检查早上或下午是否在红宝石中

Question

如果Time.new是早上和下午，如果下午

，我该如何打印早晨

00:00 - 12:00

12:00 - 00:00

Answer 1

另一种可能性，如果你将经常进行这项测试（不是我主张用一顶帽子修补猴子）：

class Time
  def morning?
    hour < 12
  end
  def afternoon?
    hour >= 12
  end
end

puts Time.now.morning? ? 'morning' : 'afternoon'

Answer 2

这个怎么样：

puts Time.now.hour < 12 ? 'morning' : 'afternoon'

这相当于：

if Time.now.hour < 12
  puts 'morning'
else
  puts 'afternoon'
end

Answer 3

(0..11).include?(Time.now.hour) ? 'morning' : 'afternoon'

Answer 4

def get_time_of_day(hour)
    if (hour >= 5 and hour <= 9)
      return "early_morning"
    elsif (hour > 9 and hour <= 11)
      return "late morning"
    elsif (hour > 11 and hour <= 13)
      return "early afternoon"
    elsif (hour > 13 and hour <= 16)
      return "late afternoon"
    elsif (hour > 16 and hour <= 19)
      return "evening"
    end
end

# example call
get_time_of_day(DateTime.now.hour)