimeError: Argument error

I wouldn't worry about that idiom ceasing to work :-)


David

-- 
David A. Black
Senior Developer, Cyrus Innovation Inc.
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