Kotlin数据类的扩展功能 [英] extension function for Kotlin data class

问题描述

我有一个看起来像这样的数据类

I have a data class which looks something like this

data class SuggestionResponse(
  val metadata: Metadata,
  val response: Response
)

data class Response(
 ///blah blah
)

data class Metadata(
  val timeleft: String,
  val totalTime: String
)

现在我需要将此数据转换为其他类型的数据对象.我想编写一个扩展函数来执行此任务.让函数名称打招呼

Now my requirement to transform this data into a different type of data object.I want to write an extension function to do this task. let the name of function be hello

我想这样称呼这个扩展功能

I would like to call this extension function like this

suggestionResponse.hello()

我如何编写扩展功能?希望得到任何帮助

how do I write the extension function?.any help would be appreciated

推荐答案

只需在SuggestionResponse类上创建扩展功能，您就可以访问SuggestionResponse类的属性:

Just create an extension function on SuggestionResponse class and you'll have access to the properties of SuggestionResponse class:

fun SuggestionResponse.hello() { 
    //`metadata` property is available here
    //`response` property is available here
    val time = metadata.timeleft
}

然后您就可以在SuggestionResponse类的实例上调用它:

And then you'll be able to call it on an instance of SuggestionResponse class:

suggestionResponse.hello()

有关扩展功能的更多信息.

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