From: Guido De Rosa <guidoderosa@...>
Date: 2010-10-06T23:43:46+09:00
Subject: "map" a deeply nested structure: Object#deep_map

Hi,

most of you probably know/use Ruby Facets

http://rubyworks.github.com/facets/

I've recently posted a question on Facets discussion group:

http://groups.google.com/group/facets-universal/browse_thread/thread/683215a35f06af36

and I also tried my implementation (which apparently works fine):

http://snurl.com/19n6qh

    class Object

      def deep_map(&block)
        if self.respond_to? :each_pair
          out = {}
          self.each_pair do |k, v|
            out[k] = v.deep_map(&block)
          end
          return out
        elsif self.respond_to? :each
          out = []
          self.each do |x|
            out << x.deep_map(&block)
          end
          return out
        else
          return block.call(self)
        end
      end

    end


Is there room for improvements? Facets author suggested to start a
discussion here too.

So: what is, in your opinion, the best way to map a deeply nested
structure made up of Arrays, Hashes, Array of Hashes etc. etc. ?

Thanks,
Guido
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