From: "ara.t.howard" <ara.t.howard@...>
Date: 2008-01-07T02:20:46+09:00
Subject: Re: Programmatically creating a local variable using a symol


On Jan 6, 2008, at 9:34 AM, tho_mica_l wrote:

> nice if it could look somewhat like this:
>
>     val = Foo(1, 2)
>
>     case val
>     when Foo(:x, :y)
>         a = x * y
>     when Bar(:x)
>         a = x
>     end


invert the var binding: make them instance variables and it falls out  
easily:

class Foo
   attr :x, :y
   def initialize x, y
     @x, @y = x, y
   end
end
def Foo(*a, &b) Foo.new(*a, &b) end

class Bar < Foo; end
def Bar(*a, &b) Bar.new(*a, &b) end



val = Foo 1, 2

a =
   case val
     when Foo
       val.x * val.y
     when Bar
       val.x
   end



a @ http://codeforpeople.com/
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