From: Ross Bamford <rosco@...>
Date: 2006-01-01T03:17:55+09:00
Subject: Re: Optional arguments and default values

On Sat, 31 Dec 2005 12:58:14 -0000, Robert Klemme <bob.news@gmx.net> wrote:

> Ross Bamford <rosco@roscopeco.remove.co.uk> wrote:
>> Maybe:
>> def foo(*args)
>>   args.empty? && "qwerty" or args.inject(0) { |s,i| s * i }
>> end
>>
>> or:
>>
>> def foo(*args)
>>   if args.empty?
>>     "qwerty"
>>   else
>>     args.inject(0) { |s,i| s * i }
>>   end
>> end
>
> The implementation of Enumerable#inject allows for an even more elegant  
> solution
>
> def foo(*args)
>   args.inject {|a,b| a*b} || "qwerty"
> end
>
>>> foo 2,3,5
> => 30
>>> foo 2,3
> => 6
>>> foo 2
> => 2
>>> foo
> => "qwerty"
>
> Note: if args is empty this inject returns nil, if there is just one  
> element that is returned.
>

Cool, I didn't know that, thanks for pointing it out :)

Cheers,

-- 
Ross Bamford - rosco@roscopeco.remove.co.uk