From: Joel Pearson <lists@...>
Date: 2013-02-06T06:05:23+09:00
Subject: Re: using an instance variable inside a method

$ = global
@@ = class
@ = instance

Ruby is clever enough to figure out that you mean self.price (using the 
attr_accessor for @price) when you state "price" in the method. Of 
course, you could create a local variable called "price" within that 
code which would temporarily override the reference.

For example, modifying the class:

class BookInStock
 def price_in_cents
    price = 1
    Integer(price*100 + 0.5)
  end
end

> book.price
=> 33.8
> puts "Price in cents = #{book.price_in_cents}"
Price in cents = 100
=> nil
> book.price
=> 33.8

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