From: ahoward <ahoward@...>
Date: 2003-01-30T04:48:04+09:00
Subject: Re: Local variables & blocks

On Wed, 29 Jan 2003, Martin DeMello wrote:

<snip>
> Why, though? I can't think of a case where I'd need to know a variable was
> undefined,
<snip>

  result =
    if callback
      callback (*args)
    else
      default_callback (*args)
    end

or more generally

  object and object.method

the ol 'call a method on object if object is not nil'

or even

  size = array && array.size || -1

which i do all the time.

-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
 ====================================