Add deep_find ability to Enumerable to recursively search for a Hash key. Returns the first key found.

enumerable-deep_find.rb

module Enumerable
  def deep_find(key)
    if respond_to?(:key?) && key?(key)
      self[key]
    else
      found = nil
      find { |*a| v = a.last; found = v.is_a?(Enumerable) ? v.deep_find(key) : nil }
      found
    end
  end
end