From: Adam Shelly <adam.shelly@...>
Date: 2008-08-09T03:19:34+09:00
Subject: Re: ruby wish-list

On 8/8/08, Mikael Høilund <mikael@hoilund.org> wrote:
> Perhaps a bit controversial, but I'd like to see a keyword for the "current
> block" as a way to refer to the Proc instance created inside that block.
> That would allow for recursive anonymous blocks like:
>
> [[1,2,[3]],[[[5],6],7],8].map { |e|
>  Array === e ? e.map(&current_block) : e.to_s
> }
>

It's not exactly the same, but couldn't you just define a
recursive map function?

class Array
  def map_r &block
    map{|e|Array===e ? e.map_r(&block) : block[e]}
  end
end
p [[1,2,[3]],[[[5],6],7],8].map_r{|e|e.to_s}

=> [["1", "2", ["3"]], [[["5"], "6"], "7"], "8"]