字串插值

雙引號分隔符 " 和%Q 序列支援使用 #{ruby_expression} 進行字串插值：

puts "Now is #{Time.now}"
# Now is Now is 2016-07-21 12:47:45 +0200

puts %Q(Now is #{Time.now})
# Now is Now is 2016-07-21 12:47:45 +0200