Method to split up / divide an array into other arrays.

array_chunk.rb

class Array
  def chunk(pieces=2)
    len = self.length;
    mid = (len/pieces)
    chunks = []
    start = 0
    1.upto(pieces) do |i|
      last = start+mid
      last = last-1 unless len%pieces >= i
      chunks << self[start..last] || []
      start = last+1
    end
    chunks
  end
end