From: Martin DeMello <martindemello@...>
Date: 2003-07-18T00:17:03+09:00
Subject: Re: nil_or_empty? on String

Brian Candler <B.Candler@pobox.com> wrote:
> On Thu, Jul 17, 2003 at 11:16:45PM +0900, Chris Morris wrote:
>> I just threw down the following -- it smells like I'm over-complicating 
>> matters here. Is there a more elegant to do this?
> ..
>> I wanted to avoid this:
>> 
>>     if (user.nil? || user.empty?) && !(pswd.nil? || pswd.empty?)
>> 
>> ...which I guess isn't that bad now that I read it, although 
>> nil_or_empty? will come in handy if I need to re-use it a lot.
> 
> We can assume that 'false' is also an invalid value for username/ password -
> since false.empty? raises an exception - in which case,
> 
>     if pswd && !pswd.empty? && (!user || user.empty?)

if [user, pswd].any? {|i| i.nil? || i.empty?}

or, if you want to be terse at the expense of readability

unless [user, pswd].any? {|i| i && i[0]}

or even

if [user, pswd].compact.mapf(:empty?).any?

where mapf is defined in http://www.rubygarden.org/ruby?AutoMap

martin