Ruby on rails Case when 语句不起作用

Question

我不明白为什么我的 case/when 语句不起作用...我找不到很多关于“AND (&&)”运算符的信息。

points = -180
case points
 when (points >= -9999) && (points < -300) then
    title = "bad player"
 when (points >= -300) && (points < -100) then
    title = "not reliable"
 when (points >= -100) && (points < 100) then
    title = "Newbie"
end

我得到 title = blank..

谢谢

Answer 1

试试这个

points = -180
case
when (points >= -9999) && (points < -300)
  title = "bad player"
when (points >= -300) && (points < -100)
  title = "not reliable"
when (points >= -100) && (points < 100)
  title = "Newbie"
end

#=> "not reliable"

你也可以使用范围

points = -180

title = 
  case points
  when -9999..-301
    "bad player"
  when -300..-99
    "not reliable"
  when -100..99
    "Newbie"
  end


#=> "not reliable"