From: Albert Schlef <albertschlef@...>
Date: 2010-02-08T07:23:58+09:00
Subject: Re: Symbols and class veriable

Jerome David Sallinger wrote:
> Hello, Is the any connection between a symbol and a class variable. For
> example, if I declare the variable @red_car_speed is this aliased or
> connected by :red_car_speed. The section of code that is confuring me
> is:
> 
>     control_panel do |c|
>       c.slider :red_car_speed, -5..15
>       c.slider :blue_car_speed, -5..15
>     end
[...]
>     @red_car_speed = 1
>     @blue_car_speed = 2

@something and :something aren't linked.

It happens that the slider() method gets the name of a variable whose 
value it will change as the user interacts with the slider. This 
technique, of seemingly extending Ruby's syntax, is known as 
"metaprogramming".

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