From: dblack@...
Date: 2002-10-22T06:33:11+09:00
Subject: Re: functional Ruby equiv to this perl snippet

Hi --

On Tue, 22 Oct 2002, Mirian Crzig Lennox wrote:

> On Tue, 22 Oct 2002 05:54:49 +0900, Bob X <bobx@linuxmail.org> wrote:
> >
> >Cool..but what if serverlist.txt does not exist? The one thing I do like
> >about Perl is the "open file or die" test. I believe that I am "stuck" with
> >a rescue clause which is sometimes confusing for me (a newbie) to use when
> >it is located within a "def".
>
> You can do something very similar in Ruby, using "fail" instead of "die".
> For example:
>
> 	def open_file name
> 	  f = File.open(name) or fail "couldn't open #{name}"
> 	  return f
>         end


If an exception is raised by the open, though, the fail clause will
not be executed:

  $ ruby -e 'File.open("NO_FILE") or fail "Not reached"'
  -e:1:in `open': No such file or directory - "NO_FILE" (Errno::ENOENT)
	  from -e:1


David

-- 
David Alan Black
home: dblack@candle.superlink.net
work: blackdav@shu.edu
Web:  http://pirate.shu.edu/~blackdav