ruby array extension that combines ActiveSupport in_groups_of + each_with_index

in_groups_of_with_index.rb

class Array
  # [1,2,3,4,5,6,7,8].in_groups_of_with_index(3, false) do |group, index|
  #    puts group.to_s + " " + index.to_s
  # end  
  # [1, 2, 3] 0
  # [4, 5, 6] 1
  # [7, 8] 2
  # => [[1, 2, 3], [4, 5, 6], [7, 8]]
  #
  # [1,2,3,4,5,6,7,8].in_groups_of_with_index(3, "x") do |group, index|
  #   puts group.to_s + " " + index.to_s
  # end
  # [1, 2, 3] 0
  # [4, 5, 6] 1
  # [7, 8, "x"] 2
  # => [[1, 2, 3], [4, 5, 6], [7, 8, "x"]]
  def in_groups_of_with_index(number, fill_with = nil)  
    i = 0    
    in_groups_of(number, fill_with).each do |group|
      yield group, i
      i = i + 1        
    end    
  end    
end