From: Robert Dober <robert.dober@...>
Date: 2007-07-21T17:15:08+09:00
Subject: Re: RCR? Added syntax for chains that possibly return nil

On 7/21/07, Daniel DeLorme <dan-ml@dan42.com> wrote:
> Stefan Rusterholz wrote:
> > Trans wrote:
> >> Sure. I realize. I'm only pointing out that this -> operator is
> >> equivalent to a rescue NoMethodError,
> >
> > So how can I explain to you that it *isn't*?
>
> rescue NoMethodError has the same disadvantage as rescue StandardError;
> it may catch errors that you did not intend to. e.g.:
<snip>
This is a little detail I have overseen in the discussion
-> *is not* equivalent to rescue NoMethodError, if I have understood correctly

a-> b
is

begin
  a.b
rescue NoMethodError
  raise unless a.nil?
  ===========
end

Robert

-- 
I always knew that one day Smalltalk would replace Java.
I just didn't know it would be called Ruby
-- Kent Beck