# encoding: utf-8
x = 55
level = $branches.ifElse { |ifElse|
  ifElse.add(lambda { x >= 90 && x < 100 }) { "优秀" }
  ifElse.add(lambda { x >= 80 && x < 90 }) { "好" }
  ifElse.add(lambda { x >= 70 && x < 80 }) { "良" }
  ifElse.add(lambda { x >= 60 && x < 70 }) { "及格" }
  ifElse.addDefault { "不及格" }
}
$console.log(level)