Ruby version of Jesse's n way merge from Java

gistfile1.rb

def n_way_merge(arrays, chunks, chunk_size, new_array)
  indices = []
  (0..chunk_size-1).each_with_index do |n,i|
    min = (1..chunks).select { |j| 
      indices[j] < chunk_size && arrays[chunk_size * j + indices[j]] < arrays[chunk_size * min + indices[min]]
    }.first

    new_array[i] = arrays[chunk_size * min + indices[min]]
    indices[min] += 1
  end
end