Codebytes screening question

gistfile1.txt

# This is a re-implementation of the flatten method for arrays.
# Accepts any number of arbitrarily nested arrays and non-array
# values, flattening them all into a single un-nested array.  The
# output of elements in the array is dependent on the order of input
# elements.

def flatten(*arrs)
  flattened = []

  #outer loop for splat arguments
  arrs.each do |arr|

    #handle non array values
    unless arr.is_a? Array
      flattened << arr 
      next
    end 

    #handle array values
    arr.each do |current|
      rval = flatten(current)
      rval.each {|x| flattened << x}
    end 
  end 

  flattened
end