Array divide method

# orginal article : http://blog.jayfields.com/2007/09/ruby-arraychunk.html

 

class Array

 

  # divides an array into a smaller chunks

  # [1,2,3,4].divide_by 2 # => [[1,2],[3,4]]

  def divide_by(number_of_chunks)

    chunks = (1..number_of_chunks).collect { [] }

    self.each_with_index do |item, index|

      chunks[index % number_of_chunks] << item

    end

    chunks

  end

 

  alias / divide_by

 

end