处理“不可能进行智能转换"的这种情况的最佳方式是在服务器上进行处理. [英] Best way to handle such scenario where "smart cast is imposible"

问题描述

我想知道处理这种情况的最佳方法是什么

I wonder what is the best way to handle such scenario

class Person(var name:String? = null, var age:Int? = null){
    fun test(){
        if(name != null && age != null)
            doSth(name, age) //smart cast imposible
    }

    fun doSth (someValue:String, someValue2:Int){

    }
}

调用doSth方法并确保名称和年龄不为null的最简单方法是什么?

What is the simplest way to call doSth method and making sure that name and age are nt null?

我正在寻找一种简单的方法，例如在一个可变方案中，我会简单地使用let

I am looking for something simple as with one variable scenario where I would simply use let

name?.let{ doSth(it) } 

推荐答案

您可以根据需要随意嵌套let:

You can nest let as much as you like so:

fun test(){
    name?.let { name ->
        age?.let { age ->
            doSth(name, age) //smart cast imposible    
        }
    }
}

另一种可能更容易遵循的方法是使用局部变量:

Another approach, that might be easier to follow, is to use local variables:

fun test(){
    val name = name
    val age = age
    if(name != null && age != null){
        doSth(name, age)
    }
}

最后但并非最不重要的一点，请考虑将Person更改为不变，如下所示:

Last but not least, consider changing Person to be immutable like so:

data class Person(val name:String? = null, val age:Int? = null){
    fun test(){
        if(name != null && age != null){
            doSth(name, age)
        }
    }
    ...
}

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