On Thu, 22 Jul 2004 12:42:02 +0900, Martin Pirker
<crf / sbox.tu-graz.ac.at> wrote:
> Hello...
> 
> irb(main):040:0> width = nil
> => nil
> irb(main):041:0> "door#{" and width #{width}" if width}"
> => "door"
> irb(main):042:0> width = 99
> => 99
> irb(main):043:0> "door#{" and width #{width}" if width}"
> => "door and width 99"
> irb(main):044:0> "door#{" and width=#{width}" if width}"
> irb(main):045:0*
> 
> I'm stuck :-/
> 
> - why does the = change something - other chars work?
> - how to fix it?

The problem is partially in irb. Your code works if you put it in a Ruby file
and go from there. However, your code will be easier to understand and even irb
gets it if you switch one of the two quoted strings to use an
alternative quote, e.g.,

  irb(main):001:0> width = nil
  => nil
  irb(main):002:0> %Q(door#{" and width #{width}" if width})
  => "door"
  irb(main):003:0> %Q(door#{" and width=#{width}" if width})
  => "door"
  irb(main):004:0> width = 99
  => 99
  irb(main):005:0> %Q(door#{" and width #{width}" if width})
  => "door and width 99"
  irb(main):006:0> %Q(door#{" and width=#{width}" if width})
  => "door and width=99"

-austin
-- 
Austin Ziegler * halostatue / gmail.com
               * Alternate: austin / halostatue.ca