From: Adam Prescott <adam@...>
Date: 2011-10-05T00:11:22+09:00
Subject: Re: Operator Overloading

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On Tue, Oct 4, 2011 at 3:53 PM, Darryl L. Pierce <mcpierce@gmail.com> 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()

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