From: William James <w_a_x_man@...>
Date: 2007-01-29T14:30:09+09:00
Subject: Re: Help DRY a couple ifs



On Jan 28, 5:27 pm, Bil Kleb <Bil.K...@NASA.gov> wrote:
> The following snippet is simply nasty, but I
> can't see a simple way to DRY it:
>
>    if data['medium'].has_key? xyz
>      medium = data['medium'][xyz]
>    else
>      $stderr.print "Warning: Did not locate point in medium mesh: "
>      $stderr.puts xyz.join(',')
>      next
>    end
>    if data['fine'].has_key? xyz
>      fine = data['fine'][xyz]
>    else
>      $stderr.print "Warning: Did not locate point in fine mesh: "
>      $stderr.puts xyz.join(',')
>      next
>    end
>
> I suspect my lack of eval knowledge may be
> the trouble, but that may be a good thing?
>
> Thanks,
> --
> Bil Klebhttp://fun3d.larc.nasa.gov

If the hash isn't autovivifying (if refering to a non-existant entry
won't create an entry):

medium = data['medium'][xyz] or
  (   $stderr.print "Warning: Did not locate point in medium mesh: "
      $stderr.puts xyz.join(',')
      next )