例A

if customer.jobs.present? && customer.jobs.last.date.present? && (Date.today - customer.jobs.last.date) <= 90
  puts 'Customer had a job recently'
end

线长太长.难以阅读.

例B

if customer.jobs.present? &&
   customer.jobs.last.date.present? &&
   (Date.today - customer.jobs.last.date) <= 90
  puts 'Customer had a job recently'
end

条件何处结束以及内部代码从何处开始.根据必须Ruby样式指南,你有一个额外的缩进空间用于多行条件,但我仍然觉得它不容易阅读.

例C

if customer.jobs.present? &&
   customer.jobs.last.date.present? &&
   (Date.today - customer.jobs.last.date) <= 90
then
  puts 'Customer had a job recently'
end

对我来说,示例C是目前最清楚的.而那就是利用当时的伎俩.