Swift CustomStringConvertible

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自定义输出，必须遵循 CustomStringConvertible 协议，实现 description 方法：

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class Person: CustomStringConvertible  {
  var name: String
  var age: Int

  init(name:String, age:Int) {
    self.name = name
    self.age = age
  }
  var description: String{
    return name + String(age)
  }
}

let person = Person(name: "JY", age: 25)
print(person)