From: Dan Doel <djd15@...>
Date: 2004-04-09T11:01:39+09:00
Subject: Re: new method(?) collect_by

Interesting.  I don't think I've ever seen that before.

If you find that useful, perhaps you'll find the following interesting:

class Object
  def inject_by(init, method, *args, &blk)
    a = init	
    send(method, *args) do |*o|
      a = yield a, o
    end	
    a
  end

  def collect_by(method, *args, &blk)
    inject_by([], method, *args) do |a, o|
      a << if blk
              blk.call *o
           else
              o.size > 1 ? o : o[0]
           end
    end
  end
end

My #collect_by and yours does the same thing, plus I made the even more
general #inject_by. :)

I don't know where I'd ever use this, but who knows?

Cheers.

- Dan