From: Robert Dober <robert.dober@...>
Date: 2007-01-19T22:15:33+09:00
Subject: Re: auto assign arguments?

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On 1/19/07, dblack@wobblini.net <dblack@wobblini.net> wrote:
>
> Hi --
>
> On Fri, 19 Jan 2007, David Chelimsky wrote:
>
> > Wow. You guys are all coming up w/ great alternatives, but would
> > somebody please just answer my question? I am not asking for ways to
> > do what I want. I'm asking if you think the following proposed syntax
> > addition would be useful:
> >
> > Any parameter preceded by a @ results in an instance variable being
> > created and initialized with the submitted value. So:
> >
> > class MyClass
> > def initialize(@a)
> > end
> > end
> >
> > instance = MyClass.new(5)
> > #results in an instance variable @a with a value of 5
>
> That was proposed as an RCR and rejected; see
> http://oldrcrs.rubypal.com/rejected.html#rcr3
>
>
> David
>
> --
> Q. What is THE Ruby book for Rails developers?
> A. RUBY FOR RAILS by David A. Black (http://www.manning.com/black)
>     (See what readers are saying!  http://www.rubypal.com/r4rrevs.pdf)
> Q. Where can I get Ruby/Rails on-site training, consulting, coaching?
> A. Ruby Power and Light, LLC (http://www.rubypal.com)
>
>
It was rejected more than 5 years ago and without any reason. The RCR was
very short. I feel that this could be presented again, be motivated much
better (e.g. indicating that instance variables can be block parameters)
etc.etc.

Right now you can *already* write code like this

class B
    attr_reader :a
    define_method :initialize do |@a| ; end
end
b=B.new 42
b.a  => 42


I feel that this is worth another shot, maybe Matz could tell us to stop
working on this if he really does not like it.
It seems reasonable to assume that the reasons he had to reject the RCR do
not exist anymore or that he has changed his mind, no?

Cheers
Robert


-- 
"The best way to predict the future is to invent it."
- Alan Kay

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