gistfile1.txt

# An example of inject: deep_const_get.
# This versions of const_get works with nested constants
# (unlike regular const_get, which chokes on "::").
#
# This implementation does some output along the way to
# show you what's happening.

class Module
  def deep_const_get(const)
    segments = const.split("::")
    segments.inject(self) do |acc, current|
      puts "About to resolve #{current} on #{acc}"
      acc.const_get(current)
    end
  end
end

class A
  module B
    class C
      module D
      end
    end
  end
end

result = A.deep_const_get("B::C::D")
puts "Got #{result}"