From: David Tillman <dtillman@...>
Date: 2001-08-08T02:16:30+09:00
Subject: [ruby-talk:19299] Re: Speaking of the ternary operator....



>>>>> David Alan Black <dblack@candle.superlink.net> writes:

> I seem to remember at one point someone saying that the ternary
> operator might be vanishing from Ruby at some point.  It may
> have been over on irc, or in my fevered imagination.  I'm not
> sure.

> Personally I wouldn't miss it, though that's neither here nor
> there.  I'm just curious about it.


> David

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



  It isn't very pretty.  However; I do use it quite a bit
  to save many lines of if/then/else/end: 

    @border = args[1].include?(H_border) ? args[1][H_border] : 0
    @align = args[1].include?(H_align) ? args[1][H_align] : false
    @spacing = args[1].include?(H_spacing) ? args[1][H_spacing] : false
    @padding = args[1].include?(H_padding) ? args[1][H_padding] : false
    @width = args[1].include?(H_width) ? args[1][H_width] : false
    @bgcolor = args[1].include?(H_bgcolor) ? args[1][H_bgcolor] : false
    @bcolor = args[1].include?(H_bcolor) ? args[1][H_bcolor] : false
    @bclight = args[1].include?(H_bclight) ? args[1][H_bclight] : false
    @bcdark = args[1].include?(H_bcdark) ? args[1][H_bcdark] : false
    @center = args[1].include?(H_center) ? args[1][H_center] : false
    @format = args[1].include?(H_format) ? args[1][H_format] : []


  It could be that there is a better way than how I am currently doing
  this and that I am falling into the trap of trying to duplicate code from one
  language to the paradigm over another - as this similiar to the form
  I wrote in Scheme:

    (let ((align (get-keyword :align args #f))
          (valign (get-keyword :valign args #f))
          (width (get-keyword :width args #f))
          (height (get-keyword :height args #f))
          (nowrap (get-keyword :nowrap args #f))
          (colspan (get-keyword :colspan args #f))
          (rowspan (get-keyword :rowspan args #f))
          (bg-color (get-keyword :bg-color args #f))
          (color (get-keyword :color args #f)))
    ...)


  The ternary is convenient because it is so alike to Scheme's
  (if <expression>  <expression>  <expression>)


  -Dave (One of the other Daves)


-- 
How absolute the knave is!
We must speak by the card, or equivocation will undo us.