sum_of_differences.rb

#!/usr/bin/env ruby

def sum_of_differences(arr)
  total = 0
  arr.each_cons(2) do |x, y|
    total += (x - y).abs
  end
  total
end

puts sum_of_differences [143, 86, 1470, 913, 1774, 948, 1509, 1022, 1750, 130]
puts sum_of_differences [143, 130, 86, 913, 948, 1022, 1470, 1509, 1750, 1774]
puts sum_of_differences [143, 913, 948, 1022, 1470, 1509, 1750, 1774, 130, 86]
puts sum_of_differences [143, 913, 948, 1022, 1470, 1509, 1750, 1774, 86, 130]