From: William James <w_a_x_man@...>
Date: 2005-02-14T06:44:56+09:00
Subject: Re: "Joining" strings which may be nil (or) Handling Option hashes

Robert Klemme wrote:
>
> Here's a more efficient variant - using #inject of course :-)
>
> >> opts.inject(nil){|s,(k,v)| v ? (s ? s << " and " : "") << k << "="
<< v :
> >> s}
> => "title=ruby and author=dave and publisher=oreilly"


I prefer this:

opts.to_a.map{|x| x.join('=') if x[1]}.compact.join(' and ')

---->  "title=ruby and author=dave and publisher=oreilly"