Path: csiph.com!x330-a1.tempe.blueboxinc.net!aioe.org!feeder.news-service.com!de-l.enfer-du-nord.net!feeder2.enfer-du-nord.net!talisker.lacave.net!lacave.net!not-for-mail
From: Joel VanderWerf <joelvanderwerf@gmail.com>
Newsgroups: comp.lang.ruby
Subject: Re: Help with while condition OR condition
Date: Sat, 7 May 2011 17:56:47 -0500
Organization: Service de news de lacave.net
Lines: 55
Message-ID: <4DC5CE2A.9070402@gmail.com>
References: <fe6567119d5fbe466a7c6d2885d4718a@ruby-forum.com>
NNTP-Posting-Host: bristol.highgroove.com
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 7bit
X-Trace: talisker.lacave.net 1304809064 23440 65.111.164.187 (7 May 2011 22:57:44 GMT)
X-Complaints-To: abuse@lacave.net
NNTP-Posting-Date: Sat, 7 May 2011 22:57:44 +0000 (UTC)
In-Reply-To: <fe6567119d5fbe466a7c6d2885d4718a@ruby-forum.com>
X-Received-From: This message has been automatically forwarded from the ruby-talk mailing list by a gateway at comp.lang.ruby. If it is SPAM, it did not originate at comp.lang.ruby. Please report the original sender, and not us. Thanks! For more details about this gateway, please visit: http://blog.grayproductions.net/categories/the_gateway
X-Mail-Count: 382793
X-Ml-Name: ruby-talk
X-Rubymirror: Yes
X-Ruby-Talk: <4DC5CE2A.9070402@gmail.com>
Xref: x330-a1.tempe.blueboxinc.net comp.lang.ruby:4083

On 05/07/2011 03:37 PM, Bill W. wrote:
> Hi everyone,
>
> This is my first post, so I hope I don't sound too inexperienced..
>
> I'm trying to teach myself Ruby, and have run into an issue with a while
> statement that will break if an input is "exit" or "quit".
> As of right now, it works if exit is input, but not quit
>
> I know I am completely misusing the entire thing, but here is what I
> came up with:
>
> EXIT = "exit"  #need constants since Ruby gets pissed at string literals
> QUIT = "quit"  #in a comparison
>
> print "Input: "
> input = gets
> while input.chomp.downcase != (EXIT || QUIT) #only works for exit

It can help to take apart expressions in irb (interactive ruby):

$ irb
 >> EXIT = "exit"
=> "exit"
 >> QUIT = "quit"
=> "quit"
 >> EXIT || QUIT
=> "exit"
 >> "quit" == (EXIT || QUIT)
=> false

>    #Do something
>
> print "Input: "  #pick up the next input and check it
> input = gets
> end
>
> I know that Ruby has a lot of shortcuts, but if you post any please
> explain how they work (or provide a link to a good explanation.

Something to tinker with:

print "Input: "
while input = gets
   case s = input.chomp.downcase
   when "exit", "quit"
     puts "You wanted to #{s} this mighty fine program?"
     break
   else
     puts "Why do you say '#{s}'?"
     print "Input: "
   end
end
puts "Done."