#!/usr/bin/ruby

# Sum the values of an array of arrays and numerics
#
# Sample Usage:
# > arr = [1, 5 ,3 , [[], 4 , 1, 9, 0], 1]
# > mixed_type_sum(arr)
# => 24

def mixed_type_sum(obj)

  return obj.inject(0){ | total, x |

    total += (x.respond_to? :each) ? mixed_type_sum(x) : x
  }

end