parse_array.rb

def parse_array array, result=[]
  return result if array == []
  obj = array.shift
  if obj.is_a?(Array)
    obj = parse_array obj
    parse_array array, result + obj
  else
    parse_array array, result << obj
  end
end

require 'minitest/autorun'
describe '#parse_array' do
  it "will parse the array" do
    parse_array([1,[2,3],[4,5,[6,7]]]).must_equal [1, 2, 3, 4, 5, 6, 7]
  end
end