From: ahoward <ahoward@...>
Date: 2002-11-26T11:25:02+09:00
Subject: Re: Default value of property

On Tue, 26 Nov 2002, Hal E. Fulton wrote:

> I did try this, which doesn't work:
>
>   x = obj.property.meth rescue default_value
>
> I'm not sure why it doesn't work, and I think
> it would be nice if it did.

rescue doesn't normally catch NameErrors

this will work

  /scratch > irb
  irb(main):001:0> begin
  irb(main):002:1*   foo
  irb(main):003:1> rescue NameError
  irb(main):004:1>   puts 'did not define foo...'
  irb(main):005:1> end
  did not define foo...


this won't

  irb(main):006:0> begin
  irb(main):007:1*    foo
  irb(main):008:1> rescue
  irb(main):009:1>    puts 'did not define foo...'
  irb(main):010:1> end
  NameError: undefined local variable or method `foo' for #<Object:0x401dbce0> from (irb):7


this has confused me on several occasions, though it kind of make sense...

-a


-- 

 ====================================
 | Ara Howard
 | NOAA Forecast Systems Laboratory
 | Information and Technology Services
 | Data Systems Group
 | R/FST 325 Broadway
 | Boulder, CO 80305-3328
 | Email: ahoward@fsl.noaa.gov
 | Phone:  303-497-7238
 | Fax:    303-497-7259
 ====================================