#!/usr/bin/ruby

module Enumerable
  def map_with_indices
    a = [] # should this be self.class.new ?
    each_with_index { |o, i| a << yield(o, i) }
    a
  end

  # for those unfamiliar with the nuances of the english language
  alias_method :map_with_indexes, :map_with_indices
end

if __FILE__ == $0
  # test arrays
  a = [1, 1, 2, 3, 5, 8, 13, 21]
  puts 'a:', a,
       'a.map_with_indices:', a.map_with_indices { |o, i| o + i }
end