From: Nikolai Weibull <mailing-lists.ruby-talk@...>
Date: 2005-08-08T04:49:29+09:00
Subject: Re: Adding yet another Array.new form

David A. Black wrote:

> On Sun, 7 Aug 2005, Christian Neukirchen wrote:

> > Nikolai Weibull writes:

> > > Lately I've been using the Kernel.returning method from Rails to
> > > write it as
> > >
> > > def a
> > >   returning ary = [] do
> > >     ... construct ary by adding elements to it ...
> > >   end
> > > end

> > I'd rather vote in favor of including #returning to the Ruby core.
> > It is a very helpful method to DRY.

> It feels a bit side-effect-dependent-ish, as written.  It might be
> nicer with a more traditional yield/block param syntax:
> 
>   returning [] do |ary| ... end
> 
> That shows more of the separation between the fact that you're
> returning an array, and the fact that you're assigning the name ary to
> that array for use inside the block.

True.  It's simple enough to write it that way as well.  In fact,
implementing it as

module Kernel
  def returning(value)
    yield value
    value
  end
end

allows us to write it either way,
        nikolai

-- 
Nikolai Weibull: now available free of charge at http://bitwi.se/!
Born in Chicago, IL USA; currently residing in Gothenburg, Sweden.
main(){printf(&linux["\021%six\012\0"],(linux)["have"]+"fun"-97);}