如何在Ruby中生成成对距离数组？

arr = [1, 3, 5, 7, 9]

pairs = arr.each_cons(2).to_a

distances = pairs.map { |a, b| b - a }

puts distances.inspect

arr = [1, 3, 5, 7, 9]
pairs = arr.each_cons(2).to_a
distances = pairs.map { |a, b| b - a }
puts distances.inspect

[2, 2, 2, 2]