gistfile1.txt

module Enumerable
  def inject_with_index(primer = nil)
    each_with_index.inject(primer) do |acc, arr_with_idx|
      yield acc, arr_with_idx[0], arr_with_idx[1]
    end
  end
end 
[:a, :b, :c].inject_with_index({}) {|hsh, sym, idx| hsh.tap {|h| h[sym] = idx}}