From: "Darryl L. Pierce" <mcpierce@...>
Date: 2011-10-05T00:31:39+09:00
Subject: Local vs method vs instance (was: Operator Overloading)

On 10/04/2011 11:11 AM, Adam Prescott wrote:
>>> (Of course, 'x' and 'self.x' are the same; you can write 'self.x' if you
>>> think it's clearer)
>>
>> I don't think so. 'x' is a local variable, while '@x' is an instance
>> variable. And since the fields are instance variables they have to be
>> prefixed with '@'.
>>
> 
> Not quite. :)
> 
> class Foo
>   attr_reader :x
> 
>   def initialize(x)
>     @x = x
>   end
> 
>   def bar
>     x # :)
>   end
> end
> 
> f = Foo.new(1)
> puts f.bar
> 
> http://ideone.com/mbPc0
> 
> If there's no local variable in the scope, the interpreter sees it as a
> method call. If it's ambiguous, it'll pick the variable over the method
> call, unless you force it with a trailing ().
> 
> x = 1
> def x; 2; end
> puts x
> puts x()

Okay, then this flies in the face of how I understood variables. I would
have thought the act of having 'x' in the definition for bar in the
above created a local variable in the current scope.

-- 
Darryl L. Pierce <mcpierce@gmail.com>
http://mcpierce.multiply.com/
"What do you care what people think, Mr. Feynman?"