From: Robert Dober <robert.dober@...>
Date: 2007-01-12T23:30:09+09:00
Subject: Re: RCR Opinion Poll

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On 1/12/07, dblack@wobblini.net <dblack@wobblini.net> wrote:
>
> Hi --
>
> On Fri, 12 Jan 2007, Alexandru E. Ungur wrote:
>
> >>>> sender: "Robert Dober" date: "Fri, Jan 12, 2007 at 06:56:08PM +0900"
> <<<EOQ
> >> [..]
> >>
> >> The following is a very common pattern.
> >>
> >>    an_enum.map{ |ele| ele.a_method }
> >>
> >> I believe that it is sufficiently common to be generalized.
> >>
> >> There are two idioms I would like to see
> >>
> >>   an_enum.apply_to_all :a_method
> >
> > Ok, I'm still a newbie, but why not extend map instead of introducing a
> > new method? As in:
> >
> >    %w[apples oranges kiwi].map :capitalize  # => ["Apples", "Oranges",
> "Kiwi"]
> >
> > Still feels like the good old "map" and acts like it...
>
> I know it's sometimes hard to dig up the old RCRs (this one goes back
> two incarnations) but that was rejected; see
> http://oldrcrs.rubypal.com/rejected.html#rcr50.
>
> The discussion for that RCR included:
>
>    * the suggestion of map(&:meth)
>    * using "apply" instead of "map" as the name
>    * rejection by Matz :-)
>
> The reason for rejection was: "It's too functional so that I'm afraid
> it would not work well with OO nature of Ruby. Maybe it's matter of
> notation."
>
> Ruby 1.9 has the map(&:meth) notation.  I'm not its biggest fan
> (mostly on aesthetic/visual grounds), but it has the advantage of
> being more generalized.  & invokes to_proc on its operand; and to_proc
> for symbols is defined as:
>
>    lambda {|e| e.send(self) }
>
> There's a lot you have to "just know" to grasp what map(&:meth) is
> doing, but basically it does this same thing of distributing a
> symbolically-identified method across an enumerable.
>
>
> 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)
>
>
Matz, David

I knew about the &: kludge - I really hate it - but I did not know about the
rejected RCR.
That's why I asked ;)
ty for your time I will not file a RCR of course :(

Concerning the old RCRs that are not part of the new site (there are only
two RCR if I am not mistaken) is there any way to put them?
Can I help?

Cheers
Robert

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

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